三元阵被动定位中时延差估计算法研究  

Investigation on Time Delay Difference Estimation for Three-element Array Passive Positioning

作　　者：郑恩明[1,2] 丘颜 孙长瑜[1] 陈新华[1] 

机构地区：[1]中国科学院声学研究所 [2]中国科学院大学 [3]91388部队

出　　处：《电子与信息学报》2014年第3期639-644,共6页Journal of Electronics & Information Technology

基　　金：国家海洋公益性行业科研专项经费项目(201005001)资助课题

摘　　要：为了提高三元阵被动定位精度,该文对互谱法时延差估计进行了研究改进。改进算法解决了单独采用互谱法进行时延差估计存在的相位模糊问题,增强了互谱法在实际应用的鲁棒性。该算法所得时延差由周期值和修正值构成;时延差周期值是通过对阵元间互谱信号进行时延补偿所得,时延差修正值是采用最小二乘法对补偿后互谱信号拟合所得。理论分析和实验结果表明:采样率为310 Hz时的时延差估计精度可以达到610 s-,该方法具有很强的实用性。能有效提高三元阵被动定位精度。In order to improve the passive positioning accuracy of three-element array, a modified cross-spectral algorithm is proposed for time delay difference estimation. The improved method solves phase ambiguity issue in conventional the cross-spectral method, and enhances the robustness of cross-spectral method in practical application. The time delay difference obtained with the proposed method contains cycle value and correction value. The cycle value is obtained by compensating the phase of cross-spectrum signal, and the correction value is obtained by applying least-squares to cross-spectrum signal after compensation. Theoretical analysis and experiment results show that this method can achieves the evaluation accuracy of 610？ s for sampling rate of 310 Hz , and has a strong practicability. Therefore it can effectively improve the positioning accuracy of three-element array passive positioning.

关 键 词：信息处理技术 被动定位 时延差估计 

分 类 号：TB565[交通运输工程—水声工程]