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中文摘要：
针对分布式卫星合成孔径雷达（synthetic aperture radar，SAR）系统中星间基线时变导致高程干涉相位补偿困难和SAR图像对相干性下降的问题，从分布式卫星SAR系统的观测几何构型出发，提出了一种时变基线补偿方法。该方法采用总体最小二乘法拟合航迹方程，并依据方程参数重构虚拟的平行航迹，通过补偿原航迹和新航迹上的观测波程差获得等效的固定基线回波数据。仿真实验表明，采用该方法进行时变基线补偿后，能有效提高SAR图像对的相干性和地面动目标检测（ground moving target indication，GMTI）性能。
英文摘要：
The time varying baseline in distributed satellite synthetic aperture radar （SAR） systems makes it difficult to compensate the terrain interferometric phase and causes the coherence of the pair of SAR images to descend. For the purpose of overcoming the influence of the time varying baseline, a compensation method based on the geometrical configuration of distributed-satellite SAR systems is proposed. The total least square algorithm is applied to fit the track equations of the satellites. Then a new virtual parallel track is constructed with the parameters of the track equations. An equivalent constant baseline is obtained by the compensation of the path difference between the new and the original tracks. Simulation results illustrate that the coherence of the pair of SAR images and the performance of ground moving target indication are improved by the time-varying baseline compensation.
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