15 September 2010
ANTEX: The Antenna Exchange Format, Version 1.4
***********************************************
M. Rothacher, R. Schmid
Forschungseinrichtung Satellitengeodäsie
TU München
1. VERSION 1.4 MODIFICATIONS
The modifications leading to Version 1.4 include:
- integration of Compass, QZSS and SBAS (1.4)
- definition of the Galileo satellite numbers (1.4)
- IGS sorting convention (1.4)
- definition of the frequency number codes (1.3)
- clarification of the satellite-fixed coordinate system (1.3)
- IGS naming convention (1.3)
- definition of the antenna corrections (1.3)
- optional SVN number and COSPAR ID (1.3)
- optional serial number for reference antenna (1.2)
- new calibration method ROBOT (1.2)
- antenna-specific SINEX CODE (1.1)
2. FILE EXTENSION
It is recommended to use 'atx' as file extension.
For official IGS models the following naming convention is used:
mmmmm_wwww.atx
| |
| +------- wwww: GPS week of the last file change
|
+------------ mmmmm: 5-character model name (will only be changed, if
existing values are changed)
For official IGS models the following sorting convention is applied:
SATELLITE ANTENNAS:
--> sorted by satellite system (GPS -> GLONASS -> Galileo -> Compass -> QZSS
-> SBAS)
--> sorted by satellite code "sNN"
--> sorted by 'VALID FROM'
RECEIVER ANTENNAS:
--> sorted by antenna code
--> sorted by radome code (NONE -> other radome types)
--> sorted by 'SERIAL NO'
3. DEFINITION OF THE ANTENNA CORRECTIONS
In order to clarify the sign convention, the following shortened formulae are
given:
RECEIVER ANTENNA:
mean phase
center position = ARP (antenna reference point) position +
phase center offset vector (given in a topocentric
left-handed system: north, east and up component)
observed distance = geometric distance to the mean phase center +
phase center variations (zenith, azimuth) +
other corrections
(Here the azimuth counts clockwise from the North toward the East.)
SATELLITE ANTENNA:
mean phase
center position = CM (center of mass) position +
phase center offset vector
(The phase center offset is given in a satellite-fixed
right-handed coordinate system:
- z-axis points toward the geocenter
- y-axis (rotation axis of the solar panels) corresponds
to the cross product of the z-axis with the vector from
the satellite to the Sun
- x-axis completes the right-handed system
(x cross y = z))
observed distance = geometric distance to the mean phase center +
phase center variations (nadir, azimuth) +
other corrections
(Here the azimuth counts clockwise from the y-axis toward the x-axis when
looking in the direction of the negative z-axis or toward deep space,
respectively. For the estimation of the azimuth angle under which a station is
seen from the satellite, the yaw attitude (rotation about the z-axis) has to be
considered. Furthermore, deviations from the nominal attitude occur during
eclipse seasons when the Sun sensors fail.)
