CN112180458B - Layout and array method of millimeter wave human body security inspection imager antenna based on MIMO - Google Patents
Layout and array method of millimeter wave human body security inspection imager antenna based on MIMO Download PDFInfo
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- 238000007689 inspection Methods 0.000 title abstract description 6
- 238000003384 imaging method Methods 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000003491 array Methods 0.000 claims description 22
- 238000005070 sampling Methods 0.000 claims description 11
- 238000009827 uniform distribution Methods 0.000 claims description 9
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
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Abstract
The invention provides a layout and array method, an array and an imaging detection method of an antenna of a millimeter wave human body security inspection imager based on MIMO, and belongs to the field of millimeter wave imaging. The layout method of the antenna array of the imager comprises the following steps: determining a horizontal aperture and a vertical 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 in the range of the aperture in the horizontal direction, the transmitting antenna array and the receiving antenna array are correspondingly arranged on the mobile scanning assembly, 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 invention is applied to an MIMO sparse array mode, and can effectively reduce the complexity of the system and the hardware cost.
Description
Technical Field
The invention relates to the millimeter wave imaging field, in particular to an imager antenna array layout method based on a 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 high enough imaging resolution and signal-to-noise ratio. To cover enough imaging area, millimeter wave security imagers require a large enough array aperture. To suppress the imaging blurring phenomenon, the antenna sampling interval ds needs to be smaller than λ 0 /2。
In order to cover the entire 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 transceiver channel are laid out on each antenna sampling point, which greatly increases the complexity, implementation difficulty and hardware cost of the system.
Disclosure of Invention
The embodiment of the invention aims to provide an antenna layout method, an array and an imaging detection method of an imaging instrument based on MIMO (multiple input multiple output), so as to at least solve the problems of complex 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 aperture and a vertical 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 in the range of the aperture in the horizontal direction, the transmitting antenna array and the receiving antenna array are correspondingly arranged on the mobile scanning assembly, 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 method for arranging the imager antenna array 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 arrays are a group of receiving antenna arrays which are horizontally arranged; the two sets of transmitting antenna arrays are positioned on two sides of the set of receiving antenna arrays.
Preferably, the interval between the transmitting antenna array and the receiving antenna array is dtr, dtr=ds, the uniform interval of the transmitting antennas in each group of transmitting antenna arrays is dt, dt=2×ds, the uniform interval of the receiving antennas in the receiving antenna array is dr, dr=nt×ds, and the horizontal aperture l=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<λ 0 /2，λ 0 Electromagnetic wave wavelengths used for the imager antenna array.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number nt=2 of the transmitting antennas; the number nr=120 of the receiving antennas; the uniform distribution interval dr=10mm of the receiving antennas.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number nt=4 of the transmitting antennas; the number nr=60 of the receiving antennas, and the uniform distribution interval dr=20mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antenna.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number Nt of the transmitting antennas=8; the number nr=30 of the receiving antennas, and the uniform distribution interval dr=40 mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antenna.
Preferably, the aperture of the receiving antenna array in the horizontal direction is 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number nt=16 of the transmitting antennas; the number nr=15 of the receiving antennas, and the uniform distribution interval dr=80 mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antenna.
Furthermore, the invention also provides an imaging detection method adopting the imaging antenna array based on the MIMO sparse antenna array, wherein the imaging antenna array is the imaging antenna array based on the MIMO sparse array, and the imaging detection method comprises the following steps:
moving the moving scanning assembly within the range of the vertical aperture, wherein the distance between each movement is ds, ds<λ 0 /2；λ 0 The wavelength of electromagnetic waves of the assembly is scanned for movement.
