An unmanned aerial vehicle communication link countermeasure system based on a Vivaldi antenna

Abstract

The present application relates to the technical field of unmanned aerial vehicle interference, and provides an unmanned aerial vehicle communication link countermeasure system based on a Vivaldi antenna, an antenna array including a signal receiving unit and a signal transmitting unit; wherein the antenna array is fixed in an expandable mechanical frame by at least two groups of staggered Vivaldi antenna units; a wideband interference component: for responding to the spectrum signal of the unmanned aerial vehicle to be suppressed through the receiving unit, and generating a first interference signal; wherein the interference frequency band corresponding to the first interference signal is the same as the real-time communication frequency band of the unmanned aerial vehicle to be suppressed, and the expandable mechanical frame is used for determining the number and angle of the unfolded surface array in response to the first interference signal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unmanned aerial vehicle countermeasure, and particularly relates to an unmanned aerial vehicle communication link countermeasure system based on a Vivaldi antenna. BACKGROUND

[0002] In today's era of rapid technological development, unmanned aerial vehicles such as unmanned aerial vehicles are increasingly widely used in civilian and military fields. While providing convenience and innovation, they also pose a security risk that cannot be ignored.

[0003] The existing anti-unmanned aerial vehicle equipment faces a series of technical problems when dealing with unmanned aerial vehicle threats. First, the monitoring limitations of anti-unmanned aerial vehicle equipment are reflected in the insufficient tracking ability of unmanned aerial vehicles in complex environments and variable scenarios, making it difficult to achieve all-around, dead-angle-free monitoring coverage. Second, the single nature of the defense strategy makes it difficult for anti-unmanned aerial vehicle equipment to take personalized defense measures against unmanned aerial vehicles of different types, speeds, and flight altitudes, resulting in unsatisfactory defense effects.

[0004] Furthermore, the intelligent analysis capability of anti-unmanned aerial vehicle equipment is insufficient, making it difficult to conduct in-depth analysis of the behavior patterns of unmanned aerial vehicles, thus failing to accurately judge their potential threats, resulting in frequent false positives and false negatives. In addition, the adaptability of anti-unmanned aerial vehicle equipment is poor, making it difficult to cope with irregularly shaped monitoring areas and complex and variable unmanned aerial vehicle flight paths. The frequent need for human intervention not only increases the difficulty of operation, but also reduces the automation level and response speed of anti-unmanned aerial vehicle equipment. Finally, the compatibility problem of anti-unmanned aerial vehicle equipment makes it difficult for anti-unmanned aerial vehicle equipment to effectively integrate with other security systems, limiting the improvement of overall security efficiency.

[0005] In patent document CN115996103A, an adaptive radio frequency interference system and method for unmanned aerial vehicle frequency hopping communication are proposed to realize unmanned aerial vehicle countermeasures and interfere with frequency hopping communication unmanned aerial vehicles. However, it belongs to a fixed architecture, and the power amplifier only fixes the amplification factor according to the optimal interference transmission power, without considering multiple target interference or dynamic load changes, which may result in power waste or distortion of interference signals. Moreover, only narrowband noise interference signals are generated, without supporting deception interference, coherent modulation mode blocking signals, and other composite interference means, which have limited effect on unmanned aerial vehicles with anti-narrowband interference capability. SUMMARY

[0006] The present application proposes an unmanned aerial vehicle communication link countermeasure system based on a Vivaldi antenna, which is used to cover a wider unmanned aerial vehicle communication frequency band, improve the directivity of interference signals, cope with unmanned aerial vehicle targets at different distances and directions, and realize precise frequency band coverage interference.

[0007] In a first aspect, a UAV communication link countermeasure system based on Vivaldi antenna comprises:

[0008] An antenna array comprising a signal receiving unit and a signal transmitting unit; wherein the antenna array is fixed in an expandable mechanical frame by at least two groups of staggered Vivaldi antenna units;

[0009] A wideband jamming component: for generating a first jamming signal in response to the spectrum signal of the UAV to be suppressed by the receiving unit; wherein the interference frequency band corresponding to the first jamming signal is the same as the real-time communication frequency band of the UAV to be suppressed, and the expandable mechanical frame is used to adjust the number and angle of the expanded surface array of the expandable mechanical frame in response to the first jamming signal;

[0010] The power supply ends of the antenna array and the wideband jamming component are electrically connected with the power supply module.

[0011] In combination with the first aspect, the expandable mechanical frame has a plurality of expansion surfaces, the expansion surfaces are provided with standardized slots, the Vivaldi antenna units are fixed through the standardized slots, and the expansion surfaces are used for one-dimensional or two-dimensional expansion.

[0012] In combination with the first aspect, the wideband jamming component comprises a jamming signal receiving unit and a jamming generating unit;

[0013] The jamming signal receiving unit is composed of a receiving antenna, a low-noise amplifier and an adjustable band-pass filter, and the receiving antenna is a Vivaldi antenna unit;

[0014] The jamming generating unit comprises a wideband signal generator and a modulator, for generating a noise signal or a sweep signal; wherein the wideband signal generator is provided with a first frequency divider, and the first frequency divider is used to adjust the real-time frequency band of the wideband signal generated by the wideband signal generator.

[0015] In combination with the first aspect, the jamming generating unit receives the spectrum signal of the UAV to be suppressed, adjusts the fundamental frequency of the output signal through the first frequency divider, so that the output frequency band of the wideband signal generator covers the spectrum signal of the UAV to be suppressed;

[0016] and determines the type of jamming signal according to the protocol characteristics of the UAV to be suppressed; wherein,

[0017] If the target UAV uses a frequency hopping communication protocol, the modulator generates a sweep signal;

[0018] If the target UAV uses a fixed frequency communication protocol, the modulator generates a noise signal.

[0019] In combination with the first aspect, the input end of the wideband jamming component and the output end of the antenna array are also connected with a signal processing module;

[0020] The signal processing module comprises an analog-to-digital converter, a multi-core DSP processor and a protocol feature database, and the protocol feature database is used to store time-frequency characteristic parameters of remote control signals, image transmission signals and navigation signals of the unmanned aerial vehicle.

[0021] In combination with the first aspect, the receiving unit, in response to the spectrum signal of the unmanned aerial vehicle to be suppressed, further comprises:

[0022] The received spectrum signal is input into a low-noise amplifier for primary amplification, and the amplified signal is input into an adjustable band-pass filter for preliminary filtering to generate a first signal;

[0023] After the first signal is converted into a target digital signal by the analog-to-digital converter, the multi-core DSP processor calls the time-frequency characteristic parameters stored in the protocol feature database to perform time-frequency analysis and feature matching with the target digital signal;

[0024] If the characteristic parameters of the unmanned aerial vehicle to be suppressed are matched, the DSP processor extracts the real-time communication frequency band of the unmanned aerial vehicle to be suppressed, generates a first control instruction including the first interference signal, and the first control instruction includes an unfolding instruction of the expandable mechanical frame.

[0025] In combination with the first aspect, the unfolding instruction includes an unfolding number of expansion surfaces and an unfolding angle;

[0026] If the unfolding number of expansion surfaces exceeds the current number of deployed expansion surfaces, the expansion mechanism of the mechanical frame is triggered to unfold and fix the standby expansion surfaces by one-dimensional or two-dimensional splicing;

[0027] After the standby expansion surfaces are unfolded and fixed, the included angle between each expansion surface and the horizontal plane is determined according to the unfolding angle.

