JP3719845B2 - POSITION DISPLAY DEVICE, POSITION DISPLAY METHOD, AND RECORDING MEDIUM - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a position display device, a position display method, and a recording medium that display the position of a moving object such as an aircraft on a map.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, GPS (Global Positioning System), INS (Inertial Navigation System), and the like have been provided as navigation devices mounted on mobile objects such as airplanes and automobiles. The position of the moving body obtained by these navigation devices is displayed on the digital map as a moving body symbol such as a circle or x mark by the position display device.
[0003]
By the way, each navigation device has its own accuracy, and the required position has an error. For this reason, since there is a deviation between the symbol displayed on the map and the true position, it is important for the user to grasp this deviation.
[0004]
Particularly recently, a compound navigation system is generally used in which a plurality of navigation devices are combined to improve accuracy and reliability. In such a system, even if one navigation device breaks down, it is backed up by another navigation device, so there is no direct hindrance to the operation, but the positioning accuracy will fluctuate significantly, so the user will be informed accordingly. is important.
[0005]
[Problems to be solved by the invention]
However, in the conventional position display device, the symbol mark such as the (○) mark is only displayed on the coordinates representing the position of the moving body, so that the user can know the accuracy of the navigation device currently in use. There wasn't. In other words, it is impossible to know how reliable the position of the moving object currently shown on the map is.
[0006]
For this reason, there is a risk of flying away from the airway or entering the flight danger airspace without any concern. Especially when such a situation occurs in a passenger aircraft, it becomes a very big problem.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to easily recognize an error in a display position, thereby improving convenience and safety for a user, a position display method, and a recording. To provide a medium.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a display for displaying a map of an area related to the operation of a moving body on a predetermined display scale, and based on the position data of the moving body obtained by a positioning device, the map In a position display device that displays a symbol mark representing the moving object at coordinates corresponding to the position of the moving object above,
An accuracy evaluation means for obtaining the current positioning accuracy of the positioning device based on data given from the positioning device, and an error length corresponding to a position measurement error in the positioning device based on the positioning accuracy obtained by the accuracy evaluation means And an error range display means for drawing a range corresponding to the error length on the map.
[0009]
If it does in this way, the position accuracy of the moving body calculated | required by positioning devices, such as a GPS / INS compound navigation apparatus, will be calculated | required by an accuracy evaluation means. The length on the map corresponding to this accuracy is obtained by the error calculation means as the error length. Then, the error range display means draws an area having a width corresponding to the error length, such as a circle centered on the moving object symbol and having a radius of the error length, on the map.
[0010]
Therefore, the user can recognize at a glance how much error the position of the currently displayed mobile symbol has, which is very convenient. The accuracy (error) changes every moment depending on the reception state of radio waves, and the size of the error range (drawing circle) also changes accordingly. Also, for example, if the GPS portion of the compound navigation device fails, the accuracy evaluation means immediately recognizes that the positioning accuracy has changed (decreased), and the drawing circle increases, and the user indicates that the accuracy has changed. You will be able to know immediately, so you are safe.
[0011]
Further, the positioning error may be obtained in a plurality of stages such as 50% and 95%, for example, and a plurality of circles may be drawn according to this. In addition to drawing a circle, for example, it may be filled with a color different from the background, or the error stage may be divided into a number of colors, and each color may be divided and displayed in gradation.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a configuration of a position display device according to an embodiment of the present invention. That is, this position display device guides and analyzes the measurement data related to the latitude and longitude from the navigation unit 1 to the processing unit 3 via the reception unit 2, and moves the mobile symbol to the coordinates representing the latitude and longitude of the display unit 5. Is displayed.
[0013]
The navigation unit 1 includes an INS device 1a and a GPS device 1b, and is a so-called GPS / INS combined navigation device. Further, map information in the vicinity of the moving object position is read from the map database 4b stored in the storage unit 4, and is displayed as a digital map on the background of the moving object symbol.
[0014]
Here, as a characteristic configuration according to the present embodiment, the processing unit 3 includes an accuracy evaluation unit 3a and a display control unit 3b. The storage unit 4 stores a default value of accuracy data (accuracy default value 4a) related to position display.
