JPH11201765A - Correcting device and its method for display location of navigation system and storage medium therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a navigation system capable of accurately displaying the position of a mobile on a map by receiving the installation position informa tion of the antenna of the telephone base station of an existing portable tele phone or a simplified portable telephone (PHS), and correcting the position data obtained from the GPS signal, based on the information. SOLUTION: A mobile receives the position information 1a from a GPS satellite, the received position information 1a is superimposed on the map information stored on a storage medium 3 such as a CD-ROM, and the present position of the moving body is display on a display device 7 in this navigation system. The position data 1b of the antenna of a telephone base station is detected against the position data 1a from the GPS satellite, and the display position of the mobile is corrected and displayed, based on the data 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for correcting a display position of a navigation system and a recording medium for the apparatus, and more particularly to an antenna for a telephone base station of a portable telephone or a simplified portable telephone (PHS). The present invention relates to a display position correction method and apparatus for a navigation system that corrects the display position of a moving object based on the installation position data of the navigation system and enables the position of the moving object to be displayed accurately.

[0002]

2. Description of the Related Art Conventionally, a GPS (Globa) for a vehicle has been used.
l Positioning System) receives a position information from a GPS satellite, corrects the position information from the GPS satellite using a vehicle speed sensor or an acceleration sensor, and performs CD-RO.
The position of the vehicle is displayed on a map obtained from the map data stored in M.

However, even if such correction is made, a large error occurs because a GPS signal cannot be received in a tunnel or a valley of a building, and a signal detected by a sensor also includes an error, so that it is not corrected with high accuracy. In an area such as an urban area where there are many roads in a narrow range, the actual position and the display position are displayed differently, and therefore, correction is performed using other means.

FIG. 8 is a block diagram of an in-vehicle navigation system capable of performing such correction. 1 is a GPS receiver for receiving positional information from a GPS satellite, and 2 is stored in a CD-ROM 3. Map data, 4
Is a vehicle speed sensor for measuring the speed of the vehicle, 5 is an acceleration sensor for detecting the moving direction of the vehicle, 6 is a moving distance and an acceleration sensor obtained from a position data received by the GPS receiver 1 based on a signal from the vehicle speed sensor 4. An arithmetic unit for correcting and calculating the current position from the moving direction of the vehicle obtained from the signal from 5;
Is a display device for displaying the calculation result of the calculation device 6, 8 is an operation unit, 9 is a VIC for correcting the current position with higher accuracy.
This is an S decoder (a traffic information decoder).

The VICS decoder 9 receives a signal transmitted from an optical beacon transmitter installed on the road and corrects a display position (current position) based on map data in which the position of the optical beacon is recorded. is there. FIG. 9 is a flowchart showing the position correction of the above-described navigation system for mounting on a vehicle. After calculating the latitude, longitude and altitude from the GPS signal 1a (step F5), the vehicle speed (moving distance) is obtained from the output of the vehicle speed sensor 4. (Step F6), the direction of travel of the vehicle is obtained from the acceleration sensor 5 (step F7),
Further, based on the signal 1c from the VICS decoder 9, GP
The apparatus is configured to extract error correction data of the S signal, perform an operation for position correction (steps F8 and F9), and display the current position based on the data.

However, there is a disadvantage that correction cannot be performed on a road where no optical beacon transmitter is installed. As another correction method, a method is also known in which an FM multiplex receiver is provided, and a display position (current position) is corrected based on error data of a GPS signal included in FM multiplex broadcast radio waves.

However, according to the above-mentioned method, the FM broadcast station does not emit radio waves at midnight, for example, from 1:00 am to 5 am
There is a disadvantage that the time zone cannot be used.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the above-mentioned drawbacks of the prior art, and in particular, to install an antenna for a telephone base station of a portable telephone or a simplified portable telephone (PHS) which is an existing facility. A new navigation system display position correction method that receives position information and corrects position data obtained from a GPS signal based on this information, thereby enabling the position of a moving object to be accurately displayed on a map, and a method thereof. An apparatus is provided.

It is another object of the present invention to provide a recording medium for the above device.

