基于时频分析的相位编码信号检测及识别方法研究

摘要

低信噪比条件下（0dB）对相位编码信号的检测及识别是当前脉内特征分析中的重点和难点，基于这种原因，提出了一种基于时频分析（短时傅里叶变换）方法对信号脉冲进行检测，然后，重点论述了低信噪比条件下（0dB）对相位编码信号的调制类型识别及参数估计，根据对信号时频特征的分析，建立对信号进行检测及识别的算法模型，并给出了算法的理论依据。通过计算机仿真实验证明了该方法的有效性。%The detection and recognition to phase shift keyed （PSK） signals under the condition of low signal-to noise ratio （SNR） （0dB） are the emphasis and difficulty in present intra-pulse signa- ture analysis. On the basis of this reason,this paper proposes a method based on time-frequency a- nalysis （short time Fourier transform） to detect the signal pulse,then discusses emphatically the modulation type recognition and parameter estimation under low SNR（0 dB）,according to the anal- ysis of signal time-frequency signature,sets up the algorithm model detecting and recognizing signals, and present the theory basis of algorithm, the validity of the method is proved through com puter simulation experiment.