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Open Access Article
1 - The Methodology of Risk Management Model Within Crisis Management of Municipal Area (the case study:evaluation of semi_quantitive Risk and Radar model in determination of risk earthquake amounts,in Tehran 13th municipality)
اردشیر سیاح مفضلی ندیمه صحفیIn this research, primarily, the concept and process of Risk Management is represented,then evaluation of semi_quantitive of earthquake dangers are determined by methodology of Risk Management. Findings of this case study (Tehran, 13th municipality) are revealed in fra MoreIn this research, primarily, the concept and process of Risk Management is represented,then evaluation of semi_quantitive of earthquake dangers are determined by methodology of Risk Management. Findings of this case study (Tehran, 13th municipality) are revealed in frame of Radar Model.In conclusion, the circumstances of Risk Management danger is also brought out. Manuscript profile -
Open Access Article
2 - Imprecise Data Envelopment Analysis (IDEA) and its use in evaluating the performance of organizations based on the EFQM model
Ali Soltani -
Open Access Article
3 - Design of a Two-Element Antenna with a Fan Beam Pattern for Use in Telecommunication Systems
Seyed Hojat Ollah Madani Yashar Zehforoosh Tohid SedghiIn this paper, an attempt is made to design an antenna to be used in different radar and telecommunication applications. Paying attention to antenna radiation is on the agenda And studies have been done on antenna radiation as well as their radiation pattern.Considering MoreIn this paper, an attempt is made to design an antenna to be used in different radar and telecommunication applications. Paying attention to antenna radiation is on the agenda And studies have been done on antenna radiation as well as their radiation pattern.Considering that the feature of the pattern with the vane feature is used in antennas with radar applications, it is also used in various telecommunication applications. In this article, an attempt has been made to increase the antenna's fan beam properties The designed antenna has two radiation elements And in the 3.5 GHz frequency band, it consists of a two-layer structure. The radiation elements are placed in the upper layer and the feeding network is located in the lower layer. The built dual antenna has an impedance bandwidth of 3.8-3.4 GHz.The maximum gain Hz is 6/76 dBi and the half power beam width is 44˚ and 104˚ in H- and E- planes.respectively which shows that this is fan beam antenna. The overall dimensions of the antenna are 105 × 32/3 ×3/708 mm square. The provided antenna is recommended for use in radar systems and 5G systems in the 3/5 GHz frequency band. According to the laboratory test of this antenna, it can be said that the theoretical and practicical results are in good agreement... Manuscript profile -
Open Access Article
4 - Analysis of the effect of platform motion on artificial aperture radar images
Arezo Alimadadi haghighi Sadegh SamadiArtificial Aperture Radar (SAR) is a remote sensing system used to capture high-resolution images. This radar is installed on a platform (aircraft or satellite). Ideally, the platform is assumed to be moving at a constant speed along a straight path, while atmospheric d MoreArtificial Aperture Radar (SAR) is a remote sensing system used to capture high-resolution images. This radar is installed on a platform (aircraft or satellite). Ideally, the platform is assumed to be moving at a constant speed along a straight path, while atmospheric disturbances and aircraft maneuvers, and other factors cause the platform to change in direct velocity and deviate from the nominal path, and a fuzzy error occurs in the received echo. As a result, there will be distortions in the final image. In this article, we will analyze the effects of platform motion on the artificial aperture radar image and the need to compensate for motion errors. Manuscript profile -
Open Access Article
5 - Analysis and Evaluation of Increasing the Throughput of Processors by Eliminating the Lobe’s Disorder
Saeed Talati Seyed Morteza Ghazali MohammadReza Hassani Ahangar Seyed Mohammad Alavi -
Open Access Article
6 - Point Target Localization and Imaging with Plane Wave using SAR
Hajar Abedi Bijan Zakeri -
Open Access Article
7 - A Thorough Analysis of Wire Bow-Tie Antenna
Parisa Fallah Bijan Zakeri Amirashkan Darvish -
Open Access Article
8 - Combining Principal Component Analysis Methods and Self-Organized and Vector Learning Neural Networks for Radar Data
Saeed Talati Mohammad Reza Hassani Ahangar -
Open Access Article
9 - Find the Best Answer in the Conflict Scenario of Fighters with Electronic Warfare and a set of Defense Radars without Having Complete Information from Each other
Houman Akbarzade KhoshkeRood Seyed Mohammad Alavi -
Open Access Article
10 - The Game Theory Modeling of the Conflict between the Jammer Set, and the ARM Missile with the Search Radar Set and the Missile Equipped with HOJ to Find the Best Response of the Parties
Houman Akbarzade Seyed Mohammad Alavi Yaser Norouzi -
Open Access Article
11 - Distinction of Target and Chaff Signals by Suggesting the Optimal Waveform in Cognitive Radar using Artificial Neural Network
Seyed Mohammad Mahdi Ziaei Pouriya Etezadifar Yaser Norouzi Nadali Zarei -
Open Access Article
12 - Comparative study of the possibility estimation of some structural quantitative attributes of Caspian forests using Radar and integrating Radar and Lidar data
Mehrsa Yazdani Shaban Shataee Joibari Jahangir Mohammadi Yaser MaghsoudiThe purpose of this study was to compare the estimation of the structural attributes of stand volume, basal area, and tree stem density per hectare of the Caspian forests using Radar data and integration of Radar and Lidar data in some parts of the district I and II the MoreThe purpose of this study was to compare the estimation of the structural attributes of stand volume, basal area, and tree stem density per hectare of the Caspian forests using Radar data and integration of Radar and Lidar data in some parts of the district I and II the ShastKalateh forest in the Golestan province. Forest structural data were measured and computed from 307 circular plots. The required pre-processing and processing was performed using raw data of Radar (2009) and Lidar (2011), and the corresponding values of sample plots were extracted on all Radar and Lidar derived indices. The modeling was performed using extracted Radar features as individual and also using Lidar and Radar extracted features as integrated with the non-parametric random forest algorithm in 75% of samples. The modeling validity was performed using 25% of the remained samples by absolute and relative root mean square error (RMSe) and Bias. The percentage RMSe and the Bias values using Radar data were obtained form stand volume (44.09% and -0.99%), basal area per hectare (35.72% and -3.15%) and tree stem density per hectare (42.73% and 3.52%), respectively, and using the integration of Radar and Lidar data for stand volume (37.23% and 0.76%), basal area per hectare (31.37% and -3.14%), and tree density per hectare (36.44% and 0.95%). The results showed that the integration of Radar and Lidar data could improve the estimates, especially in the stand volume, compared to using Radar data as individually. Manuscript profile -
Open Access Article
13 - Comparison of optic and radar data for terrain feature extraction
Mohammad Maleki Seyed Mohammad Tavakkoli Sabour Parviz Zeaieanfirouzabadi Majid RaeisiThe availability of suitable maps of terrain features is very important because these complications and the process governing them are the sources of many environmental hazards and resources. The purpose of this research, compare the optic and radar data for terrain fea MoreThe availability of suitable maps of terrain features is very important because these complications and the process governing them are the sources of many environmental hazards and resources. The purpose of this research, compare the optic and radar data for terrain feature extraction. A panchromatic band of Landsat 8 (OLI) as an optical image and two C-band Sentinel-1 satellite radar images with a resolution of 22×20 m per pixel were used. Two radar images (radar-1 and 2) in two different acquisition directions with different look angels were visually interpreted. In order to reduce the geometric and radiometric effects of the topography, the radar images were corrected using 3-second SRTM data (modified radar). In this study, four feature types were extracted by visual interpretation, which is: valleys, blades, alluvial fans, and debris fans and the results were compared with the World Imagery layer. The accuracy, completeness, quality, kappa, and z-test were calculated for every interpretation. The results showed that the highest accuracies in recognition of valleys and blades using Landsat image were 83.90% and 87.88%, respectively, and the highest accuracies of alluvial fan and the debris fan of the modified radar image were 82.76% and 83.72% respectively. The highest kappa coefficient related to the modified radar data was calculated at 54.72% (Landsat 49.74%) and the highest z-text related to Landsat-radar 1 was calculated 0.9871 (Modified Radar-Landsat 0.6443%). Manuscript profile -
