Perception and reduction of Wi-Fi interference on NavIC signals

Abstract

The NAVigation with Indian Constellation (NavIC) system contributes navigation solution all time during all weather conditions, anywhere within India and a region extending about 1500 km around India. The dual-band NavIC system uses the L5 and S bands for navigation. The existence of real-time Wi-Fi signal generates out of band radio frequency interference (RFI) to the S-band signal of NavIC. This interference has been perceived at particular frequencies of the S-band signal of NavIC and the reduction algorithm is proposed for this kind of interference which is based on wavelet packet decomposition. The exact spectral location of the RFI is identified and only affected interfered wavelet coefficients are processed to achieve interference reduction. The results have proven a significant amount of reduction of Wi-Fi interference in the S-band signal.