阅读说明：本技术 基于电磁围栏技术的无人机防御系统 (Unmanned aerial vehicle defense system based on electromagnetic fence technology ) 是由 段章山 于 2020-06-10 设计创作，主要内容包括：本发明公开了基于电磁围栏技术的无人机防御系统,涉及无人机防御技术领域,尤其是一种基于电磁围栏技术的无人机防御系统,其包括：信号发生单元、功率放大单元以及电磁围栏；电磁围栏解决了在防御无人机侵入时,不对周边和防护区域造成影响,同时又可以不受地形、植被和建筑的影响,不受城镇复杂电磁环境的限制,完美的提供了类似墙壁的无人机电磁防御围栏。电磁围栏主材采用泄露电缆,寿命长,寿命可达十年到五十年。诱骗信号发生器作为信号发生单元的一种,可以生成任意指定位置和速度的卫星导航模拟信号,结合电磁围栏可以拒止无人机入侵、可以向外驱离进入围栏无人机、可以捕获或击落围栏信号内的无人机。(The invention discloses an unmanned aerial vehicle defense system based on an electromagnetic fence technology, relates to the technical field of unmanned aerial vehicle defense, and particularly relates to an unmanned aerial vehicle defense system based on an electromagnetic fence technology, which comprises the following components: the device comprises a signal generating unit, a power amplifying unit and an electromagnetic fence; electromagnetic fence has solved when defending that unmanned aerial vehicle invades, does not cause the influence to periphery and protective area, can not receive the influence of topography, vegetation and building again simultaneously, does not receive the restriction of the complicated electromagnetic environment in cities and towns, and perfect unmanned aerial vehicle electromagnetic defense fence that provides similar wall. The main material of the electromagnetic fence adopts a leakage cable, so that the service life is long and can reach ten years to fifty years. The luring signal generator is used as one of the signal generating units, can generate satellite navigation analog signals of any specified position and speed, and can refuse unmanned aerial vehicle invasion, can drive outwards to enter the fence unmanned aerial vehicle and can capture or knock down the unmanned aerial vehicle in the fence signal by combining an electromagnetic fence.)

1. The utility model provides an unmanned aerial vehicle defense system based on electromagnetism rail technique which characterized in that includes: the device comprises a signal generating unit, a power amplifying unit and an electromagnetic fence (2);

the signal generating unit is used for generating an unmanned aerial vehicle electromagnetic defense signal, and the power amplifying unit is used for performing power amplification on the unmanned aerial vehicle electromagnetic defense signal generated by the signal generating unit and driving the electromagnetic fence (2) to radiate the unmanned aerial vehicle electromagnetic defense signal subjected to power amplification to the boundary of the defense area (1); the electromagnetic fence (2) is used for generating a clearly-defined signal radiation area;

the power amplification unit is provided with an input end and an output end in signal mode, the signal generation unit is provided with an output end, the input end of the power amplification unit is electrically connected with the signal output end of the signal generation unit, and the signal output end of the power amplification unit is electrically connected with the electromagnetic fence (2).

2. The electromagnetic fence technology based unmanned aerial vehicle defense system of claim 1, characterized in that the electromagnetic fence (2) comprises: the leakage cable is laid along the boundary of the defense area (1), the leakage cable comprises a first end and a second end, and the signal output end of the power amplification unit is electrically connected with the first end of the leakage cable.

3. The electromagnetic fence technology-based unmanned aerial vehicle defense system of claim 2, wherein the signal generation unit comprises: the satellite navigation system decoy signal generator is used for generating a satellite navigation system decoy signal, the satellite navigation system decoy signal comprises a satellite navigation signal which is simulated and emitted at any position and any speed, the decoy signal generator is provided with a signal output end, and the signal output end of the decoy signal generator is electrically connected with the electromagnetic fence (2).

4. The electromagnetic fence technology-based unmanned aerial vehicle defense system of claim 2, wherein the signal generation unit comprises: unmanned aerial vehicle electromagnetic interference signal generator, unmanned aerial vehicle electromagnetic interference signal generator is used for producing the interference electromagnetic wave signal, the interference electromagnetic wave signal is used for blockking up unmanned aerial vehicle wireless communication passageway and/or satellite navigation channel, unmanned aerial vehicle electromagnetic interference signal generator is equipped with signal output part, unmanned aerial vehicle electromagnetic interference signal generator output with electromagnetism rail (2) electricity is connected.

