论文部分内容阅读
本文研究电子对抗中射频调制信号瞬时特征提取方法。对于高信噪比(SNR)信号(SNR≥15dB),采用射频信号中频直接采样和抽取、内插方法完成信号的IQ分解和恢复;并计算信号瞬时包络和信号相位主值序列;利用信号相位解混响算法和改进的基于相位多项式系数估计的信号瞬时频率最小方差算法估计信号瞬时解混响相位和瞬时频率。文中给出具体算法描述和计算机模拟结果,利用文中的方法可以有效估计射频调制信号的瞬时特征。
In this paper, we study the method of instantaneous feature extraction of RF modulated signals in electronic warfare. For the high signal-to-noise ratio (SNR) signal (SNR≥15dB), the IF signal direct sampling and extraction of the RF signal is adopted, and the IQ decomposition and recovery of the signal is completed by the interpolation method; the signal instantaneous envelope and the signal phase main value sequence are calculated; Phase de-reverberation algorithm and improved instantaneous frequency minimum variance algorithm based on phase polynomial coefficient estimation to estimate instantaneous de-reverberation phase and instantaneous frequency of signal. In this paper, the specific algorithm description and computer simulation results are given. By using the method in this paper, the instantaneous characteristics of RF modulated signals can be effectively estimated.