[0028] In combination with the first aspect, the power module comprises a first AC conversion circuit, a constant current loop unit and a first MOS tube;

[0029] The input end of the constant current loop unit is connected to the output end of the first AC conversion circuit, and the other input end of the constant current loop unit is connected to the wideband interference assembly, and the target current of the interference frequency band corresponding to the first interference signal is determined;

[0030] The output end of the constant current loop unit is connected to the power supply end of the antenna array through the source electrode of the first MOS tube, and the input current of the antenna array is controlled to be the target current.

[0031] In combination with the first aspect, the constant current loop unit converts external alternating current into stable direct current through the first AC conversion circuit, and inputs the stable direct current into the current control end of the constant current loop unit;

[0032] The current control signal is generated according to the target current and is transmitted to the gate of the first MOS tube, and the current flowing through the source of the first MOS tube is stabilized as the target current by adjusting the on-duty ratio of the first MOS tube; wherein the stabilized current is transmitted to each Vivaldi antenna unit of the antenna array through the power supply circuit.

[0033] In combination with the first aspect, the wideband interference component further comprises a monitoring component for collecting the antenna state of the antenna array under the first interference signal, wherein if more than a threshold number of antenna units in any expansion surface of the expandable mechanical frame are detected to be in a fault state, the expansion surface is marked as a fault surface, and a fault alarm signal is generated;

[0034] The expandable mechanical frame responds to the fault alarm signal and generates an angle adjustment operation of the adjacent expansion surface of the fault surface, and when the angle adjustment operation is performed and the interference range of the to-be-suppressed unmanned aerial vehicle is different from the expected interference range, a redundant expansion mechanism of the expandable mechanical frame is triggered.

[0035] The beneficial effects of the above technical solution are that:

[0036] The present application determines the spectrum signal of the to-be-suppressed unmanned aerial vehicle by receiving the response of the receiving unit, and generates an interference signal. The generated interference signal has the same real-time communication frequency band as the to-be-suppressed unmanned aerial vehicle, and realizes targeted interference. In this process, the expandable mechanical frame and the wideband interference component have a closed-loop control relationship, and the parameters of the to-be-suppressed unmanned aerial vehicle interference signal are automatically adjusted to the number of surfaces to be expanded and the angle of adjustment, realizing a full-range and dead-angle-free dynamic suppression effect.

[0037] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure specifically pointed out in the written description and the accompanying drawings.

[0038] The technical solutions of the present application will be further described in detail below by means of the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, for explaining the present application, and do not constitute a limitation on the present application.

[0040] In the drawings:

[0041] Figure 1 A hardware architecture diagram of an unmanned aerial vehicle communication link countermeasure system based on a Vivaldi antenna in an embodiment of the present application is shown in the figure.

[0042] Figure 2 This is a diagram illustrating the composition of the broadband interference component in an embodiment of the present invention.

[0043] Figure 3 This is a flowchart illustrating the execution process of the monitoring component in an embodiment of the present invention. Detailed Implementation

[0044] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0045] The Vivaldi antenna is a broadband directional antenna based on the principle of leaky wave antennas. It is constructed by creating slots in a metal substrate, with exponentially or linearly graded metal patches on either side of the slots. It also incorporates microstrip lines, coplanar waveguides, and other feed lines for excitation, achieving slow leakage of electromagnetic waves, resulting in ultra-wide bandwidth and high directivity, and stable radiation and reception of electromagnetic waves over a wide frequency range. It overcomes the frequency band limitations and insufficient directivity of narrowband antennas such as dipole and ordinary patch antennas.

[0046] Countermeasures against drone communication links involve sending interference, blocking, or deception signals between the drone and its control station to disrupt data transmission capabilities, thereby enabling drone interception, drone shooting down, and drone deception.

[0047] In anti-drone communication link systems, Vivaldi antenna technology is still in the exploratory stage and has not yet been widely adopted. Vivaldi antenna technology meets the needs of anti-drone systems from the perspectives of ultra-wide bandwidth and high directivity. However, in existing technologies, the main antenna arrangements are still linear and fixed array arrangements. Therefore, the beam direction is fixed and the cross-polarization performance is poor. Furthermore, in the application of existing antennas, the mechanical frame is generally fixed, making it impossible to adjust the number and angle of the interference antenna array according to requirements, and thus unable to emit interference signals as needed. Finally, and this is the core deficiency of existing technology, the control system and antenna system for the interference signal are independent. When facing new drones operating in unknown frequency bands, hardware modules need to be replaced to achieve effective interference.

[0048] To address the aforementioned issues, this application proposes a UAV communication link countermeasure system based on a Vivaldi antenna. The system determines the spectral signal of the UAV to be suppressed through a receiving unit response and generates an interference signal. The generated interference signal corresponds to the same interference frequency band as the real-time communication frequency band of the UAV to be suppressed, achieving targeted interference. In this process, a closed-loop control relationship is established between the scalable mechanical frame and the broadband interference components, along with the parameters of the interference signal from the UAV to be suppressed. The system automatically adjusts the number of unfolded surfaces and the adjustment angle to achieve a dynamic suppression effect with no blind spots.

[0049] The scheme in the embodiments of the present application will be described in detail below with reference to the drawings.

[0050] Embodiment 1:

[0051] As Figure 1 shown, the present application proposes a UAV communication link countermeasure system based on Vivaldi antenna, which comprises:

[0052] The antenna array comprises a signal receiving unit and a signal transmitting unit; wherein the antenna array is fixed in an expandable mechanical frame by at least two groups of staggered Vivaldi antenna units.

[0053] In the present application, the receiving unit of the antenna array is used to collect electromagnetic waves generated during UAV communication, and convert the electromagnetic wave signals into electrical signals. The transmitting unit is used to convert the interference electrical signals into electromagnetic wave radiation. Through bidirectional sensing, the interference of the to-be-suppressed UAV is realized.

[0054] In an embodiment, the Vivaldi antenna is a tapered slot antenna, and the current is distributed along the slot line. Different working frequencies correspond to different parts of the slot line to realize the reception or radiation of electromagnetic signals. When the current flows through the metal sheet, the interaction of the electric field and the magnetic field between the metal sheets is generated. The structure design of the involute line arrangement enables the electrical signals to propagate in the antenna at multiple frequency bands. The semicircular stub and the circular resonant cavity help to realize impedance matching in the bandwidth range, thereby improving the radiation efficiency of the antenna in the working frequency band.

[0055] In an embodiment, the antenna array of the Vivaldi antenna is staggered, which is used to reduce the mutual coupling between the array units and prevent mutual interference of the electromagnetic fields of adjacent antennas. At the same time, the consistency of the array direction adjustment is improved, so that in the process of sending UAV interference signals, compared with a single antenna or a parallel array, a wider UAV communication frequency band can be covered, the directivity of the interference signal is improved, the energy dispersion is reduced, and the wideband and high gain characteristics of the present application based on the Vivaldi antenna are possessed.

