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.
SAE AIR902A-2022 history
2022SAE AIR902A-2022 Determination of Distance from Ground Observer to Aircraft for Acoustic Tests
2017SAE AIR902A-2017 Determination of Distance from Ground Observer to Aircraft for Acoustic Tests
2007SAE AIR902-2007 Determination of Minimum Distance from Ground Observer to Aircraft for Acoustic Tests
1966SAE AIR902-1966 Determination of Minimum Distance from Ground Observer to Aircraft for Acoustic Tests