發(fā)布時(shí)間：2019-05-30 08:05

【摘要】：方位多通道SAR系統(tǒng)通過抑制多普勒模糊,能夠?qū)崿F(xiàn)高分辨率和寬測繪帶(HRWS)對地觀測。針對通道間幅相偏差會(huì)導(dǎo)致成像結(jié)果中出現(xiàn)目標(biāo)模糊分量的問題,該文提出一種通道相位偏差估計(jì)算法。該算法利用通道間相位偏差會(huì)造成多通道重構(gòu)方位譜在主瓣內(nèi)展寬的特性,通過優(yōu)化多譜勒譜能夠?qū)崿F(xiàn)通道相位偏差的有效估計(jì)。該算法在通道相位偏差估計(jì)前不需要進(jìn)行多普勒中心估計(jì),減小了由多普勒中心估計(jì)不準(zhǔn)引入的誤差,并且在低信噪比的情況下仍然具有良好的估計(jì)性能�；诜抡鏀�(shù)據(jù)和實(shí)測數(shù)據(jù)的實(shí)驗(yàn)驗(yàn)證了該文算法的有效性。
[Abstract]:The azimuth multi-channel SAR system can realize high resolution and wide mapping band (HRWS) ground observation by suppressing Doppler blur. In order to solve the problem that the amplitude and phase deviation between channels will lead to the fuzzy component of the target in the imaging results, a channel phase deviation estimation algorithm is proposed in this paper. The algorithm makes use of the characteristic that the phase deviation between channels will cause the azimuth spectrum of multi-channel reconstruction to widen in the main lobe, and the effective estimation of channel phase deviation can be realized by optimizing the multi-spectral spectrum. The algorithm does not need Doppler center estimation before channel phase deviation estimation, reduces the error that can not be introduced by Doppler center estimation, and still has good estimation performance in the case of low signal-to-noise ratio (SNR). The effectiveness of the proposed algorithm is verified by experiments based on simulation data and measured data.
【作者單位】： 西安電子科技大學(xué)雷達(dá)信號處理國家重點(diǎn)實(shí)驗(yàn)室;上海衛(wèi)星工程研究所;上海航天技術(shù)研究院;
【基金】：國家自然科學(xué)基金(61471276,61601298,61671355)~~
【分類號】：TN958

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