RFID Dual Frequency Sports Timing Lap System,tamperproof rfid wristband

　　RFID Dual Frequency Sports Timing Lap System

　　Application field of dual-frequency chip timing system

　　Professional sports events: track and field long-distance running, race walking, marathon, triathlon, relay race, swimming, bicycle, motorcycle, cross-country skiing, roller skating, karting and many other formal sports events;

　　Education field: widely used in school sports meeting, winter long-distance running, sports test, daily training and test of sports school, timing of high school entrance examination;

　　Army and military academies: daily training, assessment and competition, mainly used in: 3000 meters, 5000 meters, 400 meters obstacles, 10 meters × 5 round-trip running, etc.

　　1. Working principle of dual-frequency chip timing system

　　Whenever an athlete carries a dual-frequency electronic tag through the timing coil at the track, the 125K low-frequency activation antenna can immediately activate the dual-frequency electronic tag information, and the dual-frequency electronic tag actively sends data to the nearby reader in real time, and the reader will read the data. The received card data is uploaded to the connected computer, and the computer obtains the relevant information of the athlete, records the corresponding moment of passing, and uses special software to process the information. The running start time can be collected by the "Time Start" button drawn from the reader, and uploaded to the computer background system software. The background system software will correspond the collected start time and card information with the corresponding athlete information, and count the game situation, so as to realize the running time. The purpose of the project's automatic timing.

　　The system lays a set of 125K ground-sensing coils at the end point for the sports timing lap system.

　　When the dual-frequency sports timing chip tag carried by the athlete passes through the timing carpet, the carpet antenna sends the received response signal of the RFID tag to the read head connected to it, and the read head records the current time and the relevant information of the tag, that is, the timing is completed. Function. The results of the competition can be displayed in real time, and the referee or training organizer can view, edit and print the results through the timing system software installed on the computer.

　　2. Comparison of current technology of dual-frequency chip timing system

　　current technology:

　　125kHz/134.2kHz low frequency, 13.56MHz high frequency, 915MHz ultra-high frequency, 2.45GHz/5.8GHz microwave.

　　The frequency of low frequency technology is very low, which means that its carrier frequency is low, and the rate of the data signal modulated on it will be very low. In this way, the system cannot process a large amount of received data at the same time, resulting in weak anti-collision capability, and can only read several tags at the same time.

　　High-frequency technology, such as subway tickets, has a very short operating distance, only a few or a dozen centimeters. Because increasing the power makes the distance farther, it will cause a large number of blind spots in the radiation range of its antenna. That is to say, when the label or card is moved from far and near to the reader, it cannot be read at a distance.

　　UHF and microwave technologies are particularly susceptible to environmental influences, and UHF electromagnetic waves travel in approximately straight lines in the air. Metal objects can obscure RFID tags placed behind them. Liquid has the ability to "absorb" UHF electromagnetic waves, and the reading performance of UHF RFID tags placed behind the liquid will drop sharply. In addition, the performance of UHF tags is greatly affected by the material of the items to which they are attached. For common materials such as corrugated boxes, wooden boards, metals, plastics, liquid surfaces, glass, and rubber, it is necessary to develop different tag antennas. Otherwise, the reading distance of the tag may drop from 7 meters to several tens of centimeters at once, which cannot be received by the card reader. A variety of different UHF tags will bring great inconvenience to actual use.

　　It can be seen that the actual use of single frequency RFID technology has limitations. Satisfactory results can only be achieved in the application scenarios that are most suitable for the technical characteristics of this frequency.

　　One can't help but wonder if a technology could be developed that would take the advantages of different frequencies while discarding their drawbacks. RFID dual-frequency technology (125K and 2.45G) was born in expectation.

　　Advantages of dual frequency technology:

　　The 125K low frequency receiving frequency ensures extremely high data transmission rate and strong anti-collision ability, so the system can read multiple chips at the same time.

　　Because 2.45G microwave is the receiving frequency, and the receiving distance of the card reader, the sensitivity index is easy to do well. Therefore, it can have a good reception effect in the entire 2.45G antenna radiation range, and there will be no signal coverage blind spots.

　　Dual-band technology combines the advantages of 125K low frequency and 2.45G microwave technology and discards their shortcomings. At present, dual-frequency technology is the only technology in the world that can truly achieve simultaneous timing of chip electronic tags by multiple people.

　　3. Timing system hardware introduction

　　Timing system reader

　　Timing chip label

　　Timing Carpet/Induction Coil

　　1) The dual-frequency motion timing induction coil needs to be connected with the dual-frequency reader to complete the timing function. When the timing induction coil receives the response signal from the dual-frequency timing chip tag, the read head records the current time and tag ID number. The timing induction coil can be used in a variety of environments and is waterproof. It can be used for running, cycling, and snow sports; the carpet is quite durable.

　　2) The ground induction coil contains an independent induction loop (125kHz activates the tag to wake up) and a receiving loop (2.45G receives the tag response signal). Sometimes the resonant frequency of the loop is affected by surrounding metal objects (such as reinforced concrete, water pipes, etc.), which affects the reading distance. For this reason, a special automatic tuning circuit is included in the read head to reduce this effect to a minimum.

Read recommendations:

M04 ISO11784/5 Animal Microchip Implant

M03 ICAR Certifiicated Injected Under Skin Microchip

M02- Pet Microchip with Needle Pack

RFID management and control scheme of property involved,RFID Tags

RFID material receiving and dispatching management system solution,RFID Seal