多基阵声测被动定位及定位精度分析

提出了一种多阵声测被动定位方法并给出了其性能分析。该方法采用单个阵估计声源方位和阵与阵间相应传声器时延的方法进行声源定位，充分利用多阵之间信号的相干特性；研究了在不同的阵间信号相干系数下的声源定位及定位精度的克拉美-罗下界。仿真表明：利用阵间相干信息的定位方法，其定位精度明显优于不利用阵间相干信息的方法；既使相干系数很小，也可明显地改善定位精度。

On Improving Accuracy of Acoustic Passive Location

Past papers on acoustic passive location of source with multiple arrays, to our best knowledge, did not exploit the existence of varying levels of signal coherence among arrays. We propose improving location accuracy by exploiting such coherence. Section 1 discusses the mathematical model which is the same as that in past papers with the important exception that signal coherence among arrays is taken into consideration. Section 2 gives eq.(14) or eq.(15) for determining Fisher matrix when signal coherence among arrays is considered. Fisher matrix, when inverted, gives the Cramer Rao bound (CRB). Simulation results, as summarized in Figs.2 through 10, show preliminarily that the source location accuracy is significantly improved when signal coherence among arrays is taken into consideration in source location processing. We like to point out that four arrays can give much higher location accuracy than three arrays.