REMOTELY SET RADIO-FREQUENCY ANNUNCIATOR AND METHOD OF USE THEREOF Russian patent published in 2020 - IPC G01S17/58 

FIELD: physics.

SUBSTANCE: remotely installed radio-wave annunciator refers to technical means of protection, in particular, to means of intruder alarm. Invention is intended for use in object security system for detecting moving intruder based on Doppler effect. Operation of the Doppler radio wave detector consists in generation of a signal of a certain frequency by the signal generator, which simultaneously arrives at the mixer and through the transmitter into the space for formation of the detection zone. Upon falling into the intruder detection zone, the signal reflected therefrom with a changed frequency through the receiver falls on a mixer which compares both signals, and, when detecting frequency difference, through band pass filter is supplied for further processing and generating alarm signal. Detector remote installation is carried out using lift-free pilotless aircraft of helicopter type. Detector is placed in a special sealed dust and waterproof cylindrical housing, which is equipped with a stabilization device, which is spring-loaded tabs attached to the housing sides and connected to each other by strong capron mesh material.

EFFECT: such design of the detector makes it possible to install it remotely by means of a drone aircraft and to use it for the purpose on snow-covered or grassy surface.

2 cl, 4 dwg