According to the technical scheme, the antenna arrays are distributed according to the sampling interval ds by the mobile scanning assembly, the MIMO sparse array distribution mode is utilized, the number of required antenna units is reduced to the sum of the number Nt of transmitting antennas and the number Nr of receiving antennas, and the complexity of the system 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 are included to provide a further understanding of 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, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of a full array layout of a conventional millimeter wave human body security imager;
FIG. 2 is a scanning schematic diagram of an imaging detection method employing an MIMO sparse array-based imager antenna array in accordance with the present invention;
FIG. 3 is a flow chart of an imaging detection method employing an imager antenna array based on a MIMO sparse array in accordance with the present invention;
fig. 4 is a schematic diagram of equivalent sampling points of a transceiver antenna of an imager antenna array based on a MIMO sparse array according to the present invention;
FIG. 5 is a schematic diagram of an antenna layout of a mobile scanning assembly in an MIMO sparse array-based imager antenna array of the present invention;
FIG. 6 is a schematic diagram of a first antenna layout and a schematic diagram of a point target imaging result of a mobile scanning assembly in an MIMO sparse array-based imager antenna array of the present invention;
FIG. 7 is a schematic diagram of a second antenna layout and dot target imaging results of a mobile scanning assembly in an MIMO sparse array-based imager antenna array of the present invention;
FIG. 8 is a schematic diagram of a third antenna layout and a schematic diagram of a spot target imaging result of a mobile scanning assembly in an MIMO sparse array-based imager antenna array according to the present invention;
FIG. 9 is a schematic diagram of a fourth antenna layout and a schematic diagram of a point target imaging result of a mobile scanning assembly in an MIMO sparse array-based imager antenna array according to the present invention;
fig. 10 is a diagram of a third antenna layout of a mobile scanning assembly in an antenna array of an MIMO sparse array-based imager according to the present invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
As shown in fig. 1-5, an embodiment of the present invention provides an imager antenna array layout method based on a MIMO sparse array, including: determining a horizontal aperture and a vertical 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 in the range of the aperture in the horizontal direction, the transmitting antenna array and the receiving antenna array are correspondingly arranged on the mobile scanning assembly, 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 embodiment of the invention also provides an imager antenna array formed by adopting 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 and array. For human body security imaging, the imaging requirement is 1.2m (human body width direction) x 2.0m (human body height direction). The working center frequency point of the system of the embodiment is 25GHz and corresponds to the wavelength lambda 0 =12 mm. In order to inhibit the imaging blurring phenomenon, the designed array layout equivalent sampling point interval is 5mm.
Optionally, the transmitting antenna arrays are two groups of transmitting antenna arrays horizontally arranged; the receiving antenna arrays are a group of receiving antenna arrays which are horizontally arranged; the two sets of transmitting antenna arrays are positioned on two sides of the set of receiving antenna arrays.
Optionally, the spacing between the transmitting antenna array and the receiving antenna array is dtr, dtr=ds; the uniformly distributed interval of the transmitting antennas is dt, dt=2×ds, and the number of the transmitting antennas is Nt; the uniformly distributed interval of the receiving antennas is dr, dr=nt×ds, and the number of the receiving antennas 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 lambda for better acquisition of the imaging demand signal 0 Any value within the range. The horizontal aperture size formed by such an arrangement is l=nt×nr×ds, satisfying 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 an imager antenna array based on a MIMO sparse array as described above, and the imaging detection method includes: move the saidThe dynamic scanning component moves in the range of the aperture in the vertical direction, and the distance between each movement is ds and ds<λ 0 /2；λ 0 The wavelength of electromagnetic waves of the assembly is scanned for movement.
Specifically, the antenna layout mode of the mobile scanning assembly forms a one-dimensional full array layout, namely an X-axis direction, and then the mobile scanning assembly is arranged on a machine to scan in a Y-axis direction; after data acquisition of one row is completed, the mobile scanning assembly moves the antenna array along the Y-axis by a sampling interval ds for data acquisition through the existing mechanical scanning system (the mobile scanning assembly is preferably a mounting plate which is used for fixing the transmitting antenna and the receiving antenna and is connected with a vertically arranged guide rail through a sliding block, and the mechanical scanning system drives the mounting plate to move on the guide rail), so that data acquisition is performed, the whole aperture test is completed, and the number of antenna units and radio frequency receiving and transmitting channels can be effectively reduced by adopting the working mechanism.
