基于参考距离史的多子阵SAS成像算法  

A Imaging Algorithm Based on the Reference Range History for the Multiple Receivers Synthetic Aperture Sonar

作　　者：吴浩然[1] 张非也 唐劲松[1] 佟怡铄 WU Haoran;ZHANG Feiye;TANG Jinsong;TONG Yishuo(College of Electronic Engineering,Naval University of Engineering,Wuhan 430033,China;Research Department,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学电子工程学院,武汉430033 [2]海军工程大学科研处,武汉430033

出　　处：《电子与信息学报》2021年第3期650-656,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(41906162)。

摘　　要：为了解决现有多子阵合成孔径声呐(SAS)成像算法忽略了“非停走停”时间的孔径依赖性带来时延误差的问题,该文提出一种基于参考距离史的多子阵SAS成像算法。首先利用参考子阵与各子阵之间的平移关系,推导每个子阵的近似距离史,解决“非停走停”时间的孔径依赖性需要被近似的问题;然后将每个子阵信号搬移至相同的波束中心距离后,通过方位重构方法将欠采样的多子阵信号转变成满足采样定理的等效单基站信号,再用单基站成像算法处理得到多子阵SAS的成像结果;最后通过仿真实验和实测数据检验算法的有效性。To address the problem that the aperture-dependence of‘non-hop-go-hop’time in the existing imaging algorithm for the multiple receivers Synthetic Aperture Sonar(SAS)is ignored and brings the delay error,a imaging algorithm based on the reference range history is proposed in the paper.Firstly,the shifting relationship between the reference receiver and the other receivers is used to derive the approximated range history of every receiver,which conquer the problem of ignoring aperture-dependence of‘non-hop-go-hop’time.Then,after the echo signal of each receiver is shift to the same beam centre range,the undersampling multiple receivers signal can be transformed into the single receiver signal by the azimuth reconstruction,which can be processed by the monostatic imaging algorithm to get imaging result.Finally,the validity of proposed algorithm is tested by the simulation experiments and real data.

关 键 词：多子阵合成孔径声呐 参考距离史 相对距离偏移量 

分 类 号：TN911.73[电子电信—通信与信息系统]