英文文獻(xiàn) 科技類 原文及翻譯 (電子 電氣 自動化 通信)39

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1、一種基于指紋識別的IC卡門禁系統(tǒng) 摘要：討論了一種具有廣泛應(yīng)用前景的指紋IC卡電子門禁系統(tǒng)，介紹了其設(shè)計方案、系統(tǒng)的總線結(jié)構(gòu)以及單片機(jī)控制部分的軟、硬件實現(xiàn)。該系統(tǒng)將成熟的指紋生物識別技術(shù)和IC卡技術(shù)緊密結(jié)合在一起，很好地解決了門禁系統(tǒng)中的身份認(rèn)證問題和紙質(zhì)門票帶來的不便，具有很強(qiáng)的靈活性、可靠性和安全性，非常適合于大型風(fēng)景區(qū)等公共場所的門禁管理。 關(guān)鍵詞：指紋門禁，智能卡，指紋識別，單片機(jī) 對于一票制而需多次進(jìn)入的地鐵、旅游勝地入口等場合，傳統(tǒng)的紙質(zhì)售票方式已經(jīng)越來越不適用于各部門管理的要求，進(jìn)行計算機(jī)電子門票管理是社會發(fā)展的大勢所趨。其中入口處的身份認(rèn)證是門禁管理的核心工作。

2、在現(xiàn)行的許多計算機(jī)系統(tǒng)中，用戶的身份認(rèn)證大都使用"用戶ID+密碼"的方法。實際上，這種方法隱含著密碼易遺忘、可傳遞、易被別人竊盜用等安全問題，同時在入口處需要密碼輸入不適合人流量較大的公共場所，因此在電子門禁中需要一種更為便捷可靠的身份認(rèn)證方案。針對于上述問題，本文討論了一種已研制成功的基于成熟的指紋生物識別技術(shù)和IC卡技術(shù)的電子門禁系統(tǒng)，它具有"人卡合一"的功能，方便可靠地進(jìn)行入口身份認(rèn)證，十分便于部門管理。 1 門禁系統(tǒng)總體方案 1.1"人卡合一"的設(shè)計思路 生物識別技術(shù)是一種根據(jù)人類的生理特征(指紋、聲音、臉孔、虹膜等)來進(jìn)行個人身份認(rèn)證的辯識技術(shù)。近年來，隨著信息產(chǎn)業(yè)的發(fā)展，生物

3、識別技術(shù)在國內(nèi)外得到了越來越廣泛的研究和應(yīng)用。其中指紋自動識別技術(shù)是當(dāng)今發(fā)展最成熟的一種生物識別技術(shù)，指紋作為人體生物識別的一種方式，它具有以下幾個顯著的優(yōu)點：(1)確定性：每個指紋在人六個月的時候形成，以后終身不會改變，即使被劃傷、燒傷，只要不傷及真皮，都不會改變他的指紋形狀。(2)唯一性：兩個完全一樣的指紋出現(xiàn)的概率非常小，不超過600億分之一。(3)取樣簡單：只需一個電容或光學(xué)的指紋采集器就可采集指紋圖像。存儲數(shù)據(jù)少：指紋識別中使用的模板只是從指紋圖片中提取的特征字節(jié)，而不是整幅指紋圖片，特征字節(jié)的大小為300~400B，存儲量相對較小。 另一方面，與磁卡相比IC卡作為個人指紋的載體又

4、具有以下幾個優(yōu)點：(1)IC卡片使用壽命較長，一般可反復(fù)讀寫10萬次以上。(2)卡片存儲容量大，具有足夠空間存放指紋圖像的特征數(shù)據(jù)。(3)加密存儲卡具有邏輯加密功能，卡片受密碼保護(hù)，可以防止非法復(fù)制。 門禁系統(tǒng)將卡持有者的指紋加密后存儲在智能卡上，并在智能卡的讀寫機(jī)具(或系統(tǒng)上)加裝指紋識別系統(tǒng)，當(dāng)持卡者將卡插入智能卡讀寫機(jī)具時，讀寫機(jī)具首先將指紋信息讀出來并要求用戶比對指紋，通過比對卡上的指紋和持卡者本人的指紋就可確定持卡者是否為卡的真正主人。這樣便保證了只有真正的卡主人才能使用這張卡。我們將這種加裝了指紋識別系統(tǒng)和智能卡讀寫機(jī)具的門閘稱為指紋IC卡門閘。將指紋識別技術(shù)和智能卡結(jié)合起來，是

