Impact of Robust Interference Mitigation on GNSS Timing

Robust Interference Mitigation (RIM) is a class of techniques that can significantly improve the performance of Global Navigation Satellite System (GNSS) receivers in the presence of jamming and interference. While RIM enables receiver operations in the presence of significant levels of jamming, biases and other distortions could be introduced in the final navigation solution. This paper experimentally analyses the impact of RIM on the timing solution of a GNSS receiver acting as a timing device. In this case, the user coordinates are fixed and the receiver only computes the clock bias and drift. Several tests have been performed and different GNSS modulations have been considered. From the analysis, it emerges that GNSS does not introduce biases. Moreover, the stability of the timing solution, as quantified by the Allan Deviation (ADEV), is not affected by RIM.