Abstract: A method is described for detecting a rotating wheel of a vehicle that is travelling on a roadway in a travel direction, the wheels of which are at least partially exposed laterally, the method comprising: emitting an electromagnetic measurement beam having a known temporal progression of its frequency onto a first section above the roadway in a direction in a slant with respect to the vertical and normally or at a slant with respect to the travel direction; receiving a reflected measurement beam and recording the temporal progression of its frequencies, relative to the known progression, as a reception frequency mixture progression; and detecting a frequency band, which is continuously inclining or declining over a period of time, in the reception frequency mixture progression as a wheel. A device for conducting the method is also described.

Abstract: A method for authenticating an RFID tag with the aid of an RFID reader via a radio interface, wherein a user-specific key is stored in the RFID reader and a tag-specific identifier and a password generated from the identifier and the key in accordance with a known derivative function are stored in the RFID tag, comprising the following steps performed in the RFID reader: receiving via the radio interface the identifier of an RFID tag to be authenticated, generating the correct password from the received identifier and the stored key according to the known derivative function, and generating at least one incorrect password differing from the correct password, sending a series of at least two passwords, at least one being correct and at least one being incorrect, via the radio interface to the RFID tag, and authenticating the RFID tag if no confirmation response is received to any incorrect password.

Abstract: A method is disclosed for calibrating a trigger unit which is connected via a trigger line to at least two sensors configured to be triggered. Each sensor is connected between two successive line portions of the trigger line. Each sensor has an input and an output, a controllable interrupter between the input and output; and a control circuit, which controls the interrupter. The interrupters of all sensors are initially open. The method comprises the following: transmitting a trigger pulse; in the sensor: receiving the trigger pulse and returning a response; in the trigger unit: receiving the response and calibrating the trigger unit; repeating the aforementioned steps, wherein each sensor reflects the trigger pulse, and the trigger unit measures the propagation times and is calibrated thereto.

Abstract: A method for measuring the position of a surface of a vehicle on a roadway comprising the following steps: transmitting and receiving radar beams at transmitting and receiving positions in various primary transmitting and primary receiving directions and converting these beams into received signals; selecting the received signal having the greatest signal strength; and determining the aforementioned position from the transmitting and receiving positions and the primary transmitting and primary receiving directions of the received signal having the greatest signal strength.

Abstract: A method is disclosed for warning in case of wrong-way travel of a vehicle on a directional carriageway by means of an on-board unit carried by the vehicle, said on-board unit determining its position and direction of movement in a satellite-assisted manner, comparing the latter with a target direction of movement stored in a digital road map for this position and outputting a warning message when detecting a wrong-way travel, comprising: for a temporary change in course of a section of the directional carriageway, providing a radio beacon arranged upstream to said section and having a local radio coverage range; when the on-board unit enters the radio coverage range of the radio beacon, receiving a message sent by the radio beacon concerning the change in course in a transceiver of the on-board unit; and detecting the wrong-way travel depending on the received message.

Abstract: A method for localizing an on-board unit, which has a radio transceiver and an identifier, to a predefined area around a radio beacon, comprising the following steps: a) storing the identifier and an associated radio property in a database; b) sending a first request; c) receiving a first response from an on-board unit; d) determining, from the database, the radio property of the transceiver associated with the received identifier; and e) localizing the on-board unit in the predefined area; wherein: the steps b) to e) are repeated, for each run-through of the steps b) to e), a localization result is stored in a presence list, and the localizing is verified when the number of the positive localization results exceeds a threshold value.

Abstract: A method and device for radio programming wireless terminal devices, which have a unique radio identification and an optical or acoustic signal device, with a transceiver for radio communication with the terminal devices and a control device connected to the transceiver. The control device is configured for radio programming the terminal devices with a predetermined radio identification via the radio transceiver. The control device is connected with at least one optical or acoustic signal detector and is configured for transmitting a request for emission of an optical or acoustic signal to a terminal device with a predetermined radio identification via the transceiver. The terminal device is radio programmed, only when the signal detector detects an optical or acoustic signal.

