Method, device, equipment and medium for generating linear modulated wavefront electromagnetic waves

Abstract

The present invention relates to a method, device, equipment and medium for generating linear modulated wavefront electromagnetic waves. The method belongs to the field of signal processing technology, and includes: determining an array antenna configuration; then calculating the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field; constructing a desired radiation field pattern function based on the phase change rate and the phase change direction; calculating the excitation signal amplitude by Fourier synthesis based on the desired radiation field pattern function; and loading the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave. The present invention can generate a linear modulated wavefront electromagnetic wave whose wavefront phase varies with spatial position and whose beam energy is concentrated, thereby improving the imaging quality of wavefront modulation imaging in long-distance low signal-to-noise ratio scenarios and improving the imaging capability of wavefront modulation imaging in long-distance low signal-to-noise ratio scenarios.

Description

Technical Field

[0001] The present invention relates to the field of signal processing technology, and in particular to a method, device, equipment and medium for generating a linear modulated wavefront electromagnetic wave. Background Art

[0002] Forward-looking radar imaging has important and urgent application needs in many fields, such as autonomous driving, unmanned vehicles, and autonomous aircraft landing. Wavefront modulation imaging, a key technology for forward-looking radar imaging, achieves intra-beam resolution by encoding and modulating the electromagnetic wavefront, breaking the "homogeneity" of electromagnetic radiation within the beam.

[0003] Existing wavefront modulation imaging methods mainly include microwave correlation imaging and electromagnetic vortex imaging. Microwave correlation imaging generates a random radiation field that is uncorrelated in time and space, and correlates the target echo with the reference signal to achieve target reconstruction. Electromagnetic vortex imaging modulates the orbital angular momentum of electromagnetic waves to make their wavefront phase present a spiral distribution. The difference in the wavefront phase in different directions makes it possible to distinguish forward-looking targets. However, the gain of microwave correlation imaging signal processing is lower than that of traditional methods; the radiation field of vortex electromagnetic waves has the problem of hollow dispersion in the beam, so the application of existing wavefront modulation imaging in long-distance and low signal-to-noise ratio still has certain problems. Summary of the Invention

[0004] Based on this, it is necessary to provide a method, device, equipment and medium for generating linear modulated wavefront electromagnetic waves to solve the problem of energy divergence when the radiation field wavefront changes rapidly in wavefront modulation imaging, so as to improve the imaging capability of wavefront modulation imaging at long distances and low signal-to-noise ratio.

[0005] A method for generating a linear modulated wavefront electromagnetic wave, the method comprising:

[0006] Determine the array antenna configuration;

[0007] Calculating the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field;

[0008] Constructing an expected radiation field pattern function according to the phase change rate and the phase change direction;

[0009] Calculating the excitation signal amplitude by Fourier synthesis method based on the desired radiation field pattern function;

[0010] The excitation signal amplitude is loaded into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0011] A linear modulated wavefront electromagnetic wave generating device, comprising:

[0012] A configuration determination module, used to determine the array antenna configuration;

[0013] A phase change calculation module, configured to calculate the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field;

[0014] An expected radiation field pattern function construction module, configured to construct an expected radiation field pattern function according to the phase change rate and the phase change direction;

[0015] An excitation signal amplitude calculation module, configured to calculate the excitation signal amplitude by Fourier synthesis method based on the desired radiation field pattern function;

[0016] The electromagnetic wave generating module is used to load the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0017] A computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the linear modulation wavefront electromagnetic wave generation method when executing the computer program.

[0018] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for generating a linear modulated wavefront electromagnetic wave.

