Abstract: A method for providing location-specific data services to vehicles that carry onboard units for short-range communication with tolling stations at known locations in a road-tolling system and mobile terminals for data reception in a mobile communication network. The method includes: storing a list of service IDs, a mapping between a device ID and a terminal ID, and at least one booking of a service ID for a device or terminal ID within the road tolling system; transmitting the device ID of an onboard unit to the tolling station; retrieving the booking of the service ID for the device ID or the mapped terminal ID; testing whether the service ID from this booking is included in the service ID list, and if so, transmitting of the mapped terminal ID to the data service; and providing this data service via the mobile communication network to the mobile terminal.

Abstract: Methods are provided for determining the length of a path traveled by a vehicle using an onboard unit that generates a sequence of position readings and a related position quality index for each position reading. A set of consecutive position readings is extracted from the sequence. Position readings are discarded having position quality indices falling below a threshold. A set quality index is determined based on the number of position readings of the set or on the position quality indices. If the set quality index exceeds a threshold, the path length is determined based on mutual distances of consecutive position readings of the set. Otherwise, the path length is determined using a digital road map composed of road segments by associating the position readings of the set with at least one road segment, and determining the path length based on the segment length of the at least one road segment.

Abstract: A control vehicle for a road toll system on the basis of vehicle-mounted onboard units which can be polled via DSRC radio communications, with the control vehicle comprising at least one DSRC transceiver with at least two antenna systems, which are distributed with a mutual distance over the longitudinal direction of the control vehicle, for polling a passing on-board unit.

Abstract: An assembly for electrically recharging vehicles, to which individual radio units are assigned, having a parking space for a vehicle, a recharging station assigned to the parking space for cable-connected recharging of a vehicle located therein, and a transceiver connecting to the recharging station for communication with a radio unit, wherein the transceiver clears the recharging station for the recharging process depending on the communication with the radio unit, and the transceiver has a communication zone, which is restricted to the region of the parking space or can locate a radio unit as being located in this restricted region.

Abstract: Device for cooling an electrical cabinet including a hollow upright beam having a lower end, an upper end and a cavity inside, the upright beam having an air inlet at the lower end and an air outlet at the upper end, the upright beam supporting the electrical cabinet on a side of the upright beam. The device further includes a first flow connection formed between the interior of the electrical cabinet and the cavity of the upright beam at a level of the lower end of the electrical cabinet; a second flow connection formed between the interior of the electrical cabinet and the cavity of the upright beam at a level of the upper end of the electrical cabinet; and a sealing element at an intermediate level between the first and second flow connections to block the cavity of the upright beam.

Abstract: Determining traffic flow data in a road network comprising passing a first radio beacon and receiving a request message that at least includes a start location and a stop location; determining if an on-board unit position is within a predetermined range of the start location, and responsively starting a recording of measurement data; determining if the on-board unit position is within a predetermined range of the stop location, and responsively stopping the recording of the measurement data; and transmitting the recorded measurement data to a next radio beacon that is passed by the on-board unit.

Abstract: A method for detecting vehicles with cargo in a traffic telematics system comprising at least one radio beacon for radio communication with onboard units (OBUs) carried by vehicles and their cargo. The method including: establishing radio communications between said radio beacon and a first OBU, and between said radio beacon and a second OBU, via radio signals; electronically evaluating said radio signals; and when said evaluation indicates that said first and second OBUs are moving at a limited and constant distance from one another, receiving characteristic data from the first OBU in the radio beacon, transmitting the characteristic data from the radio beacon to the second OBU, and recording the characteristic data in a memory of the second OBU.

Abstract: A system and method for detection of vehicle license plates including a video camera that has a first operating mode in which it generates a first image sequence of a small, strip-shaped section of its optical camera image at a high frame rate, and a second operating mode in which a second image sequence of its entire optical camera image is generated at a lower frame rate. In the first operating mode, at the time of the detection of a license plate in the first image sequence, the video camera is switched to the second operating mode to generate an image, which contains the license plate in or near the mentioned section.

Abstract: System and method for determining the distance between a radio beacon and a vehicle device passing in the radio beacon, in a road toll system. A signal having a known temporal profile is emitted by one of the radio beacon and vehicle device. The signal is captured in the other component during the passing of the device and the temporal profile of the frequency is recorded in relation to the known temporal profile; a modification in the recoded frequency profile exceeding a first threshold value is detected; two distant wave zones in the frequency profile, lying temporally in front of and behind the detected modification are determined, the zones displaying a frequency modification below a second threshold value are searched for; the recorded frequency profile is scaled in such a way that the distant wave zones take the predetermined values; and the distance is determined from the scaled frequency profile.

Abstract: A radio beacon and a method for selective radio communication with a first onboard unit and a second onboard unit, in which a sequence of first data packet is transmitted to the first onboard unit in a first frequency band in accordance with 5.8 GHz DSRC standards, a sequence of second data packet is transmitted or received to/from the second onboard unit in accordance with 5.9 GHz DSRC standards, wherein the transmission of a data packet of the sequence of first data packet is delayed by the duration of the second data packet if the second data packet appears in the second frequency band.

Abstract: A method for determining the length of the route travelled by a vehicle using a position measuring device that records positions of the vehicle and a digital road map, which is composed of road segments of known segment lengths. The method including recording positions of the vehicle on the route by means of the position measuring device, matching the recorded vehicle positions to a sequence of road segments, and determining the route length from the segment lengths of these road segments, wherein from the angle between at least two consecutive road segments and an assumed road width of the two road segments, a turn-off route of the vehicle from the one road segment into the other road segment is calculated. The calculated turn-off route is taken into consideration in the determination of the route length.

