RU2210813C2

RU2210813C2 - Device for burglar and fire alarm

Info

Publication number: RU2210813C2
Application number: RU2001104400A
Authority: RU
Inventors: В.А. Заренков; Д.В. Заренков; В.И. Дикарев
Original assignee: Заренков Вячеслав Адамович; Заренков Дмитрий Вячеславович; Дикарев Виктор Иванович
Priority date: 2001-02-12
Filing date: 2001-02-12
Publication date: 2003-08-20

Abstract

FIELD: detection of violator or fire breeding ground at controlled objects with transmission of alarm messages over radio channel. SUBSTANCE: each controlled post is assigned its address code and each type of information is given its own information code. Controlled object has alarm sensors, coding unit with switch of signal repetition period, signal duration selector, address coding unit and transmitter with phase manipulator. Receiving post includes signal processing and demodulation unit with phase detector, units decoding address and information and unit identifying false operation. Usage of phase-manipulated signals ensures high secretiveness of transmitted signals with wide range of change of transmitted messages. EFFECT: increased noise immunity and authenticity of alarm signals transmitted to receiving post. 5 dwg

Description

Текст описания в факсимильном виде (см. чертежи) Т Description text in facsimile form (see drawings) T

Claims

A device for burglar and fire alarms, comprising, at each monitored object, alarm sensors in series, an information encoding unit, a signal period switch, the other two inputs of which are connected to the outputs of a signal period generator, an address encoding unit, an encoder, the second input of which is connected to the second the output of the information encoding unit, and a transmitter connected via sequentially connected signal duration selector and an electronic key with the output the follower of the signal repetition period and through a communication line with a receiver containing a decoder, the input of which is connected to the output of the processing and demodulation unit, the first output of the decoder is connected to the input of the address decoding unit, the outputs connected to the first inputs of the switch, the first outputs connected to the information storage devices, the outputs which are connected to the indicator, while the outputs of the address decoding unit are connected to the inputs of the signal coincidence detection unit in time, the output of which is connected to the first input the ban lock connected to the output of the false message detection unit, the inputs of which are connected to the outputs of the information decoding unit and the second inputs of the switch, the input of the information decoding unit is connected to the second output of the decoder, the output of the information recording prohibition unit is connected to the third input of the switch, the second outputs of which are connected to the inputs of the blocks detecting message skipping, the outputs of which are connected to the indicator, characterized in that the transmitter is made in the form of series-connected generator in high frequency of, the phase manipulator, a second input coupled to an output of the encoder, and the power amplifier, wherein the high frequency generator is designed for supplying a high-frequency oscillation from its output in the form of
Uc (t) = VcCos (Wc • t + φc),
wherein 0≤t≤Tc,
where Uc is the amplitude;
Wc is the carrier frequency;
φс is the initial phase;
Tc - the duration of the transmitter signal,
the signal processing and demodulation unit is made in the form of a first mixer connected in series to the output of the receiving antenna, the second input of which is connected to the first output of the local oscillator, the first intermediate-frequency amplifier, adder, multiplier, the second input of which is connected to the output of the receiving antenna, the first narrow-band filter, and amplitude detector , a key, the second input of which is connected to the output of the adder, phase doubler, second narrow-band filter, phase divider into two, frequency detector, trigger, balanced lane breakers, a second input coupled to an output divider phase two and phase detector, a second input coupled to an output key, and an output connected to the decoder input and to the output of the receiving antenna connected in series with a second mixer, the second input thereof via a first phase shifter 90 ^o connected to the second output of the local oscillator, a second intermediate frequency amplifier and a second phase shifter 90 ^o , the output of which is connected to the second input of the adder.