Demonstrated Interference Detection and Mitigation with a Multi-frequency High Precision Receiver

GNSS interferers come in many forms and classifications. Some are intentional, purpose built in-band jammers, but many are unintentional, originating from sources such as radio, TV, wireless communication and radars. Unquestionably, interference to GNSS is increasing in an increasingly wireless world and as GNSS is built into more systems there is more opportunity for self-generated interference. At the same time, there are many more signals beyond GPS L1 to utilize, from receiving satellite broadcast correction data below 1559 MHz to receiving E6 signals from Galileo. The pass bands of GNSS receivers must expand to support all the frequencies of navigation interest, which inherently exposes them to more risk of interference. Receiver designs must become more sophisticated to offer the full set of signals while also mitigating interference impacts. Using real data produced from NovAtel receivers, the effect of the various interference types is shown, both in controlled laboratory test setups and in real life examples of typically encountered interference issues. Methods to detect the interference are also demonstrated in those examples. Finally, the efficacy of the mitigation methods is presented. It is shown that the characteristics of a high precision receiver can be maintained while functioning in the presence of interference with mitigation measures running.