DOA estimation and network sorting based on STFD&SCMUSIC of multi-FH signal

In order to use the spatial characteristic parameter of frequency hopping (FH) signal to realize FH sorting, an FH signal DOA estimation algorithm based on STFD&SCMUSIC is proposed in this paper. Firstly, extract the effective hop of signal from time and frequency domain and establish the spatial-time-frequency distribution matrix of this hop; then construct the SCMUSIC spatial spectrum using descending dimension method of noise sub-space based on MUSIC algorithm; finally realize fast DOA estimation through half-spectrum searching so that FH sorting can be achieved using DOA information. At the same time, the time-frequency map is amended via morphological filtering method in order to enhance performance of low SNR algorithm. Efficient extraction of hop will be implemented on amended maps. Theoretical analysis and simulation results show that this algorithm has good effectiveness and estimation performance.