DOA estimation method for broadband sound sources based on multipath characteristics of shallow sea channels

Abstract

Abstract In order to improve the accuracy of direction of arrival (DOA) estimation and reduce the interference caused by multipath characteristics, this paper proposes an improved algorithm that can effectively suppress interference and improve the accuracy of direction estimation on the basis of the complex acoustic intensity target direction estimation method. The method first synthesizes the broadband pulse signal with the frequency domain acoustic pressure broadband, and after passing the synthesized signal through the channel, does the Fourier transform on it for time-frequency analysis, then does the Warping transform on the signal, separates and extracts the signal of each order of the simple positive wave to get the signal in the time domain condition, and then passes the obtained time-domain signal through the vector hydrophone separately to get the complex acoustic intensifier of the corresponding signal in the frequency domain, and finally passes the obtained Finally, the DOA estimation is carried out to obtain the average value of the complex acoustic intensity to obtain the azimuth angle.Compared with the traditional method, the proposed method can effectively suppress the interference caused by multipath characteristics and improve the accuracy of DOA estimation. Finally, the accuracy and effectiveness of the proposed method are verified by simulation and experimental data.