[0010]

SUMMARY OF THE INVENTION The present invention basically employs the following technical configuration to achieve the above object. That is, in the first mode of the display position correcting device of the navigation system according to the present invention, the moving object receives position information from a GPS satellite, and the received position information is stored in a recording medium such as a CD-ROM. In a navigation system in which the current position of the mobile object is displayed on a display device, the position data of an antenna of a telephone base station is detected, and position data received from the GPS satellite is detected based on the detected data. And the display position of the moving body is corrected and displayed.
An aspect is characterized in that the position data of the antenna of the telephone base station is obtained based on an identification code of the telephone base station, and a third aspect is that the recording medium stores the data of the telephone base station. It is characterized in that it includes antenna position data, and the fourth aspect is characterized in that the position data includes at least latitude and longitude data of the antenna of the telephone base station, In a fifth aspect, the position data includes altitude data of an antenna of the telephone base station.
The aspect is that the mobile receives position information from a GPS satellite,
The received position information is superimposed on map information stored on a recording medium such as a CD-ROM or the like, and the current position of the moving object is displayed on a display device. In order to correct the display position of the moving object, a transmitting / receiving device for transmitting / receiving to / from a telephone base station near the moving object is provided, and the current position data of the moving object is obtained from the identification code of the telephone base station received by the transmitting / receiving device. Is detected, and the position data from the GPS satellite is corrected and displayed based on this data.

[0011] Further, in a mode of a method of correcting a display position of a navigation system according to the present invention, a moving object receives position information from a GPS satellite and transmits the received position information to a CD-ROM.
A method for correcting a display position of a navigation system in which a current position of the moving object is displayed on a display device by superimposing the map information on map information stored in a recording medium such as a ROM. A first step of calculating latitude, longitude, and altitude as the position data, a second step of receiving the identification code of the telephone base station, and detecting the second position data of the telephone base station from the received identification code. And a fourth step of correcting a display position of the first data with the second data.

A first aspect of a recording medium for a navigation system according to the present invention is a navigation system CD for displaying a current position of a moving object on a map.
-In a recording medium such as a ROM, the location data which is the installation position of the antenna of the telephone base station is included, and in the second aspect, the location data is at least the antenna of the telephone base station. The third aspect is characterized in that the position data includes altitude data of an installation position of an antenna of the telephone base station. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A display position correcting apparatus of a navigation system according to the present invention is described in which a mobile object receives position information from a GPS satellite, and stores the received position information in a CD-ROM.
In a navigation system that is superimposed on map information stored in a recording medium such as a display device and displays the current position of the moving object on a display device, the position data of the antenna of the telephone base station is detected, and based on this data, The GPS
It is characterized in that the display position of the mobile object is corrected and displayed based on the position data received from the satellite, and in this case, the position data of the antenna of the telephone base station may be a mobile phone or a simple phone. Since the current position is corrected and displayed based on the identification code of the telephone base station obtained at the time of negotiation with the telephone base station of the portable cellular phone, accurate current position data can be obtained without being charged.

In particular, in an urban area where accurate correction is required, the antennas of the telephone base station of the portable cellular phone are installed at narrow intervals, and the output radiated from the antenna is small (100 mW). The identification is also accurate and easy, and since the antenna is surrounded by a building, the antenna can be received only in a relatively narrow range (about 100 m from the antenna), so that extremely accurate position correction can be performed. .

[0015] In addition, the use time is not limited and can be used at all times. Further, since there is no need to provide new equipment, it can be implemented at low cost.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a specific example of a display position correcting device of a navigation system according to the present invention, FIG. 2 is a flowchart, and FIGS. 3 to 7 are diagrams for explaining the present invention. The mobile unit receives the position information 1a from the GPS satellite, superimposes the received position information 1a on the map information stored in the recording medium 3 such as a CD-ROM, and displays the mobile unit on the display device 7. 2
In a navigation system displaying the current position 21 of the telephone base station 0, the position data 1b of the antenna 22 of the telephone base station is detected, and the GPS data is detected based on the data 1b.
According to the position data 1a received from the satellite,
A display position correcting apparatus for a navigation system, wherein the display position of the mobile unit 20 is corrected and displayed, and a telephone near the mobile unit 20 is used to correct the current position of the mobile unit 20. A transmission / reception device 12 for transmitting / receiving to / from a base station is provided. The current position data of the mobile unit 20 is detected from the identification code of the telephone base station received by the transmission / reception device 12, and based on the data, the current position data from the GPS satellite A display position correcting device of a navigation system configured to correct and display the position data 1a is shown.

According to the present invention, the position of the display position of the navigation system is corrected using a mobile phone or a simplified mobile phone, or both, without making a call (without being charged). The position data such as the latitude, longitude and altitude of the mobile phone and the base station of the simplified mobile phone (hereinafter referred to as base station) and the height data of the antenna are stored in advance in a storage medium such as the CD-ROM 3 together with the map information. deep.

