Research On Ship Azimuth Estimation Technology Based On Single Vector Hydrophone

The sound field is both a scalar field and a vector field.The target information and environmental information are included.The vector hydrophone is composed of two parts: the sound pressure sensor and the vibration speed sensor.Therefore,the scalar information and vector information in the sound field can be obtained at the same time.It lays the foundation for the processing of joint information using sound pressure and vibration speed.Therefore,vector hydrophone technology is becoming more and more important.In this paper,the vector hydrophone is selected as a research tool,and the ship orientation estimation method based on single vector hydrophone is studied.When the ambient noise is isotropic noise,there is no correlation between the sound pressure and the particle vibration velocity.In this case,if the ship noise signal is a coherent signal,there is a correlation between the sound pressure of the target signal and the vibration velocity of the particle,in which the average sound intensity method can be used to estimate the orientation of the ship.When the ship’s radiated noise is in the form of a cable spectrum,the position of the ship can be estimated using the DEMON line spectrum.When the ship’s noise is a wideband signal and the interference contains linear components,the histogram method can be used to estimate the ship’s position.When the ship’s noise contains line spectrum components and the interference is a broadband spectrum,the weighted histogram method can be used to estimate the ship’s position.According to different background noise and interference,different orientation estimation algorithms are provided for selection,and corresponding computer simulation and experimental data analysis are given.