Self-adaptive passive interference dispensing equipment and dispensing method applied to unmanned aerial vehicle

Abstract

The invention belongs to the field of radar passive interference, and particularly relates to self-adaptive passive interference dispensing equipment and a dispensing method applied to an unmanned aerial vehicle. According to the method, the chaff aiming at the radar emission frequency is adaptively generated through radar frequency reconnaissance in advance, effective passive interference can be generated on radar detection, the problem that the interference efficiency is low due to the fact that the size of the prefabricated chaff in a traditional chaff bomb is not consistent can be solved, and the battlefield viability of the unmanned aerial vehicle is improved.

Description

Technical Field

[0001] The present invention belongs to the field of passive interference, and particularly relates to an adaptive passive interference spreading device and a spreading method applied to unmanned aerial vehicles. Background Art

[0002] Since the 21st century, drones have made continuous progress in payload miniaturization, endurance, beyond-visual-range communications, and low costs. The combat missions of drones will be expanded from the current simple tasks of short-range intelligence reconnaissance, target positioning and indication, communication relay, and electronic warfare to high-confrontation environments such as beyond-visual-range reconnaissance and surveillance, air defense suppression, coordinated attacks, and anti-access / area denial. Countries have also increased their investment in the development of a variety of special anti-drone systems represented by anti-drone radars. The low radar cross-section (RCS) that drones used to survive on the battlefield is no longer sufficient to provide effective protection, causing the combat loss rate of drones to rise rapidly in many regional conflicts.

[0003] Currently, active jammers are difficult to load and use due to the weak power supply capacity of drones. Although traditional chaff jammers (passive jammers) can also provide protection for drones, they have the following disadvantages: First, the interference time is short, because chaff bombs use pyrotechnics to spread chaff in the air, and the process is a one-time spreading process. Although it has the advantage of a large amount of chaff released, the protection time is short. If multiple chaff bombs are fired at intervals, the weight is too large to affect the flight of the drone. Second, the interference efficiency is low, because the chaff in the jammer is prefabricated, its size cannot be adaptively changed according to the current radar frequency, resulting in low interference efficiency. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an adaptive passive jamming spreading device and spreading method for unmanned aerial vehicles. The present invention adaptively generates chaff for radar transmission frequency through pre-detection of radar frequency, which can produce effective passive jamming for radar detection, avoid the problem of low jamming efficiency caused by inconsistency of size of prefabricated chaff in traditional chaff bombs, and improve the battlefield survivability of unmanned aerial vehicles.

[0005] The technical solution of the present invention is: an adaptive passive jamming spreading method applied to a UAV, characterized in that it comprises the following steps:

[0006] Step 1: Detect threatening radar signals through radar frequency reconnaissance equipment and record the radar signal operating frequency f;

[0007] Step 2: Calculate the radar wavelength λ according to the radar signal operating frequency f. The controller sends a control signal to drive the feeding mechanism to pull out the foil strips from the foil strip roll and drive the cutter to cut the interference foil strips. 1 Make the foil strip size L an integer multiple of half the wavelength of the radar signal frequency;

[0008] Step 3: Spread the cut interference foil strips into the air through the airflow ejector.

[0009] According to the adaptive passive jamming spreading method applied to UAV as described above, it is characterized in that the foil strips are one or more of aluminum foil strips, aluminum-coated glass fibers or silver-coated nylon fibers.

[0010] According to the adaptive passive jamming spreading method applied to UAV as described above, it is characterized in that the foil strip size L is between 0.5 and 3 cm.

[0011] The present invention also discloses an adaptive passive interference spreading device applied to unmanned aerial vehicles, comprising a radar signal reconnaissance device, a controller, a foil strip roll, a feeding mechanism, and an airflow ejector; the radar signal reconnaissance device is connected to the controller, and is characterized in that: the radar signal reconnaissance device is used to detect radar signals, the controller is connected to the feeding mechanism and the cutter, the foil strip roll is placed on one side of the feeding port of the feeding mechanism, the airflow ejector is arranged on the discharge side of the feeding mechanism, a cutter is arranged in the middle of the feeding mechanism, and the controller controls the operation of the feeding mechanism and the cutter.

[0012] According to the adaptive passive jamming dispersing device applied to UAV as described above, it is characterized in that: the controller calculates the radar wavelength λ based on the radar signal reconnaissance equipment, and the controller controls the feeding mechanism and the operation of the tool to make the cut foil strip half of the radar wavelength λ.

[0013] According to the adaptive passive jamming spreading device applied to UAV as described above, it is characterized in that the airflow source of the airflow ejector is a high-speed fan or the exhaust gas of the UAV engine.

[0014] The beneficial effects of the present invention are as follows: by controlling the speed of the feeding mechanism and the cutting frequency of the tool, the size of the generated foil strip is always maintained at an integral multiple of the half wavelength of the current radar detection signal frequency, thereby improving the interference effect and avoiding the problem of low interference efficiency caused by the mismatch of the size of the prefabricated foil strips in traditional jamming bombs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the present invention.

