Spatial-time-frequency direction-of-arrival estimation algorithm based on variable core function

The classic Time-Frequency MUSIC algorithm engrosses a lot´s of calculation, and can´t adapt to signals with different time-frequency characteristics. A novel algorithm which employs variable core function propitious to different signal separately is proposed in this paper to overcome aforementioned problems. By selecting the type and length of window on time and frequency domain, this algorithm can control the side lobe power leakage of uninterested signal to below the power level of noise, and assures the accuracy of DOA estimation of interested frequency-hopping signal. This algorithm engrosses less calculation than classic TF-MUSIC algorithm and enhance the stability of spatial-time-frequency DOA estimation, but endures a slight DOA estimation performance degradation caused by calculation simplification. The simulation results confirm feasibility and superiority of the proposed algorithm.