Furthermore, the method for arranging the antenna of the image forming device based on the MIMO sparse array reduces the number of antenna units and radio frequency receiving and transmitting channels, realizes cost compression, effectively reduces the complexity of system hardware, and lays a solid foundation for commercialized popularization of millimeter wave human body security inspection image forming devices.
As shown in fig. 4, with the MIMO sparse array technology, for Nr receiving antennas and Nt transmitting antennas, nr transmitting antenna pairs may be formed, and each transmitting antenna pair may be guaranteed to be regarded as an equivalent sampling point position of a midpoint of the transmitting antenna pair, so that signal input conditions with existing algorithms are satisfied; for example, the BP (Error Back Propagation ) algorithm is used. Through reasonable layout of the positions of the receiving and transmitting antennas, equivalent sampling points of Nr times Nt receiving and transmitting antenna pairs can form an equally-spaced evenly-distributed array. The total number of Nr receiving antennas is Nr, the receiving antennas are located in the center of the antenna array, and the receiving antenna interval is dr= (Nt/2) ×dt= (Nt/2) ×2×ds) =nt×ds. Thus, the array forms an equivalent antenna aperture size of l=nt×nr×ds. To form an antenna array with aperture size l=nt×nr×ds and sampling interval ds, a conventional layout is adopted, as shown in fig. 2, where the number of required antenna elements is nt×nr; by adopting the MIMO sparse array arrangement mode provided by the invention, the number of required antenna units is reduced to Nt+Nr, and the complexity of the system and the hardware cost can be effectively reduced.
In order to better illustrate the MIMO sparse array-based imager antenna layout method, the following antenna array layout implementation using 4 mobile scanning assemblies performs an imaging simulation contrast test on a point target object.
Fig. 6 shows an antenna array layout embodiment of a first mobile scanning component.
The aperture in the horizontal direction (X-axis) of the receiving antenna array is 1.2m; the aperture in the vertical direction (Y-axis) of the imager antenna array is 2.0m; lambda (lambda) 0 =12 mm; the number of transmit antennas nt=2; the number of receive antennas nr=120; the uniform distribution interval dr=10mm of the receiving antennas. And then all the array antennas are connected into a simulation system based on the MIMO sparse array, and a point target object imaging result schematic diagram is obtained through simulation by adopting a BP algorithm.
Fig. 7 shows an antenna array layout embodiment of a second mobile scanning component.
The aperture in the horizontal direction (X-axis) of the receiving antenna array is 1.2m; the aperture in the vertical direction (Y-axis) of the imager antenna array is 2.0m; lambda (lambda) 0 =12 mm; the number of transmit antennas nt=4; the number of the receiving antennas Nr=60, and the uniformly distributed interval dr=20mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antennas. And then all the array antennas are connected into a simulation system based on the MIMO sparse array, and a point target object imaging result schematic diagram is obtained through simulation by adopting a BP algorithm.
Fig. 8 shows an antenna array layout embodiment of a third mobile scanning component.
The aperture in the horizontal direction (X-axis) of the receiving antenna array is 1.2m; the aperture in the vertical direction (Y-axis) of the imager antenna array is 2.0m; lambda (lambda) 0 =12 mm; the number of transmit antennas nt=8; the number of the receiving antennas Nr=30, and the uniformly distributed interval dr=40 mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antennas. Then all are arranged into arraysAnd (3) accessing an antenna into a simulation system based on the MIMO sparse array, and obtaining a point target object imaging result schematic diagram through simulation by adopting a BP algorithm.
An antenna array layout embodiment of a fourth mobile scanning assembly is shown in fig. 9.
The aperture in the horizontal direction (X-axis) of the receiving antenna array is 1.2m; the aperture in the vertical direction (Y-axis) of the imager antenna array is 2.0m; lambda (lambda) 0 =12 mm; the number of transmit antennas nt=16; the number of the receiving antennas Nr=15, and the uniformly distributed interval dr=80 mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antennas. And then all the array antennas are connected into a simulation system based on the MIMO sparse array, and a point target object imaging result schematic diagram is obtained through simulation by adopting a BP algorithm.
