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D Logs Summary
MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2 151
CLMA/B Receiver Clock Model
The CLMA and CLMB logs contain the current clock-model matrices of the GPSCard. These logs can be both
generated and received by a GPSCard.
NOTE: Only advanced users should seek to alter the clock model parameters of a GPSCard.
Throughout the following, these symbols are used:
B = range bias (m)
BR = range bias rate (m/s)
SAB = Gauss-Markov process representing range bias error due to SA clock dither (m)
For further information, please refer to the documentation given for the clka/b log.
The standard clock model now used is as follows:
clock parameters array = [ B BR SAB]
covariance matrix =
CLMA
Structure:
$CLMA week seconds status reject noise time update
parameters covariance clock bias constellation change *xx
[CR][LF]
Field # Field type Data Description Example
1 $CLMA Log header $CLMA
2 week GPS week number 1010
3 seconds GPS seconds into the week 142281.00
4 status Status of clock model (0 = good; -1 to -
20 = bad)
0
5 reject Number of rejected range bias
measurements (max. = 5)
0
6 noise time GPS time of last estimate (seconds)
- since Jan. 3, 1980 -
6.109902810E+008
7 update GPS time of last update (seconds)
- since Jan. 3, 1980 -
6.109902810E+008
8 - 10 parameters Parameters array (1 x 3 = 3 elements) 3.004851569E+000,-7.09478374E-002,1.072025038E-001
11 - 19 covariance Covariance matrix (3x3 = 9 elements),
listed left-to-right by rows
9.018176231E+002,6.665159580E+000,
-8.93243326E+002,6.665159580E+000,6.071800102E-001,
-6.28582548E+000,-8.93243326E+002,
-6.28582548E+000,8.939683016E+002
20 clock bias last instantaneous clock bias 3.173387141E+000
21 constellation change indicates constellation change
occurred
0
22 *xx Checksum *70
23 [CR][LF] Sentence terminator [CR][LF]
σ
2
B
σ
B
σ
BR
σ
B
σ
SAB
σ
BR
σ
B
σ
BR
2
σ
BR
σ
SAB
σ
SAB
σ
B
σ
SAB
σ
BR
σ
SAB
2