infrared Sensor Alternatives

Hi everyone,I'm just starting to compile the list of equipment that I'll need to get my UAV project off the ground. My problem is that I intend to use my UAV in mountainous terrain and therefore Infrared horizon sensing circuits seem inappropriate. So my questions is what are my alternatives? Are there inexpensive IMUs that would allow me to do this using only accelerometers, gyros, and a GPS setup? Thanks for any input you guys can provide.-dan

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