CN112180458A - MIMO-based imager antenna layout method, array and imaging detection method - Google Patents
MIMO-based imager antenna layout method, array and imaging detection method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 238000003491 array Methods 0.000 claims description 17
- 238000009827 uniform distribution Methods 0.000 claims description 17
- 238000005070 sampling Methods 0.000 claims description 11
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- 238000004088 simulation Methods 0.000 description 10
- 238000007689 inspection Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/887—Radar or analogous systems specially adapted for specific applications for detection of concealed objects, e.g. contraband or weapons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/9004—SAR image acquisition techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/904—SAR modes
- G01S13/9056—Scan SAR mode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0087—Apparatus or processes specially adapted for manufacturing antenna arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
Abstract
The invention provides an MIMO-based imager antenna layout arrangement method, an MIMO-based imager antenna layout arrangement array and an imaging detection method, and belongs to the field of millimeter wave imaging. The imager antenna array layout method comprises the following steps: determining a horizontal direction aperture and a vertical direction aperture of an imager antenna array to be formed according to imaging requirements, wherein the imager antenna array comprises a receiving antenna array and a transmitting antenna array; and correspondingly arranging the transmitting antenna array and the receiving antenna array on a mobile scanning assembly within the range of the aperture in the horizontal direction, wherein each transmitting antenna in the transmitting antenna array and one receiving antenna in the receiving antenna array form a transmitting-receiving antenna pair, the transmitting antennas are uniformly distributed in the transmitting antenna array, and the receiving antennas are uniformly distributed in the receiving antenna array. The method is applied to an MIMO sparse array arrangement mode, and can effectively reduce the system complexity and the hardware cost.
Description
Technical Field
The invention relates to the field of millimeter wave imaging, in particular to an imager antenna array layout method based on an MIMO sparse array, an imager antenna array based on the MIMO sparse array and an imaging detection method adopting the imager antenna array based on the MIMO sparse antenna array.
Background
In order to obtain a good detection effect, the millimeter wave security inspection imager needs a high enough imaging resolution and signal-to-noise ratio. To cover a sufficient imaging area, millimeter wave security imagers require a sufficiently large array aperture. To suppress the image blurring phenomenon, the sampling interval ds of the antenna needs to be smaller than lambda0/2。
In order to cover the whole array aperture, the existing method adopts a full array layout, that is, as shown in fig. 1, an antenna unit and a corresponding radio frequency transceiving channel are arranged on each antenna sampling point, which greatly increases the system complexity, the implementation difficulty and the hardware cost.
Disclosure of Invention
The invention aims to provide an antenna layout method, an antenna array and an imaging detection method of an imager based on MIMO (multiple input multiple output), so as to at least solve the problems of complicated antenna layout and excessive number of antennas.
In order to achieve the above object, the present invention provides an imager antenna array layout method based on a MIMO sparse array, including:
determining a horizontal direction aperture and a vertical direction aperture of an imager antenna array to be formed according to imaging requirements, wherein the imager antenna array comprises a receiving antenna array and a transmitting antenna array;
and correspondingly arranging the transmitting antenna array and the receiving antenna array on a mobile scanning assembly within the range of the aperture in the horizontal direction, wherein each transmitting antenna in the transmitting antenna array and one receiving antenna in the receiving antenna array form a transmitting-receiving antenna pair, the transmitting antennas are uniformly distributed in the transmitting antenna array, and the receiving antennas are uniformly distributed in the receiving antenna array.
Furthermore, the invention also provides an imager antenna array based on the MIMO sparse array, which is formed by adopting the imager antenna array layout method based on the MIMO sparse array.
Preferably, the transmitting antenna arrays are two groups of transmitting antenna arrays which are horizontally arranged; the receiving antenna array is a group of receiving antenna arrays which are horizontally arranged; the two groups of transmitting antenna arrays are positioned on two sides of the group of receiving antenna arrays.
Preferably, the interval between the transmitting antenna array and the receiving antenna array is dtr, dtr is ds, the interval between the transmitting antennas in each group of transmitting antenna arrays is dt, dt is 2 ds, the interval between the receiving antennas in the receiving antenna array is dr, dr is Nt ds, and the horizontal aperture L is Nt Nr ds; nt is the number of transmit antennas, Nr is the number of receive antennas, ds is the equivalent sampling interval spacing and ds<λ0/2，λ0The wavelength of the electromagnetic waves used for the imager antenna array.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 2; the number of receiving antennas Nr120; the uniform interval dr of the receiving antenna is 10 mm.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 4; the number Nr of the receiving antennas is 60, and the uniform distribution interval dr of the receiving antennas is 20 mm; the uniform distribution interval dt of the transmitting antenna is 10 mm.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 8; the number Nr of the receiving antennas is 30, and the uniform distribution interval dr of the receiving antennas is 40 mm; the uniform distribution interval dt of the transmitting antenna is 10 mm.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 16; the number Nr of the receiving antennas is 15, and the uniform distribution interval dr of the receiving antennas is 80 mm; the uniform distribution interval dt of the transmitting antenna is 10 mm.
