Ultra-wideband multi-bit phase-encoded cellular electromagnetic unit, structure and determination method

Abstract

The present invention discloses a cellular electromagnetic unit, structure and determination method for ultra-wideband multi-bit phase coding, wherein the cellular electromagnetic unit comprises a cellular lattice structure, and several adjacent side walls of the cellular lattice structure are provided with an electromagnetic resonance response structure, and the electromagnetic resonance response structure comprises a preset metal patch pattern, and the shape of the preset metal patch pattern comprises an H-type, and the structural parameters of the preset metal patch pattern are determined according to the reflection phase; the cellular electromagnetic structure comprises a substrate and several of the above-mentioned cellular electromagnetic units arranged on the substrate, and the cellular electromagnetic units are arranged in an array form, and the reflection phase of the cellular electromagnetic unit is determined according to the bit phase coding. The embodiment of the present invention can effectively reduce the radar scattering cross section under ultra-wideband and large angle conditions, has the physical characteristics of light weight and high mechanical strength, and can be widely used in the field of radar detection technology.

Description

Technical Field

[0001] The present invention relates to the field of radar detection technology, and in particular to an ultra-wideband multi-bit phase-coded cellular electromagnetic unit, structure and determination method. Background Art

[0002] Electromagnetic stealth technology can effectively reduce the probability of a target object being detected by radar or other electromagnetic detection systems. Reducing the radar cross section (RCS) can significantly enhance stealth capabilities and improve the survivability of targets, which has an urgent application demand in the field of aerospace engineering. At present, the main technical means of reducing RCS in aircraft design are wave-absorbing stealth and scattering stealth.

[0003] Generally, the radar absorbing stealth technologies used in aerospace vehicles include equivalent circuit radar absorbing, metamaterial radar absorbing and coating radar absorbing design methods. Equivalent circuit radar absorbing technology simulates the electromagnetic properties of radar absorbing materials through a combination of resistors, inductors and capacitors. It has the advantages of fast design speed and wide application range, but it has the disadvantage of narrow radar absorbing bandwidth. Metamaterial radar absorbing is a method of using artificially designed structures to achieve special electromagnetic properties. It has the advantage of low profile, but it also has the problem of narrow absorption bandwidth. Coating radar absorbing technology can work effectively within a fairly large bandwidth range and maintain excellent working performance at large angles of incidence; however, in order to achieve low-frequency or wider bandwidth absorption, the thickness of the coating needs to be increased, which may cause the weight to exceed the expected requirements and have an adverse effect on the maneuverability of the stealth aircraft.

[0004] As for the scattering stealth method, some metasurfaces based on scattering stealth technology have been designed to achieve RCS reduction. They can achieve RCS reduction in an ultra-wideband range and have the advantages of being ultra-thin and easy to manufacture. However, most of these metasurfaces are strictly limited to vertical incidence. Summary of the invention

[0005] In view of this, in order to solve one of the above problems, an embodiment of the present invention aims to provide an ultra-wideband multi-bit phase-coded cellular electromagnetic unit, structure and determination method, which can effectively reduce the radar scattering cross section under ultra-wideband and large-angle conditions.

[0006] On the one hand, an embodiment of the present invention provides an ultra-wideband multi-bit phase-encoded cellular electromagnetic unit, including a honeycomb lattice structure, wherein several adjacent side walls of the honeycomb lattice structure are provided with an electromagnetic resonance response structure, wherein the electromagnetic resonance response structure includes a preset metal patch pattern, wherein the shape of the preset metal patch pattern includes an H-shape, and the structural parameters of the preset metal patch pattern are determined according to the reflection phase.

[0007] Optionally, the midpoint of the preset metal patch pattern is located on the center line of the side wall in a vertical direction.

[0008] Optionally, an inner wall or an outer wall of the honeycomb electromagnetic unit is provided with a preset metal patch pattern.

[0009] Optionally, the middle connecting line of the H-shaped preset metal patch pattern includes a straight line or a curve.

[0010] The implementation of the embodiment of the present invention includes the following beneficial effects: In this embodiment, a metal patch pattern in an H-shape is printed on the inner side wall of the honeycomb cell structure as an electromagnetic resonance response structure. By adjusting the structural parameters of the metal patch pattern to control the reflection phase, an ultra-wideband reflection phase gradient performance can be obtained, and at the same time, its incident angle can be further increased to reduce the radar scattering cross section; in addition, the honeycomb electromagnetic unit does not need an absorbing coating to reduce weight. By symmetrically arranging the metal patch patterns of each unit, good dual-polarization electromagnetic scattering control performance can be achieved within the operating frequency range.

[0011] On the other hand, an embodiment of the present invention provides an ultra-wideband multi-bit phase-coded cellular electromagnetic structure, comprising a substrate and a plurality of the above-mentioned cellular electromagnetic units arranged on the substrate, wherein the cellular electromagnetic units are arranged in an array form, and the reflection phase of the cellular electromagnetic unit corresponds to the coding bit of the multi-bit phase coding.

[0012] Optionally, the dielectric material of the honeycomb electromagnetic structure includes a lightweight material, and the lightweight material includes aramid paper or polyimide.

[0013] Optionally, the thickness of the dielectric material of the honeycomb electromagnetic structure is in the range of 0.05 to 0.07 mm.

