RU2069013C1 - Device of warning signal system for detection of intrusion into guarded room - Google Patents

Abstract

FIELD: signalization devices. SUBSTANCE: device of warning signal system is related to equipment warning about burglary. Device incorporates superregenerator used in the capacity of transceiver, digital frequency-phase detector, controlled low-frequency generator and digital phase integrator. Signal from output of digital phase integrator controls operations of alarm signal former. EFFECT: design of device of warning signal system capable of high sensitivity for detection of slowly moving objects with low-level inherent radiation. 1 dwg

Description

 The proposed device relates to alarm systems, in particular, to devices that give an alarm when the intruder is exposed to an emitted electromagnetic field.

 Known alarm devices containing antennas, a receiver and a transmitter in which detection of intrusion into a secure room is carried out by determining the Doppler frequency shift of the emitted signal detected by the receiving device / 1 /.

 There are also known devices for burglar alarms containing antennas, a transmitter and a receiver, in which intrusion detection is carried out by determining the level change of signals received by the receiving device during an invasion of a guarded room / 2 /.

 A disadvantage of the known devices is their complexity and a high level of transmitter radiation power.

 The closest technical solution to the invention is an automatic burglar alarm system / 3 /. The disadvantages of the prototype include the complexity of the device due to the use of separate receiving and transmitting devices, as well as the need for galvanic communication between the receiving and transmitting devices.

 The aim of the present invention is to provide a security alarm device having high sensitivity, including when detecting slowly moving objects, and a low level of intrinsic radiation.

 This goal is achieved by using a super-regenerator as a transmitter / receiver, using a digital frequency-phase detector and a digital phase integrator to process the received signal.

 The structural diagram of the proposed device is shown in the drawing.

 The device comprises an antenna 1 connected to a transceiver device 2, a digital frequency-phase detector 3, a controlled low-frequency generator 4, a digital phase integrator 5 and an alarm driver 6.

 The device operates as follows: the antenna 1 connected to the transceiver 2 emits a high-frequency signal of the super-generator, which, being reflected from objects in the protected area, again goes to the antenna 1 and then to the transceiver 2. The radiation of the super-generator, which is, as a rule, spurious, here Used as a received signal. In this case, the extinction frequency of the super-regenerator assumes a certain value, determined by the level of the received signal. From the low-frequency output of the transceiver 2, a signal with a blanking frequency is supplied to one of the inputs of the digital frequency-phase detector 3. The second input of the digital frequency-phase detector 3 receives a signal from the output of a controlled low-frequency generator 4, whose frequency is controlled by the action of an error signal from the output 1 frequency-phase detector 3.

 In the absence of changes in the environment in the protected area during the time determined by the duration of the transient processes in the device, the quenching frequency of the super-generator of the transceiver 2 is stabilized, and the frequency of the controlled low-frequency generator 5 becomes equal to the quenching frequency of the super-generator (while the device is ready for operation). When an intruder appears in the protected area, the signal emitted by the antenna 1 is reflected from the intruder and through the antenna 1 is fed to the input of the transceiver 2, which leads to a change in the extinction frequency of the super-generator. At the same time, pulses arriving at the digital phase integrator 5 appear at the output 2 of the digital frequency-phase detector 3. If during the time determined by the time constant of the digital phase integrator 5, the phase of the quenching pulses of the super-generator and the controlled low-frequency generator 4 will not be aligned (which indicates a short-term random change in the blanking frequency or the frequency of the controlled generator), the output of the integrator 5 will receive a signal that controls the inclusion of the shaper of the alarm 6.

Claims (1)

 A security alarm device for detecting an intrusion into a secure room containing an antenna connected to a transceiver, the output of which is connected to a signal processing unit, the output of the signal processing unit is connected to an alarm driver, characterized in that the signal processing unit is made on a digital frequency-phase detector, controlled low-frequency generator and digital phase integrator, the transceiver is made on a super-generator connected to the input and output with the antenna, low-frequency One superregenerator is connected to the first input of the digital frequency-phase detector, the second input of the digital frequency-phase detector and the first input of the digital phase integrator are connected to the output of the controlled low-frequency generator, the control input of which is connected to the first output of the digital frequency-phase detector, the second output of which is connected to the second input of the digital phase integrator, the output of which is the output of the signal processing unit and connected to the input of the alarm driver.