结合稳健中国余数定理的合成孔径声呐多子带运动补偿算法  

Motion compensation algorithm with multiple subbands for synthetic aperture sonar via robust Chinese remainder theorem

作　　者：钟荣兴 迟骋 刘纪元[1,2] 张鹏飞 黄海宁[1,2] ZHONG Rongxing;CHI Cheng;LIU Jiyuan;ZHANG Pengfei;HUANG Haining(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;Key Laboratory of Science and Technology on Advanced Underwater Acoustic Signal Processing,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院先进水下信息技术重点实验室,北京100190 [3]中国科学院大学,北京100049

出　　处：《声学学报》2022年第4期451-460,共10页Acta Acustica

基　　金：中国科学院青年创新促进会项目(2021021);国家自然科学基金项目(62001469)资助。

摘　　要：针对运动误差过大导致基于相位的时延估计发生模糊的问题,提出了一种多子带处理和稳健中国余数定理结合的合成孔径声呐运动补偿方法。该方法利用前后两帧回波在多个子频带上的相位差获得模糊时延估计,再根据模糊时延之间的关联性,应用稳健中国余数定理估计真实的时延,最后通过所估计的时延对原始回波进行校正。湖试数据处理结果表明该方法能精确补偿运动误差对成像的影响,进行运动补偿后,包裹目标成像结果的方位向虚假目标被有效消除,且目标的轮廓也变得更加清晰;对线缆目标的成像结果进行斜距向剖面分析,剖面图的-3 dB宽度由运动补偿前的9.05个像素点缩小为运动补偿后的2.06个像素点,线缆目标的聚焦程度明显增强。A synthetic aperture sonar motion compensation method combining multiple subbands processing and robust Chinese remainder theorem is proposed to solve the problem that the phase-based time delay estimation is ambiguous due to excessive motion errors.Ambiguous time delay estimations obtained from phase difference between successive pings on multiple subbands.Subsequently,according to the relevance between ambiguous time delay estimations,the robust Chinese remainder theorem is applied to estimate the true delay.Then,the raw echo can be corrected by the estimated time delay.The field experiment results show that the proposed method can accurately compensate the influence of motion errors on imaging.After motion compensation,false targets in azimuth of package-target imaging results are effectively eliminated,and the contour of target becomes clearer.Analyze the slant-range profile of the imaging results of the cable-target,the-3 dB width of the profile is reduced from 9.05 pixels before motion compensation to 2.06 pixels after motion compensation,the degree of the imaging focus of the cabletarget is significantly enhanced.

关 键 词：运动误差 运动补偿 时延估计 合成孔径声呐 剖面分析 虚假目标 精确补偿 数据处理结果 

分 类 号：U666.7[交通运输工程—船舶及航道工程]