Abstract: Selective radio communication between a radio beacon and an onboard unit of a vehicle passing the radio beacon comprising: in the onboard unit determining the current heading of the onboard unit and transmitting information thereon to the radio beacon; in the radio beacon checking whether the heading indicated in the heading information is within predetermined boundaries, and if so, carrying out a radio communication with the onboard unit.

Abstract: A rotating wheel of a vehicle is detected by evaluating the Doppler shift of a measuring beam emitted by a detector unit passed by the vehicle, reflected by the wheel and returned in Doppler-shifted form. In a relative position to the wheel, the vehicle comprises an onboard unit, which can establish a radio communication with a transceiver having a known location in the detector unit. The direction and distance of the onboard unit from the transceiver are measured on the basis of at least one radio communication between the same. The radiation direction or radiation position of the measuring beam is controlled in accordance with the measured direction and distance and taking into consideration the aforementioned relative position and location. The relative position is stored in the onboard unit and is read from the onboard unit by way of a radio communication for the purpose of the aforementioned consideration.

Abstract: Methods are provided for updating a digital road map in which road segments having segment lengths are stored. At least two vehicles are equipped with at least one respective onboard unit generating position readings. If a first set of position readings of a first onboard unit can be associated with a road segment, a first path length is determined based on the position readings of the first set. If a second set of position readings of a second onboard unit can be associated with the road segment, a second path length is determined based on the position readings of the second set. An average path length is calculated based on at least the first and second path lengths. If the average path length deviates from the stored segment length, the average path length is stored as an updated stored segment length of this road segment in the digital road map.

Abstract: Control devices and methods for a road toll system that is based on on-board units carried by vehicles, using at least one recording vehicle and at least one control vehicle, which communicate with a central violation server, wherein the recording vehicle reads out a toll parameter from the on-board unit of a passing vehicle via a DSRC radio interface, compares it to a shape parameter of the vehicle detected by a sensor, and based thereon, in case of inconsistency, generates a violation data record and transmits it to the violation server, wherein the control vehicle registers the position or surroundings thereof in the violation server, and the violation server makes available to this control vehicle those violation data records, the locations of the violations of which are within the surroundings of a position of a control vehicle, and wherein the control vehicle issues an alert message when it detects a violating vehicle in the surroundings thereof.

Abstract: A method for generating toll information for vehicle devices in a road-toll system with a toll center and geographically distributed radio beacons. The method includes providing a set of location data of toll-requiring geo-objects from the respective local environment of a beacon in this beacon, recording a sequence of position data of a vehicle device in this vehicle device, if the aforementioned vehicle device is in the transmitting/receiving range of a beacon: receiving the location-data set from this beacon in the vehicle device, comparing the position-data sequence with the received location-data set in the vehicle device in order to generate toll information therefrom, and if the above-mentioned vehicle device is in the transmitting/receiving range of a beacon: transmitting the toll information from the vehicle device via the beacon to the toll center. The invention further relates to a vehicle device, a beacon and a monitoring device for such a road-toll system.

Abstract: A device for suspending at least one component from a gantry, and a gantry that includes such a device includes a guide rail that can be secured on the gantry in an approximately vertical orientation, a carriage that is guided on the guide rail in a sliding movable manner and on which the component can be mounted, and a limit stop that is mounted on the guide rail beneath the carriage in a height-adjustable manner. The guide rail is divided into a lower part and an upper part, which are connected to each other by way of a pivot connection having a pivot axis parallel to the longitudinal direction of the guide rail.

Abstract: A device for measuring a vehicle on a roadway, comprising a carrier structure, which has a support axis that can be oriented transversely over the roadway, a plurality of transmitter elements, which are distributed along the support axis on the carrier structure and each downwardly emit a light measuring beam, each light measuring beam being located in an emission direction extending normal to the support axis, at least one receiver element, which is installed on the carrier structure and receives reflected light measuring beams, and an evaluation unit, which is connected to the transmitter and receiver elements for the time of flight measurement and, based thereon, measurement of a vehicle, wherein the emission directions of at least two transmitter elements are not parallel to each other.

