A 3D microwave near-field imaging method, device, system and medium thereof

Abstract

The application belongs to the technical field of microwave imaging, and relates to a 3D microwave near-field imaging method, device, system and medium thereof, comprising the following steps: dividing the entire antenna array topology structure into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks; according to the divided first sub-blocks, second sub-blocks, third sub-blocks and fourth sub-blocks, taking the midpoint of each group of transceiving antenna phase centers on each sub-block as the equivalent phase center of a virtual antenna, respectively determining the virtual antenna array element arrangement on the first sub-blocks, second sub-blocks, third sub-blocks and fourth sub-blocks; according to the virtual antenna array element arrangement, compensating the transceiving data phase of the antenna array topology structure pre-acquired for the target transceiving data of the virtual antenna; and according to the target transceiving data of the virtual antenna, adopting a wave number domain algorithm and a BP algorithm for imaging. The advantage lies in that under the condition of reducing the use of transceiving antennas, the resolution and definition of the generated image are ensured not to be reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of microwave imaging technology, and relates to a 3D microwave near-field imaging method, device, system and medium thereof. BACKGROUND

[0002] The microwave imaging technology is based on the research on the propagation and scattering of microwaves in various complex media, and reconstructs the complex permittivity image inside the measured medium by measuring the scattering field data outside the measured medium. The measured scattering field carries a large amount of information about the scattering body, and some characteristics of the scattering body itself, such as the shape of the scattering body and the distribution of the permittivity, can be extracted by using the prior knowledge about the scattering target and through appropriate mathematical processing. Since the microwave imaging can realize non-destructive detection of the target, the target can be geometrically and physically imaged at the same time.

[0003] Reference to the accompanying drawings Figure 6 In the prior art, the antenna arrays of the antenna array structure are connected in sequence, and there is no spacing between the adjacent two antenna arrays. Therefore, under the condition that the size of the antenna array structure is constant, more antenna arrays are laid out, and correspondingly, more transceiving antennas are used. When the antenna array of this type generates imaging, the back projection algorithm or the wave number domain method is generally used to generate imaging. Although the back projection algorithm generates images with high quality, the calculation speed is not fast enough. Although the wave number domain method generates images with high calculation speed, the resolution of the near-field imaging is related to the imaging distance. The resolution of the imaging generated by the wave number domain algorithm at the near-field 0.6m is completely insufficient, so that the generated imaging cannot be used. SUMMARY

[0004] The purpose of the present application is to provide a 3D microwave near-field imaging method, device, system and medium thereof, which can reduce the use of transceiving antennas and ensure that the resolution and clarity of the generated image will not be reduced.

[0005] In order to achieve the above purpose, the following technical solutions are adopted in the present application:

[0006] The first aspect of the present application provides a 3D near-field microwave imaging method, comprising the following steps:

[0007] The entire antenna array topology structure is divided into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array;

[0008] According to the first sub-block, the second sub-block, the third sub-block and the fourth sub-block, the midpoint of each group of transceiving antenna phase centers on each sub-block is taken as the equivalent phase center of a virtual antenna, and the virtual antenna array element arrangement on the first sub-block, the second sub-block, the third sub-block and the fourth sub-block is determined respectively;

[0009] According to the virtual antenna array element arrangement, the transceiving data phase compensation of the antenna array topology structure pre-acquired is compensated as the target transceiving data of the virtual antenna, and the target transceiving data of the virtual antenna includes: the target transceiving data of the first sub-block, the target transceiving data of the second sub-block, the target transceiving data of the third sub-block and the target transceiving data of the fourth sub-block;

[0010] According to the target transceiving data of the virtual antenna, the wave number domain algorithm and the BP algorithm are used for imaging.