Then, the mobile station receives the ID (identification code) of the base station obtained at the time of negotiation of either the mobile phone or the simplified mobile phone, or both, and obtains the latitude / longitude data of the base station included in the map data. , And performs position correction using the latitude / longitude data calculated by the GPS reception signal. FIG. 1 is a block diagram of a navigation system according to the present invention, which includes a GPS receiver 1 for receiving a GPS signal, a vehicle speed sensor 4 for measuring a moving distance, an acceleration sensor 5 for measuring a moving direction,
A VICS decoder 9 for receiving traffic information;
An arithmetic unit 6 for performing a process for displaying the current position on the display device 7 based on the map data 2 from these signals, and a telephone base station of a mobile phone or a simplified mobile phone for improving the accuracy of the position information And a transmission / reception device 12 for receiving the ID. Note that the transmitting / receiving device 12 has a TD
MA signal processing unit 12a, digital modulation / demodulation unit 12b
, An RF processing unit 12c, and an antenna 12d.

Next, the operation of the navigation system of the present invention will be described. The navigation device of the present invention actively performs negotiation with the base station using the transceiver 12 for the mounted mobile phone or the simplified mobile phone, and receives the ID of the connectable base station. The negotiation here refers to a calling procedure described in Recommendation RCR STD-28 in the case of a simple type mobile phone. By performing the calling procedure, the navigation device of the present invention transmits a link channel establishment request to the nearest base station, and a link channel assignment notification is returned from the connectable base station. The returned data includes the base station ID (FIG. 3).

The map data 2 includes the latitude and longitude of the ID of the base station.
Use a recording medium to which longitude and altitude data are added in advance. Base station ID detected based on the above map data 2
Then, the latitude, longitude, and altitude of the base station 22 are extracted from, and a range where radio waves do not reach (is difficult to reach) (portion B in FIG. 7) is calculated.

Specifically, using the height data of the base station 22 and the height of the building, a three-dimensional map is first created as shown in FIG. Then, as shown in FIG. 7, a road that cannot be seen from the base station 22 is defined as a range B where radio waves cannot reach. At this time, if there is a building or a structure higher than the height of the base station, it is assumed that radio waves cannot reach other than the surface facing the base station. Also, when the base station is standing in a high place, it is assumed that buildings and structures enter between the base station and the road surface, and radio waves do not reach the shaded part.

The corrected current position 21 corresponds to the received G
The display position 25 based on the PS data and the base station 22 based on the received base station ID are connected by a straight line, and the current position 21 is displayed on a road 26 within the straight line. At this time, when a road is not included on the straight line L1, the current position is displayed on a road near the base station 22. Next, in order to further secure the display of the current position as the vehicle travels, a base station that will be selected in the next negotiation is predicted from the current position 21 (FIG. 4).

At this time, a base station 32 capable of transmitting a radio wave on a road in the traveling direction of the vehicle is extracted from the map data 2 by using a method of calculating a range where the radio wave does not reach (is difficult to reach) (FIG. 4). However, if the currently selected base station is in front of or at the side of the current position, the current base station is set as the base station selected in the next negotiation.

The traveling direction of the car is determined from the trajectory up to that time and the output of the acceleration sensor. The distance traveled by the vehicle is the difference from the previously received GPS signal (latitude / longitude difference, data updated every second in NMEA format from a normal GPS receiver) or a vehicle speed sensor (The output of the sensor is a pulse; the number of pulses transmitted in a certain time) is calculated.

Then, the base station 32 obtained by the above method is used.
If the base station 32 selected by negotiation is the same, a line L2 is drawn between the display position 35 displayed based on the GPS data (latitude / longitude) received again and the selected base station 32 (latitude / longitude). The current position 31 is displayed on the road 26 that matches the traveling direction of the car. of course,
The range where the radio wave calculated above does not reach is not set (FIG. 5).

If the result of the negotiation is different from the expected base station, assume that the GPS signal is correct, and predict again the base station that will be selected in the next negotiation. As described above, the ID number of the base station returned at the time of negotiation changes due to the movement of the vehicle. By comparing the movement state of the ID with the map data 2, the accuracy of the display position can be improved.

FIG. 2 is a flowchart for explaining the operation of the navigation system according to the present invention. The GPS signal 1a received by the VICS decoder 9 is transmitted to the error signal 1 received by the VICS decoder 9.
The display position of the GPS signal 1a is corrected by c, and the position is corrected by the correction method of the present invention, thereby displaying the display position with higher accuracy. In FIG. 2, first, as in FIG. 9, after calculating the latitude, longitude, and altitude from the GPS signal 1a (step F5), the vehicle speed (moving distance) is obtained from the output of the vehicle speed sensor 4 (step F6). The traveling direction of the vehicle is obtained from the acceleration sensor 5 (step F7), and further, error correction data of the GPS signal 1a is extracted based on the signal 1c from the VICS decoder 9, and calculation for position correction is performed (steps F8 and F).
9).

Subsequently, the ID signal 1b is received from the cellular phone or the simplified cellular phone base station (step F11), and the latitude and longitude are calculated based on the location data of the base station stored in the map data 2 (step F11). Step F12). And F9
Is compared with the latitude and longitude data calculated in step F12, and after confirming that these data are substantially equal and correct (step F13), the display position is corrected (step F15). , F16), F16
The current position is displayed based on the result of (Step F1)
8).

