ashtech HDS800, Reference Manual

Page: 513 / 678

497
Query Command Library
For more details on the $PASHS,NME command, refer to the
Set Command Library Chapter.
As an example, the command below will output GRS
messages on port A at a rate of 0.5 second:
$PASHS,NME,GRS,A,ON,0.5
GSA: GNSS DOP and Active Satellites
Function
This command is used to output a GSA message containing
data related to DOP values and satellites used in the position
solution.
Where applicable, one response line per constellation used is
returned. In this case, the returned DOP values are the same
in all response lines.
Command Format
Syntax
$PASHQ,GSA[*cc]
Response Format
Syntax
$--GSA,c1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,d12,d13,d14,f15,f16,f17*cc
Parameters
Parameter Description Range
“$--GSA”
Header
$GPGSA: Only GPS satellites are used.
$GLGSA: Only GLONASS sats are used.
$GNGSA: Several constellations (GPS,
SBAS, GLONASS) are used.
$GPGSA,
$GLGSA,
$GNGSA
c1
Output mode:
• M: Manual
• A: Automatic
M, A
d2
Position indicator:
• 1: No position available
• 2: 2D position
• 3: 3D position
1-3
d3-d14
Satellites used in the position solution (blank
fields for unused channels)
GPS: 1-32
GLONASS: 65-96
SBAS: 33-64
f15 PDOP 0-9.9
f16 HDOP 0-9.9
f17 VDOP 0-9.9
*cc Checksum *00-*FF