Dual-beam three-antenna radar and method for detecting traffic information of microwave

Abstract

The invention relates to a dual-beam three-antenna radar and a method for detecting traffic information of a microwave. In the radar based on a frequency modulation continuous wave (FMCW) system, a same voltage control oscillator (VCO) is adopted to implement a relevant dual-path microwave signal through a radio frequency switch and realize accurate traffic information detection in combination with a special algorithm; in the hardware aspect, a millimeter wave of which the central frequency is 24.1GHz or so is adopted; and the radar mainly consists of three planar array antennas and five units, namely two paths of microwave emission units, a path of microwave receiving unit, two paths of middle frequency signal processing units, a digital signal unit and a human-machine interface. By adoption of a dual-beam three-antenna technology and an ingenious design of a transceiver component, the use of a microwave singlechip integrated circuit chip is reduced to the maximum extent, so the cost is saved; furthermore, in the scheme, the advantages of a laterally installed microwave radar is kept, and a real-time speed, a running direction and the type of a vehicle can be detected accurately; and the interference resistance capability of adjacent vehicles is improved.

Description

technical field [0001] The invention relates to a dual-beam three-antenna microwave traffic information detection radar and a method thereof, in particular to a side-mounted double-beam three-antenna microwave traffic information detection radar with ultra-high detection accuracy. It belongs to the field of traffic information collection in intelligent transportation system Background technique [0002] Real-time traffic information is one of the most basic information sources of the intelligent transportation system (ITS). Only by accurately grasping the real-time traffic information of each road can we effectively implement and exert the functions of public travel services, traffic guidance, and intelligent traffic light control. Therefore, the real-time detection technology of traffic information is one of the most core and basic technologies in ITS technology. [0003] The research on traffic information collection technology has been carried out for many years. At pre...

AI Technical Summary

Problems solved by technology

However, this side-mounted microwave radar also has its insurmountable shortcomings, which are mainly reflected in: the existence of occlusion and interference between vehicles, the inability to measure real-time vehicle speed, and the inability to accurately detect the length of vehicles, etc.

These parameters are very important for ITS applications. The root cause of these problems is that the radar installed on the side of the road only has a single microwave beam. Since this radar uses a frequency modulated continuous wave system (FMCW), The direction of vehicle travel is perpendicular to the microwave beam, so the vehicle speed cannot be measured directly, so the vehicle type cannot be accurately detected

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