An Algorithm for Passive Direction Estimation to Low Altitude Target Based on Particle Velocity Measurement
Yongfeng Dong · Acta Armamentarii · 2007
Passive acoustic direction finding is an important aspect in the acoustic surveillance.In order to detect the low altitude targets,the method for passive bearing estimation with acoustic vector sensors was presented.Based on the technique of measuring the field particle velocity,the algorithm of passive bearing estimation to low altitude target was derived.Simulating with the noise signal radiated from the real target,the results show that the algorithm can achieve direction estimation in precision of 2° when the size of acoustic vector sensor is 0.3 m and signal-noise-ratio(SNR)=0 dB.The experiment on particle velocity directivity of the acoustic vector sensors was also carried out,and gained the figures of the particle velocity directivity of the vector sensor.It has the fine spatial directivity.The experiment results also show that the method can reach a high precision,and can be used in passive acoustic direction estimation to low altitude target.Furthermore,the results of the research could be directly used in estimating the direction of the targets such as helicopters,missiles,and so on.