At present, people are paying more attention to the quality of meat products and dairy products. At the same time, people are paying more and more attention to the reliability of the quality of these products. This poses a new challenge for some enterprises and requires enterprises to have a complete Management system for the production of these products, the process of strict supervision and control. However, over the past decade or so, the continuous outbreak of animal epidemics in the world, such as mad cow disease, streptococcus suis, foot-and-mouth disease, bird flu and the like, have posed grave threats to the health and life of the people and have also dealt a heavy blow to livestock husbandry around the world Industry, which has aroused great attention of all countries in the world. To this end, the governments of various countries quickly formulate corresponding policies and take various measures to strengthen the monitoring and management of animals, of which animal identification and tracking has become one of these major measures. For example, the British government has mandated that all kinds of tracking and identification be used for animals such as pigs, horses, cattle, sheep and goats.
The purpose of this system research is to establish a complete, flexible and convenient management system by using Radio Frequency Identification (RFID) technology to improve the modern management level of pig farms. At the same time, it is convenient for managers to promptly solve problems in pork and its products Identify the source of the disease, so as to make the appropriate treatment to avoid the loss of expansion. RFID is a non-contact automatic identification technology, with the characteristics of large amount of data storage, read and write, strong penetration, long read and write distance, fast read speed, long service life and good environmental adaptability. And it is the only automatic identification technology that enables multi-target recognition.
1 System structure and working principle
RFID-based animal identification and tracking management system consists of RFID radio frequency card, reader and computer network composed of three parts, shown in Figure 1. The reader is generally used as a computer terminal for reading, writing and storing data of an RFID radio frequency card. The reader is composed of a control unit, a high frequency communication module and an antenna. The reader system includes two fixed and handheld. An RFID card is a passive transponder. It mainly consists of an integrated circuit (IC) chip and its external antenna. The RFID chip usually incorporates circuits such as RF front-end, logic control and memory, and some even integrate the antenna together On the same chip.
RFID animal identification system structure The basic working principle of the system is: when a pig with "ear studs" (RFID card) into the reader RF field, the induced current obtained by the antenna is boosted by the boost circuit As the chip's power supply, at the same time, the induced current with information through the RF front-end circuit to detect the digital signal into the logic control circuit for information processing; the required information is recovered from memory access through the logic control circuit back to the RF front-end circuit, and finally Send back to the reader through the antenna.
The computer network obtains the information of pigs in the farm through the interface and integrates the basic functions required for the daily management of the pig farms. All the records, statistics and reports originally involved in the daily management of the pig farms are all done by hand Achieve computer management. The system basically meets the needs of current production management in pig farms and provides information from the macro-decision-making so that managers can understand the pigs in time and accurately
Field management, improve the level of modern management.
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2. "Earrings" (RFID card) installation
At present, the basic methods for installing electronic tags for animals are collar-style, ear-tag, injection-type and pill-type electronic tags,and various tags have their own characteristics and application scope. The cost of a collar tag is too high, whereas injection and pill tags are not suitable for pigs, and so the system uses a "stud" tag. Ear-studded electronic tags not only store more data, but also anti-dirt and rain. The information stored in the "ear nail" radio frequency card includes: the address of the pig farm in the township, postal code, breed information, date of earring wear, quarantine and immunization information, disease information, genealogy and reproductive information, slaughter date, etc. This information must cover the entire life cycle of this pig from birth to facilitate the identification, tracking and management of pigs.
2.1 RFID tag reader implementation
There are two kinds of RFID tag readers used in this system: one is a fixed reader; the other is a handheld reader. The main difference between a fixed reader and a handheld reader is that the handheld reader can read a large amount of RFID tag information and then input the information into the system software platform through the USB interface or the COM port of the pc machine in. The fixed reader after reading the RFID tag information is transmitted to the software platform in real time, without having to store in the reader. Fixed reader is installed in a fixed position piggyback, CAN bus network and software platform for real-time data and information exchange. Handheld reader is very easy to use, after reading the RFID tag information and then concentrated with the Pc machine for data exchange.
Fixed reader MCU can use 16-bit microcontroller, embedded software platform written in C language. MCU firmware responsible for the entire reader RFID tag identification and read and write control, as well as software platform through the CAN network for communication and data processing. LCD dot matrix display module as a software platform, an auxiliary display terminal. (2) CAN network control module: The CAN bus network has a communication distance of 1.5 krn at a baud rate of 9600, and the communication physical transmission medium is simple. Only two-core twisted pair and can form a bus network, CAN bus network in the twisted pair transmission of physical signals is differential voltage signal, anti-interference ability, transmission distance, control through the CAN network control module to multi-host Way communication CAN network control module is responsible for network status monitoring and network communication arbitration and other work, so that bus network communication to work without blocking.
(3) 900MHz RF Signal Processing Module: It is responsible for the modulation and demodulation of 900MHz RF signals and the read / write control of RFID tags by 900MHz radio waves. The 900MHz RF signal processing module can be controlled by transmitting energy The RFID tag identifies the sensing distance and uses anti-collision technology to identify multiple RFID tags within the sensing area. The module and MCU control unit through the parallel port connection, MCU can command to control the module for processing.
(4) The reader can read and write multiple RFID tags, set the read / write distance and direction of the RFID tags, and the reader can judge whether the RFID tags are read or written repeatedly by themselves.
3 System software design
In order to effectively adopt modern management methods and organize production reasonably, we carefully analyze the logistics activities in the pig farms. Through the investigation of a modern pig farm, the management targets in the pig farm include not only pigs, but also pork and its products, feedstuffs and staffs. Therefore, the system has set up 9 functional modules: system management, pigs Only maintenance management, growth and development management, feeding management, reproductive management, disease management, epidemic prevention management, tracking information inquiry and pig farm data management
The entire system platform using C / 5 technology, the database using SQLServer2000, dealing with internal affairs of the system. Front-end development platform using Delphi6.0 design, the system uses multi-threading technology, you can achieve the use of RFID tags on the pig farm reader status monitoring. After several months of operation, the system was in good condition and basically met the expected requirements.
Tag will become the "ID card" of livestock products entering domestic and foreign markets. The introduction of national standards for electronic labels and the widespread application of electronic labels will greatly enhance the logistics management capabilities, quality supervision capabilities, traceability and competitiveness in international trade of livestock products, as well as standardize and purify the livestock product market.
Therefore, further research and use of RFID technology in animal identification and tracking management will promote livestock husbandry to a higher level