针对类信号的脉内调制识别问题,提出了一种基于短时傅里叶变换(STFT)和瞬时累加自相关的快速雷达信号脉内 调制识别方法。采用由粗到细的识别方案,依据累加STFT 频谱带宽将信号分为调频和调相信号。采用时域累加瞬时自 相关识别BPSK和QPSK信号,利用STFT频谱的时域特征识别LFM和NLFM信号,经仿真实验分析,在较低信噪比下可 正确实现信号识别,该方法适于FPGA的快速实现。

To solve the problem in signal pulse modulation recognition, a fast radar pulse modulation recognition method was proposed based on STFT and instantaneous cumulative autocorrelation. An identification programme from coarse to fine was used in this method. FM signal and PM signal was distinguished by the spectrum bandwidth of cumulative STFT,BPSK signal and QPSK signal was identified through instantaneous cumulative autocorrelation,LFM signal and NLFM signal was discriminated by the time-domain characteristics of STFT spectrum. Simulation analysis verified that this method performance well in low SNR. Fast implementation on FPGA was easily aquired.