5、目前門禁系統(tǒng)中最具有前景的身份認(rèn)證方案。它不但解決了紙質(zhì)門票的身份認(rèn)證難題，而且由于實現(xiàn)了"人卡合一的"計算機(jī)管理，也為管理者提供了靈活的門禁方案。 1.2 系統(tǒng)組成 基于上述設(shè)計思路和一般的實際應(yīng)用要求，一般的指紋IC卡 門禁系統(tǒng)由3個部分組成，其基于單個入口處的總體框圖如圖1所示. 門禁管理PC機(jī) 單片機(jī)控制系統(tǒng) IC卡讀寫器 電動門閘 指紋采集 校驗?zāi)K 指 紋 指紋IC卡 圖1 指紋IC卡門禁框圖 (1)門禁管理系統(tǒng) 門禁管理子系統(tǒng)完成門票管理和發(fā)卡兩項功能。其中門票管理軟件實現(xiàn)門票記錄、查詢、統(tǒng)計等管理任務(wù)。所謂發(fā)卡是指在將卡片發(fā)行給用戶之前，

6、需要由發(fā)卡機(jī)構(gòu)將卡片的應(yīng)用序列號、密碼、允許使用天數(shù)等基本信息寫入用戶IC卡內(nèi)的這一過程。一般來講，門禁管理PC 機(jī)可以通過兩種方式實現(xiàn)數(shù)據(jù)采集：利用大容量IC卡人工批量采集或通過串口互聯(lián)形成的低層電子門閘網(wǎng)絡(luò)實時地完成入口數(shù)據(jù)采集。對于有多個入口的門禁系統(tǒng)，如大型的足球體育場、有多個景點的大型自然風(fēng)景區(qū)等，需要在不同地點，安裝多個這樣的子系統(tǒng)。這時系統(tǒng)需要根據(jù)地點間距離和用戶要求，將各門票管理PC機(jī)再組成一個局域網(wǎng)，便于各入口處統(tǒng)一管理和相互間的數(shù)據(jù)傳輸。對于大型的體育場，多個入口間距離較近，采用10M 或100M的以太網(wǎng)較為合適。對于大型的自然景區(qū)或地鐵，各入口處距離較遠(yuǎn)且地形復(fù)雜，鋪設(shè)電

7、纜難，采用基于模擬通信方式的公眾電話網(wǎng)（PSTN），就基本可以滿足系統(tǒng)要求。 (2)指紋IC 卡 所謂指紋IC卡，是指記錄用戶生物指紋特征值和其它信息值的存儲IC 卡。在門禁系統(tǒng)中，指紋IC卡就是一張由用戶唯一持有的電子門票。用戶首次使用時，由IC卡門閘提取指紋并和當(dāng)前時間一起寫入卡中，以后卡持有者在每次進(jìn)入時將該卡插入讀卡機(jī)，隨后將手指伸到指紋采集窗口，讀卡機(jī)便會自動將他的指紋和卡上的指紋相比對，比對成功則啟動門閘放行，同時記錄進(jìn)入的卡號、時間等信息。目前市場上有多種型號的IC卡，對于各生產(chǎn)廠家的產(chǎn)品，特點也不盡相同。例如美國ATMEL公司生產(chǎn)的AT88C102 加密存儲卡，該卡具有1

