一种适合GEOSAR成像改进的快速BP算法

An Improved Fast Back-Projection Algorithm for Geosynchronous SAR Imaging

针对原始BP算法计算量大的问题,根据地球同步轨道SAR合成孔径时间长,利于子孔径处理的特点,结合子孔径成像算法和去冗余BP算法提出了一种改进的快速BP算法,该算法在子孔径内就进行去冗余运算,相当于对一个合成孔径做了2次的子孔径划分,综合利用了两者运算速度使算法的速度进一步得到提高。仿真结果表明该算法极大提高了运算速度,也能实现良好聚焦,使得该算法更好地在工程上实现。

To solve the large computational burden of original BP algorithm, an improved fast BP algorithm is put forward by combining sub-aperture imaging algorithm and redundancy-removed BP algorithm based on the fact that the geosynchronous orbit has long synthetic time which was favorable to sub-aperture processing, The algorithm removes the redundant operations within the sub-aperture, which is equivalent to one synthetic aperture divided into two sub-apertures, and utilizes comprehensively both operation speeds of the algorithm. The simulation results show that the algorithm greatly improves the computational speed and achieves a good focus, allowing a better suit for the project .