When it is not possible to connect to the predicted base station, a display is made based on the result of F9 (step F1).
7). Then, the deviation from the GPS signal is stored as error data and used as data for the next display (step F1).
0). As described above, in this specific example, the display position is corrected using many different data, and therefore, the accuracy of the display position is improved.

Although the above-described specific example has been described as a vehicle-mounted navigation system, it is a matter of course that the present invention may be applied to a portable navigation system.
In the above description, data recorded on a CD-ROM is used, but it is apparent that the object of the present invention can be achieved with other recording media.

[0031]

According to the present invention, the reach distance of radio waves from a simplified portable telephone base station is about 100 m in a straight line distance,
In a city center or the like, there is an increase in a range where radio waves cannot reach due to being blocked by the shadow of a building or the like. For the same reason, there is a possibility that a plurality of base station radio waves can be received at an intersection, so that there is no error per intersection. Therefore, the maximum error is 25 in the city center.
m, and the error is 1/4 to 1 /
It becomes 8.

If the base station of the portable cellular phone is installed in a suburban area so that there is no radio wave leakage, the error range is 5
0m, and the error is 1/2 to 1 compared to the conventional one.
/ 4. In addition, since it is not only a passive type but also an active type as in the related art, when it is desired to confirm the current position or to correct the position at an intersection or a suburban residential area, it has an excellent effect such that the position can be corrected quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram of a navigation system according to the present invention.

FIG. 2 is a flowchart illustrating the operation of the present invention.

FIG. 3 is a diagram for explaining a display method of the present invention.

FIG. 4 is a diagram for explaining a display method of the present invention.

FIG. 5 is a diagram for explaining a display method of the present invention.

FIG. 6 is a diagram for explaining a display method of the present invention.

FIG. 7 is a diagram for explaining a display method of the present invention.

FIG. 8 is a block diagram of a conventional technique.

FIG. 9 is a flowchart of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 GPS signal receiver 2 Map data 3 CD-ROM 4 Vehicle speed sensor 5 Acceleration sensor 6 Computing device 7 Display device 8 Operation part 9 VICS decoder 12 Transceiver device 21 Current position 22, 32 Base station 25, 35 Display position by GPS signal 26 road

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 27, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04Q 7/04 C

Claims (10)

[Claims] 1. A mobile unit receives position information from a GPS satellite, superimposes the received position information on map information stored in a recording medium such as a CD-ROM, and displays the current position of the mobile unit on a display device. In a navigation system for displaying a position, position data of an antenna of a telephone base station is detected, and based on this data, a display position of the mobile object is corrected and displayed based on position data received from the GPS satellite. A correction device for a display position of a navigation system, wherein the correction device is configured. 2. The apparatus according to claim 1, wherein the position data of the antenna of the telephone base station is obtained based on an identification code of the telephone base station. 3. The apparatus according to claim 1, wherein the recording medium includes position data of an antenna of the telephone base station. 4. The apparatus according to claim 3, wherein the position data includes at least latitude and longitude data of an antenna of the telephone base station. 5. The apparatus according to claim 4, wherein the position data includes altitude data of an antenna of the telephone base station. 6. A mobile unit receives position information from a GPS satellite, superimposes the received position information on map information stored on a recording medium such as a CD-ROM, and displays the current position of the mobile unit on a display device. In a display position correcting device for a navigation system adapted to display a position, a transmitting / receiving device for transmitting / receiving to / from a telephone base station near the moving object is provided for correcting the display position of the moving object. Wherein the current position data of the mobile object is detected from the identification code of the telephone base station received at step (a), and the position data received from the GPS satellite is corrected and displayed based on the data. How to correct the display position of the system. 7. A mobile unit receives position information from a GPS satellite, superimposes the received position information on map information stored in a recording medium such as a CD-ROM, and displays the current position of the mobile unit on a display device. What is claimed is: 1. A method for correcting a display position of a navigation system in which a position is displayed, comprising:
A first step of calculating longitude and altitude, a second step of receiving an identification code of the telephone base station, and a third step of detecting second position data of the telephone base station from the received identification code. And a fourth step of correcting a display position of the first data with the second data. 8. A recording medium such as a CD-ROM for a navigation system which displays the current position of a moving object on a map, wherein the recording medium includes position data indicating an installation position of an antenna of a telephone base station. Recording media for navigation systems. 9. The recording medium for a navigation system according to claim 8, wherein the position data includes at least latitude and longitude data of an antenna of the telephone base station. 10. The recording medium for a navigation system according to claim 8, wherein the position data includes altitude data of an installation position of an antenna of the telephone base station.