一種基于動目標聚焦的SAR-GMTI方法

韋北余; 朱岱寅; 吳迪

doi:10.11999/JEIT151036

一種基于動目標聚焦的SAR-GMTI方法

doi: 10.11999/JEIT151036

基金項目:

國家自然科學基金(61301212)，國防基礎(chǔ)科研計劃(B2520110008)，航空科學基金(20132052030)，中國博士后科學基金(2012M511750)，南京航空航天大學基本科研業(yè)務(wù)費(NS2013023), 江蘇高校優(yōu)勢學科建設(shè)工程

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出版歷程
- 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: 由于輸入信雜噪比(Signal to Clutter Noise Ratio, SCNR)較低，雜波抑制后超高頻(Ultra-High Frequency, UHF)波段合成孔徑雷達(Synthetic Aperture Radar, SAR)圖像中剩余靜止目標雜波導致系統(tǒng)虛警概率較高。該文提出一種動目標篩選方法，能夠判斷恒虛警概率(Constant False Alarm Rate, CFAR)檢測器檢測到的目標是否為動目標。提出一種動目原始數(shù)據(jù)恢復(fù)方法，能夠從整幅SAR圖像中恢復(fù)任意孤立點的多普勒相位歷史。采用距離多普勒處理對恢復(fù)的數(shù)據(jù)成像，然后采用方位自聚焦處理對所成子圖像進行重新聚焦。如果子圖像中目標為靜止目標，則聚焦前后子圖像不變，否則圖像被重新聚集。通過檢測圖像的變化可以排除虛假動目標。仿真及實測數(shù)據(jù)處理結(jié)果說明了該方法的有效性。
- 合成孔徑雷達 /
- -K算法 /
- 地面動目標指示 /
- 超高頻波段雷達
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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參考文獻(20)

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