42
/
49
11 9.500
12 19.000
13 38.000
14 76.000
15 152.000
3.
GPS: 1 to 32, GLONASS: 1 to 28,and BDS: 161-197.
4.
The Lock Time field of the RANGECMP log is constrained to a maximum value of 2,097,151
which represents a lock time of 65535.96875 s (2097151 ¸
32).
5.
C/No is constrained to a value between 20-51 dB-Hz. Thus, if it is reported that C/No = 20
dB-Hz, the actual value could be less. Likewise, if it is reported that C/No = 51, the true value
could be greater.
3.1.23
RTCM messages
RTCM 2.X and RTCM 3.X standard are supported, which is used to deliver the base
station information to user side. RTCM defined a set of message types to deliver
different information.
3.1.23.1
RTCM2 messages
Below is a list of RTCM version 2.x message types supported by Precis products.
Table 60 Collection of supported RTCM2 message
Message type
Description
1
Differential GPS Corrections
3
GPS Reference Station Parameter (X, Y, Z coordinates in ECEF coordinate
system )
18
Uncorrected Carrier phase measurements
19
Uncorrected pseudorange measurements
22
Extended Base Station
24
Reference station Antenna Reference Point Parameter (X, Y, Z coordinates in
ECEF coordinate system) with antenna height, which is more precise than
message type 3
31
Differential GLONASS Corrections
32
GLONASS Reference Station Parameters (X, Y, Z coordinates in ECEF
coordinate system)
1819
Raw Measurements