Pilot selection criteria for the AH-64 helicopter.

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Author
Diamond, Richard C.
Date
1982Advisor
Creighton, J. W.
Henn, James
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Show full item recordAbstract
An experimental study was performed to devise a technique for measuring the
volume backscattering from sediments. This experimental technique has never been
performed in the laboratory. The volume backscattering was to be determined by
comparing the echoes returned from the sediment with the echo returned from the
water/air interface. Measurements made on echoes returned from the water/air
interface indicated that the apparatus, data acquisition system, and analysis system
were performing correctly. Two types of sediments (fine sand and aggregate gravel)
were used. The fine sand did not produce measureable volume backscattering and the
aggregate showed results that depended on the region of sediment ensonified. It is
recommended that a sediment more homogeneous than the aggregate, but with more
backscattering than the fine sand be used in future studies.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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