阵列增益下的最大听觉距离及算例分析

Calculation Example Analysis of Maximal Audio Distance under Array Gain

被动声定位技术已成为战场目标定位的重要手段,人-机一体化头盔式"电子哨兵"系统能够解决阵列信号处理低信噪比性能下降及人耳听觉距离有限的缺点。作为系统研发的理论基础,从声传播方程出发,研究了考虑阵列增益条件下的最大听觉距离。基于声传播方程,分析了声传播损失的计算方法,探讨了自由场情况下和存在阵列支撑物情况下阵列常规增益和阵列超增益的算法,最后通过算例对阵列处理提高人耳听音距离进行了说明,为人-机一体化"电子哨兵"系统研发提供了理论依据。

Passive acoustic localization technology has become an important method for battle field target localization. The new type of head-mounted electronic sentinel system based on human-machine combination and passive acoustic localization can overcome the performance fall in low SNR of array signal processing and the limited auditory distance. As a theoretical basis for the development of the proposed system,the largest auditory distance is studied starting from acoustic propagation equation under the condition of considering the array gain. The algorithm of calculating acoustic propagation lose is analyzed based on acoustic propagation equation. The array gain and array supergain using array in free field and array with baffles are investigated. The improvement of auditory distance using array signal processing technology is illustrated by numerical examples,which provides a theoretical basis for the development of electronic sentinel system based on human-machine combination.