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在合成孔径雷达中采用多通道体制有利于实现高分辨率宽测绘带成像,对SAR干涉测高提高测高精度和效率有重要意义。但多通道体制的引入也会带来通道误差,降低成像及干涉测高性能。通道误差主要可归结为通道幅度误差、通道相位误差、沿航位置误差。姿态误差是对系统性能影响很大的误差,其引起的距离迁移和距离空变误差很小,主要引起通道相位误差。对姿态误差对成像性能的影响进行了分析,可得姿态误差会造成图像ISLR和PSLR的恶化。对姿态误差对干涉测高性能的影响也进行了分析,可得姿态误差误差还会引起干涉相干系数的恶化,特别是在干涉的主辅星具有反向相位误差的情况下最为严重。
The use of multi-channel system in synthetic aperture radar is beneficial to the imaging of high-resolution wide swath. It is of great significance to improve the accuracy and efficiency of SAR measurement. However, the introduction of multi-channel system will also bring channel error, reduce imaging and interference altimetry performance. Channel errors can be mainly attributed to the channel amplitude error, channel phase error, coastal position error. Attitude error is an error that has a great influence on the system performance. The error caused by the distance migration and the distance free change is very small, which causes the phase error of the channel. The influence of attitude error on the imaging performance is analyzed, and the attitude error can cause the image ISLR and PSLR to deteriorate. The influence of attitude error on interferometric altimeter performance is also analyzed. The error of attitude error can also lead to the deterioration of the interference coherence coefficient, especially in the case of the interference of the main and auxiliary stars with the reverse phase error.