5. The electromagnetic fence technology based unmanned aerial vehicle defense system as claimed in any of claims 3-4, wherein the leaky cable is at least two, the electromagnetic fence (2) further comprises: the circuit amplifier is used for transmitting the enhanced electromagnetic defense signal of the unmanned aerial vehicle at the second end of the leakage cable of the previous stage to the first end of the leakage cable of the next stage after the enhanced electromagnetic defense signal of the unmanned aerial vehicle at the second end of the leakage cable of the previous stage;

the line amplifier comprises a signal input end and a signal output end, the signal input end of the line amplifier is electrically connected with the second end of the leakage cable of the previous stage, and the signal output end of the line amplifier is electrically connected with the first end of the leakage cable of the next stage.

6. The electromagnetic fence technology based unmanned aerial vehicle defense system of claim 5, characterized in that the electromagnetic fence (2) further comprises: an absorbing load for absorbing energy of the leaky cable of the last stage, the absorbing load being electrically connected to the second end of the leaky cable of the last stage.

7. The electromagnetic fence technology-based unmanned aerial vehicle defense system of claim 6, wherein the leaky cable comprises: the insulated cable comprises an inner conductor (3), an insulating medium (4), an outer conductor (5) and a sheath (6), wherein the insulating medium (4), the outer conductor (5) and the sheath (6) are all tubular objects, the inner conductor (3) is fixedly arranged on the inner surface of the insulating medium (4), the outer conductor (5) is fixedly arranged on the outer surface of the insulating medium (4), the sheath (6) is arranged on the outer surface of the outer conductor (5), and a groove penetrating through the inner surface and the outer surface of the outer conductor (5) is formed in the surface of the outer conductor (5).

Technical Field

The invention relates to the technical field of unmanned aerial vehicle defense, in particular to an unmanned aerial vehicle defense system based on an electromagnetic fence technology.

Background

The combination of the satellite navigation technology and the intelligent control technology promotes the rapid development of the unmanned technology, and under the support of the satellite navigation information, the unmanned equipment can accurately and autonomously cruise from the air, the ground or the water surface. The method brings convenience to production and life and also brings serious threat to the public safety field. Abuse and black flying of unmanned aerial vehicles poses serious threats to military, police and security departments, thereby promoting rapid popularization of anti-unmanned aerial vehicle equipment. Currently, the most effective and common anti-drone approaches are radio squashed interference and decoy interference techniques.

According to the requirements of relevant departments of the state, the following four units and regions need to be equipped with anti-unmanned aerial vehicle equipment:

1) political core area, first leader station;

2) the periphery of guard dotted lines involved in foreign activities and other major security tasks;

3) flammable and explosive danger areas such as nuclear power stations, oil refineries, oil reservoirs and the like;

4) a venue for a major event.

The main reaction equipment of the train is of type 3: directional radio voltage systems, omni-directional radio voltage systems, spoofing interference. 2019, all local police have purchased unmanned aerial vehicle counter-braking equipment on a large scale, especially the first capital Beijing: if 2019, 141 drone suppressing devices are issued by the public security bureau of Beijing city for equipping the police of Beijing, and the army is also purchasing in batches. In 2019, 4, 5 days, the interference system of the unmanned aerial vehicle is purchased in large batch by the military for the first time, and the interference suppression capability on the satellite navigation frequency band is definitely provided.

In 2019, 3 months, the national mandatory public safety industry standard GA1551.3-2019 published in the requirements for security and antiterrorist prevention of petroleum and petrochemical systems. The unmanned aerial vehicle defense system is definitely required to be deployed for normal primary prevention in the petroleum and petrochemical industry, only satellite navigation trapping interference equipment meets the corresponding technical requirements, and then the whole petrochemical industry starts the work of purchasing and deploying satellite navigation trapping equipment.

The satellite navigation decoy technology comprises a navigation satellite signal simulation technology, a navigation satellite precise ephemeris decoding and calculating technology, a navigation satellite signal time synchronization technology, a multi-channel radiation power fine adjustment technology, a PID track following induction technology and the like. The method generates navigation satellite positioning coding signals with the same frequency and synchronous time through analog simulation, injects induction information into an unmanned aircraft navigation system, indirectly obtains flight control power, and realizes various tactical targets such as flight forbidding, flight driving, flight path induction and the like.

The existing unmanned aerial vehicle defense method for the navigation trapping area is generally that an omnidirectional antenna is installed in a protection area, a trapping navigation signal is radiated to the whole sky, and the defense range of the area is adjusted by adjusting the radiation power.

