Simulation on Ship Noise Received by Shallow Water Hydrophone

Broadband noise signal radiated by a moving ship and received by a hydrophone in shallow water contains continuous spectrum, line spectrum and modulation spectrum components. Each of these components exhibits one aspect of the ship’s navigation characteristics. The modulation spectrum embodies the ship propeller’s characteristic. The continuous spectrum’s overall intensity and each frequency’s spectrum level vary according to variations in relative distance. Line spectrum frequencies also vary with respect to variations in relative radial speed owing to the Doppler frequency shift. Additionally, inclined interference striations in shallow water acoustic field are presented in the time-frequency spectrogram. This paper proposes a method to simulate moving ship radiated noise signals in shallow water. Simulation experiments show that the simulated signals embody the aforementioned ship’s dynamic characteristics in both time and frequency domains, as well as the human auditory system. The method may be used to generate simulated input hydrophone signals for applications including passive sonar detection, sonar target identification, etc.