GNSS RFI Localization using a Hybrid TDOA/PDOA Approach

Ryan C. Blay and Dennis M. Akos

Peer Reviewed

Abstract:	Interference in GNSS receivers has been a significant concern for some time with the advent of spoofing and jamming. In order to detect and localize the jammers, the automatic gain control (AGC) can be leveraged to notice an increase in power, and time-difference-of-arrival (TDOA) and power-difference-of-arrival (PDOA) algorithms can estimate the position of the emitters. In this paper, there will be a synthesis of TDOA and PDOA to estimate the most likely location of the emitter using a novel weighted approach. Even though TDOA algorithms are more precise than PDOA algorithms, the hyperbolas that result from TDOA sometimes do not all intersect in the same location. Most often this is due to multipath or blocked line-of sight which delays the signal reaching the receivers. PDOA can supplement the TDOA result by providing a rough estimate that can distinguish one TDOA intersection from another. This results in a higher confidence in the estimated location and determines a baseline point to then iterate on. In a dynamic approach, this would allow an emitter’s location to be tracked through time more accurately than either algorithm alone.
Published in:	Proceedings of the 2018 International Technical Meeting of The Institute of Navigation January 29 - 1, 2018 Hyatt Regency Reston Reston, Virginia
Pages:	703 - 712
Cite this article:	Blay, Ryan C., Akos, Dennis M., "GNSS RFI Localization using a Hybrid TDOA/PDOA Approach," Proceedings of the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2018, pp. 703-712. https://doi.org/10.33012/2018.15554
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