© Field of View 2018 GeoSnap Pro User Manual
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TROUBLESHOOTING
GPS signal quality test
There are a variety of transmitters and components on an aircraft that can degrade the GPS
signal received by the antenna if it is placed in a poor spot and cause you to log poor GPS data in
your FLT and IMG log files. Because of this, it is best to test your setup for GPS signal quality
after installing your GeoSnap on your aircraft.
BASIC TEST
To run a quick test to identify if you are getting good GPS data, perform the steps outlined in
this section.
•
Set the GeoSnap to the bench test settings (i.e. button toggle).
•
With everything installed on your aircraft, place it outside in an area that has a clear
view of the sky (i.e. in a clear open area, not near tall buildings, trees, or power lines).
•
Power on the GeoSnap and wait for it to get a GPS lock (signified by the green LED on
the GeoSnap control module flashing rapidly).
•
Start image triggering on the GeoSnap by pressing the onboard button.
•
Power on the rest of the systems on the aircraft (including any video transmitters) on
the aircraft and, if using a multicopter, set the motors to idle (make sure you take
appropriate safety measures around the spinning propellers).
•
Let the system sit for 3-5 minutes to allow the GPS on the GeoSnap to stabilize and to
get a good dataset.
•
Power everything down.
•
Remove the GeoSnap
’s
microSD card, plug it into your computer and open the FLT log.
•
Look at the PosUncrt column in the FLT log. It should start out with fairly high
uncertainties (≈15
-
20m) that rapidly decrease and stabilize at uncertainties ≤2m (ideally
≤1m).
•
If the PosUncrt stabilizes at a value greater than 2m, there is likely some interference
happening with the GPS signal and further testing will have to be performed to identify
what on the aircraft may be causing the issue.
Summary of Contents for GeoSnap Pro
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