The technical method adopted by the existing navigation decoy unmanned aerial vehicle protection system and the defects thereof are as follows:

A. omnidirectional antenna

The omnidirectional antenna has the advantages that the azimuth angle of the beam coverage range is 0-360 degrees, the pitch angle is 0-90 degrees, the hemispherical space can be uniformly covered, and the mode is simple to deploy. The signal covers the entire protected area and, to ensure the protection effect, also extends outwards, leaving time and space for disposal for the system. In this form, the navigation decoy signal will continuously affect the protection area and the left and right areas around the protection area, and in order to also affect the high-altitude route, the method has the greatest side effect, and is the most widely-developed method currently applied, and improvement is urgently needed.

B. Wide beam directional antenna

Generally, a spiral antenna is adopted, the gain of the antenna can be designed to be about 9dB, the horizontal and pitching half-wave power width of the beam is about 60 degrees, and the spliced beam can be cut to cover a specified angle range by using a single antenna or a combination of multiple antennas. This form is generally used to protect against external drone intrusions by shining outside the protected area at the perimeter of the protected area. Thus, the problem of interference on navigation signals in a protective area is solved, but the influence on navigation signals in a peripheral area is increased. In addition, in actual deployment, the influences of weather, vegetation and terrain are also considered comprehensively, antenna power configuration is difficult to accept or reject, and great surrounding defense is seriously influenced. From the application feedback of the petrochemical industry in 2019, the positioning and navigation of surrounding mobile communication base stations and vehicle personnel are seriously influenced. This drawback has seriously restricted electromagnetism to confront the application of unmanned aerial vehicle defense technique, has seriously influenced the effect of unmanned aerial vehicle management and control.

C. Rotary table narrow beam directional antenna array

The antenna array is combined into a cone-shaped wave beam, and under the influence of radar and photoelectric detection equipment, the unmanned aerial vehicle is accurately controlled. This technique can be highly accurate and has little effect on the environment within and around the protected area. However, this form has high requirements for target guidance and high cost, and due to the low and low speed characteristics of small and micro unmanned aerial vehicles, and the complex vegetation, buildings and complex electromagnetic environments close to the ground, the probability of missed reports, missing reports or false reports of radar, radio and optical detection equipment is high, so that the guidance effect is difficult to guarantee, and especially for civil small unmanned aerial vehicles flying close to the ground, the defense effect is difficult to guarantee.

D. Multi-signal source combined antenna customized wave beam

No matter what antenna form is adopted, one antenna transmitting point is difficult to meet the requirements of actual combat defense deployment due to the terrain of a protection target, explosion-proof requirements, vegetation and shielding of production equipment, and usually a method of adopting a plurality of antennas is adopted, and each antenna is responsible for transmitting a navigation decoy signal to one surface outside a protection area. However, the method has the defects that the radiation airspace range of a single antenna is difficult to control accurately, the multiple antennas are difficult to cooperate, and electromagnetic signals are easy to overlap and interfere or have blind areas. In addition, the radiation energy of a single antenna is not uniform in the radiation beam angle range, and the half-power beam angle is generally taken as the radiation width of the single antenna, so that the defense distance is different due to the nonuniformity of the radiation energy of the antenna in the beam angle range.

In 2019, in the next half, the national radio administration has found that high-power anti-unmanned aerial vehicle active defense equipment in areas such as Beijing, Tianjin, Shaanxi, Shanxi, Neimeng, Liaoning, Shanghai, Shandong, Guangxi, Chongqing, Gansu, Ningxia and the like affects military aviation, civil aviation and mobile communication, and some units equipped with unmanned aerial vehicle pressing equipment have affected marine vessels and high-speed rail vehicle communication systems.

The most prominent of them are:

1) 26 th of 9 th of 2019, according to the reflection of a radio management department in Tianjin City, peripheral airport airplanes have navigation errors for many times due to the existing high-power transmitting signals matched with a Zhongpetrochemical Tianjin high-door oil depot, and can land only by flying again when landing, and the later verification is the reason that the high-power omnidirectional satellite navigation interference equipment is deployed.

2) In 2019, a Harbin pig farm is used for protecting the threat of infection virus attack of unmanned aerial vehicles, satellite navigation interference equipment is deployed in a factory, and the equipment power is high, so that past civil aviation flights are influenced, and adverse effects are caused.

The radio interference system interferes the navigation signal, the image transmission signal and the radio remote control signal of the unmanned aerial vehicle target, drives away or makes the unmanned aerial vehicle return to the ground and force to land.

The radio interference system mainly comprises a power supply system, a control module, a core module and an antenna system. The core module comprises signal generator and radio frequency power amplifier, through the information format of analysis unmanned aerial vehicle remote control link signal, realizes blocking the navigation link of unmanned aerial vehicle and remote controller, triggers unmanned aerial vehicle's flight control protection system, realizes returning voyage or descending of unmanned aerial vehicle. The control module controls the core module to realize the transmission of the interference signal.

