Ultra-wide-band and large-scanning-angle Vivaldi antenna array for unmanned aerial vehicle countering

Abstract

The invention relates to the technical field of antennas, and provides an ultra-wide-band and large-scanning-angle Vivaldi antenna array for unmanned aerial vehicle countering, which comprises double-sided Vivaldi antenna units of a staggered array structure, and the double-sided Vivaldi antenna units are electrically connected with a broadband circuit control module; the broadband circuit control module comprises a broadband feed network, a T / R assembly and a beam control unit. The tail end of the broadband feed network is directly coupled with the double-sided Vivaldi antenna unit; wherein the double-sided Vivaldi antenna unit responds to a broadband signal distribution instruction of the broadband feed network; a radio frequency output end of the T / R assembly is connected with a power dividing port of the broadband feed network, and a radio frequency input end of the T / R assembly is connected with a combining port of the broadband feed network; the beam control unit is electrically connected with the control end of the T / R assembly through a high-speed serial control bus; wherein the T / R assembly responds to a control instruction of the beam control unit, and the control instruction comprises an orientation instruction and a frequency band instruction.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of unmanned aerial vehicle antennas, in particular to a super-wideband and wide-scanning-angle Vivaldi antenna array for unmanned aerial vehicle countermeasures. BACKGROUND

[0002] The Vivaldi antenna array is a phased array system based on Vivaldi antenna units, has the characteristics of super-wideband, wide-angle scanning, high gain and structural flexibility, and is widely used in the fields of radar, communication, electronic countermeasures and the like.

[0003] The conventional Vivaldi array is arranged in a uniform manner (row and column alignment), and the scanning angle is limited by grating lobes (usually <±45°).

[0004] The control module of the existing wideband antenna is a simple combination of a "feed network + T / R component", and a beam control unit is not integrated to simultaneously output azimuth and frequency band composite instructions. SUMMARY

[0005] The application provides a super-wideband and wide-scanning-angle Vivaldi antenna array for unmanned aerial vehicle countermeasures, and coordinates the phase (azimuth) and gain / attenuation (frequency band) of the T / R component through the beam control unit, thereby solving the problem of coordinated control of multi-frequency signal distribution and wide-scanning-angle beam pointing under super-wideband.

[0006] In a first aspect, the application provides a super-wideband and wide-scanning-angle Vivaldi antenna array for unmanned aerial vehicle countermeasures, comprising double-sided Vivaldi antenna units arranged in an interleaved array structure, wherein: The double-sided Vivaldi antenna units are electrically connected to a wideband circuit control module; wherein the wideband circuit control module comprises a wideband feed network, a T / R component and a beam control unit; The end of the wideband feed network is directly coupled to the double-sided Vivaldi antenna units; wherein the double-sided Vivaldi antenna units respond to the wideband signal distribution instructions of the wideband feed network; The radio frequency output end of the T / R component is connected to the power division port of the wideband feed network, and the radio frequency input end of the T / R component is connected to the combining port of the wideband feed network; The beam control unit is electrically connected to the control end of the T / R component through a high-speed serial control bus; wherein the T / R component responds to the control instructions of the beam control unit, and the control instructions include azimuth instructions and frequency band instructions.

[0007] In combination with the first aspect, the wideband feed network comprises a plurality of impedance transformation power dividers; The multi-section impedance transformation power divider is used for dynamically responding to at least one frequency band distribution signal output by the T / R component.

[0008] In combination with the first aspect, the wideband feed network is configured to respond to a frequency band instruction; When the wideband feed network receives a first control instruction containing target frequency band information sent by the beam control unit through the high-speed serial control bus, the first control instruction is parsed, and a frequency band range parameter is determined, which corresponds to power divider impedance transformation section parameters and signal distribution ratios. Verify whether the current double-sided Vivaldi antenna unit meets the operating bandwidth constraint condition; If the verification is passed, the impedance transformation section of the multi-section impedance transformation power divider is switched to the parameter configuration of any frequency band within the frequency band range parameter, and the adjustment of the signal distribution ratio is completed. If the verification is not passed, the wideband feed network ignores the first control instruction.

[0009] In combination with the first aspect, the T / R component includes a high-frequency coaxial connector; When the high-frequency coaxial connector responds to the first signal of the wideband feed network, the phase shift parameter and the attenuation parameter are determined, and the frequency band distribution signal is generated according to the phase shift parameter and the attenuation parameter; wherein the first signal is a transmission signal; When the high-frequency coaxial connector responds to the second signal of the wideband feed network, the phase difference of different signals is determined, and the target signal is synthesized according to the phase difference; wherein the second signal is a receiving signal.

[0010] In combination with the first aspect, the T / R component is configured with a phase calibration judgment mechanism; When the azimuth instruction of the receiving beam control unit is received, the control module parses the target azimuth angle, retrieves the array geometry parameter to calculate the channel phase quantity, and queries the adjustable range of the phase shifter. If the phase quantity exceeds the range, set the extreme value and generate a warning, otherwise directly set the phase value.

[0011] In combination with the first aspect, the beam control unit includes a first unit and a second unit; wherein the first unit is used to generate a phase shift amount instruction of the T / R component response according to the operating frequency; the second unit is used to receive the phase shift amount of the T / R component, determine the target weighting parameter of the wideband feed network under the target angle, and generate a linear phase gradient instruction fed back to the T / R component according to the target weighting parameter.

[0012] In combination with the first aspect, the target weighting parameter is determined by a Taylor amplitude weighting mechanism deployed in the beam control unit; wherein the Taylor amplitude weighting mechanism generates an amplitude weighting model at a target angle based on a difference between a real-time sidelobe level of the double-sided Vivaldi antenna unit and a preset sidelobe level and a minimum value of an equal-sidelobe number of the real-time double-sided Vivaldi antenna unit, the amplitude weighting model including a first amplitude weighting of an unequal power divider under a received signal and a second amplitude weighting of a variable gain amplifier under a transmitted signal.

[0013] In combination with the first aspect, the Taylor amplitude weighting mechanism is further configured to: When receiving a sidelobe suppression instruction of the beam control unit, analyze the weighting type, call the weighting-amplitude coefficient table to calculate the amplitude value and the attenuation amount of each channel, and query the adjustable range of the attenuator; If the attenuation amount exceeds the range, set an extreme value and generate a warning, otherwise directly set the attenuation value.

