Smart Port – Application of RFID System at Electronic Gate of Customs Supervision
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I. Overview
With the rapid development of my country’s major port construction, the port throughput ranks among the top in the world, and the continuous integration of international economic integration, as a shipping terminal to undertake logistics transportation, improve the high-tech content of logistics, improve the level of automated logistics operations, and reduce manual operations. Links, improve work efficiency, reduce logistics costs, maximize networking with regulatory agencies and government functional departments, achieve seamless system connection, form an integrated operating system, and speed up logistics, which has become the future development trend of smart port construction.
This system can be used for electronic gates in customs supervision places. It is a set of container number recognition, RFID electronic license plate recognition, electronic weighbridge data collection, electronic lock recognition system, lane signal lights and electronic barrier control system, IC card recognition The system and the real-time processing software of the electronic gate are integrated business system.
According to the provisions of the General Administration of Customs Order No. 171 “Administrative Measures for Customs Supervision Sites of the People’s Republic of China”, all customs supervision sites must install electronic gate systems. The equipment applicable to Class B gates includes electronic license plate recognition systems, lane lights and electronic gear lever control. The system, the IC card identification system and the electronic weighbridge data collection system are connected to the customs system through the real-time processing software of the electronic gate.
2. System Design Principles
The principle of meeting user needs
The principle of high cost performance
Quality First Design Principles
System Reliability Principles
System security principles
System scalability and advanced principles
System maintainability principle
Norms and Standards to Follow
3. System design goals
1. Establish an intelligent RFID gate system, which is equipped with a lane signal light electronic gear lever release control indication system, a driver IC card vehicle management subsystem, a weighbridge data collection subsystem and an electronic gate data real-time processing system. Carry out all-round supervision of vehicles entering and leaving the port area, and provide effective electronic data support for the classification of vehicles.
2. Install lane signal lights and electronic gear lever system, and control the up and down of the gear lever and the traffic lights by receiving the comparison command from the gate management system to achieve the purpose of instructing the vehicle to release.
3. Install the IC card driver vehicle management subsystem, issue the driver IC card to the vehicles entering the port area, pre-enter the basic information of the vehicle and the driver, read the data at the gate, and compare with the system at the same time.
4. Install the electronic data acquisition system of the weighbridge, collect the weighing data of the vehicles entering and exiting the gate, and calculate the weight of the goods entering and leaving the port area.
6. Through the electronic gate data real-time processing system, the equipment of all gates is integrated, and the data is exchanged with the customs supervision business system.
Fourth, the overall framework of the system
Container access management system includes: electronic license plate automatic recognition system, traffic light electronic gear lever control system, weighbridge data acquisition system, and gate integrated management system. The system block diagram is as follows:
5. System function description
5.1 Electronic License Plate Recognition Subsystem
5.1.1 Radio Frequency Identification Technology
5.1.2 RFID radio frequency technology used in vehicle license plate
We use the VF-642 license plate reader and VA-9121H antenna developed and produced by Shenzhen Wanquan Intelligent Technology Co., Ltd. in the intelligent gate system of the **** port; this system can read the container Information in license plates installed on trucks and bulk trucks, and on-site license plate replacement is possible.
Figure: Example of the use of RFID radio frequency
RFID electronic license plate application
As shown in the figure, the wireless radio frequency technology used in the electronic license plate data system consists of the following parts:
Vehicle rfid wireless radio frequency tag: the electronic license plate, used to store the internal identification ID, license plate number, frame number, vehicle weight and other information; the radio frequency tag used in the electronic license plate system is internally solidified with 128 bytes of storage space, which can be erased and written , with the ability to expand information.
Radio frequency antenna: used to transmit wireless signals to activate the electronic license plate, and at the same time receive the radio frequency signals fed back by the electronic license plate, and transmit these signals to the reader; the antenna used in the electronic license plate system has strong directivity and a long operating distance, eliminating Mutual interference of antenna signals in adjacent vehicle channels. The antenna has no significant electromagnetic radiation in other directions except the positive direction of its own working axis (even the electromagnetic radiation intensity of the mobile phone cannot be reached), which is safe for nearby operators.