[0056] In the present application, the expandable mechanical frame realizes the expansion of the number of surface arrays and the adjustment of the angle through the expandable structure. The adjacent surface arrays are connected through rotating joints to realize expansion. The angle adjustment is realized through sliding guide rails, which physically change the aperture size and direction of the array. In actual implementation, the rotating joint is driven by a servo motor, and the 45° pitch angle is adjusted. The sliding guide rails realize the horizontal splicing of the surface arrays through the screw transmission.

[0057] In an embodiment, based on the extensible mechanical framework, when the UAV is intercepted, the UAV target with different distances and different directions is adapted, for example, a small face array is needed for a close-range UAV to reduce energy waste, a large face array is needed for a long-distance to improve gain; the UAV coming from the side needs to adjust the array angle to align the target direction.

[0058] The wideband interference component is used to generate a first interference signal in response to the spectrum signal of the UAV to be suppressed by the receiving unit, wherein the interference frequency band corresponding to the first interference signal is the same as the real-time communication frequency band of the UAV to be suppressed, and the extensible mechanical framework is used to determine the number and angle of the expanded face array in response to the first interference signal.

[0059] In this application, the first interference signal is the frequency, bandwidth, modulation mode and other parameters of the UAV communication signal, and the noise signal of the same frequency band or the blocking signal of the same modulation mode is generated based on digital signal processing (DSP), so that accurate frequency band interference can be achieved.

[0060] The interference frequency band corresponding to the first interference signal is the same as the real-time communication frequency band of the UAV to be suppressed, which is used to prevent the UAV communication frequency band from possibly dynamic frequency hopping, and the interference component tracks the target frequency band in real time and adjusts the interference signal frequency to ensure that the interference signal and the target signal overlap in the frequency domain. Prevent the UAV from hopping to a frequency band not covered by the interference component and other interference failure conditions caused by frequency band mismatch. And especially suitable for UAVs with countermeasures and anti-jamming capabilities. The interference component analyzes the interference effect to determine whether the UAV signal strength detected by the receiving unit decreases. Then the judgment result is fed back to the control unit. The control unit is used to control the antenna array and the wideband interference component, and then the control unit controls the mechanical framework to adjust the number of face arrays, change the array gain, and change the suppression signal emission angle, so as to change the suppression beam pointing and realize the UAV prevention and control without dead angle.

[0061] In an embodiment, when the antenna array is driven to suppress the fast-approaching UAV to be suppressed, the angle adjustment speed of the extensible mechanical framework cannot meet the suppression requirements of the UAV to be suppressed, and there is an angle deviation. At this time, the antenna array of the present application increases the number of expanded face arrays through the extensible structure to realize multi-angle suppression.

[0062] In an embodiment, when the antenna array is driven to suppress the fast-approaching UAV to be suppressed, the expansion surface of the extensible mechanical framework increases the interference range, but because the angle cannot be adjusted, there is a suppression blind area on the upper side or lower side of the expansion surface. At this time, the antenna array of the present application adjusts the angle so that there is no detection blind area.

[0063] Embodiment 2:

[0064] The system realizes large-angle measurement function and multi-band function through the following scheme for the expansion of the expandable mechanical frame.

[0065] The expandable mechanical frame has multiple expansion surfaces, the expansion surfaces are provided with standardized slots, and the Vivaldi antenna units are fixed through the standardized slots, and the expansion surfaces are used for one-dimensional or two-dimensional splicing expansion.

[0066] In the present application, the mechanical frame is divided into multiple independent expansion surfaces, each expansion surface is a modular panel structure in the form of a rectangular plane, and each expansion surface can be adjusted or spliced individually to form a larger array structure.

[0067] In an embodiment, through the structure of the expansion surface, the processing difficulty of the frame is reduced by setting the detachable expansion surface in the case of damage of the unmanned aerial vehicle communication link countermeasure system or in the processing process, and the independent repair of a single surface damaged can be realized through the detachable structure of the expansion surface.

[0068] In the present application, the expansion surfaces are provided with standardized slots, so that the Vivaldi antenna units can be fixedly installed in the expandable mechanical frame, and thus can be fixed in the slots in the form of bolts, buckles or welding.

[0069] In an embodiment, the bottom or back of the Vivaldi antenna unit is designed with a threaded connection structure matched with the slot, and the positioning and fixing of the antenna are realized through the mechanical constraint of the slot. One-dimensional or two-dimensional splicing expansion, one-dimensional splicing is to connect the expansion surfaces end to end in the horizontal direction to form a linear array. Two-dimensional splicing means that the expansion surfaces are spliced in the horizontal and vertical directions to form a planar array.

[0070] In an embodiment, the expansion surface is made of aluminum alloy material, the surface is treated by anodic oxidation to improve corrosion resistance, and the slots are distributed in a matrix along the edges and inside of the expansion surface. Each expansion surface includes 4*4 slots.

[0071] In an embodiment, the expansion surface includes two splicing expansion modes, one-dimensional expansion through the standardized slots of the end face abutment, linear splicing through a guide pin and a quick locking wrench; two-dimensional expansion through a 90° corner connector, and through the built-in electrical adapter module and positioning hole to realize planar matrix splicing. After splicing, the system automatically realizes phase compensation through the phase parameter reference source built in the slot. When phase compensation, the phase consistency of multiple expansion surfaces is ensured through the precision 1us GPS timing. When two-dimensional expansion, the system automatically adjusts the beamforming algorithm according to the expansion scale, and offsets the direction distortion caused by mechanical splicing by changing the phase weight of each antenna unit.

[0072] In an embodiment, each slot of the extension surface is in close contact with the heat-conducting silica gel pad through the metal fin, and when the antenna unit is working, the generated heat is conducted to the frame body to achieve natural convection heat dissipation.

[0073] In an embodiment, when the extension operation is performed on multiple extension surfaces, the multi-physical quantity is cooperatively transmitted through the standardized slot, the extension surface changes the array size as needed by using a dynamic splicing mechanism, increases the angle and range of suppressing the unmanned aerial vehicle, and after the extension surface is completed, automatically performs electronic calibration to realize phase compensation, thereby improving the energy efficiency ratio and expanding the countermeasures angle and range of the unmanned aerial vehicle.

[0074] Embodiment 3:

[0075] In the process of the unmanned aerial vehicle countermeasure by the wideband interference assembly of the unmanned aerial vehicle communication link countermeasure system, the main operation is still to determine the communication frequency band of the to-be-suppressed unmanned aerial vehicle, and then to send the same interference frequency band.

[0076] As shown in Figure 2 , the wideband interference assembly includes an interference signal receiving unit and an interference generating unit;

[0077] The interference signal receiving unit is composed of a receiving antenna, a low-noise amplifier and an adjustable band-pass filter, and the receiving antenna is a Vivaldi antenna unit.

[0078] In the present application, the interference signal receiving unit and the interference generating unit are connected through a high-speed data bus to realize real-time data interaction. The signal receiving unit has a three-level cascade architecture. The front end is a receiving antenna using a Vivaldi antenna unit, which is used to receive the communication signal of the to-be-suppressed unmanned aerial vehicle. The middle end uses a low-noise amplifier, which is connected to the Vivaldi antenna unit to amplify the received communication signal of the to-be-suppressed unmanned aerial vehicle (because the distance of the to-be-suppressed unmanned aerial vehicle may be far, a low-noise amplifier is used to amplify the weak signal). The end uses an adjustable band-pass filter, which is connected to the low-noise amplifier to realize accurate screening of the communication frequency band of the to-be-suppressed unmanned aerial vehicle.

