Journal of Systems Engineering and Electronics ›› 2024, Vol. 35 ›› Issue (3): 609-618.doi: 10.23919/JSEE.2023.000161

• DEFENCE ELECTRONICS TECHNOLOGY • Previous Articles    

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

Yanan WANG1(), Chaowei ZHOU2,*(), Aifang LIU2(), Qin MAO3()   

  1. 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
  • Received:2021-12-09 Accepted:2023-10-20 Online:2024-06-18 Published:2024-06-19
  • Contact: Chaowei ZHOU E-mail:aaa123@yahoo.cn;zcwlzyz@163.com;lafsx@163.com;Mq199311@163.com
  • About author:
    WANG Yanan was born in 1979. She received her Master ’s degree in photogrammetry and remote sensing from the School of Remote Sensing and Information engineering, Wuhan University, Wuhan, China, in 2005. She has been working in Beijing Institute of Tracking and Communication Technology since 2005. Her research interests is space photogrammetry including processing and applications for airborne and space-borne lidar. E-mail: aaa123@yahoo.cn

    ZHOU Chaowei was born in 1993. He received his B.S. degree in electronic engineering in 2015 and Ph. D. degree in signal and information processing in 2021 from Xidian University, Xi’an, China. He is currently working as an engineer in Nanjing Research Institute of Electronics Technology. His research interests are space-borne synthetic aperture radar (SAR) system design and target three dimensional reconstructions with SAR system. E-mail: zcwlzyz@163.com

    LIU Aifang was born in 1974. He received his B.S. degree in electronic engineering from Shanxi University, Taiyuan, China, in 1997, and M.S. degree and Ph.D. degree in communication and information system from Nanjing University of Science and Technology, Nanjing China, in 2001 and 2004, respectively. He is currently working in Nanjing Research Institute of Electronics Technology. His research interests are design of space-based radar system and synthetic aperture radar system. E-mail: lafsx@163.com

    MAO Qin was born in 1993. She received her B.S. degree in communication engineering from Chang’an University, Xi’an, China, in 2016 and M.S. degree in signal and information processing from Xidian University, Xi’an, China, in 2019. She is currently working in Shanghai Aerospace Electronic Technology Institute, Shanghai, China. Her research interests are synthetic aperture radar interferometry (InSAR) and differential InSAR (DInSAR). E-mail: Mq199311@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (62001436) and the Natural Science Foundation of Jiangsu Province under (BK 20190143; JSGG20190823094603691).

Abstract:

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 of 360°, 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.

Key words: synthetic aperture radar (SAR), orbit design, all-azimuth observation (AAO), three-dimensional (3D) reconstruction, successive coverage