摘要
阵列幅相误差校正问题是水声探测系统阵列信号处理中一个重要的研究方向。文章提出了一种基于阵列旋转的圆柱阵幅相误差有源校正方法,以提高实际应用中阵列幅相误差的校正精度,实现高精度和高空间分辨能力的波达角估计。利用阵列旋转的方法解除校正信源入射方位角与幅相误差间的耦合,完成校正源的方位校准。再结合改进的有源校正算法,通过特征分解和算术平均的方式计算得出阵列的幅相误差。所提出的方法不需要准确测量校正源的方位角,且校正过程简单,有效地解决了在实际应用中校正源方位角不准确和实验系统搭建复杂的问题。仿真和湖上实测数据分析结果表明,校正后的相位偏差小于1°,归一化电平减小约30 dB,显著提高了阵列幅相误差的校正精度,验证了文中所提方法在工程应用中的有效性。
The errors correction of array amplitude and phase is an important research direction in array signal processing of underwater acoustic detection systems.In this paper,an active correction method is proposed for amplitude and phase errors of cylindrical array based on array rotation.It could improve the correction accuracies of array amplitude and phase errors,thereby achieve high-precision and high spatial resolution of the angle estimation of arrival.According to the method,the azimuth of the correction source is calibrated firstly,with error decoupling between the incident azimuth angle and amplitude phase based on array rotation.Then,the errors of amplitude and phase of the array are calculated by eigen-decomposition and arithmetic mean algorithm.The proposed method does not require accurate azimuth angle measurement of the correction source and complex experimental system.The results of simulation and analysis of measured data on the lake show that the corrected phase deviation is less than 1°,and the normalized level is reduced by about 30 dB.The accuracies of array amplitude and phase errors correction is significantly improved.It verifyies the effectiveness of the proposed method in engineering applications.
作者
古树星
郭世旭
焦君圣
赵鹏
王月兵
GU Shuxing;GUO Shixu;JIAO Junsheng;ZHAO Peng;WANG Yuebing(Key Laboratory of In Situ Metrology Ministry of Education,China Jiliang University,Hangzhou 310018,Zhejiang,China)
出处
《声学技术》
北大核心
2025年第1期148-154,共7页
Technical Acoustics
基金
国家重点研发计划(2022YFF0607505)资助项目。
关键词
水声探测
圆柱阵
幅相误差
有源校正
旋转测量
underwater acoustic detection
cylindrical array
amplitude and phase errors
active correction
rotation measurement
作者简介
古树星(1998-),男,河北张家口人,硕士研究生,研究方向为水声探测与阵列信号处理;通信作者:郭世旭,E-mail:guoshixu@cjlu.edu.cn。