4. ANTEX VERSION 1.4 FORMAT DEFINITIONS
+--------------------+------------------------------------------+------------+
| HEADER LABEL | DESCRIPTION | FORMAT |
| (Columns 61-80) | | |
+--------------------+------------------------------------------+------------+
|ANTEX VERSION / SYST| - Format version (1.4) | F8.1,12X, |
| | - Satellite system: 'G': GPS | A1,39X |
| | 'R': GLONASS | |
| | 'E': Galileo | |
| | 'C': Compass | |
| | 'J': QZSS | |
| | 'S': SBAS | |
| | 'M': Mixed | |
+--------------------+------------------------------------------+------------+
|PCV TYPE / REFANT | - Phase center variation type: | A1,19X, |
| | 'A': absolute values | |
| | 'R': relative values | |
| | - Reference antenna type for relative | A20, |
| | values (blank: AOAD/M_T) | |
| | - Serial number of the reference antenna | A20 |
| | (optional) | |
+--------------------+------------------------------------------+------------+
*|COMMENT | Comment line(s) | A60 |*
| | (only allowed at the specified position) | |
+--------------------+------------------------------------------+------------+
|END OF HEADER | Last record in the header section. | 60X |
+--------------------+------------------------------------------+------------+
|START OF ANTENNA | Record indicating the start of an antenna| 60X |
| | section. | |
+--------------------+------------------------------------------+------------+
|TYPE / SERIAL NO | Receiver antenna: | |
| | - Antenna type: strict IGS | A20, |
| | rcvr_ant.tab antenna and radome code | |
| | - Serial number (blank: all representa- | A20, |
| | tives of the specified antenna type) | |
| | - blank | A10, |
| | - blank | A10 |
| | Satellite antenna: | |
| | - Antenna type: strict IGS | |
| | rcvr_ant.tab satellite antenna code | |
| | Example: 'BLOCK IIA' | |
| | - Satellite code "sNN" (blank: all | |
| | representatives of the specified | |
| | antenna type) | |
| | For the selection of single satellites| |
| | the satellite system flag ('G','R', | |
| | 'E','C','J','S') together with the PRN| |
| | number (GPS, Compass), the slot number| |
| | (GLONASS), the SVID number (Galileo), | |
| | the 'PRN number minus 192' (QZSS) or | |
| | the 'PRN number minus 100' (SBAS) has | |
| | to be specified. | |
| | Example: 'G05' | |
| | - Satellite code "sNNN" (optional) | |
| | s - satellite system flag | |
| | NNN - SVN number (GPS), GLONASS | |
| | number, GSAT number (Galileo) | |
| | or SVN number (QZSS); blank | |
| | (Compass, SBAS) | |
| | - COSPAR ID "YYYY-XXXA" (optional) | |
| | YYYY - year of when the launch vehicle| |
| | was put in orbit | |
| | XXX - sequential launch vehicle | |
| | number for that year | |
| | A - alpha numeric sequence number | |
| | within a launch | |
+--------------------+------------------------------------------+------------+
|METH / BY / # / DATE| - Calibration method: | A20, |
| | 'CHAMBER', 'FIELD', 'ROBOT', | |
| | 'COPIED' from other antenna, | |
| | 'CONVERTED' from igs_01.pcv or blank | |
| | - Name of agency | A20, |
| | - Number of individual antennas | I6,4X, |
| | calibrated | |
| | - Date | A10 |
+--------------------+------------------------------------------+------------+
|DAZI | Increment of the azimuth: | 2X,F6.1, |
| | 0 to 360 with increment 'DAZI' | 52X |
| | (in degrees). | |
| | 360 degrees have to be divisible by | |
| | 'DAZI'. | |
| | Common value for 'DAZI': 5.0 | |
| | For non-azimuth-dependent phase center | |
| | variations '0.0' has to be specified. | |
+--------------------+------------------------------------------+------------+
|ZEN1 / ZEN2 / DZEN | Receiver antenna: | 2X,3F6.1, |
| | Definition of the grid in zenith | 40X |
| | angle: | |
| | Zenith distance 'ZEN1' to 'ZEN2' with | |
| | increment 'DZEN' (in degrees). 'DZEN' | |
| | has to be > 0.0. | |
| | 'ZEN1' and 'ZEN2' always have to be | |
| | multiples of 'DZEN'. | |
| | 'ZEN2' always has to be greater than | |
| | 'ZEN1'. | |
| | Common value for 'DZEN': 5.0 | |