Open Access Article
14 - Identification of the new and active buried salt dome evidences in the Zagros region using interferometry method of SENTINEL-1 and ASAR radar images
Ali MehrabiSalt domes are one of the most beautiful natural phenomena. Despite the outcrops of many salt domes in the Zagros region, but many of them are still buried and hidden. Due to active Zagros tectonics, the movement and ascending trend of salt domes do not stop. In this re MoreSalt domes are one of the most beautiful natural phenomena. Despite the outcrops of many salt domes in the Zagros region, but many of them are still buried and hidden. Due to active Zagros tectonics, the movement and ascending trend of salt domes do not stop. In this research, with the aim of the changes monitoring in the Earth's crust in the Zagros area, one of the new, hidden and ascending probabilistic salt domes, was identified using a radar interferometry method. For this purpose, ASAR radar images for the years 2007 and 2012 and SENTINEL-1 for the years 2014 and 2017 were used. In order to determine the amount of changes in the earth's crust, during the process of unwrapping on the images, the interference of each of the images was extracted. According to the results of the analysis of ASAR images, the growth rate of the salt dome was 1.6 centimeters per year between 2007 and 2012. While according to the interferometry images that obtained from SENTINEL-1 the rising speed of this salt dome increased between 2014 and 2017, reaching 2.9 centimeters per year. The result of this study shows that the probabilistic salt dome is active. Consequently, due to the importance of salt domes in various fields of natural resources, especially in the formation of oil reservoirs in the Zagros region, as well as more accurate identification of the subject, it is necessary to carry out special geophysical studies in this area. Manuscript profile -
Open Access Article
15 - Geospatial modeling of land subsidence in the south of the Minab watershed using remote sensing and GIS
Abdolkhalegh Arvin Ghorban Vahabzadeh Seyed Ramazan Mousavi Masoud Bakhtyari KiaMinab plain in Hormozgan province has experienced population growth with agricultural development in recent decades. Low rainfall in recent years, successive droughts, and limited surface water resources, irregular irrigation practices in the agricultural sector in the MoreMinab plain in Hormozgan province has experienced population growth with agricultural development in recent decades. Low rainfall in recent years, successive droughts, and limited surface water resources, irregular irrigation practices in the agricultural sector in the study area, along with inappropriate cultivation patterns, have caused the extraction of water wells in the region. The extraction of these wells and groundwater resources has led to an imbalance in the aquifer in the area and a decline in groundwater levels. The consequences of this trend have caused the creation and expansion of subsidence in the region. This research, by investigating radar, satellite images and using differential radial interferometry, has been used to detect and determine the amount of subsidence in order to investigate the extent of this phenomenon in the study area. In this study, data from the Sentinel-1 refer to the dates 2014 and 2018 were used. The results showed it had 13-centimeter subsidence in the study period. After verifying the results by control points (in September 2018), in order to find the relationship of subsidence with changes in groundwater level, elevation, and slope, a spatial analysis was performed and the correlation of each of these factors with subsidence event density was calculated. Spatial autocorrelation analysis and Moran's index showed that climatic event due to water level changes in the study area was 0.925. The values of 1.89 and 0.06 for standard normal distribution (z) and the p_value respectively, confirm a strong autocorrelation between the studied factors. Manuscript profile -
Open Access Article
16 - Investigation of ground subsidence rate using radar interferometry (D-InSAR) In Nabahband – Sahelabad Plain
samad fotoohi sayed ali almodaresi roghaiyeh delaramAbstractLand subsidence occur due to the natural and human activities. One of the main causes of subsidence is the excessive usage of groundwater resources. In the study area, due to the dry and desert area, low rainfall and lack of permanent rivers, the most use of gro MoreAbstractLand subsidence occur due to the natural and human activities. One of the main causes of subsidence is the excessive usage of groundwater resources. In the study area, due to the dry and desert area, low rainfall and lack of permanent rivers, the most use of groundwater resources is that in this area we see many wells for agricultural use. Various types of deformation surveying technique have been used widely to measure the land subsidence pattern.This research is based on radar remote sensing method and field study. First, satellite data and images were examined and processed using the remote sensing method. To investigate the temperature, the radar interference technique was used to process the radar images at specific intervals. The images used relate to the ASAR Envisat satellite in the C band from 2003 to 2010 and the pair of images of the Sentinel 1 satellite in the C band from 2019 to 2020. The results of this technique show that the highest amount of subsidence related to the agricultural lands in the center and north of the plain is about 13.4 cm in the period 2007 to 2010 and also in the period 2007 to 2008 about 13.1 cm. We see the subsidence meter. In the new study of Sentinel1 satellite images in the period 2019 to 2020, this area has also experienced a subsidence of 5.9 cm, which indicates the continuation of subsidence in this region. To verify the results, statistics related to piezometer wells were used and the results show a decrease in groundwater level in the study area in the period 2007 to 2010. Manuscript profile -
Open Access Article
17 - Ground-displacement monitoring and geomorphological effects analysis using remote sensing data
ALI Abdolmaleki Amjad Maleki Ali KhazaiBackground and Objective An earthquake is one of the most important natural events that cause a lot of financial and human losses every year around the world. An earthquake is an earthquake caused by the rapid release of energy, which often occurs due to landslides alon MoreBackground and Objective An earthquake is one of the most important natural events that cause a lot of financial and human losses every year around the world. An earthquake is an earthquake caused by the rapid release of energy, which often occurs due to landslides along a fault in the earth's crust. Earthquakes cause many geological-geotechnical instabilities such as multiple rockfalls, soil and rock landslides, runoff and mud flow, subsidence limestone caves, liquefaction, and expansion rupture. One of the most important effects of an earthquake is the displacement of the earth and the resulting morphological changes. Estimating the rate of land displacement and monitoring the morphological changes of this phenomenon in order to manage the crisis is one of the basic measures after the earthquake. In recent decades, extensive efforts have been made to monitor changes and displacements of the Earth's crust. With accurate alignment and ground observations, changes can be measured with great accuracy, which ground measurements are costly and can be measured sporadically. The use of remote