Using the GNSS Module
ThinkRF R5750 Real-Time Signal Analyzer User Guide
31
3.
Set the reference source to the GNSS reference clock with the following
command:
:SOURCE:REFerence:PLL GNSS
4.
Verify that the internal 10 MHz clock is disciplined by the GNSS system with the
following command:
:GNSS:REFerence?
If the system response is “
GNSS
”, the internal 10 MHz is disciplined by the GNSS
module and the GNSS module has a valid fix.
If no GNSS fix is available, the system response is “
INT
”.
Getting Real-Time Geolocation Data
You can obtain real-time GNSS position data from the R5750 GNSS module.
During data capture, the real time GNSS location context packets are sent periodically in
the VRT data stream. It is up to the host application to make use of this information.
Please refer to “Formatted GNSS Geolocation” section in the
ThinkRF R5750
Programmer’s Guide
for more information.
To obtain geolocation data:
1.
In the terminal application (for example, PuTTY), retrieve GNSS position data
with the following command:
:GNSS:POS?
The system returns the last known GNSS position by latitude (degrees),
longitude (degrees) and altitude (meters) data.
If GNSS is out of lock, the response is
“
512.000000,512.000000,67108863.968750
”.