[0014] In combination with the first aspect, the beam control unit is configured with a control instruction generation judgment mechanism; After receiving target data of a target device, analyze the target azimuth angle and frequency, call the scanning range and bandwidth constraint verification; If the azimuth angle exceeds the range, correct it to a boundary value, and if the frequency exceeds the range, ignore it and generate an error log; Otherwise, generate a corresponding azimuth and frequency band instruction and send it to the T / R component.

[0015] In combination with the first aspect, the different components of the T / R component are clock-synchronized, and the beam control unit periodically reads the channel phase and amplitude state of each T / R component, calculates the average deviation and verifies whether it exceeds a preset threshold; If the threshold is exceeded, generate a correction instruction and send it to the corresponding T / R component, otherwise maintain the state.

[0016] The application has the following advantages: The application uses double-sided Vivaldi antenna units arranged in staggered rows, which destroys the array periodicity to suppress grating lobes, enhances the radiation efficiency in combination with the double-sided radiation structure, and realizes signal transmission with a large scanning angle. The wideband feed network is directly coupled with the antenna unit to reduce insertion loss, and in combination with the T / R component and the beam control unit, through azimuth / frequency band instruction control, it realizes the coordinated control of ultra-wideband multi-frequency band signal distribution and large scanning angle beam pointing, and improves the efficiency of unmanned aerial vehicle countermeasures and unmanned aerial vehicle equipment multi-direction, multi-frequency band target detection and interference.

[0017] Additional features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The objectives and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0018] The technical solutions of the present application are described in further detail below with the aid of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and are used to explain the present application, but do not limit the present application.

[0020] In the drawings: Figure 1 is a constituent structure diagram of a wideband circuit control module in an embodiment of the present application; Figure 2 is a constituent structure diagram of a wideband circuit control module in an embodiment of the present application; Figure 3 is a control logic diagram of a wideband circuit control module in an embodiment of the present application.

[0021] Reference signs: 10 is a double-sided Vivaldi antenna unit, 20 is a wideband circuit control module, 203 is a wideband feed network, 202 is a T / R component, and 201 is a beam control unit. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present application are described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and do not limit the present application.

[0023] In the prior art, conventional Vivaldi arrays are usually arranged uniformly, i.e., in a row-column alignment manner. Therefore, the scanning angle is limited by grating lobes, and in a conventional case, the adjustment range is only 90°, ±45°. The present application breaks the array periodicity by staggered arrangement, suppresses grating lobes, and expands the scanning angle to ±60°. The array structure is improved, which is different from the Vivaldi array on the market, which only suppresses grating lobes by reducing the unit spacing, but causes the bandwidth to deteriorate. The staggered arrangement is a structural improvement independent of the spacing.

[0024] The present application proposes a wideband, large scanning angle Vivaldi antenna array for anti-UAV, as shown in Figure 3As shown, the deployment of the Vivaldi antenna array grating lobes, each antenna will exist multiple three-dimensional layout grating lobes. Grating lobe is a kind of composite dielectric plate, dielectric plate one side layout circular resonant cavity and exponential fan-shaped slot. The other side of the dielectric plate is arranged microstrip transmission line and fan-shaped stub, realize radiation control. In order to enhance the direction of the guide, the fan-shaped slot inside can also be provided with guide bar.

[0025] Embodiment 1: Referring to Figure 1 and Figure 2 , the application proposes a kind of for unmanned plane countermeasure ultra-wideband, big scanning angle Vivaldi antenna array, including the staggered arrangement array structure double-sided Vivaldi antenna unit 10.

[0026] In the present application, the staggered arrangement array structure double-sided Vivaldi antenna unit 10, on the radiation surface of grating lobe, adopt double-sided metal radiation surface symmetrical distribution, so that transverse offset greater than λ / 4 staggered interval, λ it indicates lower limit of working wavelength, transverse dislocation half unit period The way optimizes inter-element electromagnetic coupling, suppresses the mutual coupling interference when scanning, so that adjacent unit electromagnetic coupling is reduced, reduces the distortion of radiation pattern. Compared with the single-sided Vivaldi antenna unit widely used in market, scanning angle is expanded by 30%, so as to reach wideband without reducing response speed.

[0027] Double-sided Vivaldi antenna unit 10 is electrically connected with wideband circuit control module 20;Wherein, wideband circuit control module 20 includes wideband feed network 203, T / R component 202 and beam control unit 201; In one embodiment, Vivaldi antenna is a tapered slot line structure, naturally has ultra-wideband characteristics;Double-sided structure (upper and lower two metal patches) can enhance radiation efficiency and expand bandwidth;Staggered arrangement (such as row and column offset half unit spacing) can realize ultra-wideband signal coverage and large scanning angle by destroying array periodicity, suppressing grating lobe (grating lobe will cause radiation pattern deterioration, limit scanning angle) when scanning, meet the needs of multi-direction, multi-frequency target detection in unmanned plane countermeasure.

[0028] The end of wideband feed network 203 is directly coupled with double-sided Vivaldi antenna unit 10;Wherein, double-sided Vivaldi antenna unit 10 responds to the wideband signal distribution instruction of wideband feed network 203; In the present application, the wideband circuit control module 20 is directly coupled with the double-sided Vivaldi antenna unit 10, so that the end of the formed feeding network and the throat of the antenna unit are realized energy transmission through electromagnetic coupling, without the need for traditional cables or connectors, reducing the transmission loss caused by traditional cables or connectors. Therefore, when receiving the wideband signal distribution instruction, it is more rapid. The wideband circuit control module 20 is used for efficient distribution and transceiving of wideband signals, dynamic beam scanning (large scanning angle) and multi-band adaptation (ultra-wideband), solving the defect that the loss of the wideband feeding network 203 in the traditional antenna increases sharply with the increase of the scanning angle, and simultaneously realizing wideband and large scanning angle. The distribution instruction is used to distribute different powers and scan different azimuth angles.

[0029] In an embodiment, the radio frequency output end of the T / R component 202 is connected with the power division port of the wideband feeding network 203, and the radio frequency input end of the T / R component 202 is connected with the combining port of the wideband feeding network 203. In the present application, the radio frequency output end of the T / R component 202 is connected with the power division port of the wideband feeding network 203, so that the power division port has power distribution capability, the isolation degree is increased, and then the noise coefficient of the combining port of the received signal is reduced, so that the received signal can be synthesized with low noise, and the response speed and accuracy of the antenna array transceiving signal of the present application are improved. The wideband feeding network 203 is used for distributing the signal output by the T / R component 202 to each antenna unit (transmitting) or collecting the received signal (receiving) through the power divider / combiner, supporting impedance matching within the wideband.

