自适应时延估计算法在被动声定位系统中的应用

在被动声定位系统中，定向精度受到时延估计精度、阵列间距大小和声波传播速度变化等的影响，特别是对时延估计精度的要求较高。分析了传统时延估计算法在时延估计上的局限性，采用自适应参量模型算法实现了低采样频率下的高精度时延估计。完成了算法仿真，编制了DSP处理程序，通过消声室缩比实验验证，表明估计精度和运算时间可满足实际使用的要求。

The Application of Adaptive Time Delay Estimation in Passive Acoustic Direction Finding System

In passive acoustic direction finding system, precision of direction estimate is greatly affected by the precision of time delay estimation, array aperture, the variation of underwater sound velocity, especially by the precision of time delay estimation. After analyzing the limitation of traditional time delay algorithm, we achieved high precision time delay estimation with low sampling frequency by using adaptive parameter model algorithm. We finished the computer simulations of this algorithm and a combination debug in DSP. Results of the scaling experiment in anechoic chamber indicate that both the estimation precision and computational complexity can satisfy the practical demand.