Cross-eye jamming method, equipment, device and medium based on digitally coded metasurface

Abstract

The present application relates to a cross-eye jamming method, equipment, device, and medium based on a digitally coded metasurface. Two digitally coded surfaces are used as antenna structures in the cross-eye jamming equipment and are symmetrically arranged on both sides of the protected target in the direction of the line of sight of a single-pulse radar. Any one of the digitally coded metasurfaces is selected, and the compensation phase of each unit is calculated and encoded based on the beam information of the interference wave signal to be modulated, the feed horn, and the coordinates of each unit on the digitally coded metasurface. The coding on the other metasurface is determined based on the coding on the metasurface. The amplitude ratio of the signals transmitted by the two feed horns is determined based on the angle between the digitally coded metasurface and the line of sight of the interfered radar. A modulated interference signal is generated based on the signal amplitude, the amplitude ratio, and the encoded two digitally coded metasurfaces. This method can effectively reduce costs and flexibly control the direction of the modulated signal beam.

Description

Technical Field

[0001] The present application relates to the field of radar electronic countermeasure technology, and in particular to a cross-eye interference method, equipment, device and medium based on digitally coded metasurface. Background Art

[0002] Monopulse radar technology is mainly used to measure the angular position information of the target. It can determine the target's angle information in one echo pulse. It has the advantages of high angle measurement accuracy, fast speed, and strong anti-interference ability. It is widely used in target tracking and other fields. How to achieve more effective interference with monopulse radar has always been a hot issue in the field of radar countermeasures.

[0003] Cross-eye jamming is a coherent jamming method that effectively interferes with monopulse radar. Deployed on a protected platform, it can cause the monopulse radar to point outside the protected platform's solid angle, disrupting angle measurements. The core of the cross-eye jamming method lies in achieving coherence between the two jammers within the platform by precisely and stably controlling their amplitude and phase. This typically requires a 180° phase difference and an amplitude ratio close to 1 between the two jammers.

[0004] However, existing cross-eye jammer antennas mostly use mechanical rotation, resulting in slow beam-pointing adjustment. Digitally coded metasurfaces, on the other hand, can manipulate signal phase and direction by controlling the encoding of coding units. Compared to traditional antennas, these systems offer faster signal direction control and greater flexibility. Furthermore, digitally coded metasurfaces can continue to operate even if a few coding units are damaged, improving system reliability. Summary of the Invention

[0005] Based on this, it is necessary to provide a cross-eye interference method, equipment, device and medium based on digitally coded metasurface that can achieve arbitrary angle interference of single-pulse radar to address the above technical problems.

[0006] A cross-eye jamming method based on a digitally coded metasurface is implemented in a cross-eye jamming device. The cross-eye jamming device includes two digitally coded metasurfaces as antenna structures. When a protected target is located on the line of sight of a monopulse radar, the two digitally coded metasurfaces are symmetrically arranged on either side of the protected target in the direction of the line of sight. The method includes:

[0007] Obtaining the elevation angle, azimuth angle, and signal amplitude of the interference wave signal beam to be modulated;

[0008] Select any digitally coded metasurface as the first digitally coded metasurface, and calculate the compensation phase of each unit according to the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface;

[0009] Determine a single-bit code on each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determine a single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface;

[0010] Determining the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns according to the angle between the line of sight of the digitally coded metasurface and the interfered radar;

[0011] The two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the monopulse radar.

[0012] In one embodiment, the calculation based on the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface to obtain the compensation phase of each unit includes:

[0013] Calculate the distance between the feed horn and each unit on the digitally coded metasurface based on the coordinates of the feed horn and the coordinates of each unit, and obtain the incident phase of each unit based on the distance;

[0014] Calculating the output phase of each unit according to the elevation angle and azimuth angle of the interference wave signal beam to be modulated and the coordinates of each unit;

[0015] According to the incident phase and the outgoing phase on each unit, the compensation phase of each unit is obtained.

[0016] In one embodiment, determining the single-bit code of each unit on the first digitally coded metasurface according to the compensation phase of each unit includes:

[0017] Determine the actual phase compensation value corresponding to each unit according to the compensation phase, wherein the actual phase compensation is 0° or 180°;

[0018] The cells on the first digital coding surface with an actual phase compensation of 0° are encoded as “0”, and the cells on the first digital coding surface with an actual phase compensation of 180° are encoded as “1”.

