基于宽带无失真波束形成的空气中多声源被动定向方法

DOA estimation of multiple sources in the air based on wideband distortionless beamformers

将宽带无失真波束形成技术与基于时延的声被动定向方法相结合,针对小孔径基阵,提出了对多个声源的定向方法。该方法把整个观测空间分为若干个不同的测量区域,而后利用基于时延的定向方法定向处于不同测量区域的声源。此方法使基于时延的声被动定向方法具有了一定的多源分辨能力,对提高和改进声被动探测系统在实际使用中的性能有重要意义。仿真计算和空气实验验证了本文所提方法的正确性和实用性。

A method of direction-of-arrival （DOA） estimation for multiple source using a small-aperture array is developed in this paper. The first step is to form 4 beams using wideband distortionless beamforming method, which divides the whole space into 4 separate regions. Then, beam outputs are calculated and regarded as signals received by the reference point. Finally, time-delays between the signals received by the reference point and each element of the array are estimated by the generalized correlation method, and then sources in each region are localized by the time-delay-based DOA estimating method. Effectiveness of the proposed method is verified by computer simulation and air experiment.