Novatel OM-20000041 用户手册
D
Logs summary
178
MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
POSA/B
Computed Position
This log will contain the last valid position and time calculated referenced to the
GPSA
ntenna phase centre. The
position is in geographic coordinates in degrees based on your specified datum (default is
WGS84
). The height is
referenced to mean sea level. The receiver time is in
GPS
weeks and seconds into the week. The estimated standard
deviations of the solution and current filter status are also included. See also Section A.3.2 Pseudorange
Algorithms, Page 67.
Algorithms, Page 67.
POSA
Structure:
Example:
$POSA,637,511251.00,51.11161847,-114.03922149,1072.436,-16.198,61,26.636,
6.758,78.459,0*12[CR][LF]
6.758,78.459,0*12[CR][LF]
POSB
Format:
Message ID = 01
Message byte count = 88
$POSA
week
seconds
lat
lon
hgt
undulation
datum ID
lat std
lon std
hgt std
sol status
*xx
[CR][LF]
Field #
Type
Data Description
Example
1
$POSA
Log header
$POSA
2
week
GPS week number
637
3
seconds
GPS seconds into the week
511251.00
4
lat
Latitude of position in current datum, in degrees (DD.dddddddd). A - implies South latitude
51.11161847
5
lon
Longitude of position in current datum, in degrees (DDD.dddddddd). A + implies West longitude
-114.03922149
6
hgt
Height of position in current datum, in meters with respect to mean sea level (see Figure D-2, Page
185)
185)
1072.436
7
undulation
Geoidal separation, in meters, where + is above spheroid and - is below spheroid (see Figure C-
6, Page 130)
6, Page 130)
-16.198
8
datum ID
Current datum ID # (see Table G-2, Page 234 )
61
9
lat std
Standard deviation of latitude solution element, in meters
26.636
10
lon std
Standard deviation of longitude solution element, in meters
6.758
11
hgt std
Standard deviation of height solution element, in meters
78.459
12
sol status
Solution status as listed in Table D-1
0
13
*xx
Checksum
*12
14
[CR][LF]
Sentence terminator
[CR][LF]
Field #
Data
Bytes
Format
Units
Offset
1
Sync
3
char
0
(header)
Checksum
1
char
3
Message ID
4
integer
4
Message byte count
4
integer
8
2
Week number
4
integer
weeks
12
3
Seconds of week
8
double
seconds
16
4
Latitude
8
double
degrees (+ is North, - is South)
24
5
Longitude
8
double
degrees (+ is East, - is West)
32
6
Height
8
double
meters with respect to MSL
40
7
Undulation
8
double
meters
48
8
Datum ID
4
integer
56
9
StdDev of latitude
8
double
meters
60
10
StdDev of longitude
8
double
meters
68
11
StdDev of height
8
double
meters
76
12
Solution status
4
integer
84