Speed checking device for vehicles

A speed measurement device and vehicle technology, applied in the field of speed measurement technology, can solve problems such as the system does not have the ability to adjust, and achieve the effect of eliminating abnormal frequency multiplication

Active Publication Date: 2012-06-13
ANHUI VOCATION TECH CO LTD
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Problems solved by technology

[0009] The technical solution disclosed in the above paper is basically the same as the radar speed measuring device used in other existing technologies. Before the AD acquisition, the saturation distortion of the signal is not processed, but a fixed signal gain is used to amplify the signal. When the radar reflection signal is too strong When signal distortion is caused by signal saturation and distortion, the system can only accept and process it, and the system does not have the ability to adjust. Of course, the frequency doubling phenomenon still exists in the processing results.

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Embodiment Construction

[0016] The speed measurement radar is mainly to provide a capture trigger signal for traffic speeding violations. Due to the limitation of the camera shooting distance, it generally provides a speed measurement capture signal within 60 meters. That is to say, the speed measurement range of our radar is mainly within 1-60 meters. According to the calculation of the loss of radio waves in free space, the difference between the signal reflected by the vehicle (ignoring the size of the vehicle's reflective surface) at 1 meter and the signal at 60 meters is 35.55DB, considering the influence of the size of the reflective surface of large and small vehicles on the signal strength.

[0017] The vehicle speed measuring device includes two digitally adjustable control amplifiers 10, 20 respectively receiving the vehicle Doppler frequency signals I and Q corresponding to the vehicle speed output by the high-frequency microwave part of the front-end radar, and the output terminals of the d...

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Abstract

The invention relates to a speed checking device for vehicles, which comprises two digital adjustable control amplifiers, A / D (analog-digital) acquisition interfaces (AD0 and AD1) of a digital signal processing control unit and a digital signal processing control unit. A control interface outputs a control signal to control the digital adjustable control amplifiers to amplify with a maximum amplification coefficient; one-time sampling and A / D conversion are carried out through the A / D acquisition interfaces (AD0 and AD1); digital filtering is carried out on an acquired signal; and finally, the digital signal processing control unit is used for processing the signal. According to the invention, the detection and the discovery of a long-range small target are ensured, sampling without distortion of a close-range big target is also ensured, a user has no need to set any parameter manually, and a system can complete the processing of an optimum signal automatically, so that the phenomenon of abnormal frequency multiplication of the speed of the vehicles is eliminated fundamently.

Description

technical field [0001] The invention relates to speed measurement technology, especially vehicle speed measurement technology. Background technique [0002] At present, in all types of imported and domestic radars at home and abroad, there is a common problem that when measuring the speed of some large vehicles or small trucks, the speed value of 1 times or 1 / 2 times is generated instantaneously. We call it the phenomenon of frequency doubling. This phenomenon has led to law enforcement disputes when the traffic police conduct traffic law enforcement. If it is not handled properly, it will directly reduce the credibility of the traffic police department's law enforcement, and if it is serious, it will cause disputes between the police and the public, and undermine social harmony and stability. At present, it is basically relying on the manual screening of the traffic police during the law enforcement process to manually eliminate illegal vehicles with obvious deviations. For...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/92
Inventor 金庆江
Owner ANHUI VOCATION TECH CO LTD
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