[0019] The above-mentioned linear modulated wavefront electromagnetic wave generation method, device, equipment and medium first determine the array antenna configuration; then, based on the far-field radiation field, calculate the phase change rate and phase change direction of the array antenna configuration; construct the expected radiation field pattern function according to the phase change rate and phase change direction; based on the expected radiation field pattern function, calculate the excitation signal amplitude through the Fourier synthesis method; load the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0020] The present invention modulates the excitation signal amplitude of the array antenna by the Fourier synthesis method, and can generate a linearly modulated wavefront electromagnetic wave whose wavefront phase varies with the spatial position and the beam energy is concentrated, thereby improving the imaging quality of wavefront modulation imaging in long-distance and low signal-to-noise ratio scenarios and enhancing the imaging capability of wavefront modulation imaging in long-distance and low signal-to-noise ratio scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 1 is a flow chart of a method for generating a linear modulated wavefront electromagnetic wave according to an embodiment;

[0023] Figure 2 Schematic diagram of antenna configuration in one embodiment; wherein, Figure 2 (a) is a schematic diagram of a uniform linear array. Figure 2 (b) is a schematic diagram of a uniform array;

[0024] Figure 3 A schematic diagram of the excitation amplitude distribution in one embodiment; wherein, Figure 3 (a) is a schematic diagram of the uniform linear array excitation amplitude distribution. Figure 3 (b) is a schematic diagram of the uniform array excitation amplitude distribution;

[0025] Figure 4 is a diagram showing the electric field intensity distribution of the uniform linear array radiation field after amplitude modulation in one embodiment;

[0026] Figure 5 is a wavefront phase distribution diagram of a uniform radiation field after amplitude modulation in one embodiment;

[0027] Figure 6 1 is a diagram showing the electric field intensity distribution of a uniform array radiation field after amplitude modulation in one embodiment;

[0028] Figure 7 FIG1 is a wavefront phase distribution diagram of a uniform planar array radiation field after amplitude modulation in one embodiment;

[0029] Figure 8 is a structural block diagram of a linear modulation wavefront electromagnetic wave generating device in one embodiment;

[0030] Figure 9 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment.

[0031] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] As can be understood, existing wavefront modulation imaging primarily modulates electromagnetic waves along dimensions such as frequency and phase. Therefore, the present invention modulates electromagnetic waves along a new dimension: amplitude. By modulating the amplitude of the excitation signal for the antenna array, a linearly modulated wavefront electromagnetic wave is generated, with concentrated electric field energy and a wavefront phase that varies linearly with spatial position. This overcomes the difficulties of wavefront modulation imaging in applications with low signal-to-noise ratios at long distances.

[0034] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0035] In one embodiment, Figure 1 As shown, a method for generating a linear modulated wavefront electromagnetic wave is provided, comprising the following steps:

[0036] Step 101: Determine the array antenna configuration.

[0037] It is understandable that the configuration of the array antenna is first designed according to the requirements of the imaging scenario. For example, for two-dimensional imaging in range and azimuth, the phase change direction of the linearly modulated wavefront electromagnetic wave is fixed, and a one-dimensional uniform linear array can be used to generate it. For three-dimensional imaging in range and azimuth, the phase change direction of the linearly modulated wavefront electromagnetic wave changes multiple times, and a two-dimensional uniform planar array is required to generate it. It is worth noting that when configuring the array antenna, there is no limit to the form of the array element; monopoles, dipoles, horn antennas, etc. can all be used without loss of generality. The array elements in this embodiment use ideal point sources.

[0038] When the array elements use ideal point sources, the center positions of the uniform linear array and uniform planar array are both located at the origin, and the interval between adjacent array elements is d = λ / 2, where λ is the wavelength of the array antenna excitation signal, and the uniform planar array is squarely distributed. The schematic diagrams of the uniform linear array and uniform planar array are shown as follows: Figure 2 (a) and Figure 2 (b) shown.

[0039] Step 102: Calculate the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field.

[0040] It can be understood that after determining the basic configuration of the antenna array, the phase change rate of the array antenna at different scanning angles is calculated to achieve the required beam scanning and directivity; and the phase change direction is determined to form the required beam pattern.

[0041] Step 103: constructing an expected radiation field pattern function according to the phase change rate and the phase change direction.

[0042] It can be understood that the expected radiation field pattern function is generally used to describe the radiation intensity distribution of an antenna or array antenna in different directions, so as to meet specific communication or radar application requirements.