[0019] In one embodiment, the actual phase compensation value corresponding to each unit is determined according to the compensation phase using the following formula:

[0020]

[0021] In the above formula, represents the actual phase compensation value of the i-th unit on the first digitally coded metasurface, represents the compensation phase of the i-th unit.

[0022] In one embodiment, determining a single-bit code on another digitally coded metasurface based on the single-bit code on the first digitally coded metasurface includes:

[0023] The code of each unit on another digitally coded metasurface is set to the opposite value of the code of the unit at the same position on the first digitally coded metasurface.

[0024] In one embodiment, the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns is determined based on the angle between the line of sight of the digitally coded metasurface and the interfered radar, using the following two formulas:

[0025]

[0026]

[0027] In the above formula, θ r represents the angle between the digitally coded metasurface and the line of sight of the interfered radar, d represents the distance between the monopulse antennas, and λ represents the radar operating wavelength. Either a1 or a2 is arbitrarily selected as the amplitude ratio.

[0028] The present application also provides a cross-eye jamming device based on a digitally coded metasurface, the device comprising two digitally coded metasurfaces as antenna structures. When a protected target is located on the line of sight of a monopulse radar, the two digitally coded metasurfaces are symmetrically arranged on both sides of the protected target in the direction of the line of sight.

[0029] The above-mentioned cross-eye interference method based on digitally coded metasurface is implemented in the equipment.

[0030] A computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0031] Obtaining the elevation angle, azimuth angle, and signal amplitude of the interference wave signal beam to be modulated;

[0032] Select any digitally coded metasurface as the first digitally coded metasurface, and calculate the compensation phase of each unit according to the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface;

[0033] Determine a single-bit code on each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determine a single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface;

[0034] Determining the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns according to the angle between the line of sight of the digitally coded metasurface and the interfered radar;

[0035] The two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the monopulse radar.

[0036] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the following steps:

[0037] Obtaining the elevation angle, azimuth angle, and signal amplitude of the interference wave signal beam to be modulated;

[0038] Select any digitally coded metasurface as the first digitally coded metasurface, and calculate the compensation phase of each unit according to the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface;

[0039] Determine a single-bit code on each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determine a single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface;

[0040] Determining the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns according to the angle between the line of sight of the digitally coded metasurface and the interfered radar;

[0041] The two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the monopulse radar.

[0042] The cross-eye jamming method, equipment, device, and medium based on digitally coded metasurfaces are described above. Two digitally coded metasurfaces are used as antenna structures in the cross-eye jamming equipment and are symmetrically arranged on either side of the protected target in the direction of the monopulse radar's line of sight. Any one of the digitally coded metasurfaces is selected as the first digitally coded metasurface. The compensation phase of each unit is calculated based on the pitch and azimuth angles of the interfering wave beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface. The single-bit code of each unit on the first digitally coded metasurface is determined based on the compensation phase of each unit. The single-bit code on the other digitally coded metasurface is determined based on the single-bit code on the first digitally coded metasurface. The amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns is determined based on the angle between the digitally coded metasurface and the line of sight of the interfered radar. The two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitudes and amplitude ratios. The two digitally coded metasurfaces generate modulated jamming signals to achieve jamming of the monopulse radar. This method can effectively reduce costs and flexibly control the pointing direction of the modulated signal beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 1 is a flow chart of a cross-eye interference method based on a digitally coded metasurface in one embodiment;

[0044] Figure 2 A schematic diagram of cross-eye interference using a digitally coded metasurface as an antenna structure in one embodiment;

[0045] Figure 3 A schematic diagram of digitally coded metasurface beam steering in one embodiment;

[0046] Figure 4 This is a schematic diagram of the angle measurement results under different amplitude ratios in an experiment;

[0047] Figure 5 A schematic diagram of the angle measurement results under a fixed amplitude ratio in an experiment;

[0048] Figure 6 This is a contour map of different interference angle multiples achieved in an experiment;

[0049] Figure 7 1 is a block diagram of a cross-eye jammer based on a digitally coded metasurface in one embodiment;

[0050] Figure 8 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0052] The existing technical solutions for achieving cross-eye interference have the problems of high cost and inflexible control of the modulation signal beam pointing. Figure 1 As shown, a cross-eye jamming method based on a digitally coded metasurface is provided. The method is implemented in a cross-eye jamming device, which includes two digitally coded metasurfaces as antenna structures. The protected target is located on the line of sight of a monopulse radar, and the two digitally coded metasurfaces are symmetrically arranged on both sides of the protected target in the direction of the line of sight. The method specifically includes the following steps:

[0053] Step S100: Acquire the elevation angle, azimuth angle, and signal amplitude of the interference wave signal beam to be modulated.

