Journal of Astronautics ›› 2013, Vol. 34 ›› Issue (2): 237-245.doi: 10.3873/j.issn.1000-1328.2013.02.013

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Three-Dimensional Imaging Technique of Space Moving Target Based on Spaceborne Along-Cross Track Millimeter-Wave In-ISAR

YIN Jian feng,  LI Dao jing,  WANG Ai ming, LI Zhi   

  1. 1.China Academy of Space Technology, Beijing 100094, China; 2.Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2012-02-05 Revised:2012-05-11 Online:2013-02-15 Published:2013-02-25

Abstract:

The three-dimensional (3 D) images of space targets with spaceborne along-cross track millimeter-wave (MMW) interferometric inverse synthetic aperture radar (In-ISAR) is studied under the condition of low SNR input in this paper. Because the traditional Range Doppler (RD) algorithm can’t get good performance when the target size is large and required high resolution. The wave number domain imaging algorithm is introduced to obtain two-dimensional (2 D) high resolution images of space moving targets. Then along-cross track interferometric processing is implemented for the three  2 D  images obtained from three antennas to determine 3 D positions of the target scattering points. As the foundation of  2 D  imaging and image registration, target detection and 3 D velocity estimation at
low SNR input are studied here. The requirement for velocity estimation accuracy is analyzed. Finally, numerical experimental results are given to demonstrate the effectiveness of the along-cross track In-SAR system.

 

Key words: Spaceborne SAR, In ISAR, Space target imaging, 3 D imaging, Wave number domain imaging algorithm, Target velocity estimation

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