8、kB 的加密EEPROM 、2B密碼、4 次密碼比較機(jī)會、10萬次讀寫循環(huán)能力，完全可滿足門禁系統(tǒng)的需要。 (3)IC卡 電子門閘指紋 IC卡電子門閘是本文介紹的重點，它由指紋采集驗證模塊、IC卡讀寫器、單片機(jī)控制系統(tǒng)、電動門閘4 個部分組成。其中前3個部分有機(jī)地溶于門閘的箱體之中，共同形成一個獨立的身份驗證和出、入控制終端。它可獨立于上位計算機(jī)完成卡片第一次使用時用戶指紋提取、寫入和再次使用時的身份驗證以及邏輯判斷等幾項基本操作。 1.3 IC卡電子門閘 IC卡電子門閘是指紋門禁系統(tǒng)的核心，在討論了門禁系統(tǒng)設(shè)計思路和系統(tǒng)組成后，以下將對指紋IC卡門閘各子模塊的組成和功能作進(jìn)一步的介

9、紹。 (1) 指紋采集校驗?zāi)K 數(shù)字指紋采集校驗?zāi)K包括一個35mm ×35mm光電感應(yīng)式傳感器板(即采集窗口OpticalUnit)、一個32位 CPU、動態(tài)隨機(jī)存儲器(DRAM)、閃存(Flash Memory)，可編程邏輯器件(PLD)等部件組成，其結(jié)構(gòu)框圖如圖2所示。它是一個基于第三方產(chǎn)品的獨立子系統(tǒng)(例如美國ATMEL-Grenoble division 公司的FCD4A14系列指紋傳感器等)。指紋采集校驗?zāi)K可提供一個RS-232接口與單片機(jī)進(jìn)行聯(lián)系，在微處理器控制系統(tǒng)的參與下完成以下兩個功能。首先，能采集完整的數(shù)字指紋圖像，并從中提取特征生物代碼，傳輸給單片機(jī)系統(tǒng)。其次能夠

10、自動進(jìn)行指紋鑒定：提取指紋采集圖像特征，并將該數(shù)字指紋特征生物代碼信息存儲在Flash中 ，再與預(yù)存在IC卡中的該用戶特征生物代碼信息自動進(jìn)行比較；能夠?qū)⒅讣y校驗的結(jié)果按占一定的傳輸規(guī)程傳遞給單片機(jī)系統(tǒng)。 32Bit RISC CPU 閃存 動態(tài)隨機(jī)存儲器 電源 采集窗口 PLD RS232 圖2 指紋采集校驗?zāi)？驁D (2) 電動式IC卡讀寫器 IC卡讀寫器是門閘系統(tǒng)直接與智能卡接觸的機(jī)電裝置，它內(nèi)含接口電路。CPU通過操作時序可以完成讀寫器卡片內(nèi)數(shù)據(jù)的讀取、寫入等基本操作。它是CPU對智能卡進(jìn)行讀/寫操作的橋梁。為了使系統(tǒng)更加方便快捷，我們采用了電動式入出卡控制結(jié)

11、構(gòu)。 (3)電動門閘 這里使用的是三輥電動門閘，它是門禁系統(tǒng)的執(zhí)行機(jī)構(gòu)，通過單片機(jī)控制其開、關(guān)。 (4)單片機(jī)控制系統(tǒng) 單片機(jī)控制系統(tǒng)是指紋IC卡門閘系統(tǒng)運行的核心，它負(fù)責(zé)協(xié)調(diào)系統(tǒng)各項工作，完成IC卡讀寫，指紋采集和驗證命令發(fā)送，門閘執(zhí)行機(jī)構(gòu)控制，根據(jù)用戶要求實現(xiàn)各種門閘控制邏輯，同時采用128× 64點陣型LCD(英文4 行×16字 ，中文4行 ×8字)顯示當(dāng)前狀態(tài)，根據(jù)面板輸入進(jìn)行運行模式切換等工作。 2 系統(tǒng)硬、軟件設(shè)計及性能指標(biāo) 2.1 單片機(jī)控制系統(tǒng)硬件框圖 在指紋門閘系統(tǒng)中，單片機(jī)控制系統(tǒng)硬件設(shè)計是系統(tǒng)研發(fā)的一個難點。它包括IC卡接口、輥軸控制、指紋儀接口、系

