?? rinex210.txt
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With the implementation of GNSS programs, GPS-like ranging measurements can be
performed on geostationary navigation payloads.
RINEX Version 2.10 defines the necessary extensions to handle such data in
RINEX files for data exchange and postprocessing purposes.
9.1 RINEX Observation Files for GEO Satellites
A new satellite system identifier has been defined for the geostationary
GPS signal payloads: "S", to be used in the RINEX VERSION / TYPE header line
and in the satellite identifier 'snn', nn being the GEO PRN number minus 100.
e.g.: PRN = 120 --> 'snn' = "S20"
In mixed dual frequency GPS satellite / single frequency GEO payload
observation files the fields for the second frequency observations of GEO
satellites remain blank, are set to zero values or (if last in the record) |
can be truncated. |
The time system identifier of GEO satellites generating GPS signals defaults |
to GPS time. |
9.2 RINEX Navigation Message Files for GEO Satellites
As the GEO broadcast orbit format differs from the GPS message a special GEO
navigation message file format has been defined which is nearly identical with
the GLONASS nav mess file format.
The header section contains informations about the generating program,
comments, and the difference between the GEO system time and UTC.
The first data record contains the epoch and satellite clock information,
the following records contain the satellite position, velocity and
acceleration and auxiliary information such as health, age of the data, etc.
The time tags in the GEO navigation files are given in the GPS time frame,
i.e. not UTC.
The corrections of the satellite time to UTC are as follows:
GEO : Tutc = Tsv - aGf0 - aGf1 *(Tsv-Toe) - W0 - leap_sec
W0 being the correction to transform the GEO system time to UTC. Toe, aGf0,
aGf1 see below in the format definition tables.
* References for the definition of the accuracy and health codes still have *
* to be defined. *
* Help is needed here by colleagues working with such GEO data! *
10. REFERENCES
Evans, A. (1989): "Summary of the Workshop on GPS Exchange Formats."
Proceedings of the Fifth International Geodetic Symposium on Satellite
Systems, pp. 917ff, Las Cruces.
Gurtner, W., G. Mader, D. Arthur (1989): "A Common Exchange Format for
GPS Data." CSTG GPS Bulletin Vol.2 No.3, May/June 1989, National Geodetic
Survey, Rockville.
Gurtner, W., G. Mader (1990): "The RINEX Format: Current Status, Future
Developments." Proceedings of the Second International Symposium of Precise
Positioning with the Global Positioning system, pp. 977ff, Ottawa.
Gurtner, W., G. Mader (1990): "Receiver Independent Exchange Format
Version 2." CSTG GPS Bulletin Vol.3 No.3, Sept/Oct 1990, National Geodetic
Survey, Rockville.
Gurtner, W. (1994): "RINEX: The Receiver-Independent Exchange Format."
GPS World, Volume 5, Number 7, July 1994.
11. RINEX VERSION 2.10 FORMAT DEFINITIONS AND EXAMPLES
+----------------------------------------------------------------------------+
| TABLE A1 |
| GPS OBSERVATION DATA FILE - HEADER SECTION DESCRIPTION |
+--------------------+------------------------------------------+------------+
| HEADER LABEL | DESCRIPTION | FORMAT |
| (Columns 61-80) | | |
+--------------------+------------------------------------------+------------+
|RINEX VERSION / TYPE| - Format version (2.10) | F9.2,11X, |
| | - File type ('O' for Observation Data) | A1,19X, |
| | - Satellite System: blank or 'G': GPS | A1,19X |
| | 'R': GLONASS | |
| | 'S': Geostationary | |
| | signal payload | |
| | 'T': NNSS Transit | |
| | 'M': Mixed | |
+--------------------+------------------------------------------+------------+
|PGM / RUN BY / DATE | - Name of program creating current file | A20, |
| | - Name of agency creating current file | A20, |
| | - Date of file creation | A20 |
+--------------------+------------------------------------------+------------+
*|COMMENT | Comment line(s) | A60 |*
+--------------------+------------------------------------------+------------+
|MARKER NAME | Name of antenna marker | A60 |
+--------------------+------------------------------------------+------------+
*|MARKER NUMBER | Number of antenna marker | A20 |*
+--------------------+------------------------------------------+------------+
|OBSERVER / AGENCY | Name of observer / agency | A20,A40 |
+--------------------+------------------------------------------+------------+
|REC # / TYPE / VERS | Receiver number, type, and version | 3A20 |
| | (Version: e.g. Internal Software Version)| |
+--------------------+------------------------------------------+------------+
|ANT # / TYPE | Antenna number and type | 2A20 |
+--------------------+------------------------------------------+------------+
|APPROX POSITION XYZ | Approximate marker position (WGS84) | 3F14.4 |
+--------------------+------------------------------------------+------------+
|ANTENNA: DELTA H/E/N| - Antenna height: Height of bottom | 3F14.4 |
| | surface of antenna above marker | |
| | - Eccentricities of antenna center | |
| | relative to marker to the east | |
| | and north (all units in meters) | |
+--------------------+------------------------------------------+------------+
|WAVELENGTH FACT L1/2| - Default wavelength factors for | |
| | L1 and L2 | 2I6, |
| | 1: Full cycle ambiguities | |