[0030] In an embodiment, the T / R component 202 integrates a transmitting power amplifier (PA), a receiving low-noise amplifier (LNA), a phase shifter and an attenuator, realizing signal amplification and phase / amplitude control. When transmitting, the signal output by the T / R component 202 is distributed to each antenna unit through the power division port (power equalization or weighted distribution); when receiving, the signal received by each antenna unit is collected to the T / R component 202 through the combining port (low-noise amplification), separating the transmitting and receiving paths to avoid interference between the transmitting and receiving signals.

[0031] The beam control unit 201 is electrically connected with the control end of the T / R component 202 through a high-speed serial control bus; wherein the T / R component 202 responds to the control instruction of the beam control unit 201, and the control instruction includes an azimuth instruction and a frequency band instruction.

[0032] In the present application, the high-speed serial control bus adopts an LVDS serial bus, which reduces electromagnetic interference through differential signal transmission, so that the beam control has low delay characteristics.

[0033] In an embodiment, the beam control unit 201 is configured to control the phase shifter to adjust the phase by azimuth instructions, to change the beam pointing generation, and to control the T / R component 202 to switch the gain / attenuation configuration of different frequency bands by frequency band instructions.

[0034] In an embodiment, the wideband feed network 203 is directly coupled with the antenna unit at the end, the direct coupling reduces the insertion loss, and the wideband impedance matching is achieved by the impedance tapering design.

[0035] In an embodiment, the high-speed serial bus is used for high data rate to ensure real-time transmission of control instructions (such as phase value, attenuation amount), and to reduce delay.

[0036] The present application coordinates the phase (azimuth) and gain / attenuation (frequency band) of the T / R component 202 through the beam control unit 201, and solves the problem of coordinated control of multi-frequency band signal distribution and large scanning angle beam pointing under ultra-wide band.

[0037] In an embodiment, the antenna array of the present application is mainly used in a UAV, and when receiving and transmitting signals, the staggered arrangement reduces mutual coupling interference, and the low mutual coupling and high feed efficiency dual optimization structure is achieved by the impedance matching of the direct coupling feed, the staggered arrangement reduces the electromagnetic coupling between units to provide a stable impedance environment for the direct coupling feed; the low-loss characteristic of the direct coupling prevents power loss caused by the increase of the feed path due to the staggered arrangement.

[0038] In an embodiment, the antenna array of the present application is mainly used in a UAV, and when receiving and transmitting signals, the power division / combination port configuration of the T / R component 202 and the high-speed bus of the beam control unit 201 form a fast beamforming to realize data reception. The amplitude / phase weighting of the power division port provides a hardware basis for beam control, and the high-speed bus constantly switches the beam shape through real-time updating of the weighting coefficient, realizes rapid scanning of the azimuth angle, and thus transmits and receives signals.

[0039] Embodiment 2: Referring to Figure 1 and Figure 2 , the wideband feed network 203 includes a multi-section impedance transformation power divider; In the present application, the multi-section impedance transformation power divider is cascaded by 2-4 sections of transmission lines with different characteristic impedances to realize the matching of the input impedance in a wide frequency band and the load impedance of the antenna unit. In actual implementation, a multi-port Wilkinson power divider structure is used, and an isolation resistor is integrated in each transformation section to prevent the existence of serial port interference between ports.

[0040] The multi-section impedance transformation power divider is configured to dynamically respond to at least one frequency band distribution signal output by the T / R component.

[0041] In the present application, the impedance transformation power divider is connected in cascade with multiple impedance gradient transmission lines, the gradient transmission lines include microstrip lines and striplines, and the matching bandwidth is expanded by using the frequency response superposition characteristics of multiple reactive elements. The matching bandwidth of a single-section impedance transformer usually covers only 10% of the center frequency, and the bandwidth of a three-section Chebyshev impedance transformer can be expanded to 50% of the center frequency.

[0042] In the present application, the T / R assembly 202 outputs the radio frequency signal of the corresponding frequency band according to the frequency band instruction of the beam control unit 201, and in the present application, the radio frequency signal contains frequency range and power level information. The multiple-section impedance transformation power divider dynamically switches the impedance transformation sections of different numbers by using the internal control module, so that the input / output impedance of the power divider matches the characteristic impedance of the current frequency band signal, thereby reducing the frequency band insertion loss and switching time.

[0043] In an embodiment, the wideband matching characteristics of the multiple-section impedance transformation power divider provide a stable excitation source for the staggered antenna units, and the double-sided structure of the antenna units adjusts the equivalent dielectric constant. The double-sided structure includes a metal radiation arm and a dielectric substrate, and the load impedance environment of the power divider is reversely optimized, so that the reflection coefficient of the power divider in the full frequency band is less than a preset maximum value.

[0044] In an embodiment, the frequency band instruction is used to make each transformation section of the power divider correspond to a specific frequency band instruction of the T / R assembly 202, and the T / R assembly 202 controls the internal PIN diode switch of the power divider by switching different frequency band instructions, realizes dynamic gating of the multiple transformation sections, and forms a linkage matching of the instruction combination structure.

[0045] In an embodiment, the number of sections of the multiple-section impedance transformation power divider is increased, which causes the linear rise of the insertion loss. In the present application, the equivalent dielectric constant is dynamically adjusted under the double-sided structure by cooperating with the impedance of the antenna unit, so that the number of sections is increased, but the insertion loss is not reduced.

[0046] In an embodiment, the power divider is built-in with a digital adjustable reactive network, and in the case that the beam control unit 201 controls the adjustable reactive network through a high-speed bus, the frequency f and power P parameters are adjusted according to the frequency band allocation signal of the T / R assembly 202, so that the center frequency and bandwidth of the power divider match the allocation signal.

[0047] In an embodiment, at least one channel selection instruction is used, and the power divider selects the transformation section corresponding to the frequency band according to the instruction, so as to realize efficient power distribution in the specified frequency band.

