GLONASS Navigation Data (RINEX v4)

R2026b

For RINEX version 4 files, GLONASS navigation data is organized by navigation message type. Each navigation message type may provide ephemeris data, system time offset parameters, Earth orientation parameters, and ionospheric model data, depending on the message. FDMA provides ephemeris and system time offset data, while the CDMA types (L1OC, L3OC) additionally provide Earth orientation and ionospheric model data.

GLONASS navigation messages are returned within the output structure data.GLONASS and are grouped by navigation message type. GLONASS time is referenced to UTC(SU), unlike GPS, Galileo, and BeiDou which use their own continuous time systems.

These GLONASS navigation message types are supported:

  • data.GLONASS.FDMA — Frequency Division Multiple Access (FDMA) navigation messages transmitted on legacy GLONASS signals.

  • data.GLONASS.L1OC — Code Division Multiple Access (CDMA) navigation messages transmitted on the L1 signal.

  • data.GLONASS.L3OC — Code Division Multiple Access (CDMA) navigation messages transmitted on the L3 signal.

Each navigation message type may include one or more of these message categories:

  • Ephemeris navigation messages (EPH), which provide satellite orbit and clock parameters.

  • System time offset messages (STO), which provide parameters for transforming between time systems.

  • Earth orientation parameters messages (EOP), which provide corrections related to Earth rotation.

  • Ionospheric model messages (ION), which provide parameters for ionospheric delay correction.

Not all message types provide all categories. Only the categories listed below with links are available for each message type.

Detailed descriptions of each GLONASS navigation message and its corresponding output format are provided on the message‑specific reference pages:

See Also

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