[0054] In step S110, any one digitally coded metasurface is selected as the first digitally coded metasurface, and the compensation phase of each unit on the digitally coded metasurface is calculated based on the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface.

[0055] Step S120 , determining the single-bit code of each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determining the single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface.

[0056] Step S130: Determine the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns according to the angle between the digitally coded metasurface and the line of sight of the interfered radar.

[0057] In step S140, the two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurface according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the monopulse radar.

[0058] In this method, a digitally coded metasurface is used as the antenna structure for cross-eye jamming equipment. A digitally coded metasurface is an advanced electromagnetic material that performs single-bit quantization encoding of "0" and "1" on each unit, equivalent to phase-modulating the signal by "0°" and "180°." Compared to traditional horn antennas, digitally coded metasurfaces offer advantages such as low cost and flexible beam pointing. Using a digitally coded metasurface as the antenna structure for cross-eye jamming can achieve the desired jamming effect against single-pulse radars while maintaining the advantages of low cost and flexible control.

[0059] Specifically, in a cross-eye jammer using a digitally coded metasurface as an antenna structure, such as Figure 2 As shown, the protected target is on the line of sight of the single-pulse radar, and the two digitally coded metasurfaces are symmetrically arranged on both sides of the line of sight with the protected target as the center. Furthermore, the protected target and the two digitally coded metasurfaces are arranged on the same straight line.

[0060] Furthermore, based on the use of digitally coded metasurface as the antenna structure, a cross-eye interference method was proposed. The digitally coded metasurface unit can precisely design the "0" and "1" single-bit quantization codes to control the signal's "0°" and "180°" phases, thereby achieving directional control of the transmitted beam. By combining the two digitally coded metasurfaces with the corresponding units to set opposite codes, a 180° phase difference in the signals transmitted by the two digitally coded metasurfaces is achieved. The amplitude control of the digitally coded metasurface is used to achieve angular deception interference on the single-pulse radar.

[0061] In step S100, information related to a preset modulated interference signal is first obtained, including the interference signal beam direction and signal amplitude.

[0062] In step S110, calculating the compensation phase of each unit based on the elevation and azimuth angles of the interfering signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface includes: calculating the distance between the feed horn and each unit based on the coordinates of the feed horn and each unit on the digitally coded metasurface, and obtaining the incident phase of each unit based on the distance. Calculating the exit phase of each unit based on the elevation and azimuth angles of the interfering signal beam to be modulated, and the coordinates of each unit. Finally, obtaining the compensation phase of each unit based on the incident phase and the exit phase on each unit.

[0063] like Figure 3 As shown, electromagnetic waves are emitted by the feed horn, and each unit is designed with 0 / 1 encoding to achieve directional control of the emission beam.

[0064] Specifically, when calculating the incident phase of the electromagnetic wave of each unit, the feed horn coordinates are (x s ,y s ,z s ), for the i-th unit (x i ,y i ,z i ), the incident phase It can be expressed as:

[0065]

[0066] In formula (1), k0 is the free space wave number, r i is the distance from the i-th unit to the feed horn.

[0067] Specifically, when calculating the electromagnetic wave outgoing phase of each unit, it is assumed that the pointing direction of the reflected beam of the digital coding metasurface is (α, β), α is the pitch angle of the beam, and β is the azimuth angle of the beam. The outgoing phase of the i-th unit is calculated using the given pitch angle α and azimuth angle β.