Reader: Responsible for driving the antenna to transmit signals or receive signals received by the antenna, analyze and process the electronic license plate data contained in it, and transmit these data to the PC at the same time. As an external device, the electronic license plate reader is connected to a PC using a network protocol, which increases its location flexibility and reliability.
5.1.3 Features of Radio Frequency Technology
Easy to install. The electronic license plate label adopts a one-time molding package, which is not removable by itself. It is pasted on the middle and upper part of the front windshield and the center of the vehicle body of the container vehicle by using glass glue. Once fixed, it cannot be disassembled (guarantee two license plates for one car, no impostor). The antenna can be installed outdoors, and the antenna and the reader can use low-loss coaxial cables for communication. There are various connection methods between the reader and the computer, including serial communication ports and RJ45 network interfaces.
long distance. The information of the electronic license plate can be recognized at a distance of 12 meters, and the theoretical recognition distance can be up to 20 meters;
Strong anti-interference ability. The broad-spectrum frequency hopping working mode is adopted, which has strong anti-interference ability to ensure that the identification of vehicles on the left, right, and rear between adjacent channels and the same crossing is not disturbed. Due to the good directionality, adjacent channels do not interfere with each other.
Read and write speed is fast. It takes no more than 12ms to read 8 bytes from a single tag, and no more than 25ms to write 1 byte to a single tag. The high-speed reading and writing ensures that the electronic license plate can still be accurately read and written when the vehicle passes at high speed. information, the read rate is above 99.99%;
Stable and reliable work. All products adopt industrial standard design, and the outdoor part has strong adaptability to natural environment such as rain, snow and high and low temperature;
Data collection is convenient. The RFID data collected in the field is directly incorporated into the local area network through the 2100UAP.
5.1.4 RFID electronic license plate collection process
The electronic license plate system is an independent thread in the system. An electronic license plate label is fixed on the upper part of the front windshield of each container truck, which records the license plate number of the vehicle, the weight of the vehicle, and the identification ID. The identification ID is a field designed to cooperate with the “electronic license plate card management system”. The electronic license plate card management system is mainly responsible for the registration, issuance, review, cancellation, and query of electronic license plates. Because it has no direct relationship with this data collection system, it is not This details.
After the system is started, the electronic license plate data acquisition system enters the standby working state by itself after necessary initialization operations, and in this state, the signal to start reading can be accepted at any time. The electronic license plate reading operation follows the following process:
When the front-end total control subsystem finds the message that the vehicle has entered the data acquisition area (subject to the logic signal of the infrared trigger probe), it sends a start reading signal to the electronic license plate acquisition subsystem.
After receiving the signal, the electronic license plate acquisition subsystem analyzes the message, determines to use one of the two antennas, and completes the corresponding setting operation.
The electronic license plate acquisition system drives the antenna to transmit radio frequency signals by controlling the radio frequency reader. After the electronic license plate tag in the effective area receives the wireless signal transmitted by the antenna, it converts it into a weak current and provides it to the internal chip for calculation, and uses this energy to transmit the data stored in the electronic license plate tag;
The antenna receives the data signal emitted by the electronic license plate, and transmits the electrical signal to the RF reader for analysis. Through the analysis and decoding of the electrical signal by the reader, the data such as the license plate number and the weight of the vehicle are parsed. The data wireless communication process has its own verification check. Once an error occurs, it can be judged that the label is not read or the label is not read correctly. If one read is unsuccessful, multiple cyclic read operations can be performed until the tag data is read correctly or the current license plate acquisition task times out or is terminated by the acquisition end signal.
The data confirmed by the radio frequency reader (or the message that the reading fails) is returned to the electronic license plate acquisition subsystem through the network protocol, and continues to be transmitted to the front-end control system for processing. So far, the license plate number data collection is completed.
5.2 Lane signal lights and electronic gear lever system
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