基于FIR数字滤波器的宽带噪声数值模拟

各种水声信号处理方法的性能分析和检验,都要求用数值模拟方法产生环境噪声场。分析了海洋环境噪声的空间相关性,基于噪声源的远场非相关假设,提出了一种任意空间分布宽带噪声场的数值模拟方法,该方法的关键是采用FIR数字滤波器实现高精度连续时延。对空间均匀各向同性噪声场的数值模拟结果显示,其空间相关特性及空间角度谱与理论分析基本一致,表明该方法是有效的。

Numerical Method for Simulating Broadband Noise of Arbitrary Spatial Distribution with FIR Digital Filter

The generation of noise field on computer by numerical simulation is important to performance analysis and feasibility validation for underwater acoustic signal processing methods. Based on the far field and uncorrelated hypothesis of noise sources, a numerical method for simulating broadband noise field of arbitrary spatial distribution with arbitrary array shape was proposed. The key for this method is to generate continuous time delay of high precision with an FIR digital filter, The spatial correlation characteristics and spatial angle spectrum of homogeneous isotropic noise generated with this method coincide approximately with theoretical analysis, which validates that this method is effective.