水下目标辐射噪声中单频信号分量的检测：数值仿真

The detection of single frequency component of underwater radiated noise of target:digital simulation

继续深入讨论强干扰背景噪声下单频信号分量的检测问题。根据理论分析进行了一系列的数值仿真,验证了理论中关于处理增益与时间成正比的结论,在存在频率漂移时,分段DFT分析的宽容特性。同时讨论检测系统的参数选择问题,包括采样间隔、分段DFT的长度、频率分辨力、单频信号分量的频率漂移对检测系统性能的影响。

The detection problem of weak single frequency component in the background of strong noise is discussed. Based on the theoretical analysis, a series of digital simulation are carried out to verify the theoretical conclusion, including： the system gain, the robust performance of segment DFT analysis in the case of existence of frequency shifting. The selection principle of various parameters is discussed, including sampling duration, length of segment DFT, frequency resolution etc. The effect of frequency shifting on the system performance is also illustrated.