Speedometer insensitive to icy conditions and heavy rainfall
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United States of America Patent
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Sep 5, 2017
Issued Date -
N/A
app pub date -
Jul 27, 2012
filing date -
Aug 4, 2011
priority date (Note) -
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Abstract
The present invention relates to a speed measurement system allowing the relative speed V of a moving body in relation to an ambient air mass to be measured independently of the atmospheric conditions, the moving body being designed to move at least at subsonic and transonic speeds. The speed measurement system comprises:
- a fin of elongate shape positioned in the ambient air mass and the profile of which comprises a portion A and a portion B, at least one heating means, at least one dynamic-pressure tap PB situated in the portion B, an angle BETA defined between the axis OX and intrados or extrados of the portion A of the fin;at least one static-pressure tap PSat least one means of measuring and/or calculating the angle of attack and possibly at least one means of measuring and/or calculating the sideslip angle,at least one calculation means configured to determine the speed V of the moving body with respect to the ambient air mass (7) from the static pressure PS and dynamic pressure PB values and possibly from the value of the angle of attack ALPHA of the fin and/or the sideslip angle GAMMA, and do so in an injective, univocal manner throughout the subsonic and transonic domain.
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