EP0243635A2 - Strassenleitsystem - Google Patents
Strassenleitsystem Download PDFInfo
- Publication number
- EP0243635A2 EP0243635A2 EP87103562A EP87103562A EP0243635A2 EP 0243635 A2 EP0243635 A2 EP 0243635A2 EP 87103562 A EP87103562 A EP 87103562A EP 87103562 A EP87103562 A EP 87103562A EP 0243635 A2 EP0243635 A2 EP 0243635A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- data
- level
- vehicle
- signal
- roadside
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
- G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
- G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
- G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
- G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
- G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
- G08G1/096758—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where no selection takes place on the transmitted or the received information
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
- G08G1/096805—Systems involving transmission of navigation instructions to the vehicle where the transmitted instructions are used to compute a route
- G08G1/096827—Systems involving transmission of navigation instructions to the vehicle where the transmitted instructions are used to compute a route where the route is computed onboard
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
- G08G1/096855—Systems involving transmission of navigation instructions to the vehicle where the output is provided in a suitable form to the driver
- G08G1/096861—Systems involving transmission of navigation instructions to the vehicle where the output is provided in a suitable form to the driver where the immediate route instructions are output to the driver, e.g. arrow signs for next turn
Definitions
- This invention relates generally to a roadside beacon system. More particularly, this invention relates to a roadside beacon system which is used to calibrate the position of a vehicle and to perform data transmission in a navigation system in which, after data on a departure point are inputted, vehicle speed data and direction data are inputted to enable the display of the present position of the vehicle.
- a so-called "navigation system” for vehicles has been known in the art.
- a small computer and a small display unit are installed on a vehicle.
- a road map is read out of memory means such as a compact disk and displayed on the display unit.
- the vehicle speed data outputted by a vehicle speed sensor and the direction data provided by a direction sensor are inputted, so that calculation of the position of the vehicle and determination of the traveling direction of the vehicle are performed at all times. According to the results of the calculation and the determination, the vehicle is marked on the road map displayed on the display unit.
- the operator in the vehicle can visually detect the present position and the traveling direction of his vehicle. Therefore, he can reach his destination without losing his way.
- the navigation system described above is disadvantageous in the following point.
- the errors inherent in the vehicle speed sensor and the direction sensor are accumulated as the vehicle runs.
- a predetermined value which is not always constant, being determined by the errors of the vehicle speed sensor and the direction sensor of each vehicle and by the environmental conditions of the positions where the sensors are installed
- the position of the vehicle displayed on the display unit is greatly shifted from the true position. That is, the system becomes unreliable and the vehicle operator may lose his way.
- roadside antennas are installed at intervals shorter than the distance with which the error accumulated exceeds the above-described predetermined value.
- the roadside antennas are used to transmit signals including position data and road direction data to predetermined relatively small areas, respectively.
- the signals thus transmitted are received through the antenna installed on a vehicle so that the position and the traveling direction of the vehicle are calibrated with a computer.
- the error accumulated is smaller than the predetermined value so that the position of the vehicle can be displayed according to the correct position data and the accurate direction data at all times.
- roadside antennas considerably high in directivity are used to transmit the aforementioned signals including position data and road direction data at all times.
- the vehicles receive the signals only when passing through the areas converted by the signals and the calibration is carried out according to the signals thus received. Therefore, if the area covered by the signal thus transmitted through each roadside antenna is increased, then the signal receiving position of the vehicle with respect to the roadside antenna is greatly shifted. As a result, the position and the traveling direction of the vehicle cannot be effectively calibrated.
- the roadside beacon system is provided primarily for transmitting signals including position data and road direction data to vehicles having navigation systems. However, it is desirable to give the following functions to the system for more effective utilization:
- an object of this invention is to provide a roadside beacon system in which a variety of function can be readily performed and calibration of a vehicle position can ⁇ be achieved with high accuracy.
- a navigator device is installed on a vehicle and is adapted to receive signals transmitted through each of several roadside antennas to calibrate and display vehicle position data.
- the navigator device includes data receiving means for receiving a transmitted signal when the level of the transmitted signal is higher than a relatively low level.
- Position determining means receive a transmitted signal when the level of the transmitted signal is higher than a relatively high level in order to output a position determination signal.
- Calibrating means calibrates position data based on data representing positions of antennas, for instance, which has been stored in navigator devices and direction data according to the position determination signal and data received.
- the relatively low level should be set to a value with which the signals transmitted through the roadside antennas can be received without being affected by noise or the like.
- the relatively high level should be set to a value which is close to the peak value in level of a signal received by the navigator device when the vehicle confronts the roadside antenna.
- a variety of data including a variety of data are transmitted to the vehicles through the roadside antennas installed along roads at predetermined positions.
- the signal whose level is higher than the relatively low level can be received by the data receiving means and the signal whose level is higher than the relatively high level can be received by the position determining means thus providing the position determination signal.
- the calibrating means receiving the data received by the data receiving means and the position determination signal outputted by the position determining means, calibrates the position data and the direction data. Then, navigation of the vehicle is continued by using the output signals of a vehicle speed sensor and a direction sensor.
