摘要
针对差分跳频信号频带宽、跳速快、检测难的问题,在分析比较短时傅里叶变换(STFT)的基础之上,提出一种通过提取小波脊进行时频分析和参数估计的信号检测方法。该方法的检测效果明显优于短时傅里叶变换,当信噪比大于-7 dB时,在不要求高采样率的情况下,对于差分跳频信号的参数估计是有效的。
In view of the problem of wide frequency band, high hopping speed and hard detection of differential frequency hopping（DFH） signal, a detection method based on time -frequency analysis and param- eters estimation by extracting wavelet ridge is presented through comparing and analyzing the detection method using short time Fourier transform（STFT）. Detection and parameters estimation performance of this method obviously outperforms that of the method using STFT. If over - sampled rate is not required, the method is robust when the SNR is larger than -7dB.
出处
《电讯技术》
2008年第3期86-90,共5页
Telecommunication Engineering
关键词
差分跳频
信号检测
小波变换
短时傅里叶变换
参数估计
DFH （ differential frequency hopping）
signal detection
wavelet transform
STFT
parameter estimation
