Performance of EGNSS-Based Timing in Various Threat Conditions

Salomon Honkala, Sarang Thombre*, Martti Kirkko-Jaakkola, Hein Zelle, Henk Veerman, Anders E. Wallin, Erik F. DIerikx, Sanna Kaasalainen, Stefan Soderholm, Heidi Kuusniemi

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    Today's society is highly reliant on time and frequency synchronization, e.g., in communications systems and financial networks. Precise timing is more and more derived from satellite navigation receivers that are unfortunately very susceptible to various signal threats. We studied the performance of global navigation satellite system (GNSS) timing under different operating conditions and tested the effectiveness of different techniques that improve timing receiver robustness. These features were tested under various threat scenarios related to specific vulnerabilities in GNSS-based timing, such as interference and navigation message errors, and their efficiency was analyzed against the corresponding scenarios. We found that interference or meaconing-type spoofing can threaten GNSS timing, but it can be detected by means of automatic gain control (AGC) and carrier-to-noise ratio-based methods. GNSS interruptions due to interference can be bridged by a local oscillator holdover technique based on a Kalman filter whose parameters are based on a GNSS time solution. Navigation message errors are mitigated by the European Geostationary Navigation Overlay Service (EGNOS), and constellation-wide timing errors can be detected by the use of a dual-constellation [global positioning system (GPS)-Galileo] cross-check. Dual-frequency operation for timing, in addition to mitigating first-order ionospheric effects, was found to be more robust to interference with the option to fall back to single frequency.
    Original languageEnglish
    Pages (from-to)2287-2299
    JournalIEEE Transactions on Instrumentation and Measurement
    Volume69
    Issue number5
    DOIs
    Publication statusPublished - May 2020
    MoE publication typeA1 Journal article-refereed

    Funding

    Manuscript received February 15, 2019; revised April 24, 2019; accepted May 27, 2019. Date of publication August 27, 2019; date of current version April 7, 2020. This research was conducted within the project “Advanced Mission Concepts: R&D for Robust EGNSS Timing Services” funded by the Directorate-General for Internal Market, Industry, Entrepreneurship and SMEs (DGGROW) of the European Commission. The Associate Editor coordinating the review process was Jingyu Hua. (Corresponding authors: Salomon Honkala; Sarang Thombre.) S. Honkala, S. Thombre, M. Kirkko-Jaakkola, and S. Kaasalainen are with the Finnish Geospatial Research Institute, 02430 Kirkkonummi, Finland (e-mail: [email protected]; [email protected]).

    Keywords

    • Global navigation satellite system (GNSS)
    • global positioning system (GPS)
    • robustness
    • time dissemination

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