[0014] Optionally, the flatness of the substrate is within a preset range, and the material of the substrate includes metal.

[0015] The implementation of the embodiment of the present invention includes the following beneficial effects: In this embodiment, the honeycomb electromagnetic structure controls the backscattering of electromagnetic waves by adjusting the reflection phase of each honeycomb electromagnetic unit to reduce the radar scattering cross section. At the same time, the honeycomb electromagnetic units are arranged in an array form, which has high mechanical strength and has potential application value in the field of radar detection technology, which is conducive to large-scale production. In addition, the material of the honeycomb electromagnetic structure is an ultra-thin dielectric material, which can reduce weight. The material of the substrate is metal, which can reduce reflection loss.

[0016] On the other hand, an embodiment of the present invention provides a method for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic unit, comprising:

[0017] Determining the reflected phase of the bit phase encoding according to the profile height of the honeycomb electromagnetic unit;

[0018] Input the reflection phase into the trained first generation model to determine equivalent circuit parameters, and determine port network parameters according to the equivalent circuit parameters;

[0019] Inputting the port network parameters into the trained second generation model to determine the structural parameters of the metal patch pattern;

[0020] A honeycomb electromagnetic unit is determined according to the equivalent circuit parameters and the structural parameters of the metal patch pattern.

[0021] Optionally, the port network parameters include S 11 parameter, S 21 parameter, Z 11 Parameter or Z 21 Any of the parameters.

[0022] The implementation of the embodiment of the present invention includes the following beneficial effects: in this embodiment, equivalent circuit parameters are generated by the reflection phase and the first generation model, and the port network parameters are determined according to the equivalent circuit parameters, the structural parameters of the metal patch pattern are generated by the port network parameters and the second generation model, and finally the cellular electromagnetic unit is determined according to the equivalent circuit parameters and the structural parameters of the metal patch pattern, and the first generation model and the second generation model are used jointly to quickly and accurately determine the cellular electromagnetic unit.

[0023] On the other hand, an embodiment of the present invention provides a method for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic structure, comprising:

[0024] Determining an initial array arrangement of honeycomb electromagnetic units in the honeycomb electromagnetic structure;

[0025] The initial array arrangement of the honeycomb electromagnetic units is updated according to a preset algorithm and a preset objective function until preset requirements are met, thereby determining the honeycomb electromagnetic structure.

[0026] The implementation of the embodiment of the present invention includes the following beneficial effects: In this embodiment, the initial array arrangement of the honeycomb electromagnetic units in the honeycomb electromagnetic structure is first determined, and then the initial array arrangement of the honeycomb electromagnetic units is updated through a preset algorithm and a preset objective function, thereby optimizing the arrangement of the honeycomb electromagnetic structure and further reducing the radar scattering cross section.

[0027] On the other hand, an embodiment of the present invention provides a device for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic unit, comprising:

[0028] at least one processor;

[0029] at least one memory for storing at least one program;

[0030] When the at least one program is executed by the at least one processor, the at least one processor implements the above-mentioned method for determining the cellular electromagnetic unit.

[0031] On the other hand, an embodiment of the present invention provides a device for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic structure, comprising:

[0032] at least one processor;

[0033] at least one memory for storing at least one program;

[0034] When the at least one program is executed by the at least one processor, the at least one processor implements the above-mentioned method for determining the cellular electromagnetic structure.

[0035] On the other hand, an embodiment of the present invention provides a computer-readable storage medium storing a program executable by a processor, wherein the program executable by the processor is used to execute the above-mentioned method for determining a cellular electromagnetic unit or a method for determining a cellular electromagnetic structure when executed by the processor.

[0036] The implementation of the embodiments of the present invention includes the following beneficial effects: the device for determining the cellular electromagnetic unit in the embodiment implements the function of the method for determining the cellular electromagnetic unit, the device for determining the cellular electromagnetic structure implements the function of the method for determining the cellular electromagnetic structure, and the computer-readable storage medium implements the function of the method for determining the cellular electromagnetic unit or the function of the method for determining the cellular electromagnetic structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of an ultra-wideband multi-bit phase-encoded cellular electromagnetic unit provided by an embodiment of the present invention;

[0038] Figure 2 A structural schematic diagram of an ultra-wideband multi-bit phase-coded cellular electromagnetic structure and an equivalent circuit diagram of a cellular electromagnetic unit provided by an embodiment of the present invention;

[0039] Figure 3 A flowchart of a method for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic unit provided by an embodiment of the present invention;

[0040] Figure 4 A training flow chart of a first generation model provided by an embodiment of the present invention;

[0041] Figure 5 An ideal reflection phase distribution diagram of an ultra-wideband multi-bit phase-coded cellular electromagnetic unit provided in an embodiment of the present invention;

[0042] Figure 6A reflection phase distribution diagram generated by a first generation model provided in an embodiment of the present invention;

[0043] Figure 7 A training flow chart of a first generation model provided by an embodiment of the present invention;

[0044] Figure 8 A metal patch structure in an ultra-wideband multi-bit phase-coded cellular electromagnetic unit and its equivalent circuit provided by an embodiment of the present invention;

[0045] Fig. 9 A schematic diagram of a 4-bit honeycomb electromagnetic structure generated by a second generation model provided in an embodiment of the present invention;