[0015]
Based on information (accuracy data) such as the current position, the operating state of the INS device 1a and the GPS device 1b, the reception state of radio waves, especially the INS device 1a, the elapsed time since startup, etc. The positioning accuracy in the unit 1 is evaluated. If accuracy data cannot be obtained for some reason, the default value of accuracy data based on the navigation currently in use is read from the storage means 4, and the positioning accuracy is determined based on this.
[0016]
The display control means 3b displays an error circle representing the error range of the symbol display position on the digital map of the display 5 based on the obtained accuracy data. The accuracy evaluation unit 3a and the display control unit 3b are processing functions that are realized as programs stored in a recording medium such as a program memory or a floppy disk.
[0017]
In the above configuration, a processing procedure in the processing unit 3 will be described with reference to FIG. The processing unit 3 first obtains latitude data and longitude data from the navigation unit 1 in step ST21, and determines the display position of the moving object symbol on the digital map based on both data in step ST22.
[0018]
In step ST23, the processing unit 3 obtains accuracy data from the navigation unit 1 and display scale data of a digital map determined according to the user's operation.
[0019]
In the next step ST24, the processing unit 3 calculates the error radius R based on the accuracy data and the display scale. The error radius R changes dynamically according to the accuracy data and the display scale.
[0020]
When the error radius R is obtained, the processing unit 3 draws an error circle on the digital map in step ST25. This error circle is a circle with a radius R centered on the moving object symbol, and indicates an error range of the symbol display position.
[0021]
Here, a display example of the error circle is shown in FIG. Centering on the moving object symbol represented by (◯), it may be surrounded by a solid line as shown in FIG. 3A or surrounded by a dotted line as shown in FIG. Alternatively, two circles may be drawn as shown in FIG. 3C by obtaining accuracy data in two stages (for example, 95%, 50%, etc.) and obtaining an error radius corresponding to each.
[0022]
FIG. 4 shows a display example on the display 5. In addition to the position of the aircraft, its accuracy is clearly shown by the error circle. Here, as indicated by DZ in the figure, when a dangerous flight area (military exercise airspace, etc.) has been set, when the aircraft flies along the air route L, an error circle is applied to the dangerous flight area DZ. (A in the figure). Looking at this, the pilot may perform an avoidance operation as indicated by the white arrow in the figure (B in the figure).
[0023]
In the past, since the error circle was not displayed, the pilot could not recognize the position accuracy that changes every moment, and even though it was flying along the airline on the display, it had already entered the dangerous flight zone DZ. There was a fear. On the other hand, in the present embodiment, an error circle is displayed, and the radius R changes every moment according to accuracy, so that the pilot can fly in consideration of the safety factor corresponding to that time.
[0024]
Thus, in this embodiment, when the position information obtained by the navigation device is displayed on the digital map, an error radius R determined by the accuracy and scale ratio of the navigation device is obtained, and the radius R centered on the position symbol of the moving object is obtained. Circles are displayed at the same time. In this way, the user can know how much error the current display position has, avoiding entry into a dangerous area or leaving the airway. You can avoid it. In addition, since it is possible to give a great sense of security to the pilot, it is possible to perform a flight with a margin.
[0025]
The present invention is not limited to the above embodiment.
In the present embodiment, a circle with an error radius R is drawn, but the inside of the circle may be painted with a color different from the background, or as the error moves from the moving object symbol to the circumference. A gradation may be added. In addition, the inside of the circle may not be filled, for example, it may be covered with diagonal lines.
[0026]
The shape of the area indicating the error range is not limited to a circle, and may be an arbitrary shape when the error changes for each direction.
Further, when the obtained error value is large or the error circle overlaps the flight prohibited airspace, a warning may be issued to notify the pilot to that effect.
[0027]
Moreover, although the said embodiment demonstrated the aircraft as an example, this invention is applicable also to other mobile bodies, such as a motor vehicle and a ship.
In addition, various modifications can be made without departing from the scope of the present invention.
