介紹一種簡單射頻識別系統(tǒng)設(shè)計。該設(shè)計包括閱讀器、應(yīng)答器和線圈3部分。由單片機(jī)控制閱讀器向應(yīng)答器發(fā)射無線信號，并接收應(yīng)答器回送的信號，再通過分析回送信號識別物品。閱讀器和應(yīng)答器之間以半雙工通信方式通信。
Abstract:
A simple design of radio frequency identification system is given in this paper.The design includes reader,responder and winding.Through MCU，signals are sent to responder from reader，then corresponding signals are sent back. According to the analysis of the signals sent back，the objects can be identified.Half-duplex communication is adopted? between? reader? and? responder.
RFID（Radio Frequency identification）技術(shù)是利用射頻通信實(shí)現(xiàn)的一種非接觸式自動識別技術(shù)。擁有廣闊的發(fā)展前景和巨大的市場潛力。本文介紹了RFID技術(shù)的原理、特點(diǎn)，深入分析了信號傳輸時所采取的反方向散射的調(diào)制方式，影響傳輸距離的因素，最后介紹了在遠(yuǎn)程RFID自動識別系統(tǒng)中的讀寫沖突和防沖突算法，更好的解決了遠(yuǎn)程RFID系統(tǒng)存在的沖突問題。
提出了一種基于PIC16F877A微控制器和CC2500射頻收發(fā)器芯片的低功耗、低成本RFID（Radio Frequency identification， 無線射頻識別）局域定位系統(tǒng)設(shè)計方法，介紹了系統(tǒng)的定位工作原理、主要硬件電路模塊及定位算法的設(shè)計和實(shí)現(xiàn)。采用基于序列號對時隙數(shù)運(yùn)算的排序算法有效解決了多標(biāo)簽識別碰撞的問題，基于射頻輻射強(qiáng)度（Received Signal Strength Indication， RSSI）和圓周定位算法實(shí)現(xiàn)了基于RFID多標(biāo)簽系統(tǒng)的平面定位。實(shí)驗(yàn)測試表明，這種射頻定位方法能夠?qū)崿F(xiàn)一定精度下的無線局域定位的功能。
4. If a modified source code is distributed, the original unmodified -- source code must also be included (or a link to the Free IP web -- site). In the modified source code there must be clear -- identification of the modified version.
This module can be used to interface to the MMC card in MMC or
* SPI modes. It supports a multiple card environment. The reset and
* identification processes assume multiple cards on the bus.
* In MMC mode, the card number is used as the RCA operand in the
* commands.
This article describes Atmel’s FingerChip technology for electronic fingerprint sensing that
combines the advantages of small size, low cost, high accuracy, zero maintenance, low energy
consumption and portability. This technology has applications in a wide range of fixed and
portable secured devices including access control systems, cash terminals, public transport, PCs,
PDAs, Smart Card readers and motor vehicles. It can be used in almost any situation where
rapid, reliable and accurate identification or authentication of an individual is required.
In the field of biometrics, palmprint is a novel but promising technology. Limited work has been reported on palmprint identification and verification, despite the importance of palmprint features. There are many unique features in a palmprint image that can be used for personal identification. Principal lines, wrinkles, ridges, minutiae points, singular points, and texture are regarded as useful features for palmprint representation.