The waveform images within the range of-50 mm to 50mm in the abscissa in the target imaging result diagrams (fig. 6-9) correspond to images generated by the point target object, and the waveform images of the rest areas correspond to interference images; as can be seen from the target imaging result diagrams of fig. 6 to 9, the interference image around the image generated by the point target object starts to increase with the decrease of the number of antennas, the corresponding waveform of the interference image starts to increase, and the imaging blur level gradually increases. The antenna array layout implementation of the third mobile scanning component (shown in fig. 8) is the final preferred array layout, taking into account both system cost and imaging quality.
According to the final preferred array layout (shown in fig. 8), the simulation system based on the MIMO sparse array is used for detecting the human body, and the BP algorithm is adopted to obtain a human body actual measurement image as shown in fig. 10; under the condition of reducing the number of antennas, the image recognition quality is ensured.
The alternative embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the embodiments of the present invention within the scope of the technical concept of the embodiments of the present invention, and all the simple modifications belong to the protection scope of the embodiments of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of embodiments of the invention are not described in detail.
In addition, any combination of the various embodiments of the present invention may be made, so long as it does not deviate from the idea of the embodiments of the present invention, and it should also be regarded as what is disclosed in the embodiments of the present invention.
Claims (6)
1. An imager antenna array based on a MIMO sparse array is characterized in that a horizontal aperture and a vertical aperture of the imager antenna array to be formed are determined according to imaging requirements, and the imager antenna array comprises a receiving antenna array and a transmitting antenna array; in the range of the aperture in the horizontal direction, the transmitting antenna array and the receiving antenna array are correspondingly arranged on a mobile scanning assembly, 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 so as to obtain an imager antenna array;
the transmitting antenna arrays are two groups of transmitting antenna arrays which are horizontally arranged; the receiving antenna arrays are a group of receiving antenna arrays which are horizontally arranged; the two groups of transmitting antenna arrays are positioned at two sides of the group of receiving antenna arrays;
the interval between the transmitting antenna array and the receiving antenna array is dtr, dtr=ds, the uniformly distributed interval of the transmitting antennas in each group of transmitting antenna arrays is dt, dt=2×ds, the uniformly distributed interval of the receiving antennas in the receiving antenna arrays is dr, dr=nt×ds, and the horizontal aperture l=nt×nr×ds; nr is the number of receive antennas; nt is the number of transmit antennas, ds is the equivalent sampling interval spacing and ds<λ 0 /2，λ 0 An electromagnetic wave wavelength used for the imager antenna array; the transmitting antennaA vertical interval is arranged between the line array and the receiving antenna array, and the vertical interval is less than 10 x lambda 0 Any value within the range.
2. The imager antenna array of claim 1, wherein said receiver antenna array has a horizontal aperture of 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number nt=2 of the transmitting antennas; the number nr=120 of the receiving antennas; the uniform distribution interval dr=10mm of the receiving antennas.
3. The imager antenna array of claim 1, wherein said receiver antenna array has a horizontal aperture of 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number nt=4 of the transmitting antennas; the number nr=60 of the receiving antennas, and the uniform distribution interval dr=20mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antenna.
4. The imager antenna array of claim 1, wherein said receiver antenna array has a horizontal aperture of 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number nt=8 of the transmitting antennas; the number nr=30 of the receiving antennas, and the uniform distribution interval dr=40 mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antenna.
5. The imager antenna array of claim 1, wherein said receiver antenna array has a horizontal aperture of 1.2m; the aperture of the antenna array of the imager in the vertical direction is 2.0m; lambda (lambda) 0 =12 mm; the number nt=16 of the transmitting antennas; the number nr=15 of the receiving antennas, and the uniform distribution interval dr=80 mm of the receiving antennas; the equipartition interval dt=10mm of transmitting antenna.
6. An imaging detection method adopting an imager antenna array based on a MIMO sparse antenna array, wherein the imager antenna array is the MIMO sparse array-based imager antenna array of claim 1, the imaging detection method comprising:
moving the moving scanning assembly within the range of the vertical aperture, wherein the distance between each movement is ds, ds<λ 0 /2；λ 0 The wavelength of electromagnetic waves of the assembly is scanned for movement.
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