Barometer & Altimeter
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.
Gordon Varney wrote:
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