星載SAR多普勒質(zhì)心估記的新方法幅度相關(guān)法
A NEW METHOD TO ESTIMATE DOPPLER CENTROID FOR SPACEBORNE SAR-AMPLITUDE CORRELATION METHOD
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摘要: 本文分析了星載合成孔徑雷達(dá)(SAR)多普勒質(zhì)心與距離走動(dòng)之間的線性關(guān)系,提出了一種估計(jì)多普勒質(zhì)心的新方法幅度相關(guān)法。利用星載SEASAT-A SAR原始數(shù)據(jù),討論了該方法與目前最常用的雜波鎖定法的差別。結(jié)果表明,采用幅度相關(guān)法具有運(yùn)算量小和在準(zhǔn)均勻或非均勻場(chǎng)景下估計(jì)精度高的優(yōu)越性。Abstract: The linear relationship between Doppler centroid and range walki, in spaceborne SAR data is analysed,and a new method to estimate Doppler centroir is proposed, which is called amplitude correlation method. Compared with Li s(1985) clutterlock method that is widely used now, the new method has much less compv tation burden and is able to give higher estimation accuracy for a quasi-homogeneous or a non-homogeneous scene. This is clearly verified by the experimental results of estimating Doppler centroid for S...
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