[0011] Further, according to the virtual antenna array element arrangement, the transceiving data phase compensation of the antenna array topology structure pre-acquired is compensated as the target transceiving data of the virtual antenna, and the target transceiving data of the virtual antenna includes: the target transceiving data of the first sub-block, the target transceiving data of the second sub-block, the target transceiving data of the third sub-block and the target transceiving data of the fourth sub-block, which includes:

[0012] The center coordinates of each sub-block are calculated and the coordinates of the virtual antenna , wherein, is the center coordinate of the sub-block n, is the coordinate of the distance direction of the antenna array, is the coordinate of the transmitting antenna, is the coordinate of the receiving antenna;

[0013] According to the center coordinates of each sub-block and the coordinates of the virtual antenna, the first distance between the transceiving antenna and the center of the imaging area of the sub-block and the second distance between the virtual antenna and the center of the imaging area of the sub-block are calculated respectively;

[0014] According to the first distance and the second distance, the difference between the first distance and the second distance is calculated , wherein, ;

[0015] According to the difference between the first distance and the second distance , the target transceiving data of the virtual antenna is determined , wherein, .

[0016] Further, the conversion module comprises:

[0017] The second aspect of the application provides a 3D near-field microwave imaging device, which comprises:

[0018] The dividing module is configured to divide the whole antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed region surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is a region between two adjacent transmitting antenna arrays, the third sub-block is a region between two adjacent receiving antenna arrays, and the fourth sub-block is a region surrounded by no antenna array.

[0019] The determining module is configured to determine the virtual antenna element arrangement on each sub-block according to the midpoint of the phase center of each group of transceiving antennas on each sub-block as the equivalent phase center of the virtual antenna.

[0020] The conversion module is configured to convert the transceiving data phase compensation of the antenna array topology pre-acquired according to the virtual antenna element arrangement into target transceiving data of the virtual antenna, wherein the target transceiving data of the virtual antenna comprises target transceiving data of the first sub-block, target transceiving data of the second sub-block, target transceiving data of the third sub-block and target transceiving data of the fourth sub-block.

[0021] The image generation module is configured to perform imaging by using a wave number domain algorithm and a BP algorithm according to the target transceiving data of the virtual antenna.

[0022] Further, the conversion module comprises:

[0023] The first sub-computing module is configured to calculate the center coordinates of each sub-block and the coordinates of the virtual antenna wherein, is the center of the sub-block n, is the coordinate of the distance direction of the antenna array, is the coordinate of the transmitting antenna, is the coordinate of the receiving antenna.

[0024] a second sub-computing module configured to calculate a first distance from a transceiving antenna to a center of an imaging area of each sub-block and a second distance from a virtual antenna to the center of the imaging area of the sub-block according to the center coordinates of each sub-block and the coordinates of the virtual antenna;

[0025] a third sub-computing module configured to calculate a difference between the first distance and the second distance according to the first distance and the second distance , wherein, ;

[0026] It should be noted that, is a distance from a transceiving antenna to a center of an imaging area, is a distance from a receiving antenna to the center of the imaging area, is a distance from a virtual antenna to the center of the imaging area;

[0027] a determining module configured to determine a target transceiving data of the virtual antenna according to the difference between the first distance and the second distance , wherein, ;

[0028] It should be noted that, represents a serial number of a transmitting element, represents a serial number of a receiving element, represents a distance from an imaging plane to an antenna plane, represents a transmitting antenna, a receiving antenna echo, is an index for phase compensation, is a complex symbol, is a spatial spectrum, and k = 2 * pi * f / c, f represents a transmitting signal frequency, and c represents a light speed.

[0029] A third aspect of the present application provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the 3D near-field microwave imaging method when executing the computer program.

[0030] A fourth aspect of the present application provides a storage medium, wherein the storage medium stores a computer program, and the computer program implements the steps of the 3D near-field microwave imaging method when executed by a processor.

