RU198365U1 - DEVICE FOR LOW-FLYING UNMANNED AERIAL VEHICLES - Google Patents

Abstract

The utility model relates to air defense. The device for the destruction of low-flying unmanned aerial vehicles contains a fragmentation warhead of directed destruction, a block for its detonation and a passive acoustic target sensor. At the same time, an active radar target recognition sensor, with a range selector, as well as a coincidence circuit, which detonates the warhead, are introduced into the device. The technical result of the utility model is to ensure the reliability of destruction of small air targets (unmanned aerial vehicles of the micro class) at extremely low altitudes, in any weather conditions. 1 ill.

Description

The utility model relates to air defense, and more specifically, to a device for the destruction of low-flying unmanned aerial vehicles of class micro [1].

Known anti-aircraft missile systems are designed to hit air targets, but the disadvantage of these technical means is the low efficiency in hitting small-sized low-flying targets [2]. First of all, unmanned aerial vehicles at altitudes of less than 50-100 m. [3].

The closest in technical essence is the anti-helicopter mine "Boomerang" [4]. It is designed to hit air targets with a high-speed strike core, at a range of up to 150 m. This anti-helicopter mine using a passive acoustic system detects the target, turns the warhead towards the target and scans with the help of an optical multi-frequency passive IR sensor, determines the true direction to the target and the moment of undermining the warhead.

The disadvantage of this tool is the impossibility of hitting small-sized air targets with a low level of their own acoustic and thermal radiation, which include unmanned aerial vehicles. It is difficult to detect such targets in adverse weather conditions (heavy snow, rain) due to large losses of thermal IR radiation during propagation from the target.

The technical result of the utility model is to ensure the reliability of destruction of small-sized air targets (unmanned aerial vehicles of the micro class) at extremely low altitudes, in any weather conditions, that is, where known air defense systems are not effective.

The stated technical result is achieved by the fact that an all-weather radar sensor is introduced into the defeat device in the recognition mode of air targets having rotating screws (propulsors). At the same time, the passive (low power consumption of the power source) acoustic sensor works in a constant standby mode. Its sensitivity is maximum in order to detect a low-noise unmanned aerial vehicle, therefore it is exposed to false acoustic signals (interference) of various origins. However, when it is triggered, the active (significantly energy-consuming) radar sensor, which detects (the presence of) “helical” amplitude modulation from a low-flying UAV, is activated for a short time. The occurrence of this effect is due to the parametric effect when the microwave electromagnetic field is reflected from a rotating screw [5].

The low-frequency signal caused by the “helical” amplitude modulation is also present in the spectrum of the acoustic field created by the rotating screw. Its frequency spectrum is also determined by the number of rotations of the screw [6]. The presence of correlation is recorded due to the introduction into the device of the defeat of the coincidence scheme of low-frequency signals, parametric "helical" modulation from the outputs of the acoustic sensor and low-frequency radar sensor.

Interference from large flying objects with large EPR (helicopters, airplanes, etc.) is eliminated by introducing a range selector into the radar sensor [7]. It excludes the sensor from triggering objects flying at altitudes of more than 50-100 m.

Figure 1 shows a block diagram of a device for hitting low-flying UAVs (1). The device contains a passive acoustic sensor (2), an all-weather radar sensor (3), a radar sensor range selector (4), a coincidence circuit (5), a warhead detonation unit (6), and a fragmentation warhead of a directional destruction (7).

The defeat device low-flying unmanned aerial vehicles operates as follows. The acoustic signal from the low-flying target of an unmanned aerial vehicle (1) is received by a passive acoustic sensor (2). Its operation causes a short-term inclusion of the radar sensor (3), in target recognition mode. In this case, the range selector (4) excludes its response to remote targets (more than 50-100 m.). Low-frequency signals from the outputs of the acoustic sensor (2) and the radar sensor (3) are fed to the inputs of the coincidence circuit (correlator) (5). They coincide (since they are formed by one rotating screw from the target) and the coincidence pattern is triggered. The control signal from its output activates the blasting unit (6), if it is not blocked in advance by a signal from the range selector (4), which detonates the fragmentation warhead (7). Its fragments are thrown up towards the target (1) and hit it.

List of references

1. G.N. Shcherbakov, Yu.A. Shlykov. Protecting important ground targets from air terrorism. Special equipment, 2007, No. 1, p. 17-22.

2. F.K. Neupokoev. Shooting anti-aircraft missiles. M., Military Publishing House of the Ministry of Defense of the USSR, 1980, p. 246-250.

3. Organization of a system to combat small UAVs. Arsenal of the Fatherland, No. 6 (14), 2014

4. O.V. Walecki. Mine weapons. M., "Kraft", 2009, p. 193-194.

5. V.G. Nebabin, V.V. Sergeev. Methods and techniques of radar recognition. 2.2. A method for target recognition by the modulation effects of turbines and noise modulation of the reflected signal. M., Radio and communications. 1984, p. 32-37.

6. A.A. Bombizov et al. Study of electromagnetic and acoustic radiation of unmanned aerial vehicles in the low-frequency region. Reports of TU SUR, Tomsk, 2018, volume 21, No. 1, p. 5 7-61.

7. M.I. Fallenstein. Basics of radar. Chapter 8. Automatic measurement of target coordinates. M., 1973, with. 374-402.

Claims (1)

A device for hitting low-flying unmanned aerial vehicles containing a fragmentation warhead of a directional defeat, a blasting unit and a passive acoustic target sensor, characterized in that an active radar target recognition sensor with a range selector is inserted into the device, as well as a coincidence circuit that performs warhead detonation.

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