Blind Detection of Frequency Hopping Signal Using Time-Frequency Analysis

The paper proposes a detection algorithm for the frequency hopping signals in intricate electromagnetic environment using time-frequency analysis. To overcome the difficulty brought by the unsteady distribution and energy fading, an adaptive time-frequency local threshold is applied to preprocess the spectrogram; And by the methods such as spectrogram modification and time-statistic, most of the interferences are successfully removed. And finally the detection of FH signals is realized.