Radio interference surgery requires high power electromagnetic radiation to combat the high power air-to-ground communication links of drones, which can also have a severe impact on the surrounding environment, can affect the operation of frequency-using equipment, and can affect the surrounding work and living environment.

The invention is an active defense means, can effectively defend the wall against the real electromagnetic waves existing in the illegal unmanned aerial vehicle, can be changed and configured by users, and is a defense means adopted by the unmanned aerial vehicle defense party.

Disclosure of Invention

The invention provides an unmanned aerial vehicle defense system based on an electromagnetic fence technology, which is used for solving the problem of electromagnetic interference of the surrounding environment in a defense area of an unmanned aerial vehicle.

The invention adopts the following technical scheme:

an unmanned aerial vehicle defense system based on electromagnetic fence technology includes: the device comprises a signal generating unit, a power amplifying unit and an electromagnetic fence; the signal generating unit is used for generating an unmanned aerial vehicle electromagnetic defense signal, and the power amplifying unit is used for performing power amplification on the unmanned aerial vehicle electromagnetic defense signal generated by the signal generating unit and driving the electromagnetic fence to radiate the unmanned aerial vehicle electromagnetic defense signal subjected to power amplification to a defense area boundary; the electromagnetic fence is used for generating a clearly-defined signal radiation area; the power amplification unit signal is equipped with input and output, the signal generation unit is equipped with the output, the power amplification unit input with signal generation unit signal output end electricity is connected, the power amplification unit signal output end with the electromagnetism rail electricity is connected.

Further, the electromagnetic fence comprises: the leakage cable is laid along the boundary of the defense area and comprises a first end and a second end, and the signal output end of the power amplification unit is electrically connected with the first end of the leakage cable.

Further, the signal generation unit includes: the satellite navigation system comprises a decoy signal generator, wherein the decoy signal generator is used for generating a decoy signal of a satellite navigation system, the decoy signal of the satellite navigation system comprises a satellite navigation signal which is simulated and emitted at any position and any speed, the decoy signal generator is provided with a signal output end, and the signal output end of the decoy signal generator is electrically connected with the electromagnetic fence.

Further, the signal generation unit includes: unmanned aerial vehicle electromagnetic interference signal generator, unmanned aerial vehicle electromagnetic interference signal generator is used for producing the interference electromagnetic wave signal, the interference electromagnetic wave signal is used for blockking up unmanned aerial vehicle wireless communication passageway and/or satellite navigation channel, unmanned aerial vehicle electromagnetic interference signal generator is equipped with signal output part, unmanned aerial vehicle electromagnetic interference signal generator output with the electromagnetism rail electricity is connected.

Further, the leakage cable is at least two, and the electromagnetic fence further comprises: the circuit amplifier is used for transmitting the enhanced electromagnetic defense signal of the unmanned aerial vehicle at the second end of the leakage cable of the previous stage to the first end of the leakage cable of the next stage after the enhanced electromagnetic defense signal of the unmanned aerial vehicle at the second end of the leakage cable of the previous stage; the line amplifier comprises a signal input end and a signal output end, the signal input end of the line amplifier is electrically connected with the second end of the leakage cable of the previous stage, and the signal output end of the line amplifier is electrically connected with the first end of the leakage cable of the next stage.

Further, the electromagnetic fence further comprises: an absorbing load for absorbing energy of the leaky cable of the last stage, the absorbing load being electrically connected to the second end of the leaky cable of the last stage.

Further, the leaky cable includes: the cable comprises an inner conductor, an insulating medium, an outer conductor and a sheath, wherein the insulating medium, the outer conductor and the sheath are all tubular objects, the inner conductor is fixedly arranged on the inner surface of the insulating medium, the outer conductor is fixedly arranged on the outer surface of the insulating medium, the sheath is arranged on the outer surface of the outer conductor, and grooves penetrating through the inner surface and the outer surface of the outer conductor are formed in the surface of the outer conductor.

The invention has the following positive effects:

the invention discloses an unmanned aerial vehicle defense system based on an electromagnetic fence technology, which comprises the following components: the device comprises a signal generating unit, a power amplifying unit and an electromagnetic fence; the invention solves the most troublesome problem in the defense application of the navigation trapping unmanned aerial vehicle: when external intrusion equipment such as an unmanned aerial vehicle is defended, the periphery and a protection area are not affected, meanwhile, the unmanned aerial vehicle is not affected by terrain, vegetation and buildings, and is not limited by complex electromagnetic environments in cities and towns, and an unmanned aerial vehicle electromagnetic defense fence similar to a wall is perfectly provided; the defense range defined by the electromagnetic fence is clear, and the electromagnetic environment in the defense area range cannot be interfered while external invasion equipment is defended; the thickness of the electromagnetic fence constructed by the electromagnetic fence can be adjusted by adjusting the transmission power of the power amplification unit according to needs, and the radiation intensity and the coverage area of the electromagnetic fence are smaller due to climate, weather and terrain factors than those of the prior art.

