171 results about "Dedicated short-range communications" patented technology

DSRC (Dedicated short range communication) is expected to play a significant role in Transportation applications for Public Safety and Traffic Management. Some of the key applications especially safety and mobility application requires an accurate representation of the road segments. Accordingly, here, in one example, we describe a method and infrastructure for DSRC V2X (vehicle to infrastructure plus vehicle) system. This presentation, e.g., adds the following improvements on the existing technologies, as some of the examples: (a) Using Speed-Profiles for identifying Intersections/mandatory-stops/Speed-limits, etc. Also, the extension of the map coverage using speed profile data. (b) Vehicular density identification for determining confidence of generated MAP. (c) Mechanisms for identifying Lane Attributes, like Lane-Width, Lane-Connections, Possible Movement states, average travel-time on the lane, etc. In this presentation, we provide various methods and systems to manage and update such maps and its corresponding information, plus many variations on those.

In a vehicle-onboard dedicated short-range communication (DSRC) apparatus for the DSRC communication system, a command judgment unit of an electronic toll communication-security application module (ETC-SAM) judges the type of command included in a communication signal transmitted between a HOST and an IC card with user information held therein. A command control unit of the ETC-SAM controls whether the command is to be analyzed, according to a result of judgment by the command judgment unit. Therefore, it is possible to simplify a communication procedure and reduce a communication time.

A system and method for authenticating a message transmitted in a vehicle-to-vehicle communications system. The sending vehicle will attach raw GPS data to a transmitted message it receives from GPS satellites that the sending vehicle uses to determine its own position. The transmitted message will also include the position of the sending vehicle that the sending vehicle has determined using the GPS data. The receiving vehicle will use the raw GPS data in the message and an RTK process to determine the position of the sending vehicle. The receiving vehicle will compare the position of the sending vehicle in the message with the position of the sending vehicle determined from the GPS data, and if they match, will authenticate the received message.

The invention discloses a method for curve synergy collision avoidance early warning based on dedicated short range communication. The method specifically comprises the steps that real-time position information of an automobile of a user is obtained and whether the automobile enters a curve zone or not is judged with the combination of an electronic map; if the automobile enters a curve, traveling information of the automobile of the user is broadcasted to the surroundings and whether an automobile traveling oppositely exists or not is inquired through a dedicated short range communication device; if the automobile traveling oppositely exists, traveling information and position information of the automobile traveling oppositely are obtained and combined with the traveling information and the position information of the automobile of the user, the smallest lateral distance and time needed when the two automobiles meet are predicated, and the smallest lateral distance and the time needed when the two automobiles meet are compared with a set threshold value so that collision avoidance early warning in levels can be achieved. The method for curve synergy collision avoidance early warning based on dedicated short range communication has the advantages that the smallest lateral distance and the time needed when the two automobiles meet can be predicated, interaction of the automobile conditions and the early warning information is achieved through dedicated short range communication, and therefore the purpose of curve synergy collision avoidance early warning is achieved.

This presentation provides methods to track pedestrians heading angle using smart phone data. Tracking heading angle especially at or from stationary position is key for pedestrian safety, e.g., for smart cross system and pedestrian collision mitigation system. It provides pedestrian-to-vehicle (P2V) platform. It deploys smart phones or mobile devices, equipped with DSRC (Dedicated short range communication) support, to act as beacons for pedestrians: Phone can alert driver to pedestrian presence in path; Pedestrian Basic Safety Message (BSM) can aid awareness for vehicles; It can be used for bicycles, as well. It also provides pedestrian-to-infrastructure (P2I) platform. Smart phone, through DSRC/cellular, transmits pedestrian presence to crosswalks/signals: It enables advanced crosswalk lighting/warning scheme; It enables bundling of pedestrian presence to vehicles. In this presentation, we provide various examples and variations on these.

This provides methods and systems for V2X applications, such as forward collision warning, electronic emergency brake light, left turn assist, work zone warning, signal phase timing, and others, mainly relying on a GNSS positioning solution transmitted via the Dedicated Short-Range Communications (DSRC) to/from the roadside units and onboard units in other V2X-enabled vehicles. However, the positioning solution from a GNSS may be deteriorated by noise and/or bias due to various error sources, e.g., time delay, atmospheric effect, ephemeris effect, and multipath effect. This offers a novel quality filter that can detect noise and the onset of drift in GNSS signals by evaluating up to four metrics that compare the qualities of kinematic variables, speed, heading angle change, curvature, and lateral displacement, obtained directly or derived from GNSS and onboard vehicle sensors. This is used for autonomous cars and vehicle safety, with various examples/variations.

