Using aero-acoustic vector sensor for acoustic measurement and target direction finding

Abstract

In order to estimate the direction of the ground target intruded upon the special region, the acoustic system composed of aero-acoustic vector sensor (AVS) is designed, and a new method of direction finding based on estimation of the sound intensity is proposed in this chapter. By utilizing AVS to measure acoustic pressure as well as the acoustic particle velocity, the sound intensity is estimated, and the sound intensity represents the direction of the target or propagating part of an acoustic field thus indicating the direction of arrival (DOA) of a received signal. Simulating with the noise signal radiated from the real target, the results show that the algorithm can achieve direction estimation precision of 2.5 when the size of AVS is 0.28 m and signal noise ratio (SNR) 0 dB. From experimental research on sound intensity of the AVS, the results indicate that the method can reach a high precision; the maximum standard deviation (STD) is <3. The technique studied in the chapter could be absolutely used to estimate the direction of the ground target and put forward a new approach to acoustic detection of the low altitude target such as helicopters, pilotless aircrafts, and so on. © 2014 Springer Science+Business Media New York.