[0031] The present application has the following beneficial effects:

[0032] ​By dividing the whole antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array; according to the divided first sub-block, the second sub-block, the third sub-block and the fourth sub-block, the equivalent phase centers of the virtual antennas are determined by taking the midpoint of each group of phase centers of the transceiving antennas on each sub-block as the equivalent phase center of the virtual antenna, and the virtual antenna element arraying on the first sub-block, the second sub-block, the third sub-block and the fourth sub-block is determined; according to the virtual antenna element arraying, the transceiving data phase compensation of the antenna array topology pre-acquired is compensated as the target transceiving data of the virtual antenna, and the target transceiving data of the virtual antenna includes the target transceiving data of the first sub-block, the target transceiving data of the second sub-block, the target transceiving data of the third sub-block and the target transceiving data of the fourth sub-block; according to the target transceiving data of the virtual antenna, the wave number domain algorithm and the BP algorithm are used for imaging; so that the virtual array surface can exactly meet the imaging requirements, and no redundant virtual array is generated, and therefore the resolution and the definition of the imaging can be ensured without reducing the use of transceiving antennas. BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 is a flowchart of a 3D microwave near-field imaging method in the present application; Figure 1 FIG. 2 is a schematic diagram of an antenna array topology in the present application;

[0034] FIG. 3 is a structure schematic diagram of a virtual antenna element arraying in the present application; Figure 2

[0035] FIG. 4 is a structure schematic diagram of a 3D microwave near-field imaging device in the present application; Figure 3 FIG. 5 is a structure schematic diagram of a computer device in the present application;

[0036] Figure 4 FIG. 6 is a schematic diagram of an existing antenna array structure.

[0037] FIG. 7 is a specific embodiment of the present application. Figure 5

[0038] FIG. 8 is a specific embodiment of the present application. Figure 6 DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0040] ​​​​In the description of the present application, it needs to be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0041] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0042] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] Since the antenna arrays of the existing microwave imaging antenna array structure are connected in sequence, and no spacing is provided between the two adjacent antenna arrays, under the condition that the size of the antenna array structure is constant, more antenna arrays will be laid out, and correspondingly, more transceiving antennas will be used. This type of antenna array generally uses back projection algorithm or wave number domain method to generate imaging when generating imaging. Although the back projection algorithm generates high-quality pictures, the calculation speed is not fast enough, and the wave number domain method generates imaging with high calculation speed, but the resolution of near-field imaging is related to the imaging distance. The imaging resolution generated by the wave number domain algorithm at a near-field distance of 0.6m is completely insufficient, resulting in that the generated imaging cannot be used.

[0044] Reference is made to the accompanying drawings Figure 1 -Appendix Figure 3 Therefore, the first aspect of the present application provides a 3D near-field microwave imaging method, comprising the following steps:

[0045] S100: divide the whole antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array.

[0046] It should be noted that the accompanying drawings Figure 2 In step S100, since there is a preset interval between the antenna array topologies, under the condition that the size of the antenna array structure is constant, the layout of the antenna array will be better, and accordingly, the transceiving antennas used will be less, so the use amount of the antennas will be naturally reduced. In the embodiment, the antenna array topology adopted is composed of 4*8 antenna arrays, each of which is composed of 16*16 horn antennas, the solid circle represents a horn transmitting antenna, the hollow circle represents a horn receiving antenna, the interval between the antennas is d=7.8mm, the transmitting frequency is 33GHz, and the bandwidth is 6GHz.

[0047] S200: according to the first sub-block, the second sub-block, the third sub-block and the fourth sub-block, taking the midpoint of the phase center of each group of transceiving antennas on each sub-block as the equivalent phase center of the virtual antenna, respectively determining the virtual antenna array element arrangement on the first sub-block, the second sub-block, the third sub-block and the fourth sub-block.

[0048] It should be noted that the accompanying drawings Figure 2 For example, in the accompanying drawings Figure 2 , the first sub-block is the A area in the accompanying drawings Figure 2 , the second sub-block is the B area in the accompanying drawings Figure 2 , the third sub-block is the C area in the accompanying drawings Figure 2 , and the fourth sub-block is the D area in the accompanying drawings Figure 2 , wherein in one first sub-block, the transmitting antennas T1 and T2 transmit signals, and the receiving antennas R1 and R2 receive, and the midpoint of the connecting line of the receiving antennas R1 and R2 fills the sub-block A; one second sub-block is composed of adjacent T3R1, T3R2, T2R3 and T2R4, one third sub-block is composed of adjacent T1R5, T5R2, T2R5 and T6R2, and one fourth sub-block is composed of DT2R7, T6R4, T3R5 and T7R2.