The invention relates to the technical field of electronic toll collection (ETC), in particular to a front-mounted ETC on board unit online publication system and a front-mounted ETC on board unit online publication method. The system consists of an on board unit, a mobile publication device, a remote server and an encryptor, wherein the mobile publication device is used for awakening the on board unit, and performing dedicated short range communication (DSRC) with the on board unit by using publication data acquired in real time from the remote server and key data calculated by the encryptor through a wireless communication network such as a third-generation (3G) wireless communication network; and the remote server is used for performing publication operation such as initialization, personalization and tamper activation on the front-mounted on board unit through a communication channel of the mobile publication device. According to the system and the method provided by the embodiment of the invention, the publication data can be acquired from the remote server in real time, the on board unit can be updated in real time, the respective storage of keys for operating the on board unit in each piece of publication equipment is avoided, and the security of a key medium and convenience for a publication service are improved.

The invention provides a signal lamp crossing vehicle speed guiding device based on dedicated short range communication and a method thereof. The device comprises an on-vehicle unit and a roadside unit, wherein the on-vehicle unit comprises a first data processing module, a first DSRC communication transceiver module, a first GPS module, a self vehicle information acquisition module and an HMI module. The roadside unit comprises a second data processing module, a second DSRC communication transceiver module, a second GPS module, an information acquisition module and a communication module. According to the device and the method, through information interaction between the on-vehicle unit and the roadside unit, interconnection and intercommunication between the vehicle and a driving environment can be realized. The DSRC communication transceiver module is utilized. Through vehicle-and-road coordination technology, road information around the vehicle and information of other vehicles canbe obtained. The vehicle is not an information island in the road any longer, thereby preventing collision, improving driving safety, improving traffic efficiency, realizing relatively low calculation amount and realizing easy realization.

The invention discloses a system and a method for testing dedicated short range communication (DSRC) equipment. The system comprises a testing computer, special testing equipment, a signal source and a microwave antenna, testing software is installed in the testing computer, the testing computer chooses test content and configure test parameters according to tested equipment and controls testing processes according to the test content and the text parameters, the special testing equipment generates DSRC test data under the control of the testing computer, receives response data returned by the tested equipment and sends the data after being analyzed to the testing computer, the signal source outputs the DSRC test data according to input data of the special testing equipment or programming instructions of the testing computer, the microwave antenna emits the DSRC test data provided by the special testing equipment or the signal source to the tested equipment, receives response returned by the tested equipment and provides the response to the special testing equipment, and the testing computer further determines test results according to the test data provided by the special testing equipment. By the system and the method, testing of protocol uniformity of a link layer and an application layer and key parameters and receiving performance indexes of a physical layer of the DSRC equipment can be realized, and product quality of the tested equipment can be guaranteed.

The invention discloses an automobile rear-end collision prevention early warning method and system. The system comprises a wireless communication dedicated short range communication (DSRC) device arranged at a roadside, and a vehicle-mounted wireless communication device, a data acquisition unit and a vehicle-mounted terminal which are installed on a vehicle, wherein the data acquisition unit is internally provided with a data acquisition module, a GPS module and an acceleration sensor. Through the DSRC device, wireless communication interaction between vehicles and between vehicles and roads is realized. The vehicle-mounted terminal calculates a safety distance between a vehicle and a front vehicle by use of a minimum safety distance model based on vehicle-road cooperation, an actual distance between the vehicle and the front vehicle is calculated through position information, whether a read-end collision risk exists is determined, if the read-end collision risk exists, a risk prompt is displayed on an interface of the vehicle-mounted terminal, and an alarm is given through sound. According to the invention, the cost of the read-end collision prevention early warning system is reduced, and the early warning accuracy is improved. The system has the advantages of low cost, small volume, accurate early warning and the like, thereby being applied to various road conditions.

The disclosure includes implementations for estimating a presence of an obstruction in a roadway using wireless vehicle data. A method may include receiving a Dedicated Short Range Communication (“DSRC”) message that includes path history data describing a path of a first DSRC-equipped vehicle with lane-level accuracy over a plurality of different times while the first DSRC-equipped vehicle is traveling on a roadway. The method may include determining a presence of an obstruction in a specific lane of the roadway based on the path history data. The obstruction may be indicated by the path history data because the path history data indicates that the obstruction affected the path of the first DSRC-equipped vehicle while traveling in the specific lane of the roadway. The method may include providing a recommendation to a driver of a second DSRC-equipped vehicle. The recommendation may describe the presence of the obstruction in the specific lane.

