JP2002031543A - Air map display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an air map display device capable of increasing a display speed. SOLUTION: The air map display device mounted on an aircraft for displaying a map of a flying area and a compass rose directing a reference azimuth on a display screen is provided with a graphics drawing part, which draws the compass rose so that a part just above the display screen matches the reference azimuth, and a rotation computing part turning the compass rose drawn in the graphics drawing part so that the azimuth of own aircraft detected on the outside matches the part just above the display screen. An output from the rotation computing part is displayed on the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial map display device mounted on an aircraft, and more particularly to an aerial map display device for displaying a map of a flight area and a compass rose on a display screen.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a conventional aerial map display device. In FIG. 4, the aerial map display device includes a database memory 1, a drawing processing unit 2, a display processing unit 3, and a liquid crystal display unit 4.

The database memory 1 stores a map database 1a in which image information of a map of a flight area to be displayed is stored in association with a direction, and altitude data of points obtained by dividing the flight area in a mesh shape is stored in association with a direction. And an elevation database 1b.

[0004] Then, the drawing processing unit 2 includes a map drawing unit 2.
a, map temporary image memory 2b, rotation calculation unit 2c, map image memory 2d, rotation calculation unit 2e, elevation map temporary image memory 2
f, elevation map drawing section 2g, elevation map image memory 2h, graphics drawing section 2i, graphics image memory 2
j, and the display processing unit 3 includes a display control unit 3a and a display image memory 3b.

[0005] The map drawing section 2a sequentially converts map image data to be displayed on the display screen of the liquid crystal display section 4 from a position corresponding to a display dot at the upper left of the display screen.
Is read out and stored in the provisional map image memory 2b. Then, the rotation calculation unit 2c reads the image data stored in the provisional map image memory 2b, and based on the information on the direction and position of the own device obtained from, for example, the GPS, the azimuth of the device is displayed on the display screen of the liquid crystal display unit. The image data is rotated so as to be located directly above, and the result is stored in the map image memory 2d.

[0006] The rotation calculation unit 2e includes a liquid crystal display unit 4
The altitude data of the altitude map to be displayed on the display screen is read from the altitude database 1b, and the azimuth angle of the aircraft is displayed directly above the display screen of the liquid crystal display unit based on the information on the direction and position of the own aircraft obtained from, for example, GPS. Rotate to position
Further, an interpolation operation or the like is performed between the elevation data divided in a mesh shape, and the elevation data is stored in the elevation map temporary image memory 2f in association with each display dot on the display screen.

The altitude map drawing section 2g reads the altitude data stored in the altitude map temporary image memory 2f, obtains a correlation between the altitude data associated with each display dot on the display screen, and From the correlation, the altitude data of each display dot is converted into a display gradation to determine a shadow value, and stored in the altitude map image memory 2h as shadow image data to which a shadow is added.

The graphics drawing section 2i is, for example, a GP
Based on the direction and position information of the aircraft obtained from S, etc.,
As shown in FIG. 5, the compass rose 5 in which the aircraft azimuth is positioned directly above the display screen of the liquid crystal display unit and the reference azimuth (true north N) is rotated from directly above the display screen, and the graphics It is stored in the image memory 2j.

The display control unit 3a reads out the image data stored in each of the map image memory 2d, the elevation map image memory 2h, and the graphic image memory 2j, selects an image to be displayed on the display screen, and superimposes the image. Processing such as calculation and division of the display screen is performed, and the results are stored in the display image memory 3b and displayed on the liquid crystal display unit 4.

[0010]

However, in the aerial map display device as described above, the compass rose 5 is changed by changing the position of the reference azimuth every time the body information of the direction and position of the own aircraft is updated. There is a problem in that drawing is performed in the drawing unit 2i, the load on the graphics drawing unit 2i is large, and the processing time is long.

The present invention has been made in order to solve the above-described problem. After the compass rose 5 is drawn so that the position directly above the display screen coincides with the reference azimuth, the compass rose 5 is rendered in accordance with the body information. It is an object of the present invention to realize an aeronautical map display device capable of increasing the display speed by rotating and displaying.

[0012]

According to a first aspect of the present invention, there is provided an aeronautical map display device mounted on an aircraft and displaying on a display screen a map of a flight area and a compass rose indicating a reference direction. A graphics drawing unit that draws the compass rose so that the top of the display screen matches the reference azimuth, and the azimuth of the own device detected externally matches the top of the display screen. A rotation calculation unit for rotating the compass rose drawn by a graphics drawing unit, and an aerial map display device, characterized in that an output from the rotation calculation unit is displayed on the screen. is there.

According to a second aspect of the present invention, there is provided an aeronautical map display device mounted on an aircraft and displaying a map of a flight area and a compass rose indicating a reference direction on a display screen in a superimposed manner. A map database in which data is stored, and a map drawing unit that reads the image data from the map database and draws the map such that a position directly above the display screen matches the north direction of the map.
A graphics drawing unit that draws the compass rose so that the top of the display screen matches the reference orientation,
The superimposed screen on which the map drawn by the map drawing unit and the compass rose drawn by the graphics drawing unit are superimposed, the azimuth of the own device detected externally being right above the display screen. An aerial map display device, comprising: a rotation operation unit for performing rotation so as to coincide with each other; and displaying an output from the rotation operation unit on the display screen.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention.

