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[Paparazzi-devel] GPS/UTM conversion issues in Utah

From: Austin Jensen
Subject: [Paparazzi-devel] GPS/UTM conversion issues in Utah
Date: Tue, 3 Feb 2009 18:33:46 -0700

Hey we just noticed a problem with what we though was a problem with commiting waypoints but we think it actually might be an issue with converting from GPS to UTM. Here's what happens...

If we make a flight plan over here in Utah (lat0="41.81554" lon0="-111.98160") and try to change the location of a waypoint, the waypoint is actually changed on the aircraft to some crazy value (x=226 y=28285 from the origin). And it doesn't matter which waypoint, they all change to this value. This not only happens on the aircraft, but also in the simulator.

To try and make sure it is not a problem with some of the code we are working on, we downloaded fresh code from the paparazzi server and tried it with the TJ1 A/C. The problem did not occur if we used the origin which is originally in the versatile flight plan (lat0="43.4622" lon0="1.2729"). However, when we changed the origin in the versatile flight plan to our origin (lat0="41.81554" lon0="-111.98160") the problem occurs again.

Since the problem occurs in one area and not in the other, it seems like maybe the current code works for converting from GPS to UTM in one area but doesn't work for the other. Does anybody else have this problem?


Austin Jensen, Research Engineer
Utah Water Research Laboratory (UWRL)
Utah State University, 8200 Old Main Hill
Logan, UT, 84322-8200, USA
E: address@hidden
T: (435)797-3315

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