Old school Easter eggs.
Rover Latitude
(degree)(or to ECEF)
Rover Longitude
(degree)(or to ECEF)
Rover Altitude
(meter)(or to ECEF)
Talker ID $__GGA NMEA
Base Latitude
(degree)(or to ECEF)
Base Longitude
(degree)(or to ECEF)
Base Altitude
(meter)(or to ECEF)
Base Antenna Height
Quarter Cycle IndicatorRTCM
Reserved for ITRF Realization YearRTCM
Reference Station IDRTCM
Physical Reference Station ID (0,4095)RTCM
Antenna Setup IDRTCM
Antenna Descriptor RTCM
Antenna Serial NumberRTCM
Receiver Type DescriptorRTCM
Receiver Firmware VersionRTCM
Receiver Serial NumberRTCM
GPS Indicator
GLONASS Indicator
GALILEO Indicator
Reference Indicator
Single Receiver Oscillator IndicatorRTCM
Max satellite GPSESPRTK
Max satellite SBASESPRTK
Max OBS in an EpochESPRTK

FieldData Field Notes
GGA - NMEA 0183 When used in the configuration field of ESPrtk, the input format is the geodetic coordinates (Lat-Long-Alt) used for NMEA-GGA messages.
Base Latitude(degree)
Base Longitude(degree)
Base Altitude(meter)
The antenna reference point X-Y-Z-coordinate is referenced to ITRF epoch as given in Reserved for ITRF Realization Year. When used in the configuration field of ESPrtk, the input format is geodetic coordinates (Lat-Long-Alt) and will be converted automatically to Cartesian ECEF (XYZ) coordinates when used in RTCM 1005 , 1006,1032 messages.
Base Antenna Height(meter)The Antenna Height field provides the height of the Antenna Reference Point above the marker used in the survey campaign.
Quarter Cycle Indicator The Quarter Cycle Indicator denotes whether different carrier phase signals tracked on the same frequency have a common phase, i.e. whether or not the fractional PhaseRanges of two signals on the same frequency show a quarter cycle difference (see also section 3.1.7 for further explanation).The definition of the indicator relates exclusively to the correction status of the quarter cycle, and applies to Messages Types 1001, 1002, 1003, 1004, 1009, 1010, 1011, 1012 . Other possible corrections cannot be indicated by this indicator.
  • • 0 - Correction status unspecified
  • • 1 - PhaseRanges in Message Types 1001, 1002, 1003, 1004, 1009, 1010, 1011, 1012 are corrected in such a way that whenever PhaseRanges for different signals on the same frequency are present in these messages, they are guaranteed to be in phase and thus shall show no Quarter-Cycle bias between them (see Table 3.1-5 for details on the adjustments made). Double differences of PhaseRanges tracked with different signals shall show no QuarterCycle differences.
  • • 2 - Phase observations are not corrected. Double differences may show Quarter-Cycle differences for PhaseRanges based on different signals on the same frequency. Processing will require appropriate corrections.
  • • 3 – Reserved
Reserved for ITRF Realization Year The Reference Station ID is determined by the service provider. Its primary purpose is to link all message data to their unique source. It is useful in distinguishing between desired and undesired data in cases where more than one service may be using the same data link frequency. It is also useful in accommodating multiple reference stations within a single data link transmission. In reference network applications the Reference Station ID plays an important role, because it is the link between the observation messages of a specific reference station and its auxiliary information contained in other messages for proper operation. Thus the Service Provider should ensure that the Reference Station ID is unique within the whole network, and that ID’s should be reassigned only when absolutely necessary. Service Providers may need to coordinate their Reference Station ID assignments with other Service Providers in their region in order to avoid conflicts. This may be especially critical for equipment accessing multiple services, depending on their services and means of information distribution.
Physical Reference Station ID (0,4095)
  • • 0 - Use standard IGS Model .
  • • 1-255 - Specific Antenna Setup ID# The Antenna Setup ID is a parameter for use by the service provider to indicate the particular reference station-antenna combination. The number should be increased whenever a change occurs at the station that affects the antenna phase center variations. While the Antenna Descriptor and the Antenna Serial Number give an indication of when the installed antenna has been changed, it is envisioned that other changes could occur. For instance the antenna may have been repaired, or the surrounding of the antenna may have been changed and the provider of the service may want to make the user station aware of the change. Depending on the change of the phase center variations due to a setup change, a change in the Antenna Setup ID would mean that the user should check with the service provider to see if the antenna phase center variation in use is still valid. Of course, the provider must make appropriate information available to the users.
Antenna Descriptor Alphanumeric characters. IGS limits the number of characters to 20 at this time, but this DF allows more characters for future extension.
Antenna Serial NumberAlphanumeric characters. The Antenna Serial Number is the individual antenna serial number as issued by the manufacturer of the antenna. A possible duplication of the Antenna Serial Number is not possible, because together with the Antenna Descriptor only one antenna with the particular number will be available. In order to avoid confusion the Antenna Serial Number should be omitted when the record is used together with reverse reduction to model type calibration values, because it cannot be allocated to a real physical antenna.
Receiver Type Descriptor Any text string for Receiver Type Descriptor can be use. Max length = 31 characters.
Receiver Firmware VersionReceiver Firmware Version
GPS Indicator
  • • 0 - No GPS service supported
  • • 1 - GPS service supported
GLONASS Indicator
  • • 0 -No GLONASS service supported
  • • 1 - GLONASS service supported
GALILEO Indicator
  • • 0 - No Galileo service supported
  • • 1 - Galileo service supported
Reference IndicatorReference-Station Indicator .
  • • 0 - Real, Physical Reference Station
  • • 1 - Non-Physical or Computed Reference Station
Note: A Non-Physical or Computed Reference Station is typically calculated based on information from a network of reference stations. Different approaches have been established over years. The NonPhysical or Computed Reference Stations are sometimes trademarked and may not be compatible. Examples of these names are “Virtual Reference Stations”, “Pseudo-Reference Stations”, and “Individualized Reference Stations”.
Single Receiver Oscillator IndicatorSingle Receiver Oscillator Indicator .
  • • 0 - All raw data observations in messages 1001-1004 and 1009-1012 may be measured at different instants. This indicator should be set to “0” unless all the conditions for “1” are clearly met.
  • • 1 - All raw data observations in messages 1001-1004 and 1009-1012 are measured at the same instant, as described in Section 3.1.4.
Max satellite GPS Max satellite GPS for RTCM-1004 generartor, range [1,32]. ( Reducing the value will save the RAM for ESPrtk.)
Max satellite GLONASSS Max satellite GLONASS for RTCM-1012 generartor, range [1,27]. ( Reducing the value will save the RAM for ESPrtk.)
Max satellite SBAS Max satellite SBAS, range [1,35]. ( Reducing the value will save the RAM for ESPrtk.)
Max OBS in an Epoch Max OBS in an Epoch, range [1,96]. ( Reducing the value will save the RAM for ESPrtk.)