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Jiangsu Tangan active 433MHz RFID tunnel construction staff attendance and location management system

chrispeng January 5, 2022 Other

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Foreword:

　　The Jiangsu Tangan RFID tunnel and urban rail personnel attendance and location management solution is developed based on active 433MHz+125KHz dual-frequency RFID technology. It is used for tunnel, urban rail personnel location management and attendance use, and overcomes the single-frequency 2.4GHz or 433MHz technology. The problem of low positioning accuracy and low effective recognition rate of people entering and exiting.

1. Project background

The personnel safety management and attendance of tunnels and urban rail projects have long been valued by all parties concerned. Due to the complex engineering environment and the large number of personnel, it has brought many management inconveniences; for important tunnel sections (such as personnel entry and exit + operation section) Accurate positioning of personnel (positioning accuracy of 5 meters) can determine the corresponding positioning section according to the degree of danger of the construction, while ensuring the effect, effectively reducing the cost of the plan; the positioning of the tunnel construction personnel can provide accurate and reliable accident rescue organization It is a necessary measure for disaster prevention to improve rescue efficiency and reduce accident losses. In addition, the automatic attendance function also provides a strong basis for employees’ salary calculations, reduces the pressure of manual attendance, and at the same time avoids the negligence of manual attendance.

2. Program features and advantages

1. Accurate positioning within 5 meters. The actual use experience has proved that the effective recognition rate of personnel entry and exit is 100%, which overcomes the low positioning accuracy of single-frequency 2.4GHz or 433MHz technology and the low effective recognition rate of personnel entry and exit.

2. The characteristic of the 125KHz exciter is precise positioning control, the boundary of the excitation area is clear, the boundary error is about 0.3 meters, and the signal excitation distance between the exciter and the electronic tag is within 1 to 5 meters.Therefore, in the early stage of tunnel construction (the depth of the tunnel is more than 10 meters), the system can be installed and put into use. It has the characteristics of accurate identification and strong adaptability. It overcomes the need for single-frequency RFID to require a tunnel depth of more than 50 meters. Disadvantages of the installation system

3. Automatic control of the swing gate without swiping the card: the same person identification card can automatically identify the relevant area of ​​the person entering and exiting the tunnel, but also automatically control the passage of people (personnel close to the swing gate and automatically open the gate), realizing automatic pedestrian and vehicle diversion

4. 433MHzActive RFIDThe technology has the characteristics of strong penetration, strong diffraction, long transmission distance, etc., suitable for various complex environments, especially suitable for complex environments such as tunnels; the electronic label can be affixed to the helmet or hung in the form of a badge On the chest, it is easy to carry

5. Automatic long-distance recognition, long reading distance (adjustable from 1 to 5 meters), no need to close to swipe the card, just follow the normal path to enter and exit to identify, suitable for batch personnel to quickly pass identification at the same time

6. If you want to manage engineering vehicles, equipment, etc., you only need to install electronic tags on the vehicles and equipment, and the reader can identify at the same time

7. The electronic tag is usually in the standby state and only emits signals when it enters the excitation zone. It has the characteristics of ultra-low power consumption, no radiation damage, and safe and reliable use.

Three, the principle of the scheme

The system consists of “application software server”, “monitoring computer”, “RFIDReader“And “433MHz+12KHz dual-frequency RFID electronic tag” (hereinafter referred to as electronic tag), etc.

1. Installation:

1) Distribute electronic tags to each employee to realize one person, one card. Employees stick the electronic tags in the helmets or hang them on their chests

2) Configure electronic tags for each vehicle to realize one vehicle and one card, and the electronic tags are pasted on the front windshield of the vehicle

3) Install one exciter on each side wall of the opening. Each exciter is equipped with an excitation antenna on both sides of its entrance and exit direction. The excitation antenna is connected to the exciter through a cable. The exciter only needs to provide power.

4) Install an exciter on the excavation trolley of the face, install an exciter antenna in the middle of the inner and outer sides of the in and out direction, the exciter antenna is connected to the exciter through a cable, and the power supply can be taken from the power supply of the excavation trolley

5) For other important road sections, refer to the installation method of the excavation trolley at the entrance or the face of the tunnel

6) Install readers near the exciters of every important road section such as the palm face, and connect to the computer through a wired or wireless bridge at the same time

7) Install an “RFID reader” about 2 to 3 meters near the exciter at the entrance of the hole to connect to the computer through the network, and install the management system software on the computer

Fourth, the schematic diagram of the scheme

1. Working principle:

When a person or vehicle with an electronic tag enters the excitation area of ​​the 125KHz exciter, the electronic tag is awakened and sends a 433MHz radio frequency signal to the outside, and the “RFID reader” obtains the electronic tag signal (the signal data includes the electronic tag ID and the excitation antenna ID) and send the information to the monitoring computer, the monitoring computer automatically judges the entry and exit status of the electronic tag according to the awakening sequence of the electronic tag in the excitation area, and records and displays it on the LED display screen outside the hole.

Five, main function introduction

1. Personnel positioning: display the position and time of personnel in real time

2. Staff attendance

3. Inquiry and statistics of attendance records

4. Online leave application and approval function on the management terminal

5. Online query function: query and statistics of attendance records

6. Query the current location and historical location of employees online

Six, the program site

(Subway construction staff positioning system)

Seven, hardware product introduction

1. ETAG-R701 433MHz active fixed RFID reader

2. ETAG-R703 433MHz (125KHz) active RFID incentive reader

125KHz part:

433MHz part:

3. ETAG-T705 active 433MHz (125kHz) dual-frequency RFID excitation tag

433MHz part:

125KHz part:

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