SBAS System Time Offset Message (RINEX v4)

R2026b

System time offset messages provide parameters for transforming between GNSS system time scales.

This system time offset message is returned by the rinexread function as a timetable stored in the field data.SBAS.SBAS.STO. Each row of the timetable corresponds to a transmitted system time offset message.

For a high-level overview of the available SBAS navigation message types and their organization in RINEX version 4, see SBAS Navigation Data (RINEX v4).

FieldData TypeDescription

Time

 datetime

SBAS clock time

SatelliteID

 double

Satellite system (S) number

TimeOffsetCodes

 string

Four‑character code identifying the pair of time scales for which the system time offset is defined. The value is formatted as two 2‑character system time codes concatenated as source to target. The system time codes are:

  • "GP" — GPS

  • "GL" — GLONASS

  • "GA" — Galileo

  • "BD" — BeiDou

  • "QZ" — QZSS

  • "IR" — NavIC

  • "SB" — SBAS

  • "UT" — UTC

For example, "GPUT" indicates an offset from GPS time ("GP") to UTC ("UT").

SBASIDstring

Identifier of the SBAS system associated with the time offset as one of these values:

  • "WAAS" — Wide Area Augmentation System (United States)

  • "EGNOS" — European Geostationary Navigation Overlay Service

  • "MSAS" — Multi‑functional Satellite Augmentation System (Japan)

  • "GAGAN" — GPS Aided GEO Augmented Navigation (India)

  • "SDCM" — System for Differential Corrections and Monitoring (Russia)

  • "BDSBAS" — BeiDou Satellite‑Based Augmentation System

  • "KASS" — Korean Augmentation Satellite System

  • "A-SBAS" — African Satellite‑Based Augmentation System

  • "SPAN" — South Pacific Augmentation Network

UTCID

 string

Identifier of the UTC realization associated with the time offset. Possible values include:

  • "UTC(USNO)" — United States Naval Observatory (GPS)

  • "UTC(SU)" — Russian UTC realization (GLONASS)

  • "UTCGAL" — Galileo UTC realization

  • "UTC(NTSC)" — National Time Service Center (BeiDou)

  • "UTC(NICT)" — National Institute of Information and Communications Technology (QZSS)

  • "UTC(NPLI)" — National Physical Laboratory India (NavIC)

  • "UTCIRN" — NavIC/IRNSS UTC realization

  • "UTC(OP)" — Observatoire de Paris

  • "UTC(NIST)" — National Institute of Standards and Technology (United States)

TransmissionTime

double

Transmission time of the message (seconds of the GPS week)

A0

 double

Constant term of the polynomial describing the system time offset (s).

A1

 double

Linear term of the polynomial describing the system time offset (s/s)

A2

 double

Quadratic term of the polynomial describing the system time offset (s/s²)

See Also

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