SL869 SW User Guide
1VV0301002 Rev.6 – 2013-10-1
Reproduction forbidden without written authorization from Telit Communications S.p.A.- All Rights Reserved.
Page 22 of 25
Mod. 0806 2011-07 Rev.2
4.2.
GNGSA
This message reports Dilution of Precision (DOP) values and the PRN codes of the active
satellites used in the position fix. Two of these messages are output each second, one listing
the GPS satellites, the other listing the GLONASS satellites. Both messages contain DOP
values for the combined GPS and GLONASS geometry.
Format
:
$GNGSA,<Mode1>,<Mode2>,[<SatPRN1>],...,[<SatPRNn>],<PDOP>,
<HDOP>,<VDOP>*<checksum><cr><lf>
Parameter
Format
Description
Mode1
“M” or “A”
M – Manual, forced to operate in 3D mode
A – Automatic, allowed to switch between 2D and 3D mode
Mode2
Decimal, 1 digit
1 – No fix available
1 – 2D fix
2 – 3D fix
SatPRN1…
SatPRNn
Decimal, 2 digits
List of GPS satellite PRN codes, or list of GLONASS satellite
PRN codes, used in the position fix.
PDOP
PP.P
Position Dilution of Precision, maximum of 99.0
HDOP
HH.H
Horizontal Dilution of Precision, maximum of 99.0
VDOP
VV.V
Vertical Dilution of Precision, maximum of 99.0
Example
:
$GNGSA,A,3,25,11,01,18,12,32,31,22,14,30,,,1.2,0.7,0.9*28
$GNGSA,A,3,65,66,76,75,72,,,,,,,,1.2,0.7,0.9*24