[0068]

[0069] Furthermore, the compensation phase corresponding to each unit is calculated using the following formula:

[0070]

[0071] In step S120, since a single-bit digitally coded metasurface can only compensate for two discrete phase values, namely 0° and 180°, determining the single-bit code of each unit on the first digitally coded metasurface based on the compensated phase of each unit includes: determining the actual phase compensation value corresponding to each unit based on the compensated phase, where the actual phase compensation is 0° or 180°. The unit on the first digitally coded metasurface with an actual phase compensation of 0° is encoded as "0", and the unit on the first digitally coded metasurface with an actual phase compensation of 180° is encoded as "1".

[0072] Specifically, the actual phase compensation value of the i-th unit of the first digital coding surface is:

[0073]

[0074] In formula (4), represents the actual phase compensation value of the i-th unit on the first digitally coded metasurface, represents the compensation phase of the i-th unit.

[0075] Then, the corresponding encoding is expressed as:

[0076]

[0077] In this embodiment, the units corresponding to the two metasurfaces are set to opposite 0 / 1 codes, that is, the codes of the units on the other digitally coded metasurface are set to the opposite values ​​of the codes of the units at the same position on the first digitally coded metasurface.

[0078] Specifically, the quantization rule of the i-th unit of the second digitally coded metasurface adopts the following formula:

[0079]

[0080] In step S130, the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns is determined based on the angle between the line of sight of the digitally coded metasurface and the interfered radar, using the following two formulas:

[0081]

[0082] In formula (7) and formula (8), θ r represents the angle between the digitally coded metasurface and the line of sight of the interfered radar, d represents the distance between the monopulse antennas, and λ represents the radar operating wavelength. Either a1 or a2 is arbitrarily selected as the amplitude ratio.

[0083] When two digitally coded metasurfaces transmit the modulated jamming signal to the monopulse radar for jamming, the relative position relationship among the metasurface jammer, the protected target and the monopulse radar is as follows: Figure 2 The two metasurfaces are placed on both sides of the protected target, with an angle of θ between them and the visual axis. r and -θ r , where the negative sign indicates the direction below the x-axis. The monopulse radar spacing d is set to half a wavelength. Under far-field conditions, two interference signals enter the two monopulse radar antennas respectively. The two monopulse radar antennas receive interference signals from two different directions, which can be written as:

[0084] P t 1 =1 (9)

[0085]

[0086] P t 2 =-a (11)

[0087]

[0088] The total sum channel signal is:

[0089]

[0090] The total difference channel signal is:

[0091]

[0092] Furthermore, the single pulse indication angle is:

[0093]

[0094] In formula (15), Im(·) represents the imaginary part, and ξ represents the slope coefficient of the monopulse radar.

[0095] Then, by finding the extreme value of formula (15), two extreme points can be obtained, which are a1 or a2 of formula (7) and formula (8). The amplitude ratio has the largest angle measurement deviation at a1 and a2, and the angle interference is the largest.

[0096] In step S140, after determining the amplitudes of the signals transmitted by the two digitally coded metasurface feed horns, it is assumed that the signal transmitted by the first digitally coded metasurface feed horn is s 1 , then the transmission signal of the second digital coding metasurface is set to: s 2 =as 1 , where a is the amplitude ratio. The two transmitted signals are modulated by the corresponding encoded digital coding metasurface to generate the final interference signal, which is then transmitted to the monopulse radar for interference.

[0097] In order to further verify the effectiveness of the present invention, three simulation experiments are used to illustrate it.

[0098] Experiment 1 verifies that the angle θ between the digital coding metasurface and the radar boresight r Under the condition of fixed constant, the effect of changing the amplitude ratio a of the two interference signals on the angle measurement results of the single pulse radar is shown in Figure 1. r =1°, control a to change between (0,2), and obtain the corresponding single pulse radar angle measurement results as follows Figure 4 As shown. r =1°Substituting into equations (14) and (15), we can obtain a1=1.0564 and a2=0.9466. Figure 4 It can be seen that controlling the amplitude ratio to an appropriate range can interfere with the monopulse radar angle measurement. This also verifies the correctness of the derived formula. The angle interference is the greatest when the amplitude ratios a1 = 1.0564 and a2 = 0.9466.