sensing technology in the various earth sciences is very common due to the wide coverage of satellite images, the timeliness of the images, and its low cost compared to terrestrial methods. One of the applications of measurement is to show and control the movements of the earth's crust due to factors such as earthquake, drift, subsidence. The use of radar, satellite images, and radar interferometry methods, due to extensive coverage and periodic imaging and with an accuracy of about cm, is a good tool to monitor changes in the Earth's crust. Satellite imagery of the Sentinel-1 satellite system, which has been made available to the public free of charge by the European Space Agency since 2014 and is currently being continuously imaged, is a good tool for earthquake monitoring. A radar imaging technique is a new tool used for the discovery and display of land subsidence. In the present perusal, in order to achieve the above purpose, using satellite data and radar interferometry technique, the deformation of the earth's crust due to post-seismic movements in Sarpolzahab city has been investigated. Materials and Methods In this paper, using radar imagery, the deformation field due to the seismic dimension of the county is obtained from 11/ 11/ 2017 to 17/11/2017 using radar data (S _ 1 A - IW), with a baseline of 100 m.Results and Discussion Examination of the results of deformation of the earth's crust after an earthquake shows; The highest rate of land subsidence in the north, northwest of Sarpol-e-Zahab city (about 90 cm vertical displacements of the earth's crust) to the west, and land elevation around the epicenter (north of the herd), about 30 cm vertical displacements of the earth's crust (towards Darbandi Khan) It has happened. The effects of subsidence and uplift caused by the earthquake in the study area in addition to morphological changes in the area have also affected the hydrology of water resources in the area. For example, earthquakes have caused significant changes in the volume of water in the Strait of Hammam dam and increased the volume of water resources in the Sirvan river.Conclusion The results of this study showed that the use of radar interferometry technique, in addition to being an efficient tool in estimating the rate of crustal displacement, can be used in relatively accurate estimation of quantitative changes in water resources resulting from crustal displacement. Manuscript profile -
Open Access Article
18 - Geochemistry of the Paleocene Sediments from SW Ahar: Implications for Provenance, Tectonics and Source Rock Weathering
Nasser Ashrafi Behzad HajalilouThe mineralogy and geochemistry of Paleocene shales and interbedded siltstones in the southwestern of Ahar town (NW Iran) were studied by optical microscopy, XRD, SEM, XRF, and ICP-MS techniques. The mineralogical composition, mainly characterized by calcite, quartz, fe MoreThe mineralogy and geochemistry of Paleocene shales and interbedded siltstones in the southwestern of Ahar town (NW Iran) were studied by optical microscopy, XRD, SEM, XRF, and ICP-MS techniques. The mineralogical composition, mainly characterized by calcite, quartz, feldspar, dolomite, muscovite, magnesiohornblende, chlorite, illite, montmorionite, palygorskite, and koninckite, suggests relatively fast erosion of the parent rocks and incipient metamorphism for the studied sediments. The values of weathering indices and the Index of Compositional Variability, as well the mineralogy of the sediments imply moderate weathering in the parent rocks and deposition as first cycle sediments. The shales exhibit higher Al2O3/TiO2 (≈21), La/Sc, and Th/Cr values corresponding to felsic and/or intermediate source rocks. The geochemical character of sediments including ∑REE=116 ppm, (La/Yb)N=8.3, (Eu/Eu)=0.78, and the immobile elemental ratios values suggest an immature continental arc setting. The typical shale and chondrite normalized REE patterns of the shales are comparable with continental arc terrigenous sediments and Andean-type andesites. The inferred tectonic setting for the studied shale is in agreement with the tectonic evolutionary history of NW Iran during the Upper Cretaceous-Upper Paleocene. According to the present data, we conclude that the ultimate provenance of the studied shale and its interbedded siltstone and thin detritic limestone was probably the Upper Cretaceous sediments with the geoenvironment of acidic to intermediate volcanic rocks and marl. Manuscript profile -
Open Access Article
19 - A Study of Bio ecological and land cover change of Northern Lands of Khuzestan by Remote Sensing
Hamed Piri babak maghsoudi sara shirzadMany varied attitudes exists about how the changes occur in the land-surface from the time William Davis’s researches to the latest researchers in the history of geomorphologic philosophy, and many different terms are used by scientists in order to observe their i MoreMany varied attitudes exists about how the changes occur in the land-surface from the time William Davis’s researches to the latest researchers in the history of geomorphologic philosophy, and many different terms are used by scientists in order to observe their ideas related to geomorphic phenomena. The phenomenon of duality has been less seen in the geomorphology field. There exist some contradictory phenomena in nature, but further investigation can show their correlation clearly. Durability can be considered as a better dynamic entropy. In this research, radar interferometry technique has been used in Yazd-Bahadoran area, as well as through field and library studies, the amount of subsidence and uplifting has been investigated and the results have been compared with the other researchers' studies, which is a new concept in the literature of geomorphology under geo-duality. The study results indicate that the main reason for the subsidence was not to cut down the level of groundwater, and in this regard the tectonic movements play a significant role. Also, the study shows a significant relationship between subsidence in the Bahadoran plain and the collapse in adjacent heights in terms of duality or dichotomy. Manuscript profile -
Open Access Article
20 - Investigating the role of duality in geomorphology using radar data in Bahadoran plain of Yazd
Hamed Piri Abolqasem Amir Ahmadi Hamed AdabMany varied attitudes exist about how the changes occur in the land-surface from thetime of William Davis’s research to the latest researchers in the history ofgeomorphologic philosophy and many different terms are used by scientists in order toobserve their ideas MoreMany varied attitudes exist about how the changes occur in the land-surface from thetime of William Davis’s research to the latest researchers in the history ofgeomorphologic philosophy and many different terms are used by scientists in order toobserve their ideas related to geomorphic phenomena. The phenomenon of duality hasbeen seen less in the geomorphology field. There exist some contradictory phenomenain nature, but further investigation can show their correlation clearly. Durability can beconsidered as a better dynamic entropy. In this research, radar interferometrytechnique has been used in Yazd-Bahadoran area and the amount of subsidence anduplifting has been investigated Through field and library studies and the results havebeen compared with the other researchers' studies, which is a new concept in theliterature of geomorphology under geo-duality. The study results indicate that the mainreason for the subsidence was not to cut down the level of groundwater, and in thisregard the tectonic movements play a significant role. Also, the study shows asignificant relationship between subsidence in the Bahadoran plain and the collapse inadjacent heights in terms of duality or dichotomy. Manuscript profile -
Open Access Article
21 - Geotectonic Critical Analysis with Emphasis on Active Remote Sensing (ASAR Sensor) Case study: Persepolis
