KR0170531B1 - Digital map scrolling method of car-navigation system - Google Patents

Abstract

The present invention relates to a method for automatically scrolling and displaying a numerical map based on the position of the host vehicle.

In the vehicle navigation system which collects coordinate values of the current position point of the host vehicle and matches it to the numerical map data and displays it on the display screen, (a) based on the current position point of the collected host vehicle, A maximum plane setting step of determining a rectangular plane of an area corresponding to a screen of the indicator based on a reference point and obtaining an absolute coordinate value corresponding to the center point of the corner and side of the determined rectangular plane; (B) setting a boundary surface of a predetermined size within the set maximum surface; (C) searching for and displaying a numerical map included in the set maximum surface and displaying the same on a display screen; (D) displaying the current position of the own vehicle on the floated numerical map when the current position of the own vehicle on the floated numerical map exists within the set boundary; (E) If the present position of the host vehicle is out of the set boundary surface, the steps (a) to (c) are repeated.

Description

Numerical map scrolling method of vehicle navigation system

1 is a control block diagram according to an example of a vehicle navigation system to which the numerical map scrolling method of the present invention is applied.

(A) and (b) of FIG. 2 are diagrams for explaining the structure of the digital map and the storage form of the digital map data, respectively.

3 is a flowchart for explaining a numerical map scrolling method of a vehicle navigation system of the present invention.

4 is a view for explaining the maximum surface setting process in FIG.

FIG. 5 is a diagram for explaining a boundary setting process in FIG. 3.

* Explanation of symbols for main parts of the drawings

1: GPS satellite 2: antenna

3: GPS receiver 4: Main fisherman

5: road map data storage unit 6: eastern display unit

7: Indicator 8: Key input unit

9: gyro sensor 10: vehicle speed sensor

11: geomagnetic sensor

The present invention relates to a method of scrolling a numerical map of a vehicle navigation system, and more particularly, to a method of automatically scrolling and displaying a numerical map based on a position of a host vehicle.

In recent years, the increasing number of vehicles on the road has caused very large traffic congestion. As one way to solve such traffic congestion, a car-navigation system is under development. The most basic function of the vehicle navigation system is to accurately track the location of the driving vehicle and display it on the road map.The additional function is to provide useful information about the traffic conditions of other roads, hotels, gas stations, and public offices. There is a function to. Such a vehicle navigation system employs a plurality of sensors and uses the information provided from the stand-alone navigation system to track the location of the vehicle, a navigation system using the position information provided by the GPS satellites, and both. It is roughly classified as a hybrid navigation system incorporating the system.

1 is a control block diagram of a conventional hybrid vehicle navigation system. As shown in FIG. 1, a conventional hybrid vehicle navigation system includes a GPS receiver 3 which simultaneously receives radio waves from at least three global positioning system (GPS) satellites 1 and calculates the longitude and latitude of the point. And a map data storage unit 5 storing road map data, and a longitude and latitude data received by the GPS receiver 3 to process the current position of the own vehicle from the map data storage unit 5. A main controller 4 for matching on the data, an indicator 7 for visually displaying the current position of the host vehicle on a map, and a display driving unit for driving the indicator 7 under the control of the main controller 4; (6) and the gyro sensor 9 for detecting the relative movement angle of the host vehicle to correct the display error caused by GPS data, the geomagnetic sensor 11 for detecting the absolute direction, and the vehicle speed sensor 10 for detecting the absolute speed of the host vehicle. ). Reference numeral 2 denotes an antenna connected to the GPS receiver 3 to receive GPS data in the form of radio waves, 8 denotes a key input unit, and the key input unit 8 is displayed by the driver, for example, on a map screen. Keys for reducing or enlarging, setting the current position or destination of the vehicle and scrolling the next map screen are provided.

However, in the above-described conventional vehicle navigation system, when the own vehicle approaches the point on the boundary of the display screen, the driver has to manually operate the scroll key manually to display the following map screen on the display device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a method for scrolling a numerical map of a vehicle navigation system which automatically scrolls a map screen such that the current location of the vehicle is always located at the center of the display screen. have.

A numerical map scrolling method of a vehicle navigation system of the present invention for achieving the above object, in the vehicle navigation system for collecting the coordinate value of the current position point of the own vehicle and matching it to the numerical map data and displaying it on the display screen , (A) determine the rectangular plane of the area corresponding to the screen of the indicator on the basis of the collected current position point of the own vehicle, and obtain the absolute coordinate value corresponding to the center point of the corner and side of the determined rectangular plane; Setting a maximum surface; (B) setting a boundary surface of a predetermined size within the set maximum surface; (C) searching for and displaying a numerical map included in the set maximum surface and displaying the same on a display screen; (D) displaying the current position of the own vehicle on the floated numerical map when the current position of the own vehicle on the floated numerical map exists within the set boundary; (E) If the current position of the host vehicle is out of the set boundary surface, the steps (a) to (c) are repeated.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the numerical map scroll method of the vehicle navigation system according to the present invention.

(A) and (b) of FIG. 2 are diagrams for explaining the structure of the digital map and the storage form of the digital map data, and FIG. 3 is a flowchart for explaining the numerical map scrolling method of the vehicle navigation system of the present invention; 4 is a view for explaining the maximum surface setting process in FIG. 3, and FIG. 5 is a view for explaining the maximum surface setting process in FIG.