Further, the present invention also provides an imaging detection method using an imager antenna array based on a MIMO sparse antenna array, where the imager antenna array is the aforementioned imager antenna array based on a MIMO sparse array, and the imaging detection method includes:
moving the movable scanning component in the range of the vertical aperture, wherein the distance of each movement is ds, ds<λ0/2；λ0Is the wavelength of the electromagnetic wave of the moving scanning assembly.
Through the technical scheme, the antenna array is distributed by the mobile scanning assembly according to the sampling interval ds, and the number of the required antenna units is reduced to the sum of the number of the transmitting antennas Nt and the number of the receiving antennas Nr by using a MIMO sparse array distribution mode, so that the system complexity and the hardware cost can be effectively reduced.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of a full-matrix layout of a conventional millimeter-wave human body security inspection imager;
FIG. 2 is a scanning schematic diagram of an imaging detection method of the present invention using an imager antenna array based on a MIMO sparse array;
FIG. 3 is a schematic flow chart of an imaging detection method of the present invention using an imager antenna array based on a MIMO sparse array;
FIG. 4 is a schematic diagram of the position of the receiving and transmitting antenna pair of the MIMO sparse array-based imager antenna array of the present invention with respect to the equivalent sampling point;
FIG. 5 is a schematic diagram of the antenna layout of the mobile scanning assembly in the MIMO sparse array based imager antenna array of the present invention;
FIG. 6 is a schematic diagram of a first antenna layout of a mobile scanning assembly in an antenna array of an MIMO sparse array-based imager and a schematic diagram of a point target imaging result according to the present invention;
FIG. 7 is a schematic diagram of a second antenna layout of a mobile scanning assembly in an antenna array of an MIMO sparse array-based imager and a schematic diagram of a point target imaging result according to the present invention;
FIG. 8 is a schematic diagram of a third antenna layout of a mobile scanning assembly in an antenna array of an MIMO sparse array-based imager and a schematic diagram of a point target imaging result according to the present invention;
fig. 9 is a schematic diagram of a fourth antenna layout of the mobile scanning assembly in the antenna array of the MIMO-based sparse array imager and a schematic diagram of a point target imaging result according to the present invention;
fig. 10 is a human body imaging real-time diagram corresponding to a third antenna layout of the mobile scanning assembly in the antenna array of the MIMO sparse array-based imager of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1 to 5, an embodiment of the present invention provides an imager antenna array layout method based on a MIMO sparse array, including: determining a horizontal direction aperture and a vertical direction aperture of an imager antenna array to be formed according to imaging requirements, wherein the imager antenna array comprises a receiving antenna array and a transmitting antenna array; and correspondingly arranging the transmitting antenna array and the receiving antenna array on a mobile scanning assembly within the range of the aperture in the horizontal direction, wherein each transmitting antenna in the transmitting antenna array and one receiving antenna in the receiving antenna array form a transmitting-receiving antenna pair, the transmitting antennas are uniformly distributed in the transmitting antenna array, and the receiving antennas are uniformly distributed in the receiving antenna array.
Further, the embodiment of the invention also provides an imager antenna array formed by the layout method based on the MIMO sparse array.
According to the application requirements of the millimeter wave human body security inspection imager, the method of the invention develops the research and design of antenna layout arrangement. For human body security inspection imaging, the imaging requirement is 1.2m (human body width direction) × 2.0m (human body height direction). The working center frequency point of the system of the embodiment is 25GHz and the corresponding wavelength lambda012 mm. In order to inhibit the imaging blurring phenomenon, the array layout equivalent sampling point interval is designed to be 5 mm.
Optionally, the transmitting antenna arrays are two groups of transmitting antenna arrays arranged horizontally; the receiving antenna array is a group of receiving antenna arrays which are horizontally arranged; the two groups of transmitting antenna arrays are positioned on two sides of the group of receiving antenna arrays.
Optionally, an interval between the transmitting antenna array and the receiving antenna array is dtr, and dtr is ds; the uniform distribution interval of the transmitting antennas is dt, dt is 2 × ds, and the number of the transmitting antennas is Nt; the uniform distribution interval of the receiving antenna is dr, and dr is Nt ds, and the receiving antennaThe number Nr. There may be a vertical separation between the transmit antenna array and the receive antenna array, which may preferably be less than 10 x λ for better acquisition of the imaging demand signal0Any value within the range. The size of the horizontal aperture formed by the arrangement is L ═ Nt × (rs), and the size meets the horizontal aperture of the imager antenna array to be formed.