The signal generating unit of the defense system comprises a decoy signal generator which is one of the signal generating units and can generate satellite navigation decoy signals to form an electromagnetic signal fence with controllable thickness and height; the satellite navigation decoy signal coverage area with clear generation limit and controllable thickness and height plays a role of an unmanned aerial vehicle for intercepting, driving away, prohibiting flying, capturing or knocking down the invasion area;

the signal generation unit of the defense system comprises an unmanned aerial vehicle electromagnetic interference signal generator, unmanned aerial vehicle communication navigation interference is that a large amount of electromagnetic wave radiation is generated by transmitting a high-power signal, a satellite navigation signal (comprising a GPS, a Beidou, a Glonass and a Galileo) channel is blocked, and unmanned aerial vehicle communication channels such as a 2.4GHz remote control signal and a 5.8GHz image transmission signal are formed. The signal of high power blocks outside unmanned aerial vehicle navigation, remote control or image transmission signal, can make unmanned aerial vehicle wireless communication channel effective input SNR descend, and then blocks unmanned aerial vehicle's navigation, remote control and air-ground data communication link.

The leakage cable at the tail end of the electromagnetic fence is also provided with an absorption load for absorbing the tail end energy of the leakage cable at the tail end, so that the voltage standing wave ratio of the leakage cable is reduced, the energy reflection of the leakage cable terminal is reduced, and the overall performance of the system is improved.

The leakage cable is in a realization form that an inner conductor and an outer conductor are provided with insulating media, electromagnetic waves radiate to the outside through a groove arranged on the outer conductor, and the direction and the range of the electromagnetic waves are controllable, so that an electromagnetic wave radiation area with controllable width and height is formed along the leakage cable. The electromagnetic wave is configured into an unmanned aerial vehicle defense signal, so that the unmanned aerial vehicle electromagnetic defense fence can be realized.

1. The electromagnetic fence provided by the invention adopts the leakage cable as the main material, has long service life which can reach thirty years to fifty years, is used for a long time, and greatly saves the cost. The life advantage is obvious compared with the prior art that the main part has 1-3 years.

2. Because the electromagnetic wave is along revealing the radial radiation of cable, and it is relatively even along axial electromagnetic energy radiation, can make things convenient for the direction and the scope of control cable radiation, can solve and use a plurality of antennas cooperatees difficultly, and the signal overlaps the problem of disturbing or having the blind area.

3. Can all-weather, 24 hours work, through well-designed, steerable cable radiation of revealing is radial outside radiation, and then makes radial inner region no signal coverage to do not influence equipment and personnel work, the life order in the region.

4. The method is flexible and convenient, can arrange the regional defense electromagnetic fence with any shape and height according to the needs, has wide adaptability, can meet the deployment requirements of 4 types of places, does not influence the surrounding environment, and provides the most appropriate technical support for the implementation of the file at present.

5. The erection is convenient, can hang and arrange on the existing fence, can be laid by shallow concrete burying, can also be erected by PVC (polyvinyl chloride) pipes, is neat and attractive, and can be integrally designed and integrally constructed during building design. The existing equipment must be erected and deployed at a height-making point, and the site selection and the erection mode directly influence the protection effect and the surrounding production and living environment.

The invention aims to provide a cable leakage electromagnetic fence method for strictly controlling a satellite navigation trapping signal action area aiming at the problem of influence of satellite navigation trapping equipment on electromagnetic interference in a protection area and the surrounding environment in unmanned aerial vehicle defense application and on satellite navigation terminal positioning, navigation and time service (PNT) application. The method limits satellite navigation signal defense signals in the area with the perimeter with the designated thickness and height, and solves the problem that the satellite navigation is influenced on the normal application of the satellite navigation in the satellite navigation decoy defense application.

The unmanned aerial vehicle defense system has the advantages of mature technology, stable performance, convenient and fast erection, safety and reliability, and can be widely applied to unmanned aerial vehicle defense of planar and linear areas such as military grounds, primary security areas, airports, border lines, expressways and railways, ports, inland airlines and the like.

