ELoran Receiver Sky-ground Wave Recognition Based on MUSIC Algorithm

In view of the fact that the conventional eLoran receiver sky-ground wave recognition method can not effectively utilize the signal energy, according to the characteristics of the eLoran sky-ground wave frequency domain signal mathematical model, a sky-ground wave recognition method based on multiple signal classification (MUSIC) algorithm is proposed. This method converts the problem of time delay estimation into the problem of spectrum estimation, and then uses the MUSIC algorithm with high spectral resolution to realize the super-resolution estimation of eLoran sky-ground wave time delay. The feasibility of time delay estimation based on single measurement data is analyzed. The performance of MUSIC algorithm applied to single measurement data is simulated and tested. Simulation results show that the proposed method has super resolution capability for eLoran sky wave time delay estimation.