星载SAR等效斜视波数域算法的实现方法

An Implementation Method of Equivalent Squint Wavenumber Domain Algorithm for Spaceborne SAR

等效斜视的波数域算法是一种适用于大距离徙动高分辨率星载合成孔径雷达成像的优化算法。该算法可以利用雷达发射信号的复制信号作为距离参考信号。由于该算法在频域插值,对插值精度要求高。多普勒参数的精度和加权处理对该算法的成像性能指标具有重要的影响。文中从距离参考函数、Stolt插值、多普勒参数估计和加权处理4个方面分析了等效斜视波数域算法的实现方法,并通过仿真测试对几种可能方法的成像质量指标进行了比较,实验结果验证了等效斜视波数域算法实现方法的有效性。

Equivalent squint wavenumber domain algorithm is an optimized algorithm suitable for precise imaging of high resolution spaceborne SAR with large range cell migration. The replica of radar- transmitted signal may be used as the range reference function of this algorithm. This algorithm require high interpolation precision because the interpolation is done in frequency domain. The precision of Doppler parameters and weighting processing have important effect on the quality index of imaging. The implementation method of equivalent squint wavenumber domain algorithm is analyzed in terms of range reference function, stolt interpolation, Doppler parameters estimation and weighting processing. A great amount of simulated test validated the implementation method of equivalent squint wavenumber domain algorithm. [