[0048] In an embodiment, the frequency parameter in the frequency band allocation signal is linked with the scan angle parameter in the azimuth instruction - when the beam control unit 201 sends the azimuth angle to reach the frequency range 12-20GHz instruction, the dynamic response system of the power divider automatically calls the pre-stored reactance parameter of this frequency-band-angle combination, avoiding the delay of manual adjustment. In the actual UAV control room, the low-delay transmission of the frequency band allocation signal can also be ensured through the high-speed bus, and the transmission and response time are matched through the dynamic response of the power divider, so that the effect of fast target tracking in the UAV countermeasure scene when the UAV countermeasures the UAV or when the UAV tracks.

[0049] Embodiment 3: Referring to Figure 1 and Figure 2 , the wideband feed network 203 is configured by a frequency range instruction response judgment mechanism; When the wideband feed network 203 receives the first control instruction containing the target frequency range information sent by the beam control unit 201 through the high-speed serial control bus, the first control instruction is parsed, and the frequency range parameter is determined. The frequency range parameter corresponds to the power divider impedance transformation section parameter and the signal distribution ratio; In this application, the first control instruction is parsed by the microprocessor controlling the wideband feed network 203, and the integrity of the instruction is ensured by CRC check. Through the pre-stored frequency range-impedance parameter mapping table, parameter matching is performed, and the intersection of the rated working bandwidth of the antenna unit and the target frequency range can be compared to realize the constraint verification of the beam.

[0050] Verify whether the current double-sided Vivaldi antenna unit 10 meets the working bandwidth constraint condition; it can be understood that in actual implementation, the frequency response table of the double-sided Vivaldi antenna unit 10 stored in the EEPROM built-in the wideband feed network 203 is used to verify whether the target frequency range parameter falls within the valid bandwidth.

[0051] In this application, when judging whether the working bandwidth constraint condition is met, according to the frequency response characteristics of the double-sided Vivaldi antenna unit 10, it is judged whether the target frequency range parameter falls within the valid bandwidth, so as to judge whether the working bandwidth constraint condition is met.

[0052] In the judgment process, the target frequency range information, the beam control unit 201 and the azimuth instruction constitute a joint constraint, and the effective working bandwidth of the antenna unit will be compressed due to the beam tilt. The judgment mechanism needs to dynamically correct the bandwidth constraint condition according to the azimuth angle in real time to ensure that the frequency range switching and the beam pointing are cooperatively adapted.

[0053] In an embodiment, the judgment mechanism, if there is instruction neglect and instruction misidentification, the final result is fed back to the T / R module 202 through the high-speed serial bus, triggering the T / R module 202 to automatically send a frequency band retry instruction, preventing the target tracking from being interrupted due to a single instruction error.

[0054] If the verification is passed, the impedance transformation section of the multi-section impedance transformation power divider is switched to the parameter configuration of any frequency band in the frequency band range parameter, and the adjustment of the signal distribution ratio is completed. In this application, through the mapping of the frequency band range parameter to the power divider impedance transformation section parameter, the fixed frequency band corresponding to each transformation section of the power divider is determined, and the judgment of whether the working bandwidth constraint condition is met is realized. After the verification is passed, the judgment mechanism directly controls the PIN diode switch of the power divider through the SPI interface to realize the accurate switching of the impedance transformation section and avoid the mismatch between the software and the hardware parameters.

[0055] In the judgment process, If the verification is not passed, the wideband feed network 203 ignores the first control instruction.

[0056] In an embodiment, when the unmanned aerial vehicle is receiving and transmitting transmission signals, the beam control unit 201 generates a first control instruction according to the target signal frequency, the first control instruction contains target frequency band information, the wideband feed network 203 parses the instruction through the microcontroller, FPGA and other control modules of the unmanned aerial vehicle, calls the pre-stored frequency band-impedance transformation section mapping table in the frequency band-impedance transformation section mapping table, stores the power divider impedance transformation section parameters and signal distribution ratio corresponding to different frequency bands, and verifies whether the working bandwidth of the current antenna unit covers the target frequency band.

[0057] If it is passed, the control module drives the switch (such as PIN diode, MEMS switch) of the multi-section impedance transformation power divider to switch to the corresponding impedance transformation section to adjust the signal distribution ratio. If the target frequency band exceeds the bandwidth of the antenna unit, the instruction is ignored to avoid mismatch.

[0058] In the verification of the working bandwidth constraint condition, the working bandwidth of the double-sided Vivaldi antenna unit 10 is determined by physical parameters such as the length of the gradually changing slot line and the dielectric constant of the dielectric substrate. The wideband feed network 203 verifies whether the target frequency band is completely contained in the bandwidth through the pre-stored antenna unit bandwidth table.

[0059] The switching of the impedance transformation section and the adjustment of the signal distribution ratio are because each transformation section of the multi-section impedance transformation power divider corresponds to the impedance matching parameters of different frequency bands. After switching to the transformation section corresponding to the target frequency band, the signal distribution ratio is adjusted according to the interference demand of the frequency band.

[0060] Embodiment 4: Referring toFigure 1 and Figure 2 The T / R module 202 comprises a high-frequency coaxial connector; When the high-frequency coaxial connector responds to the first signal of the wide-band feed network 203, the phase shift parameter and the attenuation parameter are determined, and the frequency band allocation signal is generated according to the phase shift parameter and the attenuation parameter; wherein the first signal is a transmission signal; In the present application, the high-frequency coaxial connector is a precision coaxial connector, the inside of which is composed of concentric circles by the inner conductor and the outer conductor, filled with polytetrafluoroethylene medium in the middle, and transmits electromagnetic waves through TEM mode. TEM mode transmission of electromagnetic waves can prevent high-frequency mode dispersion, so that the ultra-wideband signal is transmitted without reflection. The radio frequency output end of the high-frequency coaxial connector is rigidly connected with the power division port of the feed network through the flange, and the inner conductor is directly welded with the microstrip line of the feed network, thereby realizing the low impedance transition effect. The low insertion loss of the high-frequency coaxial connector can compensate for the power loss caused by the power division / combination of the feed network, so that when responding to the first signal, the frequency band allocation instruction transmitted by the beam control unit 201 is ensured to be transmitted to the T / R module 202 without interference.