[0043] Step 104 : Calculate the excitation signal amplitude by Fourier synthesis method based on the expected radiation field pattern function.

[0044] It can be understood that the radiation pattern of an array antenna and the antenna excitation current function are related by Fourier transform. Therefore, the excitation amplitude of the array antenna can be regarded as the sampled value of the antenna excitation current function. Therefore, by equating the array element excitation and the coefficients of the Fourier series, the excitation signal amplitude of each array element can be calculated.

[0045] Step 105: Load the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0046] It can be understood that in this step, by maintaining constant parameters such as the initial phase and frequency of the array element excitation, the calculated signal amplitude can be used to generate a linearly modulated electromagnetic wave with a corresponding wavefront phase change rate and direction. Applying the excitation signal amplitude to the corresponding array antenna configuration generates a linearly modulated electromagnetic wave.

[0047] The above-mentioned method for generating linear modulated wavefront electromagnetic waves first determines the array antenna configuration; then, based on the far-field radiation field, calculates the phase change rate and phase change direction of the array antenna configuration; constructs the expected radiation field pattern function according to the phase change rate and phase change direction; based on the expected radiation field pattern function, calculates the excitation signal amplitude through the Fourier synthesis method; and loads the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0048] The present invention modulates the excitation signal amplitude of the array antenna by the Fourier synthesis method, and can generate a linearly modulated wavefront electromagnetic wave whose wavefront phase varies with the spatial position and the beam energy is concentrated, thereby improving the imaging quality of wavefront modulation imaging in long-distance and low signal-to-noise ratio scenarios and enhancing the imaging capability of wavefront modulation imaging in long-distance and low signal-to-noise ratio scenarios.

[0049] In one embodiment, for any linear modulated wavefront electromagnetic wave, when the pitch angle is small, the far-field radiation field expression is:

[0050]

[0051] Where (x, y, z) represents the position of point P in the target area; N represents the number of array elements; A n represents the excitation signal amplitude of the nth array element; (x n ,y n ,z n ) represents the position of the nth array element; k is the wave number of the electromagnetic wave; j represents the imaginary unit; and e represents the natural base. When the array configuration and the excitation signal amplitude are constant, the wavefront phase of the radiation field is related to the spatial position. Linear change.

[0052] In one embodiment, calculating the phase change rate and phase change direction of the array antenna configuration includes:

[0053] Obtain the number of array elements, the amplitude of the excitation signal of the array element, and the position of the array element.

[0054] The rate of change along the x-axis and the rate of change along the y-axis are calculated according to the number of array elements, the amplitude of the excitation signal of the array element, and the position of the array element.

[0055] The phase change rate and phase change direction of the array antenna configuration are calculated according to the change rate along the x-axis direction and the change rate along the y-axis direction.

[0056] In one embodiment, the phase change rate expression is:

[0057]

[0058] in:

[0059]

[0060] Where K x Indicates the rate of change of the wavefront phase along the x-axis; K y It represents the rate of change of the wavefront phase along the y-axis.

[0061] In one embodiment, the phase change direction expression is:

[0062]

[0063] Where K x Indicates the rate of change along the x-axis; K y Indicates the rate of change along the y-axis.

[0064] It can be understood that the phase change rate K is the phase change rate with the largest wavefront phase; the azimuth angle with the fastest wavefront phase change is the phase change direction

[0065] Specifically, when a uniform linear array is used to generate a linear modulated wavefront electromagnetic wave with a wavefront phase change rate of K, the array can be arranged along the x-axis. In this case, K x =K,K y =0, the phase change direction is

[0066] When a uniform array is used to generate a wavefront phase change rate of K, the phase change direction is The linear modulated wavefront electromagnetic wave, at this time

[0067] In one embodiment, constructing a desired radiation field pattern function based on the phase change rate and the phase change direction includes:

[0068] When the array antenna is configured as a uniform linear array, the expected radiation pattern function expression is:

[0069]

[0070] At this time, the expected radiation pattern function of the uniform linear array means: at the set main lobe width θ d The intensity of the radiation field is the same, but the wavefront phase of the radiation field changes linearly along the x-axis.