[0046] Fig.10 A full-wave simulated reflection phase distribution diagram of a 4-bit honeycomb electromagnetic structure generated by a second generation model provided in an embodiment of the present invention;

[0047] Fig.11 A flowchart of a method for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic structure provided by an embodiment of the present invention;

[0048] Fig.12 A schematic diagram of the arrangement of a honeycomb electromagnetic structure for realizing abnormal beam deflection and reflection provided by an embodiment of the present invention;

[0049] Fig.13 A schematic diagram of a full-wave simulation of abnormal beam deflection and reflection provided by an embodiment of the present invention;

[0050] Fig.14 A schematic diagram of a cellular electromagnetic structure for achieving RCS reduction provided by an embodiment of the present invention;

[0051] Fig.15 A schematic diagram of a random scattering full-wave simulation provided by an embodiment of the present invention;

[0052] Fig.16 A single-station RCS reduction curve diagram provided by an embodiment of the present invention;

[0053] Fig.17 A schematic diagram of the structure of a system for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic unit provided by an embodiment of the present invention;

[0054] Fig.18 A schematic diagram of the structure of a system for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic structure provided by an embodiment of the present invention;

[0055] Fig.19 A schematic structural diagram of a device for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic unit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only provided for the convenience of explanation and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0057] See also Figure 1 and Figure 2 An embodiment of the present invention provides an ultra-wideband multi-bit phase-encoded cellular electromagnetic unit, comprising a cellular lattice structure (1-1), wherein a plurality of adjacent side walls of the cellular lattice structure (1-1) are provided with an electromagnetic resonance response structure (1-2), wherein the electromagnetic resonance response structure (1-2) comprises a preset metal patch pattern (1-3), wherein the shape of the preset metal patch pattern (1-3) comprises an H-shape, and the structural parameters of the preset metal patch pattern (1-3) are determined according to the reflection phase.

[0058] The bit position of the multi-bit phase encoding is determined according to the actual application and can be 1 bit, 2 bits, 3 bits, ..., N The electromagnetic resonance response structures of different honeycomb grid structures are different, and the reflection phase of each bit phase encoding is different, that is, the metal patch pattern corresponding to each bit phase encoding is different.

[0059] The number of side walls of the honeycomb electromagnetic unit is determined according to the actual application, and this embodiment does not impose any specific restrictions. For example, the number of side walls of the honeycomb electromagnetic unit is 4, 6 or 8. When the number of side walls of the honeycomb electromagnetic unit is 6, the structure of the honeycomb electromagnetic unit is hexagonal. The number of inner side walls of the honeycomb cell structure on which the electromagnetic resonance response structure is arranged is determined according to the number of side walls of the honeycomb cell structure. For example, if the honeycomb cell structure is hexagonal, three adjacent inner side walls and outer side walls of the honeycomb cell structure are provided with electromagnetic resonance response structures.

[0060] The shape of the preset metal patch pattern includes but is not limited to H-type, which refers to a shape similar to an H structure, and can be appropriately deformed or extended based on the H structure. The structural parameters of the preset metal patch pattern include but are not limited to the height parameters and shape parameters of the preset metal patch pattern.

[0061] In a specific embodiment, Figure 2 As shown in (a), the honeycomb electromagnetic unit uses ultra-thin dielectric core material to form a regular hexagonal honeycomb grid, and a group of identical metal patch patterns are printed on the inner wall of the honeycomb grid. Figure 2As shown in (b), each honeycomb cell achieves different reflection phases by printing a specific metal patch pattern on the side wall. The metal patch pattern is printed on three adjacent inner side walls of the honeycomb cell, and each honeycomb side wall has only one side printed with the metal patch pattern. Figure 2 As shown in (c), the metal patch pattern is used as an electromagnetic resonance response structure, and its shape is H-shaped. Figure 2 As shown in (d), the equivalent circuit of the metal patch pattern consists of a series LC Equivalent circuit representation.

[0062] Series LC The reflection phase of the equivalent circuit can be derived from the port network relationship. The reflection phase formula is as follows:

[0063] (1)

[0064] in,

[0065] (2)

[0066] (3)

[0067] ω is the angular frequency, L is the inductance of the resonant circuit, C is the capacitance value of the resonant circuit, Z 0 is the free space impedance, Θ1 and Θ2 are the corresponding transmission line electrical lengths, S 11 The parameter represents the return loss.

[0068] By adjusting the height of the arms at both ends of the H-shaped metal patch pattern and the gap between the two unit arms, the corresponding equivalent circuit can be changed. C The higher the height of the arms at both ends and the smaller the gap between the two unit arms, the smaller the equivalent circuit C The larger the value, the smaller the value. The middle line of the H type corresponds to the equivalent circuit. L The longer the line length and the smaller the width, the smaller the equivalent circuit L The larger the value, the lower the error and vice versa.

[0069] Therefore, according to formula (1), adjusting the shape and height of the metal patch pattern can be used to control the reflection phase, and the reflection phase gradient obtained by each unit has ultra-wideband performance.

[0070] Optionally, the midpoint of the preset metal patch pattern is located on the center line of the side wall in the vertical direction.

