随机共振技术在微弱舰船轴频电场信号检测中的应用

针对在强背景噪声中检测微弱舰船轴频电场信号的问题,提出了基于随机共振技术的检测方法.首先,介绍了随机共振利用噪声增强信号能量从而提高信噪比的基本原理,并在此基础上给出了利用随机共振检测微弱周期信号的模型.然后,将低信噪比的船模轴频电场测量数据输入到检测模型并对输出信号作功率谱分析,结果表明:随机共振技术能十分有效地从复杂背景噪声中检测出微弱舰船轴频电场信号,在微弱信号处理领域相比传统方法具有很大的优势.最后,结合检测实例,初步分析了系统参数对随机共振系统输出信号频谱分布的影响,为随机共振技术的进一步工程应用打下了良好的基础.

Application of stochastic resonance technique detecting ship's weak shaft-rate electric field signal

To solve the problem of remote detection of ship′s weak shaft-rate electric field signal in loud noise,a detection method was proposed based on stochastic resonance.Firstly,the basic principle of stochastic resonance was introduced based on which a model for detecting the weak periodic signal was presented.Then,a ship model′s shaft-rate electric field signal of low SNR was input to the detecting model and the power spectrum of the output signal was obtained.The result indicates that the stochastic resonance technique can detect the ship′s weak shaft-rate electric field signal in loud noise effectively and has much superiority over traditional methods in weak signal processing.Also,the influence of the parameters on the output power spectrum of the system was analyzed through the detection example.