[0071] When the array antenna is configured as a uniform array, the expected radiation pattern function expression is:

[0072]

[0073] Where u represents the x-coordinate of the radiation field and the distance The ratio of v represents the y coordinate and distance of the radiation field The ratio of θ xd represents the expected main lobe width of the radiation field in the x-plane, θ yd K represents the expected main lobe width of the radiation field in the y plane; x Indicates the rate of change along the x-axis; K y Indicates the rate of change along the y-axis; K indicates the rate of change of phase. At this time, the expected radiation pattern function of the uniform array means that within the main lobe width set in the x and y directions, the intensity of the radiation field is the same, and the wavefront phase is along The direction changes linearly with a rate of change K.

[0074] It can be understood that for the required linear modulated wavefront electromagnetic wave, the expected radiation field has uniform energy distribution in the main lobe and the wavefront phase changes linearly. Based on this, the expected radiation field pattern function for a uniform linear array and the expected radiation field pattern function for a uniform planar array are constructed.

[0075] In one embodiment, the excitation signal amplitude is calculated by Fourier synthesis method based on the desired radiation field pattern function, including:

[0076] When the array antenna configuration is a uniform linear array, the excitation signal amplitude expression of the array element in the array antenna configuration is:

[0077]

[0078] When the array antenna configuration is a uniform array, the excitation signal amplitude expression of the array element in the array antenna configuration is:

[0079] A m,n =A xm ·A yn ;

[0080] in:

[0081]

[0082] Where A n represents the excitation signal amplitude of the nth array element; d represents the array element spacing; λ represents the array element excitation signal wavelength; A xm A represents the excitation amplitude of the mth element of the x-axis uniform linear array; yn Indicates the excitation amplitude of the nth element of the y-axis uniform linear array.

[0083] It can be understood that for a uniform array, since its expected radiation field pattern function is a two-dimensional function, the direct Fourier solution is computationally intensive. Based on this, the expected radiation field pattern function of the uniform array is decomposed into the product of two patterns, namely

[0084]

[0085] At this time, the radiation field of the uniform linear array can be regarded as the product of the expected radiation field pattern functions of the two uniform linear arrays on the x-axis and y-axis. According to the properties of Fourier transform, the excitation amplitude of the uniform plane array can be obtained by convolution of the excitation amplitudes of the two uniform linear arrays. Therefore, first solve the excitation amplitude A of the uniform linear array on the x-axis xm and the excitation amplitude A of the uniform linear array on the y-axis yn ; Then according to A xm and A yn Determine the amplitude of the excitation signal for the elements of a uniform array.

[0086] Specifically, for a uniform linear array on the x-axis, assume that the total number of array elements is 40, the excitation signal frequency is 10 GHz, and the element spacing is d = λ / 2. Assume that the main lobe width of the desired radiation pattern function is π / 15, and the wavefront phase change rate K = 20. The linear array excitation amplitude distribution obtained by the Fourier synthesis method is as follows: Figure 3 As shown in (a).

[0087] For a uniform array on the x-axis, assume that the total number of array elements is 160, the excitation signal frequency is 10 GHz, and the element spacing is d = λ / 2. Assume that the main lobe width of the desired radiation pattern function in the x and y planes is π / 15, and the wavefront phase change rate is The phase change direction is The uniform array excitation amplitude distribution obtained by Fourier synthesis method is shown in the figure below: Figure 3 (b) shown.

[0088] After calculating the excitation signal amplitude through the Fourier synthesis method, the excitation signal amplitude is loaded into the array antenna configuration to obtain a linearly modulated wavefront electromagnetic wave.

