Positioning method, device and system

Abstract

The application discloses a positioning method, device and system. The positioning method mainly adopts two antennas of the same specification which are arranged at an interval to receive the same wireless signal sent out from a target point, a first path of signal and a second path of signal which have a phase difference are formed correspondingly, the phase difference is compensated with a varying compensation phase, when the compensated first path of signal and second path of signal are superposed, the current compensation phase that enables superposition of the compensated first path of signal and second path of signal determines an azimuth angle of the target point, since determining of the azimuth angle is completed in an extremely short time, the target point can be regarded as in a stationary state within the extremely short time, thus accurate positioning of the target point in angle can be completed, accuracy of communication with the target point after positioning is ensured, and when the positioning method is applied to an ETC system, vehicle following interference can be prevented, and vehicle passing is ensured.

Description

technical field [0001] The present application relates to the field of intelligent traffic signal processing, in particular to a positioning method, device and system. Background technique [0002] Electronic Toll Collection (ETC) is a specific application of Intelligent Transportation System (ITS). The ETC system is mainly composed of roadside equipment (Road-Side Units, RSU) and on-board equipment (On-Board Units, OBU). Usually, such as figure 1 As shown, the RSU is installed on the gantry at the entrance and exit of the toll station, above the driveway, the typical installation height is 5.5 meters, the installation angle is 45° between the main surface and the ground, and the width of the driveway is generally 3.3 meters; OBU installation on the front windshield of the vehicle. When the vehicle passes through the lane, the OBU installed on the vehicle is awakened by the RSU, communicates with the RSU and completes the information interaction process of non-stop chargi...

AI Technical Summary

Problems solved by technology

In practical applications, due to the reflection and scattering of electromagnetic waves by the road surface and surrounding objects, it is difficult for the communication area between the RSU and the OBU to have a clear boundary in the longitudinal direction of the lane (that is, the direction of vehicle traffic). figure 2 In the fuzzy communication area marked by a triangle symbol, in the fuzzy communication area, when the passing vehicles are dense, it is easy to cause interference with the vehicle, and the communication between the RSU and the current OBU will often cause the RSU and the current OBU to be located on the adjacent OBU. The failure of communication reduces the success rate of traffic opening, especially when the speed of traffic opening is fast, the RSU and OBU are required to start communicating when they are far apart. In this way, the fuzzy communication area will be larger, and it is easier to cause interference with vehicles, further Reduce the success rate of opening traffic

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