[0071] See also Figure 2In (c), the H-shaped metal patch pattern is horizontally symmetrical to the center of the honeycomb side wall, and the distances from the two edges of the metal patch pattern to the side wall edge are preset ( g ) are equal, thereby achieving dual-polarization electromagnetic performance.

[0072] Optionally, the inner side wall or the outer side wall of the honeycomb electromagnetic unit is provided with a preset metal patch pattern.

[0073] See also Figure 2 In (a), one of the inner sidewall or the outer sidewall of the honeycomb electromagnetic unit is provided with a preset metal patch pattern, such as a hexagonal honeycomb electromagnetic unit, three adjacent inner sidewalls are provided with metal patch patterns, and another three adjacent outer sidewalls are provided with metal patch patterns. The metal patch patterns of the inner sidewalls of the same honeycomb electromagnetic unit are the same, and the metal patch patterns of the outer sidewalls of the same honeycomb electromagnetic unit may be different.

[0074] Optionally, the middle connection line of the H-shaped preset metal patch pattern includes a straight line or a curve.

[0075] See also Figure 2 In (c), in order to achieve the design goal of miniaturization, the middle line of the H-shape includes straight lines or curved lines.

[0076] The implementation of the embodiment of the present invention includes the following beneficial effects: In this embodiment, a metal patch pattern in an H-shape is printed on the inner side wall of the honeycomb cell structure as an electromagnetic resonance response structure. By adjusting the structural parameters of the metal patch pattern to control the reflection phase, an ultra-wideband reflection phase gradient performance can be obtained, and at the same time, its incident angle can be further increased to reduce the radar scattering cross section; in addition, the honeycomb electromagnetic unit does not need an absorbing coating to reduce weight. By symmetrically arranging the metal patch patterns of each unit, good dual-polarization electromagnetic scattering control performance can be achieved within the operating frequency range.

[0077] See also Figure 2 In (a), an embodiment of the present invention provides an ultra-wideband multi-bit phase-encoded cellular electromagnetic structure, comprising a substrate (2-1) and a plurality of the above-mentioned cellular electromagnetic units arranged on the substrate (2-1), the cellular electromagnetic units being arranged in an array, and the reflection phase of the cellular electromagnetic units corresponding to the coding bit of the multi-bit phase encoding.

[0078] If represented by binary multi-bit coding bits, the corresponding number of units is 2 1 , 2 2 , 2 3 ,……,2 N .like Figure 2As shown in (c), the metal patch pattern is used as an electromagnetic resonance response structure, which has an H-shaped shape and has various forms, corresponding to multi-bit phase encoding units. The reflection phase gradients of adjacent units are the same, completing 360° reflection phase control.

[0079] It should be noted that the number of longitudinal units of the honeycomb electromagnetic unit in the honeycomb electromagnetic structure is M Number of lateral units N It should be more than 20, which can further reduce the radar cross section. The array arrangement is determined according to the actual application, such as the hexagonal honeycomb electromagnetic units are arranged in a co-edge array.

[0080] It should be noted that the size of the cellular electromagnetic unit is determined according to the range of the operating frequency, that is, Figure 2 In (b), the side length of the honeycomb electromagnetic unit (a) is determined according to the range of the operating frequency. Figure 2 In (b), 1-4 represent ultra-thin media.

[0081] Optionally, the dielectric material of the honeycomb electromagnetic structure includes a lightweight material, and the lightweight material includes aramid paper or polyimide.

[0082] Lightweight materials refer to materials with a weight density within a preset range, and lightweight materials include but are not limited to aramid paper or polyimide. Lightweight materials can reduce the weight of the honeycomb electromagnetic structure.

[0083] Optionally, the thickness of the dielectric material of the honeycomb electromagnetic structure ranges from 0.05 to 0.07 mm.

[0084] The thickness of the material of the honeycomb electromagnetic structure ranges from 0.05 to 0.07 mm, which reduces the radar cross section and reduces the weight of the honeycomb electromagnetic structure.

[0085] Optionally, the flatness of the substrate is within a preset range, and the material of the substrate includes metal.

[0086] The preset range is determined according to the actual application, and this embodiment does not impose a specific limitation, such as 0.01 mm. The material of the substrate includes but is not limited to metal, which can make the reflection nearly lossless. In a specific embodiment, the substrate is a reflective ground plane.

[0087] The implementation of the embodiment of the present invention includes the following beneficial effects: In this embodiment, the honeycomb electromagnetic structure controls the backscattering of electromagnetic waves by adjusting the reflection phase of each honeycomb electromagnetic unit to reduce the radar scattering cross section. At the same time, the honeycomb electromagnetic units are arranged in an array form, which has high mechanical strength and has potential application value in the field of radar detection technology. In addition, the material of the honeycomb electromagnetic structure is lightweight, which can reduce weight. The material of the substrate is metal, which can reduce reflection loss.

[0088] See also Figure 3 , an embodiment of the present invention provides a method for determining a cellular electromagnetic unit, comprising:

[0089] S110, determining a reflection phase of the bit phase encoding according to a cross-sectional height of the honeycomb electromagnetic unit.