[0016] Figure 2 This is the system schematic diagram. DETAILED DESCRIPTION

[0017] The present invention is further described below with reference to the accompanying drawings and examples.

[0018] like Figure 1 As shown, an adaptive passive jamming spreading method applied to a UAV of the present invention comprises the following steps:

[0019] Step 1: Detect threatening radar signals through radar frequency reconnaissance equipment and record the radar signal operating frequency f;

[0020] Step 2: Calculate the radar wavelength λ according to the radar signal operating frequency f (the calculation formula is λ = C / f where C is the speed of light). The controller sends a control signal to drive the feeding mechanism to pull out the foil strips from the foil strip roll and drive the cutter to cut the interference foil strips. By controlling the feeding speed V and the cutter cutting frequency f 1 Make the foil strip size L (L is the foil strip length, calculated by the formula L = 0.5*V / f 1 ) is an integer multiple of half the wavelength of the radar signal frequency and is used to detect small UAVs (RCS less than 0.1m 2 ) radar, the half-wavelength range of its signal is generally between 0.5 and 3 cm;

[0021] Step 3: Spread the cut interference foil strips into the air through the airflow ejector to interfere with the radar's detection process of the target.

[0022] In order to ensure that the foil strips spread by airflow have sufficient hovering time and electromagnetic wave scattering ability, the foil strips can be made of lightweight and highly conductive materials such as aluminum foil strips, aluminum-coated glass fibers, and silver-coated nylon fibers. Such materials have collimation properties and are convenient for airflow-induced spreading after cutting (if the half-wavelength of the radar signal is ≤1cm, it is recommended that the foil strip roll use aluminum foil strips with a width of 1cm).

[0023] This equipment can flexibly adjust the density of interference foil strips. If the density of interference foil strips needs to be increased, the feeding speed V and the cutting frequency f of the tool in step 2 can be increased in the same proportion. 1 .

[0024] like Figure 2 As shown, an adaptive passive jamming spreading device applied to unmanned aerial vehicles includes a radar signal reconnaissance device, a controller, a foil strip roll, a feeding mechanism, and an airflow ejector; the radar signal reconnaissance device is connected to the controller, the radar signal reconnaissance device is used to detect radar signals, the controller is connected to the feeding mechanism and the cutter, the foil strip roll is placed on one side of the feeding port of the feeding mechanism, the airflow ejector is arranged on the discharge side of the feeding mechanism, a cutter is arranged in the middle of the feeding mechanism, and the controller controls the feeding mechanism and the cutter to operate. The controller calculates the radar wavelength λ according to the radar signal reconnaissance device, and the controller controls the feeding mechanism and the cutter to operate so that the cut foil strip is half of the radar wavelength λ.

[0025] The source of the high-speed airflow of the air ejector can be a high-speed fan or high-temperature exhaust gas from a UAV engine.

[0026] The present invention manufactures interference foil strips according to the frequency of real-time radar detection signals, avoids interference failure caused by radar frequency conversion, improves the interference effect, and avoids the problem of low interference efficiency caused by inconsistency of prefabricated foil strip sizes in traditional interference bombs.

Claims

1. An adaptive passive jamming method for UAVs, Features: The following steps are involved: Step 1: Detect threatening radar signals through radar frequency reconnaissance equipment and record the radar signal operating frequency f; Step 2: Calculate the radar wavelength λ according to the radar signal operating frequency f. The controller sends a control signal to drive the feeding mechanism to pull out the foil strips from the foil strip roll and drive the cutter to cut the interference foil strips. 1 Make the foil strip size L an integer multiple of half the wavelength of the radar signal frequency; Step 3: Spread the cut interference foil strips into the air through the airflow ejector.

2. According to claim 1, an adaptive passive jamming spreading method applied to a UAV, Features: The foil strips are one or more of aluminum foil strips, aluminum-coated glass fibers or silver-coated nylon fibers.

3. According to claim 1, an adaptive passive jamming spreading method applied to a UAV, Features: The foil strip size L is between 0.5 and 3 cm.

4. An adaptive passive jamming dispersing device for unmanned aerial vehicles, comprising a radar signal reconnaissance device, a controller, a foil roll, a feeding mechanism, and an airflow ejector; the radar signal reconnaissance device is connected to the controller, Features: The radar signal reconnaissance equipment is used to detect radar signals. The controller is connected to the feeding mechanism and the cutter. The foil strip roll is placed on the feed port side of the feeding mechanism. The air flow ejector is arranged on the discharge side of the feeding mechanism. The cutter is arranged in the middle of the feeding mechanism. The controller controls the operation of the feeding mechanism and the cutter.

5. The adaptive passive jamming distribution device for unmanned aerial vehicles according to claim 4, Features: The controller calculates the radar wavelength λ according to the radar signal reconnaissance equipment, and controls the feeding mechanism and the operation of the cutter to make the cut foil strip half of the radar wavelength λ.

6. The adaptive passive jamming distribution device for unmanned aerial vehicles according to claim 4, Features: The airflow source of the air ejector is a high-speed fan or the exhaust gas of the UAV engine.

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