High-precision radar velocity measuring system and velocity measuring method

Abstract

The invention discloses a high-precision radar velocity measuring system and velocity measuring method. The high-precision radar velocity measuring system includes a 24.15G continuous wave radar antenna; a back-end digital signal processing unit includes a signal conditioning circuit, a main controller, a 5V to 3.3V circuit, RS485 serial communication, RS232 serial communication and a 5V power supply; the 24.15G continuous wave radar antenna continuously transmits 24.15G sine wave signals and processes feedback signals to obtain a Doppler frequency difference; the signals enter into the signal conditioning circuit in the back-end digital signal processing unit for filtering and amplification processing, and the filtered and amplified signals are sent into an ADC port of the main controller; the main controller conducts Fourier transform of the signals into speed and direction of movement information of a vehicle, and triggers a camera to take photos if the vehicle drives over the speed limit. The invention is high in load capacity and reliable in operation; and has a high test precision and achieves real-time camera capture of violation vehicle license plate, and a host computer is capable of real-time monitoring, and plays an important role in reduction of the occurrence of traffic accidents.

Description

technical field [0001] The invention relates to the technical field of road traffic, in particular to a high-precision radar speed measurement system and a speed measurement method. Background technique [0002] In the prior art, photoelectric speed measurement, coil speed measurement and radar speed measurement are the main methods of vehicle speed measurement. The coil speed measurement is buried under the road. When the vehicle passes the coil, the vehicle deforms the coil, and the detector calculates the vehicle speed according to the change of the coil magnetic field. However, the construction and later maintenance costs of this method are high, and the system will be paralyzed during installation. , not suitable for large-scale promotion and application; the installation of photoelectric speed measurement is relatively simple, and the measurement accuracy is high when the vehicle passes at low speed, but the accuracy is low when the speed exceeds 150km / h, and the speed...

AI Technical Summary

Problems solved by technology

The coil speed measurement is buried under the road. When the vehicle passes the coil, the vehicle deforms the coil, and the detector calculates the vehicle speed according to the change of the coil magnetic field. However, the construction and later maintenance costs of this method are high, and the system will be paralyzed during installation. , not suitable for large-scale promotion and application; the installation of photoelectric speed measurement is relatively simple, and the measurement accuracy is high when the vehicle passes at low speed, but the accuracy is low when the speed exceeds 150km / h, and the speed measurement range is limited; radar speed measurement is currently the main method for detecting vehicle speeding However, most radar speed measurement systems use a single-chip microcomputer as the main controller and adopt the method of counting frequency discrimination. The test circuit is complex, the measurement function is single, and the accuracy is not high, which seriously limits the application and promotion of the product.

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