Leica Geosystems GPS System 500 - Technical Reference Manual - Manual (Page 330)

330 Appendix E Technical Reference Manual-4.0.0en
Format
$XXGNS,
hhmmss.ss,
llll.ll,
a,
yyyyy.yy,
a,
c--c,
xx,
x.x,
x.x,
x.x,
x.x,
xxxx
*hh
<CR>
<LF>
GNS - GNSS Fix Data
Content
Header, message sent from Receiver. XX=GP
- GPS only, XX=GL - GLONASS only, XX=GN-
Combined GPS/GLONASS
UTC time of position
Latitude
Hemisphere “N”/“S”
Longitude
“E”/“W”
Mode Indicator
N = No Fix
A = Autonomous. GPS Nav Fix
D = Differential. DGPS Fix
P = Precise Nav (no deliberate degradation
such as SA)
R = Real Time Kinematic. RTK Fix
F = Float RTK.
Number of satellites in use, 00-99
HDOP of all satellites used in computation
Antenna altitude above/below mean sea level,
meters. Note, if no orthometric height is
available the local ell. height will be exported.
If the local ell. height is not available either, the
WGS84 ell. height will be exported.
Geoidal separation, meters
Age of Differential GPS Data, null when GPS
not used.
Differential reference station ID, 0000-1023
Checksum
Carriage Return
Line Feed
Format 1
$GPGSA,
a,
x,
xx,
x.x,
x.x,
x.x
*hh
<CR>
<LF>
Content
Header, incl. Talker ID,message sent from
Receiver
Mode
M = Manual, forced to operate in 2D or 3D
mode
A = Automatic, allowed to automatically switch
2D/ 3D
Mode
1 = Fix not available
2 = 2D
3 = 3D
PRN numbers of satellites used in solution
(this format is repeated 12 times and null for
unused fields)
PDOP
HDOP
VDOP
Checksum
Carriage Return
Line Feed
GSA - GPS DOP and Active Satellites
1 Example:
$--GSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
x.x,x.x,x.x*hh<CR><LF>