| | Example: ' 0.0 90.0 5.0' | |
| | Satellite antenna: | |
| | Definition of the grid in nadir | |
| | angle: | |
| | Nadir angle 'ZEN1' to 'ZEN2' with | |
| | increment 'DZEN' (in degrees). 'DZEN' | |
| | has to be > 0.0. | |
| | 'ZEN1' and 'ZEN2' always have to be | |
| | multiples of 'DZEN'. | |
| | 'ZEN2' always has to be greater than | |
| | 'ZEN1'. | |
| | Common value for 'DZEN': 1.0 | |
| | Example: ' 0.0 14.0 1.0' | |
+--------------------+------------------------------------------+------------+
|# OF FREQUENCIES | Number of frequencies, for which phase | I6,54X |
| | patterns are stored for the current | |
| | antenna. | |
+--------------------+------------------------------------------+------------+
*|VALID FROM | Start of validity period in GPS time | 5I6,F13.7, |*
| | (4-digit year, month, day, hour, min, | 17X |
| | sec) | |
+--------------------+------------------------------------------+------------+
*|VALID UNTIL | End of validity period in GPS time | 5I6,F13.7, |*
| | (4-digit year, month, day, hour, min, | 17X |
| | sec) | |
+--------------------+------------------------------------------+------------+
*|SINEX CODE | Name of the antenna calibration model to | A10,50X |*
| | be used in the SINEX format (for | |
| | referencing purposes) | |
+--------------------+------------------------------------------+------------+
*|COMMENT | Comment line(s) | A60 |*
| | (only allowed at the specified position) | |
+--------------------+------------------------------------------+------------+
|START OF FREQUENCY | Record indicating the start of a new |3X,A1,I2,54X|
| | frequency section. The satellite system | |
| | flag ('G','R','E','C','J','S') has to be | |
| | specified together with the frequency | |
| | number code that has to be consistent | |
| | with the RINEX definition: | |
| | GPS: 'G01' - L1 | |
| | 'G02' - L2 | |
| | 'G05' - L5 | |
| | GLONASS: 'R01' - G1 | |
| | 'R02' - G2 | |
| | Galileo: 'E01' - E1 | |
| | 'E05' - E5a | |
| | 'E07' - E5b | |
| | 'E08' - E5 (E5a+E5b) | |
| | 'E06' - E6 | |
| | Compass: 'C01' - E1 | |
| | 'C02' - E2 | |
| | 'C07' - E5b | |
| | 'C06' - E6 | |
| | QZSS: 'J01' - L1 | |
| | 'J02' - L2 | |
| | 'J05' - L5 | |
| | 'J06' - LEX | |
| | SBAS: 'S01' - L1 | |
| | 'S05' - L5 | |
| | The frequency section includes the | |
| | eccentricities of the mean antenna phase | |
| | center and the phase pattern values. | |
| | Neither other types of records nor | |
| | comment lines are allowed within this | |
| | section. | |
+--------------------+------------------------------------------+------------+
|NORTH / EAST / UP | Receiver antenna: | 3F10.2,30X |
| | Eccentricities of the mean antenna phase| |
| | center relative to the antenna reference| |
| | point (ARP). North, east and up | |
| | component (in millimeters). | |
| | Satellite antenna: | |
| | Eccentricities of the mean antenna phase| |
| | center relative to the center of mass of| |
| | the satellite in X-, Y- and Z-direction | |
| | (in millimeters). | |
+--------------------+------------------------------------------+------------+
|(Values of a non- | The flag 'NOAZI' denotes a non-azimuth- | 3X,A5,mF8.2|
|azimuth-dependent | dependent pattern that has to be | |
|pattern) | specified in any case (also if 'DAZI' > | |
| | 0.0). | |
| | Phase pattern values in millimeters from | |
| | 'ZEN1' to 'ZEN2' (with increment 'DZEN').| |
| | All values on one line. | |
+--------------------+------------------------------------------+------------+
*|(Values of an | The azimuth-dependent pattern has to be | F8.1,mF8.2 |*
|azimuth-dependent | specified, if 'DAZI' > 0.0. The first | |
|pattern) | value in each line denotes the azimuth | |
| | angle followed by the phase pattern | |
| | values in millimeters from 'ZEN1' to | |
| | 'ZEN2' (with increment 'DZEN'). | |
| | All values of one azimuth angle on one | |
| | line. | |
+--------------------+------------------------------------------+------------+
