Ephemeris monitor with ambiguity resolution for CAT II/III GBAS

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3 Citations (Scopus)


In safety-critical applications, such as the Ground-Based Augmentation System for precision approaches in civil aviation, it is important to safeguard users under the case of ephemeris failures. For CAT II/III approaches, different ephemeris monitors with approaches for ambiguity resolution are proposed with the double differenced carrier phase as the test statistics. The continuity risks introduced by the ambiguity resolution are addressed by deriving the required averaging time for new, acquired, and re-acquired satellites. Since the ephemeris fault is closely related with the baseline length between ground stations, the minimum baseline length is derived to meet the probability of missed detection region. Current methods are compared with both the averaging time and the ground baseline length. It is demonstrated that a combination of two methods is able to achieve the best performance with 94 averaging epochs and 218 m ground baseline length.

Original languageEnglish
Article number116
JournalGPS Solutions
Issue number4
Publication statusPublished - 1 Oct 2020


  • Ephemeris monitor
  • GBAS
  • GNSS
  • Integrity monitor

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)


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