Drawings

FIG. 1 is a schematic structural diagram of a defense system of an unmanned aerial vehicle according to an embodiment of the invention;

FIG. 2 is a schematic view of an electromagnetic fence according to an embodiment of the present invention;

fig. 3 is a schematic view of a leaky cable according to an embodiment of the present invention.

In the figure: defense area 1, electromagnetic fence 2, inner conductor 3, insulating medium 4, outer conductor 5, sheath 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1-3, an unmanned aerial vehicle defense system based on electromagnetic fence technology includes: the device comprises a signal generating unit, a power amplifying unit and an electromagnetic fence 2; the signal generating unit is used for generating an unmanned aerial vehicle electromagnetic defense signal, and the power amplifying unit is used for performing power amplification on the unmanned aerial vehicle electromagnetic defense signal generated by the signal generating unit and driving the electromagnetic fence 2 to radiate the unmanned aerial vehicle electromagnetic defense signal subjected to power amplification to the boundary of the defense area 1; the electromagnetic fence 2 is used for generating a well-defined signal radiation area; the power amplification unit is provided with an input end and an output end in terms of signals, the signal generation unit is provided with an output end, the input end of the power amplification unit is electrically connected with the signal output end of the signal generation unit, and the signal output end of the power amplification unit is electrically connected with the electromagnetic fence 2.

More specifically, the unmanned aerial vehicle is an unmanned aerial vehicle, an unmanned vehicle or an unmanned ship. The unmanned aerial vehicle electromagnetic defense signal is a satellite navigation system decoy signal or an unmanned aerial vehicle electromagnetic interference signal. The electromagnetic fence 2 is a satellite navigation decoy signal which emits a designated angle and a designated distance along the boundary of the defense area 1, a protective fence with a designated height and a designated thickness is constructed on the boundary of the defense area 1, and the fence can prevent the unmanned aerial vehicle from invading, can drive outwards to enter the fence unmanned aerial vehicle and can capture or knock down the unmanned aerial vehicle in the fence signal. The method limits the satellite navigation signal defense signals in the area with the boundary of the specified thickness and height, and solves the problem that the satellite navigation is influenced on the normal application of the satellite navigation in the satellite navigation decoy defense application.

The signal generating unit is used for generating an unmanned aerial vehicle electromagnetic interference signal, such as a satellite navigation decoy signal, a navigation suppression interference signal or a map transmission and link interference signal.

And the working frequency of the power amplification unit covers all navigation, image transmission and link interference signal frequency bands, and the weak signal generated by the signal generation unit is amplified to the required power on the premise of keeping undistorted. For example, in an electromagnetic fence 2 applying the navigation spoofing signal, a signal feed-in end of the electromagnetic fence receives the navigation spoofing signal amplified by the power amplifier, and the power of the navigation spoofing signal can be adjusted by the power amplifier to control the distance covered by the electromagnetic wave emitted by the electromagnetic fence 2, for example, in a specific embodiment, the output power of the power amplifier is 10mW, and the coverage range of the main beam can reach hundreds of meters. The thickness of the electromagnetic fence 2 can be adjusted to a certain extent by configuring the power of the power amplifying unit.

When the electromagnetic fence is constructed, the characteristics of the boundary of a protection area, the landform, the vegetation building and the surrounding environment are comprehensively considered, and the specific requirements of the protection area, the performance of a defense target, a possible invasion form and the like are considered. Formally: a rectangular area, a circular area, a special-shaped area and the like can be enclosed, even a closed area can not be enclosed, for example, an electromagnetic fence is provided with a straight line section, a section of circular arc, a rectangle with an opening, a triangle with an opening and the like; the system can be combined by one or more defense units, is configured to be 24-hour unmanned aerial vehicle on-duty active defense, can be configured to be directionally driven away or receive real-time control of an instruction control system, and is fused into a higher-level system.

This product during operation, signal generation unit generate unmanned aerial vehicle electromagnetism defense signal, and after power amplification unit enlargies, radiate out this unmanned aerial vehicle electromagnetism defense signal through electromagnetism rail 2, the true signal of shutoff to defend the unmanned aerial vehicle invasion. The orientation of the signal is limited to the electromagnetic fence only, while the area inside the electromagnetic fence 2 and the area outside the electromagnetic fence 2 are unaffected.

If the signal generating unit generates satellite navigation trap signals, functions of unmanned aerial vehicle single-machine or cluster unmanned area flying-forbidding, automatic directional driving-away, fixed-point hitting-down and the like can be realized, and areas in the electromagnetic fence 2 are not influenced by the navigation trap signals, so that intrusion equipment in any area, such as unmanned aerial vehicle electromagnetic fence 2, can be defended.

