EP0123562B1
Expired / Lapsed
EP
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Vehicule route finding system
Assignee: British Telecommunications PLC
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Filing: 1984-04-26
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Granted: 1990-07-18
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Expires: 2004-04-26
Abstract
Abstract A vehicle route finding system whereby a vehicle borne receiver (10) picks up signals from a radio navigation system (14, 15, 16, 23), such as the Loran-C system, and transmits data related to its location to a central station, via the data channel on a radiotelephone link. At the central station a computer (16) determines the vehicle's position from the Loran data and, knowing its desired destination, retransmits routing information back to the driver. True position values additionally transmitted from the vehicle are used to compensate for propagation errors.
Inventors
- 👤 Charles Joseph Hughes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/09; G08G1/0962; G08G1/0968; G08G1/096805; G08G1/096811; G01; G01C; G01C21/00; G01C21/26; G01S; G01S5/00; G01S5/0009; G08G1/096855; G08G1/096872
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
255 words
A vehicle route-finding system comprising: -a base station (14, 15, 16, 23) having a computer (16) linked with first communication means (14, 15); -a plurality of vehicle-borne mobile stations (10-13,17-21), each of which has a receiver (10) for receiving signals from a radio navigation system and for deriving from the received signals information relating to the location of that vehicle, and second communication means (12, 13) for communicating with the first communication means so as to provide the location-related information to the computer (16); the computer being arranged to calculate, on the basis of known position data of known locations and the location-related information derived for these locations, correction data for correcting the location-related information for errors caused by radio propagation irregularities, characterised in that: ―each second communication means (12, 13) is arranged to transmit to the base station, upon command from the driver of the corresponding vehicle, information defining a desired destination having known position data and a signal indicating to the computer the arrival of the vehicle at the desired destination; -the computer (16) is arranged to calculate the correction data in response to the arrival-indicating signals, from the position data of the destination reached and the associated location-related information, to apply the calculated correction data to subsequently received location-related information, and to update the correction data when arrival of a vehicle at a destination, which is a known location, is signalled to the computer; and -the first communication means (14, 15) is arranged to transmit vehicle routing information generated by the computer.
Claim 2
Dependent Claim
255 words
A vehicle route-finding system comprising: -a base station (14, 15, 16, 23) having a computer (16) linked with first communication means (14, 15); -a plurality of vehicle-borne mobile stations (10-13,17-21), each of which has a receiver (10) for receiving signals from a radio navigation system and for deriving from the received signals information relating to the location of that vehicle, and second communication means (12, 13) for communicating with the first communication means so as to provide the location-related information to the computer (16); the computer being arranged to calculate, on the basis of known position data of known locations and the location-related information derived for these locations, correction data for correcting the location-related information for errors caused by radio propagation irregularities, characterised in that: ―each second communication means (12, 13) is arranged to transmit to the base station, upon command from the driver of the corresponding vehicle, information defining a desired destination having known position data and a signal indicating to the computer the arrival of the vehicle at the desired destination; -the computer (16) is arranged to calculate the correction data in response to the arrival-indicating signals, from the position data of the destination reached and the associated location-related information, to apply the calculated correction data to subsequently received location-related information, and to update the correction data when arrival of a vehicle at a destination, which is a known location, is signalled to the computer; and -the first communication means (14, 15) is arranged to transmit vehicle routing information generated by the computer.
Claim 3
Dependent Claim
36 words
A system as claimed in claim 1, wherein the communication means of each mobile station includes a mobile radio communications trans- mitter/receiver (12, 13), and wherein the computer (16) is situated at a fixed central location.
Claim 4
Dependent Claim
25 words
A system as claimed in claim 1 or claim 2, wherein the communication means (12, 13) of each mobile station comprises cellular radio communication means.
Claim 5
Independent Claim
36 words
A system as claimed in any of claims 1 to 3, wherein each mobile unit is provided with a speech synthesizer device, whereby the routing information can be communicated to the driver of the associated vehicle.
Claim 6
Independent Claim
33 words
A system as claimed in any one of claims 1 to 4, wherein each mobile station is provided with a vehicle motion monitoring device (19), whose output is communicated to the computer (16).
Claim 7
Dependent Claim
15 words
A system as claimed in claim 5, wherein each motion monitoring device is an accelerometer.
Claim 8
Dependent Claim
15 words
A system as claimed in claim 5, wherein each motion monitoring device is an odometer.
References Cited (Backward Citations)
No citation records indexed.
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