檢測SAR圖像中徑向慢速動(dòng)目標(biāo)
Detecting Radial Moving Ground Targets from SAR Image
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摘要: 該文提出了一種從SAR圖像中檢測徑向勻速動(dòng)目標(biāo)的方法，將SAR圖像信號在頻域分為正頻部分和負(fù)頻部分，靜止背景的正負(fù)頻分布對稱，而徑向動(dòng)目標(biāo)的多普勒質(zhì)心與靜止背景相比有一頻移，信號在正負(fù)頻域能量分布不對稱。將分開的正負(fù)頻域信號分別回到時(shí)域成像，計(jì)算這兩幅復(fù)圖像對應(yīng)位置的模差絕對值，可對消靜止背景，突顯出徑向動(dòng)目標(biāo)。仿真數(shù)據(jù)表明本算法有效。
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關(guān)鍵詞:
- 合成孔徑雷達(dá); 移動(dòng)目標(biāo)檢測; 多普勒質(zhì)心
Abstract: This paper is proposes to detecting radial moving ground targets from SAR image. Radical moving targets have focused image just as fixed ground clutters. The algorithm for detection and parameter estimation of radical targets has three steps. The first step isolates the SAR image frequency spectrum to positive band and negative band, then uses IFFT transform to reform two images. The second step subtracts the two-look image amplitude, It offers an approach of suppressing ground clutters and simultaneously indicating the true location of the slant-range moving target image. Finally the radical ground speed of the moving target is carried out by the estimating its Doppler centroid. This combined method is implemented by using real clutter data combined with simulated moving targets. Typical computer results are presented, which illustrate this technique＇s availability. -
張賢達(dá),保錚.非平穩(wěn)信號分析與處理[M].北京:國防工業(yè)出版社,1998,9:84-107.[2]Perry R P, Dipietro R C, Fante R L. SAR imaging of moving targets[J].IEEE Trans. on Aerospace and Electronic Systems.1999, 35(1):188-199[3]Jos M B D, Paulo C M. Multiple moving target detection and trajectory estimation using a single SAR sensor[J]. IEEE Trans.on Aerospace and Electronic Systems,V2003, 39(2): 604- 624.[4]Fienup J R. Detecting moving targets in SAR imagery by focusing[J]. IEEE Trans. on Aerospace and Electronic Systems, V2001, 37(3): 794- 808.[5]Kirscht M. Detection.nullvelocity estimation and imaging of moving targets with single-channel SAR[J].. Proceeding of the EUSAR98,Germany.1998,:- -
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