星載SAR DPCMAB技術(shù)的方位向非均勻采樣研究
Study of Nonuniform Azimuth Sampling of DPCMAB Technique in Spaceborne SAR
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摘要: 在星載SAR分離相位中心方位多波束(DPCMAB)系統(tǒng)中，發(fā)射脈沖盲區(qū)和星下點(diǎn)回波盲區(qū)的存在會(huì)引起方位向非均勻采樣，從而在方位向沖激響應(yīng)的主瓣兩側(cè)產(chǎn)生不期望的尖峰。該文采用Spectral-Fit法和時(shí)域重構(gòu)法在不影響圖像性能的基礎(chǔ)上，消除了非均勻采樣帶來的影響。最后通過對(duì)兩者運(yùn)算量的分析，指出時(shí)域重構(gòu)法優(yōu)于Spectral-Fit法。Abstract: In the system of Displaced Phase Centre Multiple Azimuth Beams (DPCMAB) of spaceborne SAR，the transmitter blinding and nadir echo eclipsing events can lead to nonuniform azimuth sampling that results in the appearance of unexpected peaks on the both sides of mainlobe of azimuth impulse response. In this paper，the Spectral-Fit method and the reconstruction in time domain method are adopted to eliminate the effect due to azimuth nonuniform sampling with the quality of image being unaffected. Contrasting the number of arithmetic operations of the above two methods, it is shown that the reconstruction in time domain method is superior to the Spectral-Fit method.
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李衍達(dá)，常迥.信號(hào)重構(gòu)理論及應(yīng)用.北京:清華大學(xué)出版社，1991: 19一20.[4]Golub G H, Van Loan C F.著，衰業(yè)湘等譯.矩陣計(jì)算.北京:科學(xué)出版社，2001: 520一530. -
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