[0049] S300: according to the virtual antenna array element arrangement, compensating the transceiving data phase of the antenna array topology pre-acquired for the target transceiving data of the virtual antenna, wherein the target transceiving data of the virtual antenna includes the target transceiving data of the first sub-block, the target transceiving data of the second sub-block, the target transceiving data of the third sub-block and the target transceiving data of the fourth sub-block.

[0050] S400: imaging by using the wave number domain algorithm and the BP algorithm according to the target transceiving data of the virtual antenna.

[0051] Since the resolution and the clarity of imaging mainly depend on the array size and the array element interval, the technical solution divides the whole antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array; the equivalent phase centers of the virtual antenna are determined according to the midpoint of each group of phase centers of the transceiving antenna on each sub-block, the virtual antenna element arrangement on the first sub-block, the second sub-block, the third sub-block and the fourth sub-block is determined respectively, the transceiving data phase compensation of the antenna array topology pre-acquired is compensated to the target transceiving data of the virtual antenna according to the virtual antenna element arrangement, the target transceiving data of the virtual antenna includes the target transceiving data of the first sub-block, the target transceiving data of the second sub-block, the target transceiving data of the third sub-block and the target transceiving data of the fourth sub-block; imaging is performed by using the wave number domain algorithm and the BP algorithm according to the target transceiving data of the virtual antenna; the virtual array can exactly meet the imaging requirement without generating redundant virtual arrays, so that the resolution and the clarity of imaging can be ensured without being reduced under the condition of reducing the use of transceiving antennas.

[0052] In one embodiment, the transceiving data phase compensation of the antenna array topology pre-acquired is compensated to the target transceiving data of the virtual antenna according to the virtual antenna element arrangement, the target transceiving data of the virtual antenna includes the target transceiving data of the first sub-block, the target transceiving data of the second sub-block, the target transceiving data of the third sub-block and the target transceiving data of the fourth sub-block, which includes:

[0053] S310: calculating the center coordinates of each sub-block and the coordinates of the virtual antenna , wherein, is the center of the sub-block n, is the distance direction coordinate of the antenna array, is the coordinate of the transmitting antenna, is the coordinate of the receiving antenna;

[0054] S320: calculating the first distance from the transceiving antenna to the center of the imaging area of the sub-block and the second distance from the virtual antenna to the center of the imaging area of the sub-block according to the center coordinates of each sub-block and the coordinates of the virtual antenna, respectively;

[0055] S330: calculating a difference between the first distance and the second distance according to the first distance and the second distance , wherein, ;

[0056] It should be noted that, is a distance from a transmitting antenna to a center of an imaging area, is a distance from a receiving antenna to a center of imaging, is a distance from a virtual antenna to a center of imaging; since electromagnetic wave propagation is double, the difference between the first distance and the second distance needs to be calculated when .

[0057] S340: determining target transceiving data of a virtual antenna according to the difference between the first distance and the second distance , wherein, . .

[0058] It should be noted that, represents a serial number of a transmitting element, represents a serial number of a receiving element, represents a distance from an imaging plane to an antenna plane, represents a transmitting antenna, a receiving antenna echo, is an index for phase compensation, is a complex symbol, is a spatial spectrum, and k = 2 * pi * f / c, f represents a transmitting signal frequency, and c represents a light speed.

[0059] In one embodiment, the imaging according to the target transceiving data of the virtual antenna by using a wave number domain algorithm and a BP algorithm is: imaging the target transceiving data of the first sub-block, the target transceiving data of the second sub-block and the target transceiving data of the third sub-block by using the wave number domain algorithm, and imaging the target transceiving data of the fourth sub-block by using the BP algorithm.

