초록 ▼

A Rotary Air-data System (RADS) periodically samples pressure data from a main rotor blade mounted pitot-scoop integrated with a high accuracy pressure sensor to compute a velocity vector that is resolvable into the aircraft's coordinate system. Mathematical techniques are employed which provide acc

A Rotary Air-data System (RADS) periodically samples pressure data from a main rotor blade mounted pitot-scoop integrated with a high accuracy pressure sensor to compute a velocity vector that is resolvable into the aircraft's coordinate system. Mathematical techniques are employed which provide accurate computations of static pressure without a static pressure sensor. The RADS also computes the direction of the relative wind which is particularly useful when the pilot executes hover or low speed, low altitude maneuvers in restricted visibility. The availability of relative wind velocity information coupled with navigation data enhances the ability of rotary aircraft to perform accurate low altitude hover, fire control and other autopilot maneuvers.

대표청구항 ▼

1. A method of calculating air-speed with a sensor mounted in a rotational field comprising the steps of:i) obtaining a total pressure measurement within the rotational field; ii) calculate PT′(t); iii) extract steady state term PT0′ and 1st harmonic amplitude PT1′; iv) calculate PS from utilizing a

1. A method of calculating air-speed with a sensor mounted in a rotational field comprising the steps of:i) obtaining a total pressure measurement within the rotational field; ii) calculate PT′(t); iii) extract steady state term PT0′ and 1st harmonic amplitude PT1′; iv) calculate PS from utilizing a previously calculated VT where VT initially 0; and v) recalculating VT with PS from said step iv); and vi) repeating said steps iv) and v). 2. A method as recited in claim 1, wherein said step (i) further comprises locating the sensor on a rotor blade.3. A method as recited in claim 1, further comprising the step of: determining a relative wind direction.4. A method as recited in claim 3, further comprising the step of:a) determining anazimuth position of a high pressure peak of the total pressure measurement; b) determining a tangent of the azimuth position of said step a). 5. A method as recited in claim 4, further comprising the step of:obtaining the azimuth position of said step a) from a rotor blade position sensor. 6. A method as recited in claim 5, further comprising the step of:locating the rotor blade position sensor within a stationary field adjacent the rotational field.