[0061] In this process, the frequency band allocation signal is generated according to the phase shift parameter and the attenuation parameter. The first signal is a transmission signal, based on the principle of electromagnetic wave phase superposition, the high-frequency coaxial connector realizes the linear coupling of signal voltage and current through the impedance characteristics of the inner conductor and the outer conductor when transmitting the transmission signal, and encodes multiple parameters into the frequency band allocation signal through the built-in FPGA according to the coupling coefficient and the inversion calculation of the phase shift parameter and the attenuation parameter. The frequency band allocation signal includes frequency band identification and power level.

[0062] When the high-frequency coaxial connector responds to the second signal of the wide-band feed network 203, the phase difference of different signals is determined, and the target signal is synthesized according to the phase difference; wherein the second signal is a reception signal.

[0063] In the present application, the second signal is a reception signal, based on the principle of phased array beam synthesis, the high-frequency coaxial connector receives the echo signal (second signal) of the multi-channel antenna unit, eliminates the inter-channel crosstalk through the outer conductor shielding layer, determines the phase difference of different channel signals through the time delay characteristics of the inner conductor, and then synthesizes the multi-channel signal into a focused beam (target signal) pointing to the target through the weighting synthesis algorithm.

[0064] In the present application, the frequency band allocation signal corresponding to the transmission signal contains the center frequency of the target frequency band, and the reception mode dynamically adjusts the reference frequency of the phase difference calculation according to the center frequency, preventing phase ambiguity during cross-band synthesis; at the same time, the attenuation parameter of the transmission mode is used for automatic gain control of the reception mode, when the transmission attenuation reaches the preset attenuation threshold, the reception gain is automatically improved above the preset attenuation threshold, so that the transmission and reception signal power is dynamically balanced.

[0065] In the present application, when the received signal is synthesized into a target signal according to the phase difference, the high isolation of the shielding layer of the high-frequency coaxial connector prevents the adjacent channel signal crosstalk from causing errors in the phase difference calculation; the frequency band distribution signal generated by the transmission signal is transmitted through the control line in the shielding layer, and can also prevent signal distortion caused by electromagnetic interference.

[0066] In an embodiment, by the frequency band distribution signal and the phase difference calculation, parameter sharing and physical isolation of the shielding layer are realized, so that the transmit-receive mode is seamlessly switched, and the transmit-receive delay of the independently designed T / R component 202 is prevented.

[0067] In an embodiment, the high-frequency coaxial connector has two types of SMA and N, which realizes low-loss and high-isolation signal transmission through the coaxial structure of the inner conductor (signal) and the outer conductor (shielding). Its impedance matching with the wideband feed network 203 and the antenna unit avoids signal reflection. When the wideband feed network 203 outputs the transmission signal (first signal), the high-frequency coaxial connector transmits the signal to the phase shifter and attenuator module of the T / R component 202. The phase shift parameter is calculated according to the azimuth instruction of the beam control unit 201, and the phase shift of each antenna unit is obtained by adjusting the signal phase through the phase shifter. The attenuation parameter is calculated according to the sidelobe suppression requirement, and the amplitude weighting value of each unit is obtained by adjusting the signal amplitude through the attenuator. When the wideband feed network 203 outputs the received signal (second signal, i.e. the unmanned aerial vehicle reflection / radiation signal received by each antenna unit), the high-frequency coaxial connector transmits the multi-channel received signal to the phase detection module of the T / R component 202, realizes the improvement of the signal-to-noise ratio of the received signal, and enhances the detection capability of the weak signal, and at the same time, the target azimuth is located through the phase difference.

[0068] In the present application, the transmission signal is analyzed through the radio frequency interface of the connector, so that the input signal power is stable, and a reliable input is provided for parameter determination; the process of synthesizing the target signal is output to the feed network through the connector, and the low reflection characteristic of the interface can prevent beam distortion caused by secondary reflection of the synthesized signal. In the process of generating the frequency band distribution signal, the power output of the transmission signal is directly bound, so that protocol conversion is not required, and the delay is reduced. The phase difference calculation accuracy determines the pointing accuracy of the target signal of the functional output.

[0069] Embodiment 5: Referring to Figure 3 , the T / R component 202 is configured with a phase calibration judgment mechanism; When the azimuth instruction of the receiving beam control unit 201 is received, the control module parses the target azimuth angle, retrieves the array geometric parameter to calculate the phase of each channel, and queries the adjustable range of the phase shifter; In the present application, the beam control unit 201 generates the azimuth instruction according to the azimuth of the target UAV. After the control module of the T / R component 202 analyzes θ, the array geometry parameters are retrieved, the phase amount required by each channel is determined through phase calculation, and then the adjustable range of the phase shifter is inquired.

[0070] In an embodiment, the phase amount of each channel is calculated according to the horizontal azimuth angle and the elevation azimuth angle of the target signal, combined with the geometry parameters of the double-sided Vivaldi antenna array, to determine the phase compensation amount of the channel to prevent signal interference caused by electromagnetic wave superposition in the target azimuth.

[0071] In an embodiment, the inquiry of the adjustable range of the phase shifter is because the temperature drift occurs due to the different altitudes in the case of rising and lowering, and the effective adjustable range is inaccurate due to the aging of the equipment. The present application compares the calculated phase amount with the effective range through the judgment mechanism to prevent the adjustable range from being too large, resulting in phase locking failure.

[0072] In the present application, dynamic phase calibration is achieved through the dual mechanisms of hardware feedback and dynamic parameter correction.

[0073] If the phase amount exceeds the range, the extreme value is set and a warning is generated, otherwise the phase value is directly set.

[0074] In the present application, if the calculated phase amount is within the range, the phase value of the phase shifter is directly set; if it exceeds the range, the maximum / minimum value of the phase shifter is set, and a warning is generated. The beam pointing direction of the array is directly related to the phase difference of each unit, and the control module calculates the phase amount required by each channel through the phase difference and the pre-stored array geometry parameter table combined with the current signal wavelength λ, to ensure that the phase adjustment matches the physical structure of the array. The phase adjustment range of the phase shifter is limited by its physical design. If the calculated phase amount exceeds the range, the control module sets the phase value to the maximum value of the phase shifter and sends a warning to the main control system through the bus to prevent performance degradation caused by out-of-range adjustment of the phase shifter.

[0075] In an embodiment, the phase calibration judgment mechanism cooperates with the temperature sensor of the phase shifter of the T / R component 202 to dynamically correct the effective adjustable range by reading the temperature drift coefficient of the phase shifter in real time.

