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中国科学院大学学报 ›› 2025, Vol. 42 ›› Issue (6): 781-791.DOI: 10.7523/j.ucas.2024.013

• 电子信息与计算机科学 • 上一篇    下一篇

一种改进的面向星上处理的SAR俯仰向多零点数字波束实时形成技术

崔泽楷1,2, 肖灯军1, 邱劲松1   

  1. 1 中国科学院空天信息创新研究院, 北京 100094;
    2 中国科学院大学电子电气与通信工程学院, 北京 100049
  • 收稿日期:2024-02-02 修回日期:2024-03-28 发布日期:2024-04-24
  • 通讯作者: 崔泽楷, E-mail:cuizekai21@mails.ucas.ac.cn
  • 基金资助:
    国家重点研发计划(2023YFB3904901)资助

An improved on-satellite-processing real-time digital formation technique of multi-zero beams for satellite-based SAR in elevation

CUI Zekai1,2, XIAO Dengjun1, QIU Jinsong1   

  1. 1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China;
    2 School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-02-02 Revised:2024-03-28 Published:2024-04-24

摘要: 星下点和距离模糊点的回波会降低高分辨率宽测绘带星载合成孔径雷达(SAR)成像质量,使用数字波束形成技术(DBF)可以使天线方向图在对应方向形成零陷以进行抑制。现有的多零点DBF处理技术难以在星上实现,为了将DBF-SAR成像技术工程化,提出一种改进的工程上可实现的俯仰向多零点DBF实时处理方法。该方法对回波信号实时加权,使用LDLT分解迭代解决多零点实时权重生成中面临的线速矩阵求逆问题,从而抑制星下点回波和距离模糊以增加波位选择范围。通过多点目标仿真验证了该实时处理方案的有效性。

关键词: 合成孔径雷达, 数字波束形成, 实时处理, 零点指向, 距离模糊抑制

Abstract: The echoes of the nadir and the range ambiguity point will degrade the quality of high-resolution wide mapping band satellite-based synthetic aperture radar (SAR) imaging, and the use of digital beam forming (DBF) can make the antenna directional map to form a null in the corresponding direction for suppression. It is difficult to implement the existing multi-zero-points DBF processing technology on the satellite. In order to engineer DBF-SAR imaging technology, this paper proposes a set of improved engineering-achievable real-time multi-zero DBF processing method in elevation, which weights the echo signals in real time, and solves the inverse line velocity matrix problem faced in the real-time multi-zero weight generation by using the LDLT decomposition iteration to inhibit the Nadir echoes and range ambiguity in order to increase the range of the wave-position selection. The effectiveness of this real-time processing scheme is verified by multi-point target simulation.

Key words: SAR, digital beam-forming (DBF), real-time processing, null steering, range ambiguity suppression

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