用聚束SAR對慢速運動目標進行軌跡跟蹤和參數(shù)估計的方法
Method of Tracking Ground Slowly Moving Target and Estimating Its Velocity Parameters by Spotlight Mode Synthetic Aperture Radar
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摘要: 針對聚束式合成孔徑雷達(SAR)動目標檢測的問題，把回波信號進行連續(xù)重疊地時域分組，每組信號可以看成是來自一個時域子孔徑, 然后在每個子孔徑內(nèi)分別成像。地面固定目標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，達到了抑制雜波的目的，而運動目標由于每個時刻的位置都在變化，在每幅圖像上的位置是不同的, 從而在相減后剩余下運動目標的圖像，把這些圖像拼接起來就再現(xiàn)了運動目標的運動軌跡，根據(jù)運動軌跡就可以對其運動參數(shù)進行估計。該文給出了這個方法的原理推導和具體的檢測過程。仿真結(jié)果證明了該方法的有效性。
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關(guān)鍵詞:
- 合成孔徑雷達(SAR);運動目標檢測和成像;時域子孔徑
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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