姿态测量误差对星载合成孔径雷达成像质量影响

Colbie

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姿态测量误差对星载合成孔径雷达成像质量影响

（电波科学学报2015年第30卷第六期）

. L* y: z& P) a) k" {3 D摘要：针对高分辫率条件下卫星弯曲轨迹与姿态测量误差藕合对成像质量的影响开展 分析．首先结合高分辨率星载滑动聚束合成孔径雷达（Synthetic Aperture Radar, SAR) 成像特点，解析回波信号的空一时一频特性，分析姿态测量误差对回波信号空一时一频特性的 影响，构建该影响与成像质量之间的数学映射关系．然后基于高次相位补偿的三步成像算 法分析误差所引入的高次补偿相位误差，并给出是否需要进行高次相位补偿的误差临界 值．最后，通过计算机仿真验证理论分析的正确性。

* |2 C# A3 e. ^* R& p+ s4 U$ s( {- ]关键词：星载滑动聚束SAR；姿态测量误差；多普勒中心频率误差；高次相位补偿；成像 算法
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Abstract： Under high resolution condition,the effect of coupling between satellite curved orbit and attitude measurement error on imaging quality was studied. Firstly, combined with imaging characteristic of high resolution spaceborne sliding spotlight syn-thetic aperture radar (SAR),the space-time-frequency property of echo signal was ana-- lyzed and attitude measurement error effect on it was discussed. Mapping relationship between attitude measurement error and imaging quality was also given. Then based on three-step focusing algorithm combined with high-order phase compensation procedure, the high-order compensating phase error was analyzed. The critical value of error was brought forward as to whether or not to employ high-order phase compensation could get better imaging quality. Finally,computer simulation results identify the validity of theoretical analysis.
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: N# x9 }4 L0 T2 B  HKey words： spaceborne sliding spotlight SAR;attitude measurement error;Doppler centroid error;high-order phase compensation;imaging algorithm

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Demyar

好东东必须顶。