2 to 5, the numerical map is stored in a map data storage unit 5, which is preferably implemented as a compact disc ROM (CD-ROM), which includes a topographic map of a predetermined accumulation based on aerial photographs. On the basis of this, the geographic information required for road driving and road management is digitized (digitalized) by two-dimensional coordinate values of (x, y). These numerical maps are maintained for each third mesh, where the third mesh is divided into nationwide, for example, 1 degree longitude car and 40 minutes long latitude car to make the first mesh (approximately 80 km horizontally). The primary mesh is divided into 8 equal parts again to form a secondary mesh (approximately 10 km in length and width), and the second unit is divided into ten equal parts (approximately, 1km in width and width). These actual cubic meshes have a real coordinate system and are distinguished by unique coordinate values, which are digitized based on the coordinate axis, converted into indexes and data, and connected one-to-one in a row. The index has a reference value of the partitioned area and the size of the feature, water system, road, etc. of the area.

Next, the numerical map scrolling method of the vehicle navigation system will be described. When the vehicle navigation system starts operation, first in step S10, a flag indicating the initial position point of the host vehicle is reset. In step S12, data is collected from the GPS receiver 3, the gyro sensor 9, the vehicle speed sensor 10, and the geomagnetic sensor 11 to determine the current position of the vehicle. In step S16, it is determined whether the host vehicle is at the initial initial position. If it is in the initial position, the flow advances to step S16 to set the maximum surface (REC (a, b)) centered on the initial position point. Here, the maximum surface (REC (a, b)) refers to the size of the numerical map that can be displayed on the screen of the indicator 7, and the search for the numerical map which can be displayed is the maximum surface (REC (a, It is based on the vertices and the centers of the sides generated at the time of setting b)).

Next, the maximum surface setting process in FIG. 3 will be described with reference to FIG. 4. As shown, first, the current position point P of the host vehicle is placed and the rectangular plane REC (a, b) at a position separated by the relative distances a and b in the vertical and horizontal directions with respect to the point P. )) Is determined. At the same time, the four vertices and the center points of the four sides of the rectangular plane are determined, and each of these position points has an absolute coordinate value. Accordingly, the main control unit 4 compares the reference coordinate values of the numerical map index in the map data storage unit 5 including the absolute coordinate values, selects corresponding meshes, and displays the selected meshes on the screen of the display 7. Mark on.

In step S18, the boundary surface REC (p, q) is set based on the position point P of the host vehicle, and the boundary surface REC (p, q) is a displacement value p relative to the set maximum surface. , q). This boundary (REC (p, q)) is set to prevent the numerical map screen from continuously changing. The boundary (REC (p, q)) continuously receives the current position value of the host vehicle and the value exists in the boundary (REC (p, q)). If you cross the boundary (REC (p, q)) without changing the numeric screen, the new numerical map is searched. When the setting of the boundary surface REC (p, q) is completed in this way, in step S20, the numerical map is searched based on the coordinate values obtained in the maximum surface setting process, and then the linear function F (f) is used. The coordinate values of the searched numerical map are converted into coordinate values of the screen of the display unit 7 and displayed. In this way, after displaying the numerical map centering on the initial position of the host vehicle on the screen of the display unit 7, the flow advances to step S22 to set a flag (i) indicating whether the initial position is set. Collect the current location point. In step S14, it is determined whether the current position of the host vehicle exists in the set boundary REC (p, q). In step S24, when the current position of the host vehicle exists within the set boundary surface REC (p, q), the driving trajectory of the host vehicle is continuously displayed on the currently displayed map screen. On the other hand, when the current position P of the host vehicle exists within the set boundary surface REC (p, q), the driving trajectory of the host vehicle is continuously displayed on the currently displayed map screen. On the other hand, when the current position P of the host vehicle is outside the set boundary surface, steps S16 and S18 are sequentially performed to reset the maximum surface REC (a, b) and the boundary surface REC (p, q). In step S20, the map screen is updated and displayed based on the maximum surface REC (p, q) set as described above.

According to the numerical map scrolling method of the vehicular navigation system of the present invention as described above, the driver automatically scrolls the map screen so that the current position of the vehicle is always located at the center of the indicator screen. The inconvenience of having to manually operate manually is eliminated.

Claims (1)

In a vehicle navigation system which collects coordinate values of the current position point of the own vehicle, matches it to the numerical map data, and displays it on the display screen, (A) based on the reference point based on the collected current position point of the own vehicle A maximum plane setting step of determining a rectangular plane of an area corresponding to the screen of the indicator and obtaining an absolute coordinate value corresponding to the center point of the corner and side of the determined rectangular plane; (B) setting a boundary surface of a predetermined size within the set maximum surface; (C) searching for and displaying a numerical map included in the set maximum surface and displaying the same on a display screen; (D) displaying the current position of the own vehicle on the floated numerical map when the current position of the own vehicle on the floated numerical map exists within the set boundary; (E) repeating the steps (a) to (c) if the current position of the host vehicle is outside the set boundary, and repeating the steps (a) to (c).