基于实测噪声信号的舰船辐射噪声重构

摘要

为得到逼真的舰船辐射噪声的仿真数据,通过对实测噪声数据作谱估计得到其频谱特性,同时提出了一种基于实测舰船辐射噪声信号来实现舰船辐射噪声线谱与连续谱同时重构的方法,即利用窗函数法设计出一个具有与其频谱特性相一致的特定幅频响应的FIR滤波器,再将高斯白噪声通过该FIR滤波器实现舰船辐射噪声信号重构.仿真结果表明,该方法能够较真实地重构舰船辐射噪声.其结果可作为半实物仿真试验信号源.%In order to achieve the lifelike simulation signal of ship radiated noise, the power spectrum of the noise is obtained via spectral estimation of measured noise, a method for line and continuous spectrum of ship radiated noise reconstruction as a whole based on measured ship radiated noise is proposed. White noise and an FIR filer were used to apply the reconstruction of noise. The FIR filter possess a special frequency response to match the frequency-domain feature of the noise is designed using window function method. The reconstruction single of the noise is gained using this method. It is show that the method is effective, the line spectrum and continuous spectrum can be gained at once. The result can be used in simulation of the hardware-in-the-loop as a signal source.