2.4 GST Data Message
The GST message contains Global Navigation Satellite System (GNSS)
psuedorange error statistics. Table 2-5, breaks down the GST message into
its components. This message has the following format:
$GPGST,hhmmss.ss,a.a,b.b,c.c,d.d,e.e,f.f,g.g *cc<CR><LF>
Table 2-5 GST Data Message Defined
Field Description
hhmmss.ss UTC time in hours, minutes, seconds of the GPS position
a.a Root mean square (rms) value of the standard deviation of the range inputs to the
navigation process. Range inputs include pseudoranges and differential GNSS
(DGNSS) corrections
b.b Standard deviation of semi-major axis of error ellipse (meters)
c.c Standard deviation of semi-minor axis of error ellipse (meters)
d.d Orientation of semi-major axis of error ellipse (meters)
e.e Standard deviation of latitude error (meters)
f.f Standard deviation of longitude error (meters)
g.g Standard deviation of altitude error (meters)
*cc Checksum
<CR><LF> Carriage return and line feed
2.5 GSV Data Message
The GSV message contains GPS satellite information. Null fields occur
where data is not available due to the number of satellites tracked. Table 2-
6 breaks down the GSV data message into its components. This message
has the following format:
$GPGSV,t,m,n,ii,ee,aaa,ss,…ii,ee,aaa,ss,*cc<CR><LF>
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