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[Paparazzi-devel] UTM Zone Management

From: gisela.noci
Subject: [Paparazzi-devel] UTM Zone Management
Date: Tue, 7 Apr 2009 18:04:53 +0200

I would like to understand how the Paparazzi autopilot manages crossing UTM Zones. I have studied the source code and cannot see that this is catered for, unless one uses the Lat/Long supplied by the GPS. I am reluctant to do that as the conversion of lat/long to UTM loads the processor (it is not a trivial computation). As I understand, the Nav function in Paparazzi works with a coordinate system based on a georef point whose (x.y) is set to be zero. All waypoints, aircraft position etc are then assigned coordinates relative to this point. This is a fantastic way of working – just needs to be able to handle receiving a UTM eastings value from the GPS which is in a different zone.


Hence please if someone can explain how this is managed in Paparazzi it would be much appreciated.

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