Research on Anti-jamming Algorithm of BDS Signal in WiFi6 Environment

Bei Dou satellite navigation system (BDS for short) is original constructed to perform navigation tasks as open, global, compatible satellite system. BDS satellite signal has adjacent relationship with WIFI6 in S-band, which has great communication rate is increasingly used in urban recent years. To achieve success operating under WiFi6 environment, we have to overcome numerous challenges, which are the need for avoiding narrow-band interference caused by WiFi6. Analyzed the characteristic of WiFi6 subcarrier and BDS signal width, and built the experiment to obtain in band interference of BDS with WiFi6, we proposed in the current paper a timefrequency domain filter based anti-jamming algorithm, where the windows function in time domain added before FFT filter in frequency domain to reduce BDS signal leakage, and CFAR based detection threshold to detect narrowband interference with strong power. We carried out comparison numerical simulations and experiment on FPGA prototype using the proposed time-frequency domain filter. The result yielded in the experiment showed that the interference caused by WiFi6 is cleared and the error rate of navigation bits is returned to normal. It seems that the current technique provides an insight in improve the signal quality of BDS navigation when WiFi6 is everywhere.