J4 ›› 2010, Vol. 37 ›› Issue (4): 660-664+670.doi: 10.3969/j.issn.1001-2400.2010.04.014

• 研究论文 • 上一篇    下一篇

采用相干单距离多普勒干涉的太空碎片成像

刘亚波;张磊;邢孟道;保铮   

  1. (西安电子科技大学 雷达信号处理重点实验室,陕西 西安  710071)
  • 收稿日期:2009-05-05 出版日期:2010-08-20 发布日期:2010-10-11
  • 通讯作者: 刘亚波
  • 作者简介:刘亚波(1984-),男,西安电子科技大学博士研究生,E-mail: liuyabo9333@163.com.
  • 基金资助:

    国家自然科学基金资助项目(60802081);国家部委重点实验室基金资助项目(9140c0102090901)

Coherent single range doppler interferometry based space debris radar image

LIU Ya-bo;ZHANG Lei;XING Meng-dao;BAO Zheng   

  1. (Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an  710071, China)
  • Received:2009-05-05 Online:2010-08-20 Published:2010-10-11
  • Contact: LIU Ya-bo

摘要:

对于尺寸小于雷达距离分辨率的太空碎片的雷达成像,假设在平动运动完全补偿的条件下,根据太空碎片的运动特点,提出了采用相干单距离多普勒干涉的成像方法.该算法同时利用信号时频谱的强度和相位分布,通过正弦曲线搜索实现对信号的相干积分,从而获得太空碎片的高分辨二维图像.此外,分析了该算法的分辨率及图像质量与时频谱的关系,据此给出一种对应的窗函数的选取准则.

关键词: 雷达成像, 太空碎片, 相干单距离多普勒干涉, 时频特性

Abstract:

For space debris radar imaging with the dimension smaller than the radar range resolution, with the assumption that the translational motion is compensated, and considering movement features of space debris, a novel coherent single range Doppler interferometry (CSRDI) imaging algorithm is proposed, which utilizes the intensity and the phase distribution characteristic of the signal time-frequency spectrum, and implements coherent integration via sinusoid searching. Thus the high resolution 2D space distribution of a space debris is acquired. In addition, a detailed analysis of the relation between the time-frequency spectrum and the resolution as well as the quality of the image is made, and a standard for determining the window function is proposed. Numeric simulation verifies that an image with much finer resolution and higher quality can be achieved through the proposed approach, even under a low signal to noise rate (SNR) condition.

Key words: radar imaging, space debris, coherent single range Doppler interferometry, time-frequency characteristics