12、統(tǒng)LCD顯示和外圍存儲器擴(kuò)展接口以及系統(tǒng)電源等幾部分電路組成。其總體具體設(shè)計框圖如圖3所示。微處理器與外圍芯片采用I2C 串行總線技術(shù)：即利用AT89051的 二根I/O口線模擬I2C 串行總線時序，再采用I2C接 口器件進(jìn)行I/O口擴(kuò)展。這樣一來，雖然加大了軟件編程的難度，但是卻大大減化了硬件電路設(shè)計，提高了系統(tǒng)的穩(wěn)定性和可靠性，同時還降低了硬件成本。另外一方面，為增強(qiáng)系統(tǒng)對繼電器電弧和電磁抗干擾能力，各個工作部分采用單獨的電源供電，各個信號地之間不直接連接，用光耦隔離。電路設(shè)計中也多處采用去耦電容和選用優(yōu)質(zhì)電源，降低了交流回路的工頻干擾。 5V MCS8051 時鐘看門狗電路

13、顯示、蜂鳴 存儲器 RS232/485通訊 輥軸控制電路 指紋接口 復(fù)位電路 電源 IC卡讀寫 15V 圖3 門閘控制電路 2.2 系統(tǒng)軟件流程 是 否 是 否 否 是 有卡插入 本系統(tǒng)卡? 第一次使用? 報錯 讀卡內(nèi)指紋數(shù)據(jù)并 和本人指紋比對 比對成功? 滿足其他條件? 登錄指紋，將指紋特 征信息寫入卡內(nèi) 啟動門閘，放行 否 圖4 主程序流程圖 圖4是主程序流程圖，系統(tǒng)上電復(fù)位初始化時，讀取系統(tǒng)EEPROM中的各項參數(shù)，然后定時檢測是否有卡插入，并不斷刷新系統(tǒng)顯示。當(dāng)有卡插入時，完成IC卡檢測、指紋采

14、集校驗、門閘電機(jī)控制、入門邏輯檢驗等基本功能。 2.3 系統(tǒng)性能 對于本文所述的IC卡指紋門禁系統(tǒng)，識別性能指標(biāo)是系統(tǒng)的關(guān)鍵。經(jīng)過長期使用和多次測試，各項指標(biāo)如下。識別時間：<2s ；允許旋轉(zhuǎn)角度：±45°；特征字節(jié)大?。?00； FRR(拒真率):<0.1%；FAR(認(rèn)假率):<0.001%。工作溫度：-5℃~40℃ ；工作濕度：RH 90%；可見系統(tǒng)反映速度快，識別效果良好且運行性能穩(wěn)定。 3 小結(jié) 隨著我國信息產(chǎn)業(yè)技術(shù)的快速發(fā)展，生物識別技術(shù)和IC卡技術(shù)分別在各自領(lǐng)域取得了廣泛的應(yīng)用。在此基礎(chǔ)上，本文將兩者結(jié)合在一起提出了"人卡合一"的指紋IC卡技術(shù)思路并討論了一種指

15、紋IC卡電子門禁系統(tǒng)，討論了門禁系統(tǒng)的總體設(shè)計及門閘系統(tǒng)的單片機(jī)控制的軟、硬件實現(xiàn)。該系統(tǒng)將成熟的指紋生物識別技術(shù)和IC卡技術(shù)緊密結(jié)合在一起，很好地解決了門閘系統(tǒng)中的身份認(rèn)證問題，具有可靠性強(qiáng)、安全性高等特點。目前該系統(tǒng)已現(xiàn)場實時運行，取得了良好的運行效果。 An Intelligent Card Entrance Guard System Based on Fingerprint 【Abstract】An intelligent card entrance guard system based on

