摘要
为提高短基线水声定位系统的定位精度,对利用两次估计提高时延差计算精度的方法进行了理论分析、仿真和实验验证,并给出了具体的实现步骤。该方法将时延差估计值分解成了时延差初测值和时延差修正值,前者直接利用相关函数包络求解,后者与相关函数相位差之间存在映射关系,通过频域的相位差估计获得。仿真和实验的结果显示,采用这一方法能够获得很高的时延差估计精度。两步法具有很强的实用性,可以有效的提高短基线水声定位系统定位精度。
In order to improve the positioning accuracy of short-base-line underwater acoustic positioning systems, a two-step algorithm for estimating time-delay difference value is analyzed theoretically and verified by simulation and experiments, and the implementing procedures are presented. In the algorithm, time-delay difference value is regards as combination of the value of initial time-delay difference testing and the value of time-delay difference modifying. The former is obtained from the peak value of envelopes of correlation function; the latter is calculated by phase difference estimation in frequency domain, because mapping exits between time-delay difference modifying value and phase difference value. The simulation and experimental results show that this method achieves high accuracy for time-delay difference estimation. The two-step algorithm is practical and can improve the positioning accuracy of short- base-line underwater acoustic positioning systems effectively.
出处
《声学学报》
EI
CSCD
北大核心
2013年第2期153-159,共7页
Acta Acustica
