TERSUS GNSS RTK Board Series, User Manual

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Function Satellite range information.
ID Field Description Type Binary
Bytes
Offset
1 Range
Header
Log Header H 0
2 #obs Number of observations with information to
follow
ULON
G
4 H
3 PRN/slot Satellite PRN number of range measurement
GPS: 1 ~ 32
GLONASS: 1~28(slot, it’s diffrent with
$GPGSV)
BDS:161~197
UShort 2 H+4
4 glofreq (GLONASS Fre 7) UShort 2 H+6
5 psr Pseudorange measurement (m) Double 8 H=8
6 psrstd Pseudorange measurement standard deviation (m) Float 4 H+16
7 adr Carrier phase, in cycles (accumulated Doppler
range)
Double 8 H+20
8 adrstd Estimated carrier phase standard deviation
(cycles)
Float 4 H+28
9 dopp Instantaneous carrier Doppler frequency (Hz) Float 4 H+32
10 C/No Carrier to noise density ratio C/No =
10[log10(S/N0)] (dB-Hz)
Float 4 H+36
11 locktime Seconds of continuous tracking(no cycle slipping) Float 4 H+40
12 ch-tr-stat
us
Tracking status(see Table 55 Tracking status) Float 4 H+44
13.
..
Next PRN offset = H + 4 + (#obs x 44)
xxxx 32-bit crc(ASCII and Binary only) Hex 4 H+4+
(#obs
x
44)
[CR][LF
]
Sentence terminator (ASCII only) - - -
Table 55 Tracking status
Nibble Bit Mask Description Value
N0 0 0x00000001 Tracking state See Table 56 Tracking State
1 0x00000002
2 0x00000004
3 0x00000008
N1 4 0x00000010 SV channel number (n-1) (0 = first, n = last) n depends on the