This paper presents analysis and results from Global Navigation Satellite System (GNSS) radio frequency inter-ference (RFI) monitoring along one of the main Norwegian highways. Classification and analysis of GNSS RFI data from a period of 20 months is presented, where a simple correlation analysis is performed to understand RFI effects on some GNSS parameters. It is shown that the main type of GNSS RFI severely affecting GNSS receiv-ers are jammers, yet jammers are in no way the most prevalent cause for RFI observed. The data presented shows a continuation of trends described in earlier monitoring campaigns, with a slight increase of jammers in 2021.
The paper also outlines how the results from a monitoring campaign like this could be used effectively in a strategy for spectrum enforcement efforts.