[0099] Experiment 2 verifies that when the amplitude ratio of the two interference signals remains unchanged, the angle θ between the digital coding metasurface and the radar axis of sight is changed. r The effect of single pulse radar angle measurement results. Set a = 1.0564, control θ r Changing between (0°, 10°), the corresponding single pulse radar angle measurement results are obtained as follows Figure 5 As shown. Figure 5 It can be seen that under the same amplitude ratio, different θ r The interference effect is different. When a=1.0564, the r =1°, the maximum interference level can be achieved, which is consistent with the results of Experiment 1.

[0100] Experiment 3 verifies that the angle measurement deviation angle reaches θ r When the multiples are different, θ rThe range of values ​​of and a, this relationship can be analyzed using contour lines. Figure 6 As shown, the contour lines with multiples of 10, 20, 50, and 100 are selected. When θ r When and a are above a specific contour line, the cross-eye interference can obtain the corresponding angle interference multiple; when the value is within the specific contour line, the cross-eye interference can obtain a multiple greater than the corresponding angle interference multiple.

[0101] In the above-mentioned cross-eye jamming method based on digitally coded metasurfaces, the digitally coded metasurface is used as the antenna structure of the cross-eye jammer, and the protected target is located at the center of the line connecting the two digitally coded metasurfaces. When the line of sight of the single-pulse radar points in the direction of the protected target, the unit codes corresponding to the beams of the two digitally coded metasurfaces pointing in the direction of the radar are designed. The interference signal emitted by the digitally coded metasurface is amplitude-controlled, and the interference signal modulated by the two digitally coded metasurfaces is transmitted to the single-pulse radar. The single-pulse radar compares the phases of the sum and difference channel signals to measure the angle, thereby inducing the single-pulse radar to deviate from the true target direction and achieve angle deception of the single-pulse radar. This method utilizes the inverted phase characteristics of the coding unit of the digitally coded metasurface to achieve precise control of the 180° phase difference between the two interference signals in the cross-eye jamming. Compared with traditional jamming antennas, digitally coded metasurfaces have low cost and can flexibly control beam pointing.

[0102] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0103] In one embodiment, a cross-eye jamming device based on a digitally coded metasurface is provided. The device includes two digitally coded surfaces as antenna structures. The protected target is located on the line of sight of a single-pulse radar. The two digitally coded metasurfaces are symmetrically arranged on both sides of the protected target in the direction of the line of sight. The above-mentioned cross-eye jamming method based on the digitally coded metasurface is implemented in the device.

[0104] In one embodiment, Figure 7As shown, a cross-eye jamming device based on a digitally coded metasurface is also provided, which includes: an interference signal information acquisition module 200, a compensation phase acquisition module 210, a digitally coded metasurface encoding module 220, an amplitude ratio acquisition module 230, and an interference signal generation module 240, wherein:

[0105] The interference signal information acquisition module 200 is used to obtain the pitch angle, azimuth angle and signal amplitude of the interference wave signal beam to be modulated;

[0106] The compensation phase obtaining module 210 is used to select any digitally coded metasurface as the first digitally coded metasurface, and calculate the compensation phase of each unit based on the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface;

[0107] a digitally coded metasurface encoding module 220, configured to determine a single-bit encoding of each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determine a single-bit encoding on another digitally coded metasurface according to the single-bit encoding on the first digitally coded metasurface;

[0108] An amplitude ratio obtaining module 230 is configured to determine an amplitude ratio of signals transmitted by two digitally coded metasurface feed horns based on an angle between the digitally coded metasurface and the line of sight of the interfered radar;

[0109] The interference signal generation module 240 is used for the two digitally coded metasurface feed horns to transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to achieve interference with the single-pulse radar.

[0110] For the specific definition of the cross-eye interference equipment based on the digitally coded metasurface, please refer to the definition of the cross-eye interference method based on the digitally coded metasurface above, which will not be repeated here. Each module in the above-mentioned cross-eye interference equipment based on the digitally coded metasurface can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0111] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 8As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a cross-eye interference method based on a digitally coded metasurface is implemented. The display screen of the computer device can be a liquid crystal display or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad provided on the computer device housing, or an external keyboard, touchpad or mouse.

[0112] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0113] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0114] Obtaining the elevation angle, azimuth angle, and signal amplitude of the interference wave signal beam to be modulated;

[0115] Select any digitally coded metasurface as the first digitally coded metasurface, and calculate the compensation phase of each unit according to the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface;

[0116] Determine a single-bit code on each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determine a single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface;

[0117] Determining the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns according to the angle between the line of sight of the digitally coded metasurface and the interfered radar;

[0118] The two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the monopulse radar.

