Table 40: Gps Dop And Active Satellite Sentence; Table 41: Gps-Satellites-In-View Sentence - NorthStar 8700 Technical Reference Manual

$GPGSA,A,3,14,22,03,09,08,29,17,,,,,,2.7,2.2,1.6*3A<CR><LF>
05/01/97 REV H

Table 40: GPS DOP and active satellite sentence

Data field Contents
$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx.x,
xx.x,xx.x*hh<CR><LF>
Mode. M = manual, forced to operate in 2-D or 3-D
a
mode; A = automatic, allowed to automatically
switch 2-D/3-D.
Mode. 1 = fix unavailable; 2 = 2-D; 3 = 3-D.
x
PRNs of SVs used. PRN numbers of satellites used in
xx,xx,xx,
solution (null for unused fields).
xx,xx,xx,
xx,xx,xx,
xx,xx,xx
PDOP
xx.x
HDOP
xx.x
VDOP
xx.x
Example O:
In this example, mode is Automatic/3-D; SVs used are PRNs 14, 22, 03, 09,
08, 29, and 17; PDOP is 2.7; HDOP is 2.2; and VDOP is 1.6.
GPS satellites in view ($GPGSV)
This message provides number of SVs in view, PRN numbers, elevation,
azimuth, and SNR values. The first sentence can have four satellites max-
imum per transmission, and additional satellite data is sent in the second
or third sentence.

Table 41: GPS-satellites-in-view sentence

Data field Contents
$GPGSV,x,x,xx,xx,xx,xxx,xx.x..........,xx,xx,xxx,xx.
x*hh<CR><LF>
Total number of messages, 1 to 3
x
Message number, 1 to 3
x
Total number of satellites in view
xx
Satellite PRN number
xx
Elevation in degrees (elevation range 00 to 90
xx
degrees)
Section 10 - NMEA protocols
PAGE 57