RU184800U1 - Detector of radio-controlled fragmentation explosive devices - Google Patents

Abstract

The utility model relates to the field of combating terrorism and can be used to safely identify radio-controlled explosive devices. The technical result of the utility model is to provide a safe process for the detection of radio-controlled explosive devices using "non-linear" radars. The technical result is achieved by introducing an autonomous radio-trailing unit into the microwave detector. The unit includes three microwave transmitters imitating the probing signals of the detector transmitters. Each of these transmitters is capable of causing an explosion of a radio-controlled explosive device. To ensure electromagnetic compatibility, the carrier frequencies of the first two transmitters of the radio-trailing unit are taken at least 5% different from the carrier frequencies of microwave transmitters of a nonlinear radar. The carrier frequency of the third microwave transmitter of the radio-trailing unit is taken to be equal to the carrier frequency of the microwave transmitter transmitter of the “exciting” plasma breakdown in the search objects. In this case, the output powers of all three microwave transmitters of the radio-trailing unit are taken more than the transmitters of the detector. The radio-targeting area is carried forward a safe distance, measured in tens of meters. 1 ill.

Description

The utility model relates to the field of combating terrorism and can be used to safely identify radio-controlled explosive devices.

Known portable radars of subsurface sounding, designed to detect masked explosive devices [1]. The disadvantage of such devices is the short detection range of 0.5-1-2 m and a large number of false positives from inhomogeneities of the masking layer of soil, vegetation or snow, which reduces the search rate [2].

Known means of detection based on the multi-frequency nonlinear radar method using the effect of plasma breakdown in metal contacts [3, 4]. These tools are designed for sustainable remote detection of radio-controlled explosive devices at a distance of several meters to 10-12 meters.

The use of these funds is limited by their low safety. This is due to the possibility of spontaneous undermining of a radio-controlled explosive device under the influence of a sounding multi-frequency microwave signal from this tool.

The technical result of the utility model is to provide a safe process for the detection of radio-controlled explosive devices using "non-linear" radars.

The technical result is achieved by introducing an autonomous radio-trailing unit into the microwave detector. The unit includes three microwave transmitters imitating the probing signals of the detector transmitters. Each of these transmitters is capable of causing an explosion of a radio-controlled explosive device. To ensure electromagnetic compatibility, the carrier frequencies of the first two transmitters of the radio-trailing unit are taken at least 5% different from the carrier frequencies of microwave transmitters of a nonlinear radar. The carrier frequency of the third microwave transmitter of the radio-trailing unit is taken to be equal to the carrier frequency of the microwave transmitter transmitter of the “exciting” plasma breakdown in the search objects. In this case, the output powers of all three microwave transmitters of the radio-trailing unit are taken more than the transmitters of the detector. The radio-irradiation zone is carried forward to a safe distance, measured in tens of meters [5].

The drawing (Fig. 1) shows a structural diagram of a detector for radio-controlled fragmentation explosive devices.

The detector (1) containing a nonlinear two-frequency radar (2), containing a powerful pulsed microwave generator (3), a microwave generator of probing signals (4) and (5), as well as a combination frequency receiver (6). The detector includes a radio-trailing unit (7), which includes microwave generators (8), (9) and (10). In this case, the generators (8) and (9) simulate microwave sounding signals from the microwave search generators (4) and (5), and the generator (10), respectively, the pulse generator (3)

The detector radio-controlled fragmentation explosive devices operates as follows. The radio-controlled fragmentation device (11), falling into the irradiation zone (12), is detonated at a safe distance from the detector (1), which includes a two-frequency nonlinear radar (2). If there is no detonation, the radio-controlled fragmentation device (11) will be further detected in the detection zone (13) of the nonlinear radar (2), which is part of the detector (1).

In order to confirm the possibility of obtaining the claimed technical result, a qualitative experiment was performed. A Kenwood TK-278 (1) radio station with a makeshift "explosive" trigger connected to the low-frequency output of a radio station 2 × 3 × 8 cm in size was used as a mock fragmentation radio-controlled device. The trigger device used a detector with two KD522 V diodes and an electronic key on the transistor KT819V. A low-voltage miniature incandescent lamp from a flashlight was used as a simulator of an electric detonator, fragmentation elements (nails, cuttings of fittings, wire, etc.) were located in a plastic container with dimensions of 20 × 35 × 5 cm.

The layout of the dual-frequency radar included microwave generators G3-21, G4-121 (P _a = 0.5 W), an SMV receiver 8.5 and P5-5B. The antenna gain was 10. The signals 1300 and 1150 MHz were emitted, and 1000 MHz (the third order Raman frequency) and 2450 MHz (the second order Raman frequency) were received. The power flux density of the probing microwave fields was measured with a P3-19 instrument. The source of the microwave signal exciting the plasma breakdown in metal search objects was the portable radar transmitter NR-900EK Korshun P _imp = 180 W, pulse duration τ _u = 2 μs, F = 845 MHz. A prototype fragmentation explosive device was confidently detected using a prototype of a two-frequency radar, and the use of an additional third microwave radiation, causing a plasma breakdown in the metal contacts of the search object, increased the detection range by 2 .3 times (up to 3 meters).

When the prototype of the radio-controlled fragmentation explosive device was brought to a distance of less than 1 meter to the model of the nonlinear radar station (NLRS), its "self-detonation" was observed (the incandescent light came on). This confirms the possibility of "self-detonation" of the explosive device from the probing signal and confirms the need to introduce an additional microwave three-frequency radio trailing unit in the detector.

Information sources:

1. Issues of subsurface radar. Edited by A.Yu. Grinev. M. "Radio Engineering", 2005, p. 191-195.

2. Raisins and others. Theory and methods of georadar. M. "Mountain Book", 2008, p. 82-105.

3. Scherbakov G.N. et al. RF Patent No. 178956 with a priority dated January 12, 2018.

4. Scherbakov G.N. Detection of hidden objects. M. "Arbat - Inform", 2004, p. 57-82.

5. Ivlev S.A., Scherbakov G.N. etc. Search and disposal of explosive devices. M. Foundation for Economic Literacy, 1996, p. 4-7.

Claims (1)

A detector of radio-controlled fragmentation explosive devices containing two microwave transmitters, a receiver of combinational components in the spectrum of the reflected signal and a powerful pulsed microwave transmitter that excites a plasma breakdown in the metal contacts of the search object, characterized in that an autonomous radio-blocking unit is included in it, including two microwave transmitters with an output power greater than the first two microwave transmitters and carrier frequencies differing by at least 5% from the carrier frequencies of these transmitters, as well as a powerful imp a microwave transmitter on the frequency of the third exciting microwave transmitter with no less power than it, while the microwave autonomous radio-trailing unit is located at a safe distance from the detector

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