Command and Log Reference
48
ID
Field
Type
Descri
ption
Binary
Bytes
Binary
Offset
1
Obsvm
header
Log header
H
0
2
obs
Number
Number of corresponding observation
information
Ulong
4
H
3
System
Freqency
Satellite system
UShort
2
H+4
4
PRN/ slot
Satellite PRN number(starting from 1)
UShort
2
H+6
5
psr
pseudorange measurement, meter
Double
8
H+8
6
adr
Carrier phase(accumulated Doppler
range), cycle
Double
8
H+16
7
psr std
Pseudorange measurement standard
deviation, meter
UShort
2
H+24
8
adr std
Estimated carrier phase standard
deviation, cycle
UShort
2
H+26
9
dopp
Instantaneous
carrier
Doppler
frequency, Hz
Float
4
H+28
10
C/No
Carrier to noise density ratio
C/No = 10[log10(S/N0)]
（
dB-Hz
）
UShort
2
H+32
11
Reserved
Reserved
UShort
2
H+36
12
locktime
Continuous tracking Time of satellite
signal, second
Float
4
H+38
13
ch-tr-
status
Tracking status of satellite signal, see
Table 6-19: Channel Tracking
Status
4
H+42
14…
variable
xxxx
32-bit CRC(for ASCII and Binary only)
Hex
Hex
4
H+4+(#o
bs*42)
variable
[CR][LF]
Sentence terminator(for ASCII only)
Table 6-18: Tracking State
State Description
State
Description
0
Reserved
7
Reserved
1
Reserved
8
Reserved
2
Reserved
9
Reserved
3
Reserved
10
Reserved
4
L1 phase lock loop
11
L2 phase lock loop
5
Reserved
19
Reserved
6
Reserved
Table 6-19: Channel Tracking Status
