Parameter Estimation of Frequency Hopping Signals under Strong Interference
Cheng Shu-hu · Telecommunication Engineering · 2014
To estimate the parameters of the frequency hopping( FH) signal in communication countermeasures,a hop duration estimation method based on the core of time-frequency and a hop timing estimation method based on partial reception of frequency hopping signal are proposed. For hop duration estimation, on the basis of short time Fourier transform( STFT),the core of time-frequency which varies with time is extracted,then the hop duration estimation is obtained according to wavelet transform and spectral analysis. For hop timing estimation,the partial reception of FH signal is adopted to avoid the strong interference,a reference signal which has the same transition information as the original signal is constructed,then a maximum likelihood estimation method is used to get the hop timing. Simulation shows that this algorithm features low computation complexity and high accuracy in time-frequency plane. The results indicate that this algorithm can estimate the hop duration and hop timing under the strong interference.