多子阵合成孔径声纳距离-多普勒成像算法  

Range-Doppler Imaging Algorithm for Multireceiver Synthetic Aperture Sonar

作　　者：张学波 王砚梅 杨家崇 沈文彦 孙海信[2] ZHANG Xuebo;WANG Yanmei;YANG Jiachong;SHEN Wenyan;SUN Haixin(Whale Wave Technology Inc.,Kunming 650000,China;School of informatics,Xiamen University,Xiamen 361005,China)

机构地区：[1]海底鹰深海科技股份有限公司,昆明650000 [2]厦门大学信息学院,厦门361005

出　　处：《电子与信息学报》2024年第5期2104-2110,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61971362,62271426);福建省自然科学基金(2020J01003)。

摘　　要：基于相位中心近似(PCA)的传统多子阵合成孔径声纳(SAS)成像方法忽略了近似误差的方位空变性,使得分布式目标的聚焦结果发生畸变。为解决这个问题,该文从收发阵元空间分置采样与相位中心近似采样的几何模型出发推导了一种考虑近似误差方位空变性的双程斜距历程,并将多子阵合成孔径声纳2维频域系统函数分解为收发分置畸变项和类收发合置项。在此基础上,采用复数相乘、插值实现收发分置畸变项的补偿,并利用距离-多普勒算法进行成像处理。相对传统方法,该文方法在整个测绘带内的近似误差更小,不会带来方位向上的位置偏移,能得到与真实目标位置一致的成像结果。Traditional multireceiver Synthetic Aperture Sonar(SAS)imaging algorithms based on Phase Center Approximation(PCA)neglect the spatial variance of approximation error in the azimuth dimension.The distortion would be introduced in the focused results of distributed.To solve this problem,a two-way slant range considering the azimuth variance of approximation error is deduced based on the geometry models of transmitter/receiver bistatic sampling and PCA sampling.The system function in the 2D frequency domain is further decomposed into transmitter/receiver bistatic deformation term and quasi monostatic term.Based on that,the complex multiplication and interpolation are adopted to compensate the bistatic deformation term.Then,the range-Doppler imaging algorithm is used to focus the targets.Compared to traditional methods,much smaller appropriation error across the whole mapping swath is obtained by using the proposed method.Besides,the position deviation in the azimuth dimension is not introduced by the proposed method.The imaging result which is identical to practical target position can be obtained.

关 键 词：多接收阵合成孔径声纳 相位中心近似 方位空变性 距离-多普勒算法 

分 类 号：TN911.7[电子电信—通信与信息系统]