Journal of Systems Engineering and Electronics ›› 2009, Vol. 31 ›› Issue (7): 1581-1587.

• 传感器与信号处理 • 上一篇    下一篇

三通道SAR-GMTI地面快速目标检测

吕孝雷, 齐飞林, 邢孟道, 张守宏   

  1. 西安电子科技大学雷达信号处理国家重点实验室, 陕西, 西安, 710071
  • 收稿日期:2008-02-20 修回日期:2008-05-28 出版日期:2009-07-20 发布日期:2010-01-03
  • 作者简介:吕孝雷(1981- ),男,博士研究生,主要研究方向为雷达信号处理.E-mail:blue_horse@163.com
  • 基金资助:
    国家自然科学青年基金项目资助课题(60502044)

Ground fast moving target detection based on tri-channel SAR-GMTI

LÜ Xiao-lei, QI Fei-lin, XING Meng-dao, ZHANG Shou-hong   

  1. National Key Lab. of Radar Signal Processing, Xidian Univ., Xi’an 710071, China
  • Received:2008-02-20 Revised:2008-05-28 Online:2009-07-20 Published:2010-01-03

摘要: 地面运动目标速度较大时,会产生距离徙动,在图像域出现严重散焦,不易检测;同时存在PRF模糊现象,其多普勒频谱会发生折叠,不易正确定位。针对上述问题,提出了基于机载三通道SAR-GMTI的地面快速目标检测、定位与成像方法。首先,在距离压缩后的数据域进行相位中心偏置天线(displaced phase center anten-na,DPCA)杂波抑制,组合运用Canny算子、Ratio算子和Hough变换提取快速目标运动轨迹。然后,采用基于解PRF后的二阶Keystone变换方法完成目标的成像、检测及运动参数估计。最后,将快速目标融合到标有慢速运动目标的清晰SAR图像中。外场实测结果验证了该方法的有效性和准确性。

Abstract: Usually,the range migration through resolution cells which results in an image badly unfocused makes fast moving target hardly detect.Additionally,PRF ambiguity which results in Doppler spectrum folded strongly impairs accurate position. A method for ground fast-moving target detection,position and imaging based on the tri-channel airborne SAR-GMTI is presented in case of the problems above.Firstly,DPCA is used for clutter suppression when implemented on range compressed and azimuth-uncompressed data.The Canny operator,ratio operator and Hough transform are combined to extract the moving tracks.Then a method based on two-order Keystone transform after resolving PRF ambiguity is used for target imaging,detection and motion parameter estimation.Finally,the slow and fast-moving targets are together labeled on the SAR image.The results on raw data show the efficiency of the proposed method.

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