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Bernese GPS Software Version 5.0 - Bernese GNSS Software

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22.4.1 Constants File<br />

Type: ASCII<br />

Directory: ${X}/GEN (UNIX) or %X%\GEN (Windows)<br />

Extension: -<br />

Content: All physical constants used in the program system.<br />

Created by: Do not change. Available from BSW aftp server.<br />

Used by: Most of the programs.<br />

Example: Figure 22.2 and ${X}/GEN/CONST..<br />

Remarks:<br />

22.4 General Files<br />

• The constants refer to the WGS-84 system of constants. Exception is GM, where the<br />

value from Laser ranging is used and is consistent with the TT timescale.<br />

• The particular values are read from file with subroutine ${LG}/DEFCON.f and introduced<br />

into programs and subroutines using a command like “USE d const, ONLY :<br />

GM”.<br />

• The values for WGTPHA and WGTCOD to specify the relative weights between phase and<br />

code observations (if you use both observation types simultaneously in the parameter<br />

estimation program <strong>GPS</strong>EST).<br />

• Carrier frequencies and frequency differences for GLONASS are included.<br />

• HREF, PREF, TREF, andHUMREF are used for the definition of the standard troposphere<br />

models.<br />

• The major constants contained in this file should not be changed by the user.<br />

GENERAL CONSTANTS FOR BERNESE <strong>GPS</strong> SOFTWARE VERSION <strong>5.0</strong><br />

------------------------------------------------------<br />

C = 299792458.D0 VELOCITY OF LIGHT M/SEC<br />

FREQ1 = 1575420000.D0 L1-CARRIER FREQUENCY <strong>GPS</strong> 1/SEC<br />

FREQ2 = 1227600000.D0 L2-CARRIER FREQUENCY <strong>GPS</strong> 1/SEC<br />

FREQP = 10230000.D0 P-CODE FREQUENCY <strong>GPS</strong> 1/SEC<br />

FREQG1 = 1602000000.D0 L1-CARRIER FREQUENCY GLONASS 1/SEC<br />

FREQG2 = 1246000000.D0 L2-CARRIER FREQUENCY GLONASS 1/SEC<br />

DFRQG1 = 562500.D0 L1-CARRIER FREQ. DIFF. GLONASS 1/SEC<br />

DFRQG2 = 437500.D0 L2-CARRIER FREQ. DIFF. GLONASS 1/SEC<br />

FREQGP = 5110000.D0 P-CODE FREQUENCY GLONASS 1/SEC<br />

GM = 398.6004415D12 GRAVITY CONSTANT*EARTH MASS M**3/SEC**2<br />

GMS = 1.3271250D20 GRAVITY CONSTANT*SOLAR MASS M**3/SEC**2<br />

GMM = 4.9027890D12 GRAVITY CONSTANT*LUNAR MASS M**3/SEC**2<br />

AE = 6378137.D0 EQUATORIAL RADIUS OF EARTH M<br />

CONRE = 6371000.D0 MEAN RADIUS OF THE EARTH M<br />

FACTEC = 40.3D16 IONOSPHERIC FACTOR M/SEC**2/TECU<br />

P0 = -.94D-7 NOMINAL RAD.PR. ACCELERAT. M/SEC**2<br />

OMEGA = 7292115.1467D-11 ANGULAR VELOCITY OF EARTH RAD/SEC<br />

ET-UTC = 55. EPH. TIME (ET) MINUS UTC SEC<br />

WGTPHA = 1.D0 WEIGHT FOR PHASE OBSERVATIONS 1<br />

WGTCOD = 1.D-4 WEIGHT FOR CODE OBSERVATIONS 1<br />

HREF = 0. REFERENCE HEIGHT FOR METEO MODEL M<br />

PREF = 1013.25 PRESSURE AT HREF MBAR<br />

TREF = 18. TEMPERATURE AT HREF DEG. CELSIUS<br />

HUMREF = 50. HUMIDITY AT HREF %<br />

Figure 22.2: File of all physical constants CONST.<br />

<strong>Bernese</strong> <strong>GPS</strong> <strong>Software</strong> <strong>Version</strong> <strong>5.0</strong> Page 479

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