Further, the electromagnetic fence 2 includes: the leakage cable is laid along the boundary of the defense area 1 and comprises a first end and a second end, and the signal output end of the power amplification unit is electrically connected with the first end of the leakage cable.

More specifically, the leaky cable is a high-frequency transmission line which integrates signal transmission, emission and receiving characteristics, has dual functions of a coaxial cable and an antenna, and because the outer conductor is regularly grooved, electromagnetic waves can be leaked out to form signal field intensity in the outer space of the cable. The leakage cable can not only transmit electromagnetic waves along the axial direction but also radiate the electromagnetic waves along the radial direction, is flexible and convenient, has reliable quality and uniform radiation electromagnetic waves, and is always used for solving the problems of blind areas, people and object intrusion detection and the like in wireless communication. The inventor of the invention selects the leakage cable to construct the electromagnetic fence 2 through multiple attempts, and the leakage cable is used for solving the problem of the incidental influence of the electromagnetic defense application of the unmanned aerial vehicle.

The frequency of the leakage cable covers 1.2GHz-6GHz, navigation, remote control and communication frequency bands used by all existing unmanned aerial vehicles are completely covered, and through careful design, the leaked energy radiates towards one radial side of the cable, and the backward radiation is weak. When installed, the leaky cable is arranged around the area to be protected and such that the cable radiation direction is outside the defence area 1, thereby making the protection area almost radiationless electromagnetic waves.

In the construction of electromagnetism rail 2, both can hang the deployment on current rail and reveal the cable, also can bury shallowly in the concrete and lay, can also the PVC poling erect, and is clean and tidy pleasing to the eye, and reveals the cable and lay the back very concealably as the emitter that is used for radiating electromagnetic defense signal, hardly discovers, especially when the building design with regard to this kind of condition of integrative design integrative construction, the malicious destruction of avoiding personnel that can the at utmost. Compared with the prior art, the signal generating device adopting other modes has the advantages that equipment must be elevated and deployed at a high point, and the site selection and the erection mode directly influence the protection effect and the surrounding production and living environment.

Further, the signal generation unit includes: the satellite navigation system comprises a decoy signal generator, the decoy signal generator is used for generating a decoy signal of a satellite navigation system, the decoy signal of the satellite navigation system comprises a satellite navigation signal which is used for simulating and transmitting any position and any speed, the decoy signal generator is provided with a signal output end, and the signal output end of the decoy signal generator is electrically connected with the electromagnetic fence 2.

More specifically, the navigation spoofing signal generator is configured to generate a satellite navigation analog signal at any specified position and speed, that is, a so-called pseudo signal, which is amplified by a power amplifier and then radiated by the electromagnetic fence 2 to intercept a real signal with weak power in the sky, so that the satellite navigation receiving terminal in a coverage area of the pseudo signal can be invaded, and the analog position and speed information is injected into a satellite navigation system of the satellite navigation receiving terminal to implement satellite navigation spoofing.

For the unmanned aerial vehicle, the unmanned aerial vehicle can also realize functions of no-fly, automatic directional driving away, fixed-point impact and the like in a single unmanned aerial vehicle or a cluster unmanned area, and the area in the electromagnetic fence 2 is not influenced by the navigation decoy signal, so that the defense of the unmanned aerial vehicle electromagnetic fence 2 in any area is realized.

Further, the signal generation unit includes: unmanned aerial vehicle electromagnetic interference signal generator, unmanned aerial vehicle electromagnetic interference signal generator are used for producing the interference electromagnetic wave signal, and the interference electromagnetic wave signal is used for blockking up unmanned aerial vehicle wireless communication passageway and/or satellite navigation channel, and unmanned aerial vehicle electromagnetic interference signal generator is equipped with signal output part, and unmanned aerial vehicle electromagnetic interference signal generator output is connected with 2 electricity on the electromagnetic fence.

The interference electromagnetic wave is that a large amount of electromagnetic wave radiation is generated by transmitting a high-power signal, and satellite navigation signals (including GPS, Beidou, Glonass and Galileo) and 2.4GHz remote control signals and 5.8GHz image transmission signals are interfered. Thereby block external invasion equipment like unmanned aerial vehicle navigation signal, remote control signal or image transmission signal, through exerting the interference electromagnetic wave signal to external invasion equipment, can make external invasion equipment's effective input SNR descend, and then the influence makes external invasion unmanned aerial vehicle can not get into the defense area 1 that electromagnetism rail 2 defined.

