Analysis of vertical line array spatial gain affected by wind-driven ambient noise in deep ocean

Abstract

The noise spatial correlation coefficient between two array elements deployed vertically in real deep ocean environment is not consistent with that in isotropic ambient noise field because of surface-distributed wind driven noise sources. Therefore, it is necessary to analyze the performance of vertical line array spatial gain properly. A method for modeling wind-driven ambient noise field is described. By using the described method the noise response on array hydrophones can be calculated. Furthermore, the formula of array spatial again in nonisotropic ambient noise field is developed. Spatial correlation coefficient between two elements are simulated with the described method and compared with that in isotropic noise field. And simulations are performed to analyze the difference of vertical line array spatial gain between nonisotropic noise field and isotropic noise field. Besides, the array spatial gain as a function of element number is also analyzed.