Anomalies Incurred by E3 Tests Made in the Near Field.

Report No. ARL-TR-1733
Authors: Arthur, Joy L.; Brown, Glenn
Date/Pages: February 1999; 50 pages
Abstract: Under realistic conditions, helicopters are exposed to electromagnetic (EM) radiation from friendly and hostile sources. The radiating source is sufficiently far away that the helicopter is in the far field of the source antenna and plane wave conditions apply. To determine how the systems and subsystems on board the helicopter are affected by electromagnetic environment effects (E3), the tests are normally performed under controlled laboratory or controlled field conditions. The tests are performed with the test object in the near field rather than in the far field zone of the source antenna. The helicopter under test is "spot" illuminated instead of being totally illuminated by plane waves. This report provides an understanding of the magnitude of the uncertainties incurred when E3 tests are performed in the near field rather than plane wave environment.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 1999