A new type of long-distance vehicle automatic management all-in-one card system
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1 Current status of community vehicle management
The management of vehicles entering and leaving the community is an important issue that must be resolved for any real estate community. At present, the most common situation is that the property management office distributes a Mifare IC card or EM ID access card to the owner. The owner stops the car when entering or exiting the gate of the community, stretches his hand out of the window to swipe the card, and then raises the lever of the barrier. Vehicles can enter and exit.
In addition, some communities have introduced a long-distance wireless RFID card system to help owners realize that vehicles enter and exit the community automatically without swiping the card or parking.
There are two types of long-distance wireless RFID cards, one is a passive RFID card, and the other is an active RFID card.
Passive RFID card means that there is no battery in the card. When working, the RFID reader at the gate sends out a strong wireless signal to activate charging and transmit the ID number in the card through the wireless signal.
An active RFID card is a card with a battery, and it works on the battery in the card when it works, and transmits the ID number in the card through a wireless signal when entering and exiting the gate.
The advantage of the passive card is that it has a long working life and does not need to replace the battery. The disadvantage is that the signal is unstable. Sometimes the window film of the vehicle must be cut before the signal can penetrate the vehicle; the advantage of the active card is that the signal is relatively stable, but the working life is short, generally The battery must be replaced after working for one or six months. Another major disadvantage of this RFID card is its poor directionality and the problem of adjacent channel interference.
The owner’s RFID card system can basically realize the automatic entry and exit of the vehicle, but the owner must add another wireless RFID card, which does not achieve the all-in-one card.
2. Introduction and application of the new long-distance vehicle all-in-one card system
2.1 Introduction to system composition
According to the current status of community vehicle management and existing problems, our company has developed a new type of 2.45G long-distance vehicle all-in-one card system that uses 2.45G microwave frequency band communication.
The realization scheme of this system includes: First, develop the microwave transmitting device that can read and write MIFARE IC card and EM ID card information; Second, develop the reader that can communicate with the microwave transmitting device.
In addition to being able to read and write IC cards and EM cards, the microwave transmitter also has a microwave communication function. The microwave signal is strictly encrypted, and the uninterrupted working life is more than five years. See Figure 1 for details.
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Figure 1 Microwave transmitter with IC card or EM card inserted
In addition to the function of communicating with the microwave transmitting device, the reader also has a power control function, which can adjust the communication distance with the microwave transmitting device according to needs, and the reader can be compatible with international standard interfaces such as Wiegand 26, Wiegand 34, and RS485 at the same time. Makes the system can easily and seamlessly docking with other barrier systems. See Figure 2 for details.
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Figure 2 Microwave reader
The use of the long-distance vehicle all-in-one card system is: the reader is installed at the entry and exit checkpoint position of the parking lot, and the entering and exiting vehicles are equipped with microwave transmitters. When the vehicle enters and exits the checkpoint, the microwave transmitter on the vehicle will be inserted into the transmitter and be bound with the ID number of the IC card or EM card, and the reader will automatically receive the ID signal of the card and identify the signal. Automatically determine and record the ID of the IC card or EM card of the incoming and outgoing vehicle, and carry out comprehensive management such as safety inspection and charging.
This long-distance working method of the system can ensure that the majority of car owners do not need to stop when driving in and out of the gate of the community, nor do they need to extend their hands out of the car window to manually swipe their cards. Owners can enjoy the safety management service of automatically entering and exiting the gate without stopping. It can save a lot of time and fuel consumption caused by parking.
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2.2 Advantages and characteristics of the system
In addition to the advantages of being compatible with IC cards and EM cards that are currently being widely used, the system also has the following advantages:
1. The communication signal is strictly encrypted, and the microwave signal received by other wireless receivers is distributed with white noise.
2. It can completely overcome the adjacent road interference. The signal of the microwave transmitter has strict directivity, and only receives the microwave signal from the front 60 degrees.
3. Long service life (up to five years).
4. The sensing distance is 1-20 meters, and the best sensing distance is 7 meters.
5. With anti-theft function: you can set the user card that is uniquely bound to the microwave transmitter, and other cards cannot be used on the microwave transmitter. If the owner leaves the vehicle, if he takes his user card from the microwave transmitter, it will be impossible for others to drive his car out of the scope of the management system.
In addition, the system is equipped with a working status signal indicator, which can be used to determine the normal working status and fault status of the system; the system is highly integrated, easy to install, and user information security is guaranteed.
2.3 Comparison of the new long-distance vehicle all-in-one card system and RFID system
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According to the above comparison, it can be seen that this system has all-round advantages over the RFID currently in use.
2.4 Some technical issues involved in the 2.45G long-distance all-in-one card system application cases of the long-distance all-in-one card system
The 2.45G long-distance all-in-one card system involves many core technologies, such as low-power reader card technology, low-power communication technology, microwave microstrip line design technology, directional antenna design technology, microwave wake-up technology, signal encryption technology, power control Technology and so on. It is precisely because of the support of these technologies that the system has the advantages that RFID does not have, and at the same time ensures that the system has the characteristics of small size, good integration, easy installation, and long service life.
It is foreseeable that the system will bring great convenience to the vehicle management of large communities, parking lots, highways, etc., and has great economic and social value.
3. Application case of 2.45G long-distance all-in-one card system
At present, the 2.45G long-distance all-in-one card system developed by our company has been applied in many communities. Tixiang Mingyuan in Futian District, Shenzhen is one such example. In this community, car owners used to swipe their cards manually to enter and exit the gate. After installing the 2.45G long-distance all-in-one card system, car owners can fully realize automatic entry and exit without stopping, which is convenient and efficient, and is welcomed by the majority of owners.
In fact, the entrance and exit passages of this community are all close together. If a general RFID system is used, adjacent-channel interference will inevitably occur when vehicles enter and exit, that is, the system can’t figure out whether the vehicle is on the entrance or exit. , And the 2.45G long-distance all-in-one card system completely avoids the adjacent channel interference problem due to its good directionality, and the system operates normally and well, completely avoiding the adjacent channel interference problem.
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