In FIG. 1, 2k is a graphics temporary image memory, and 2l is a rotation operation unit. As shown in FIG. 2, the graphics drawing unit 2i draws the compass rose 5 so that the reference azimuth (true north N) is directly above the display screen irrespective of the body information, and the graphics temporary image memory 2k
To be stored.

The rotation calculation unit 21 reads the image data of the compass rose 5 stored in the temporary graphics image memory 2k and, based on the body information of the direction and position of the own machine obtained from, for example, GPS, as shown in FIG. As shown in, the image data of the compass rose 5 is rotated so that the aircraft azimuth is located directly above the display screen of the liquid crystal display unit 4,
The result is stored in the graphics image memory 2j.

Such an aerial map display device does not draw the compass rose 5 every time the airframe information is updated, and displays the drawn compass rose 5 by rotating it so that the reference azimuth is different every time the airframe information is updated. Therefore, the load on the graphics drawing unit 2e is reduced, and the display speed can be increased.

FIG. 3 is a block diagram showing the configuration of the second embodiment of the present invention. In the following drawings, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In FIG. 3, 2m is a superimposed temporary image memory, 2n is a rotation operation unit, and 2o is a superimposed image memory.

The superimposed image temporary memory 2m includes a map drawing section 2a.
Image data of the map drawn in step 2 and the graphic drawing unit 2
2, the image data of the compass rose 5 whose reference azimuth is fixed right above as shown in FIG. 2 is superimposed and stored, and the rotation operation unit 2n stores the map and the compass in the superimposed image temporary memory 2m. The image data on which the rose 5 is superimposed is read, and superimposed so that the aircraft azimuth is located directly above the display screen of the liquid crystal display unit 4 based on the aircraft information of the direction and position of the aircraft obtained from, for example, GPS. The rotated image data is rotated, and the result is stored in the superimposed image memory 2o.

The display control unit 3a reads the image data stored in the superimposed image memory 2o and the altitude map image memory 2h, selects the image to be displayed on the display screen, calculates the superimposed display, and displays the display screen. Processing such as separation is performed, the result is stored in the display image memory 3b, and the display is performed on the liquid crystal display unit 4.

In such an aerial map display device,
The map temporary image memory 2b and the graphics temporary image memory 2k shown in FIG. 1 are integrated and replaced with a superimposed image temporary memory 2m, and the rotation calculation unit 2c and the rotation calculation unit 21 are integrated and replaced with a rotation calculation unit 2n. Therefore, the number of circuit components can be reduced, and the size and the power consumption of the aerial map display device can be reduced.

[0022]

As described above, according to the first aspect of the present invention, the compass rose is not drawn every time the body information is updated, and the reference azimuth is different every time the body information is updated. And rotate it to display
The load on the graphics drawing unit is reduced, and an aerial map display device with a high display speed can be realized.

According to the second aspect of the present invention, the map image temporary memory and the graphic image temporary memory are integrated and replaced with a superimposed image temporary memory, and the superimposed image on which the map and the compass rose are superimposed is converted into a heading direction. Is provided, the number of circuit components is reduced, and the size and power consumption of the aerial map display device can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing an image of a compass rose in which a reference direction is directly above.

FIG. 3 is a block diagram showing a configuration of a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional aerial map display device.

FIG. 5 is a diagram showing an image of a compass rose in which the heading is directly above;

[Explanation of symbols]

 1a Map database 2a Map drawing unit 2e Graphics drawing unit 2c, 2e, 2l, 2n Rotation calculation unit 5 Compass rose

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G09G 5/36 510 G09G 5/36 510B H04N 1/387 H04N 1/387

Claims (2)

[Claims] 1. An aeronautical map display device mounted on an aircraft and displaying a map of a flight area and a compass rose indicating a reference direction on a display screen, wherein a position directly above the display screen matches the reference direction. A graphics drawing unit for drawing the compass rose, and rotating the compass rose drawn by the graphics drawing unit so that the azimuth of the own device detected externally coincides with the position directly above the display screen. An aerial map display device, comprising: a rotation calculation unit configured to display an output from the rotation calculation unit on the screen. 2. An aerial map display device mounted on an aircraft and displaying a map of a flight area and a compass rose indicating a reference direction on a display screen in a superimposed manner, wherein a map database storing image data of the map is provided. A map drawing unit that reads the image data from the map database and draws the map so that the top of the display screen matches the north direction of the map; and the top of the display screen is the reference direction. A graphics drawing unit that draws the compass rose so as to match, and a superimposed screen on which the map drawn by the map drawing unit and the compass rose drawn by the graphics drawing unit are superimposed are detected externally. A rotation calculation unit that rotates the azimuth of the own device so that the azimuth angle coincides with the position directly above the display screen. The output from the rotation calculation unit Aerial map display device characterized by being configured to display on the display screen.