[0060] With reference to the accompanying drawings, Figure 4 , the second aspect of the present application provides a 3D near-field microwave imaging device, the 3D near-field microwave imaging device comprising:

[0061] a dividing module, configured to divide the whole antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array;

[0062] a determining module, configured to determine virtual antenna array elements in each of the first sub-block, the second sub-block, the third sub-block and the fourth sub-block according to the midpoint of each group of phase centers of the transceiving antennas in each sub-block as the equivalent phase center of the virtual antenna;

[0063] a converting module, configured to compensate the transceiving data phase of the antenna array topology pre-acquired according to the virtual antenna array element arrangement into target transceiving data of the virtual antenna, wherein the target transceiving data of the virtual antenna includes target transceiving data of the first sub-block, target transceiving data of the second sub-block, target transceiving data of the third sub-block and target transceiving data of the fourth sub-block;

[0064] an image generating module, configured to perform imaging by using a wave number domain algorithm and a BP algorithm according to the target transceiving data of the virtual antenna.

[0065] By setting the division module, the determination module, the conversion module and the image generation module, the division module is used to divide the entire antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array; the division module is used to divide the entire antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array; the conversion module is used to compensate the transceiving data phase of the antenna array topology pre-acquired according to the virtual antenna array arrangement into the target transceiving data of the virtual antenna, and the target transceiving data of the virtual antenna includes the target transceiving data of the first sub-block, the target transceiving data of the second sub-block, the target transceiving data of the third sub-block and the target transceiving data of the fourth sub-block; the image generation module is used to image by using the wave number domain algorithm and the BP algorithm according to the target transceiving data of the virtual antenna; so that the virtual array can exactly meet the imaging requirements, and no redundant virtual array is generated, so that the resolution and the definition of the imaging can be ensured without reducing the use of the transceiving antenna.

[0066] In one embodiment, the conversion module includes:

[0067] The first sub-computation module is used to calculate the center coordinates of each sub-block and the coordinates of the virtual antenna , wherein, is the center of the sub-block n, is the coordinate of the distance direction of the antenna array, is the coordinate of the transmitting antenna, is the coordinate of the receiving antenna;

[0068] The second sub-computation module is used to calculate the first distance between the transceiving antenna and the center of the imaging area of the sub-block and the second distance between the virtual antenna and the center of the imaging area of the sub-block according to the center coordinates of each sub-block and the coordinates of the virtual antenna, respectively;

[0069] The third sub-computation module is used to calculate the difference between the first distance and the second distance according to the first distance and the second distance , wherein, ​

[0070] It should be noted that, The distance from the transmitting antenna to the center of the imaging area. The distance from the receiving antenna to the imaging center. The distance from the virtual antenna to the imaging center; since electromagnetic wave propagation is two-way, the difference between the first distance and the second distance is calculated. It needs to be subtracted .

[0071] The determining module is configured to determine the distance based on the difference between the first distance and the second distance. Determine the target data transmission and reception of the virtual antenna. ,in, .

[0072] It should be noted that, Indicates the serial number of the transmitting array element. Indicates the sequence number of the receiving array element. This represents the distance from the imaging plane to the antenna plane. express One transmitting antenna, The echo from each receiving antenna, for The index is used for phase compensation. It is the symbol for a complex number. Let f be the spatial spectrum, and k = 2*pi*f / c, where f represents the frequency of the emitted signal and c represents the speed of light.

[0073] Reference Appendix Figure 5 A third aspect of the present invention is to provide a computer device including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the 3D near-field microwave imaging method.

[0074] Memory can be used to store software programs and modules. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory. Memory can primarily include a program storage area and a data storage area. The program storage area can store the operating system, application programs required for the functions, etc.; the data storage area can store data created based on the use of the device, etc. Furthermore, memory can include high-speed random access memory, and can also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, memory can also include a memory controller to provide the processor with access to the memory.

