Avionics Altitude Sensor

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hey guys,

i'm in process of building second arduino rc airplane (not quadcopter) , incorporate altitude sensor terrain following autopilot feature. here constraints:

1.) if it's proximity sensor, has able reliably detect distance between ground , plane 6 inches @ least 10 feet.
2.) should cost less $45.

i've looked @ barometric pressure sensors, finicky (especially when introduced vibration).

if knows of sensor might able use, please let me know. i've been looking 1 months , appreciate :) .

-pb

barometric sensors not have clue ground contour.  need generates reflection ground (either ultrasonic or radar type) determine altitude above ground.  not sure find in price range - ultrasonic cheaper, need bunch of testing see how responds tall grass example (which may absorb of signal) etc.  bottom line though either need gives ground reflection or (much more expensive) knows absolute position , has built in terrain map can fly based on map information).


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