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Determination of Distance from Ground Observer to Aircraft for Acoustic Tests
This document describes a practical system for a user to determine observer-to-aircraft distances.
These observer-to-aircraft distances can be either closest point of approach (CPA) distances during field measurements or overhead distances during acoustic certification tests.
The system uses a digital camera to record an image of the subject aircraft.
A method of using commercial software to obtain the distance from such an image is presented.
Potential issues which may affect accuracy are discussed.
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