[0076] In an embodiment, the phase calibration judgment mechanism realizes dynamic phase locking and overload protection of the phase shifter of the T / R component 202 by analyzing the target azimuth angle, retrieving the array geometry parameters to calculate the phase amount, and inquiring the adjustable range of the phase shifter.

[0077] Embodiment 6: Reference Figure 3The beam control unit 201 comprises a first unit and a second unit; the first unit is configured to generate a phase shift amount instruction of the T / R component 202 according to the working frequency; the second unit is configured to receive the phase shift amount of the T / R component 202, determine a target weighting parameter of the wideband feed network 203 at the target angle, and generate a linear phase gradient instruction fed back to the T / R component 202 according to the target weighting parameter.

[0078] In the present application, the first unit calculates the required phase shift amount instruction through the pre-stored frequency-wavelength mapping table and in combination with the target beam pointing angle θ (input by an external sensor), so as to avoid the beam pointing deviation caused by the frequency change.

[0079] In the present application, the second unit retrieves the angle-weighting parameter mapping table according to the actual phase shift amount fed back by the T / R component 202, and determines the target weighting parameter of the wideband feed network 203. Subsequently, the instruction is generated according to the linear phase gradient formula, so as to adjust the phase gradient step of the T / R component 202, and make the phases of the units change according to the linear law, thereby forming the beam pointing to θ.

[0080] In an embodiment, the first unit and the second unit are two independent logical processing modules integrated in different logical partitions of the same FPGA chip and interconnected through an internal high-speed bus.

[0081] In an embodiment, the initial phase shift amount generated by the first unit is transmitted to the second unit in real time through an AXI4 bus, the second unit compares the initial phase shift amount with the actual phase shift amount fed back by the T / R component 202, calculates the deviation value, fits the deviation curve through the least square method, generates a correction coefficient and feeds it back to the first unit. The first unit dynamically adjusts the subsequent phase shift amount calculation according to the correction coefficient, thereby preventing the tracking deviation caused by the closed-loop lag.

[0082] In an embodiment, the phase shift amount instruction of the first unit is sent to the T / R component 202 through a high-speed serial control bus, and the linear phase gradient instruction of the second unit is sent to the same bus synchronously. The phase shifter of the T / R component 202 sets the coarse adjustment value according to the initial phase shift amount instruction, and the linear phase gradient instruction realizes the fine adjustment, and the seamless connection is realized through the priority logic inside the T / R component 202, thereby preventing the phase jump caused by the instruction conflict.

[0083] In an embodiment, the phase shift amount instruction of the first unit determines the second unit, and the linear phase gradient instruction of the second unit corrects the deviation of the first unit. When the target moves rapidly, the first unit generates the coarse adjustment instruction according to the real-time frequency and angle, and the second unit generates the fine adjustment instruction synchronously according to the feedback deviation at the previous moment, the composite control of the two kinds of instructions reduces the beam tracking lag time from 80 ns of the single first unit to 30 ns, thereby enabling the high-speed tracking of the target.

[0084] Embodiment 7: Referring to Figure 3 , the target weighting parameter is determined by a Taylor amplitude weighting mechanism deployed in the beam control unit 201; wherein the Taylor amplitude weighting mechanism generates an amplitude weighting model at the target angle based on the difference between the real-time sidelobe level of the double-sided Vivaldi antenna unit 10 and the preset sidelobe level and the minimum value of the equal sidelobe number of the real-time double-sided Vivaldi antenna unit 10, and the amplitude weighting model includes the first amplitude weighting of the unequal power divider under the received signal and the second amplitude weighting of the variable gain amplifier under the transmitted signal.

[0085] In this application, Taylor amplitude weighting is a classic method of suppressing sidelobes in antenna array design, the core of which is to control the sidelobe level within a preset range through non-uniform amplitude weighting (such as low amplitude of edge elements and high amplitude of center elements).

[0086] The specific formula of Taylor amplitude weighting is: ; Wherein, is the number of array elements, is the number of expansion terms (N =N-1), N represents the equal sidelobe number of the antenna, and the sidelobe level is suppressed by adjusting the coefficient while ensuring that the main lobe gain loss is less than a preset value; the weighting coefficient matrix, is a positive integer, indicating the number of weightings; In this application, the power divider of the wideband feed network 203 in the receiving link adopts an unequal power division design and is matched with the adjusted Taylor weighting coefficient. After the signals received by each antenna unit are distributed by the power divider, the amplitude is adjusted according to the weighting model, thereby suppressing the sidelobe.

[0087] In this application, the variable gain amplifier of the T / R component 202 in the transmitting link adjusts the gain of each channel according to the weighting model, so that the amplitude of the transmitted signal is consistent with the Taylor weighting coefficient. After radiation, the sidelobe level of the antenna array is suppressed and the main lobe gain is improved.

[0088] In one embodiment, the first amplitude weighting is the unequal power divider of the wideband feed network 203 at the receiving end, which realizes the amplitude weighting of the received signal by adjusting the attenuation coefficient of each power port to suppress the noise and interference at the receiving end.

[0089] In one embodiment, the second amplitude weighting is the variable gain amplifier of the T / R component 202 at the transmitting end, which dynamically adjusts the transmission power distribution according to the Taylor coefficient to concentrate the power in the main lobe direction.

[0090] In an embodiment, the Taylor amplitude weighting mechanism is deployed in the second unit of the beam control unit 201, and the calculated weighting parameter realizes joint optimization of amplitude and phase with the phase shift amount instruction of the first unit: the first unit calculates the main lobe pointing of the phase amount according to the target angle, and the second unit calculates the amplitude coefficient through the Taylor weighting mechanism to realize sidelobe suppression, and synchronously transmits to the T / R module 202 through the AXI4 bus to avoid beam distortion caused by amplitude and phase mismatch.

[0091] In an embodiment, the phase calibration judgment mechanism corrects the phase error to provide a stable phase basis for the Taylor weighting, and avoids sidelobe lifting caused by the phase error; at the same time, the amplitude coefficient of the Taylor weighting mechanism is fed back to the phase calibration judgment mechanism for dynamically adjusting the minimum value of the equal sidelobe number calculation of the phase amount.

[0092] Embodiment 8: Referring to Figure 3 , the Taylor amplitude weighting mechanism is also used for: When receiving the sidelobe suppression instruction of the beam control unit 201, the weighting type is analyzed, the weighting-amplitude coefficient table is called to calculate the amplitude value and the attenuation amount of each channel, and the adjustable range of the attenuator is inquired; If the attenuation amount exceeds the range, the extreme value is set and a warning is generated, otherwise the attenuation value is directly set.

