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1. Working principle
The principle of geomagnetic detection is used to detect motor vehicles. In the absence of motor vehicles, the earth’s magnetic field is in a relatively stable state. When a motor vehicle passes by, it will cause a change in the earth’s magnetic field. The wireless geomagnetic vehicle detector detects motor vehicles by analyzing changes in the earth’s magnetic field. The wireless geomagnetic vehicle detector is embedded in the ground and powered by its own battery. The vehicle information (existence, traffic, speed, vehicle length, occupancy and other traffic parameters) detected by the detector is sent wirelessly to the roadside installation Signal receiver, the signal receiver transmits the vehicle information to the application system, etc.
The wireless geomagnetic vehicle detector is buried under the surface of the parking space. Whenever a vehicle is parked, it detects the arrival of the vehicle according to the change of the magnetic field around the vehicle detector. After the signal is stable, the signal is sent to the wireless geomagnetic device installed in the appropriate location. Parking space detector base station. Similarly, when the vehicle leaves, the wireless geomagnetic vehicle detector can also detect this information according to the change of the magnetic field and inform the wireless geomagnetic parking detector base station.
2. Scheme structure
2.1 System composition
This program is mainly composed of data collection layer, data management layer, and information release layer.
2.2 Function description of each data layer
2.2.1 Data collection layer
Its main function is to obtain the basic data of the parking space status, that is, to collect and report the car or non-car information of each parking space.
2.2.2 Brief description
Through the parking status sensing function of the wireless geomagnetic vehicle detector, the real-time parking status data is captured and sent wirelessly to the signal receiver in the nearby area. The signal receiver then transmits the acquired information to the signal receiver via 2.4G wireless radio frequency. The remote signal receiving base station, after sorting the data, the signal receiving base station transmits the data to the management server uniformly through RS485, network port or wireless DTU, thereby obtaining the basic data of the parking status. Each vehicle detector, receiver, and receiving base station has a unique ID code. After the management server receives the data, it can match and correspond to the parking space, so the status of each parking space can be displayed accurately.
2.2.3 Data management layer
The main function is to organize the data reported by the receiving base station, and perform modular processing and present it through logic algorithms.
2.2.34 Parking space information release layer
The real-time parking status information released by the management center is released to the society through computers, parking information guidance screens, and mobile phone APPs. Before traveling, car owners can quickly and easily find empty parking spaces around their destinations based on the information released.
3. System functions and features
3.1 System function introduction
3.1 Real-time detection of parking spaces
The geomagnetic sensor detection method is used to obtain basic parking status data; the wireless geomagnetic vehicle detector, receiver, and receiver base station form a data collection network. The frequency of the vehicle detector to collect samples is milliseconds, thus ensuring the acquired parking status Real-time.
3.2 Parking guidance function
The parking space guidance and management system based on the Internet of Things, based on wireless sensor network and Ethernet communication, detects the usage of parking spaces through geomagnetic methods, and transmits this information to LED screens, mobile phones or end-user computers through network equipment or 3G equipment. Parkers can quickly find free parking spaces to park according to the guidance of the above-mentioned released information. Managers can count the traffic flow in different periods in time, optimize the allocation of parking resources, and improve the intelligent level of the parking lot.
3.3 Data traceability function, data statistics function
Receive the data reported by the base station to the management server, and save it regularly after processing, and provide data support for traffic monitoring units and parking lot management departments to analyze traffic data and orderly and standardized management of parking lots. When an emergency occurs, by calling the reserved data, it can be used for the purpose of event tracing.
3.4 Charge supervision function
In the second half of 2014, “Where did the parking fee go”, as an anti-corruption topic, appeared in publications different from mainstream media. How to effectively increase the supervision of tolls is a key factor to ensure that parking fees are not lost. If you use the traditional method, that is, all man-made implementations, then the loopholes in the process can never be properly resolved.
The parking management system based on the wireless geomagnetic vehicle detector, through the comprehensive processing of the data obtained by the vehicle detector, can be accurate to each parking space, the number of vehicles parked each day, and the duration of each time, and make accurate statistics. The algorithm derives the corresponding chargeable fees. Effectively eliminate management loopholes and ensure the benefits of parking lots or national finances.
3.2 System characteristics
1. High precision: The earth’s magnetic field is basically constant within a few kilometers, but large ferromagnetic objects will cause huge disturbances to the earth’s magnetic field. The influence on the geomagnetism when a vehicle passes by will reach a fraction of the intensity of the geomagnetism. Therefore, the use of a geomagnetic sensor to detect vehicles has extremely high sensitivity.
2. Convenient installation and maintenance, no need for excavation and construction, and less damage to the road surface. If the detector is damaged, you only need to replace it as a whole without checking the circuit.
3. The geomagnetic sensor uses the change of the earth’s magnetic field when ferromagnetic objects pass through to detect, so it is not affected by the climate.
4. The two-way high-speed data exchange can be realized between the detector and the receiver, and there is no need to worry about the simultaneous data exchange between each detector and the receiver.
5. High reliability, working temperature -40℃~85℃, waterproof and shockproof.
6. High anti-interference: There are no special requirements for various interference sources on site, and the installation is convenient and simple.
7. The global open ISM microwave frequency band does not require application and payment.
8. Ultra-low power consumption: safer and healthier for the human body.
9. Long service life, up to more than 5 years.
10. The investment cost is low, and once the system is applied, it can greatly reduce parking lot management personnel and reduce parking lot operating costs.
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