SAE Standards Works
A-21 Aircraft Noise Measure Noise Aviation Emission Modeling
AIR902A - Determination of Minimum Distance from Ground Observer to Aircraft for Acoustic Tests
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Determination of Minimum Distance from Ground Observer to Aircraft for Acoustic Tests
A photographic technique is described for determining minimum observer-to-aircraft distances during acoustic "fly-over" tests. Possible sources of error are discussed, and it is shown that with ordinary care results are sufficiently accurate to require no correction.
The current standard relies on the use of photographic film. The proposed revision uses methods of determining distances from digital images.