Asghar DaneshmandiThe main reason for subsidence in Iran is the large amount of water withdrawn fromunderground resources, which, if not managed properly will cause irreparabledamages. To deal with such a problem, it is necessary to identify the subsidence areas.Most country's ancient ar MoreThe main reason for subsidence in Iran is the large amount of water withdrawn fromunderground resources, which, if not managed properly will cause irreparabledamages. To deal with such a problem, it is necessary to identify the subsidence areas.Most country's ancient artifacts have been built on fertile plains, and due to the drynessof the past decade, and the abundance of groundwater from the subsidence, itaccelerates the destruction of ancient works in these areas. In this research, the area ofPersepolis, which is 57 km northeast of Shiraz and 10 km north of Marvdasht city, isbased on the level of the land subsidence using differential radar interferometrytechnique. Using Eoli-SA 9.4.3 software, two images were taken from the ASVARdata series of the ENVISAT satellite. The data processing with SARSCAPE 4.3software, a radar differential interference method, has been implemented at twodifferent times in a region. A new image called an interferogram or interferometer wasprovided that contains the target geophysical information. Therefore, the amount ofsubsidence or uplift was determined in the three interlaced states. During the researchperiod from 23/12/2004 to 17/12/2009, which is 1820 days, it has been clear that theancient area of Persepolis, the historic city of the pool and the role of Rustam betweentwo and three centimeters subsided, and the role of Rajab is also between the four hasseen up to five centimeters of subsidence. Manuscript profile -
Open Access Article
22 - Quantifying Geotechnical Changes in the Rafsanjan Plain in Time Series and Finding Out Their Causes Using Radar Remote Sensing Techniques
jalal hassanshahiSubsidence is the earth’s surface movement towards down relative to a datum such as sea level. The main reason of subsidence in Iran is groundwater overuse which if not managed correctly, it causes irreparable damages. Therefore, the first step in solving this pro MoreSubsidence is the earth’s surface movement towards down relative to a datum such as sea level. The main reason of subsidence in Iran is groundwater overuse which if not managed correctly, it causes irreparable damages. Therefore, the first step in solving this problem is identification of subsidence areas and estimating the rate which will have a significant role in controlling this phenomenon. One of the most suitable methods of identification of subsidence is using Interferometric Synthetic Aperture Radar (InSAR)technique. This method is superior to other detection T in terms of cost, precision, extent of the study area and time and it can provide an accurate estimate of the area. In this research, zone of the Rafsanjan plain has been investigated between 2006 and 2010. In order to calculate subsidence rate, SAR data related to the ASAR sensor in C-band and ALOS PALSAR in L-band were used. Generalized linear models in C-band and L-band with values of 0.91 and 0.89 and RMSE coefficient of 0.37 and 0.61 represented a strong linear relationship. Also the relationship between subsidence and the changes inpiezometric levels (groundwater extraction) in the study area showed that for each 4.7 centimeters groundwater level decrease, there has been 1 centimeter subsidence. Manuscript profile -
Open Access Article
23 - Investigation of land Subsidence in Orzuiyeh Plain of Kerman Using Radar Differential Interference Method (DINSAR)
Mahdi Emambakhsh Karim NaghdiThe Phenomenon of subsidence of the earth occures causing wide–raging problems and dangers. The occurrence of this phenomenon causes problems for farmers, the destruction of communication lines and infrastructures and some other issues. In this research from diffe MoreThe Phenomenon of subsidence of the earth occures causing wide–raging problems and dangers. The occurrence of this phenomenon causes problems for farmers, the destruction of communication lines and infrastructures and some other issues. In this research from differential interference (DINSAR) and using ASAR sensor data from 2009 to 2010 and sensors sentinel 1 in 2014 – 2015 in relation to the Kerman's Orzuiyeh plain, it is tried to depict the phenomenon of desertification in the picture of the Kerman valley. temporal and spatial Changes have been made in this plain. seascape software is used to process image The results of the series analysis the time has come to show that the region is continuously subsiding; the amount of subsidence per year 2008 to 2009 is 15 centimeters, the most abandoned in the northwest and central plain and 2009 year by 9, 100 cm by 2010, which is still the high et amount of subsidence in the northwest and central plain and for the year 2014 to 2015 is 8.2 cm and the largest amount of this phenomenon is in the southeast part of the Orzuiyeh plain. looking at the pictures of the subsidence of these years can be concluded that Orzuiyeh's desertification is dynamic and has a trend from the north the west was southeast of the plain. Manuscript profile -
Open Access Article
24 - Investigation of Active Geodynamics Caused by Performance of Salt Dome Using Radar Interferometry (Case Study: The Salt Dome of Qeshm Island)
Leilaa hajiesmaeli kourosh RashidiQeshm salt dome is a part of Qeshm unique Geopark, the only Geopark in the Middle East. The present study is a descriptive-analytical. Qeshm Salt Dome study area and required information for this research are radar satellite images, optical satellite images as well as r MoreQeshm salt dome is a part of Qeshm unique Geopark, the only Geopark in the Middle East. The present study is a descriptive-analytical. Qeshm Salt Dome study area and required information for this research are radar satellite images, optical satellite images as well as rock, geological information of the area using radar interferometry and paired radar images taken from the site. The European Space Agency is first developing some ground-level models for the region by doing some processing. After constructing the elevation model, the Envi software performs several measurements on the ASAR satellite Envisat satellite radar data and performs interpolation to calculate the elevation of Qeshm Island and presents the results digitally. An adaptive filter was used to provide better results. Rate of salt dome changes in the period 2003-2005, 0 to 0.16 m, in the period 2005-2008, -0.03 to 0.085 m and in the period 2008 to 2010, -0.007 to 0.082 m was calculated. Rate of changes in Qeshm Island in the period 2005-2003, 0 to 0.23 m, in the period 2008-2005, -0.2 to 0.15 m and in the period 2010-2008, were -0.03 to 0.23 centimeter Manuscript profile -
Open Access Article
25 - The Role of Anthropogenic Effects In Subsidence Of Normanshir-Fahraj Plain
Samad Fotoohi Hossein Negaresh Roghayeh Delaram Masoud Sistani Badooei The role of humans in anthropogenic erosion and geomorphological changes of its natural environment is very important. Its most important role in recent decades is the use of surface and groundwater resources, which has been clearly shown as the destructive effect More The role of humans in anthropogenic erosion and geomorphological changes of its natural environment is very important. Its most important role in recent decades is the use of surface and groundwater resources, which has been clearly shown as the destructive effects of excessive use of groundwater. Therefore, the need for water resources has caused the withdrawal of these very valuable resources from the underground aquifers of the country, whether allowed or not, and is facing the risk of land subsidence. The construction of the dam was another destructive effect that played an important role in blocking the aquifer nutrition. Narmashir-Fahraj plain is one of the plains in the country which has been directly affected by dam construction and uncontrolled abstraction of groundwater. After the dewatering of Nesa Dam, we were witnessed many environmental and water crises downstream of the alluvial fans of Fahraj and Normanshir.The need for drinking water, irrigation of date orchards and other uses has led to high groundwater abstraction. Also the subsidence is calculated using radar data Sentinel 1 satellite for 6 months about 10 cm, which is high. Therefore, it is necessary to pay attention to landslide risk management as well as to avoid secondary hazards such as the destruction of walls and buildings, road lines and the transfer of energy and infrastructure by the relevant governorate. Manuscript profile -
Open Access Article
26 - Velocity Estimation of Moving Target by GB-SAR Sensor Using MIMO Antennas
