Altitude hold using ground height?

Does anyone know of a sensor (not too expensive) that could let a UAV know it’s altitude relative to the ground height not sea level? I guess what I am asking is…..
Is it possible to hold a UAV’s altitude at say 400 feet above the ground regardless of the changing height of the ground during a flight path?

Thanks

Tags: Altitude, hold

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Permalink Reply by Earl on March 10, 2009 at 9:10pm

How about the laser range finders for hunters...or....measuring tools from home depot that use laser light. another posibility might be cheep sports radar baseball units or golf swing radar things.?
Earl

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