Detection of costas-encoding frequency-hopping signal based on suppressing power spectrum and pulse detection

In order to solve the problem of frequency-hopping signal detection, an improved algorithm based on power spectrum elimination and pulse detection is proposed. Firstly, judge the signal type and estimate the width of signal with the hopping frequency by STFT and pulse detection. Then, eliminate the frequency-fixed signal interfere by suppressing the signal. Finally, judge the threshold to realize the fast detection and estimate the hopping frequency. This paper is aimed at Costas-encoding frequency-hopping signals. The proposed method decreases the computation and improves the detection probability. Simulation results indicate that it can achieve a detection probability of more than 90% when SNR is above -3.7dB.