[0028]
【The invention's effect】
As described above in detail, the present invention obtains the current positioning accuracy of the positioning device, calculates the error length corresponding to the position measurement error in the positioning device based on the positioning accuracy based on the display scale of the map, Since the range corresponding to the error length is drawn on the map as, for example, a circle, the display position error can be easily recognized, thereby improving the convenience and safety for the user. An apparatus, a position display method, and a recording medium can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a position display device according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a processing procedure of the position display device according to the embodiment of the present invention.
FIG. 3 is a diagram showing a display example in the position display device according to the embodiment of the present invention.
FIG. 4 is a diagram showing an example of a display screen on the position display device according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Navigation part 1a ... INS apparatus 1b ... GPS apparatus 2 ... Reception part 3 ... Processing part 3a ... Accuracy evaluation means 3b ... Display control means 4 ... Memory | storage part 4a ... Accuracy default value 4b ... Map database 5 ... Indicator R ... Error Radius S ... Moving object symbol L ... Airway DZ ... Flight dangerous airspace A ... Display circle before evacuation B ... Display circle after evacuation

Claims (9)

Coordinates corresponding to the position of the mobile body on the map are provided with a display for displaying a map of the area related to the operation of the mobile body on a predetermined display scale, based on the position data of the mobile body obtained by a positioning device In a position display device for displaying a symbol mark representing the moving body on
Based on data given from the positioning device, accuracy evaluation means for obtaining the current positioning accuracy of the positioning device;
Based on the positioning accuracy obtained by the accuracy evaluation means, an error calculation means for calculating an error length corresponding to a position measurement error in the positioning device based on a display scale of the map;
Comprising the error range display means for drawing a range corresponding to the error length on the map,
The error calculation means calculates a plurality of error lengths according to values over a plurality of stages of the positioning accuracy,
The position display device, wherein the error range display means draws a plurality of ranges corresponding to the plurality of error lengths on the map . 2. The position display device according to claim 1, wherein the error range display means draws a plurality of circles centered on the symbol mark and having a radius of each of the plurality of error lengths on the map. . 3. The position display device according to claim 2, wherein the inside of the plurality of circles is displayed in a color-coded color . Coordinates corresponding to the position of the mobile object on the map are provided with a display for displaying a map of the area related to the operation of the mobile object on a predetermined display scale, based on the position data of the mobile object obtained by the positioning device A position display method in a position display device for displaying a symbol mark representing the moving body,
A first step of determining a current positioning accuracy of the positioning device based on data provided from the positioning device;
A second step of calculating an error length corresponding to a position measurement error in the positioning device based on the positioning accuracy determined in the first step based on the display scale of the map;
And a third step of drawing a range corresponding to the error length on the map,
The second step is a step of calculating a plurality of error lengths according to values over a plurality of stages of the positioning accuracy,
The position display method according to claim 3, wherein the third step is a step of drawing a plurality of ranges corresponding to the plurality of error lengths on the map. 5. The position display method according to claim 4, wherein the third step draws a plurality of circles centered on the symbol mark and having a radius of each of the plurality of error lengths on the map. . 6. The position display method according to claim 5, wherein the inside of the plurality of circles is displayed in a color-coded color. Coordinates corresponding to the position of the mobile object on the map are provided with a display for displaying a map of the area related to the operation of the mobile object on a predetermined display scale, based on the position data of the mobile object obtained by the positioning device A recording medium on which is recorded a program for causing a computer to execute a processing function in a position display device that displays a symbol mark representing the moving body.
In the computer,
Based on the data given from the positioning device, to execute a first processing function to obtain the current positioning accuracy of the positioning device,
Based on the positioning accuracy obtained by the first processing function, a second processing function for calculating an error length corresponding to a position measurement error in the positioning device based on the display scale of the map is executed.
A program for executing a third processing function for drawing a range corresponding to the error length on the map,
The second processing function calculates a plurality of error lengths according to values over a plurality of stages of the positioning accuracy, and the third processing function corresponds to the plurality of error lengths. A recording medium on which a program for drawing a plurality of ranges on the map is recorded. 8. The recording medium according to claim 7, wherein the third processing function draws a plurality of circles centered on the symbol mark and having a radius of each of the plurality of error lengths on the map. . 9. The recording medium according to claim 8, wherein the inside of the plurality of circles is displayed in a color-coded color.

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