KR200323071Y1 - Image display of Car Location including altitude using Map - Google Patents

Abstract

The present invention relates to an image information display apparatus for detecting a vehicle position in relation to the position of a vehicle while driving and applying an altitude on a map. In particular, the vehicle position image information display capable of displaying a vehicle position composed of longitude and latitude with high accuracy. Relates to a device.

More specifically, the map data of the map information storage unit 12 includes altitude information for each node constituting the road, and the microcomputer 16a of the GPS receiver 16 corresponds to the vehicle position formed by the longitude and latitude detected earlier. To generate the altitude information from the map information storage unit 12 via the map information processing means 11, and at the same time, a horizontal two-dimensional position accuracy deterioration rate (HDOP) value or two horizontal directions among three GPS satellites that can be observed in a vehicle. Select the combination of two-dimensional positioning GPS satellites with the smallest HTDOP value of dimensional position and time, and use the input altitude information and each selected GPS satellite to determine the current position from the longitude and latitude according to the two-dimensional positioning method. Calculate and detect the vehicle's position.

Description

Image information display device for vehicle location applying altitude on the map {Image display of Car Location including altitude using Map}

The present invention relates to an image information display device for vehicle position, and to detect a vehicle position composed of longitude and latitude by applying a triangulation principle using a satellite positioning system (GPS). An information display apparatus.

The current position of the vehicle is detected, map data around the current position is read from recording means such as a CD-ROM, and the vehicle position mark is displayed on each map image based on each map information, and the vehicle position mark is displayed on each map image. In addition, the image information display apparatus for a vehicle position for providing information so that the driver can easily navigate to the desired destination by scrolling the map by moving the vehicle location mark as the vehicle moves.

The map data includes (1) a road layer consisting of a node list, a road list, and an intersection node list, (2) a background layer for displaying roads, rivers, buildings, etc. on a map, and (3) an area name for displaying a city. The map image, which is composed of a text layer and the like, is displayed based on the background layer or the text layer, and the map matching process or the search process of the guidance path is calculated using the road layer.

The detection means of the vehicle position detection device mounted on the vehicle uses a distance sensor and an orientation sensor, a dead reckoning for calculating a position change amount per unit driving distance, and a satellite navigation for calculating a position using a triangulation principle using a predetermined satellite. There is this. The dead reckoning can detect the vehicle position at a relatively low cost, but there is a drawback of accumulating sensor errors when the traveling distance is long, and a correction process such as map matching is required. On the other hand, satellite navigation has been spotlighted as a vehicle position detecting means that does not have the above drawbacks and requires high precision.

The Global Positioning System (GPS) is a global positioning system that uses satellites developed and developed by the US Department of Defense to find the current position. Currently, more than 24 GPS satellites have been launched above the Earth, and it is always possible to receive radio waves from 4 or more satellites anywhere in the world. Each satellite is clearly orbited and can be located at any time.

In GPS, a plurality of satellites are projected on each of a plurality of orbits around the earth, and each satellite transmits a spectrum message (C / A code) with a navigation message (orbit information, time information, etc.) and a different PRN code (C / A code). . The satellite signals from each of these satellites are mounted on a vehicle and received by a GPS receiver of a device that detects the vehicle position and despread to demodulate the PRN code and the navigation message. Each satellite has a built-in atomic clock synchronized with each other, and the PRN code indicates the transmission time of the satellite. The GPS receiver measures the time it takes to reach the satellite signal from each satellite to the vehicle using a built-in clock from the code and performs a predetermined correction process using navigation messages. Calculate Since the position of each satellite can be calculated from the navigation message, the vehicle position is detected using the triangulation principle using the satellite position data and the distance data between the satellite and the vehicle. GPS is a system based on three-dimensional positioning (longitude, latitude, altitude). When the latitude is below zero, such as sea, two-dimensional positioning can measure the hardness and latitude.

As described above, the GPS receiver is capable of three-dimensional measurement and two-dimensional measurement, but the GPS receiver used in the conventional vehicle position detecting apparatus uses four GPS satellites because it contains many unknown unknowns. Longitude, latitude, and altitude are calculated by three-dimensional measurement, and the longitude and latitude data are used as detection data of the vehicle position.

