机载大斜视SAR的运动补偿方法

An Approach to the Motion Compensation of Airborne SAR Processing of Highly Squinted Data

对机载大斜视的合成孔径雷达成像因速度变化引起的运动补偿方面的问题展开了研究 ,提出了大斜视角条件下运动补偿的方法 ,对其分别进行一次和二次相位补偿 ,并在进行方位压缩时考虑三次相位 ,其结果能较好地实现运动补偿。同时对补偿性能也作了分析 ,对基于运动参数估计的窄波束宽幅SAR成像算法进行了改进 ,增加一次和二次相位补偿的步骤 。

A study is made of the motion compensation of airborne SAR processing of highly squinted data when the airborne velocity is not a constant, following a approach proposed. According to the approach, the first and the second phase compensations are made and the third phase is taken in account in the azimuth compression. Then, motion compensations are combined with imaging algorithm perfectly. An analysis of the performance is also made. Finally, an algorithm for the airborne SAR processing of highly squinted data is given by adding the first and the second phase compensation to the wide azimuth scene SAR imaging algorithm of narrow beam SAR based on motion parameter estimate. [