16、fingerprint identification is proposed in this paper. The total idea designed for this system is described firstly, and then the implementation of hardware and software of SCM in this system are discussed. The identification and other problems in the previous paper tickets systems can be solved very

17、 well bu using the combination of fingerprint identification and intelligent card technologies. 【Key words】Fingerprint entrance guard, Intelligent card, fingerprint identification, .Single chip microcomputer(SCM) Situations and so on subway which, tourist attraction entrance must enter many times

18、regarding a ticket system, the traditional paper booking way more and more was not already suitable for various divisional management request, carries on the computer electron admission ticket management is the social development ultimately. And the entrance status authentication is the entrance gua

19、rd management core work. In the present many computer system, user's status authentication uses " mostly; User ID+ password " Method. In fact, this method conceals the password easily to forget, may to transmit, easily by others theft with and so on security problem, simultaneously needs the passwor

20、d input in the entrance not to suit the stream of people quantity big public place, therefore needs one more convenient reliable status authentication plan in the electronic entrance guard. In view in the above question, this article discussed one kind to develop successful based on the mature finge

21、rprint biology recognition technology and the IC card technology electronic entrance guard system, it has " The person card unites " The function, facilitates carries on the entrance status authentication reliably, is very advantageous for the divisional mana. 1. Entrance guard system overall conce

22、pt 1.1 " The person card unites " Design mentality The biological recognition technology is one kind according to humanity's physiological characteristic (fingerprint, sound, the face, iris and so on) carries on individual status authentication to debate knows the technology. In recent years, alon

23、g with information industries' development, the biological recognition technology in domestic and foreign obtained more and more extensive research and the application. And the fingerprint automatic diagnosis technology develops the maturest one biological recognition technology now, the fingerprint

24、 takes the human body biology recognition one way, it has the following several remarkable merits: (1) determinism: Each fingerprint in person six month-long time forms, lifelong will not change later, even if is scratched, the burn, so long as will not injury and the dermis, will not change his fin

25、gerprint shape. (2) uniqueness: Two completely same fingerprints appear the probability is small, does not surpass 1/60000000000. (3) sample is simple: Only needs an electric capacity or optics fingerprint gathering may gather the fingerprint image. The stored datum are few: In the fingerprint recog

26、nition uses the template is only the characteristic byte which withdraws from the fingerprint picture, but is not the view picture fingerprint picture, the characteristic byte's size is 300~400B, the reserves is relatively small. On the other hand, compares the IC card with the magcard to take ind

27、ividual fingerprint the carrier also to have the following several merits: the (1) IC card service life is long, generally may repeatedly above the read-write 100,000 times. (2) Card storage capacity is big, has the enough spatial depositing fingerprint image characteristic data. (3) encryption memo

28、ry stick has the logical encryption function, the card the password protection, may prevent the illegal duplication. After entrance guard system card holder fingerprint encryption, saves on the smart card, and (or on system) installs the fingerprint recognition system in the smart card read-write

29、machines and tools, when holds the card the card insertion smart card read-write machines and tools, the read-write machines and tools first read the fingerprint information and request the user compared to the fingerprint, through compared to and holds the card myself fingerprint to the card finger

30、print to be possible to determine that holds the card whether for card genuine master. This then guaranteed only then the genuine card master to be able to use this card. We have installed this kind the fingerprint recognition system and the smart card read-write machines' and tools' roll-down door

31、are called the fingerprint IC card roll-down door. Unify the fingerprint recognition technology and the smart card, is in the present entrance guard system the brightest outlook status authentication plan. Not only it has solved the paper admission ticket status authentication difficult problem, mor

32、eover, because has realized " The person card unites " Computer management, also has provided the nimble entrance guard plan for the superintendent. 1.2 System composition Based on the above design mentality and the general practical application request, the common fingerprint IC card entrance gua

33、rd system is composed of 3 parts. (1)Entrance guard management system management system The entrance guard management.Subsystem completes the admission ticket management and sends the card two functions. And the admission ticket management software realizes management tasks and so on admission tick

34、et record, inquiry, statistics. So-called sends the card is refers to before the card release for the user, needs by to send the card organization the card application series number, the password, the permission use number of days and so on basic information to read in the user IC card this process.

