Application of the partial parallel interference cancellation method in radio navigation systems

A selective partial parallel interference cancellation method was presented to eliminate the far-near effect and sky-wave interference in radio navigation systems, in which the strong interference signal judged by the statistics of the acquisition and tracking output was selected and cancelled, thereby improving the acquisition performance on the weak navigation signals of the navigation receiver. The structure of the algorithm and theoretical analysis were given. The simulation results show that the selective partial interference cancellation method can eliminate the far-near effect and sky-wave interference existing in radio navigation systems, and improve the acquisition performance of the navigation receiver and effectively eliminate the blind work area of the navigation receiver. The hardware circuit was completed with the field programmable gate array technique and the experiment results show that the proposed method can improve the signal-to-noise (SNR) of the weak signal effectively and eliminate the far near effect and the sky-wave interference.