| 摘要 |
A windshear warning system having an adjustable threshold to avoid triggering nuisance windshear alerts wherein the magnitude and duration of the shear are not sufficient to endanger an aircraft that is flying a landing approach at greater-than-normal approach speed. The present invention provides for variable detection times in either a variable threshold windshear detection or a fixed threshold detection system. A measurement of angle or attack is used to deduce the aircraft's approximate weight from which a normal landing approach speed may be calculated. The difference between the computed landing approach speed and the actual approach speed is used to calculate an add-on differential to the windshear system detection threshold. The add-on factor and a predetermined timing factor dependent on the power-to-weight ratio of the aircraft are combined to derive a new timing value for a variable threshold warning system which delays the windshear alert based on the magnitude of the windshear and the increase over the normal approach speed.
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