Time-frequency Analysis of Frequency-Hopping Signals

The time-frequency analysis is a powerful tool for the detection of frequency-hopping(FH)signals.A clear time-frequency representation is the precondition of the parameter estimation and the separation of FH signals.To find the appropriate distribution for multiple FH signals,many time-frequency representations,include linear time-frequency representation,bilinear time-frequency distribution,bilinear time-frequency distribution by the reassignment method,different time-frequency analysis synthesis method are simulated and analyzed on the performance of time-frequency concentration and suppression cross-term interference.The results indicate spectrogram,smoothed pseudo WVD(SPWVD),reassignment distribution,nonlinear and linear time-frequency analysis method synthesis can obtain clear representations.