用聚束SAR對(duì)慢速運(yùn)動(dòng)目標(biāo)進(jìn)行軌跡跟蹤和參數(shù)估計(jì)的方法
Method of Tracking Ground Slowly Moving Target and Estimating Its Velocity Parameters by Spotlight Mode Synthetic Aperture Radar
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摘要: 針對(duì)聚束式合成孔徑雷達(dá)(SAR)動(dòng)目標(biāo)檢測的問題，把回波信號(hào)進(jìn)行連續(xù)重疊地時(shí)域分組，每組信號(hào)可以看成是來自一個(gè)時(shí)域子孔徑, 然后在每個(gè)子孔徑內(nèi)分別成像。地面固定目標(biāo)在每幅圖像上的成像情況是相同的, 通過彼此相減就可以消去，達(dá)到了抑制雜波的目的，而運(yùn)動(dòng)目標(biāo)由于每個(gè)時(shí)刻的位置都在變化，在每幅圖像上的位置是不同的, 從而在相減后剩余下運(yùn)動(dòng)目標(biāo)的圖像，把這些圖像拼接起來就再現(xiàn)了運(yùn)動(dòng)目標(biāo)的運(yùn)動(dòng)軌跡，根據(jù)運(yùn)動(dòng)軌跡就可以對(duì)其運(yùn)動(dòng)參數(shù)進(jìn)行估計(jì)。該文給出了這個(gè)方法的原理推導(dǎo)和具體的檢測過程。仿真結(jié)果證明了該方法的有效性。Abstract: Focused the issues on Moving Target Detection (MTD) in spotlight mode Synthetic Aperture Radar (SAR),the echo is divided into groups that are continuous and partly overlapping in time domain. Every group of data can be regarded as coming from a sub-aperture of time domain. The images of same ground scene are then generated in multiple sub-apertures. By Subtracting two consecutive sub-aperture SAR images, the stationary clutter or targets that appear in a sub-aperture SAR image can be suppressed or substantially eliminated, but moving target image is left. Superposing the result of subtracting every two consecutive sub-aperture SAR images, the tract of this moving target is obtained. Furthermore, its moving parameters can be estimated. This paper proved this method in theory and the simulation result testifies its validity.
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