Underwater acoustic noise analysis based on vector phase spectrum

The vector field characters of ocean environmental noise and target radiated noise are intensively studied in this paper. Based on the vector hydrophone array, the models of coherence spectrum, phase spectrum and average complex sound intensity are established. By joint investigation of acoustic pressure and particle vibration velocity, we not only can determine whether the target signal exist in the environmental noise in a relatively short observation time, but also can realize target radiated noise measurement under the condition of low SNR, using the statistical phase difference and coherence spectrum between ocean environment noise and target radiated noise. Though lake testing and sea testing, the availability of measurement method and spectrum analysis mode are proven.