Cross-eye interference method, equipment, equipment and medium based on digital coding metasurface

Abstract

The invention relates to a digital coding metasurface-based cross-eye interference method, equipment, equipment and a medium, and the method comprises the steps: taking two digital coding surfaces as antenna structures in the cross-eye interference equipment, symmetrically arranging the two digital coding surfaces at the two sides of a protected target in a monopulse radar visual axis direction, and selecting any one digital coding metasurface, calculating according to wave beam information of interference wave signals to be modulated, a feed source horn and coordinates of all units on the digital coding metasurface to obtain compensation phases of all the units and coding, determining codes on the other metasurface according to the codes on the metasurface, and according to an included angle of a connecting line of a visual axis of the digital coding metasurface and the interfered radar, calculating the interference wave signal to be modulated according to the interference wave signal to be modulated. And determining the amplitude ratio of the two feed source horn emission signals, and generating a modulated interference signal according to the signal amplitude, the amplitude ratio and the two coded digital coding metasurfaces. By adopting the method, the cost can be effectively reduced, and the modulation signal beam pointing can be flexibly controlled.

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] Single-pulse radar technology is mainly used to measure the angular position information of the target. It can determine the angle information of the target 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 single-pulse radar has always been a hot issue in the field of radar countermeasures.

[0003] Cross-eye jamming is a coherent jamming method that can effectively interfere with monopulse radar. By configuring it on the protected platform, it can cause the monopulse radar to point in a direction outside the solid angle of the protected platform, thereby interfering with the angle measurement. The core of the cross-eye jamming method is to achieve the coherence of the two interference sources by accurately and stably controlling the amplitude and phase of the two interference sources in the platform. Generally, it is necessary to meet the conditions that the phase difference of the two interference source signals is 180° and the amplitude ratio is close to 1.

[0004] However, most existing cross-eye interference antennas use mechanical rotation, and the beam pointing adjustment speed is slow. The digital coded metasurface can control the signal phase, direction and other characteristics by controlling the coding of the coding unit. Compared with traditional antennas, it has the advantages of fast signal direction control speed and high flexibility. In addition, the digital coded metasurface can continue to work even if a few coding units are damaged, which improves the reliability of the system. 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 in response to the above-mentioned technical problems.

[0006] A cross-eye jamming method based on a digitally coded metasurface is implemented in a cross-eye jamming device, wherein the cross-eye jamming device includes two digitally coded surfaces as antenna structures, and a protected target is located on the visual axis of a monopulse radar. The two digitally coded metasurfaces are symmetrically arranged on both sides of the protected target in the direction of the visual axis. 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 one digitally coded metasurface as the first digitally coded metasurface, and calculate 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 to obtain the compensation phase of each unit;

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

[0010] 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;

[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 achieve interference with the single-pulse radar.

[0012] In one embodiment, the calculation is performed based on 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 to obtain the compensation phase of each unit, including:

[0013] Calculating according to the coordinates of the feed horn and the coordinates of each unit on the digitally coded metasurface to obtain the distance between the feed horn and each unit, and obtaining the incident phase of each unit according to the distance;

[0014] Calculating according to the elevation angle, azimuth angle of the interference wave signal beam to be modulated and the coordinates of each unit to obtain the emission phase 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 digital coding 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 whose actual phase compensation is 0° are encoded as “0”, and the cells on the first digital coding surface whose actual phase compensation is 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 digital coding metasurface, represents the compensation phase of the ith unit.

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

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

[0024] In one embodiment, the amplitude ratio of the signals transmitted by the two digitally coded metasurface feed horns is determined according to 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 digital coding metasurface and the line of sight of the interfered radar, d represents the distance between the single pulse antennas, and λ represents the radar operating wavelength. a1 or a2 is arbitrarily selected as the amplitude ratio.

[0028] The present application also provides a cross-eye jammer based on a digitally coded metasurface, the equipment comprising two digitally coded surfaces as antenna structures, the protected target is located on the visual axis of the monopulse radar, and the two digitally coded metasurfaces are symmetrically arranged on both sides of the protected target in the direction of the visual axis;

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

[0030] A computer device comprises 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 one digitally coded metasurface as the first digitally coded metasurface, and calculate 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 to obtain the compensation phase of each unit;

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

[0034] 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;

[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 achieve interference with the single-pulse 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 one digitally coded metasurface as the first digitally coded metasurface, and calculate 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 to obtain the compensation phase of each unit;

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

[0040] 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;

[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 achieve interference with the single-pulse radar.