[0090] In the operating frequency range, the reflection phase is determined according to the number of bit phase codes. For example, if represented by binary multi-bit coding bits, the corresponding number of units is 2 1 , 2 2 , 2 3 ,……,2 N , set the phase distribution of the first unit to the free space reflection phase with the honeycomb electromagnetic unit profile as the height, and the reflection phase interval between two adjacent units is: 360° / 2 N ,for N Bit phase coded n Unit, its phase distribution and the reflection phase interval of the first unit are: 360°×( n –1) / 2 N , thereby determining the reflection phase distribution of the ideal multi-bit phase encoding unit.

[0091] S120, inputting the reflection phase into the trained first generation model to determine equivalent circuit parameters, and determining port network parameters according to the equivalent circuit parameters.

[0092] It should be noted that the first generation model is a deep learning network model, including but not limited to a generative adversarial network, a variational autoencoder, an autoregressive model or a flow model. The first generation model needs to be trained before prediction. The input of the first generation model is the reflection phase, and the output of the first generation model is the equivalent circuit parameter. The training sample of the first generation model uses a known reflection phase and its corresponding equivalent circuit parameters. If the equivalent circuit parameters are known, the corresponding port network parameters are determined according to the calculation formula of the equivalent circuit parameters and the port network parameters.

[0093] Port network parameters include but are not limited to S 11 parameter, S 21 parameter, Z 11 Parameter or Z 21 Any of the parameters. S 11 The parameter is the reflection coefficient, which represents the return loss; S 21 The parameter is the transmission coefficient, which represents the insertion loss. Z 11 Parameter or Z21 The parameter is the impedance parameter, Z 11 It also represents the control effect of input current on input voltage, i.e. input impedance; ‌Z 21 Indicates the control effect of input current on output voltage.

[0094] S130 , inputting the port network parameters into the trained second generation model to determine the structural parameters of the metal patch pattern.

[0095] It should be noted that the second generation model is a deep learning network model, including but not limited to a generative adversarial network, a variational autoencoder, an autoregressive model or a flow model. The second generation model needs to be trained before prediction. The input of the second generation model is the port network parameter, and the output of the second generation model is the structural parameter of the metal patch pattern. The training sample of the second generation model uses the known port network parameters and the corresponding structural parameters of the metal patch pattern.

[0096] S140, determining a honeycomb electromagnetic unit according to equivalent circuit parameters and structural parameters of the metal patch pattern.

[0097] Specifically, a multi-bit phase-coded honeycomb electromagnetic unit is generated according to a height parameter of the equivalent circuit and a shape parameter of the metal patch pattern.

[0098] In a specific embodiment, the ultra-wideband 4-bit phase coded cellular electromagnetic unit LC Take the equivalent circuit parameter inverse design method as an example. Figure 4 As shown, Figure 4 The conditional generative adversarial network shown in , consists of a generator and a discriminator, which generates data of a specific category by adding conditional information in the generation and discrimination process. The training process consists of two steps: first, the discriminator is trained to distinguish between real data and fake data generated by the generator, and second, the generator is trained to generate samples that can deceive the discriminator. The generator receives a random noise z , generate samples through this noise, record it as G ( z ). Input parameters of the discriminator x Represents the sample, output D ( x )represent x is the probability of a real sample, which is used to determine whether a sample is "real". The competition between the generator and the discriminator promotes the continuous evolution of the model, making the generated data gradually close to the real data distribution. The ultimate goal is to output a result probability of 0.5 for both real and fake samples, so that the discriminator cannot judge, and the generator can also achieve the ability to make the fake look real. See Table 1 for the training samples of the inverse design of equivalent circuit parameters.

[0099] Table 1

[0100]

[0101] According to formula (1), the equivalent circuit parameters in Table 1 are substituted into the reflection phase formula to quickly generate 84630 sets of reflection phase training sets for sample data training of the conditional generative adversarial network.

[0102] like Figure 4 As shown, Figure 4 The figure shows the reflection phase distribution diagram of the ideal 4-bit phase encoding unit of this embodiment. It is input into the trained equivalent circuit parameter reverse design generation model, that is, the conditional generative adversarial network generator, which can automatically generate 16 sets of equivalent circuits. L , C and l 2 parameters, as shown in Table 2.

[0103] Table 2

[0104]

[0105] Finally, the 16 sets of parameters in Table 2 are substituted into formula (1) to calculate the reflection phase for verification. The results are as follows: Figure 6 As shown, the phase gradient of the 4-bit phase encoding unit is basically consistent in the frequency range of 8~18GHz, achieving the expected design purpose.

[0106] In a specific embodiment, this embodiment describes a method for reverse designing the structural parameters of an ultra-wideband 4-bit phase-coded cellular electromagnetic unit as an example. Figure 7 As shown in Figure 1, a conditional generative adversarial network is used to achieve the reverse design of unit structure parameters. The training data set is a simulation of a unit structure without a contact substrate using a frequency domain solver. S 11 Parameters. Figure 2 As shown in (a), the honeycomb electromagnetic unit is along x - y Plane periodic arrangement, the incident electromagnetic field is along − z A plane wave propagating in the direction of Z min and Z max The ports are all configured as Floquet ports. The metal patch structure in the unit is centered on the honeycomb sidewall, such as Figure 8 As shown in (a), the corresponding equivalent circuit is as follows Figure 8 As shown in (b).