[0089] Specifically, the observation window is perpendicular to the z-axis, the distance between the observation window and the linear array is z = 1000λ, and the width in the x and y directions is 300λ. The array element excitation signal is consistent with the fourth step. The electric field intensity and wavefront phase of the x-axis uniform linear array radiation field after amplitude modulation are respectively as follows: Figure 4 and Figure 5 Similarly, the electric field intensity and wavefront phase of the uniform array radiation field after amplitude modulation are respectively as follows: Figure 6 and Figure 7 As shown in the figure, the linearly modulated wavefront electromagnetic wave has concentrated energy and a linearly gradient phase. The proposed design method can generate corresponding linearly modulated wavefront electromagnetic waves according to imaging requirements. Furthermore, the proposed method improves the energy divergence problem of existing wavefront modulation radiation fields when the wavefront changes rapidly.

[0090] To sum up, the linear modulated wavefront electromagnetic wave generation method proposed in the present invention has an array that does not limit the type of array elements and can better generate the required radiation field, thereby generating a linear modulated wavefront electromagnetic wave whose wavefront phase changes with the spatial position and the beam energy is concentrated, thereby improving the imaging quality of wavefront modulation imaging in long-distance and low signal-to-noise ratio scenarios, and is conducive to improving the imaging capability of wavefront modulation imaging in long-distance and low signal-to-noise ratio conditions.

[0091] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0092] In one embodiment, Figure 8 As shown, a linear modulated wavefront electromagnetic wave generating device is provided, comprising: a configuration determining module 201, a phase change calculating module 202, a desired radiation field pattern function constructing module 203, an excitation signal amplitude calculating module 204, and an electromagnetic wave generating module 205, wherein:

[0093] The configuration determination module 201 is used to determine the array antenna configuration.

[0094] The phase change calculation module 202 is used to calculate the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field.

[0095] The expected radiation field pattern function construction module 203 is used to construct an expected radiation field pattern function according to the phase change rate and the phase change direction.

[0096] The excitation signal amplitude calculation module 204 is used to calculate the excitation signal amplitude by Fourier synthesis method based on the expected radiation field pattern function.

[0097] The electromagnetic wave generating module 205 is used to load the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0098] For the specific definition of the linear modulation wavefront electromagnetic wave generating device, please refer to the definition of the linear modulation wavefront electromagnetic wave generating method above, and will not be repeated here. The various modules in the above-mentioned linear modulation wavefront electromagnetic wave generating device can be implemented in whole or in part by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0099] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 9 As shown. The computer device includes a processor, a memory, a network interface and a database connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store linear modulated wavefront electromagnetic wave generation data. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for generating a linear modulated wavefront electromagnetic wave is implemented.

[0100] Those skilled in the art will understand that Figure 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0101] 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:

[0102] Step 101: Determine the array antenna configuration.

[0103] Step 102: Calculate the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field.

[0104] Step 103: constructing an expected radiation field pattern function according to the phase change rate and the phase change direction.

[0105] Step 104 : Calculate the excitation signal amplitude by Fourier synthesis method based on the expected radiation field pattern function.

[0106] Step 105: Load the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0107] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0108] Step 101: Determine the array antenna configuration.

[0109] Step 102: Calculate the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field.

[0110] Step 103: constructing an expected radiation field pattern function according to the phase change rate and the phase change direction.

[0111] Step 104 : Calculate the excitation signal amplitude by Fourier synthesis method based on the expected radiation field pattern function.

[0112] Step 105: Load the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

[0113] Those skilled in the art will appreciate that all or part of the processes in the above-described embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the above-described embodiments. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct RAM bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM).

[0114] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for generating a linear modulated wavefront electromagnetic wave, characterized in that: The method comprises: Determine the array antenna configuration; Calculating the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field; Constructing an expected radiation field pattern function according to the phase change rate and the phase change direction; Calculating the excitation signal amplitude by Fourier synthesis method based on the desired radiation field pattern function; Loading the excitation signal amplitude to the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave; Wherein, based on the Fourier transform relationship between the radiation pattern of the array antenna and the antenna excitation current function, the excitation amplitude of the array antenna is regarded as a sample value of the antenna excitation current function; The excitation signal amplitude of each array element is obtained by making the array element excitation and the coefficient of the Fourier series equal.