Further, an embodiment of the present invention further provides an imaging detection method using an imager antenna array based on a MIMO sparse array, where the imager antenna array is the imager antenna array based on the MIMO sparse array, and the imaging detection method includes: moving the movable scanning component in the range of the vertical aperture, wherein the distance of each movement is ds, ds<λ0/2；λ0Is the wavelength of the electromagnetic wave of the moving scanning assembly.
Specifically, the antenna layout mode of the mobile scanning assembly forms a one-dimensional full-array layout, namely the X-axis direction, and then the mobile scanning assembly is installed on a machine to perform scanning in the Y-axis direction; the antenna array is moved along the Y axis by the sampling interval ds distance and data acquisition is carried out after the cycle, and the whole aperture test is finished.
Furthermore, the imaging instrument antenna layout and arrangement method based on the MIMO sparse array provided by the invention reduces the number of antenna units and radio frequency transceiving channels, realizes cost compression, effectively reduces the complexity of system hardware, and lays a solid foundation for the commercial popularization of the millimeter wave human body security inspection imaging instrument.
As shown in fig. 4, by using the MIMO sparse array technique, Nr × Nt transceiver antenna pairs can be formed for Nr receive antennas and Nt transmit antennas, and it can be ensured that each transceiver antenna pair can be regarded as an equivalent sampling point position of a midpoint of the transceiver antenna pair, thereby satisfying the signal input condition by using the existing algorithm; for example, the BP (Error Back Propagation) algorithm is used. Through the reasonable layout of the positions of the transmitting and receiving antennas, the equivalent sampling point positions of Nr Nt transmitting and receiving antenna pairs can form an evenly distributed array with equal intervals. The total number of the Nr receiving antennas is Nr, the Nr receiving antennas are positioned in the center of the antenna array, and the spacing between the receiving antennas is dr to (Nt/2) dt to (Nt/2) ds to Nt ds. Therefore, the equivalent antenna aperture size formed by the array is L ═ Nt ═ Nr ×, ds. In order to form an antenna array with an aperture size L ═ Nt ×, Nr ×, ds and a sampling interval ds, a conventional layout is adopted, and as shown in fig. 2, the number of antenna elements required is Nt × Nr; by adopting the MIMO sparse array arrangement mode provided by the invention, the number of the required antenna units is reduced to Nt + Nr, and the system complexity and the hardware cost can be effectively reduced.
In order to better explain the antenna layout method of the imager based on the MIMO sparse array, the following antenna array layout implementation method adopting 4 kinds of moving scanning assemblies performs imaging simulation contrast test on a point target object.
Fig. 6 shows an antenna array layout of the first mobile scanning assembly.
The aperture of the receiving antenna array in the horizontal direction (X axis) is 1.2 m; the vertical direction (Y axis) aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of transmitting antennas Nt is 2; the number Nr of receiving antennas is 120; the uniform interval dr of the receiving antenna is 10 mm. And then accessing all the arrayed antennas into a simulation system based on the MIMO sparse array, and obtaining a schematic diagram of the imaging result of the point target object obtained through simulation by adopting a BP algorithm.
Fig. 7 shows a second antenna array layout of the mobile scanning assembly.
The aperture of the receiving antenna array in the horizontal direction (X axis) is 1.2 m; the vertical direction (Y axis) aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of transmitting antennas Nt is 4; the number Nr of the receiving antennas is 60, and the uniform distribution interval dr of the receiving antennas is 20 mm; transmitting antennaThe uniform spacing dt is 10 mm. And then accessing all the arrayed antennas into a simulation system based on the MIMO sparse array, and obtaining a schematic diagram of the imaging result of the point target object obtained through simulation by adopting a BP algorithm.
Fig. 8 shows an antenna array layout of a third mobile scanning assembly.
The aperture of the receiving antenna array in the horizontal direction (X axis) is 1.2 m; the vertical direction (Y axis) aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of transmitting antennas Nt is 8; the number Nr of the receiving antennas is 30, and the uniform distribution interval dr of the receiving antennas is 40 mm; the uniform interval dt of the transmitting antenna is 10 mm. And then accessing all the arrayed antennas into a simulation system based on the MIMO sparse array, and obtaining a schematic diagram of the imaging result of the point target object obtained through simulation by adopting a BP algorithm.
Fig. 9 shows an antenna array layout of a fourth mobile scanning assembly.
