PSK信号的调制参数估计与识别

针对PSK信号，分析了BPSK信号和QPSK信号的谱相关特性，并通过计算机仿真了这2种信号的谱相关平面图（即循环频率一频率双频三维图），提出了利用循环谱相关函数的截面图估计BPSK信号和QPSK信号的调制参数（即载频和码元速率）并识别这2种信号的方法．搜索最大峰值可估计信号的载频，计算最大峰值与次大峰值差可估计出信号的码元速率，通过仿真得到载频估计与码元速率估计的归一化均方误差，并根据谱相关特性设置阈值识别出BPSK信号和QPSK信号．该方法在低信噪比下也可达到很好的识别估计效果，适于雷达电子对抗信号识别估计的应用．

Modulation parameter estimation and recognition of PSK signals

For PSK signals, spectrum related characteristic of the BPSK signal and QPSK signal is analyzed, and the spectrum correlation plan of these two kinds of signal （cycle frequency- frequency three-dimensional chart） is simulated by computer. A method is proposed to estimate the modulation parameters of the BPSK signal and QPSK signal-carrier frequency and chip-rate, and to identify these two signals by using cyclic spectral correlation function. We can estimate carrier frequency of signals by searching the maximum peak value and estimate chip-rate by calculating the difference between maximum peak value and the secondary large peak value. And the NMSE of carrier frequency estimation and chip-rate estimation is simulated And we can identify the BPSK signal and the QPSK signal according to the spectral correlation characteristics. This method can achieve very good estimation and recognition effect in low SNR environment, and is suitable for application of signal identification and estimation in radar electronic warfare. ,