Vehicle detection method and device based on radar ranging technology

Abstract

The invention discloses a vehicle detection method and device based on a radar ranging technology. The vehicle detection method and device based on the radar ranging technology comprises the followingsteps: mixing a transmitted signal and an echo signal of a radar to generate a difference frequency signal; performing an intermediate frequency filtering process and an amplification process on thedifference frequency signal, and generating digital signal data; weakening the sidelobe waveform of the digital signal data through adding a Hamming form; obtaining low-frequency data of the digital signal data through a CZT transformation; and comparing the low-frequency data with a preset threshold to judge whether a vehicle is in front or not. According to the invention, the microwave receivingand sending and the CZT algorithm are combined, therefore, better detection results are obtained, and the photography of a camera is triggered more accurately; and the invention can be used to replace a channel port camera triggered vehicle detection and a road gate anti-smashing vehicle detection and the like, and has the advantages of fast detection speed, high determination precision, convenient construction and installation, and the like.

Description

technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a vehicle detection method based on radar ranging technology and a device applying the method. Background technique [0002] In the field of intelligent transportation, a detector is a widely used device for collecting traffic information and controlling traffic control equipment. At present, commonly used vehicle detectors mainly include: coil detectors, video detectors, radar detectors, etc. [0003] Coil detector: The coil acts as an inductance coil, and its inductance is related to the magnetic permeability of the space around the coil; when the vehicle passes or stays in the coil area, the magnetically permeable material of the vehicle body will change the magnetic permeability of the surrounding space, making the inductance of the coil Quantity changes. The passing or presence of a vehicle can be detected by detecting changes in coil inductance. Howeve...

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Problems solved by technology

[0006] However, because radar is greatly affected by threshold selection and noise, it is usually necessary to combine video detectors for vehicle detection: use microwave signals to form a narrow beam under the action of the antenna and cast a radio wave area on the road. Once a car enters the area, the radar can detect it. and trigger the camera to take pictures; however, in actual engineering, the radio wave irradiation area is affected by the antenna side lobe, and it is not easy to accurately control, and this method cannot obtain the distance information of the vehicle, which leads to inaccurate trigger signals for the camera, resulting in some data invalid

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