- the relatively low level is set to the value with which the signals transmitted through the roadside antennas can be received without being affected by noise or the like. Then, the navigation system on the vehicle can receive signals including data necessary for additional functions as well as the position data and the road direction data which are absolutely required for the original position finding function.
- the relatively high level is set to the value which is close to the peak level value of the signal received by the navigator device when the vehicle confronts anyone of the roadside antennas.
- the position data and the road direction data can be calibrated when the vehicle has approached the roadside antenna.
- the data transmitted for a relatively long period of time which is determined by the relatively low level are applied to the communication data terminal, necessary communication data can be read with means connected to the communication data terminal.
- Fig. 5 is a diagram showing one example of a road map displayed on a display unit.
- the present position and traveling direction of the vehicle is indicated by the arrow A.
- the positions of roadside antennas P i , P 2 ,... and P n are also indicated (the indication of these roadside antennas not always being required).
- buildings or the like which can be used a guides are indicated.
- Figs. 3 and 4 are schematic diagrams for a description of the road-side beacon system according to the invention.
- a roadside antenna 2 is installed at a predetermined position near a road 1.
- the roadside antenna 2 is connected to a navigation data transmitter 2a to transmit a signal including position data and road direction data.
- a mobile antenna 4 for receiving the aforementioned signal is installed at a predetermined position on a vehicle 3 which runs along the road 1.
- the signal received by the mobile antenna 4 is supplied to a navigation device (not shown in Figs. 3 and 4).
- the roadside antenna 2 is so high in directivity that it covers only a relatively small area R in Fig. 4.
- the roadside antenna 2 is such that it is nondirectional for instance in a horizontal direction.
- Fig. 1 is a block diagram showing one example of the roadside beacon system according to the invention.
- the signal passed through the gate circuit 8 is temporarily stored in a memory 9.
- necessary communication data are read out by a CRT display device lla connected to a communication data terminal 11.
- data such as road direction data and map data are transferred into a navigation device.
- the present position data is applied to a navigator 10 in response to a position determining signal (or timing pulse signal) outputted by the high level determining circuit 6, so that the present position is calibrated.
- the determining reference levels of the level determining circuits 6 and 7 are set, to Li and L 2 (L 1 >L 2 ) respectively.
- the level of as signal received by the mobile antenna 4 is substantially zero (0). Therefore, signals whose levels are lower than the determining reference levels L l and L 2 are applied to both the level determining circuits 6 and 7. Therefore, the gate circuit 8 is maintained closed and no data is transferred to the memory 9, e.g., during the period T i in Fig. 2.
- the level of the signal received by the antenna 4 gradually increases. However, the above-described operation is continued until the level of the signal applied to the low level determining circuit 7 becomes higher than the determining reference level L 2 , (e.g., during the period T 2 in Fig. 2).
- the navigator 10 calculates and determines the present direction and the traveling direction of the vehicle according to the vehicle speed data outputted by a vehicle speed sensor (not shown) and the traveling direction data provided by a direction sensor (not shown), so that the present position and traveling direction of the vehicle together with the road map are displayed on the display unit (not shown).
- the level of the signal received by the antenna becomes higher.
- the gate circuit 8 is opened by the data-transmitting-area determination signal outputted by the low level determining circuit 7.
- the signal received by the mobile antenna 4 and amplified by the amplifier 5 is stored in the memory 9, (e.g., during the period T3 in Fig. 2) and predetermined data are applied to the communication data terminal 11 and the necessary data are inputted into the navigator 10.
- the level of the signal received by the mobile antenna 4 is further increased and the level of the signal supplied to the high level determining circuit 6 exceeds the high reference level L l so that the high level determining circuit 6 outputs a position determination signal which is applied to the navigator 10.
- the position data is transferred to the navigator 10, so the present position stored in the navigator 10 is calibrated.
- the position data and the traveling direction data have been calibrated. That is, the correct present position and traveling direction can be displayed on the display unit.
- the position and the traveling direction of the vehicle 3 can be displayed as a function of time with the arrow A on the display unit lla together with the road map using the vehicle speed data outputted by the vehicle speed sensor and the traveling direction data provided by the direction sensor.
- Fig. 2 shows the variation in level of the signal received by the vehicle 3 which runs at a con g tant speed.
- the periods T 1 , T 2 and T 3 are merely varied, shortened or lengthened, according to the speeds, which will not change the effect of the invention.
- the necessary data are stored in the memory 9 temporarily, and the predetermined data are store in the navigator 10. Only when the vehicle has sufficiently approached the roadside antenna 2 is the position data transferred to the navigator 10 so that the present position and the traveling direction of the vehicle are calibrated. Therefore, even if the number of pieces of data transmitted through the roadside antenna 2 increases, the data can be positively written in the navigator 10. Therefore, the system can perform a variety of functions (such as displaying road conditions and traffic congestion). Furthermore, other necessary communication data can be transmitted to the communication data terminal 11. Since the position detection of the vehicle 3 is carried out when the vehicle comes sufficiently close to the roadside antenna 2 and the received signal level reaches the peak value, the position of the vehicle 3 can be detected with high accuracy.