The aperture of the receiving antenna array in the horizontal direction (X axis) is 1.2 m; the vertical direction (Y axis) aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of transmitting antennas Nt is 16; the number Nr of the receiving antennas is 15, and the uniform distribution interval dr of the receiving antennas is 80 mm; the uniform interval dt of the transmitting antenna is 10 mm. And then accessing all the arrayed antennas into a simulation system based on the MIMO sparse array, and obtaining a schematic diagram of the imaging result of the point target object obtained through simulation by adopting a BP algorithm.
According to the target imaging result schematic diagrams (fig. 6-9) obtained by the antenna array layout embodiments of the 4 kinds of mobile scanning assemblies, the waveform image in the range of-50 mm to 50mm in the abscissa in the target imaging result schematic diagrams (fig. 6-9) corresponds to the image generated by the point target object, and the waveform images in the rest areas correspond to the interference images; as can be seen from the target imaging result diagrams of fig. 6 to 9, as the number of antennas decreases, the interference image around the image generated by the point target object starts to increase in corresponding waveforms, and the imaging blur level gradually increases. The third antenna array layout implementation of the mobile scanning assembly (shown in fig. 8) is the final preferred array layout, considering the system cost and the imaging quality.
According to the final optimal array layout (shown in fig. 8), the method is used for detecting a human body, and a BP algorithm is adopted to obtain a human body actual measurement image through a simulation system based on an MIMO sparse array, wherein the human body actual measurement image is shown in fig. 10; and under the condition of reducing the number of the antennas, the image identification quality is ensured.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. An imager antenna array layout method based on a MIMO sparse array is characterized by comprising the following steps:
determining a horizontal direction aperture and a vertical direction aperture of an imager antenna array to be formed according to imaging requirements, wherein the imager antenna array comprises a receiving antenna array and a transmitting antenna array;
and correspondingly arranging the transmitting antenna array and the receiving antenna array on a mobile scanning assembly within the range of the aperture in the horizontal direction, wherein each transmitting antenna in the transmitting antenna array and one receiving antenna in the receiving antenna array form a transmitting-receiving antenna pair, the transmitting antennas are uniformly distributed in the transmitting antenna array, and the receiving antennas are uniformly distributed in the receiving antenna array.
2. An imager antenna array based on a MIMO sparse array formed using the layout method of claim 1.
3. The imager antenna array of claim 2, wherein the transmit antenna arrays are two sets of transmit antenna arrays arranged horizontally; the receiving antenna array is a group of receiving antenna arrays which are horizontally arranged; the two groups of transmitting antenna arrays are positioned on two sides of the group of receiving antenna arrays.
4. The imager antenna array of claim 3, wherein the spacing between the transmit antenna array and the receive antenna array is dtr, dtr-ds, the uniform spacing between the transmit antennas in each set of transmit antenna arrays is dt, dt-2 ds, the uniform spacing between the receive antennas in the receive antenna array is dr, dr-Nt-ds, and the horizontal aperture L-Nt-Nr-ds; nr is the number of receiving antennas; nt is the number of transmit antennas, ds is the equivalent sampling interval spacing and ds<λ0/2，λ0The wavelength of the electromagnetic waves used for the imager antenna array.
5. The imager antenna array of claim 4, wherein the receive antenna array has a horizontal aperture of 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 2; the number Nr of the receiving antennas is 120; the uniform interval dr of the receiving antenna is 10 mm.
6. The imager antenna array of claim 4, wherein the receive antenna array has a horizontal aperture of 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 4; the number Nr of the receiving antennas is 60, and the uniform distribution interval dr of the receiving antennas is 20 mm; the uniform distribution interval dt of the transmitting antenna is 10 mm.
7. The imager antenna array of claim 4, wherein the receive antenna array has a horizontal aperture of 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 8; the number Nr of the receiving antennas is 30, and the uniform distribution interval dr of the receiving antennas is 40 mm; the uniform distribution interval dt of the transmitting antenna is 10 mm.
8. The imager antenna array of claim 4, wherein the receive antenna array has a horizontal aperture of 1.2 m; the vertical aperture of the imager antenna array is 2.0 m; lambda [ alpha ]012 mm; the number of the transmitting antennas Nt is 16; the number Nr of the receiving antennas is 15, and the uniform distribution interval dr of the receiving antennas is 80 mm; the uniform distribution interval dt of the transmitting antenna is 10 mm.
9. An imaging detection method using an imager antenna array based on a MIMO sparse antenna array, wherein the imager antenna array is the imager antenna array based on the MIMO sparse array of claim 2, the imaging detection method comprising:
moving the movable scanning component in the range of the vertical aperture, wherein the distance of each movement is ds, ds<λ0/2；λ0Is the wavelength of the electromagnetic wave of the moving scanning assembly.
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| CN113690590A (en) * | 2021-08-23 | 2021-11-23 | 安徽大学 | Multiple-input multiple-output sparse antenna |
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