Signal Joint Parameter Measurement and Identification Method Under Low Signal-to-Noise Ratio
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-to-noise ratio(SNR)condi-tions is proposed based on the instantaneous phase difference feature of signals.The proposed method employs a non-coherent accumulation detection algorithm to improve the accuracy of time-domain parameter measurement under low SNR,ob-taining 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 engineer-ing implementation.Simulation and experimental results validate its high measurement accuracy and identification proba-bility for binary phase shift keying signals,linear frequency modulated signals,and single carrier frequency signals.
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