- the threshold level for storing data transmitted through the roadside antenna is set at a low level and the treshould level for detecting the position of the vehicle is set to a high level with the result that the position detection is carried out with high accuracy and the number of pieces of data transmitted can be increased.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Traffic Control Systems (AREA)
- Navigation (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57369/86 | 1986-03-14 | ||
JP5736986A JPS62212897A (ja) | 1986-03-14 | 1986-03-14 | ナビゲータ装置 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0243635A2 true EP0243635A2 (de) | 1987-11-04 |
EP0243635A3 EP0243635A3 (en) | 1989-04-26 |
EP0243635B1 EP0243635B1 (de) | 1993-01-13 |
Family
ID=13053673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870103562 Expired - Lifetime EP0243635B1 (de) | 1986-03-14 | 1987-03-12 | Strassenleitsystem |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0243635B1 (de) |
JP (1) | JPS62212897A (de) |
CA (1) | CA1277014C (de) |
DE (1) | DE3783504T2 (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1531441A2 (de) * | 2003-11-12 | 2005-05-18 | Samsung Electronics Co., Ltd. | Navigationssystem mittels einer Zentrale und Kalibrierungsmethode für während der Benutzung entstehende Fehler |
US8554463B2 (en) | 2006-03-31 | 2013-10-08 | Volkswagen Ag | Navigation system for a motor vehicle |
US8700308B2 (en) | 2006-03-31 | 2014-04-15 | Volkswagen Ag | Navigation system for a motor vehicle |
US9052214B2 (en) | 2006-05-22 | 2015-06-09 | Volkswagen Ag | Navigation system for a motor vehicle, method for operating a navigation system and motor vehicle including a navigation system |
US9478133B2 (en) | 2006-03-31 | 2016-10-25 | Volkswagen Ag | Motor vehicle and navigation arrangement for a motor vehicle |
US9846051B2 (en) | 2006-03-31 | 2017-12-19 | Volkswagen Ag | Navigation system for a motor vehicle |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2025185A (en) * | 1978-07-05 | 1980-01-16 | Siemens Ag | Vehicle location system |
EP0021060A1 (de) * | 1979-06-11 | 1981-01-07 | Siemens Aktiengesellschaft | Leitsystem für den Individualverkehr |
GB2059721A (en) * | 1979-03-26 | 1981-04-23 | Nissan Motor | Communications systems for automotive vehicles |
-
1986
- 1986-03-14 JP JP5736986A patent/JPS62212897A/ja active Granted
-
1987
- 1987-03-12 DE DE19873783504 patent/DE3783504T2/de not_active Expired - Fee Related
- 1987-03-12 EP EP19870103562 patent/EP0243635B1/de not_active Expired - Lifetime
- 1987-03-13 CA CA000532059A patent/CA1277014C/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2025185A (en) * | 1978-07-05 | 1980-01-16 | Siemens Ag | Vehicle location system |
GB2059721A (en) * | 1979-03-26 | 1981-04-23 | Nissan Motor | Communications systems for automotive vehicles |
EP0021060A1 (de) * | 1979-06-11 | 1981-01-07 | Siemens Aktiengesellschaft | Leitsystem für den Individualverkehr |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1531441A2 (de) * | 2003-11-12 | 2005-05-18 | Samsung Electronics Co., Ltd. | Navigationssystem mittels einer Zentrale und Kalibrierungsmethode für während der Benutzung entstehende Fehler |
EP1531441A3 (de) * | 2003-11-12 | 2006-06-28 | Samsung Electronics Co., Ltd. | Navigationssystem mittels einer Zentrale und Kalibrierungsmethode für während der Benutzung entstehende Fehler |
US8554463B2 (en) | 2006-03-31 | 2013-10-08 | Volkswagen Ag | Navigation system for a motor vehicle |
US8700308B2 (en) | 2006-03-31 | 2014-04-15 | Volkswagen Ag | Navigation system for a motor vehicle |
US9478133B2 (en) | 2006-03-31 | 2016-10-25 | Volkswagen Ag | Motor vehicle and navigation arrangement for a motor vehicle |
US9846051B2 (en) | 2006-03-31 | 2017-12-19 | Volkswagen Ag | Navigation system for a motor vehicle |
US9052214B2 (en) | 2006-05-22 | 2015-06-09 | Volkswagen Ag | Navigation system for a motor vehicle, method for operating a navigation system and motor vehicle including a navigation system |
Also Published As
Publication number | Publication date |
---|---|
EP0243635B1 (de) | 1993-01-13 |
JPH0580717B2 (de) | 1993-11-10 |
EP0243635A3 (en) | 1989-04-26 |
JPS62212897A (ja) | 1987-09-18 |
DE3783504T2 (de) | 1993-05-13 |
DE3783504D1 (de) | 1993-02-25 |
CA1277014C (en) | 1990-11-27 |
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