However, if GPS can be observed at the observation point, it is not possible to combine any four satellites to make high-level three-dimensional measurements, and the precision varies greatly depending on the combined satellite arrangement. In the case of two-dimensional measurement, there is a difference in precision according to the three satellite arrangements combined as well. For this reason, GPS calculates a value indicating a precision drop rate (DOP) due to satellite arrangement, and measures a combination satellite whose minimum DOP value is the minimum. In three-dimensional measurement, select a satellite arrangement that minimizes the three-dimensional position precision deterioration rate (PDOP) or the three-dimensional position and visual accuracy deterioration rate (GDOP) .In two-dimensional measurement, the horizontal two-dimensional position precision deterioration rate (HDOP) value or horizontal Select a satellite arrangement where the direction two-dimensional position and the value of time of precision deterioration rate (HTDOP) are minimum. Since the calculation method of these various precision fall rate values is a well-known technique, description is abbreviate | omitted. As described above, GPS has a problem in that the positional accuracy in the height direction has a certain limit in the detection accuracy in the horizontal direction such as longitude and latitude.

Therefore, the technical problem to be achieved by the present invention is to solve the problems of the prior art described above, vehicle location from a combination of altitude information and two-dimensional positioning satellite corresponding to the vehicle location including the longitude and latitude from the map information The present invention provides an image information display apparatus capable of accurately displaying position information (longitude and latitude) of a vehicle to which altitude on a map is applied by measuring the position in two dimensions.

1 is an embodiment of the present invention, the position-related image information display device of the vehicle to which the altitude is applied.

2 is a block diagram showing a road layer on the map data of the present invention.

(Code description for main parts of drawing)

11: map information processing means 12: map information storage means

13 operation part 14 display part

15 antenna 16: GPS receiver

16a: frequency converter 16b: demodulator

16c: microcomputer 16c1: position calculation means

16c2: satellite selection means 16c3: altitude information generating means

In order to achieve the above technical problem, according to an aspect of the present invention (1) using a satellite selection means for selecting a combination of satellites that are optimal for vehicle position detection among the GPS satellites observable from the vehicle and (2) using each selected satellite (3) The altitude on the map is provided with a position calculating means for calculating a vehicle position in longitude and latitude according to a predetermined position measuring method, and (3) an altitude information generating means for generating altitude information corresponding to the vehicle position in longitude and latitude. An applied vehicle position related image information display apparatus is provided.

The satellite selecting means selects a horizontal two-dimensional position precision deterioration rate (HDOP) value or a combination of a horizontal two-dimensional position and a two-dimensional positioning satellite having the smallest precision deterioration rate (HTDOP) value in time. The means inputs the altitude information corresponding to the vehicle position of the longitude and latitude detected previously from the altitude information generating means, and uses the GPS satellite selected by the altitude information and the satellite selection means to locate the current vehicle according to the two-dimensional positioning result. Will be calculated. Compared with the conventional three-dimensional positioning, it is possible to detect the vehicle position by using the high-precision longitude and latitude information.

According to another aspect of the present invention, the altitude information generating means has storage means for storing altitude information for each two-dimensional position including longitude and latitude information in advance.

3D positioning precision GPS (POP) or 3D positioning GPS (GDOP) minimum combination of GPS satellites, even when the vehicle position cannot be measured for a certain period of time. At the same time, the vehicle position is calculated according to the three-dimensional measurement result using each selected satellite, and the vehicle position is calculated according to the two-dimensional position by using the altitude information corresponding to each vehicle position.

Accordingly, even if the position measurement by the GPS satellites is impossible for a certain time, the vehicle position can be detected, so that accurate two-dimensional position measurement can be started using accurate altitude information on the vehicle position. In addition, when vehicle position data such as latitude and longitude are input, the altitude information generating means reads altitude information corresponding to the vehicle position from the storage means and outputs it to the position calculating means. Accordingly, even with a relatively simple configuration, high-precision altitude information on the vehicle position can be used.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the configuration and operation of the present invention.

Referring to FIG. 1, the present invention includes a map information processing means 11, a map information storage part 12, an input means 13, a GPS receiver 16, an antenna 15, and a display part 14.

The map information processing means 11 displays a map or a vehicle location mark according to the vehicle position as an image, and performs an optimum route search processing function.