Further, the leakage cables are at least two, and the electromagnetic fence 2 further includes: the circuit amplifier is used for transmitting the enhanced electromagnetic defense signal of the unmanned aerial vehicle at the second end of the previous-stage leakage cable to the first end of the next-stage leakage cable; the line amplifier comprises a signal input end and a signal output end, the signal input end of the line amplifier is electrically connected with the second end of the previous-stage leakage cable, and the signal output end of the line amplifier is electrically connected with the first end of the next-stage leakage cable.

Further, the electromagnetic fence 2 further includes: and the absorption load is used for absorbing energy of the final-stage leakage cable and is electrically connected with the second end of the final-stage leakage cable.

Since the leaky cable has loss when the transmission distance is long, in order to ensure the output power of the antenna, a line amplifier is installed at every other distance to compensate the loss of line attenuation, for example, in one embodiment, a line amplifier needs to be installed at every 500 meters, so as to offset the signal loss caused by line attenuation.

The end of the leakage cable is connected with an absorption load, the main function of the load is to completely absorb microwave energy from the transmission line and improve the matching performance of the circuit, the load is usually connected with the end of the circuit, so the load is also called an end load or a matching load and is used for absorbing end energy, and the voltage standing wave ratio of the leakage cable is reduced. The absorption load is to absorb residual power which cannot be radiated by the leaked cable terminal by using a medium, and can almost completely absorb microwave power and rarely reflect the microwave power, so that the leaked cable terminal is in a non-reflection matching state.

Microwave coaxial load is a microwave passive single-port device, and is widely applied to microwave equipment and microwave circuits. The radio frequency coaxial load is widely applied to systems such as radio equipment, electronic instruments and various microwave equipment, impedance matching is carried out on the spare channel and the test port of the vacant position, signal impedance matching is guaranteed, and meanwhile signal leakage of the vacant port and mutual interference among the systems are greatly reduced.

In this embodiment, the electromagnetic fence 2 is formed by cascading two leaky cables, the two leaky cables are respectively a first leaky cable and a second leaky cable, a first end of the first leaky cable is electrically connected to the output end of the power amplification unit, a second end of the first leaky cable is electrically connected to the signal input end of the line amplifier, a signal output end of the line amplifier is electrically connected to a first end of the second leaky cable, and a second end of the second leaky cable is electrically connected to the absorption load.

One set of unmanned aerial vehicle electromagnetic fence defense unit generally comprises a signal generator, a power amplifier, one reveals the cable and absorbs the load and constitutes, but when the protection zone border is longer, can reveal and can imbed the line amplifier between the cable, cascade, can strengthen along with the decay signal that increases apart from to reach the construction and can adapt to the regional electromagnetic fence girth of defense.

In practice, the defense system adopts a plurality of electromagnetic fence defense units which can comprise one or more sets of unmanned aerial vehicles. Each defense unit signal generating unit can be equipped with different defense parameters, can be controlled to be started in a sectional mode, can receive the control of the control system in a wired or wireless mode, and can automatically and intelligently defend the invasion of multi-batch and multi-direction unmanned aerial vehicles.

The defense system may be configured in a 24 hour drone attended automatic defense mode and a directional drive away mode.

24-hour unmanned aerial vehicle on duty automatic defense mode: according to the characteristics of different defense areas 1, the defense areas 1 are divided into four (south-east-west-north), eight (east, west, south, north, south-east, south-west, north-east, north-west) or more defense directions according to requirements, each direction is provided with an independent unmanned aerial vehicle satellite navigation decoy defense unit, and the defense effect is configured to drive away the invading unmanned aerial vehicle in the opposite direction to the defense direction.

Directional driving-away mode: according to the characteristics of different defense areas 1, divide into four (south-east-west-north), eight (east, west, south, north, south-east, south-west, north-east, north-west) or even more defense positions with defense area 1 according to the demand, but every position leaks the cable independent switch, all leak the cable and be connected to a signal generator: the signal generator is used for configuring a driving direction for guiding and deceiving the anti-unmanned aerial vehicle signal according to the guidance of external reconnaissance detection equipment, automatically opening a corresponding leakage cable and intercepting and driving the invading unmanned aerial vehicle.

Further, the leaky cable includes: the inner conductor 3, the insulating medium 4, the outer conductor 5 and the sheath 6 are all tubular objects, the inner conductor 3 is fixedly arranged on the inner surface of the insulating medium 4, the outer conductor 5 is fixedly arranged on the outer surface of the insulating medium 4, the sheath 6 is arranged on the outer surface of the outer conductor 5, and the surface of the outer conductor 5 is provided with a groove penetrating through the inner surface and the outer surface of the outer conductor 5.

The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.