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MiLLennium Command Descriptions Manual 133
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 status reject noise time update
parameters covariance *xx [CR][LF]
Field # Field type Data Description Example
1 $CLMA Log header $CLMA
2 status Status of clock model (0 = good;
-1 to -20 = bad)
0
3 reject Number of rejected range bias
measurements (max. = 5)
0
4 noise time GPS time of last estimate
(seconds)
- since Jan. 3, 1980 -
5.113140990E+010
5 update GPS time of last update
(seconds)
- since Jan. 3, 1980 -
5.113140990E+010
6 - 8 parameters Parameters array (1 x 3 = 3
elements)
5.810550069E+003, -1.07377180E+002, -1.41936974E+002
9 - 17 covariance Covariance matrix (3x3 = 9
elements), listed left-to-right by
rows
9.744136534E+004, 1.676933050E+003, -8.98776739E+004,
1.676933050E+003, 4.750666170E+002, -7.06077622E+002,
-8.98776739E+004, -7.06077622E+002, 8.996728013E+004
18 *xx Checksum *00
19 [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