|END OF FREQUENCY | Record indicating the end of a frequency |3X,A1,I2,54X|
| | section (see also 'START OF FREQUENCY'). | |
+--------------------+------------------------------------------+------------+
*|START OF FREQ RMS | Record indicating the start of an rms |3X,A1,I2,54X|*
| | value section related to the specified | |
| | frequency. | |
| | The section includes the rms values of | |
| | the phase center eccentricities and of | |
| | the phase pattern values. | |
| | Neither other types of records nor | |
| | comment lines are allowed within this | |
| | section. | |
+--------------------+------------------------------------------+------------+
*|NORTH / EAST / UP | Rms of the eccentricities (in milli- | 3F10.2,30X |*
| | meters). | |
+--------------------+------------------------------------------+------------+
*|(Rms values of the | The flag 'NOAZI' denotes the rms values | 3X,A5,mF8.2|*
|non-azimuth- | of the non-azimuth-dependent pattern. | |
|dependent pattern) | Phase pattern rms values in millimeters | |
| | from 'ZEN1' to 'ZEN2' (with increment | |
| | 'DZEN'). | |
| | All values on one line. | |
+--------------------+------------------------------------------+------------+
*|(Rms values of the | Rms values of the azimuth-dependent | F8.1,mF8.2 |*
|azimuth-dependent | pattern, if 'DAZI' > 0.0. The first | |
|pattern) | value in each line denotes the azimuth | |
| | angle followed by the phase pattern rms | |
| | values in millimeters from 'ZEN1' to | |
| | 'ZEN2' (with increment 'DZEN'). | |
| | All values of one azimuth angle on one | |
| | line. | |
+--------------------+------------------------------------------+------------+
*|END OF FREQ RMS | Record indicating the end of an rms value|3X,A1,I2,54X|*
| | section (see also 'START OF FREQ RMS'). | |
+--------------------+------------------------------------------+------------+
|END OF ANTENNA | Record indicating the end of an antenna | 60X |
| | section. | |
+--------------------+------------------------------------------+------------+
Records marked with * are optional
5. COMMENTS
- For information on GPS satellites (SVN, PRN, etc.) please refer to
ftp://tycho.usno.navy.mil/pub/gps/gpsb1.txt and
ftp://tycho.usno.navy.mil/pub/gps/gpsb2.txt or
http://gge.unb.ca/Resources/GPSConstellationStatus.txt
- For information on GLONASS satellites (GLONASS number, slot number, etc.)
please refer to
http://www.glonass-ianc.rsa.ru/ or
http://gge.unb.ca/Resources/GLONASSConstellationStatus.txt or
http://web.archive.org/web/20060304211606/http://www.glonass-center.ru/hist_e.html
- For information on Compass satellites please refer to
http://www.beidou.gov.cn/
- For information on QZSS satellites (PRN, etc.) please refer to
http://qzss.jaxa.jp/is-qzss/IS-QZSS_11_E.pdf or
http://www.losangeles.af.mil/library/factsheets/factsheet.asp?id=8618
- For information on SBAS satellites (PRN, etc.) please refer to
http://www.losangeles.af.mil/library/factsheets/factsheet.asp?id=8618
- For COSPAR IDs please refer to
http://nssdc.gsfc.nasa.gov/nmc/SpacecraftQuery.jsp or
http://ilrs.gsfc.nasa.gov/satellite_missions/list_of_satellites/gl40_general.html
- For IGS standard antenna names please refer to
ftp://igs.org/igscb/station/general/rcvr_ant.tab
- For further antenna calibration results please refer to
http://www.ngs.noaa.gov/ANTCAL/ or
http://gnpcvdb.geopp.de/
6. REFERENCES
Rothacher, M., Mader, G. (2003): "Receiver and satellite antenna phase center
offsets and variations." In: Tétreault, P., Neilan, R., Gowey, K. (eds.)
Proceedings of the Network, Data and Analysis Centre 2002 Workshop, pp.
141-152, Ottawa.
(http://igs.org/igscb/resource/pubs/02_ott/session_8.pdf)
Schmid, R., Mader, G., Herring, T. (2005): "From relative to absolute antenna
phase center corrections." In: Meindl, M. (ed.) Proceedings of the IGS Workshop
and Symposium 2004, Bern.
(http://igs.org/igscb/resource/pubs/04_rtberne/Session10_1.pdf)
尚无评论！