[0079] In an embodiment, in the process of countermeasuring the unmanned aerial vehicle, the Vivaldi antenna unit uses a tapered slot structure to have a wideband characteristic, covering the commonly used communication frequency band of the unmanned aerial vehicle. The unmanned aerial vehicle signal collected by the receiving antenna is usually very weak, and the LNA passes through a low-noise coefficient amplification circuit to amplify the signal while minimizing the superposition of its own noise, avoiding the error of spectrum analysis caused by excessive noise. The center frequency and bandwidth of the adjustable band-pass filter can be dynamically adjusted through electrical tuning or mechanical tuning, and only the signal of the target frequency band is allowed to pass, which can avoid the waste of computing resources or misjudgment of the wideband interference assembly caused by receiving redundant signals.

[0080] The interference generating unit comprises a wideband signal generator and a modulator, and is configured to generate a noise signal or a sweep signal; the wideband signal generator is internally provided with a first frequency divider, and the first frequency divider is configured to adjust a real-time frequency band of the wideband signal generated by the wideband signal generator.

[0081] In the present application, the first frequency divider is directly coupled with a local oscillator of the wideband signal generator, the frequency division ratio is dynamically adjusted through the spectrum characteristic data output by the receiving unit, the real-time frequency band of the interference signal is adjusted, and the noise signal or the sweep signal is generated. In this process, the signal receiving unit and the interference generating unit form a closed-loop control link, the receiving unit captures the real-time communication frequency band of the UAV through the tunable band-pass filter, and the captured signal is transmitted to the interference generating unit after being converted into digital signals; the interference generating unit adjusts the output frequency of the wideband signal generator through the first frequency divider according to the received frequency band parameters, the modulator generates the noise or sweep interference signal, and finally the interference signal is radiated through the antenna array to realize the real-time matching of the interference frequency band and the target frequency band.

[0082] In an embodiment, the wideband signal generator can generate a continuous wave signal covering a wide frequency band based on direct digital frequency synthesis or phase-locked loop, and the frequency and amplitude of the continuous wave signal can be accurately adjusted through digital control. The modulator can modulate the continuous wave signal output by the wideband signal generator into a noise signal or a sweep signal (the sweep signal is a signal whose frequency changes linearly with time), which can destroy the demodulation process of the UAV communication link (in this process: the noise signal can drown out the useful signal, and the sweep signal can cover multiple channels of the frequency hopping communication). The frequency divider dynamically adjusts the real-time frequency band of the interference signal by frequency division of the output signal of the wideband signal generator, so that the real-time frequency band of the interference signal is synchronized with the current communication frequency band of the UAV, and the mismatch between the output frequency band of the wideband signal generator and the real-time communication frequency band of the UAV is prevented.

[0083] In an embodiment, in the process of counteracting interference on the UAV to be suppressed, the communication frequency band of the UAV to be suppressed is captured in a frequency hopping tracking manner through the tunable band-pass filter; in this stage, the Vivaldi antenna utilizes the gradually changing slot line to make the current generated by the received communication frequency band of the UAV to be suppressed distributed along the slot line, and in the case that the slot line is different at different parts corresponding to different frequencies, the super wideband signal is received, the received super wideband signal adopts different low noise coefficients under different signal intensities of the UAV to be suppressed, and the weak UAV signal is dynamically amplified, the dynamically amplified signal is tuned through the MEMS capacitor array of the tunable band-pass filter, the control voltage changes the capacitance value, the frequency hopping tracking is realized, and the communication frequency band of the UAV to be suppressed is determined.

[0084] In an embodiment, in the process of counteracting interference to the drone to be suppressed, the interference frequency band is output by the first frequency divider of the interference generation unit. At this stage, there are two cases: the communication frequency band of the drone to be suppressed has been determined, or the communication frequency band of the drone to be suppressed cannot be determined. In the case where the communication frequency band of the drone to be suppressed has been determined, the interference signal is directly sent out through the first frequency divider, and the interference signal is consistent with the communication frequency band of the drone to be suppressed. In this process, if the communication frequency band of the drone to be suppressed changes and the signal strength changes, the interference signal can be sent out in a frequency hopping manner to interfere with the effective signal received by the drone to be suppressed. In the process where the communication frequency band of the drone to be suppressed cannot be determined, a sweep signal is sent out to realize full-band interference, and the first frequency divider functions to perform fast frequency division.

[0085] Embodiment 4:

[0086] The interference generation unit receives the spectrum signal of the drone to be suppressed, adjusts the fundamental frequency of the output signal through the first frequency divider, so that the output frequency band of the wideband signal generator covers the spectrum signal of the drone to be suppressed;

[0087] In the present application, the interference generation unit and the signal receiving unit interact in real time through a high-speed data interface, and then receive the spectrum signal of the drone to be suppressed. The spectrum signal has an analog-to-digital conversion process, and by extracting the center frequency, bandwidth, frequency hopping interval and frequency change characteristics, it is transmitted to the control center of the first frequency divider to realize the spectrum signal analysis of the drone to be suppressed.

[0088] In the process of spectrum signal analysis, the wideband signal generator adjusts the frequency division ratio and the response time to control the output frequency band of the wideband signal generator to cover the spectrum signal of the drone to be suppressed. The original signal output by the wideband signal generator is frequency-divided by the first frequency divider, and the fundamental frequency is dynamically adjusted so that the final output interference frequency band completely overlaps the current communication frequency band of the drone.

[0089] According to the protocol characteristics of the drone to be suppressed, the type of interference signal is determined, wherein,

[0090] If the target drone uses a frequency hopping communication protocol, the modulator generates a sweep signal;

[0091] If the target drone uses a fixed frequency communication protocol, the modulator generates a noise signal.

[0092] In the present application, the identification of the protocol characteristics can be performed after the spectrum signal of the drone to be suppressed. It integrates an FPGA chip for determining the protocol type.

[0093] In an embodiment, the frequency hopping communication protocol is to implement interference by quickly switching the communication frequency in the countermeasure process for the unmanned aerial vehicle to be suppressed, the sweep signal can cover the linear sweep signal of multiple channels of the frequency hopping, and the sweep range covers all frequency bands, which must include the frequency band of the unmanned aerial vehicle to be suppressed, thereby increasing the interference probability; in the interference process, if the interference effect of a certain frequency band is better, the frequency band with the best interference effect can also be used as a fixed frequency interference signal. Therefore, in the process of determining the interference signal, different protocol types are identified according to the frequency hopping communication protocol, including the frequency hopping period, the number of frequency hopping and the randomness of the frequency hopping sequence, to realize frequency hopping.

[0094] In an embodiment, the fixed frequency communication protocol is to make the unmanned aerial vehicle communicate at a single frequency, and the noise signal (wideband random signal) can drown out the useful signal at this frequency to destroy the demodulation process. Therefore, for the fixed frequency communication protocol, the protocol is identified according to the center frequency stability and bandwidth fluctuation, a Gaussian white noise signal is generated, interference is realized, and precise interference is realized according to the interference frequency band.