[0107] For Figure 8 The equivalent circuit shown in (b) is S 11The parameters are expressed as:

[0108] (4)

[0109] From formula (4), we can see that S 11 Parameters and height of metal patch pattern h The 16 groups generated above are LC Substitute the parameters into formula (4) to calculate its S 11 Parameters. Then S 11 The parameters are input into the trained generator in this embodiment, which can automatically generate 16 sets of structural parameters of metal patches. w , g , y , x and m , the height parameter of the metal patch h Directly from the equivalent circuit parameters l 2 OK, that is h = l 2, as shown in Table 3, which shows the metal patch structure parameters of each unit. The generated metal patch pattern is as follows Fig. 9 As shown, when m =0, the curve in the metal patch pattern is a straight line.

[0110] Finally, the 16 groups of parameters in Table 3 are verified by simulation software for reflection phase simulation. The incident electromagnetic field is along - z A plane wave propagating in the direction of Z min The port is configured as a Perfect Electric Conductor (PEC) boundary. Z max The port is configured as a Floquet port. The simulation results are as follows Fig.10 As shown in the figure, the reflection phase interval of the 4-bit phase encoding unit in the frequency range of 8~18GHz is close to 22.5°, and the reflection phase of the 16 units can be adjusted 360°, achieving the expected design purpose. x and y The reflection phase distribution of polarization is basically the same, which shows that the proposed unit structure exhibits dual polarization performance. Here, the 4-bit phase coding is represented by the coding bits 0000, 0001, 0010, ..., 1111 respectively. It is worth mentioning that since the medium is nearly lossless, the reflection of the 16 units is almost lossless. In addition, the other parameters in this embodiment are as follows: The honeycomb side length of the honeycomb electromagnetic unit is a =8mm, the section height is b=12 mm. The ultra-thin medium is aramid paper with a thickness of t =0.05mm, the dielectric constant is 1.6, the loss tangent is 0.032, the thickness of the metal pattern surface layer is 0.017mm, and the metal material is copper.

[0111] Table 3

[0112]

[0113] The implementation of the embodiment of the present invention includes the following beneficial effects: in this embodiment, equivalent circuit parameters are generated by the reflection phase and the first generation model, and the port network parameters are determined according to the equivalent circuit parameters, the structural parameters of the metal patch pattern are generated by the port network parameters and the second generation model, and finally the cellular electromagnetic unit is determined according to the equivalent circuit parameters and the structural parameters of the metal patch pattern, and the first generation model and the second generation model are used jointly to quickly and accurately determine the cellular electromagnetic unit.

[0114] See also Fig.11 , an embodiment of the present invention provides a method for determining a honeycomb electromagnetic structure, comprising:

[0115] S210, determining an initial array arrangement of honeycomb electromagnetic units in the honeycomb electromagnetic structure;

[0116] S220 , updating the initial array arrangement of the honeycomb electromagnetic units according to a preset algorithm and a preset objective function until the preset requirements are met, and determining the honeycomb electromagnetic structure.

[0117] Specifically, first, the initial array arrangement of the honeycomb electromagnetic units in the honeycomb electromagnetic structure is determined by a random or gradient arrangement method; then, the initial array arrangement of the honeycomb electromagnetic units is updated according to a preset algorithm and a preset objective function until the preset requirements are met, and the honeycomb electromagnetic structure is determined. The preset algorithm is determined according to the actual application, and this embodiment does not make specific restrictions. For example, the preset algorithm includes but is not limited to a genetic algorithm, a simulated annealing algorithm, or a distribution estimation algorithm. The preset requirements are determined according to the actual application, and this embodiment does not make specific restrictions. For example, the preset requirements are to reach a preset number of cycles or a preset prediction accuracy.

[0118] In a specific embodiment, a polygonal heterogeneous array formed by compactly arranging multi-bit phase-coded cellular electromagnetic units proposes a more accurate pattern function as an objective function:

[0119] (5)

[0120] in, D m =3 1 / 2 ( a – t / 2)[2m +( n –1)mod2] / 2, D n =1.5( a – t / 2) n , represents the phase coefficient, k 0 is the free space wave number, θ and φ represents the azimuth in polar coordinates, M is the number of longitudinal honeycomb electromagnetic units, N is the number of transverse honeycomb electromagnetic units.

[0121] In a specific embodiment, according to the above embodiment Fig.10 The results shown indicate that a 4-bit ultra-wideband phase-coded cellular electromagnetic unit with a phase gradient of 22.5° has been obtained. According to the generalized Snell's law, a periodic array of an abnormal reflection cellular electromagnetic structure can be designed by arranging multi-bit phase-coded cellular electromagnetic units in a format with a specific phase gradient. In order to better demonstrate the electromagnetic scattering control performance of the invented phase-coded cellular electromagnetic structure, the units 0001, 0101, 1001 and 1101 in the above-mentioned embodiment are arranged in a single-row strip-type periodic arrangement according to the coding bits 0001-0101-1001-1101…0001-0101-1001-1101 to achieve an abnormal beam deflection and reflection effect. In this embodiment, a periodic array of a honeycomb electromagnetic structure with 22×25 regular hexagonal honeycomb units is formed, as shown in FIG. Fig.12 shown.

