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D Logs summary
138 MiLLennium Command Descriptions Manual
ETSA/B Extended Tracking Status
These logs provide channel tracking status information for each of the GPSCard parallel channels.
NOTE: This log is intended for status display only; since some of the data elements are not synchronized
together, they are not to be used for measurement data. Please use the RGEA/B/D, SATA/B, and SVDA/B logs
to obtain synchronized data for post processing analysis.
If both the L1 and L2 signals are being tracked for a given PRN, two entries with the same PRN will appear in the
tracking status logs. As shown in Table D-5 Receiver Self Test Status Codes these entries can be differentiated by
bit 19, which is set if there are multiple observables for a given PRN, and bit 20, which denotes whether the
observation is for L1 or L2. This is to aid in parsing the data.
ETSA
Structure:
$ETSA week seconds
sol status # obs
prn ch-tr-status dopp C/No residual locktime psr reject code
:
prn ch-tr-status
dopp
C/No
residual locktime psr
reject code
*xx [CR][LF]
Field # Field type Data Description Example
1 $ETSA Log header $ETSA
2 week GPS week number 850
3 seconds GPS seconds into the week (receiver time, not corrected for clock
error, CLOCKADJUST enabled)
332087.00
4 sol status Solution status (see Table D-1) 0
5 # obs Number of observations to follow 24
6 prn Satellite PRN number (1-32) (channel 0) 7
7 ch-tr-status Hexadecimal number indicating channel tracking status (See Table
D-7)
00082E04
8 dopp Instantaneous carrier Doppler frequency (Hz) -613.5
9 C/No Carrier to noise density ratio (dB-Hz) 54.682
10 residual Residual from position filter (m) 27.617
11 locktime Number of seconds of continuous tracking (no cycle slips) 12301.4
12 psr Pseudorange measurement (m) 20257359.5
7
13 reject code Indicates whether the range is valid (code = 0) or not (see Table D-11) 0
14-21
..
94-101
..
..
..
Next PRN #,ch-tr-status,dopp,C/No,residual,locktime,psr,reject code
..
Last PRN #,ch-tr-status,dopp,C/No,residual,locktime,psr,reject code
102 *xx Checksum *19
103 [CR][LF] Sentence terminator [CR][LF]
.