Novatel OM-20000041 用户手册
D
Logs summary
218
MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
TM1A/B
Time of 1PPS
This log provides the time of the GPSCard 1PPS, normally high, active low pulse (1 millisecond), where falling
edge is reference, in GPS week number and seconds into the week. The TM1A/B log follows a 1PPS pulse. It also
includes the receiver clock offset, the standard deviation of the receiver clock offset and clock model status. This
log will output at a maximum rate of 1 Hz.
edge is reference, in GPS week number and seconds into the week. The TM1A/B log follows a 1PPS pulse. It also
includes the receiver clock offset, the standard deviation of the receiver clock offset and clock model status. This
log will output at a maximum rate of 1 Hz.
TM1A
Structure:
Example:
$TM1A,794,414634.999999966,-0.000000078,0.000000021,-9.999999998,0*57[CR][LF]
TM1B
Format:
Message ID = 03
Message byte count = 52
$TM1A
week
seconds
offset
offset std
utc offset
cm status
*xx
[CR][LF]
Field #
Field type
Data Description
Example
1
$TM1A
Log header
$TM1A
2
week
GPS week number
794
3
seconds
GPS seconds into the week at the epoch coincident with the 1PPS
output strobe (receiver time)
output strobe (receiver time)
414634.99999996
6
6
4
offset
Receiver clock offset, in seconds. A positive offset implies that the
receiver clock is ahead of GPS Time. To derive GPS time, use the
following formula:
GPS time = receiver time - (offset)
receiver clock is ahead of GPS Time. To derive GPS time, use the
following formula:
GPS time = receiver time - (offset)
-0.000000078
5
offset std
Standard deviation of receiver clock offset, in seconds
0.000000021
6
utc offset
This field represents the offset of GPS time from UTC time, computed
using almanac parameters. To reconstruct UTC time, algebraically
subtract this correction from field 3 above (GPS seconds).
UTC time = GPS time + (utc offset)
using almanac parameters. To reconstruct UTC time, algebraically
subtract this correction from field 3 above (GPS seconds).
UTC time = GPS time + (utc offset)
-9.999999998
7
cm status
Receiver Clock Model Status where 0 is valid and values from -20 to -1
imply that the model is in the process of stabilization
imply that the model is in the process of stabilization
0
8
*xx
Checksum
*57
9
[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
Clock offset
8
double
seconds
24
5
Stddev clock offset
8
double
seconds
32
6
UTC offset
8
double
seconds
40
7
Clock model status
4
integer
48