Interference mitigation: impact on GNSS timing

Abstract While interference mitigation techniques can significantly improve the performance of a Global Navigation Satellite System (GNSS) receiver in presence jamming, they also introduce distortions, biases and delays on GNSS measurements final solution. We analyze impact five solution provided by timing that operates known location under static conditions. In this configuration, only estimates its clock bias drift, which be potentially affected mitigation. The analysis has been performed considering multiconstellation case, including GPS L1 Coarse Acquisition (C/A), Galileo E1b/c Beidou B1c signals. Tests were conducted wideband E5b modulation. all cases, real jammers used to challenge signal reception. analyzed are four Robust Interference Mitigation (RIM) approaches Adaptive Notch Filter (ANF). From analysis, it emerges RIM do not affect drift. On other hand, ANF introduces modulation-dependent delay bias. This is difficult predict common signals adopting modulations with similar spectral characteristics. respect, interoperable such as components same way ANF, leaves Galileo–Beidou intersystem unaltered. Stability performed: does increase short-term characteristics estimated drift for low jamming levels.