Analysis of interference characteristics of tow-ship noise to towed line array sonar

Because the self-noise of the tow-ship can affect the detection performance of a linear array, the beam response of the linear array to the self-noise of tow-ship in the shallow sea and deep sea environments is studied in this paper. Simulation results show that the interference of self-noise of the tow-ship occurs in the azimuth of 0°-20° in the shallow sea environment, and occurs in the azimuth of 0°-20° and 60°-90° in the deep sea environment. The reasons why the maximum beam response deviates from the end-fire direction and the interference occurs in the direction far away from the end-fire direction in the deep-sea environment are given. The sea trial data processing results prove that the self-noise of the tow-ship in the deep-sea environment indeed causes interference in the corresponding azimuth range. The results of characteristic analysis of tow-ship interference in different environments are expected to be applied to the research on self-noise of the tow-ship suppression algorithm.