Negar Zahedi Jalal Amini Many researchers and users have drawn their attention to the radars with Multiple Input-Multiple Output (MIMO) antennas in recent years. The reason is the capabilities that these systems provide to the users, including its low cost, the similarity of the output of More Many researchers and users have drawn their attention to the radars with Multiple Input-Multiple Output (MIMO) antennas in recent years. The reason is the capabilities that these systems provide to the users, including its low cost, the similarity of the output of MIMO antenna arrays compared to conventional systems with similar characteristics, and its strength. One of the applications of this system in Radar Remote Sensing is identifying the objects and their movement speed. This article’s primary purpose is to identify the moving object and determine its speed by Doppler processing and Fourier transform. For this purpose, firstly general topics related to MIMO systems are mentioned, and then available explanations on how to identify the moving objects are provided. Finally, the characteristics of the sensor used in the laboratory and the results of two different simulations in a software environment are presented. The first simulation is to determine the proper angle of transmission of waves to the object, and the second simulation is to identify two moving objects in two different modes: 1- moving two objects at different speeds while the sensor is stationary and 2- simultaneous movement of two objects and also moving the sensor at different speeds. Manuscript profile -
Open Access Article
27 - Evaluation of Active Geodynamics via Interfering Techniques in SAR Images (Case Study: Bardsir Plain)
Zohreh HamzehIn recent years, it has occurred in different regions of Iran, especially the plains, and in most regions has caused this phenomenon to become a major regional and country crisis. Kerman desert province is no exception to this rule and most of its plains and industrial MoreIn recent years, it has occurred in different regions of Iran, especially the plains, and in most regions has caused this phenomenon to become a major regional and country crisis. Kerman desert province is no exception to this rule and most of its plains and industrial areas have suffered from this phenomenon and have high subsidence rates. The present study investigated the occurrence of this phenomenon using radar interferometry technique and Sentinel 1 satellite images in the period of 2019 and 2020 in Bardsir plain of Kerman province. To investigate the rate of subsidence in the region, initial processing was performed in remote sensing software and GIS and two Goldstein and Adaptive filters were used to evaluate the obtained results. The results show that the Goldstein filter has subsidence values up to 10 cm in certain ranges and the uplift values up to about 6.5 cm and the Adaptive filter have given the subsidence values up to 9 cm in some ranges and the uplift values up to about 5.6 cm. The reason for the difference in values in the results of these two filters is that in the Goldstein filter, the amount of coherence increases by manipulating the phases, so the image is brighter, thus the situation in this filter improves. But this is not the case with the Adaptive filter, and the phases are not manipulated, and in some areas, the amount of blurriness is higher in different parts of the image. Manuscript profile -
Open Access Article
28 - Land Subsidence analysis in the Adjacency of Gas Pipelines Based on Radar Interferometry (A Case Study in Centeral Iran)
Mohammad Tajobian Seyede Razieh KeshavarzThe land subsidence phenomenon as a geomorphic hazard has reached to a critical level in some parts of central Iran recently. The gradual and sudden land subsidence is influenced by natural and artificial parameters. The gradual land subsidence has a slow pace mainly du MoreThe land subsidence phenomenon as a geomorphic hazard has reached to a critical level in some parts of central Iran recently. The gradual and sudden land subsidence is influenced by natural and artificial parameters. The gradual land subsidence has a slow pace mainly due to the overextraction of underground water or oil resources. The continued land subsidence can, in the long period, deliver irreversible damages to buildings, roads, bridges and pipelines. The application of remote sensing technology in earth survey is very common due to the wide coverage of satellite imagery, the timeliness of images and its lower required budgets versus ground-based methods. One of the applications of remote sensing is to control the movement of the ground surface due to various factors such as earthquakes, landslides and land subsidences. In this research, two satellite images of SENTINEL1 from 2015 to 2017 and DEM of the mentioned region have been used. Special software was used for processing images by forming an interferogram and performing filtration, consequently the land subsidence was determined at this time interval. Investigations confirmed that the excessive use of underground water resources has led ro substantial amounts of land subsidence in Yazd province. Interferograms resulting from the processing of radar images showed the occurrence of land subsidence within the neighbourhood of gas distribution and transmission pipelines in specific at an average of 8 to 10 cm around several cities, in specific Ardakan and Meybod Manuscript profile -
Open Access Article
29 - Semi-automatic monitoring in monitoring the privacy of electricity transmission and super distribution lines in Yazd province using time series analysis of radar images, a case study of Jumhouri Blvd
Mahdieh RezaeyanToday, the electricity industry is considered one of the most vital industries of a country, and considering that the passage of electricity transmission lines in each region has different effects and radiation depending on its voltage, so in order to preserve human hea MoreToday, the electricity industry is considered one of the most vital industries of a country, and considering that the passage of electricity transmission lines in each region has different effects and radiation depending on its voltage, so in order to preserve human health, plant growth and prevent financial losses, Privacy must be respected. One of the optimal methods in semi-automatic monitoring and monitoring of illegal constructions is the use of remote sensing and the use of radar images. In this research, Sentinel1 radar time series images were used to monitor the security of transmission and super distribution lines, which after applying pre-processing Necessary in SNAP software, In order to extract the zero sigma dispersion coefficient of the images and make them binary, 100 sample points were taken as a statistical population from the Landsat images and the threshold limit of the construction of two images were calculated and the number 0.081003 was obtained as the threshold limit, and then by creating the privacy layer of the transmission network and overlaying it with the fuzzy images, the amount of interference The constructions were determined by the structure of the network privacy and also the illegal constructions were identified during one year with the pixel-based algorithm and at the end drone images were used for validation, the results of this research indicate that most of the illegal constructions can be identified using the method presented It was identified semi-automatically with 85-90% accuracy and increased the speed of identifying illegal constructions in privacy Manuscript profile -
Open Access Article
30 - Identification of Patriot MIM-104 missile defense systems around Iran by Sentinel-1 radar images
