摘要
为解决水声被动定位算法中由于互相关峰模糊导致的信号到达时间差估计错误问题,该文提出一种基于水声传播特性的解模糊算法。利用水声传播射线模型研究了互相关峰模糊现象的物理成因,得到了浅海信道条件下多路径传播形成的多个互相关峰的分布规律。根据仿真得到的不同路径之间的相关峰幅度和时延特性,提出了基于互相关峰分辨及稳定相关峰跟踪的解模糊算法。对海上采集的试验数据进行了处理,结果表明该算法能够有效地纠正互相关峰模糊导致的到达时间差估计错误。
In order to correct the signal time-difference of arrival estimation errors introduced by correlation peaks ambiguity in underwater acoustic passive localization, an ambiguity elimination algorithm is proposed based on the propagation characteristics of underwater sound. The physical essence of correlation peaks ambiguity is studied using the ray model of underwater acoustic propagation. Distribution disciplines are then summed up for correlation peaks caused by multi-path propagation in shallow sea acoustic channel. The amplitude and time-delay characteristics of correlation peaks between different paths are analyzed by simulations, and the ambiguity elimination algorithm is proposed based on correlation peaks classification and stable peaks tracing. The algorithm is used to estimate the time-difference of arrival for signal acquired in sea trial. Processing results show that estimation errors can be effectively corrected with the proposed algorithm.
出处
《电子与信息学报》
EI
CSCD
北大核心
2013年第12期2948-2953,共6页
Journal of Electronics & Information Technology
基金
国家自然科学基金(11104029)资助课题
关键词
水声被动定位
水声传播射线模型
达到时间差估计
相关峰模糊
Underwater acoustic passive localization
Ray model of underwater acoustic propagation
Time-difference of arrival estimation
Correlation peaks ambiguity
