Novatel MiLLennium OM-20000040 User Manual page 93

H.1.4 GEPA/B EPHEMERIS INFORMATION
GLONASS ephemerides are referenced to the Parametry Zemli 1990 (PZ-90) geodetic datum, and GLONASS
ephemeris information is available through the GEPA/B log. GLONASS coordinates are reconciled internally
through a position filter and output to WGS84. Refer to the SVDA/B log in the MiLLennium Command
Descriptions Manual for information on WGS84.
GEPA
Structure:
$GEPA week seconds
svid freq issue
velX velY velZ
gamma tk age
Field # Field
1 $GEPA Log Header
2 Week GPS Week of log output
3 Seconds GPS Time of log output
4 EphWeek Reference week of ephemeris (in GPS time)
5 EphTime Reference time of ephemeris (in GPS time)
6 Time offset Integer seconds between GPS and GLONASS Time + implies
GLONASS ahead of GPS
7 SVID Slot number for satellite
8 Freq Frequency number for satellite
9 Issue 15-minute interval number corresponding to ephemeris reference
time
10 Health Ephemeris Health (0 = GOOD, 1 = BAD)
11 PosX X coordinate for satellite at reference time (PZ90), in meters
12 PosY Y coordinate for satellite at reference time (PZ90), in meters
13 PosZ Z coordinate for satellite at reference time (PZ90), in meters
14 VelX X coordinate for satellite velocity at reference time (PZ90), in
meters/s
15 VelY Y coordinate for satellite velocity at reference time (PZ90), in
meters/s
16 VelZ Z coordinate for satellite velocity at reference time (PZ90), in
meters/s
17 LSAccX X coordinate for lunisolar acceleration at reference time (PZ90), in
meters/s/s
18 LSAccY Y coordinate for lunisolar acceleration at reference time (PZ90), in
meters/s/s
19 LSAccZ Z coordinate for lunisolar acceleration at reference time (PZ90), in
meters/s/s
20 Tau Clock offset from GLONASS time, in seconds
21 Gamma Frequency Correction, in seconds/second
22 Tk Time of frame start (since start of GLONASS day), in seconds
23 Age Age of data, in days
24 Flags Information flags (see Table H.1, Page 94)
25 *xx Checksum
26 [CR][LF] Sentence Terminator
1
NOTE: Time offset = 3 hours + GPS UTC offset. See Section 1.5 (Page 13) for more information on GLONASS and GPS time.
GPS/GLONASS Receiver User Manual Rev 1
ephweek ephtime
health posX
LSAccX LSAccY
flags *xx
Description
H NovAtel Format Logs
time offset
posY posZ
LSAccZ tau
[CR][LF]
$GEPA
991
496487
991
495913
1
10787
4
12
83
0
-2.102581933593754E+007
-1.216645166015627E+007
7.7982763671875110E+006
-9.655075073242192E+002
-5.014476776123048E+002
-3.387468338012698E+003
-1.862645149230957E-006
9.3132257461547851E-007
-9.313225746154785E-007
-3.913920372724533E-004
7.2759576141834267E-012
73800
0
13
*49
[CR][LF]
Example
93