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Appendices
Test Bed Receiver Subsystem Addendum – Rev 1 39
GALA/B ALMANAC INFORMATION
The GLONASS almanac reference time and week are in GPS time coordinates. GLONASS ephemeris information is
available through the GEPA/B log.
GALA
Structure:
$GALA week
seconds week time SVID freq health TlambdaN
LambadN
deltal ecc argperig deltaT deltaTD tau *xx [CR][LF]
Field #
Field
Description Example
1 $GALA Log Header $GALA
2 Week GPS Week, in weeks 991
3 Seconds GPS Time, in seconds 496470.59
4 Week GPS Week for almanac reference time (GLONASS time in GPS
format), in weeks
991
5 Time GPS Time for almanac reference time (GLONASS time in GPS
format), in seconds
374232.88
6 SVID Slot number for satellite, ordinal 16
7 Freq Frequency for satellite, ordinal 22
8 Health Ephemeris Health (1 = GOOD, 0 = BAD) 1
9 TlambdaN GLONASS Time of ascending node equator crossing, in seconds 3.94199E+004
10 LambdaN Longitude of ascending node equator crossing (PZ90), in radians -9.2257260E-001
11 Deltal Correction to nominal inclination, in radians 3.02841363E-002
12 Ecc Eccentricity 1.49440765E-003
13 ArgPerig Argument of perigee (PZ90), in radians 1.04694189E-001
14 DeltaT Offset to nominal orbital period, in seconds -2.6561113E+003
15 DeltaTD Rate of orbital period, in seconds per orbital period 3.66210937E-004
16 Tau Clock offset, in seconds -2.0217896E-004*38
Example:
$GALA,991,496470.59,991,374232.88,16,22,1,3.94199E+004,-9.2257260E-001
3.02841363E-002,1.49440765E-003,1.04694189E-001,-2.6561113E+003,
3.66210937E-004,-2.0217896E-004*38