MX575A/B DGPS Compass
46
(4)
GSA
– GPS DOP and Active Satellites
GPS receiver operating mode, satellites used in the navigation solution reported
by the $GPGGA sentence, and DOP values.
$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Notes: 1----- Mode: M = Manual, forced to operate in 2D or 3D
Mode
A = Automatic, allowed to automatically switch
2D/3D
2 ------ Mode: 1 = Fix not available, 2 = 2D, 3 = 3D
3-14 -- PRN numbers of satellites used in solution (null for unused
fields)
15 ---- PDOP
16 ---- HDOP
17 -----VDOP
(5)
GST
- GNSS Pseudorange Error Statistics
This message is used to support Receiver Autonomous Integrity Monitoring
(RAIM). Pseudorange measurement error statistics can be translated in the
position domain in order to give statistical measures of the quality of the position
solution.
If only GPS, GLONASS, etc. is used for the reported position solution, the talker
ID is GP, GL, etc., and the error data pertains to the individual system. If satellites
from multiple systems are used to obtain the reported position solution, the talker
ID is GN and the errors pertain to the combined solution.
$GPGST,hhmmss.ss,x.x,x.x,x.x,x.x,x.x,x.x,x.x*hh<CR><LF>
1 2 3 4 5 6 7 8
Notes: 1 - UTC time of the GGA or GNS fix associated with this sentence.
2 - RMS value of the standard deviation of the range inputs to the
navigation process. Range inputs include preudoranges & DGNSS
corrections.
3 - Standard deviation of semi-major axis of error ellipse (meters)
4 - Standard deviation of semi-minor axis of error ellipse (meters)
5 - Orientation of semi-major axis of error ellipse (degrees from true
north)
6 - Standard deviation of latitude error (meters)
