Novatel OM-20000041 用户手册
D
Logs summary
MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
179
PRTKA/B
Computed Position
(RTK)
This log contains the best available position computed by the receiver, along with three status flags. In addition, it
reports other status indicators, including differential lag, which is useful in predicting anomalous behavior brought
about by outages in differential corrections.
reports other status indicators, including differential lag, which is useful in predicting anomalous behavior brought
about by outages in differential corrections.
This log replaces the P20A log; it is similar, but adds extended status information. With the system operating in an
RTK mode, this log will reflect the latest low-latency solution for up to 30 seconds after reception of the last
reference station observations. After this 30 second period, the position reverts to the best solution available; the
degradation in accuracy is reflected in the standard deviation fields, and is summarized in Table 1-2, Page 17. If
the system is not operating in an RTK mode, pseudorange differential solutions continue for 60 seconds after loss
of the data link, though a different value can be set using the
RTK mode, this log will reflect the latest low-latency solution for up to 30 seconds after reception of the last
reference station observations. After this 30 second period, the position reverts to the best solution available; the
degradation in accuracy is reflected in the standard deviation fields, and is summarized in Table 1-2, Page 17. If
the system is not operating in an RTK mode, pseudorange differential solutions continue for 60 seconds after loss
of the data link, though a different value can be set using the
DGPSTIMEOUT
command.
PRTKA
Structure:
$PRTKA
week
sec
lag
#sv
#high
L1L2 #high
lat
lon
hgt
undulation
datum ID
lat
σ
lon
σ
hgt
σ
soln status
rtk status
posn type
idle
stn ID
*xx
[CR][LF]
Field #
Field type
Data Description
Example
1
$PRTKA
Log header
$PRTKA
2
week
GPS week number
872
3
sec
GPS time into the week (in seconds)
174963.00
4
lag
Differential lag in seconds
1.000
5
#sv
Number of matched satellites; may differ from the number in view.
8
6
#high
Number of matched satellites above RTK mask angle; observations from satellites
below mask are heavily de-weighted
below mask are heavily de-weighted
7
7
L1L2 #high
Number of matched satellites above RTK mask angle with both L1 and L2 available
7
8
lat
Latitude of position in current datum, in decimal fraction format. A negative sign implies
South latitude
South latitude
51.11358042429
9
lon
Longitude of position in current datum, in decimal fraction format. A negative sign
implies West longitude
implies West longitude
-114.04358006710
10
hgt
Height of position in current datum, in meters above mean sea level
1059.4105
11
undulation
Geoidal separation, in meters, where(+ve) is above ellipsoid and (-ve) is below ellipsoid
-16.2617
12
datum ID
Current datum (see Appendix G, Page 234)
61
13
lat
σ
Standard deviation of latitude solution element, in meters
0.0096
14
lon
σ
Standard deviation of longitude solution element, in meters
0.0100
15
hgt
σ
Standard deviation of height solution element, in meters
0.0112
16
soln status
Solution status (see Table D-1, Page 143)
0
17
rtk status
RTK status (see Tables D-3, D-4, Page 143)
0
18
posn type
Position type (see Table D-2, Page 143)
4
19
idle
Percent idle time, percentage
42
20
stn ID
Reference station identification (RTCM: 0 - 1023, or RTCA: 266305 - 15179385)
119
21
*xx
Checksum
*51
22
[CR][LF]
Sentence terminator
[CR][LF]