H
NovAtel Format Logs
94
GPS/GLONASS Receiver User Manual Rev 1
Example:
$GEPA,991,496487.00,991,495913.00,10787,4,12,83,0,-2.102581933007
-1.216645166007,7.7982763671006,-9.655075073002
-5.014476776002,-3.387468338003,-1.862645149230957E-006
9.3132257461547851E-007,-9.313225746154785E-007,-3.913920372724533E-004
7.2759576141834267E-012,73800,0,13,*49,[CR][LF]
GEPB
Format:
Message ID = 77
Message byte count = 156
Table H.1 GLONASS Ephemeris Flags Coding
Field #
Data
Bytes
Format
Units
Offset
1
Sync
3
char
0
Checksum
1
char
3
Message Id
4
integer
4
Message byte count
4
integer
bytes
8
2
GPS week of log output
4
integer
weeks
12
3
GPS time of log output
8
double
seconds
16
4
Reference week of ephemeris (in GPS time)
4
integer
weeks
24
5
Reference time of ephemeris (in GPS time)
8
double
seconds
28
6
GLONASS time - GPS time
4
integer
seconds
36
7
Slot number
4
integer
ordinal
40
8
Frequency
4
integer
ordinal
44
9
Issue 15 min. reference
4
integer
900s
48
10
Health
4
integer
-
52
11
X position (PZ90)
8
double
meters
56
12
Y position (PZ90)
8
double
meters
64
13
Z position (PZ90)
8
double
meters
72
14
X velocity (PZ90)
8
double
meters/s
80
15
Y velocity (PZ90)
8
double
meters/s
88
16
Z velocity (PZ90)
8
double
meters/s
96
17
X lunisolar acceleration (PZ90)
8
double
meters/s/s
104
18
Y lunisolar acceleration (PZ90)
8
double
meters/s/s
112
19
Z lunisolar acceleration (PZ90)
8
double
meters/s/s
120
20
Tau
8
double
seconds
128
21
Gamma
8
double
seconds/second
136
22
Time of frame start
4
long
seconds
144
23
Age of data
4
integer
days
148
24
Flags (See Table H.1 below)
4
integer
-
152
N 7
N 6
N 5
N 4
N 3
N 2
N 1
N 0
<-
<-
Nibble Number
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7
6 5 4 3
2 1 0
Bit
Description
Range Values
Hex Value
lsb
= 0
P1 FLAG - TIME INTERVAL BETWEEN ADJACENT iISSUE (tb) VALUES
See Table below
00000001
1
00000002
2 P2 FLAG - ODDNESS OR EVENNESS OF iISSUE (tb) VALUE
0 = even, 1 = odd
00000004
3 P3 FLAG - NUMBER OF SATELLITES WITH ALMANAC INFORMATION
WITHIN CURRENT SUBFRAME
0 = four, 1 = five
00000008
4
: RESERVED
31
