双目标对时延估计被动声定位的影响

Acoustic-passive Direction Estimation Using Time Delay Estimation Under Two-target Situation

空气中针对单目标的声被动定向方法已相当成熟并在实际中得到应用,但在实际中往往存在双目标同时出现的情况,文中着重研究此种情况下对单目标方位估计的影响。针对两个目标是同一类声源的情况,利用仿真实验研究了两个目标信号在各种不同能量比(信噪比)的情况下,方向估计的误差随着两个目标之间的夹角变化的情况。实验表明,在接收到的干扰机与目标信号的能量比较小时,干扰机对估计结果的影响是相当小的,而估计误差随两个目标间夹角的增大而增大。

A new estimator for a four - element plane array is introduced in order to get acoustic - passive direction estimation of targets. We concern much about the performance of the estimator under a two -target situation. In this paper, the two targets concerned are of the same type of acoustic source. Under different signal to interfere ratios, we propose the change of the precision of the direction estimation as the angle between the two targets changes. Our study was done under the real time Warfield situation, and may help the design of small acoustic - passive direction estimation arrays.