The invention claims a DSRC-based (dedicated short-range communications based) intelligent vehicle map fusion system and method; the system comprises a vehicle positioning module, a local map generating module, a DSRC module, an ADAS (advanced driver assistance systems) map interface, a target vehicle screening module and a map fusion module; the vehicle positioning module is used for acquiring position and attitude of a main vehicle, the local map generating module is used for generating a local map corresponding to the current position of the main vehicle according to data of a vehicular sensor, the DSRC module is used for receiving position, attitude and local map information issued by a target vehicle within a communication range, and transmitting the position, attitude and local mpa of the main vehicle itself, the ADAS map interface module is used for providing protocols and interfaces to access an ADAS map, the target vehicle screening module is used for screening a target vehicle on the same lane as the main vehicle, and the map fusion module is used for fusing the local map of the main vehicle and that of the screened target vehicle to generate an extended local map of the main vehicle. The DSRC-based intelligent vehicle map fusion system and method can provide multi-vehicle sensing capacity sharing to extend the ambient sensing range, helping improve intelligent vehicle assisted driving/automatic driving performance.

A traffic information transceiving interactive system based on dedicated short range communication (DSRC) is composed of a remote subscriber unit (RSU), a vehicle-mounted traffic information transceiver and a traffic control office database service system, wherein the vehicle-mounted traffic information transceiver transmits traffic accident information to the RSU through the DSRC, the RSU transmits the received data to peripheral vehicles, nearby RSUs and the traffic control office database service system so as to achieve real-time sharing of traffic accident information. The traffic information transceiving interactive system has the advantages that on one hand, accident occurrence conditions of each road section can be known by other vehicles in real time conveniently so as to effectively avoid traffic jam and on the other hand, traffic information can be timely submitted to a transportation bureau for timely handling of the traffic accidents.

The invention discloses a vehicle networking authentication method facing vehicle differentiation. In the method, a secret key management center gives a unique identifier to a public vehicle and gives a digital certificate to a private vehicle so that the vehicles with different privacy requirements are separated. After a running vehicle passes through first identity authentication and enters into a new RSU communication scope, through extracting information of a speed and the like recorded in a vehicle-mounted OBU memory module and sending to an RSU communication module, an RSU calculating module verifies a relation among a geographic position, the speed and current traffic density so as to determine that a vehicle running process possesses consistency, a vehicle identity is recorded and verified and authentication is completed again. In the invention, based on a dedicated short range communication technology (DSRC), a digital certificate and a certificateless aggregation scheme, authentication efficiency is effectively increased, forgery attack difficulty is enhanced and a certificate management burden is reduced.

The invention discloses a vehicle danger early warning system based on vehicle cooperation. A vehicle state acquisition module and a driving intention determination module are arranged in a vehicle, the vehicle state acquisition module and the driving intention determination module output induction signals to a dedicated short range communication module, the short range communication module transmits acquired signals to a vehicle danger early warning module, the vehicle danger early warning module transmits early warning signals to a human-machine interaction interface and transmits control signals to a vehicle control module, and information interaction between the dedicated short range communication module and the vehicle equipped with the vehicle danger early warning system is performed. According to the system, vehicle data is acquired via the dedicated short range communication module, whether there are potential risks is determined according to the vehicle data, compared with the general vehicle danger early warning system, the vehicle danger early warning system and the method are more effective, potential risks can be predicted, drivers are reminded in time, the vehicle can be effectively controlled, and traffic accidents are prevented.

The invention provides a DSRC (dedicated short range communication) system vehicle-mounted terminal capable of sleeping intelligently and a method for making the DSRC system vehicle-mounted terminal sleep intelligently. The DSRC system comprises a vehicle-mounted terminal and RSUs (road side units); the vehicle-mounted terminal is arranged in a vehicle; the RSUs are arranged on two sides of the road; the vehicle-mounted terminal comprises a CPU (central processing unit), a minicell, a vehicle-mounted wireless communication module, a wake-up circuit and a sleep circuit; the vehicle-mounted wireless communication module is electrically connected with the CPU; and the CPU is used for controlling the sleep circuit to start so as to make the vehicle-mounted terminal enter the sleep state. The vehicle-mounted terminal is controlled strictly to enter the work state only when communicating normally with the RSUs, and the vehicle-mounted terminal is kept in the sleep state all the way in the periods including the wrong wake-up period. Compared with the method for making the DSRC system vehicle-mounted terminal sleep intelligently by adopting a hardware time in the prior art, the method has the advantage that more than 80% power to be consumed in excess reserved period can be saved.

The invention discloses a method for estimating a dedicated short-distance communication channel based on compressed sensing. The method mainly solves the problem that in the prior art, the performance is poor when the frame length is larger. The method comprises the implementation steps that an Applebaum pilot frequency design method is adopted at a sending end to obtain a pilot frequency position and pilot frequency data, and the pilot frequency data are inserted into the sent data according to the pilot frequency position; the sending end sends data after IFFT conversion to a receiving end through a wireless channel; the receiving end conducts FFT conversion on the received data, and then extracts a data symbol at the pilot frequency position; a channel frequency domain response estimated value at the pilot frequency position is obtained according to an LS algorithm; an OMP algorithm is utilized for obtaining a channel frequency domain impulse response estimated value; DFT conversion is carried out on a channel frequency domain impulse response to obtain the channel frequency domain response estimated value. By the utilization of the compressed sensing technology, the sparseness of the wireless channel is fully utilized, the system performance is improved when the frame length is larger, and the method for estimating the dedicated short-distance communication channel can be used for vehicle-mounted communication.

