| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: invention relates to authentication and monitoring movement of a product. A reader comprises a driving generator 1, a duplexer 2, a transceiving antenna 3, a high frequency amplifier 4, a phase detector 5, an identification code database 6, a code comparison unit 7, a switch 8, a delay line 9, a pseudo-random sequence generator 10, an adder 11, a multiplier 12, a narrow band-pass filter 13, a phase-shift modulator 14 and a power amplifier 15. A radio-frequency tag comprises a piezoelectric crystal 16, a microstrip antenna 17, electrodes 18, buses 19 and 20 and a set 21 of reflectors. Receiving equipment of the manufacturer comprises a receiving antenna 22, a high frequency amplifier 23, universal composite frequency-modulated signal demodulators 24 and 39, multipliers 25, 26, 40 and 41, narrow band-pass filters 27 and 43, low frequency filters 28 and 42, a manufacturer database 29, heterodynes 30 and 31, mixers 32 and 33, intermediate frequency amplifiers 34 and 35, a correlator 36, a threshold unit 37, a switch 38, phase inverters 44 and 45 and a subtraction unit 46.EFFECT: high noise-immunity and range of action.2 cl, 4 dwg |
