This document describes a practical system to determine the observer-to-aircraft closest point of approach (CPA) distance during acoustic flyby tests. The system uses a digital camera to record an image of the test aircraft. A method converting the image to a CPA dimension is presented. Potential sources of errors are discussed.
This report documents work done to support the FAA’s development of Unmanned Aerial Systems (UAS) noise certification and noise measurement criteria...
The purpose of this study was development of new acoustic techniques suitable for use in soil. Primary consideration was given to determining the loca...
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United States Department of Transportation
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