DSRC (dedicated short range communication)-based vehicle positioning device, method and DSRC application system

Abstract

The application discloses a vehicle positioning device and method and a DSRC (Dedicated Short Range Communication) application system. The vehicle positioning device comprises a positioning antenna, a signal receiver, a digital processor and a digital beam shaper, wherein the positioning antenna comprises at least three receiving antennas which are arranged on a same straight line, and the receiving antennas are used for receiving microwave signals sent by a same OBU (On-Board Unit); the signal receiver is connected with the positioning antenna and used for receiving the microwave signals and then inputting into the digital processor; the digital processor is connected with the signal receiver and used for performing digital processing on the microwave signals; and the digital beam shaper is connected with the digital processor and used for performing weighted summation processing on the signals after digital processing, then forming beam signals, determining an azimuth angle corresponding to the beam signal with the maximum signal-to-noise ratio and getting position information of the OBU. According to the application, the positioning process is less prone to being affected by signal reflection and multi-path fading, so that the precision is higher, the vehicle positioning device is conductive to enabling an RSU (Rate Sensor Unit) to accurately judge whether the OBU sending the microwave signals is in a lane region covered by an RSU antenna, and the normal operation of a DSRC application can be ensured.

Description

technical field [0001] The present application relates to the field of intelligent transportation (ITS: Intelligent Transportation System), in particular to a vehicle positioning device, method and DSRC application system based on dedicated short-range communication (DSRC: Dedicated Short Range Communication). Background technique [0002] In the Electronic Toll Collection (ETC: Electronic Toll Collection) system, the roadside unit (RSU: RSU: Road Side Unit) set on the road and the on-board unit (OBU: On-board Units) installed on the vehicle pass DSRC technology In the process of information exchange, the RSU should only communicate with the OBU in the lane area covered by the RSU antenna to maintain the accuracy and reliability of communication and charging. However, sometimes, the RSU cannot determine and identify whether the OBU is in the lane area covered by the RSU antenna, so the RSU may communicate with all OBUs that send out response signals. If the reflected RSU si...

AI Technical Summary

Problems solved by technology

An existing vehicle positioning technology applied to the ETC system, such as a Chinese invention patent with an application date of December 27, 2010, an application number of 201010608098.0, and an invention title of "A Positioning Device and Method for Vehicle-mounted Units in an ETC System" , it sets a plurality of receiving antennas in different positions in the RSU, which are used to receive the microwave signals sent by the OBU, and compares the field strength of the microwave signals received by different receiving antennas, and combines the positions of different receiving antennas to perform OBU Positioning, this method is easily affected by signal reflection and multipath fading, so that the field strength fluctuation of the received microwave signal changes greatly, which is easy to cause positioning errors, so the positioning accuracy is relatively low

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