The invention discloses an on board unit (OBU) for realizing electronic toll collection (ETC) by using a mobile phone. The OBU comprises an on board antenna unit and a mobile phone authentication payment unit, wherein the on board antenna unit is used for establishing signal conversion and link and at least consists of a dedicated short-range communication (DSRC) antenna, a DSRC radio frequency baseband module, a microprogrammed control unit (MCU) control module and a mobile phone connection module; and the mobile phone authentication payment unit is used for receiving charge information transmitted by the on board antenna unit and performing authentication and payment by the mobile phone. The invention also discloses the mobile phone using the on board antenna unit. The mobile phone comprises an OBU management and control module for displaying signals to interact with a mobile phone user. The OBU provided by the invention has the advantages of low promotion cost, simple use, safety and high efficiency.

An on-vehicle terminal apparatus for a DSRC system includes a mobile station (1) mounted on a car, a radio tag (2) mounted on the car separately from the mobile station (1), and a first communication means (11) provided for communication with the mobile station (1) and a base station (3) installed on a road. Information transmitted to the base (3) from the mobile (1) contains car information which serves to determine operation of application for which the DSRC system is employed. Tag information recorded in the tag (2) contains the car information. The mobile station (1) includes a second communication means (12) for communication with the tag (2). The car information transmitted to the base station (3) is acquired from the radio tag (2) through the second communication means (12). Handleability and serviceability of the on-vehicle terminal apparatus is remarkably enhanced.

The invention discloses a DSRC (Dedicated Short Range Communications) charging method and system based on a mobile terminal. The method comprises the steps of: a terminal regularly obtaining the position information of the terminal to generate the movement locus information of the terminal; according to the movement locus information, the terminal determining whether a vehicle enters a preset road, and sending the movement locus information to an ETC (Electronic Toll Collection) center control unit if the vehicle enters a preset road; the ETC center control unit conducting a transaction with the vehicular unit of the vehicle when receiving the movement locus information; and the ETC center control unit sending the transaction information to a toll station when the transaction is finished, so as to allow the allow the toll station to release the vehicle according to the transaction information. The system comprises a vehicle unit, a mobile terminal and an ETC center control unit. The method and system can fully realize sectional fare and fare in advance, increase ETC charging efficiency, facilitate vehicle traffic, and are compatible with present ETC charging lanes and electronic labels.

The invention discloses an environment-friendly vehicle orientation loudspeaker system. The environment-friendly vehicle orientation loudspeaker system mainly comprises a dedicated short range communication (DSRC) module, a data processing controller, an ultrasonic testing orientation loudspeaker module, a loudspeaker, a control key 1, a control key 2 and a power source, wherein the data processing controller leads out data lines to be connected with the DSRC module, the ultrasonic testing orientation loudspeaker module, the control key 1, the control key 2 and the power source respectively, the loudspeaker is connected with an output interface of the data processing controller, the DSRC module comprises a microwave transceiver antenna, a modem and a coder decoder, the ultrasonic testing orientation loudspeaker module comprises 16 ultrasonic detectors and 16 orientation loudspeakers, and the data processing controller is an advanced RISC machines (ARM) processor. By means of the environment-friendly vehicle orientation loudspeaker system, noise interference that is brought to other pedestrians around can be avoided to the maximum degree, and living environments of people can be further improved.

The invention relates to a vehicle rear-end collision avoidance system, method and single-chip microcomputer. A main control unit (20) is connected with an environmental perception module (10) through a peripheral communication interface, is connected with an executing unit (30) of a self vehicle through a line, and is connected with a vehicle-mounted unit (40) of the self vehicle through a dedicated short range communication DSRC interface; the vehicle-mounted unit (40) of the self vehicle communicates with the vehicle-mounted unit (40) on the front vehicle through a DSRC technique of a vehicle-mounted Ad-hoc network; the vehicle-mounted unit (40) on the front vehicle controls a front vehicle brake light of the executing unit (30) in the front vehicle through an interrupt signal generated in an electronic hardware interface. Through a preset procedure by the single-chip microcomputer, according to the speed of the self vehicle, relative vehicle speed, and the distance between the self vehicle and the front vehicle, the main control unit (20) calculates a critical security vehicle distance, judges the dangerous degree of collision generated between the self vehicle and the front vehicle in the travelling process, and then triggers relevant action of the executing unit. According to the automobile rear-end collision avoidance system, method and single-chip microcomputer disclosed by the invention, the probability of vehicle rear-end collision can be greatly reduced.