[0075] The internal structure of the computer device can include, but is not limited to, a processor, a network interface and a memory, wherein the processor, the network interface and the memory in the in-vehicle personnel health monitoring terminal can be connected through a bus or other means, and in the embodiments of the present specification Figure 5 are connected through a bus.

[0076] The processor (or CPU (Central Processing Unit)) is the computing core and control core of the in-vehicle personnel health monitoring terminal. The network interface can optionally include a standard wired interface, a wireless interface (such as WI-FI, a mobile communication interface, etc.). The memory is a memory device in the computer device, used to store programs and data. It can be understood that the memory here can be a high-speed RAM storage device, or a non-volatile memory, for example, at least one disk storage device; optionally, it can also be at least one storage device located away from the aforementioned processor. The memory provides a storage space that stores the operating system of the computer device, which can include, but is not limited to, a Windows system (an operating system), Linux (an operating system), etc., and the present application does not limit this; and in the storage space, one or more instructions suitable for being loaded and executed by the processor are also stored, which can be one or more computer programs (including program codes). In the embodiments of the present specification, the processor loads and executes one or more instructions stored in the memory to implement the 3D near-field microwave imaging method provided by the method embodiment.

[0077] The fourth aspect of the present application also provides a computer-readable storage medium, which can be arranged in a live video processing terminal to save at least one instruction, at least one program, a code set or an instruction set related to the 3D near-field microwave imaging method in the method embodiment. The at least one instruction, the at least one program, the code set or the instruction set can be loaded and executed by the processor of the electronic device to implement the 3D near-field microwave imaging method provided by the above-mentioned method embodiment.

[0078] Optionally, in the present embodiment, the above-mentioned storage medium can include, but is not limited to, a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0079] The above-mentioned embodiments are only one of the more preferred specific ways of the present application, and the usual changes and replacements made by those skilled in the art within the scope of the technical solutions of the present application should be included in the protection scope of the present application.

Claims

1. A 3D near-field microwave imaging method, characterized in that, The method comprises the following steps: The entire antenna array topology is divided into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array; According to the divided first sub-block, the second sub-block, the third sub-block and the fourth sub-block, the midpoint of each group of transceiving antenna phase centers on each sub-block is taken as the equivalent phase center of a virtual antenna, and the virtual antenna element arrangement on the first sub-block, the second sub-block, the third sub-block and the fourth sub-block is determined respectively; According to the virtual antenna element arrangement, the transceiving data phase compensation of the antenna array topology pre-acquired is compensated into target transceiving data of the virtual antenna, and the target transceiving data of the virtual antenna comprises target transceiving data of the first sub-block, target transceiving data of the second sub-block, target transceiving data of the third sub-block and target transceiving data of the fourth sub-block; According to the target transceiving data of the virtual antenna, wave number domain algorithm and BP algorithm are used for imaging; according to the virtual antenna element arrangement, the transceiving data phase compensation of the antenna array topology pre-acquired is compensated into target transceiving data of the virtual antenna, and the target transceiving data of the virtual antenna comprises target transceiving data of the first sub-block, target transceiving data of the second sub-block, target transceiving data of the third sub-block and target transceiving data of the fourth sub-block, which comprises: calculating the center coordinates of each sub-block and the coordinates of the virtual antenna wherein, is the center of the sub-block n, is the coordinate of the distance direction of the antenna array, is the coordinate of the transmitting antenna, is the coordinate of the receiving antenna; According to the center coordinates of each sub-block and the coordinates of the virtual antenna, the first distance from the transceiving antenna to the center of the imaging area of the sub-block and the second distance from the virtual antenna to the center of the imaging area of the sub-block are calculated respectively; calculating a difference between the first distance and the second distance based on the first distance and the second distance ; According to a difference between the first distance and the second distance , a target transceiving data of a virtual antenna is determined ; the function expression of the difference between the first distance and the second distance is: ； wherein, is the distance from the transmit antenna to the center of the imaging region, is the distance from the receive antenna to the center of the imaging region, is the distance from the virtual antenna to the center of the imaging region; the virtual antenna is targeted to receive data The functional expression for the target is: ​ wherein denotes the index of the transmit array element, denotes the index of the receive array element, denotes the distance of the imaging plane to the antenna plane, denotes transmit antennas, echoes of receive antennas, is the index for phase compensation, is a complex symbol, is the spatial spectrum, and k = 2*pi*f / c, f denotes the transmit signal frequency, and c denotes the speed of light.