35、 Generally speaking, the entrance guard manages PC machine to be possible to realize the data acquisition through two ways: Uses large capacity IC card artificial batch gathering or the underlying bed electron roll-down door network which forms through the serial port interconnection real-time compl

36、etes entry data gathering. Regarding has many entrance entrance guard systems, like the large-scale soccer stadium, has the many scenic spot large-scale natural scenic spots and so on, needs in the different place, to install many such subsystems. By now the system needed to be away from and the use

37、r request according to the place, manages PC machine various admission tickets to compose a local area network again, is advantageous for the various entrances global administration and the data transmission. Regarding the large-scale stadium, between many entrances is away from near, uses 10M or th

38、e 100M ethernet is more appropriate. Regarding the large-scale natural scenic area or the subway, various entrances are away from far, and the terrain is complex, the string cable is difficult, to use based on the analog communications way public telephone network (PSTN), basic may satisfy the syste

39、m request. (2) fingerprint IC card The so-called fingerprint IC card, is refers to the record user biology fingerprint characteristic value and other information value memory IC card. In the entrance guard system, the fingerprint IC card is one electronic admission ticket which has only by the use

40、r. When the user uses for the first time, reads in together the card by the IC card roll-down door extraction fingerprint and with the current time, the card holder when each time will enter later this card insertion card reader, will extend afterward the finger to the fingerprint gathering window,

41、the card reader then automatically compares rightly in his fingerprint and the card fingerprint, will compare starts the roll-down door to the success to allow to pass, simultaneously will record information and so on card number which, time will enter. At present in the market has many kinds of mod

42、el IC cards, regarding each Manufacturer's product, the characteristic is also different. For example American ATMEL Corporation produces at88C102 encryption memory stick, this clamping apparatus have 1kB encryption EEPROM, the 2B password, 4 password comparison opportunity, 100,000 read-write circu

43、lation ability, definitely may meet the entrance guard system's needs. (3)IC card electron roll-down door fingerprint The IC card electron roll-down door is the key point which this article said that it by the fingerprint gathering confirmation module, the IC card reader-writer, the monolithic int

44、egrated circuit control system, the electrically operated roll-down door 4 parts is composed. And the first 3 parts organically dissolve in the roll-down door box body, forms an independent identification authentication together and, enters the control terminal. It may the independence completes whe

45、n the card first use in the superior computer the user fingerprint extraction, read in with uses when once more identification authentication as well as the logical judgement and so on several elementary operation eos. 1.3 IC card electron roll-down door The IC card electron roll-down door is the

46、fingerprint entrance guard system's core, after discussing the entrance guard system design mentality and the system composition, the following will make the further introduction to the fingerprint IC card roll-down door various submodules' composition and the function. (1) Fingerprint gathering v

47、erification module The digital fingerprint gathering verification module including a 35mm ×35mm electro-optic induction board (i.e. gathering window OpticalUnit), 32 CPU, dynamic random-access memory (DRAM), dodges saves (Flash Memory), part compositions and so on programmable logical component (PLD

48、), its structure diagram as shown in Figure 2. It is one based on the third party product independent subsystem (e.g. American ATMEL-Grenoble division Corporation's FCD4A14 series fingerprint sensor and so on). The fingerprint gathering verification module may provide a RS-232 connection and the mon

49、olithic integrated circuit carries on the relation, completes the following two functions under the microprocessor control system's participation. First, can gather the complete digital fingerprint image, and withdraws the characteristic biology code, the transmission gives the monolithic integrated

50、 circuit system. Next can carry on the fingerprint appraisal automatically: The extraction fingerprint gathering image characteristic, and this digital fingerprint characteristic biology code information storage in Flash, with has in the IC card this user characteristic biology code information to c

