基于非线性系统的小信号检测算法研究

Research on Small Signal Detection Algorithm Based on Nonlinear System

本文研究了通信数据链系统的微弱小信号增强与接收检测算法。为了提升通信数据链系统中信号的接收性能,在低信噪比条件下,提出基于非线性系统的小信号检测算法。在非线性系统中,适当强度的噪声在一定程度上会增强输出信号的幅值,从而实现在强大的噪声背景环境下对微弱小信号的增强和检测功能。本文着重研究了非线性系统中的双稳态系统,分析了通信数据链系统中的MSK信号输入到双稳态系统中,利用Matlab仿真出输入非线性系统前后的信号时域频域波形图,进而分析了基于通信数据链系统的小信号增强与检测算法性能。Matlab仿真结果表明,本文提出的算法可以有效改善低信噪比条件下的通信信号接收性能,在信号处理与接收领域有着重大的应用前景。

In the paper,we research the small signal enhancement and receiving detection algorithm based on the communication data link system.In order to improve the reception performance of the signal transmitted in the communication data link system,a small signal detection algorithm based on the nonlinear system was proposed under the condition of low SNR.In nonlinear system,appropriate intensity of noise can enhance the amplitude of the output signal on a certain extent,which can realize the functions that enhancing and detecting small signal in the environment of strong background noise.In the paper,we analyze the MSK signal in the nonlinear bistable system based on data link system,using Matlab simulation to make out the waveform diagram of the output signal in time domain and frequency domain,then analyze the performance of the small signal enhancement and detection algorithm based on data link system.Matlab simulation results show that the algorithm proposed in the paper can effectively improve the reception performance of communication signals under the condition of low SNR,and has a great application prospect in the signal processing and receiving field.