Dynamic vehicle detection method based on weak magnetic sensor
A weak magnetic sensor, vehicle detection technology, applied in traffic control systems, instruments, traffic control systems of road vehicles, etc., can solve the problems of dust or suspended particles, low detection accuracy, and high false detection rate.
Inactive Publication Date: 2015-10-28
710TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology
This kind of detector has the advantages of convenient installation, quick response, clear outline, etc. Its disadvantages are that it is easily affected by road environment and weather conditions, as well as dust or suspended particles in the atmosphere, the detection accuracy is low, and the false detection rate is high.
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[0017] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0018] The invention provides a dynamic vehicle detection method based on a magnetic field weakening sensor. The method obtains an adaptive floating baseline according to the magnetic field weakening disturbance data of the environment where the magnetic field weakening sensor is located, and obtains the current vehicle by analyzing the disturbance data during the detection process. traffic data. The specific detection steps are as follows: figure 2 Shown:
[0019] Step 1, such as figure 1 As shown, since the magnetic field weakening sensor detects the magnetic field relatively quickly, the present invention uses a three-axis magnetic field weakening sensor as a magnetic field weakening acquisition unit to collect traffic flow. The magnetic field weakening acquisition unit collects the magnetic field data of the current environment in real time, and tr...
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The invention discloses a dynamic vehicle detection method based on a weak magnetic sensor. A self-adaptive floating baseline is obtained according to weak magnetic disturbance data of an environment where a weak magnetic sensor is located, during the detection process, if the weak magnetic disturbance data exceeds a threshold continuously both in timing statistics for two only times, environment abnormal disturbance is determined, a baseline is updated, self-calibration is completed, and thus the sensor goes to a normal vehicle detection process. For a sensor which has gone to a normal operation process, statistics of normal passing vehicle flow on lanes can be carried out. The sensor can go to a normal working state without outside intervention, can carry out self recovery when environmental weak magnetic data abnormity happens, and meets a long-term road usage demand. The detection method has high accuracy and a reliable anti-interference capability.
Description
technical field [0001] The invention relates to the fields of geomagnetic detection and traffic flow detection, in particular to a dynamic vehicle detection method based on a magnetic field weakening sensor. Background technique [0002] According to ITS statistics, currently commonly used traffic flow detection technologies mainly include loop coils, image recognition, and infrared detection. [0003] The working principle of the toroidal coil is that when the vehicle passes through the buried toroidal coil, the electromagnetic induction of the coil changes, which triggers the electronic components to send out pulses. The system can detect whether there is a vehicle passing through by counting the pulses. Its advantage is that Its own cost is very low, and its detection accuracy is high, but its service life is very short, its replacement is very cumbersome, and its maintenance cost is high. This method of use is currently being phased out. [0004] Image recognition main...
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IPC IPC(8): G08G1/042
CPCG08G1/042
Inventor 李华文李坤刘洁裴华刚刘大兴
Owner 710TH RES INST OF CHINA SHIPBUILDING IND CORP