一种基于动目标聚焦的SAR-GMTI方法

韦北余; 朱岱寅; 吴迪

doi:10.11999/JEIT151036

一种基于动目标聚焦的SAR-GMTI方法

doi: 10.11999/JEIT151036

基金项目:

国家自然科学基金(61301212)，国防基础科研计划(B2520110008)，航空科学基金(20132052030)，中国博士后科学基金(2012M511750)，南京航空航天大学基本科研业务费(NS2013023), 江苏高校优势学科建设工程

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出版历程
- 收稿日期: 2015-09-14
- 修回日期: 2016-02-19
- 刊出日期: 2016-07-19

A SAR-GMTI Approach Based on Moving Target Focusing

Funds:

The National Natural Science Foundation of China (61301212), Defense Industrial Technology Development Program (B2520110008), Aeronautical Science Foundation of China (20132052030), China Postdoctoral Science Foundation (2012M511750), NUAA Fundamental Research Funds (NS2013023), Priority Academic Program Development of Jiangsu Higher Education Institutions

摘要

摘要: 由于输入信杂噪比(Signal to Clutter Noise Ratio, SCNR)较低，杂波抑制后超高频(Ultra-High Frequency, UHF)波段合成孔径雷达(Synthetic Aperture Radar, SAR)图像中剩余静止目标杂波导致系统虚警概率较高。该文提出一种动目标筛选方法，能够判断恒虚警概率(Constant False Alarm Rate, CFAR)检测器检测到的目标是否为动目标。提出一种动目原始数据恢复方法，能够从整幅SAR图像中恢复任意孤立点的多普勒相位历史。采用距离多普勒处理对恢复的数据成像，然后采用方位自聚焦处理对所成子图像进行重新聚焦。如果子图像中目标为静止目标，则聚焦前后子图像不变，否则图像被重新聚集。通过检测图像的变化可以排除虚假动目标。仿真及实测数据处理结果说明了该方法的有效性。
- 合成孔径雷达 /
- -K算法 /
- 地面动目标指示 /
- 超高频波段雷达
Abstract: Due to the low Signal to Clutter Noise Ratio (SCNR), the residual stationary targets in a clutter suppressed multichannel Ultra-High Frequency (UHF) band Synthetic Aperture Radar (SAR) image may lead to an unacceptable false alarm rate. A method of moving target screening is presented in this paper, which can determine whether the target detected by the Constant False Alarm Rate (CFAR) detector is a real moving one. A moving target data recovery method is described, which can recover the Doppler phase history of any isolated target within a full-K SAR image. The recovered data is processed again into a sub-image by range Doppler processing, and the sub-image is refocused with azimuth autofocus processing. The sub-image will not change after refocusing if the target in it is a stationary one, and it will be refocused if the target is a moving one. The false moving target can be eliminated by detecting this change. The proposed method is demonstrated on simulated and real SAR Ground Moving Target Indication (GMTI) data.
- Synthetic Aperture Radar (SAR) /
- -K algorithm /
- Ground Moving Target Indication (GMTI) /
- Ultra- High Frequency (UHF) band radar

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参考文献(20)

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