[0095] In an embodiment, the base frequency adjustment principle of the first frequency divider is to lock the phase of the reference frequency and the output frequency after frequency division through the phase comparator of the phase-locked loop. When the center frequency of the spectrum signal of the unmanned aerial vehicle to be suppressed changes, the control module updates the frequency division ratio in real time to track the change of the output center frequency, and feedback is performed according to the change to determine the interference effect.

[0096] In an embodiment, the present application can automatically interfere with the dynamic spectrum signal according to the frequency division adjustment and the dynamic protocol identification result.

[0097] Embodiment 5:

[0098] In order to make the interference signal have timeliness, the input end of the wideband interference component and the output end of the antenna array of the present application are also connected to a signal processing module.

[0099] The signal processing module includes an analog-to-digital converter, a multi-core DSP processor and a protocol feature database, and the protocol feature database is used to store the time-frequency feature parameters of the unmanned aerial vehicle remote control, image transmission and navigation signal.

[0100] In the present application, the signal processing module serves as the signal hub between the wideband interference component and the antenna array, realizes bidirectional data transmission through a high-speed differential interface, receives the analog spectrum signal output by the antenna array in the uplink, and sends the processed digital feature parameters to the wideband interference component in the downlink, which is used to capture weak unmanned aerial vehicle signals.

[0101] In the present application, the unmanned aerial vehicle communication signal collected by the antenna array is output to the signal processing module through a transmission line, and then input to the wideband interference component after signal preprocessing.

[0102] The analog-to-digital converter converts the continuous time and continuous amplitude analog signals output by the antenna array into digital signals, which retain the time-frequency characteristics of the original signals through sampling and quantization. The DSP processor analyzes the digital signals output by the ADC in real time by executing a digital signal processing algorithm, and extracts the time-frequency characteristics such as frequency, bandwidth, and modulation mode.

[0103] The database pre-stores the time-frequency parameters of remote control, image transmission, and navigation signals of common unmanned aerial vehicle models. In actual implementation, the remote control signal parameters include frequency hopping period, frequency modulation frequency, symbol rate, etc. The image transmission signal parameters include center frequency, bandwidth signal, and frame structure. The navigation signal includes pseudo-code rate, carrier frequency, and data rate.

[0104] In one embodiment, when the system receives the signal of the unmanned aerial vehicle to be suppressed, the signal is input to the analog-to-digital converter to generate a digitized signal, and under the action of the multi-core DSP processor, parallel spectrum analysis is performed to determine the center frequency, bandwidth, and power spectral density of the digitized signal. Then, in combination with the protocol feature database, parameter comparison is performed. In the parameter comparison process, the parameters of the digitized signal form a pattern matching method, and when the matching result is consistent, the signal is directly transmitted to the wideband interference component to dynamically adjust the parameters of the interference signal. In the process of countermeasures, self-feedback interference can be realized, and the entire processing link does not have to parse the processing time delay of the signal of the unmanned aerial vehicle to be suppressed, but realizes adaptive countermeasures based on the same characteristics.

[0105] In one embodiment, during the analog-to-digital conversion process, the analog-to-digital converter ensures that aliasing sampling does not occur when receiving the signal of the unmanned aerial vehicle to be suppressed. Then, under the parallel processing of the DSP, high-speed reading and writing of the distributed protocol feature database is realized. Through parallel processing of the analog-to-digital converter and the signal, different signals received by the antenna unit, i.e., electromagnetic interference between different expansion surfaces, are prevented, and the signals between the separated expansion surfaces are separated.

[0106] Embodiment 6:

[0107] The receiving unit, in response to the spectrum signal of the unmanned aerial vehicle to be suppressed, further includes:

[0108] The received spectrum signal is input to a low-noise amplifier for primary amplification, and the amplified signal is input to an adjustable bandpass filter for preliminary filtering to generate a first signal.

[0109] In the present application, the receiving unit judges the spectrum signal of the unmanned aerial vehicle to be suppressed in response to the spectrum signal of the unmanned aerial vehicle to be suppressed, amplifies the input spectrum signal through a low-noise amplifier, and in the amplification process, temperature compensation is usually performed through a bias circuit. The amplified signal is continuously adjustable through an adjustable band-pass filter. In this process, the MEMS capacitor array tuning mechanism of the adjustable band-pass filter is used to continuously adjust the spectrum, and the multi-core DSP processor is used for dynamic tracking of the spectrum to determine the first signal after preliminary filtering of the unmanned aerial vehicle to be suppressed.

[0110] In the present application, the low-noise amplifier uses a low-noise coefficient amplification circuit to amplify weak received signals while minimizing the superposition of its own noise; the tunable band-pass filter (TBPF) dynamically adjusts the passband range through electrical tuning (varactor diode) to allow only signals in the unmanned aerial vehicle communication frequency band to pass through and filter out other frequency band noise (such as Bluetooth and Wi-Fi signals).

[0111] In one embodiment, in the process of capturing the unmanned aerial vehicle signal to be suppressed through low-noise amplification and tunable band-pass filtering, the low-noise amplifier uses two-dimensional electron gas to achieve high mobility and low noise characteristics. Then, based on the MEMS capacitor array, voltage is applied to change the capacitance value and adjust the resonance frequency, forming a collaborative impedance matching network to reduce loss while capturing the unmanned aerial vehicle signal.

[0112] After the first signal is converted into a target digital signal by the analog-to-digital converter, the multi-core DSP processor calls the time-frequency characteristic parameters stored in the protocol feature database for time-frequency analysis and feature matching with the target digital signal;

[0113] In the present application, the first signal after conditioning is converted into a target digital signal by an analog-to-digital converter, and the target digital signal collects the communication signal of the unmanned aerial vehicle to be suppressed. Through the parallel channels of the multi-core DSP processor, parallel processing of time-frequency analysis and feature matching is performed, and time-frequency feature extraction and time-frequency feature matching of the spectrum signal (communication signal) of the unmanned aerial vehicle to be suppressed are performed.

[0114] In the present application, the ADC converts the analog signal into a digital signal (discrete time, discrete amplitude) through sampling and quantization, preserving the time-frequency characteristics (such as frequency, bandwidth, modulation method) of the original signal; the multi-core DSP processor performs parallel time-frequency analysis algorithm to match the extracted real-time features with the templates in the protocol feature database.

[0115] In an embodiment, the multi-core DSP processor allocates one channel to time-frequency analysis, one channel to feature extraction, and one channel to database matching in parallel processing, each channel having a corresponding independent processing core. The results of different channels can call each other, so that when determining the spectrum signal of the drone to be suppressed, multiple signals can be processed simultaneously, the multiple signals directly generate interference signals, and the multiple signals can verify and cooperate with each other, thereby improving the analysis rate of the interference signal and the generation rate of the countermeasure signal.

[0116] If the characteristic parameters of the drone to be suppressed are matched, the multi-core DSP processor extracts the real-time communication frequency band of the drone to be suppressed, generates a first control instruction including a first interference signal, and the first control instruction includes an unfolding instruction of the expandable mechanical framework.

