基于距離譜分析的方位多通道HRWS SAR通道偏差穩(wěn)健估計(jì)

房超; 劉艷陽(yáng); 索志勇; 李真芳; 陳筠力

doi:10.11999/JEIT170996

基于距離譜分析的方位多通道HRWS SAR通道偏差穩(wěn)健估計(jì)

doi: 10.11999/JEIT170996 cstr: 32379.14.JEIT170996

^①(西安電子科技大學(xué)雷達(dá)信號(hào)處理國(guó)家重點(diǎn)實(shí)驗(yàn)室西安 710071) ^②(上海衛(wèi)星工程研究所雷達(dá)總體與仿真技術(shù)實(shí)驗(yàn)室上海 201109) ^③(上海航天技術(shù)研究院上海 201109)

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61471276, 61601298, 61671355, 41371439)

詳細(xì)信息

作者簡(jiǎn)介:
房超：房超：男，1989年生，博士生，研究方向?yàn)闄C(jī)載方位多通道SAR /InSAR信號(hào)處理. 劉艷陽(yáng)：男，1987年生，高級(jí)工程師，研究方向?yàn)樾禽dSAR/InSAR系統(tǒng)仿真與信號(hào)處理. 索志勇：男，1978年生，副教授，研究方向?yàn)镾AR/InSAR系統(tǒng)分析和信號(hào)處理. 李真芳：男，1977年生，教授，研究方向?yàn)镾AR/InSAR系統(tǒng)分析與信號(hào)處理. 陳筠力：男，1971年生，研究員，研究方向?yàn)樾禽dSAR/InSAR系統(tǒng)設(shè)計(jì).

中圖分類(lèi)號(hào): TN958
計(jì)量
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出版歷程
- 收稿日期: 2017-10-24
- 修回日期: 2018-04-11
- 刊出日期: 2018-07-19

Robust Channel Mismatch Estimation in Multichannel HRWS SAR Based on Range Spectrum Analysis

FANG Chao^① LIU Yanyang^② SUO Zhiyong^① LI Zhenfang^① CHEN Junli^③

Funds:

The National Natural Science Foundation of China (61471276, 61601298, 61671355, 41371439)

摘要

摘要: 在方位多通道高分辨寬測(cè)繪帶合成孔徑雷達(dá)(HRWS SAR)系統(tǒng)中，通道間幅相偏差和通道時(shí)延偏差將會(huì)導(dǎo)致多普勒解模糊性能下降。為了解決該問(wèn)題，該文提出一種基于距離頻譜分析的方位多通道HRWS SAR通道偏差穩(wěn)健估計(jì)方法。該算法分為兩步：第1步，通過(guò)對(duì)相鄰?fù)ǖ阑夭ň嚯x頻譜的干涉相位進(jìn)行相位解纏繞和加權(quán)多項(xiàng)式擬合，從而獲得通道時(shí)延偏差的穩(wěn)健估計(jì)；第2步，基于空間互相關(guān)理論，根據(jù)通道間常數(shù)干涉相位同時(shí)估計(jì)基帶多普勒中心和通道間相位偏差。相比于傳統(tǒng)算法，該算法克服了相位纏繞和跳變對(duì)系數(shù)估計(jì)的影響，提高了算法穩(wěn)健性，而且能同時(shí)估計(jì)基帶多普勒中心和通道相位偏差。實(shí)測(cè)及仿真數(shù)據(jù)處理驗(yàn)證了該算法的穩(wěn)健性和精確性。
- 合成孔徑雷達(dá) /
- 通道偏差估計(jì) /
- 多通道
Abstract: In multichannel High-Resolution and Wide-Swath (HRWS) Synthetic Aperture Radar (SAR) systems, channel amplitude and phase mismatches would degrade the performance of azimuth ambiguity suppression as well as range sampling mismatches. To address this problem, a robust estimation method based on range spectrum analysis is proposed in this letter. The method includes two steps: firstly, by exploiting the interferometric phases between the range spectrums of adjacent channels, the proposed method can robustly estimate range sampling mismatches by the combination of phase unwrapping and a weighted least squares fitting. Secondly, based on the theory of spatial cross correlation, an accurate Doppler centroid and phase mismatches could be obtained from constant phases between adjacent channels. Compared with traditional methods, the proposed method overcomes the effect of phase wraps and jumps on polynomial coefficient estimation. It not only improves the robustness of parameter estimation but also can simultaneously obtain the Doppler centroid and phase mismatches. Experimental results based on airborne real data and simulated data validate its effectiveness of the proposed method.
- Synthetic Aperture Radar (SAR)、Channel mismatch estimation、Multichannel /

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參考文獻(xiàn)(16)

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