强干扰环境下水声时延估计技术研究  

Time of Arrival Estimation in Presence of Strong Interference

作　　者：李海鹏 孙大军 郑翠娥[3] LI Haipeng;SUN Dajun;ZHENG Cui’e(Acoustic Science and Technology Laboratory,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University),Ministry of Industry and Information Technology,Harbin 150001,China;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学水声技术重点实验室,哈尔滨150001 [2]海洋信息获取与安全工信部重点实验室(哈尔滨工程大学),哈尔滨150001 [3]哈尔滨工程大学水声工程学院,哈尔滨150001

出　　处：《电子与信息学报》2021年第3期873-880,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61701132);黑龙江省自然科学基金(YQ2019D003,JC2016013)。

摘　　要：水声定位系统是现代深海作业必备的高精度水下定位装备,精确的时延估计是实现高精度水声定位的基础,但由于信号远距离传输以及强干扰的影响,水声定位系统时延估计精度较低。针对此问题该文提出一种基于子空间理论的宽带强干扰抑制方法,首先通过贝叶斯信息量准则估计子空间维度,然后推导了不同信号假设下的概率密度函数,求解未知参数的最大似然估计,构造广义似然比并通过最优匹配广义似然比检测法估计与期望信号最匹配的子空间,然后以此构造空间投影算子对接收数据进行线性投影,最终抑制干扰和噪声,提高时延估计精度。仿真结果表明该方法能够有效抑制干扰和噪声的影响,提高定位系统时延估计精度。The underwater positioning system is the essential and necessary equipment for modern deep-sea operations.Accurate time delay estimation is the basis for achieving high-precision localization.However,the performance of time delay estimation will decrease due to the long-distance transmission and strong clutter.To solve this problem,a novel interference suppression method based on the subspace theory is proposed.The dimension of the subspace is estimated using Bayesian information criterion at first,and the probability density function under different assumptions are then derived by estimating the unknown parameters to construct the generalized likelihood ratio.Finally,the most suitable subspace may be estimated using the optimal matching generalized likelihood ratio detection method.The projection operator is constructed to linearly project the received data,suppressing the interference and noise as a result of improving the accuracy of time delay estimation.The simulation results show that the proposed method can effectively suppress the influence of the clutter and improve the estimation accuracy of the time-delay.

关 键 词：水声时延估计 子空间 最大似然估计 广义似然比 

分 类 号：TN929.3[电子电信—通信与信息系统] TN911.4[电子电信—信息与通信工程]