[0122] In order to verify the beamforming performance of the generated multi-bit phase-coded honeycomb electromagnetic structure periodic array, plane wave excitation under open boundaries was used and full-wave simulation was performed using a time domain solver. Fig.13 The simulation results of the array are shown here. For simplicity and generality, only y Polarization simulation results. The electromagnetic wave is vertically incident on the honeycomb electromagnetic structure periodic array. The figure shows the scattering fields corresponding to different operating frequencies from 9 GHz to 17 GHz. Compared with the scattering field of PEC, the honeycomb electromagnetic structure periodic array achieves the effect of abnormal beam deflection and reflection within the operating frequency band.

[0123] In a specific embodiment, this example combines a genetic algorithm, selects an array of 100 randomly ordered 4-bit phase-coded 0000, 0001, 0010, ..., 1111 units in the above embodiment as the initial population of the genetic algorithm, and uses the polygonal heterogeneous array antenna pattern as the objective function, with a crossover probability of 90% and a mutation probability of 10%. MThe value is 22, the number of transverse honeycomb electromagnetic units N The value is 25. Finally, the optimal array is calculated by iterating 1000 times, and the optimized cellular electromagnetic unit array of 4-bit phase encoding units is generated, as shown in Fig.14 The array consists of 22×25 units and has a size of approximately 300mm×300mm×12mm.

[0124] To verify the RCS reduction performance of the generated phase-coded honeycomb electromagnetic structure, plane wave excitation under open boundaries was used. Full-wave simulation was performed using a time domain solver. The simulation results are shown in Figure 2. Fig.15 As shown in the figure, the simulation effect of the scattered far field of metal and 4-bit phase-coded honeycomb electromagnetic structure is shown. For simplicity and without loss of generality, only y Polarization simulation results. Fig.15 In the figure, the scattered fields correspond to different operating frequencies from 9 GHz to 17 GHz. It can be observed that the scattered far field of the honeycomb electromagnetic structure is significantly reduced compared with the PEC, and diffusely scattered in all directions.

[0125] The single-station RCS simulation of the 4-bit phase-coded cellular electromagnetic structure of this embodiment is as follows: Fig.16 As shown. Obviously, the obtained random scattering far field exceeds the RCS reduction of 15dBsm compared with the RCS of the perfect PEC reflector in the 9.0GHz to 17.0GHz frequency band. The simulation results show that the desired RCS reduction is achieved within an ultra-wideband working bandwidth, proving the correctness and reliability of the present invention.

[0126] The implementation of the embodiment of the present invention includes the following beneficial effects: In this embodiment, the initial array arrangement of the honeycomb electromagnetic units in the honeycomb electromagnetic structure is first determined, and then the initial array arrangement of the honeycomb electromagnetic units is updated through a preset algorithm and a preset objective function, thereby optimizing the arrangement of the honeycomb electromagnetic structure and further reducing the radar scattering cross section.

[0127] like Fig.17 As shown, an embodiment of the present invention provides a system for determining a cellular electromagnetic unit, including:

[0128] The first module is used to determine the reflection phase of the bit phase encoding according to the profile height of the honeycomb electromagnetic unit;

[0129] The second module is used to input the reflection phase into the trained first generation model to determine the equivalent circuit parameters, and determine the port network parameters according to the equivalent circuit parameters;

[0130] The third module is used to input the port network parameters into the trained second generation model to determine the structural parameters of the metal patch pattern;

[0131] The fourth module is used to determine the honeycomb electromagnetic unit according to the equivalent circuit parameters and the structural parameters of the metal patch pattern.

[0132] It can be seen that the contents of the above-mentioned cellular electromagnetic unit determination method embodiment are all applicable to the cellular electromagnetic unit determination system embodiment, and the functions specifically implemented by the cellular electromagnetic unit determination system embodiment are the same as those of the above-mentioned cellular electromagnetic unit determination method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned cellular electromagnetic unit determination method embodiment.

[0133] like Fig.18 As shown, an embodiment of the present invention provides a system for determining a honeycomb electromagnetic structure, including:

[0134] The fifth module is used to determine the initial array arrangement of the honeycomb electromagnetic units in the honeycomb electromagnetic structure;

[0135] The sixth module is used to update the initial array arrangement of the honeycomb electromagnetic units according to a preset algorithm and a preset objective function until the preset requirements are met, thereby determining the honeycomb electromagnetic structure.

[0136] It can be seen that the contents of the above-mentioned honeycomb electromagnetic structure determination method embodiment are all applicable to the honeycomb electromagnetic structure determination system embodiment of the present invention, and the functions specifically implemented by the honeycomb electromagnetic structure determination system embodiment of the present invention are the same as those of the above-mentioned honeycomb electromagnetic structure determination method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned honeycomb electromagnetic structure determination method embodiment.

[0137] like Fig.19 As shown, an embodiment of the present invention provides a device for determining a cellular electromagnetic unit, comprising:

[0138] at least one processor;

[0139] at least one memory for storing at least one program;

[0140] When at least one program is executed by at least one processor, the at least one processor implements the above-mentioned method for determining the cellular electromagnetic unit.

[0141] It can be seen that the contents of the above-mentioned cellular electromagnetic unit determination method embodiment are all applicable to the cellular electromagnetic unit determination device embodiment, and the functions specifically implemented by the cellular electromagnetic unit determination device embodiment are the same as those of the above-mentioned cellular electromagnetic unit determination method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned cellular electromagnetic unit determination method embodiment.

