Airspeed / wind speed measurement device for aircraft, and display device for same

1. A measurement system for an aircraft, comprising:

a Doppler anemometer for simultaneously measuring airflow speeds in plural points of a beam irradiation direction at the same time;

an inertial data measurement device which measures the movement information and positional information of the aircraft, and

said Doppler anemometer provides means to measure the three-axis components of the airspeed of the aircraft, the three-axis components of the wind speed currently encountered by the aircraft, and the wind speed distribution ahead of the aircraft at the same time, by changing the beam irradiation direction of the Doppler anemometer in a time series,

wherein the measurement accuracy of the device is improved by providing means for obtaining information relating to the attitude angles, the attitude angular velocities, and the ground speed of the aircraft during measurement, from the inertial data measurement device, and for correcting the measurement values from the Doppler anemometer with said information.

2. The measurement system for an aircraft according to claim 1 , wherein the measurement accuracy of the device is improved, by providing means for obtaining positional information of the aircraft during measurement from the inertial data measurement device, and for correcting the measurement values from the Doppler anemometer with said information.

3. A display system for an aircraft, wherein the two-axis airspeed of the aircraft in a horizontal plane, the three-axis components of the wind speed currently encountered by the aircraft, and information on the wind speed distribution ahead of the aircraft, as obtained from the measurement system for an aircraft according to claim 2 are displayed simultaneously in real time.

4. The display system for an aircraft according to claim 3 , wherein the two-axis airspeed of the aircraft in a horizontal plane is displayed in the form of bars, which respectively indicate a fore/aft direction speed component and a left/right direction speed component, on two-dimensional coordinates in which the vertical axis represents the speed in the fore/aft direction and the horizontal axis represents the speed in the left/right direction, and furthermore, a speed restriction area is displayed as a rectangle on the two-dimensional coordinates.

5. The display system for an aircraft according to claim 3 , wherein the three-axis components of the wind speed currently encountered by the aircraft are displayed by representing the wind speed information in the horizontal plane by numerical values as well as by the direction and thickness of an arrow, in terms of the wind direction and wind speed, and by representing the vertical wind speed information by numerical values as well as by a rectangular bar graph, in terms of the orientation in the vertical direction and the wind speed.

6. The display system for an aircraft according to claim 3 , wherein the wind speed distribution in the region ahead of the aircraft nose in which the beam is irradiated is displayed in a fan shape, separately for a horizontal plane and a vertical plane.

7. The display system for an aircraft according to claim 6 , wherein the information on the wind speed distribution ahead of the aircraft is displayed by varying the color of the display continuously in accordance with the wind speed, using a blue color for a head wind component with respect to the aircraft, a green color for a windless state, and a red color for a tail wind component.

8. A display system for an aircraft, wherein the two-axis airspeed of the aircraft in a horizontal plane, the three-axis components of the wind speed currently encountered by the aircraft, and information on the wind speed distribution ahead of the aircraft, as obtained from the measurement system for an aircraft according to claim 1 are displayed simultaneously in real time.

9. The display system for an aircraft according to claim 8 , wherein the two-axis airspeed of the aircraft in a horizontal plane is displayed in the form of bars, which respectively indicate a fore/aft direction speed component and a left/right direction speed component, on two-dimensional coordinates in which the vertical axis represents the speed in the fore/aft direction and the horizontal axis represents the speed in the left/right direction, and furthermore, a speed restriction area is displayed as a rectangle on the two-dimensional coordinates.

10. The display system for an aircraft according to claim 8 , wherein the three-axis components of the wind speed currently encountered by the aircraft are displayed by representing the wind speed information in the horizontal plane by numerical values as well as by the direction and thickness of an arrow, in terms of the wind direction and wind speed, and by representing the vertical wind speed information by numerical values as well as by a rectangular bar graph, in terms of the orientation in the vertical direction and the wind speed.

11. The display system for an aircraft according to claim 8 , wherein the wind speed distribution in the region ahead of the aircraft nose in which the beam is irradiated is displayed in a fan shape, separately for a horizontal plane and a vertical plane.

12. The display system for an aircraft according to claim 11 , wherein the information on the wind speed distribution ahead of the aircraft is displayed by varying the color of the display continuously in accordance with the wind speed, using a blue color for a head wind component with respect to the aircraft, a green color for a windless state, and a red color for a tail wind component.