Low-cost traffic information detecting radar device and detecting method thereof

Abstract

The invention discloses a low-cost traffic information detecting radar device. A microwave signal source generates a millimeter wave by adopting a dielectric oscillator; a receiving and transmitting assembly is used for receiving and transmitting a signal by a planar array antenna; a frequency mixer is used for outputting and transmitting an intermediate frequency signal to an intermediate frequency signal processing unit for processing; the processed intermediate frequency signal is transmitted to a digital signal processing unit; the digital signal processing unit is connected with a man-machine interface unit; and after the intermediate frequency signal containing traffic information is processed by the digital signal processing unit, the man-machine interface unit outputs the traffic information. The invention has the advantage of judging the existence of vehicles by utilizing speed information, thereby greatly reducing the cost.

Description

Technical field [0001] The invention relates to the field of traffic information collection in an intelligent traffic system, in particular to a low-cost traffic information detection radar device. 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 it be effectively implemented and used such as traffic guidance, intelligent control of traffic lights, speeding capture, and security checkpoints. Class ITS function, so the real-time detection technology of traffic information is the core and one of the most basic technologies in ITS technology. [0003] Research on traffic information collection technology has been carried out for many years. At present, a variety of traffic information collection technologies have been applied in practice. The traffic information collected through these technologies ma...

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 is installed on the side of the road. If it is installed on the driveway, these problems will disappear. Therefore, the simple method That is, the side-mounted radar is installed directly above the driveway. Although it can solve some problems, it cannot be completely solved, mainly because the angle of the radar antenna is too large, and there is a fatal disadvantage of doing so, that is, the cost is too high

[0006] Chinese patent number CN1400475, the patent name is "Radar radio frequency device and measurement method for traffic flow monitoring in intelligent transportation", the patent uses 35GHz millimeter wave, and uses the FMCW system modulated by triangular wave to detect traffic information, which requires voltage-controlled oscillation device (VCO) and triangular wave generating circuit, etc., the structure is complex and the cost is high

The algorithm is complex and difficult to be practically applied to low-cost solutions

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