SAR regional all-azimuth observation orbit design for target 3D reconstruction  

作　　者：WANG Yanan ZHOU Chaowei LIU Aifang MAO Qin 

机构地区：[1]Beijing Institute of Tracking and Communication Technology,Beijing 100094,China [2]Nanjing Research Institute of Electronics Technology,Nanjing 210012,China [3]Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China

出　　处：《Journal of Systems Engineering and Electronics》2024年第3期609-618,共10页系统工程与电子技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (62001436);the Natural Science Foundation of Jiangsu Province under (BK 20190143,JSGG20190823094603691)。

摘　　要：Three-dimensional(3D) synthetic aperture radar(SAR)extends the conventional 2D images into 3D features by several acquisitions in different aspects. Compared with 3D techniques via multiple observations in elevation, e.g. SAR interferometry(InSAR) and SAR tomography(TomoSAR), holographic SAR can retrieve 3D structure by observations in azimuth. This paper focuses on designing a novel type of orbit to achieve SAR regional all-azimuth observation(AAO) for embedded targets detection and holographic 3D reconstruction. The ground tracks of the AAO orbit separate the earth surface into grids. Target in these grids can be accessed with an azimuth angle span of360°, which is similar to the flight path of airborne circular SAR(CSAR). Inspired from the successive coverage orbits of optical sensors, several optimizations are made in the proposed method to ensure favorable grazing angles, the performance of 3D reconstruction, and long-term supervision for SAR sensors. Simulation experiments show the regional AAO can be completed within five hours. In addition, a second AAO of the same area can be duplicated in two days. Finally, an airborne SAR data process result is presented to illustrate the significance of AAO in 3D reconstruction.

关 键 词：synthetic aperture radar(SAR) orbit design all-azimuth observation(AAO) three-dimensional(3D)reconstruction successive coverage 

分 类 号：TN957.52[电子电信—信号与信息处理]