摘要
针对电子对抗的实际应用,提出了一种精确估计跳频信号跳速的方法。利用短时傅里叶变换分析跳频信号,得到其时频表示,再利用小波变换提取该时频表示的边沿信息,进而利用谱分析实现了跳速的精确估计。该算法完全避免了频谱交叉项的影响,理论分析证明了其可行性。仿真试验表明,在不要求高采样率的情况下,信噪比大于-5.5 dB时该算法是有效的。
To aim at the actual application of electronic countermeasures, a method for the hop rate accurate estimation is proposed for the frequency hopping （FH） signals. The FH signal with the short-time Fourier transform （STFT） is used to yield its time-frequency representation, whose edge information is abstracted by the wavelet transform （WT）, and the spectral analysis is used to implement the hop rate accurate estimation. The method can absolutely avoid the effect of the spectral cross terms, and theoretical analysis proves the algorithmic feasibility. Simulation shows that it is efficient when SNR is greater than-5.5 dB without high sampiing rate.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2006年第10期1500-1501,1537,共3页
Systems Engineering and Electronics
关键词
电子对抗
跳频
信号检测
特征提取
military electronic countermeasures
frequency hopping
signal detection
feature extraction
