基于非停走停及方位非均匀采样的多接收阵合成孔径声纳CS成像算法

A chirp scaling imaging algorithm with non-uniform sampling in azimuth and without approximation of stop-and-hop for multiple-receiver synthetic aperture sonars

针对采用多接收阵技术的合成孔径声纳(SAS)成像中普遍存在的不满足停走停假设和方位向采样非均匀等问题,在深入分析了停走停假设和方位向的非均匀采样对成像造成影响的基础上,给出一种可用于方位向非均匀采样多接收阵合成孔径声纳的chirpscaling(CS)成像算法,它较为精确地补偿了非停走停模式带来的相位误差,因而适用于宽测绘带远距离SAS成像。仿真和试验均证明了该方法的有效性。

In consideration of the fact that in synthetic aperture sonar （SAS） imaging, using the technology of multiple-receiver will usually bring the problems of non-uniform sampling in azimuth and unfitting the approximation of stop-and-hop, this paper gives a robust chirp scaling （CS） imaging algorithm for multiple-receiver synthetic aperture sonars after analyzing the non-uniform sampling issue in azimuth and the approximation of stop-and-hop. This algorithm can compensate the phase error introduced by the approximation of stop-and-hop to a certain extent, so it can be used in SAS imaging with wide swath. The simulation and trial results show the validity of this method.