Abstract: The invention relates to a method for determining the distance between a radio beacon and a vehicle device passing in front of said radio beacon, in a road toll system. A signal of a frequency having a known temporal profile is emitted. Said method consists of the following steps: the signal is captured in the other component when passing and the temporal profile of the frequency is recorded in relation to the known temporal profile; a modification in the recorded frequency profile exceeding a first threshold value is detected; two distant wave zones in the frequency profile, lying temporally in front of and behind the detected modification, which displays a frequency modification below a second threshold value, are searched for; the recorded frequency profile is scaled in such a manner that the distance wave zones take the predetermined values; and said distance “a” from the scaled frequency path is determined.

Abstract: Detecting a speed violation of a vehicle traveling from a first roadside system to a second roadside system comprises: protecting evidence data collected at two roadside systems by encrypting each set of data with random session keys at each roadside system, and then encrypting the random session keys with a public key generated from an identity that may include a vehicle identifier and a timestamp. A ratio of the public keys is calculated and used to detect a violation, whereupon a private key is obtained for decrypting at least one of the encrypted session keys, and decrypting at least one of the encrypted evidence data with the decrypted session key.

Abstract: A method for calibrating the image (3I, 3II) of a camera (1), and, in particular, a traffic-monitoring camera, with respect to its viewing space, such that the camera projection parameters (mk1) of a camera projection of the viewing space onto the image are determined, includes the steps of providing a movable carrier (4) with at least four markings that can be viewed by the camera (1) and that span a volume and that form known first world points (wi) in the viewing space, recording a first image (3I) of the viewing space, shifting the carrier (4) in the viewing space by an unknown offset (v) in order to obtain second world points (wi) dependent on this offset in the viewing space, recording a second image (3II) of the viewing space, detecting the markings in the first image (3I) as first image points (pi) and in the second image (3II) as second image points (pi), and determining the camera projection parameters (mk1), while also determining the offset (v), from the known first world points, the second world

Abstract: A system and method for Dedicated Short-Range Communication (DSRC) between beacons and onboard units of a road toll system, wherein the beacons have a system-wide key and the onboard units have only individual keys, which are respectively formed from the system-wide key on the basis of a derivation code specific to the onboard units, wherein upon a communication from the onboard unit the derivation code is transmitted to the beacon in order to enable the beacon to emulate the individual key to encrypt/decrypt the communication with the onboard unit and/or for access to data stored in the onboard unit, and wherein upon communications with consecutive beacons the onboard unit transmits varying derivation codes.

Abstract: A method for detecting the wheels of a vehicle that is traveling on a roadway in a travel direction and whose wheels project downward from the vehicle body and are at least partially exposed laterally at the level of the vehicle body, with the steps: emitting a concentrated electromagnetic measurement beam with a known temporal progression of frequency from the side of the roadway onto an area a predetermined distance above the roadway and at a slant with respect to the travel direction, receiving the measurement beam reflected by a passing vehicle and recording the temporal progression, relative to the known progression, of its frequency, and detecting a rectangular pulse occurring in the recorded progression within the time period when the vehicle body passes, as a wheel.

Abstract: A vehicle wheel is detected by emitting a measuring beam, recording frequencies of a reflected measuring beam over time as a received signal, and detecting a change in the received signal as a wheel. The vehicle comprises an onboard unit that stores information that indicates the vehicle length at least indirectly. The information is read from the onboard unit by a radio communication and the speed of the vehicle is measured. The duration of the passage of the vehicle passing a detector unit is computed based on this information and the speed. A time window in the received signal is determined that shows an approximately constant change of the received signal over the aforementioned duration. A spurious signal component is determined in a segment of the received signal that immediately precedes the time window. The received signal in the time window is compensated by the spurious signal component.

Abstract: A radio-frequency identification (RFID) reader having fast-adaptive echo cancellation for backscatter-modulated signals is described. The echo cancellation includes subtracting an RF-level cancel signal from the received signal, where the cancel signal is generated based upon an error measured in the receive signal after down-conversion to baseband and low-pass filtering. The cancel signal is based upon a cumulative sum or integral of error signals and an estimated complex-valued transfer function of the scaling circuit. Methods of quick calibration of the reader are described, including accounting for circuit offsets and determining the estimated complex-valued transfer function.

Abstract: Control devices and methods for a road toll system that is based on vehicle-based on-board units, using recording vehicles, control vehicles and a 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 a control vehicle such violation data records, the locations of the violations of which are within the surroundings of a position of the control vehicle, wherein the control vehicle issues an alert message when it detects a violating vehicle in the surroundings, and wherein, during the transmission of a violation data record from the recording vehicle to the violation server and/or from the v

Abstract: An apparatus is disclosed for measuring the position of a vehicle or a surface thereof on a roadway. The apparatus comprises at least one radar transmitter, which is arranged in a transmitting position above the plane of the roadway and transmits radar beams downwardly, a plurality of radar receivers, which are distributed above the plane of the roadway in different receiving positions at distances from one another, receive reflections of the radar beams from beneath, and convert the reflections into a received signal, and an evaluation device, which is connected to the radar transmitter and the radar receivers and is configured to measure the said position from the transmitting position, the receiving positions and the received signals.