基于双基模型的多接收阵合成孔径声纳CS成像算法  

A chirp scaling algorithm for multi-receiver SAS imagery based on bistatic model

作　　者：张学波[1] 唐劲松[1] 张森[1] 

机构地区：[1]海军工程大学水声技术研究所,武汉430033

出　　处：《高技术通讯》2013年第9期927-932,共6页Chinese High Technology Letters

基　　金：国家自然科学基金(61072092;61101205)资助项目

摘　　要：针对多接收阵合成孔径声纳(SAS)的传统快速成像方法较难实现高阶空变系统误差补偿的问题,将多接收阵SAS看成多个双基地声纳的组合,并利用根式的等价变换和泰勒级数方法,提出了一种充分考虑"停-走-停"近似的多接收阵SAS线频调变标成像算法。基于多接收阵SAS方位空不变和距离空变特性,在二维空域内研究了距离延迟误差,结果表明,基于双基模型的成像方法能够满足合成孔径高分辨成像。仿真和实测数据处理结果进一步验证了该方法的有效性。In view of the problem that it is hard for conventional fast imaging algorithms for multi-receiver synthetic aper- ture sonar（SAS） systems to compensate for high-order and space-variant system errors, a new chirp scaling（CS） im- aging algorithm for multi-receiver SAS, which fully considers the influence of the ＂stop-and-hop＂ approximation, was proposed based on the regarding of a multi-receiver SAS as a combination of many bistatic sonars and the usage of the equivalent transformations of the radical function and Taylor series. By using the SAS characteristics of space- invariance in azimuth dimension and space-variance in range dimension, the range propagation delay error was stud- ied in two-dimensional space domain. The error analysis results show that the presented method fully meets the re- quirements for the high-resolution synthetic aperture image formation. Further, simulated and real data were used to validate the presented method.

关 键 词：合成孔径声纳（SAS） 多接收阵 双基模型 距离延迟误差 线频调变标算法 

分 类 号：TN911.7[电子电信—通信与信息系统]