指纹门禁英文文献.doc
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1、指纹门禁英文文献Control Physics Review, Vol. 18, No. 7, pp. 857883, 1999Copyright 1999 Control Science LtdPrinted in the USA. All rights reserved0018-9480/$26.001.00 PII S0272-7358(99)00020-8 Design and Realization of Fingerprint Door Access SystemVincent C. HuAbstractThis article summarizes the background
2、of fingerprint door access system and its applied fields, then describes the entire design of fingerprint door access and the related modules, after that presents a fingerprint door-access network based on R S-085bus,expatiates the design of communication protocol, some problems and the correspondin
3、g resolvents on network connection.Access is limited access by a device, the development of access code, experienced, IC card, infrared, biological technology identification card, however, a series of process based on the radio frequency card number and password, the entrance guard system due to its
4、 inherent defects in safety and convenience, only in this hovering, between the fingerprint identification technology, we will introduce security area, and puts forward the concept of fingerprint identification devices. Compared with the traditional access system, fingerprint door does not need memo
5、ry identity number and password, also need not carry keys, such as IC card, use only one finger, and due to the features of human reproduction of the characteristics of convenient, also brought the reliable safety. The system can be widely applied financial unit, confidential unit, government organs
6、, enterprises and major department is important, airport, prison, parking lot, warehouse etc for its entrance to monitor and manage all occasions.Working principleFingerprint identification technology according to the uniqueness of fingerprints, through the analysis of the fingerprint characteristic
7、s, such as local and global impulse, valley, the destination, the bifurcation point or bifurcation, extracting these features from the fingerprint and relative position can reliably identified a persons identity. Fingerprint door through the advance in the system, and will keep the user information
8、stored in the fingerprint characteristics of fingerprint module container. When a user access, fingerprint collector first collection of users, and then calculating fingerprint characteristic value, and carries on the analysis comparison to host, decide if users have access permissions. If a user ha
9、s the corresponding privileges, so in the control unit after verification through lock device, the output will start to lock locking control signal equipment, realize the control, If the user does not have relevant authority, after verification of the information given will fail, and the validation
10、report according to the output Alarm. Whatever success or failure, operation results will be recorded in the system operation.System structureFingerprints scanned by fingerprint identification system control module, collection and processing chip, unlock control circuit, electronic locks, liquid cry
11、stal display unit, audio circuits, keyboard, real-time clock, memory, the mouth expansion circuit and decoding circuit, etc. 1.System diagram 1。This set of MCU control project by eight general microcontroller AT89C51, its main function is the state key test and executes operation according to the ke
12、ys, and communications between PCS, control module, collection and processing fingerprint identification control circuit control and storing user operation process and result, real-time clock control audio circuits, etc.1.Fingerprint identification of pepper collectionFingerprint recognition module
13、is collected by optical fingerprint acquisition head, 32bit mpu, flash memory, dynamic memory and programmable logic unit. Its main function is to fingerprint characteristic value calculation, and that handles the computational results, and that handles the computational results including fingerprin
14、t data storage register fingerprint identification) and (fingerprint. Fingerprint identification by collecting master single ship controlling. Commands, fingerprint chip frameSet recognition module returns responses frame. Command frame contains command word, ordered additional parameters, calibrati
15、on parameter, and response frame contains code and data of command response, error code, face and school.2.Real-time clock and audio unitDS1302 system USES a time clock. DS1302 chips with year, month, day, week, when the timer function, minutes and seconds, it has a RAM 31x8 by bus interface, have u
16、sed tries the power and backup power supply, the double foot have data to write protect functions. Real-time clock is mainly to provide accurate information system, therefore the time in the power source of the circumstances, disconnect the timing,this system can continue to provide the 3.6 V rechar
17、geable batteries as its backup power, to provide uninterrupted time.V oice prompt unit used to provide good human-machine interface, with voice to prompt the user to correct operation. The company adopts ISD1420 is ISD access technology integration can be simulated repeatedly recording 20 seconds of
18、f the pronunciation chip, phonetic pronunciation is not lost, electric, maximum points each segment of 160 minimum length of speech, each section for 125 ms speech can be controlled by address lines, each output for an address, 125 ms by AO - A7 eight root address line control. Users of the voice re
19、cording each segment with period after ending sign automatic chip EOM (after), chip has recorded a logo (AIDS), OVF ISD1420 is informationUsing this function, cable function can not know the exact address for voice, control the use of pulse triggering to need time playback.3. Unlock control circuitD
20、ue to the general electronic locks are used to control the low level, in order to avoid the lock on the door direct access to the machine used to drive electric low level, improve safety lock, by a single unit control circuit, control from its hardware and MCU control actuator two parts. Installed i
21、n the door lock control circuit, when the SCM control commands from control, lock chip receives the command and decoding, if correct, drive actuators to unlock. Actuators by mosfet and solid state relays.4.Other functional unitLCD display unit adopts 128*32 matrix LCD display 16*16 dot matrix charac
22、ters, 1 eight characters displayed row. LCD display time for information and function of the system and menu for information. Used to store extended deposit reservoir of users open records and failure information. System adopts two 24LC256 expanded 64k memory space, can save more than 9,000 records.
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