The map information storage section 12 is a map information storage section that stores map data. Map information includes (1) a road layer consisting of a node list, a road list, a junction node list, etc., (2) a background layer for displaying roads, rivers, buildings, etc. on a map, and (3) an area name for displaying a city. It consists of a character layer.

The input means 13 may have various input keys (map search key, route search key, scroll key).

The display unit 14 is a means for displaying image information such as a map image, a vehicle position mark, an optimum path, and the like.

The antenna 15 is an antenna for receiving satellite waves from each satellite, and the GPS receiver 16 receives satellite signals and detects current position information of the vehicle such as longitude and latitude, and the receiver amplifies and converts the frequency 16a. ), A demodulator 16b and a microcomputer 16c.

The frequency amplification and conversion means 16a performs frequency amplification and frequency conversion of the satellite signal, and the demodulation unit 16b despreads as a predetermined despread code that is different for each satellite, and the C / A code, P code, and navigation message Demodulation of various data such as orbit information, time information, and the like is performed.

The microcomputer 16c uses (1) satellite selection means 16c2 for selecting a combination of satellites optimal for vehicle position detection among GPS satellites observable from the vehicle, and (2) a predetermined position measuring method using each selected satellite. According to the position calculation means 16c1 and (3) the map information processing means 11 for calculating the vehicle position in longitude and latitude, and receiving the map data from the map information storage unit 12. And altitude information generating means 16c3 for generating altitude information corresponding to the position.

2 shows a road layer including altitude information stored in the map data storage 12.

The road list RLDT includes data such as the total number of nodes on the road by road, the number on the node list NDLT of the nodes constituting the road, the type of road (national road, highway, local road, etc.) and the road number (road name). In addition, the intersection list node list CRLT is a set of numbers on the node list NDLT of the other node (called an intersection node) that forms an intersection and link at each intersection point on the map, and the node list NDLT is a list of underlay nodes constituting the road. Location information (longitude, latitude) for each node, the intersection identification flag for each node's presence or absence, the elevation (elevation) of each node, if the node has an intersection, the location of the corresponding intersection configuration node list CRLT. If not, it consists of a pointer to the location on the road list RDLT to which each node belongs.

In the above embodiment, altitude information is stored for each node in the road layer in the map data storage unit 12, and altitude information detected by the receiver is read out and transmitted to the receiver. Alternatively, an air pressure sensor is installed in the vehicle. There is also a method of storing a table in which a relationship between barometric pressure and altitude is stored in a predetermined memory, and when there is a request for altitude information from the receiver, the altitude corresponding to the barometric pressure sensor output is read from the table and output to the GPS receiver. .

So far I looked at the center of the preferred embodiment (s) for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the utility model registration claims rather than the foregoing description, and all differences within the equivalent scope should be interpreted as being included in the present invention.

As described above, according to the present invention, the vehicle position can be measured in two dimensions by combining optimal satellites using accurate altitude information on the current position of the vehicle, and thus the position information of the vehicle is compared with the conventional three-dimensional position measurement ( Longitude, latitude) can be detected accurately.

In addition, even when the vehicle position has not been calculated for a certain period of time, the two-dimensional position measurement using the altitude information of the vehicle position can be resumed by detecting the vehicle position with high accuracy through the combination of the three-dimensional positioning satellites. When the vehicle position information is inputted, the altitude information generating means reads altitude information corresponding to the vehicle position from the storage means and outputs the position information to the position calculating means. have

Claims (2)

It is mounted on the vehicle and receives satellite signals to detect the current location information of the vehicle such as longitude and latitude, and displays the map or vehicle location mark according to the vehicle location as an image, and the image information about the location of the vehicle searching for the optimum route. In the display device, Altitude information generating means 16c3 for generating altitude information corresponding to the vehicle position consisting of longitude and latitude, and a horizontal two-dimensional position precision deterioration rate (HDOP) value or a horizontal two-dimensional position and time-depreciation rate (HTDOP) value The current vehicle position is calculated using the two-dimensional position measurement value from the satellite selection means 16c2 which selects the least two-dimensional GPS satellite combination and the GPS satellite selected by the altitude information and the satellite selection means. And a position calculating means (16c1). 2. The vehicle position related image information to which the altitude on the map is applied according to claim 1, characterized in that the altitude information generating means (16c3) includes storage means for storing altitude and latitude information in advance for each two-dimensional position. Display.