2019_programme: SURFACE NOISE CROSS-SPECTRAL DENSITY SENSITIVITY KERNEL FOR SOUND SPEED PERTURBATION

• Session: 06. Underwater Noise - Modelling and Measurements
  Organiser(s): Gavrilov Alexander, Skarsoulis Emmanuel, Taroudakis Michael
• Lecture: SURFACE NOISE CROSS-SPECTRAL DENSITY SENSITIVITY KERNEL FOR SOUND SPEED PERTURBATION
  Paper ID: 745
  Author(s): Zheng Guangying, Shao You, Wang Ningxin
  Presenter: Zheng Guangying
  Presentation type: oral
  Abstract: As an interference of ocean acoustic channel, ocean ambient noise affects the detection performance of sonar systems. The optimization design of a sonar array can improve the detection performance of a sonar system by studying the spatial characteristics of the ocean’s ambient noise field. One of the main factors affecting the spatial characteristics of surface noise fields is the sound speed change caused by mesoscale ocean phenomena and the changes of temperature. This work derived the surface noise cross-spectral density sensitivity kernel for sound speed changes. Moreover, the effects of sound speed changes on cross-spectral density were analyzed. Numerical results showed that for surface noise with finite frequency, sound speed perturbations of any position in the entire observation plane would lead to a change in the surface noise cross-spectral density function. The cross-spectral density between two receivers in the vertical direction was the most sensitive to sound speed changes of the region between the two receivers. Additionally, the influence depended on the relationship between the wavelength and the distance of two receivers.
• Corresponding author: Dr Zheng Guangying
  Affiliation: Hangzhou Applied Acoustic Institute
  Country: China
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