[0117] In the present application, after the feature matching is successful, the multi-core DSP processor extracts the real-time communication frequency band of the drone to be suppressed to generate a first control instruction. The first control instruction is used to output the interference signal parameters of the first interference signal to generate the first interference signal and generate an unfolding instruction of the expandable mechanical framework. Then the first control instruction is transmitted to the wideband interference component and the mechanical control unit for output.

[0118] In the present application, after the feature matching is successful, the multi-core DSP processor extracts the real-time communication frequency band of the drone to be suppressed to generate a first control instruction. The first control instruction is used to output the interference signal parameters of the first interference signal to generate the first interference signal and generate an unfolding instruction of the expandable mechanical framework. Then the first control instruction is transmitted to the wideband interference component and the mechanical control unit for output.

[0119] In an embodiment, the time-frequency parameters stored in the protocol feature database are matched by setting a dynamic tolerance threshold, and the cosine similarity of the input signal vector and the template vector in the library is calculated to determine the success of the matching, thereby realizing the generation of the drone suppression signal. The generated suppression signal is consistent with the communication signal of the drone in the time domain feature, which prevents the error of the spectrum signal acquisition of the drone to be suppressed, and directly generates the suppression signal based on the feature matching, rather than completely analyzing the signal of the drone to be suppressed to generate the suppression signal, thereby improving the suppression efficiency of the drone.

[0120] Embodiment 7:

[0121] The unfolding instruction includes the number of unfolded expansion surfaces and the unfolding angle.

[0122] In the present application, the deployment instruction is used to output the signal of the number of deployed expansion surfaces and the deployment angle of each expansion surface. The process is important: the DSP processor calculates the optimal number of expansion surfaces and angles required according to the real-time communication frequency band of the unmanned aerial vehicle and the interference demand, generates a deployment instruction containing the two parameters, and the expansion mechanism (such as a stepping motor driven guide rail) of the mechanical frame is started only when the target number of expansion surfaces is greater than the current number (such as the first two expansion surfaces, the target is four, and the trigger is triggered; the target is two, and the trigger is not triggered), and the current number of expansion surfaces is monitored in real time through a sensor (position encoder).

[0123] In an embodiment, when the multi-core DSP processor is in the process of generating a feedback signal, the working state of the number of deployed expansion surfaces is monitored in real time, and when the number of deployed expansion surfaces exceeds the current number of deployed expansion surfaces, the standby expansion surface with the optimal state is preferentially called. The control instruction containing the expansion surface ID and the splicing dimension (one-dimensional / two-dimensional) is sent through the CAN bus to realize the expansion response in seconds.

[0124] If the number of deployed expansion surfaces exceeds the current number of deployed expansion surfaces, the expansion mechanism of the mechanical frame is triggered, and the standby expansion surface is expanded and fixed through one-dimensional or two-dimensional splicing;

[0125] In the present application, when the number of expansion surfaces required to be deployed in the instruction exceeds the current number of deployed expansion surfaces, the DSP processor sends a trigger signal to the mechanical control unit through the CAN bus to activate the expansion mechanism, and the expansion operation is performed through the pushing device and the guiding and positioning device of each expansion surface. The guiding and positioning device includes a cross guide rail. In the expansion process, one-dimensional splicing uses a linear guide rail and an electromagnetic positioning pin in cooperation, and a double guide rail slider is installed at the bottom of the expansion surface to realize splicing positioning. Two-dimensional expansion splicing increases the pitch adjustment joint on the basis of one-dimensional splicing to realize rotation around the horizontal axis, improve the deployment angle, and at the same time, the joint of the expansion surface inherits the torque sensor to realize stress detection of splicing. One-dimensional splicing means that the standby expansion surface is linearly expanded in a single direction (such as the horizontal direction) (such as splicing from left to right in sequence), which is suitable for scenarios that require to increase the length of the antenna array (to improve the horizontal direction gain); two-dimensional splicing means that the standby expansion surface is expanded in the horizontal and vertical directions at the same time (such as forming a rectangular array), which is suitable for scenarios that require to increase the antenna aperture (to improve the three-dimensional space gain).

[0126] In an embodiment, in the process of one-dimensional / two-dimensional splicing, one-dimensional splicing only needs a guide rail to perform parallel guiding expansion, and two-dimensional splicing is to increase the pitch joint on the basis of one-dimensional splicing, and through the feedback of the worm gear transmission and the torque sensor, the joint pre-tightening is adjusted in real time, so as to realize angle expansion under the condition of structure deformation, and realize beamforming of wideband interference.

[0127] When the standby extension surface is unfolded and fixed, the included angle between each extension surface and the horizontal plane is determined according to the unfolding angle.

[0128] In the present application, after the extension surface is unfolded and fixed, a multi-stage fixing process is triggered. The electromagnetic locking structure is locked. The mechanical bolt is locked, or the vacuum adsorption is locked, and the three fixing modes ensure that the extension surface will not vibrate. In the extension surface number fixing control, after the extension surface is fixed, the DSP drives the motor of each extension surface to adjust the included angle with the horizontal plane according to the mapping relationship between the target frequency band and the unfolding angle. Real-time feedback is performed through the inclination sensor during the adjustment process to realize closed-loop control. After unfolding and fixing, the included angle between each extension surface and the horizontal plane is determined, which represents that each extension surface of the mechanical frame adjusts the included angle with the horizontal plane through the angle adjustment mechanism. The angle value is calculated by the DSP processor according to the flight height of the unmanned aerial vehicle and the communication link direction.

[0129] In one embodiment, during unfolding and fixing, one-dimensional linear splicing preferably uses electromagnetic locking, two-dimensional splicing uses mechanical bolt and vacuum adsorption to form redundant fixing, realizes three-dimensional unfolding and fixing, and is more accurate in angle control. The target frequency band switching of directional gain is more rapid.

[0130] Embodiment 8:

[0131] The power module includes a first AC conversion circuit, a constant current loop unit, and a first MOS tube;

[0132] In the present application, the dynamic current regulation of the power module is mainly realized by suppressing conducted interference through the first AC conversion circuit, adjusting the target current through the constant current loop power supply, and controlling the conduction of the first MOS tube. After the wideband interference component obtains the communication frequency band to be suppressed of the unmanned aerial vehicle, the frequency band code is sent to the constant current loop unit through the SPI interface. The constant current loop queries the mapping table to determine the target current, generates a reference voltage, and makes the actual current of the interference signal match the target current to realize suppression. The interference signal output of the frequency hopping signal can be realized.

[0133] In one embodiment, the first AC conversion circuit converts external alternating current into stable direct current. Through rectification (such as bridge rectification), filtering (such as capacitor filtering), and voltage stabilization (such as three-terminal voltage stabilizer) circuits, clean direct current power is provided for the subsequent constant current loop unit.

[0134] The input end of the constant current loop unit is connected to the output end of the first AC conversion circuit, and the other input end of the constant current loop unit is connected to the wideband interference component, and the target current of the interference frequency band corresponding to the first interference signal is determined.

[0135] In the present application, the first AC conversion circuit adopts a flyback topology structure, and the rectified direct current is isolated and stepped down through a high-frequency transformer. The PWM controller adjusts the duty cycle, and the output end integrates a common-mode inductor and a capacitor to realize suppression of conducted interference. The main input end of the constant current loop unit is connected to the power supply output end of the first AC conversion circuit, and the other input end receives the interference frequency band signal of the wideband interference assembly through an SPI interface. The target interference current is determined through a pre-stored frequency band and current mapping table, and a current adjustment signal is output.