[0042] The cross-eye interference method, equipment, device and medium based on digital coding metasurface are as follows: in the cross-eye interference equipment, two digital coding surfaces are used as antenna structures, and are symmetrically arranged on both sides of the protected target in the direction of the line of sight of the monopulse radar, and any one digital coding metasurface is selected as the first digital coding metasurface, and the compensation phase of each unit is obtained 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 digital coding metasurface, and the single-bit coding of each unit on the first digital coding metasurface is determined according to the compensation phase of each unit, and the single-bit coding on the other digital coding metasurface is determined according to the single-bit coding on the first digital coding metasurface. According to the angle between the digital coding metasurface and the line of sight of the interfered radar, the amplitude ratio of the transmitted signals of the two digital coding metasurface feed horns is determined, and the two digital coding metasurface feed horns transmit signals to the corresponding encoded digital coding metasurface according to the signal amplitude and amplitude ratio, and the modulated interference signal is generated by the two digital coding metasurfaces to achieve interference with the monopulse radar. The method can effectively reduce costs and flexibly control the pointing direction of the modulated signal beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of 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 of 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 angle measurement results under different amplitude ratios in an experiment;

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

[0048] Figure 6 It is a contour map when different interference angle multiples are reached in an experiment;

[0049] Figure 7 A structural block diagram of a cross-eye interference device based on a digitally coded metasurface in one embodiment;

[0050] Figure 8 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] The existing technical solutions for realizing 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, in which two digitally coded surfaces are included 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 line of sight direction. The method specifically includes the following steps:

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

[0054] Step S110, select any digital coding metasurface as the first digital coding metasurface, calculate 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 digital coding metasurface, and obtain the compensation phase of each unit.

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

[0056] Step S130, determining 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 metasurfaces according to the signal amplitude and amplitude ratio, and the two digitally coded metasurfaces generate modulated interference signals to interfere with the single-pulse radar.

[0058] In this method, a digitally coded metasurface is used as the antenna structure of the cross-eye jammer. The digitally coded metasurface is an advanced electromagnetic material that performs single-bit quantization encoding of "0" and "1" on each unit, which is equivalent to phase-modulating the signal at "0°" and "180°". Compared with traditional horn antennas, digitally coded metasurfaces have the advantages of low cost and flexible beam pointing. Using digitally coded metasurfaces as the antenna structure in cross-eye jammers can achieve the jamming effect on single-pulse radars while having the advantages of low cost and flexible regulation.

[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 visual axis of the single-pulse radar, and the two digitally coded metasurfaces are symmetrically arranged on both sides of the visual axis 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 is proposed. The digitally coded metasurface unit can be used to precisely design the "0" and "1" single-bit quantization codes to perform "0°" and "180°" phase control on the signal to achieve the direction control of the transmitted beam. The corresponding units of the two digitally coded metasurfaces are combined to set opposite codes to achieve a 180° phase difference in the signals transmitted by the two digitally coded metasurfaces. The amplitude control of the digitally coded metasurface is used to achieve angle deception interference on the single-pulse radar.

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

[0062] In step S110, the compensation phase of each unit is obtained by calculating 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 digital coding metasurface, including: calculating according to the coordinates of the feed horn and the coordinates of each unit on the digital coding metasurface, obtaining the distance between the feed horn and each unit, and obtaining the incident phase of each unit according to the distance. Calculating according to the elevation angle and azimuth angle of the interference wave signal beam to be modulated and the coordinates of each unit, obtaining the exit phase of each unit. Finally, the compensation phase of each unit is obtained according to 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 coding to achieve directional control of the emitted 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 only two discrete phase values, 0° and 180°, can be compensated for a single-bit digital coding metasurface, the single-bit coding of each unit on the first digital coding metasurface is determined according to the compensation phase of each unit, including: determining the actual phase compensation value of each unit according to the compensation phase, and the actual phase compensation is 0° or 180°. The unit on the first digital coding surface with an actual phase compensation of 0° is encoded as "0", and the unit on the first digital coding surface 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 digital coding metasurface, represents the compensation phase of the ith unit.