[0093] In this application, the beam control unit 201 generates a sidelobe suppression instruction according to the anti-jamming requirements of the unmanned aerial vehicle, which contains a weighting type field. After analyzing the field, the Taylor amplitude weighting mechanism calls the corresponding weighting-amplitude coefficient table from the storage module as the basis for subsequent calculation. Based on the analyzed weighting type, the mechanism obtains the target amplitude value of each channel from the coefficient table. At the same time, according to the reference amplitude of the current transmit / receive link, the attenuation amount required by each channel is calculated.

[0094] In this application, the adjustable range of the attenuator is determined by its hardware characteristics. After the mechanism inquires the range, it compares the calculated attenuation amount. If it exceeds the range, the attenuator is set to the extreme value, and a warning is sent to the main control system through the bus; if it does not exceed, the attenuation value is directly set.

[0095] In an embodiment, the sidelobe suppression instruction of the receiving beam control unit 201 is based on the instruction transmission protocol of the high-speed serial bus, and Manchester coding is used to ensure the integrity of the instruction. The analysis logic is realized through a state machine to realize the identification of multiple weighting types; In an embodiment, the weighting-amplitude coefficient table is pre-stored in the EEPROM of the beam control unit 201 in the process of calling the weighting-amplitude coefficient table and calculating the attenuation amount, and contains the amplitude coefficient mapping relationship and attenuation amount calculation of different weighting types and frequency bands.

[0096] In an embodiment, in response to the sidelobe suppression instruction of the beam control unit 201, the Chebyshev weighting with higher sidelobe suppression is switched to, and the attenuator is dynamically adjusted by the attenuation amount calculation to prevent repeated storage of sidelobe suppression and shorten the coefficient retrieval delay.

[0097] In an embodiment, the phase calibration judgment mechanism corrects the phase error to provide accurate amplitude coefficient basis for the attenuation amount calculation. The phase error will cause the amplitude coefficient deviation, and the accuracy of the amplitude coefficient is improved after the phase calibration, so that the attenuation amount calculation error is reduced. At the same time, the attenuator setting result is fed back to the phase calibration judgment mechanism, which is used to dynamically adjust the amplitude weight of the phase amount calculation.

[0098] In an embodiment, the attenuator is integrated in the radio frequency link of the T / R component 202, and the attenuation amount directly controls the attenuator through the SPI interface. The low insertion loss of the high-frequency coaxial connector ensures that the signal after attenuation can still be efficiently transmitted to the antenna unit. The shielding layer of the connector is designed to be coplanar with the attenuator ground layer, which suppresses the electromagnetic interference when the attenuator switches, and also enables the sidelobe suppression and attenuator adjustment to be optimized at the same time.

[0099] Embodiment 9: Referring to Figure 3 , the beam control unit 201 is configured with a control instruction generation judgment mechanism; After receiving the target data of the target device, the target azimuth and frequency are analyzed, and the scanning range and bandwidth constraint verification are retrieved; If the azimuth is out of range, it is corrected to the boundary value, and if the frequency is out of range, it is ignored and an error log is generated; Otherwise, the corresponding azimuth and frequency band instructions are generated and sent to the T / R component 202.

[0100] In this application, the target device (unmanned aerial vehicle detection radar) sends the target data to the beam control unit 201, and the mechanism analyzes and extracts the azimuth and frequency. Then, the pre-stored scanning range and bandwidth constraint are retrieved for verification. The scanning range of the linear array is limited by the array design. If the target azimuth is out of range, the beam pointing will appear grating.

[0101] In this application, the mechanism corrects the azimuth to the boundary value after analysis, so that the beam pointing still falls within the effective scanning range (main lobe energy concentration, sidelobe level controllable). The working bandwidth of the antenna array is determined by the structure of the Vivaldi antenna, i.e. the length of the tapered slot line. If the target frequency is out of the pre-set bandwidth, the radiation efficiency of the antenna will be greatly reduced, effectively interfering with the unmanned aerial vehicle. The mechanism ignores the frequency instruction and generates an error log to prompt the operator that the target may be located in the non-working frequency band.

[0102] In an embodiment, when the azimuth angle is out of range, the linear interpolation algorithm is used to correct the nearest boundary value, the correction error is corrected by fitting the boundary transition curve using the least square method; when the frequency is out of range, an error log is triggered, the error log includes a timestamp, a target ID, and an out-of-range frequency value, the log is uploaded to the system monitoring terminal through the RS-485 bus, and at the same time, the target instruction sending is suspended to reduce invalid power consumption.

[0103] In an embodiment, the azimuth instruction and the frequency band allocation instruction are encoded in 16 bits and sent to the T / R component 202 through a high-speed serial control bus to realize queuing of multiple target instructions.

[0104] In an embodiment, the azimuth instruction generated by the control instruction generation and judgment mechanism needs to be verified by the Taylor amplitude weighting mechanism, and a larger sidelobe suppression margin is reserved when the instruction is generated; if the verification fails, the judgment mechanism automatically adjusts the azimuth angle correction value so that the sidelobe level after Taylor weighting is less than a preset value, thereby avoiding the sidelobe lifting during boundary scanning.

[0105] In an embodiment, the range of the phase shifter of the phase calibration judgment mechanism provides a hardware constraint for the control instruction generation and judgment mechanism, the resolved azimuth angle needs to be converted into a phase quantity and verified whether it is within the range of the phase shifter, if it is out of range, the judgment mechanism corrects the azimuth angle in advance to prevent the phase calibration judgment mechanism from triggering the extreme value setting later.

[0106] In an embodiment, the control instruction generation and judgment mechanism is deployed in the second unit of the beam control unit 201, the resolved azimuth angle and frequency are transmitted to the first unit through the AXI4 bus, and the first unit generates an initial phase shift quantity instruction based on this; the second unit simultaneously receives the hardware state feedback of the first unit, dynamically adjusts the constraint verification threshold, and improves the instruction accuracy.

[0107] Embodiment 10: The different components of the T / R component 202 are clocked synchronously, and the beam control unit 201 periodically reads the channel phase and amplitude state of each T / R component 202, calculates the average deviation, and verifies whether it is out of a preset threshold; If the threshold is exceeded, a correction instruction is generated to send the corresponding T / R component 202, otherwise the state is maintained.

