Introduction
BSE, foot and mouth disease, avian influenza and human-animal disease Streptococcus suis in pigs in the world after the occurrence, there is a growing emphasis on animal disease control, monitoring and prevention.
Of these, animal control is one of the important measures for animal husbandry, transport, slaughter and its products processing and marketing, and other aspects of the implementation process, a full range of orderly administration and monitoring.Animal identification in practice shows, radio frequency identification (RFID) in animal management plays an increasingly important role.
RFID use RF communication implementation of non-contact automatic recognition, automatic identification by radio frequency signal target object and gets the correlation data, identify work without human intervention, can work in all kinds of bad environment, to follow the entire process of animal growth. Development of a performance of the RFID system for animal identification and tracking of vital importance, this article presents a design based on EM4469 to meet people on animals of non-contact management, outdoor long and low power consumption of animal identification and tracking of various requirements.System composition and working principle
System composition
Based on RFID technology for animal recognition and tracking management system is mainly composed of RFID, portable handheld reader and the computer network and database management software.
System as shown in Figure 1.(1) RFID tag.
In this design, the RFID tag is embedded RF chip EM4469 animal ear tag. To log the ID of the animals, the basic growth information, immunization, and quarantine information, and other administrative information. Each RFID tag has its own unique code that identifies the animal body. RFID has a smart read-write and encrypt the communication function, through radio waves and portable handheld reader for data transmission. EM4469 is passive RF chip work needed all energy comes from the portable handheld reader.(2) portable handheld reader.
Implementation of radio frequency labels EM4469 ID number identification, password, modify, and user data read and write operations. Mainly by the antenna, wireless transceiver modules, control module and interface circuits.(3) of the computer network and database management software.
Main realization and portable handheld reader of mutual communication and data exchange of information, which will receive information about the animals and the various records, statistical reports, and other content stored in a database, the data in computer management.System working principle
When the portable handheld reader for reading RFID tag, the reader will launch a fixed frequency of electromagnetic waves, resulting in the reader's antenna around to generate high frequency of the alternating magnetic field.
With RFID RFID animals into portable handheld reader launch RF range, RFID will produce in the antenna and the internal current booster circuit boost as a radio chip EM4469 power, place it in working condition. EM4469 data decompressor continuous detection signal from the antenna end, with information of the current decoding, and extract the digital signal into logic control circuitry for information processing, and finally sent to the portable handheld reader. Reader information and decoded, send it to the information systems related to data processing and save. Override the label, the reader to handle the information after the rewritten EM4469 chip.When there are multiple RFID tag into the portable handheld reader's RF field, due to conflicts with antivirus EM4469 authentication mechanism that makes portable handheld reader in interpreting the range only retained a RFID tag is active and data communication.
System hardware design
This system for animal identification and tracking, RFID radio frequency emission and read-write system related hardware design, including RFID and portable handheld reader most of the design.
RFID option
At present, used for animal recognition in the form of an electronic tag primarily Premolar have ears, tiara, implantable and pills, a form has its own features and scope.
This system uses ear nails short of RFID ear tag, it has to store data, stain and waterproof characteristics.Use the private ear tag pliers set inline EM4469 RF card ear tag nail into the animal's ear Cap with ear tag.
Ear tag nail after birth in store animals throughout the life cycle of the relevant information, the information available portable handheld reader for reading and writing.RFID tag through the RF circuit detects a portable handheld reader signals after demodulation and effective information transfer to labels within the SCM; portable handheld readers receive data information is exactly the opposite, i.e. sent RFID tag to send signal modulation, the portable handheld reader for demodulation and effective information transfer to the portable handheld reader internal MCU.
The above work mainly by RF chip implementation, this design uses EM4469 chip.EM4469 principle diagram of the main characteristics and
EM4469 is Microelectronic company launched an operating frequency of 100 ~ 150kHz with read/write functionality of contactless RFID radio frequency chip, can lower power consumption and offers a wide range of data rates and data encoding.
The RF chip not only compatible ISO11784/11785 standards, but also to ISO FDX/B animal identification standards, so is widely used in various application management system, particularly the management of animal identification and tracking. Its main characteristics are as follows:Capacity of up to 512-bit EEPROM, divided into 16 sectors, each of the 32-bit.
A 32-bit password read-write-protected.
Each
Card has a 32-bit unique ID code.With 10-digit user code.
Compatible ISO11784/11785 standards.
The lock-bit EM4469 to EEPROM data block into a read-only mode.
Has Manchester, miller, Bi-phase, FSK, PSK, encoded form.
With a variety of data transfer rate (from 1-32K Porter).
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