Ahmad Ardakani Mohammad Hossein FathiIran is located in one of the most critical regions of the world called the Middle East. Due to its convenient location and abundant energy reserves, this region has always been of interest to foreign countries, led by the United States. This has led to numerous US inte MoreIran is located in one of the most critical regions of the world called the Middle East. Due to its convenient location and abundant energy reserves, this region has always been of interest to foreign countries, led by the United States. This has led to numerous US interventions and the establishment of numerous military bases around Iran, especially after September 11th incident. Continuous monitoring of these bases and related facilities is one of the most important deterrents that can be done by remote sensing knowledge. One of the remote sensing techniques is the synthetic aperture radar, which has been considered in recent years, while the Sentinel-1 satellite launched in 2014 by the European Space Agency uses the same technique. One of the applications of this satellite, which is introduced in this article, is the detection of Patriot MIM-104 systems. This is done by combining the VV and VH polarizations with two images taken during the satellite's day and night transitions from a single point, which are represented by X-shaped lines where the Patriot systems are located. The images related to this satellite are also processed by Google Earth Engine system, which saves considerable time in analysis and increases the accuracy of the results due to the minimization of human error. The results showed that in the regions around Iran and especially in the Arab countries of the Persian Gulf, there are at least 16 active Patriot systems, which indicates its great development in recent years and shows the need for continuous monitoring of these systems. Manuscript profile -
Open Access Article
31 - Study on Performance Assessment System Based on Automotive Industry Requirement Indices, Using Compilation Model TOPSIS, AHP and RADAR of European Foundation & Quality Management
mohammad taleghani naser hamidi seyed alireza mousavi farEnvironment conditions have placed the large organizations in a situation that some of them should continuously make efforts and compete in order to survive and to keep dominance in industry .So evaluating the indices of suppliers' performance; auto pieces manufacturing MoreEnvironment conditions have placed the large organizations in a situation that some of them should continuously make efforts and compete in order to survive and to keep dominance in industry .So evaluating the indices of suppliers' performance; auto pieces manufacturing organizations can try to increase the customers' satisfaction. The classical models of Supplier's performance evaluation were based on Production Cost control and efficiency. But now, unforeseen changes in business environment and managerial challenges have resulted in intense competition among the companies, entailing the consideration of non-financial indices. Achieving the target industrial indices such as (Process Audit, Product Audit, Time on Delivery, Cost of Quality, Part per Million, Overall Equipment Effectiveness and Measuring Customers Satisfaction) lead to excellence and customers' satisfaction in organizations. Using the above-mentioned indices as well as the scientific data and theoretical studies, this study offers a model integrating decision making model and Radar logic in organization excellence model (EFQM( and ranks of Faravari & Sakht Vehicle part manufacture Company Suppliers accordingly.. Manuscript profile -
Open Access Article
32 - A combined Model design for developing and optimizing product platform architecture considering parameters of DFV, DFC, DFSC, and DFAv, case study: phased array radar
Masoud Merati Mahdi Karbasian Abbas Toloie Ashlaghi Hasan HalehDeveloping a robust platform architecture can give companies a competitive edge and enhance product future generations and customer satisfaction. However, in order to develop a product platform architecture, there is a need for some kind a product variety design that co MoreDeveloping a robust platform architecture can give companies a competitive edge and enhance product future generations and customer satisfaction. However, in order to develop a product platform architecture, there is a need for some kind a product variety design that concurrently manages costs and the supply chain process, and focuses on ease of use and improved availability to components. In this research, the design for variety (DFV) approach and two indices, generational variety index (GVI) and coupling index (CI) are used to measure a product architecture. Using the quality function deployment (QFD) and design structure matrix (DSM), design indices for product diversity are identified and ranked. Additionally, the design for variety approach is modeled simultaneously with the concepts of design for cost (DFC), design for availability (DFAv), and design for supply chain (DFSC) to yield a practical mathematical model for the development of the product platform architecture, which aims for product diversity, improved availability, reduced costs, and supply chain management. The case study of the current research is a phased array radar, which is optimized using the latest techniques (genetic algorithm) and MATLAB software to solve the problem. After implementing the model, considering four objectives including total cost, availability, supplier evaluation score (competency) and replaceability (variety), and seven main parameters of the model, sensitivity analysis and other comparisons and results are presented, which analyzes the relationships between objectives, the impressment and affectability of objectives and model parameters on each other. Regarding the comparison of objectives, the results generally show the inverse relationship between the total cost objective and the other objectives, and the direct relationship between the other objectives with each other. Additionally, the results of the sensitivity analysis performed indicate that the availability objective had the highest effect and replaceability (variety) and the evaluation score of suppliers (competency) and total cost also took next place. Manuscript profile -
Open Access Article
33 - Assessing the performance of education management in Miandoab township based on EFQM in 2011
Sadegh Maleki Avarsin Behnam Talebi Hossein BabazadehThe present study aimed at assessing the performance of education management in the city of Miandoab based on EFQM in 2011. The research method was descriptive survey. The sample size was selected through simple random sampling included 28 people. To test the hypotheses MoreThe present study aimed at assessing the performance of education management in the city of Miandoab based on EFQM in 2011. The research method was descriptive survey. The sample size was selected through simple random sampling included 28 people. To test the hypotheses the t-statistic was used. The main instrument utilized for data collection was a standard questionnaire which has been organized based on (EFQM) model. Each of the sub-criteria included objective examples and guided points, arranged based on the characteristics of education. The sub-criteria posed 264 questions based on RADAR logic. Having participated in a 2-day orientation course, the subjects were given the questions. The performance of the management was assessed through self assessment by the employees. To test the validity of the questions some experts were consulted, and to determine the reliability of the questions Cronbach's alpha was used which was α=0.95. The study consisted of 2 questions. Miandoab's Education Administration gained 506.59 out of 1000 for its performance based on the EFQM. The performance of the administration in empowerment criteria gained 49.83 percent and results criteria 51.48. Accoring to the findings of the study it was suggested to enhance the performance of the organization. The results showed that, the performance of the administration management in Miandoab city based on EFQM model in results criteria was better than empowerment criteria. Manuscript profile -
Open Access Article
34 - Performance Evaluation of educational organization in east Azerbaijan using European foundation quality model (EFQM) in 2007
Sadegh Maleki Alireza RanjbariThe general objective of this paper is to evaluate the performance of education organization in east Azarbijan using EFQM. In this regard, the descriptive – survey method was used. The research population was people76. The sample size using Cochrans formula& MoreThe general objective of this paper is to evaluate the performance of education organization in east Azarbijan using EFQM. In this regard, the descriptive – survey method was used. The research population was people76. The sample size using Cochrans formula was 38 people.An advanced questionnaire was used to measure the variables including nine criteria and thirty-two sub- criteria. Each sub criteria included guide points and evidences which have been regulated according to specifications related education. The total sub criteria questions according to RADAR logic added up to 264. After carring on two days justifying course for employees, these questions were given to them. The performance of education organization was carried out through the sef –evaluation method by the employees of the organization.the validity of the questionnaire was determined by experts. The Cronbach's Alpha was used to calculate the reliability, which was 0.96. In this study nine questions were posed, the scores of performance obtained were 486 out of 1000 based on (EFQM). The percentage of nine sub- sores were: 47% leadership, 44% policy and strategy, 47% staff, 46% recourses and participation, 44% processes, 54% results of the client, 45% results of the staff, 51% results of the society and 47% the key results of performance. Manuscript profile -
