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2022-04-01
Development of Ground-Based SFCW-ArcSAR System and Investigation on Point Target Response
By
Progress In Electromagnetics Research M, Vol. 109, 137-148, 2022
Abstract
Arc synthetic aperture radar (ArcSAR) forms the synthetic aperture through uniform circular motion with antenna pointed outwards circular trajectory, so the point target response is different from traditional linear SAR and Circular SAR (CSAR). Due to the unique imaging mode, ArcSAR has the characteristics of large field of view and constant azimuth angular resolution. The ArcSAR system is built by vector network analyzer (VNA), rotating platform, standard gain horn antenna, and computer, and the system transmits stepped frequency continuous wave (SFCW). A Qt-based GUI is designed to realize the accurate and convenient remote control of the system. An outdoor imaging experiment was carried out with a corner reflector to investigate the point target response of SFCW-ArcSAR which has unique forms in Cartesian coordinate and cylindrical coordinate systems. In order to avoid the additional phase error introduced by coordinate transformation based on interpolation, back projection (BP) algorithm is applied in Cartesian coordinate system and cylindrical coordinate system, respectively. The point target response presents a 2-D sinc function in cylindrical coordinate system. The azimuth angular resolution is 0.0175 rad under the experimental condition of 1.9 m-rotating radius and 16˚ antenna beamwidth. The simulation results agree with measured ones, which prove the validity of SFCW-ArcSAR system and correctness of theoretical analysis. The imaging result based on BP algorithm and corner reflector can be used to evaluate other ArcSAR imaging algorithms.
Citation
Zhuoyan Gao Yan Jia Shuyi Liu Xiangkun Zhang , "Development of Ground-Based SFCW-ArcSAR System and Investigation on Point Target Response," Progress In Electromagnetics Research M, Vol. 109, 137-148, 2022.
doi:10.2528/PIERM21121702
http://www.jpier.org/PIERM/pier.php?paper=21121702
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