[0136] In an embodiment, the input end of the constant current loop unit receives two signals, the direct current output of the first AC conversion circuit as a power supply, and the interference frequency band signal output by the wideband interference assembly, which has a mapping relationship with the interference frequency band (for example, the higher the voltage, the greater the current required by the corresponding frequency band). The actual input current of the antenna array is sampled through a current detection resistor, compared with the target current, and the output voltage is adjusted through a proportional-integral-derivative control algorithm to make the actual current track the target current, which can also prevent power fluctuations caused by impedance changes.

[0137] The output end of the constant current loop unit is connected to the power supply end of the antenna array through the source of the first MOS tube, and controls the input current of the antenna array to be the target current.

[0138] In the present application, the source of the first MOS tube is connected to the output end of the constant current loop unit, and the drain is connected to the power supply end of the antenna array through an LC filter circuit. The gate receives the PWM driving signal of the constant current loop, and adjusts the conduction degree in real time through closed-loop feedback to ensure that the input current of the antenna array is stable at the target current value.

[0139] In an embodiment, the first MOS tube serves as a current control execution element, with its source connected to the power supply end of the antenna array, its drain connected to the output end of the constant current loop unit, and its gate receiving the control voltage of the constant current loop unit. By adjusting the gate voltage, the on-resistance of the MOS tube is changed, thereby adjusting the input current of the antenna array.

[0140] In an embodiment, the constant current loop unit takes the interference frequency band signal output by the wideband interference assembly as an input variable, converts the radio frequency parameter into a power control parameter through a pre-stored mapping table, and actively adjusts based on the constant current loop, so that the current and the frequency band are bound, realizing stable output of the interference signal, i.e., the countermeasure signal. In this process, the first MOS tube serves as a power regulation element, dynamically adjusts the on-resistance through the duty cycle of the gate PWM signal, and forms a current closed-loop feedback with the sampling resistor. In the process of switching the interference frequency band, the current quickly tracks the target value, realizing dynamic real-time current regulation.

[0141] Embodiment 9:

[0142] The constant current loop unit converts external alternating current into stable direct current through the first AC conversion circuit, and inputs the stable direct current into a current control end of the constant current loop unit;

[0143] In the present application, external alternating current is processed through the first AC conversion circuit, and under a flyback topology, the duty cycle is adjusted through a PWM controller to output stable direct current; the stable direct current is input into the current control end of the constant current loop unit to realize stable current output, reduce loss, and stabilize the current. The constant current loop unit receives a target current instruction of the wideband interference component through an SPI interface. The MCU converts the target current into a reference voltage and compares it with a feedback voltage of a sampling resistor, and after being amplified by an error amplifier, a PWM control signal is generated, which is transmitted to the gate of the first MOS tube through an optical coupler to ensure electrical isolation.

[0144] In one embodiment, external alternating current is converted into stable direct current through the first AC conversion circuit (including a rectifier bridge, a filter capacitor, a voltage stabilizing chip, etc.). The rectifier bridge converts alternating current into pulsating direct current, the filter capacitor smooths the voltage ripple, and the voltage stabilizing chip adjusts the output voltage through negative feedback to offset the influence of input voltage fluctuation. The controller inside the constant current loop unit generates a control signal proportional to the target current through a current-voltage conversion circuit (such as an I / V converter).

[0145] In one embodiment, the AC conversion output is directly connected to the current control end of the constant current loop, the response time is shortened through synchronous timing control, and frequency hopping interference can be realized.

[0146] In one embodiment, the constant current loop unit realizes linear mapping of the MOS tube conduction duty cycle and the target current through a feedback link of the PWM signal output by the reference voltage, sampling feedback, and error amplification. When the input voltage fluctuates or the impedance of the antenna unit changes, the current change is automatically responded to, and automatic feedback adjustment is realized to ensure stability.

[0147] According to the target current, a current control signal is generated and transmitted to the gate of the first MOS tube, and the current flowing through the source of the first MOS tube is stabilized to the target current by adjusting the conduction duty cycle of the first MOS tube; wherein the stabilized current is transmitted to each Vivaldi antenna unit of the antenna array through the power supply circuit.

[0148] In the present application, the first MOS transistor is an N-channel power MOS transistor, and after receiving the PWM signal, the gate drive circuit adjusts the conduction degree. When the target current changes, the PWM duty cycle increases or decreases linearly, the MOS transistor conduction resistance decreases, the source current is corrected in real time through closed-loop feedback, the overshoot is adjusted, and the current is stabilized. The stabilized target current is transmitted to each Vivaldi antenna unit of the antenna array through the multi-branch power supply line to realize the output of the countermeasure signal.

[0149] In an embodiment, the control signal is transmitted to the gate of the first MOS transistor through the drive circuit (gate driver) as the basis for adjusting the conduction state of the MOS transistor. The conduction duty cycle (D) of the MOS transistor refers to the ratio of the conduction time to the total cycle in a switching period. The constant current loop unit adjusts D (such as increasing D to increase the average current when the target current increases) to use the switching characteristics of the MOS transistor (the resistance is close to 0 when conducting, and the resistance is extremely large when cut off) to chop the stable direct current into pulsed direct current, and after smoothing by the output filter inductor, a stable direct current with an average current equal to the target current is obtained. The power supply line (such as a multi-core shielded cable) distributes the stable current output by the constant current loop unit to each Vivaldi antenna unit of the antenna array. When designing the line, impedance matching needs to be considered to avoid voltage drop due to line impedance during transmission, affecting the consistency of the unit current, while ensuring the beamforming accuracy of the antenna array.

[0150] Embodiment 10:

[0151] As shown in Figure 3 The wideband interference assembly further includes a monitoring assembly for collecting the antenna state of the antenna array under the first interference signal. If it is detected that more than a threshold number of antenna units in any expansion surface of the expandable mechanical frame are in a fault state, the expansion surface is marked as a fault surface, and a fault alarm signal is generated. The expandable mechanical frame is an actuator, and the signal processing module generates an angle adjustment instruction for the expansion surface adjacent to the fault surface. The expandable mechanical frame performs adjustment operations according to the instruction.

[0152] In the present application, the monitoring assembly collects the antenna state of the antenna array in real time, determines the expansion surface fault by pre-storing the antenna unit layout mapping table of each expansion surface and setting the unit fault threshold, records the fault number of the expansion surface, and sends a fault alarm signal to the mechanical frame controller through the CAN bus. The expandable mechanical frame of the present application adopts a multi-expansion surface modular design, and each expansion surface is controlled by an independent motor. After receiving the fault alarm signal, the adjustment of the adjacent expansion surface is realized through the linkage of the fault surface and the adjacent surface.