Abstract: A parking lot with a plurality of parking spaces for vehicles that have OCR-readable license numbers and onboard units with radio IDs that can be read out via radio signals. The parking lot including a central computer for storing parking space reservations, a vehicle license number and an assigned radio ID, a radio beacon for the parking spaces for reading out the radio ID of an entering vehicle via radio and signaling the radio ID to the central computer, and at least one camera unit for each parking space for reading the license number of a vehicle and correspondingly signaling the license number to the central computer. The central computer checks whether for a radio ID signaled to the central computer the vehicle license number is subsequently signaled by the camera unit of this parking space, and to log instances in which this is not the case.

Abstract: Methods for identifying a vehicle using a predetermined location are provided, as well as a radio beacon and an onboard unit for use with the methods. One method comprises: carrying, on the vehicle, an onboard unit that broadcasts status messages that each indicate a current position of the onboard unit and a radio identifier that changes after each or several status messages; receiving at least one status message in a radio beacon; detecting a location usage of the vehicle by evaluating the status message(s) based on the position(s) indicated therein with respect to the predetermined location; transmitting an identification request from the radio beacon to the onboard unit addressed according to the radio identifier from the status message(s); receiving and conducting a legitimacy check of the identification request in the onboard unit and, if the request is legitimate, transmitting an identification of the onboard unit to the radio beacon.

Abstract: A system and method for conducting dynamic RF-link margin tests in an electronic toll collection for non-stationary vehicles travelling up to highway speed. The system maintains a list of candidate transponders and, during the course of a normal toll collection, if a transponder is on the list then the system schedules a margin test for a later handshake in the capture zone. At a location at or near the peak margin test the system conducts a margin test during one or more of the reader-transponder handshakes. The attenuation may be dynamically controlled by the system using a variable attenuator in the RF path from the reader RF module to the antenna. Distributing the margin measurement over multiple passes of a vehicle through the capture zone provides for a highway speed method of measuring link margin.

Abstract: Methods for identifying a vehicle using a predetermined location, and a radio beacon and an onboard unit are provided. One method comprises: carrying, on the vehicle, an onboard unit that broadcasts status messages that each indicate a current relative distance of the onboard unit from the predetermined location and a radio identifier that changes after each or several status messages; receiving at least one status message in a radio beacon; detecting a location usage of the vehicle by evaluating the status message(s) based on the indicated relative distance; transmitting an identification request from the radio beacon to the onboard unit addressed according to the radio identifier from the status message(s); receiving and conducting a legitimacy check of the identification request in the onboard unit; and if the request is legitimate, transmitting an identification of the onboard unit to the radio beacon that remains the same over changes of radio identifier.

Abstract: A rotating wheel of a vehicle is detected by evaluating the Doppler shift of a measuring beam, which is emitted by a detector unit passed by the vehicle, and is reflected by the wheel and returned in Doppler-shifted form. In a relative position to the wheel, the vehicle comprises an onboard unit, which can establish radio communication with a transceiver having a known location in the detector unit. The direction and distance of the onboard unit from the transceiver are measured on the basis of at least one radio communication between the same. The radiation direction or radiation position of the measuring beam is controlled in accordance with the measured direction and distance and taking into consideration the aforementioned relative position and location.

Abstract: The invention relates to a method and system for the user-specific initialization of identification devices in the field, particularly on-board units in road toll systems, based on a central facility, whereby each identification device, when delivered, has a unique device identification to which, in the central facility, a unique user identification is assigned, and in the central facility, an initialization PIN is generated from the device identification and from the user identification and is transmitted to the identification device from which the identification device, based on its device identification, computes the user identification for the user-specific initialization.