Open Access Article
35 - Evaluating the Performance of Management in Engineer Traininig Centers of Iran Based on Fuzzy Approach: A case study
Hassan Khademi Zare Mahnaz zareiOne of the key factors that lead organizations and high education centers to deficieney is that their processes and obtained results are not evaluted well. In the case that high education centers realize their positions well and become aware of their weaknesses, they wi MoreOne of the key factors that lead organizations and high education centers to deficieney is that their processes and obtained results are not evaluted well. In the case that high education centers realize their positions well and become aware of their weaknesses, they will no doubt attempt to eliminate those deficiencies. The purpose of this research, whose implementation scope is one of the technical-engineering complexes, is to present a method for the evalution of the performance of management in engineer training centers based on the European Foundation for Quality Management (EFQM) excellence model. Since the existing decision – making environment of high education centers, like many other organizations, is generally fuzzy and vague, for a further adjustment of the mentioned method with the existing situations of high education centers the proposed model is designed in fuzzy environments so that we would be able to evaluate the management performance of high engineering education centers in a more accurate way. Manuscript profile -
Open Access Article
36 - Measuring the Adaptation Rate of Car - Part Producing Firms with Just in Time System’s Criteria in Tabriz
Hoshang Taghizadeh Ghaffar Tari Mahdi Sadegi Hariri This paper tries to investigate the adaptation rate of car parts producing firms with Just in Time system’s criteria. Two questionnaires have been used for data gathering. The first one has been used to determine the current situation of More This paper tries to investigate the adaptation rate of car parts producing firms with Just in Time system’s criteria. Two questionnaires have been used for data gathering. The first one has been used to determine the current situation of the firms in terms of JIT system’s characteristics by 97 production managers of the firms. This questionnaire included 42 Five-statement questions that were scored in the range of 0-100. The second questionnaire (paired comparison matrix) was used for determining the importance weight of the sub criteria. Finally the adaptation rate of car part producing firms with JIT system’s criteria was measured using the weight mean formula. After calculations, radar chart showed that there is a relatively great gap between the situation of car part producing firms in Tabriz and the Just in Time systems. Manuscript profile -
Open Access Article
37 - Monitoring the land subsidence phenomenon using differential radar interferometry technique (Case Study: Khanmirza plain, Chaharmahal and Bakhtiari Province)
Sadegh Karimi Mohsen pourkhosravani Ayda RamezaniLand subsidence is one of the environmental hazards caused by various factors, and especially in recent years, it has caused a lot of damage to human societies. The Khanmirza plain aquifer has also faced this phenomenon in recent years. The creation of wide gaps and cra MoreLand subsidence is one of the environmental hazards caused by various factors, and especially in recent years, it has caused a lot of damage to human societies. The Khanmirza plain aquifer has also faced this phenomenon in recent years. The creation of wide gaps and cracks on the surface of the plain and the release of gas from them makes the issue of subsidence important. For this reason, the present study tries to monitor and measure the amount of land subsidence in Khanmirza plain, and evaluate and analyze its relationship with the withdrawal of excess from underground water sources. For this purpose, in order to investigate the changes in the underground water level during 10 years and in two different time frames from the IDW geostatistics model and to estimate the subsidence of the land surface using the differential radar interferometric method and from the Sentinel-1A radar images during 5 years and in Three different time periods were used. The results of the research indicate that displacement of the earth's surface in different time periods is different and does not have a constant trend, while the trend of the drop of the underground water level has been increasing in the whole time period. Accordingly, according to the results of the research, there is no significant relationship between the indiscriminate extraction of underground water sources and the subsidence areas in Khanmirza plain. Manuscript profile -
Open Access Article
38 - Modeling of displacement field and fault failure behavior based on collocation relationships; Case study of the May 97 Yasuj earthquake
Abdoulrasol GhanbariThe energy released during the rapid movement of the fault is the cause of most earthquakes. In our country, which has active faults and many seismic areas, recognizing the fault movements of the results of these movements is of special importance. In this study, using MoreThe energy released during the rapid movement of the fault is the cause of most earthquakes. In our country, which has active faults and many seismic areas, recognizing the fault movements of the results of these movements is of special importance. In this study, using up and down images of Sentinel-1 satellite and using multi-diaphragm radar interferometry techniques and ordinary radar interferometer, the 1397 Yasuj earthquake was studied and an isothermal deformation was prepared in both directions of the satellite line of sight and the azimuth path; And three orthogonal components of the displacement field were extracted using geodetic measurements. Then, in order to obtain the fault geometry and slip distribution on the fault plane, these components were analyzed using collocation optimization method and Akada elastic half-space analytical model. The displacements made due to the displacement of the fault due to the Yasuj earthquake in the study area show that the geological structure of the area after the earthquake has changed from its structure before the earthquake from -80 to -20 cm. Elements of surface displacement components obtained from the model, amount of displacements for Yasuj fault in the study area, the farther the distance from the fault across the Zagros, the less and less displacements, and the closer the adjacent faults, the displacements increase, the maximum altitude displacements for The image frame is equal to 0.45 to -0.45 m and the maximum amount of horizontal displacement is about 18 cm, which is more as it moves from the fault to the plain areas. Manuscript profile -
Open Access Article
39 - Angular Resolution Enhancement of the MIMO Radar by Using the 2D Nested Array Method