[0142] An embodiment of the present invention provides a device for determining a honeycomb electromagnetic structure, including:

[0143] at least one processor;

[0144] at least one memory for storing at least one program;

[0145] When at least one program is executed by at least one processor, the at least one processor implements the above-mentioned method for determining the cellular electromagnetic structure.

[0146] It can be seen that the contents of the above-mentioned honeycomb electromagnetic structure determination method embodiment are all applicable to the honeycomb electromagnetic structure determination device embodiment of the present invention, and the functions specifically implemented by the honeycomb electromagnetic structure determination device embodiment of the present invention are the same as those of the above-mentioned honeycomb electromagnetic structure determination method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned honeycomb electromagnetic structure determination method embodiment.

[0147] On the other hand, an embodiment of the present invention provides a computer-readable storage medium storing a program executable by a processor, which is used to execute the above-mentioned method for determining a cellular electromagnetic unit or a method for determining a cellular electromagnetic structure when executed by the processor.

[0148] Among them, the memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. The memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a remote memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0149] In addition, the embodiment of the present application also discloses a computer program product or a computer program, and the computer program product or the computer program is stored in a computer-readable storage medium. The processor of the computer device can read the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device performs the above method. Similarly, the contents in the above method embodiment are all applicable to the storage medium embodiment, and the functions specifically implemented by the storage medium embodiment are the same as those in the above method embodiment, and the beneficial effects achieved are also the same as those achieved by the above method embodiment.

[0150] An embodiment of the present invention further provides a computer-readable storage medium, which stores a program executable by a processor. The program executable by the processor is used to implement the above method when executed by the processor.

[0151] It is understood that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0152] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic structure, characterized in that: A honeycomb electromagnetic structure realizes radar cross section reduction, the honeycomb electromagnetic structure includes a substrate and a plurality of honeycomb electromagnetic units arranged on the substrate, the honeycomb electromagnetic unit includes a honeycomb lattice structure, a plurality of adjacent side walls of the honeycomb lattice structure are provided with an electromagnetic resonance response structure, the honeycomb electromagnetic units are arranged in an array form, and the reflection phase of the honeycomb electromagnetic unit corresponds to a coding bit of a multi-bit phase encoding, including: Determining an initial array arrangement of honeycomb electromagnetic units in the honeycomb electromagnetic structure; The initial array arrangement of the honeycomb electromagnetic units is updated according to a preset algorithm and a preset objective function until the preset requirements are met, and the honeycomb electromagnetic structure is determined; the preset objective function includes the following formula: D m =3 1 / 2 ( a – t / 2)[2 m +( n –1)mod2] / 2, D n =1.5( a – t / 2) n , represents the phase coefficient, k 0 is the free space wave number, θ and represents the azimuth in polar coordinates, M is the number of longitudinal honeycomb electromagnetic units, N is the number of transverse honeycomb electromagnetic units, a is the honeycomb side length of the honeycomb electromagnetic unit, t is the thickness of the dielectric material of the honeycomb electromagnetic structure.

2. The determination method according to claim 1, characterized in that: The dielectric material of the honeycomb electromagnetic structure includes a lightweight material, and the lightweight material includes aramid paper or polyimide.

3. The determination method according to claim 1, characterized in that: The thickness of the dielectric material of the honeycomb electromagnetic structure is in the range of 0.05-0.07 mm.

4. The determination method according to claim 1, characterized in that: The flatness of the substrate is within a preset range, and the material of the substrate includes metal.

5. The determination method according to claim 1, characterized in that: The electromagnetic resonance response structure includes a preset metal patch pattern, the shape of the preset metal patch pattern includes an H shape, the structural parameters of the preset metal patch pattern are determined according to the reflection phase, and the honeycomb electromagnetic unit is determined by the following method: Determining the reflected phase of the bit phase encoding according to the profile height of the honeycomb electromagnetic unit; Input the reflection phase into the trained first generation model to determine equivalent circuit parameters, and determine port network parameters according to the equivalent circuit parameters; Inputting the port network parameters into the trained second generation model to determine the structural parameters of the metal patch pattern; A honeycomb electromagnetic unit is determined according to the equivalent circuit parameters and the structural parameters of the metal patch pattern.

6. The determination method according to claim 5, characterized in that: The port network parameters include S 11 parameter, S 21 parameter, Z 11 Parameter or Z 21 Any of the parameters.

7. The determination method according to claim 5, characterized in that: The midpoint of the preset metal patch pattern is located on the center line in the vertical direction of the side wall.

8. The determination method according to claim 5, characterized in that: The inner side wall or the outer side wall of the honeycomb electromagnetic unit is provided with a preset metal patch pattern.

9. The determination method according to claim 5, characterized in that: The middle connecting line of the H-shaped preset metal patch pattern includes a straight line or a curved line.

10. A device for determining an ultra-wideband multi-bit phase-coded cellular electromagnetic structure, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method according to any one of claims 1 to 9.

11. A computer-readable storage medium storing a program executable by a processor, characterized in that: The processor-executable program is used to perform the method according to any one of claims 1 to 9 when executed by the processor.

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