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

[0076]

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

[0078] Specifically, the quantization rule of the i-th unit of the second digitally encoded hypersurface is as follows:

[0079]

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

[0081]

[0082] In formula (7) and formula (8), θ r represents the angle between the digital coding metasurface and the line of sight of the interfered radar, d represents the distance between the single pulse antennas, and λ represents the radar operating wavelength. 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 between 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 line connecting the visual axis. r and -θ r , the negative sign represents below the x-axis. The single pulse radar spacing d is set to half a wavelength. Under far-field conditions, the two interference signals enter the two single pulse radar antennas respectively. The two antennas of the single pulse radar receive interference signals from two directions respectively, 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 single pulse 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), respectively. The angle measurement deviation of the amplitude ratio at a1 and a2 is the largest, and the angle interference degree 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 single pulse 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 the angle θ between the digital coding metasurface and the radar line of sight. r Under the condition of fixed constant, the influence of changing the amplitude ratio a of the two interference signals on the angle measurement result of the single pulse radar. Set θ r = 1°, control a to change between (0, 2), and obtain the corresponding single pulse radar angle measurement result as follows Figure 4 As shown. r =1° Substituting into equation (14) and equation (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 single pulse radar angle measurement. At the same time, the correctness of the derived formula is also verified. When the amplitude ratio is a1=1.0564 and a2=0.9466, the angle interference is the greatest.

[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 line of sight is changed. r The effect on the angle measurement results of the single pulse radar. 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, at θ 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 relationship between and a can be analyzed using contour lines. Figure 6 As shown in the figure, contour lines with multiples of 10, 20, 50, and 100 are selected. r When and a are above a specific contour line, the cross-eye interference can obtain a corresponding angle interference multiple; when the value is within a specific contour line, the cross-eye interference can obtain a multiple greater than the corresponding angle interference multiple.

[0101] In the above cross-eye jamming method based on digitally coded metasurface, the protected target is located at the center of the line connecting two digitally coded metasurfaces by using the digitally coded metasurface as the antenna structure of the cross-eye jammer. When the single-pulse radar's line of sight 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, inducing the single-pulse radar to deviate from the direction of the real target, thereby achieving angle deception of the single-pulse radar. This method utilizes the inverted characteristics of the coding unit of the digitally coded metasurface to achieve precise control of the 180° phase difference of the two interference signals in the cross-eye jamming. Compared with traditional jamming antennas, digitally coded metasurfaces have low costs 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. Moreover, 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 jammer based on a digitally coded metasurface is provided. The equipment 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 jammer method based on the digitally coded metasurface is implemented in the equipment.

[0104] In one embodiment, Figure 7As shown, a cross-eye interference equipment based on a digital coding metasurface is also provided, the equipment comprising: an interference signal information acquisition module 200, a compensation phase acquisition module 210, a digital coding 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 one 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;

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

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

[0109] The interference signal generating module 240 is used for 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 to 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 in 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 through a system bus. Among them, 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 through a network connection. When the computer program is executed by the processor, a cross-eye interference method based on a digitally encoded metasurface is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a button, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[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 those shown in the figure, or combine certain components, or have a different arrangement of components.

[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 one digitally coded metasurface as the first digitally coded metasurface, and calculate 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 to obtain the compensation phase of each unit;

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

[0117] 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;

[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 achieve interference with the single-pulse radar.

[0119] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and 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 one digitally coded metasurface as the first digitally coded metasurface, and calculate 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 to obtain the compensation phase of each unit;

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

[0123] 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;

[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 achieve interference with the single-pulse radar.

[0125] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and 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. As an illustration and not limitation, RAM is available in many 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 may 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-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A cross-eye interference method based on digitally coded metasurface, characterized in that: The method is implemented in a cross-eye jammer, the cross-eye jammer comprising two digitally coded metasurfaces as antenna structures, the protected target is located on the visual axis 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 visual axis. The method comprises: Obtaining the elevation angle, azimuth angle and signal amplitude of the interference wave signal beam to be modulated; Select any one digitally coded metasurface as the first digitally coded metasurface, and calculate 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 to obtain the compensation phase of each unit; Determine the single-bit code of each unit on the first digital coding metasurface according to the compensation phase of each unit, and determine the single-bit code on another digital coding metasurface according to the single-bit code on the first digital coding metasurface; 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; 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 achieve interference with the single-pulse 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 digital coding metasurface includes: Calculating according to the coordinates of the feed horn and the coordinates of each unit on the digitally coded metasurface to obtain the distance between the feed horn and each unit, and obtaining the incident phase of each unit according to the distance; Calculating according to the elevation angle and azimuth angle of the interference wave signal beam to be modulated and the coordinates of each unit to obtain the emission phase 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 digital coding 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 whose actual phase compensation is 0° are encoded as “0”, and the cells on the first digital coding surface whose actual phase compensation is 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 digital coding metasurface, represents the compensation phase of the ith 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 comprises: The code of each unit on another digitally coded hypersurface is set to the opposite value of the code of the unit at the same position on the first digitally coded hypersurface.

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 interfered radar, 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 distance between the single pulse antennas, and λ represents the radar operating wavelength. 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 digital coding metasurfaces as antenna structures, and the protected target is located on the line of sight of the monopulse radar, and the two digital coding 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 described in 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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