2. The 3D near-field microwave imaging method of claim 1, wherein, According to the target transceiving data of the virtual antenna, wave number domain algorithm and BP algorithm are used for imaging, which comprises that the target transceiving data of the first sub-block, the target transceiving data of the second sub-block and the target transceiving data of the third sub-block are all imaged by using the wave number domain algorithm, and the target transceiving data of the fourth sub-block is imaged by using the BP algorithm.

3. A 3D near-field microwave imaging device, characterized in that The 3D near-field microwave imaging device comprises: A division module is configured to divide the entire antenna array topology into a plurality of first sub-blocks, a plurality of second sub-blocks, a plurality of third sub-blocks and a plurality of fourth sub-blocks, wherein the first sub-block is a closed area surrounded by the receiving antenna array and the transmitting antenna array, the second sub-block is an area between two adjacent transmitting antenna arrays, the third sub-block is an area between two adjacent receiving antenna arrays, and the fourth sub-block is an area surrounded by no antenna array; A determination module is configured to take the midpoint of each group of transceiving antenna phase centers on each sub-block as the equivalent phase center of a virtual antenna, and determine the virtual antenna element arrangement on the first sub-block, the second sub-block, the third sub-block and the fourth sub-block respectively according to the divided first sub-block, the second sub-block, the third sub-block and the fourth sub-block; The conversion module is configured to compensate, according to the virtual antenna array, the transceiving data phase of the antenna array topology pre-acquired transceiving data to target transceiving data of the virtual antenna, wherein the target transceiving data of the virtual antenna comprises target transceiving data of a first sub-block, target transceiving data of a second sub-block, target transceiving data of a third sub-block and target transceiving data of a fourth sub-block. The image generation module is configured to perform imaging by using a wave number domain algorithm and a BP algorithm according to the target transceiving data of the virtual antenna. a first sub-computing module for computing the center coordinates of each sub-block and the coordinates of the virtual antenna wherein, is the center of the sub-block n, is the coordinate of the distance direction of the antenna array, is the coordinate of the transmitting antenna, is the coordinate of the receiving antenna; The second sub-computation module is configured to respectively compute a first distance from the transceiving antenna to the center of the imaging area of each sub-block and a second distance from the virtual antenna to the center of the imaging area of each sub-block according to the center coordinates of each sub-block and the coordinates of the virtual antenna. a third sub-computing module configured to compute a difference between the first distance and the second distance according to the first distance and the second distance ; a determining module configured to determine a target transceiving data of a virtual antenna according to a difference between the first distance and the second distance ; the function expression of the difference between the first distance and the second distance is: ​ ； wherein, is the distance from the transmit antenna to the center of the imaging region, is the distance from the receive antenna to the center of the imaging region, is the distance from the virtual antenna to the center of the imaging region; the virtual antenna is targeted to receive data The functional expression for the target is: ​ wherein denotes the index of the transmit array element, denotes the index of the receive array element, denotes the distance of the imaging plane to the antenna plane, denotes transmit antennas, echoes of receive antennas, is the index for phase compensation, is a complex symbol, is the spatial spectrum, and k = 2*pi*f / c, f denotes the transmit signal frequency, and c denotes the speed of light.

4. An electronic device, comprising: The memory stores a computer program, and the processor executes the computer program to implement the steps of the 3D near-field microwave imaging method in any one of claims 1-2.

5. A storage medium, characterized by The storage medium stores a computer program, and the processor executes the computer program to implement the steps of the 3D near-field microwave imaging method in any one of claims 1-2.

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