METHOD OF EARLY FIRE DETECTION AND DEVICE FOR IMPLEMENTING METHOD Russian patent published in 2014 - IPC G08B17/117 

FIELD: radio engineering, communication.

SUBSTANCE: system for implementing the method contains gas sensors, coupling amplifiers, ADC, a microprocessor, an audiovisual alarm generator, a visual alarm annunciator, an audio alarm annuciator, a generator output, a modulating code generator, a master generator, a phase-shift modulator, a power amplifier and a transmitting antenna. The device for receiving complex phase-shift keying signals contains a receiving antenna, a high frequency amplifier, a heterodyne, mixers, an intermediate frequency amplifier, a phase-splitting circuit, a phase doubler, a phase shifter to +90°, a phase detector, a logging unit, a summation unit, amplitude detectors, keys, processing units.

EFFECT: operating frequency range expansion without expanding the range of the heterodyne frequency readjustment due to the usage of image and combined channels.

2 cl, 7 dwg