METHOD OF SUBJECT IDENTIFICATION ON SERVICED FACILITY Russian patent published in 2011 - IPC E05B39/00 

FIELD: construction.

SUBSTANCE: method to identify a subject on a serviced facility is based on approaching or contact of an authorised access device installed at the facility and a smart key that reads information from the specified device. The device of access authorisation at the facility is an identifier with an individual code that operates in the "query-response" mode. The smart key is made on the basis of a GSM-modem with a SIM-card and an individual number, comprises a microcontroller arranged as capable of reading the individual number of the SIM-card and the inidividual code of the identifier. The method includes transfer of the specified codes in the form of a reference code information to a dispatcher centre that makes decision on validity or invalidity of the obtained information. In the first case the subject receives a light signal to a light diode of the smart key, and in the second one - the process of identification is repeated. The identifier with an individual code is arranged in the form of a piezocrystal with a thin-film aluminium interdigital transducer applied on its surface, which comprises two comb-shaped systems of electrodes that are connected to each other by means of buses, a set of reflectors and a microstrip antenna. High-frequency probing oscillation is generated at the carrier frequency ω₁ to radiate the identifier. High-frequency probing oscillation is caught with the microstrip antenna of the identifier, converted into an acoustic wave, propagation of which is ensured along the surface of the piezocrystal, as well as reverse reflection. The reflected acoustic wave is converted into an electromagnetic signal with phase manipulation, the inner structure of which is determined by the structure of the interdigital transducer and complies with the individual code, which is radiated on the air at the frequency of ω₁ and caught by a transceiving antenna of the reader. Synchronous detection of an electromagnetic signal is carried out with phase manipulation using high-frequency probing oscillation at the frequency ω₁ as the reference voltage. Low-frequency voltage is extracted, which is proportional to the individual code, and it is sent to the microcontroller. Using a microcontroller, a reference code information is generated, a phase of the high-frequency probing oscillation is doubled, harmonic oscillation is extracted with frequency of ω₂=2ω₁, it is manipulated by phase with the reference code information, thus forming a complex signal with phase manipulation, which is radiated on the air at the frequency ω₂ and caught by a transceiving antenna of a dispatcher's centre. Synchronous detection of a complex signal is carried out with phase manipulation using harmonic oscillation at the frequency ω₂ as the reference voltage. Low-frequency voltage is extracted, which is proportional to the reference code information. Code information is verified with the help of a computer. If the reference code information is valid, the produced information is decoded with specification of the facility name and identity of the subject, which obtains access. An individual code of the subject is generated. The phase of harmonic oscillation is doubled at the frequency ω₂. The harmonic oscillation is extracted with the frequency ω₃=2ω₂, it is manipulated by phase with an individual code of the subject, thus forming a complex signal with phase manipulation, which is radiated on the air at the frequency of ω₃ and caught by the transceiving antenna of the smart key. Synchronous detection of a complex signal is carried out with phase manipulation using harmonic oscillation at the frequency ω₃ as the reference voltage. Low-frequency voltage is extracted, which is proportional to the individual code of the subject, and it is sent to the microcontroller.

EFFECT: increased efficiency of the method to identify the subject at the serviced facility.

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