© Field of View 2018 GeoSnap Pro User Manual
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IDENTIFICATION TEST
If you are getting poor GPS data (i.e. PosUncrt > 2m), run the test outlined below to identify
what system(s) on your aircraft are causing a degradation of the GPS data.
•
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).
•
With everything except the GeoSnap still powered off, let the system sit for 3-5 minutes
to allow the GPS on the GeoSnap to stabilize and to get a good baseline dataset.
•
Power on the rest of the systems on the aircraft and press the GeoSnap onboard button
twice to turn on and off triggering (this is to trigger one image to act as a timestamp to
mark when you powered on the rest of the systems).
•
Let the system sit for 3-5 more minutes with everything powered on.
•
If using a multicopter, trigger another single image (to act as another timestamp) with
the GeoSnap by pressing the onboard button twice, then set the multicopter motors to
idle (making sure you take appropriate safety measures around the spinning propellers).
•
Let the system sit for another 3-5 minutes with everything powered on and the motors
running.
•
At this point, use the button on the GeoSnap to start triggering (if using a multicopter,
turn off the motors if necessary to safely access the GeoSnap then, once the triggering is
started, set the motors back to idle).
•
Let the system sit for 3-5 more minutes with everything powered on, the motors
running, and the camera taking images.
•
Power everything down.
•
Remove the GeoSnap
’s
microSD card, plug it into your computer and open the IMG and
FLT logs.
•
In the IMG log, make note of the gstime (located after the yaw column) of the first three
images (i.e. when you powered on the rest of the systems, when you started the
motors, and when you started triggering).
•
In the FLT log, look at the PosUncrt column. It should start out with fairly high
uncertainties (≈15
-
20m) that rapidly decrease and stabilize at uncertainties ≤2m (ideally
≤1m) when just the GeoSnap is powered on.
•
Scroll down until you find the gstime in the FLT log that corresponds to when the rest of
the systems on the aircraft were powered on. Look at the PosUncrt column to see if the
uncertainties increase noticeably after that point.
•
Do the same process with the gstimes corresponding to when the motors were started
and when camera triggering was started.
•
If the uncertainties increase noticeably after any of the marked occurrences (i.e.
systems powered on, motors started, or camera triggering started), perform the GPS
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