Rasoul Dehghani Rouhollah AghajaniIn phased array systems, increasing the array length and consequently increasing the number of antenna elements are needed to improve spatial resolution. It can be addressed by MIMO radars using orthogonal signals from multiple transmitters and using the virtual array. MoreIn phased array systems, increasing the array length and consequently increasing the number of antenna elements are needed to improve spatial resolution. It can be addressed by MIMO radars using orthogonal signals from multiple transmitters and using the virtual array. Virtual element's locations are derived from the convolution of the physical elements of the transmitter and receiver. To understand the functionality of MIMO radars, virtual array has been introduced. As the virtual array be larger, the radar angle resolution increase. Increasing the degree of freedom of the virtual array is highly dependent on the array of transmitter and receiver elements placement. The Nested Array which is one of the well-known methods in alignment of MIMO radar array elements, is investigated. In this article, the new nested array is examined and implemented in one dimension. The very innovative idea of this article is to use the new 2D nested array. A multi-step approach for implementing two-dimensional arrays using a new nested array for a MIMO radar is presented which can be generalized to any other structure with different number of elements. Finally, the advantages of the proposed method in terms of angular bandwidth of the main radar are presented. The results show that the proposed method is much more efficient than the other methods. The comparative results presented at the end of this article shows that the half-power beam width of the proposed method is approximately 0.3 degrees while this value for the nested method is more than 2 degrees. Manuscript profile -
Open Access Article
40 - Full-Wave Investigation of Far- and Near- Fields of a Vessel and Extracting Far-Field from Near-Field Data Scattered in X Frequency Band
Farzad Khajeh-Khalili Reza JokarIn this paper, the far- and near-fields of a vessel are discussed in the full-wave CST software environ­ment. In this regard, the far-field is extracted with the help of the data obtained from the scattered near-field. First, to explain the method used to calculate MoreIn this paper, the far- and near-fields of a vessel are discussed in the full-wave CST software environ­ment. In this regard, the far-field is extracted with the help of the data obtained from the scattered near-field. First, to explain the method used to calculate the scattered near-field, a simple structure (metal cube) is simulated. Then, by simulating the full-wave of a vessel with the dimensions of 130.8×20×23.1 cm3 or 1.54×103 λ3 at 8.5 GHz from the X-band, its far- and near-fields were calculated and reported according to the mentioned method. In the following, the far-field of this vessel is obtained with the help of the available data from the scattered near-field. The characteristic of the radar cross section (RCS) of this vessel is also calculated using the Asymptotic solver of the CST software. The maximum RCS of the vessel at 8.5 GHz is equal to 2.51 m2. In order to calculate all near- and far-electric fields, the Time Domain solver has been used. The simplicity of calculating the far-field from the near-field presented in this paper makes it possible to analyze similar structures using the same method. Manuscript profile -
Open Access Article
41 - Improved Angular Tracking Accuracy in Phased Array Radar
Ehsan Asgari Mojdeh Mahdavi Ruhollah HafezifardMonopulse is a technique which is used to detect radiation direction of waves. Radiation can be originated from active sources such as radar antennas, disturbances, etc., or passive sources, such as the reflector plates of an aircraft. Nowadays, monopulse technique has MoreMonopulse is a technique which is used to detect radiation direction of waves. Radiation can be originated from active sources such as radar antennas, disturbances, etc., or passive sources, such as the reflector plates of an aircraft. Nowadays, monopulse technique has been used in many modern radar systems. In radar tracking accuracy, the criterion for evaluating the angulation function is the differential gradient. It needs to have accurate information about antenna dimensions and wavelengths. In this paper, the difference gradient value is normalized and can be completed with knowing the radiation pattern of the antenna without knowing wavelength and gate dimensions. Then, by choosing a four-horns feed, the feed is optimized based on the squint angle. The results indicate that in the whole functional range, the optimum squint angle has the least angular error. Simulations provide us with confidence in the superior performance of the radar tracker with an optimal squint angle for all target angles within the range of the pattern of monopulse radar. Manuscript profile -
Open Access Article
42 - Presenting a New Approach in Simulation and Analysis of Shoulder Error on Radar Antenna Beam of Space-Based Artificial Aperture
Mehdi Shamekh Roozbeh Hamzehyan Najmeh Cheraghi Shirazi Abdolrasul GhasemiSince most space-based synthetic aperture radar systems have an accuracy of less than one meter in the resolution of images, very accurate processing of synthetic aperture radar data to produce images with high-resolution accuracy is of particular importance. In this ar MoreSince most space-based synthetic aperture radar systems have an accuracy of less than one meter in the resolution of images, very accurate processing of synthetic aperture radar data to produce images with high-resolution accuracy is of particular importance. In this article, methods for actual modeling and simulation of the space-based synthetic aperture radar system are presented and the raw data were obtained. For simulation and modeling, the main characteristics of the real satellite synthetic aperture radar system related to sensor mode/dynamics, target observation, antenna beam patterns, pointing errors on the antenna beam, and raw data generation are reflected. Analyzes based on simulations show the effectiveness of the presented methods. In the simulation, the presented method compensates for the phase errors induced by the aiming errors of the antenna beam. The results of the centralization of raw data, the calculated value of the resolution accuracy of the slant range is equal to 1.89 meters. Also, the average values of the measured slant range resolution accuracy, peak side-lobe ratio (PSLR), and integrated side-lobe ratio (ISLR) for the Interrogation Rate Frequency (IRF). An unweighted point in the focused image was obtained around 1.94 m, 13.57 dB and -10.26 dB respectively. The calculated value of azimuth resolution accuracy is 2.24 meters and the average values of measured azimuth resolution accuracy, PSLR, and ISLR for unweighted point target IRFs are 2.29 meters, -12.57 dB and -9.68 dB, respectively. These results show the effectiveness of the proposed method. In other words, the performance of space-based synthetic aperture radar image formation using the proposed method for raw data is very good, so the various effects induced by the real synthetic aperture radar sensor are reflected. Therefore, these results confirm the proposed methods for forming the space-based synthetic aperture radar image. Manuscript profile -
Open Access Article
43 - A review of forest biomass estimation and modeling methods by remote sensing
Razieh Hadavand Sadegh Mokhtarisabet Reza Abedzadegan Abdi -
Open Access Article
44 - Study of intensity, duration and type of flood mechanism thunderstorm by using Tabriz radar images
F. Arkian M. Karimkhani P.S. KatiraieIn recent years, flood producing thunderstorms have caused flood with severe human and financial damage in northwestern Iran, especially eastern Azarbaijan. In this research, we tried to obtain new and more accurate methods for acquiring knowledge about thunderstorms ty MoreIn recent years, flood producing thunderstorms have caused flood with severe human and financial damage in northwestern Iran, especially eastern Azarbaijan. In this research, we tried to obtain new and more accurate methods for acquiring knowledge about thunderstorms types. According to the weather reports, the data set containing five flood cases with twenty precipitable cells have been extracted in the area covered by Tabriz radar. Radar maximum reflectivity and its vertical cut products are used for detecting type, duration and intensity of thunderstorms. In addition, by using upper air data from sounding and General Forecast System (GFS) data with resolution of 0.5° × 0.5°, some instability indices such as K index, Showalter index, Total-Total index, Convective Available Potential Energy (CAPE), Bulk Richardson Number (BRN), Helicity, Energy – Helicity index, Vertical wind shear and precipitable water have been investigated. Results showed that the most flood producing thunderstorms were Single cell or Multi cells which after their movement and merging together, formed complex cells. Manuscript profile -
Open Access Article
45 - A Flexible Link Radar Control Based on Type-2 Fuzzy Systems
Sajad Rahmati Heshmat Asadi
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