Tracking the moving sound target based on distributed microphone pairs

The algorithm of tracking and localizing a single rapid moving sound target, based on distributed microphone pairs, is presented in this paper. The time-delay-difference values of each microphone pair can be estimated by the methods of generalized cross-correlation. And then, the distance difference between target and the microphone pair can be calculated. When the target is in the far field of the microphone pair, the target´s direction of arrival can be gain. However, the error of the angle is determined by the sample frequency, interval of microphone pair, and precision of time delay difference. Therefore, it is difficult to gain the acceptable position parameter of the target by the multi-angles of multi-microphone pairs. A search method is presented by multi-distance difference between target and the microphone pairs in this paper. Tens microphone pairs are placed in one area with 500*500 meters in the simulation. The target´s trajectory is a haphazardly curved path, and its linear speed is about 20 meter per second. The coordinate error is less than 10 meters. The results of the simulation show the algorithm is effective and has high performance.