Hi,
Does anyone know of a method to accurately determine altitude up to about 1/2 mile? I've seen GPS modules that measure altitude but they are only accurate to +/-35m, which is problematic when trying to land somethingThis would be on an RC plane for an auto-pilot like device.
ETA: Actually I could use two methods, one for high altitude stuff and the other for landing (where the accuracy is super important but it doesn't need to be good to a 1/2 mile).
https://www.sparkfun.com/commerce/product_info.php?products_id=8128
Senses down to a difference of 9cm in still air!
Has ADC on board with a noise filter. Vibration noise is very significant in many sensors, in fact due to the weight of the sensing diaphragm other devices may read off by 100ft if flipped upside down from their initial calibration. Not so with this one.
BUT... this depends on getting a decent "static air" source and sealing that path around the device. Ram air (pitot) pressure of a forward-facing port can add hundreds of feet at high speed and will vary based on speed. A static air port is placed so it will give atmospheric pressure unaffected by speed. In fact the difference between pitot and static port pressure is how an airspeed gauge works.
The IR looks promising. I've also been looking at inclinometers on digikey to combine them with (distance to ground perpendicular fuselage axis + inclinometer = actual distance to ground). Any links to sonar based UAV's?
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