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Analysis of automatic radio-controlled systems of the control of the access

Keywords:

S.Yu. Deulin – Undergraduate, Department «Design and Technology of Electronic Devices», Bauman Moscow State Technical University
E-mail: zmono@mail.ru
L.V. Zhuravlyova – Ph. D. (Eng.), Associate Professor, Department «Design and Technology of Electronic Devices», Bauman Moscow State Technical University
E-mail: fogel09@mail.ru


This article provides a review of the problems of automatic radio-controlled systems of the control of the access used to control the access to the infrastructure of private homeownership, homeowners’ associations, etc. These systems limit access of strangers and vehicles to controlled territory. Modern barriers and gates have electronic control units, which give an opportunity for remote control. In such cases an existence of receiver is expected in the electronic control unit.
All kinds of the systems of radio control of barriers and automatic gates take to a receiver a signal in the form of a sequence of exact number of impulses transferred by the transmitter of remote controller. The method of signal transmission in the form of consecutive pulses is called sequential code. A receiver sends the accepted signal to a converter that converts sequential code into parallel. Then from the converter code enters the decoder, which determines the correctness of the code, and If it is correct, it gives a signal to controls to open or close, and if the code is incorrect - just ignores it.
The most common processing algorithm is code’s modifying after each keystroke of the keychain. Each keychain is unique and it’s copy isn’t foresaw by this technology, but within one system keychains codes are identical. Every keychain connected directly with signal receiver. Systems with dynamic code have limited number of stored keychain, but they are the safest. There are also systems with interactive code, but to the barriers and gates they are used extremely seldom. They have found their application in the field of automobile security systems.
According to the results of the research of the automatic radio controlled systems of the control of the access, in the work was developed a conception of realization of a system of the access with frequency adaptation. By comparing the sensitivity transceivers of different manufacturers it takes into consideration the condition of changes of this sensitivity: BER/PER. In practice the difference between the sensitivity measured at BER and PER reaches about 3 dB.
The concept proposed in the work allows to realize a universal modular unit for authorization for automatic radio-controlled systems of the control of the access.

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