摘要
针对跳频信号的非平稳性和频率的时变性,文章采用短时傅里叶变换(STFT)对跳频信号进行了分析,并基于STFT对跳频信号的跳频周期、跳频时刻和跳频频率等参数进行了估计。最后分析了窗宽对参数估计的影响。仿真结果表明,采用STFT方法可以有效估计出跳频信号的特征参数,为通信侦察系统进行跳频信号分选打下了良好的基础。
Aiming at the nonstationary and frequency variability of frequency-hopping signals,STFT is taken to analyse frequency-hopping signals.The period,time and frequency parameters of frequency-hopping signals is estimated based on STFT.Lastly,the influence of width of window to parameter estimation is analysed.The result of simulation shows that the characteristic parameters of frequency-hopping signals could be estimated by STFT,which is the foundation of HF signal classifying by communication scout system.
出处
《舰船电子工程》
2011年第10期73-74,176,共3页
Ship Electronic Engineering
关键词
跳频信号
跳频周期
跳频时刻
跳频频率
窗宽
frequency-hopping signals
frequency-hopping period
frequency-hopping time
frequency-hopping frequency
width of window