| | 2: Half cycle ambiguities (squaring) | |
| | 0 (in L2): Single frequency instrument | |
| | | |
| | - zero or blank | I6 |
| | | |
| | The default wavelength factor line is | |
| | required and must preceed satellite- | |
| | specific lines. | |
+--------------------+------------------------------------------+------------+
*|WAVELENGTH FACT L1/2| - Wavelength factors for L1 and L2 | 2I6, |*
| | 1: Full cycle ambiguities | |
| | 2: Half cycle ambiguities (squaring) | |
| | 0 (in L2): Single frequency instrument | |
| | - Number of satellites to follow in list | I6, |
| | for which these factors are valid. | |
| | - List of PRNs (satellite numbers with | 7(3X,A1,I2)|
| | system identifier) | |
| | | |
| | These opional satellite specific lines | |
| | may follow, if they identify a state | |
| | different from the default values. | |
| | | |
| | Repeat record if necessary. | |
+--------------------+------------------------------------------+------------+
|# / TYPES OF OBSERV | - Number of different observation types | I6, |
| | stored in the file | |
| | - Observation types | 9(4X,A2) |
| | | |
| | If more than 9 observation types: | |
| | Use continuation line(s) |6X,9(4X,A2) |
| | | |
| | The following observation types are | |
| | defined in RINEX Version 2.10: | |
| | | |
| | L1, L2: Phase measurements on L1 and L2 | |
| | C1 : Pseudorange using C/A-Code on L1 | |
| | P1, P2: Pseudorange using P-Code on L1,L2| |
| | D1, D2: Doppler frequency on L1 and L2 | |
| | T1, T2: Transit Integrated Doppler on | |
| | 150 (T1) and 400 MHz (T2) | |
| | S1, S2: Raw signal strengths or SNR | |
| | values as given by the receiver | |
| | for the L1,L2 phase observations | |
| | | |
| | Observations collected under Antispoofing| |
| | are converted to "L2" or "P2" and flagged| |
| | with bit 2 of loss of lock indicator | |
| | (see Table A2). | |
| | | |
| | Units : Phase : full cycles | |
| | Pseudorange : meters | |
| | Doppler : Hz | |
| | Transit : cycles | |
| | SNR etc : receiver-dependent | |
| | | |
| | The sequence of the types in this record | |
| | has to correspond to the sequence of the | |
| | observations in the observation records | |
+--------------------+------------------------------------------+------------+
*|INTERVAL | Observation interval in seconds | F10.3 |*
+--------------------+------------------------------------------+------------+
|TIME OF FIRST OBS | - Time of first observation record | 5I6,F13.7, |
| | (4-digit-year, month,day,hour,min,sec) | |
| | - Time system: GPS (=GPS time system) | 5X,A3 |
| | GLO (=UTC time system) | |
| | Compulsory in mixed GPS/GLONASS files | |
| | Defaults: GPS for pure GPS files | |
| | GLO for pure GLONASS files | |
+--------------------+------------------------------------------+------------+
*|TIME OF LAST OBS | - Time of last observation record | 5I6,F13.7, |*
| | (4-digit-year, month,day,hour,min,sec) | |
| | - Time system: Same value as in | 5X,A3 ||
| | TIME OF FIRST OBS record | ||
+--------------------+------------------------------------------+------------+
*|RCV CLOCK OFFS APPL | Epoch, code, and phase are corrected by | I6 |*
| | applying the realtime-derived receiver | |
| | clock offset: 1=yes, 0=no; default: 0=no | |
| | Record required if clock offsets are | |
| | reported in the EPOCH/SAT records | |
+--------------------+------------------------------------------+------------+
*|LEAP SECONDS | Number of leap seconds since 6-Jan-1980 | I6 |*
| | Recommended for mixed GPS/GLONASS files | |
+--------------------+------------------------------------------+------------+
*|# OF SATELLITES | Number of satellites, for which | I6 |*
| | observations are stored in the file | |
+--------------------+------------------------------------------+------------+
*|PRN / # OF OBS | PRN (sat.number), number of observations |3X,A1,I2,9I6|*
| | for each observation type indicated | |
| | in the "# / TYPES OF OBSERV" - record. | |
| | | |
| | If more than 9 observation types: | |
| | Use continuation line(s) | 6X,9I6 |
| | | |
| | This record is (these records are) | |
| | repeated for each satellite present in | |
| | the data file | |
+--------------------+------------------------------------------+------------+
|END OF HEADER | Last record in the header section. | 60X |
+--------------------+------------------------------------------+------------+
Records marked with * are optional
+----------------------------------------------------------------------------+
| TABLE A2 |
| GPS OBSERVATION DATA FILE - DATA RECORD DESCRIPTION |
+-------------+-------------------------------------------------+------------+
| OBS. RECORD | DESCRIPTION | FORMAT |
+-------------+-------------------------------------------------+------------+
| EPOCH/SAT | - Epoch : | |
| or | - year (2 digits, padded with 0 if necessary) | 1X,I2.2, |
| EVENT FLAG | - month,day,hour,min, | 4(1X,I2), |
| | - sec | F11.7, |
| | | |
| | - Epoch flag 0: OK | 2X,I1, |
| | 1: power failure between | |
| | previous and current epoch | |
| | >1: Event flag | |
| | - Number of satellites in current epoch | I3, |
| | - List of PRNs (sat.numbers with system | 12(A1,I2), |
| | identifier, see 5.1) in current epoch | |
| | - receiver clock offset (seconds, optional) | F12.9 |
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