Using Standalone GPS
If you have not already installed your hardware, you should do that now. Please see
Chapter 2 - Installing your ZoomCell
modem if you need help.
Since you are using standalone GPS we recommend setting the modem to GNSS mode
to take advantage of both the GPS and GLONASS satellites. To set GNSS mode enter
the following command:
AT^WGNSS=1
After entering this command, power cycle the modem in order for the command to take
effect. Now set the modem for standalone positioning:
AT^WPDOM=0
Next you must decide if you want to receive the GPS reading once,
(single positioning)
or if you want to track the unit
(tracing).
For single positioning set
AT^WPDST=0
. If
you want to track the unit set
AT^WPDST=1
. If you are tracking the unit you need to set
how often you track it with the
AT^WPDFR
command. The format of the command is:
AT^WPDFR=<number of positioning operations>, <time interval in secs>
The default value is 65535 attempts in 1 second intervals or
AT^WPDFR=65535, 1
.
Next we set the quality of service parameters on the modem with the
AT^WPQOS
command. The format of the command is:
AT^WPQOS=<time limit>,<horizontal accuracy>
The
<time limit>
setting is the amount of time the unit will spend searching for the
satellite. We recommend setting the default value at 255 seconds to give the unit the
maximum time to search. The <horizontal accuracy> parameter is the accuracy of the
reading in meters. The range is from 25 meters to 1000 meters. Setting a higher value
allows the modem to lock onto a satellite quicker. Generally, setting a higher value will
not significantly affect the accuracy of your positioning but will allow faster reporting.
Now we enter
AT^WPDGP
to start the positioning. The modem will now begin
searching for satellites. Once it locates your position it will report it as follows:
^POSITION
-71.09762d,
42.34636d,52m
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