一种基于STFT的脉内调制识别方法优化与分析

Optimization and Analysis of an Intrapulse Modulation Recognition Method Based on STFT

摘要:

针对频率调制信号识别概率低的问题,提出了一种基于改进的短时傅里叶变换(Short-Time Fourier Transform,STFT)的雷达信号脉内调制特征识别方法。通过增加新的信号特征参数,改进信号识别流程,提高了对频率调制信号的脉内调制识别概率。仿真结果表明,改进后的STFT算法对非线性调频信号与频移键控信号的识别效果明显优于Wigner-Ville分布和相位差分算法。

Abstract:

Aiming at the problem of low recognition probability of FM signal, animproved radar signal intrapulse modulation recognition method based on short-time Fouriertransform( STFT) is proposed, Through the improvement of signal feature parameterextraction and recognition process, the probability of intrapulse modulation recognition otthe frequency modulation(FM) signal is improved. The results show that the improvedalgorithm is better than the algorithm of Wigner-Ville distribution ( WVD) and phaselifference in recognition of nonlinear frequency modulation (NLFM) signals and frequencyshift keving (FSK) signals.