piclist 2002\09\04\190224a >
Thread: Barometer & Altimeter
www.piclist.com/techref/index.htm?key=barometer+altimeter
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face BY : M. Adam Davis email (remove spam text)



You are correct.  You cannot get both values out of a pressure sensor
unless you hold one of those values constant by not moving or by
stopping the weather changes (ie, getting a report from a local,
stationary pressure at a known altitude and compensating yours with it).

You can get a semi-useful altitude reading from a GPS unit, but they
have much worse altitude error than their location error (ie, +/- 100ft
as opposed to +/- 10ft).

What is the application/acceptable error rate (ie, +/- 1ft/hour is
allowed, etc)?  You can always integrate accelerometers and gyros to
find relative position (dead reckoning).  DGPS and WAAS can correct a
GPS signal so you have better resolution, etc.

-Adam

Gordon Varney wrote:

{Quote hidden}

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