[0119] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0120] Obtaining the elevation angle, azimuth angle, and signal amplitude of the interference wave signal beam to be modulated;

[0121] Select any digitally coded metasurface as the first digitally coded metasurface, and calculate the compensation phase of each unit according to the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface;

[0122] Determine a single-bit code on each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determine a single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface;

[0123] Determining the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns according to the angle between the line of sight of the digitally coded metasurface and the interfered radar;

[0124] The two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the monopulse radar.

[0125] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0126] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A cross-eye interference method based on digitally coded metasurface, characterized in that: The method is implemented in a cross-eye jamming device, the cross-eye jamming device including two digitally coded metasurfaces as antenna structures. When a protected target is located on the line of sight of a monopulse radar, the two digitally coded metasurfaces are symmetrically arranged on either side of the protected target in the direction of the line of sight. The method includes: Obtaining the elevation angle, azimuth angle, and signal amplitude of the interference wave signal beam to be modulated; Select any digitally coded metasurface as the first digitally coded metasurface, and calculate the compensation phase of each unit according to the pitch angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface; Determine a single-bit code on each unit on the first digitally coded metasurface according to the compensation phase of each unit, and determine a single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface; Determining the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns according to the angle between the line of sight of the digitally coded metasurface and the interfered radar; The two digitally coded metasurface feed horns transmit signals to the corresponding encoded digitally coded metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the monopulse radar.

2. The cross-eye interference method based on digitally coded metasurface according to claim 1 is characterized in that The step of calculating the compensation phase of each unit according to the elevation angle and azimuth angle of the interference wave signal beam to be modulated, the coordinates of the feed horn, and the coordinates of each unit on the digitally coded metasurface includes: Calculate the distance between the feed horn and each unit on the digitally coded metasurface based on the coordinates of the feed horn and the coordinates of each unit, and obtain the incident phase of each unit based on the distance; Calculating the output phase of each unit according to the elevation angle and azimuth angle of the interference wave signal beam to be modulated and the coordinates of each unit; According to the incident phase and the outgoing phase on each unit, the compensation phase of each unit is obtained.

3. The cross-eye interference method based on digitally coded metasurface according to claim 1, characterized in that Determining the single-bit code of each unit on the first digitally coded metasurface according to the compensation phase of each unit includes: Determine the actual phase compensation value corresponding to each unit according to the compensation phase, wherein the actual phase compensation is 0° or 180°; The cells on the first digital coding surface with an actual phase compensation of 0° are encoded as “0”, and the cells on the first digital coding surface with an actual phase compensation of 180° are encoded as “1”.

4. The cross-eye interference method based on digitally coded metasurface according to claim 3 is characterized in that The actual phase compensation value corresponding to each unit is determined according to the compensation phase, using the following formula: In the above formula, represents the actual phase compensation value of the i-th unit on the first digitally coded metasurface, represents the compensation phase of the i-th unit.

5. The cross-eye interference method based on digitally coded metasurface according to claim 4 is characterized in that: Determining a single-bit code on another digitally coded metasurface according to the single-bit code on the first digitally coded metasurface includes: The code of each unit on another digitally coded metasurface is set to the opposite value of the code of the unit at the same position on the first digitally coded metasurface.

6. The cross-eye interference method based on digitally coded metasurface according to claim 5, characterized in that: According to the angle between the line of sight of the digitally coded metasurface and the radar being interfered with, the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns is determined using the following two formulas: In the above formula, θ r represents the angle between the digital coding metasurface and the line of sight of the interfered radar, d represents the spacing between the single pulse antennas, λ represents the radar operating wavelength, and a1 or a2 is arbitrarily selected as the amplitude ratio.

7. A cross-eye jammer based on a digitally coded metasurface, characterized in that: The equipment includes two digitally coded metasurfaces as antenna structures. If the protected target is located on the line of sight of the monopulse radar, the two digitally coded metasurfaces are symmetrically arranged on both sides of the protected target in the direction of the line of sight. The cross-eye interference method based on digitally coded metasurface according to any one of claims 1 to 6 is implemented in the equipment.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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