GNSS Analysis Performance System for GNSS Signal Characterization in Critical Applications

Arnau Pena-Sapena, Victor Gracia-Castillo, Rubén Morales-Ferré, Marc Solé-Gaset, Sergi Locubiche-Serra, David Lázaro-Leiva

Abstract:	Global Navigation Satellite Systems (GNSS) provide positioning and timing services to a myriad of sectors and applications, including transportation, agriculture, telecommunications, energy grids, finance, and emergency response systems. Nevertheless, extremely high accuracy, reliability, integrity, continuity, and robustness in the service are of paramount importance. For such applications, the necessity of a comprehensive GNSS monitoring framework becomes essential to ensure uninterrupted service and integrity, offering early detection system anomalies and supporting a timely response to disruptions. In this context, this paper introducesIndra Deimos’ GNSS Analysis Performance System (GAPS). GAPS is capable of continuously provide accurate information on the status of GNSS constellations and their performances based on the data collected by one or multiple GNSS receivers. GAPS also offers customizable reports generation containing the available GNSS performances data, while performing legal data recording as per International Civil Aviation Organization (ICAO) Standards and Recommended Practices (SARPS). This paper presents the usage of GAPS, developed by Indra Deimos. GAPS includes monitoring performances of novel Galileo services, along with jamming/spoofing detection techniques contributing to the ongoing efforts in securing and improving GNSS resilience. GAPS implements the High Accuracy Service (HAS) in conjunction with Precise Point Positioning (PPP), yielding outstanding real time positioning capabilities compared to standalone and satellite-based augmented solutions in terms of positioning accuracy. In addition, GAPS also provides a clear and intuitive way to assess Galileo’s Open Service Navigation Message Authentication (OSNMA) protocol, demonstrating its effectiveness as an additional layer for spoofing detection. Through an intuitive interface, real-time authentication status is provided, allowing users to quickly verify whether the received signals are legitimate or instead, they have been counterfeited. Moreover, GAPS includes a simple yet effective spoofing and jamming Detector (SJD) mechanism. By leveraging receiver observables, the SJD demonstrates high reliability in identifying jamming, spoofing and multipath events.
Published in:	Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025) September 8 - 12, 2025 Hilton Baltimore Inner Harbor Baltimore, Maryland
Pages:	1534 - 1546
Cite this article:	Pena-Sapena, Arnau, Gracia-Castillo, Victor, Morales-Ferré, Rubén, Solé-Gaset, Marc, Locubiche-Serra, Sergi, Lázaro-Leiva, David, "GNSS Analysis Performance System for GNSS Signal Characterization in Critical Applications," Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025), Baltimore, Maryland, September 2025, pp. 1534-1546. https://doi.org/10.33012/2025.20248
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