[0153] In an embodiment, the monitoring component collects signals in real time through sensors integrated on the antenna units. For example, a standing wave ratio sensor detects the ratio of reflected power to incident power through a directional coupler, and a power detection chip converts radio frequency power into a voltage signal through a logarithmic amplifier. The monitoring component transmits the collected antenna state data to the controller, which compares the data with preset thresholds. If the number of faulty units in an expansion surface exceeds the threshold, the expansion surface is marked as a faulty surface, and a fault alarm signal is generated through the communication module. The expandable mechanical frame responds to the fault alarm signal and generates an angle adjustment operation for the adjacent expansion surface of the faulty surface, and when the angle adjustment operation is performed, and the interference range of the suppressed UAV is different from the expected interference range, the redundant expansion mechanism of the expandable mechanical frame is triggered.

[0154] In this application, after the angle adjustment, the monitoring component evaluates the interference range by collecting the effective radiation power of the interference signal in real time, and when the adjusted interference range is different from the expected value, the redundant expansion mechanism is triggered. The controller sends an unlocking instruction to the redundant expansion surface, and the redundant surface is expanded to a preset angle through a synchronous belt transmission mechanism. The broadband interference component synchronizes the interference signal parameters of the faulty surface to the redundant surface, realizing seamless connection of the interference range.

[0155] In an embodiment, after the drive module of the expandable mechanical frame receives the fault alarm signal, the adjustment angle (such as 30° to 45°) of the adjacent expansion surface (such as expansion surfaces B and C) of the faulty surface (such as expansion surface A) is calculated. The adjustment is realized through a rotating hinge (a rotating shaft driven by a stepper motor), and the angle value is determined by the controller according to the antenna array pattern simulation results. After the angle adjustment, the monitoring component compares the actual interference range (such as the signal strength attenuation value of the UAV communication link) with the expected range, and if the deviation exceeds the threshold, the controller triggers the redundant expansion mechanism: calls the expansion mechanism (such as an electric push rod) of the mechanical frame to expand the standby expansion surface, and after one-dimensional / two-dimensional splicing is fixed, the antenna array pattern is recalculated to restore the expected interference range.

[0156] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A Vivaldi antenna based UAV communication link countermeasure system, characterized in that, The utility model relates to a kind of unmanned aerial vehicle interference device, including: Antenna array, including signal receiving unit and signal transmitting unit;Wherein, antenna array is fixed in scalable mechanical frame by at least two groups of staggered arrangement Vivaldi antenna unit; Wideband interference component, for responding the spectrum signal of the unmanned aerial vehicle to be suppressed by receiving unit, and generating first interference signal;Wherein, the interference frequency band corresponding to first interference signal is same with the real-time communication frequency band of the unmanned aerial vehicle to be suppressed, scalable mechanical frame is used to respond first interference signal, and the adjustment of the number and angle of scalable mechanical frame's expanded surface array is executed; The power supply end of antenna array and wideband interference component is electrically connected with power module; The input end of wideband interference component and the output end of antenna array are also connected with signal processing module; Wherein, signal processing module is composed of analog-digital converter, multi-core DSP processor and protocol feature database, and protocol feature database is used to store the time-frequency characteristic parameter of unmanned aerial vehicle remote control, image transmission and navigation signal; When receiving unit responds the spectrum signal of the unmanned aerial vehicle to be suppressed, it also includes: Input received spectrum signal into low noise amplifier for primary amplification, and the signal after amplification enters tunable band-pass filter for preliminary filtering, to generate first signal; After converting first signal into target digital signal by analog-digital converter, call the time-frequency characteristic parameter stored in protocol feature database by multi-core DSP processor to carry out time-frequency analysis and feature matching with target digital signal; Wherein, if the characteristic parameter of the unmanned aerial vehicle to be suppressed is matched, then DSP processor extracts the real-time communication frequency band of the unmanned aerial vehicle to be suppressed, generates first control instruction including first interference signal, and first control instruction includes the expansion instruction of scalable mechanical frame; The expansion instruction includes expansion surface number and expansion angle; Wherein, if expansion surface number exceeds the number of currently deployed expansion surface, then trigger the expansion mechanism of mechanical frame, and expand and fix spare expansion surface by one-dimensional or two-dimensional splicing mode; After spare expansion surface is expanded and fixed, determine the included angle of each expansion surface with horizontal plane according to expansion angle.

2. The Vivaldi antenna based UAV communication link countermeasure system of claim 1, wherein, The scalable mechanical frame has multiple expansion surfaces, and the expansion surfaces are provided with standardized slots, and the Vivaldi antenna units are fixed in the standardized slots, and the expansion surfaces are used for one-dimensional or two-dimensional splicing expansion.

3. The Vivaldi antenna based UAV communication link countermeasure system of claim 1, wherein, The wideband interference component includes interference signal receiving unit and interference generating unit; The interference signal receiving unit is composed of receiving antenna, low noise amplifier and tunable band-pass filter, and the receiving antenna is Vivaldi antenna unit; The interference generating unit includes wideband signal generator and modulator, for generating noise signal or sweep signal;Wherein, the first frequency divider is built in wideband signal generator, and the first frequency divider is used to adjust the real-time frequency band of wideband signal generator output wideband signal.

4. A Vivaldi antenna based UAV communication link countermeasure system as claimed in claim 3, wherein, When interference generating unit receives the spectrum signal of the unmanned aerial vehicle to be suppressed, adjust the fundamental frequency of output signal by first frequency divider, so that the output frequency band of wideband signal generator covers the spectrum signal of the unmanned aerial vehicle to be suppressed; And according to the protocol feature of the unmanned aerial vehicle to be suppressed, determine the type of interference signal: wherein, If the target unmanned aerial vehicle uses frequency hopping communication protocol, then modulator generates sweep signal. If the target UAV uses a fixed frequency communication protocol, the modulator generates a noise signal.

5. The Vivaldi antenna based UAV communication link countermeasure system of claim 1, wherein, The power module comprises a first AC conversion circuit, a constant current loop unit and a first MOS tube; The input end of the constant current loop unit is connected to the output end of the first AC conversion circuit, and the other input end of the constant current loop unit is connected to the wideband interference component, and the target current of the interference frequency band corresponding to the first interference signal is determined. The output end of the constant current loop unit is connected to the power supply end of the antenna array through the source of the first MOS tube, so that the input current of the antenna array is the target current.

6. A Vivaldi antenna based UAV communication link countermeasure system as claimed in claim 5, wherein, The constant current loop unit converts external alternating current into stable direct current through the first AC conversion circuit, and inputs the stable direct current into the current control end of the constant current loop unit. The current control signal is generated according to the target current and transmitted to the gate of the first MOS tube, and the on-duty ratio of the first MOS tube is adjusted to stabilize the current flowing through the source of the first MOS tube to the target current; wherein the stabilized current is transmitted to each Vivaldi antenna unit of the antenna array through the power supply circuit.

7. A Vivaldi antenna based UAV communication link countermeasure system as claimed in claim 1, wherein, The wideband interference component further comprises a monitoring component for collecting the antenna state of the antenna array under the first interference signal, wherein if more than a threshold number of antenna units in any expansion surface of the expandable mechanical frame are in a fault state, the expansion surface is marked as a fault surface, and a fault alarm signal is generated. The expandable mechanical frame responds to the fault alarm signal and generates an angle adjustment operation of the adjacent expansion surface of the fault surface, and when the angle adjustment operation is performed, and the interference range of the to-be-suppressed UAV is different from the expected interference range, the redundant expansion mechanism of the expandable mechanical frame is triggered.

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