T801-4 Installation and Operation Manual
Programming
45
© Tait Electronics Limited September 2007
SV’s In View, SV’s
Used
SV’s in view
is the number of space vehicles theoretically in view if there
were no obstructions.
SV’s used
is the number of space vehicles actually
being used for the GPS fix.
GGA String
A green LED indicates that a “GPS fix data” packet has been received.
GSA String
A green LED indicates that a “GPS dilution of precision (DOP) and active
satellites” packet has been received.
GSV String
A green LED indicates that a “GPS satellites in view” packet has been
received.
RMC String
A green LED indicates that a “recommended minimum specific GPS/transit
data” packet has been received. This is used for date and time information.
TPS String
A proprietary NMEA 0183 data message determined by the manufacturer
of the GPS receiver.
PPS Fix
A green LED indicates that the system has established its geographical
position and is transmitting a valid PPS signal. The GPS receiver will report
if the PPS is not valid, and the LED will then change to red.
SV
The identification number of the individual space vehicle.
ELV
The SV’s elevation with respect to the location of the GPS antenna.
AZM
The SV’s compass bearing from true North with respect to the location of
the GPS antenna.
SN
The signal-to-noise ratio of the signal from the SV.
Note
The figures in the SV status table indicate whether or not SVs are
available for use. Generally the SN figure needs to be greater than
28 before the SV figures are used.
Options Menu
Select Options > Set PC Clock to set the time on the computer to the
correct time (for the time zone selected in the computer’s operating system).
You can only do this if a tracking fix has been established.
Select Options > Log to view the elapsed time with and without a tracking
fix. This is timed from the start of the current ET session.