2. The method for generating a linear modulated wavefront electromagnetic wave according to claim 1, wherein: The far-field radiation field expression is: ； in, Indicates the target area The location of the point; Indicates the number of array elements; Indicates the The excitation signal amplitude of each array element; Indicates the The position of each array element; is the electromagnetic wave number; represents an imaginary unit; Represents the natural base.

3. The method for generating a linear modulated wavefront electromagnetic wave according to claim 2, wherein: Calculating the phase change rate and phase change direction of the array antenna configuration includes: Obtaining the number of array elements, the amplitude of the excitation signal of the array element, and the position of the array element; The edge is calculated according to the number of array elements, the amplitude of the excitation signal of the array element, and the position of the array element. The rate of change along the axis and along The rate of change in the axial direction; According to the The rate of change in the axial direction, along The phase change rate and phase change direction of the array antenna configuration are calculated based on the rate of change in the axial direction.

4. The method for generating a linear modulated wavefront electromagnetic wave according to claim 3, wherein: The phase change rate expression is: ； in: ； ； Where, Indicates the wavefront phase edge The rate of change in the axial direction; Indicates the wavefront phase edge The rate of change in the axial direction.

5. The method for generating a linear modulated wavefront electromagnetic wave according to claim 3, wherein: The phase change direction expression is: ； Where, Indicates the wavefront phase edge The rate of change in the axial direction; Indicates the wavefront phase edge The rate of change in the axial direction.

6. The method for generating a linear modulated wavefront electromagnetic wave according to claim 3, wherein: Constructing an expected radiation field pattern function according to the phase change rate and the phase change direction, including: When the array antenna configuration is a uniform linear array, the expected radiation field pattern function expression is: ； When the array antenna configuration is a uniform array, the expected radiation field pattern function expression is: ； Where, Represents the radiation field Coordinates and distances The ratio of Represents the radiation field Coordinates and distances The ratio of Indicates that the radiation field is The desired main lobe width in the plane, Indicates that the radiation field is The desired main lobe width in the plane; Indicates the wavefront phase edge The rate of change in the axial direction; Indicates the wavefront phase edge The rate of change in the axial direction; Indicates the rate of change of phase.

7. The method for generating a linear modulated wavefront electromagnetic wave according to claim 6, wherein: Based on the desired radiation field pattern function, the excitation signal amplitude is calculated by Fourier synthesis method, including: When the array antenna configuration is a uniform linear array, the excitation signal amplitude expression of the array element in the array antenna configuration is: ； When the array antenna configuration is a uniform array, the excitation signal amplitude expression of the array element in the array antenna configuration is: ； in: ； ； Where, Indicates the The excitation signal amplitude of each array element; represents the array element spacing; Indicates the wavelength of the array element excitation signal; express Axis Uniform Linear Array The excitation amplitude of each array element; express Axis Uniform Linear Array The excitation amplitude of each array element.

8. A linear modulated wavefront electromagnetic wave generating device, characterized in that: The device comprises: A configuration determination module, used to determine the array antenna configuration; A phase change calculation module, configured to calculate the phase change rate and phase change direction of the array antenna configuration based on the far-field radiation field; An expected radiation field pattern function construction module, configured to construct an expected radiation field pattern function according to the phase change rate and the phase change direction; An excitation signal amplitude calculation module, configured to calculate the excitation signal amplitude by Fourier synthesis method based on the desired radiation field pattern function; The electromagnetic wave generating module is used to load the excitation signal amplitude into the array antenna configuration to obtain a linear modulated wavefront electromagnetic wave.

9. 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 for generating a linear modulated wavefront electromagnetic wave according to any one of claims 1 to 7 are implemented.

10. 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 for generating a linear modulated wavefront electromagnetic wave according to any one of claims 1 to 7 are implemented.

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