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D Logs Summary
178 MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2
PAVA/B Position Averaging Status
These logs are meant to be used in conjunction with the POSAVE command. If the POSAVE command has not
been issued, all fields in the PAVA/B logs except week and seconds will be zero. However, when position
averaging is underway, the various fields contain the parameters being used in the position averaging process. The
log trigger ONCHANGED is recommended, but ONTIME can also be used.
See the description of the POSAVE command, Page 111.
See also Section A.3.2 Pseudorange Algorithms, Page 68.
NOTE: All quantities are referenced to the WGS84 ellipsoid, regardless of the use of the DATUM or
USERDATUM commands, except for the height parameter (field 6). The relation between the geoid
and the WGS84 ellipsoid is the geoidal undulation, and can be obtained from the POSA/B logs.
PAVA
Structure :
Example:
$PAVA,846,145872.00,51.11381167,-114.04356455,1068.100,26.2,12.1,54.9,7,1*0C [CR][LF]
$PAVA week seconds lat
lng hgt sdlat sdlng
sdhgt time samples *xx [CR][LF]
Field # Field type Data Description Example
1 $PAVA Log header $PAVA
2 week GPS week number 846
3 seconds GPS seconds into the week 145872.00
4 lat Average WGS84 latitude (degrees) 51.11381167
5 lng Average WGS84 longitude (degrees) -114.04356455
6 hgt Average height above sea level, or geoid (m) 1068.100
7 sdlat Estimated standard deviation of the average latitude (m) 26.2
8 sdlng Estimated standard deviation of the average longitude (m) 12.1
9 sdhgt Estimated standard deviation of the average height (m) 54.9
10 time Elapsed time of averaging (s) 7
11 samples Number of samples in the average 1
12 *xx Checksum *0C
13 [CR][LF] Sentence terminator [CR][LF]