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Posted by eckern@gmail.com on May 16, 2006, 5:36 pm
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This idea is sort of far-fetched so take with a grain of salt.
Use an optical mouse with modified optics (specifically, focused at
infinity and with a better f-ratio) to measure optic flow beneath the
aircraft. Particularly you are interested in the forward/backward
angular rate. Subtract the pitch rate from your IMU. You know your
velocity over the ground pretty well from gps data. Compute altitude
from velocity and corrected forward optic flow.
Thoughts?
chris
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