中国物理B ›› 2017, Vol. 26 ›› Issue (10): 108401-108401.doi: 10.1088/1674-1056/26/10/108401

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

High resolution inverse synthetic aperture radar imaging of three-axis-stabilized space target by exploiting orbital and sparse priors

Jun-Tao Ma(马俊涛), Mei-Guo Gao(高梅国), Bao-Feng Guo(郭宝锋), Jian Dong(董健), Di Xiong(熊娣), Qi Feng(冯祺)   

  1. 1. School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China;
    2. Department of Electronic and Optical Engineering, Ordnance Engineering College, Shijiazhuang 050003, China
  • 收稿日期:2017-03-23 修回日期:2017-04-25 出版日期:2017-10-05 发布日期:2017-10-05
  • 通讯作者: Jun-Tao Ma E-mail:tm0508@sina.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61601496 and 61401024).

High resolution inverse synthetic aperture radar imaging of three-axis-stabilized space target by exploiting orbital and sparse priors

Jun-Tao Ma(马俊涛)1,2, Mei-Guo Gao(高梅国)1, Bao-Feng Guo(郭宝锋)2, Jian Dong(董健)2, Di Xiong(熊娣)1, Qi Feng(冯祺)1   

  1. 1. School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China;
    2. Department of Electronic and Optical Engineering, Ordnance Engineering College, Shijiazhuang 050003, China
  • Received:2017-03-23 Revised:2017-04-25 Online:2017-10-05 Published:2017-10-05
  • Contact: Jun-Tao Ma E-mail:tm0508@sina.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61601496 and 61401024).

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摘要： The development of inverse synthetic aperture radar (ISAR) imaging techniques is of notable significance for monitoring, tracking and identifying space targets in orbit. Usually, a well-focused ISAR image of a space target can be obtained in a deliberately selected imaging segment in which the target moves with only uniform planar rotation. However, in some imaging segments, the nonlinear range migration through resolution cells (MTRCs) and time-varying Doppler caused by the three-dimensional rotation of the target would degrade the ISAR imaging performance, and it is troublesome to realize accurate motion compensation with conventional methods. Especially in the case of low signal-to-noise ratio (SNR), the estimation of motion parameters is more difficult. In this paper, a novel algorithm for high-resolution ISAR imaging of a space target by using its precise ephemeris and orbital motion model is proposed. The innovative contributions are as follows. 1) The change of a scatterer projection position is described with the spatial-variant angles of imaging plane calculated based on the orbital motion model of the three-axis-stabilized space target. 2) A correction method of MTRC in slant-and cross-range dimensions for arbitrarily imaging segment is proposed. 3) Coarse compensation for translational motion using the precise ephemeris and the fine compensation for residual phase errors by using sparsity-driven autofocus method are introduced to achieve a high-resolution ISAR image. Simulation results confirm the effectiveness of the proposed method.

关键词: space target, ISAR imaging, MTRC correction, sparsity

Abstract: The development of inverse synthetic aperture radar (ISAR) imaging techniques is of notable significance for monitoring, tracking and identifying space targets in orbit. Usually, a well-focused ISAR image of a space target can be obtained in a deliberately selected imaging segment in which the target moves with only uniform planar rotation. However, in some imaging segments, the nonlinear range migration through resolution cells (MTRCs) and time-varying Doppler caused by the three-dimensional rotation of the target would degrade the ISAR imaging performance, and it is troublesome to realize accurate motion compensation with conventional methods. Especially in the case of low signal-to-noise ratio (SNR), the estimation of motion parameters is more difficult. In this paper, a novel algorithm for high-resolution ISAR imaging of a space target by using its precise ephemeris and orbital motion model is proposed. The innovative contributions are as follows. 1) The change of a scatterer projection position is described with the spatial-variant angles of imaging plane calculated based on the orbital motion model of the three-axis-stabilized space target. 2) A correction method of MTRC in slant-and cross-range dimensions for arbitrarily imaging segment is proposed. 3) Coarse compensation for translational motion using the precise ephemeris and the fine compensation for residual phase errors by using sparsity-driven autofocus method are introduced to achieve a high-resolution ISAR image. Simulation results confirm the effectiveness of the proposed method.

Key words: space target, ISAR imaging, MTRC correction, sparsity

中图分类号:  (Telemetry: remote control, remote sensing; radar)

  • 84.40.Xb
91.10.Sp (Satellite orbits) 84.40.Ua (Telecommunications: signal transmission and processing; communication satellites)