Communications: electrical – External condition vehicle-mounted indicator or alarm – Highway information
Patent
1996-10-09
1998-11-03
Hofsass, Jeffery A.
Communications: electrical
External condition vehicle-mounted indicator or alarm
Highway information
340903, 340904, 180169, 359152, 359169, 359170, G08G 109
Patent
active
058315519
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a system for acquiring traffic information in vehicles.
Such a system is known from DE-A-4138050 which essentially discloses an active transceiver for emitting an interrogation signal, in particular a radio-frequency interrogation signal, and for the reception and for the decoding of a reply signal. The interrogation signal is picked up by a passive transceiver, in which this signal is encoded. The encoded signal which is received by the active transceiver is decoded and utilized for identification purposes.
In the case of this known system, the active transceiver is located in a vehicle, while the passive transceiver is provided at predetermined points in traffic lanes. By means of interrogating the passive transceiver, information relating to the traffic can be interrogated. For instance, a traffic sign at the edge of the street can be provided with a passive transceiver which contains the information that there is a speed restriction of 60 km/h at a distance of 100 meters.
DE-A-4134601 discloses a method and devices for the transfer of information to the car driver. This information relates to the respective speed limitation and may contain additional communications about the state of the street and other potential dangers. The communication can be carried out both optically and acoustically and, depending on the hazard situation, may increase in intensity. The possibility of an intervention in the operation of the motor vehicle engine is also considered.
A system for transmitting information by means of infrared radiation using information data which is modulated on is known from DE-A-3248544. The transmission of information is carried out between stationary beacons and moving vehicles, each of which has a transmitter/receiver combination. The vehicle has at least two differently aligned transmitter/receiver combinations. At least two beacons fitted at different locations are provided, so that at least two differently aligned transmission paths are formed. The transmitters are connected in parallel and transmit the same data simultaneously. The receivers are connected in parallel on the output side and are configured in such a way that if interference signals lie above a predetermined interference signal threshold, the respective receiver is blocked.
DE-A-3319158 contains a description of a system for the transmission of information between an interrogation station and a reply station by means of optical radiation. An interrogation signal is emitted by the interrogation station and has applied to it a modulation, in part at a fixed frequency, in part with information code, and said signal is on the one hand received and evaluated by the reply station and on the other hand reflected back as reply signal and subjected to a modulation. The release of the back-reflection of the interrogation signal is in this case controlled as a function of the evaluation of an identifier contained in the interrogation signal. The instant of the release is controlled by means of an encoding contained in the interrogation signal, which encoding indicates the end of the transmitted message. Then, at the beginning of the back-reflection, a confirmation signal, for example an unchanged reflection of the encoding of the interrogation signal, is transmitted first. By means of this confirmation signal, the interrogation station is automatically controlled to a fixed frequency and/or fixed encoding. This produces the ready-to-reply state. In the reply station, means are provided for recognizing the fixed frequency or fixed encoding of the interrogation signal and for setting an operational readiness, tuned to this fixed clock, of the modulator of the reply station.
In the publication EP-B-0312524 a method is described for distance measurement between a transceiver for optical pulse signals and a target, by means of sending out optical pulse signals, the method being based on the principle of propagation time measurement. After the reflected signal has arrived at the tr
REFERENCES:
patent: 3892483 (1975-07-01), Saufferer
patent: 4325146 (1982-04-01), Lennington
patent: 5062088 (1991-10-01), Davidson et al.
patent: 5122796 (1992-06-01), Beggs et al.
Hofsass Jeffery A.
Leica Geosystems AG
Lieu Julie
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