51、arry on automatically in advance again the comparison; Can according to occupy the fingerprint verification result certain transmission regulations to transmit for the monolithic integrated circuit system. (2) Electromotive type IC card reader-writer The IC card reader-writer is the roll-down door

52、 system directly with the smart card contact mechanical and electrical installment, it contains the interface circuit. CPU may complete in the reader-writer card through the operation succession the data read, to read in and so on elementary operation eo. It is CPU carries on to the smart card reads

53、/writes the operation the bridge. In order to cause the system to be more convenient quickly, we used electromotive type entered the card control structure. (3)electrically operated roll-down door What here uses is three roller electrically operated roll-down doors, it is the entrance guard system'

54、s implementing agency, controls it through the monolithic integrated circuit to open, the pass. (4) monolithic integrated circuit control system The monolithic integrated circuit control system is fingerprint IC the Carmen brake system series movement core, it is responsible for coordination syste

55、m each work, completes the IC card read-write, fingerprint gathering and the confirmation order transmission, the roll-down door implementing agency control, realizes each kind of roll-down door control logic according to the user request, simultaneously uses 128× 64 lattice LCD (English 4 lines of

56、×16 characters, Chinese 4 lines of ×8 characters) demonstrates the current condition, carries on work and so on movement pattern cut according to the kneading board input. 2. The system is hard, software design and performance index 2.1 Monolithic integrated circuit control system hardware diagram

57、 In the fingerprint roll-down door system, the monolithic integrated circuit control system hardware design is a system research and development difficulty. It including the IC card connection, the stone roller control, the fingerprint meter connection, the system LCD demonstration and the peripher

58、y memory expands the connection as well as the system power source and so on several part of electric circuit compositions. Its overall concrete design diagram as shown in Figure 3. The microprocessor and the periphery chip use the I2C serial bussing technique: Namely simulates the I2C serial main l

59、ine succession using at89051 two I/O mouth line, uses the I2C connection component to carry on the I/O mouth expansion again. As the matter stands, although has increased the software programming difficulty, but actually greatly reduced has melted the hardware circuit design, enhanced system's stabi

60、lity and the reliability, meanwhile reduced the hardware cost. Moreover on the one hand, for the enhancement system to the relay electric arc and electromagnetism antijamming ability, each effective range uses the independent power source power supply, each signal between direct connection, uses up

61、the pair isolation. In the circuit design also many place uses the decoupling electric capacity and selects the high quality power source, reduced has exchanged return route's power frequency disturbance. 2.2 System software flow On when system electricity replacement initialization, in read syste

62、m EEPROM each parameter, then fixed time examines whether to have the card insertion, and unceasingly refurbishing system demonstration. When has the card insertion, completes the IC card examination, the fingerprint gathering verification, the roll-down door motor control, the basic logical checkin

63、g and so on basic function 2.3 System performance The IC card fingerprint entrance guard system which states regarding this article, the recognition performance index is system's key. After uses for a long time and tests many times, each target is as follows. Recognition time: <2s ；Permission degr

64、ees rotation：±45°；Characteristic byte size：400,FRR:<0.1%,FAR:<0.001%.Operating temperature：-5℃~40℃ ；Work humidity：RH 90%；Obviously the system reflection speed is quick, the recognition effect is good, and the performance characteristic is stable. 3. Subtotal Along with our country information indu

65、stries technology's fast development, the biological recognition technology and the IC card technology has obtained the widespread application separately in the respective domain. Based on this, this article unified both were proposing together " The person card unites " The fingerprint IC card tech

66、nology mentality and discussed one kind of fingerprint IC card electron entrance guard system, discussed the software and hardware which the entrance guard system's system design disciple floodgate system's monolithic integrated circuit controlled to realize. This system the mature fingerprint biology recognition technology and the IC card technology will unify closely in together, has solved in the roll-down door system's status authentication problem well, will have the reliability to be stron