Product Manual

107
GRS: GNSS Range Residuals
$--GRS,m1,d2,n(f3)*cc
GSA: GNSS DOP and Active Satellites
$--GSA,c1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,d12,d13,d14,f15,f16,f17*cc
Parameter Description Range
“$--GRS”
Header
$GPGRS: Only GPS satellites are used.
$GLGRS: Only GLONASS satellites are used.
$GNGRS: Several constellations (GPS, SBAS,
GLONASS) are used.
$GBGRS: Only BeiDou satellites are used.
$GNGRS: Several constellations are used (GPS,
SBAS, GLONASS, QZSS, BeiDou)
$GPGRS
$GLGRS
$GBGRS
$GNGRS
m1 Current UTC time of GGA position (hhmmss.ss)
000000.00-
235959.99
d2 Mode used to compute range residuals Always “1”
f3
Range residual for satellite used in position computa-
tion (repeated “n” times, where n is the number of sat-
ellites used in position computation). Residuals are
listed in the same order as the satellites in the GSA
message so that each residual provided can easily be
associated with the right satellite.
±999.999
*cc Checksum *00-*FF
Parameter Description Range
“$--GSA”
Header
$GPGSA: Only GPS satellites are used.
$GLGSA: Only GLONASS sats are used.
$GBGSA: Only BEIDOU sats are used
$GNGSA: Several constellations (GPS,
SBAS, GLONASS, BEIDOU) are used.
$GPGSA, $GLGSA,
$GBGSA, $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: 1-44
GALILEO: 1-30
QZSS: 1-5
BEIDOU: 1-35
IRNSS: 1-7
f15 PDOP 0-9.9
f16 HDOP 0-9.9
f17 VDOP 0-9.9
*cc Checksum *00-*FF