基于距离谱分析的方位多通道HRWS SAR通道偏差稳健估计

房超; 刘艳阳; 索志勇; 李真芳; 陈筠力

doi:10.11999/JEIT170996

基于距离谱分析的方位多通道HRWS SAR通道偏差稳健估计

doi: 10.11999/JEIT170996

^①(西安电子科技大学雷达信号处理国家重点实验室西安 710071) ^②(上海卫星工程研究所雷达总体与仿真技术实验室上海 201109) ^③(上海航天技术研究院上海 201109)

基金项目:

国家自然科学基金(61471276, 61601298, 61671355, 41371439)

详细信息

作者简介:
房超：房超：男，1989年生，博士生，研究方向为机载方位多通道SAR /InSAR信号处理. 刘艳阳：男，1987年生，高级工程师，研究方向为星载SAR/InSAR系统仿真与信号处理. 索志勇：男，1978年生，副教授，研究方向为SAR/InSAR系统分析和信号处理. 李真芳：男，1977年生，教授，研究方向为SAR/InSAR系统分析与信号处理. 陈筠力：男，1971年生，研究员，研究方向为星载SAR/InSAR系统设计.

中图分类号: TN958
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出版历程
- 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宽测绘带合成孔径雷达(HRWS SAR)系统中，通道间幅相偏差和通道时延偏差将会导致多普勒解模糊性能下降。为了解决该问题，该文提出一种基于距离频谱分析的方位多通道HRWS SAR通道偏差稳健估计方法。该算法分为两步：第1步，通过对相邻通道回波距离频谱的干涉相位进行相位解缠绕和加权多项式拟合，从而获得通道时延偏差的稳健估计；第2步，基于空间互相关理论，根据通道间常数干涉相位同时估计基带多普勒中心和通道间相位偏差。相比于传统算法，该算法克服了相位缠绕和跳变对系数估计的影响，提高了算法稳健性，而且能同时估计基带多普勒中心和通道相位偏差。实测及仿真数据处理验证了该算法的稳健性和精确性。
- 合成孔径雷达 /
- 通道偏差估计 /
- 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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参考文献(16)

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