低信噪比下信号联合参数测量与识别方法

Signal Joint Parameter Measurement and Identification Method Under Low Signal⁃to⁃Noise Ratio

针对传统的辐射源信号参数测量方法精度不高、工程实现困难且需要单独的信号调制识别步骤,本文基于信号的瞬时相位差特征提出了一种适用于低信噪比下的信号联合参数测量与识别方法,并进行了工程实现。该方法运用非相参累积检测算法提高低信噪比时域参数测量精度,获取信号瞬时相位差特征,联合测量并识别载频信息和调制方式,算法计算复杂度低、便于工程实现。经仿真和实测结果验证,对二相编码信号、线性调频信号和单载频信号有较高的测量精度和识别概率。

The traditional methods for parameter measurement of radiation source signals have problems such as low accuracy,engineering implementation challenges,and the need for separate signal modulation and recognition steps.In this paper,a method for joint measurement and identification of signals under low signal-tooise ratio(SNR)conditions is proposed based on the instantaneous phase difference feature of signals.The proposed method employs a nonoherent accumulation detection algorithm to improve the accuracy of time-domain parameter measurement under low SNR,obtaining the instantaneous phase difference feature of the signal.It jointly measures and identifies the carrier frequency information and modulation methods.The algorithm has low computational complexity,making it convenient for engineering implementation.Simulation and experimental results validate its high measurement accuracy and identification probability for binary phase shift keying signals,linear frequency modulated signals,and single carrier frequency signals.