[0108] In this application, the clock of the T / R component 202 is the core of the control signal transmission timing (the phase adjustment of the transmitted signal needs to be based on a unified clock reference). If the clocks are not synchronized, the delay difference corresponding to the same phase instruction in different components will be amplified, resulting in a deviation between the actual phase difference and the instruction value. By synchronizing the clock (unifying the clock period of all components to 10 ns), the timing reference difference is eliminated, ensuring the consistency of the phase instruction.

[0109] In the present application, the beam control unit 201 reads the real-time phase and amplitude of each T / R component 202 through the bus periodically. The average phase and amplitude are calculated, and the deviation of each channel from the average value is calculated. The preset threshold is determined by the performance requirements of the antenna array. If the phase deviation of a certain channel (exceeds the threshold), the beam control unit 201 generates a correction instruction and sends it to the T / R component 202 to adjust the phase shifter value; if the deviation (does not exceed the threshold), it is not adjusted, and the current state is maintained.

[0110] In one embodiment, the clock synchronization structure is to ensure the consistency of the time reference of the signal: the channel phase / amplitude data of each T / R component 202 is sampled based on the same master clock, preventing error in deviation calculation caused by different channel data collected at different times when reading asynchronously; periodic reading takes advantage of the low jitter characteristics of clock synchronization to ensure that the phase / amplitude data read each time has time coherence, reducing errors.

[0111] 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. An ultra-wideband, large-scan-angle Vivaldi antenna array for countering unmanned aerial vehicles, comprising bifacial Vivaldi antenna elements arranged in an interleaved array structure, characterized in that: The dual-sided Vivaldi antenna unit is electrically connected to the wideband circuit control module; wherein, the wideband circuit control module includes a wideband feed network, a T / R assembly, and a beam control unit; The end of the broadband feed network is directly coupled to the dual-sided Vivaldi antenna element; wherein the dual-sided Vivaldi antenna element responds to the broadband signal allocation command of the broadband feed network; The RF output terminal of the T / R component is connected to the power divider port of the broadband feed network, and the RF input terminal of the T / R component is connected to the combiner port of the broadband feed network. The beam control unit is electrically connected to the control terminal of the T / R component via a high-speed serial control bus; wherein, the T / R component responds to the control commands of the beam control unit, and the control commands include azimuth commands and frequency band commands.

2. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 1, characterized in that, The broadband power supply network includes multiple impedance converter power dividers. Among them, the multi-section impedance transformation power divider is used to dynamically respond to at least one bandwidth allocation signal output by the T / R component.

3. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 2, characterized in that, The broadband power supply network is equipped with a frequency band command response judgment mechanism; When the broadband feed network receives the first control command containing the target frequency band information sent by the beam control unit through the high-speed serial control bus, it parses the first control command and determines the frequency band range parameters. The frequency band range parameters correspond to the impedance transformation section parameters of the power divider and the signal allocation ratio. Verify whether the current dual-sided Vivaldi antenna element meets the operating bandwidth constraints. If the verification is successful, the impedance transformation section of the multi-section impedance transformation power divider will be switched to the parameter configuration of any frequency band within the frequency band range parameters to complete the adjustment of the signal distribution ratio. If the verification fails, the broadband feeder network ignores the first control command.

4. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 1, characterized in that, The T / R assembly includes a high-frequency coaxial connector; Specifically, when the high-frequency coaxial connector responds to the first signal of the broadband feed network, it determines the phase shift parameter and attenuation parameter, and generates a bandwidth allocation signal based on the phase shift parameter and attenuation parameter; wherein, the first signal is the transmit signal; When the high-frequency coaxial connector responds to the second signal of the broadband power supply network, it determines the phase difference between the different signals and synthesizes the target signal based on the phase difference; wherein, the second signal is the received signal.

5. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 4, characterized in that, The T / R component is equipped with a phase calibration judgment mechanism; When receiving the azimuth command from the beam control unit, the control module analyzes the target azimuth angle, retrieves the array geometric parameters to calculate the phase of each channel, and queries the adjustable range of the phase shifter. If the phase value exceeds the range, set an extreme value and generate an early warning; otherwise, set the phase value directly.

6. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 1, characterized in that, The beam control unit includes a first unit and a second unit; wherein, the first unit is used to generate a phase shift command for the T / R component response according to the operating frequency; the second unit is used to receive the phase shift of the T / R component, determine the target weighting parameters of the broadband feed network at the target angle, and generate a linear phase gradient command fed back to the T / R component according to the target weighting parameters.

7. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 6, characterized in that, The target weighting parameters are calculated and determined by the Taylor amplitude weighting mechanism deployed in the beam control unit. The Taylor amplitude weighting mechanism generates an amplitude weighting model at the target angle based on the difference between the real-time sidelobe level and the preset sidelobe level of the dual-sided Vivaldi antenna element and the minimum value of the equal sidelobe number of the real-time dual-sided Vivaldi antenna element. The amplitude weighting model includes the first amplitude weighting of the unequal power divider under the received signal and the second amplitude weighting of the variable gain amplifier under the transmitted signal.

8. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 7, characterized in that, The Taylor magnitude weighting mechanism is also used for: When receiving the sidelobe suppression command from the beam control unit, the weighting type is parsed, the weighting-amplitude coefficient table is retrieved to calculate the amplitude value and attenuation of each channel, and the adjustable range of the attenuator is queried. If the attenuation exceeds the range, set an extreme value and generate an early warning; otherwise, set the attenuation value directly.

9. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 7, characterized in that, The beam control unit is equipped with a control command generation and judgment mechanism; Among them, after receiving the target data from the target device, the target azimuth and frequency are analyzed, and the scanning range and bandwidth constraints are retrieved for verification. If the azimuth angle is out of range, it will be corrected to the boundary value; if the frequency is out of range, it will be ignored and an error log will be generated. Otherwise, generate the corresponding azimuth and frequency band command and send it to the T / R component.

10. The ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures as described in claim 1, characterized in that, The clocks of the different components of the T / R module are synchronized, and the beam control unit periodically reads the channel phase and amplitude status of each T / R module, calculates the average deviation, and verifies whether it exceeds the preset threshold. If the threshold is exceeded, a correction command is generated and sent to the corresponding T / R component; otherwise, the state is maintained.

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