Array panel for millimeter wave transceiving, security inspection device and control method thereof

Abstract

Provided is an array panel for millimeter wave transceiving, the array panel comprising at least one sub-panel, each of the at least one sub-panel comprising a plurality of millimeter wave transceiving modules arranged in an array along at least one of a first direction and a second direction; each of the plurality of millimeter wave transceiving modules comprising a plurality of millimeter wave transceiving units, in each millimeter wave transceiving module, the plurality of millimeter wave transceiving units arranged in an array along at least one of the first direction and the second direction; each of the plurality of millimeter wave transceiving units comprising a plurality of transmitting antennas and a plurality of receiving antennas, the plurality of transmitting antennas arranged along the first direction, the plurality of receiving antennas arranged along the second direction, a midpoint of a line connecting each of the plurality of transmitting antennas and a corresponding one of the plurality of receiving antennas serving as an equivalent phase center, the plurality of transmitting antennas and the plurality of receiving antennas arranged such that the equivalent phase centers are arranged into a two-dimensional array.

Description

Technical Field

[0001] This disclosure relates to the field of security detection technology, specifically to an array panel for millimeter-wave transceiver, security inspection equipment, and control method thereof. Background Technology

[0002] X-ray machines are typically used for security checks. Because X-rays are ionizing, they are mainly used to detect luggage. However, if they are used in human body security checks, the public may question their safety.

[0003] The information disclosed in this section is only for understanding the background of the inventive concept of this disclosure, and therefore may include information that does not constitute prior art. Summary of the Invention

[0004] According to one aspect of this disclosure, an array panel for millimeter-wave transceiver is provided, the array panel comprising at least one sub-panel, each of the at least one sub-panel comprising a plurality of millimeter-wave transceiver modules, the plurality of millimeter-wave transceiver modules being arranged in an array along at least one of a first direction and a second direction, the first direction and the second direction intersecting; each of the plurality of millimeter-wave transceiver modules comprising a plurality of millimeter-wave transceiver units, in each millimeter-wave transceiver module, the plurality of millimeter-wave transceiver units being arranged in an array along at least one of the first direction and the second direction; each of the plurality of millimeter-wave transceiver units comprising a plurality of transmitting antennas and a plurality of receiving antennas, the plurality of transmitting antennas being arranged along the first direction, the plurality of receiving antennas being arranged along the second direction, the midpoint of the line connecting each of the plurality of transmitting antennas and a corresponding receiving antenna among the plurality of receiving antennas serving as an equivalent phase center, the plurality of transmitting antennas and the plurality of receiving antennas being arranged such that the equivalent phase centers are arranged in a two-dimensional array.

[0005] According to some exemplary embodiments, the at least one sub-panel includes a first sub-panel and a second sub-panel, the first sub-panel and the second sub-panel are spliced ​​together, and a first predetermined angle is formed between the first sub-panel and the second sub-panel.

[0006] According to some exemplary embodiments, the at least one sub-panel includes a first sub-panel, a second sub-panel, and a third sub-panel, wherein the second sub-panel and the third sub-panel are respectively spliced ​​on opposite sides of the first sub-panel, a first predetermined angle is formed between the first sub-panel and the second sub-panel, and a second predetermined angle is formed between the first sub-panel and the third sub-panel.

[0007] According to some exemplary embodiments, the first predetermined angle is substantially equal to the second predetermined angle.

[0008] According to some exemplary embodiments, the first predetermined included angle is between 30° and 150°.

[0009] According to some exemplary embodiments, the at least one sub-panel includes a heart rate detection device for detecting the heart rate of the human being being detected.

[0010] On the other hand, an array panel for millimeter-wave transceiver is also provided. The array panel includes a first sub-panel, a second sub-panel, and a third sub-panel. The second sub-panel and the third sub-panel are respectively spliced ​​on opposite sides of the first sub-panel. The first sub-panel is arranged along a first arrangement direction, the second sub-panel is arranged along a second arrangement direction, and the third sub-panel is arranged along a third arrangement direction. The second arrangement direction intersects the first arrangement direction at a first predetermined angle, and the third arrangement direction intersects the first arrangement direction at a second predetermined angle.

[0011] Each of the first sub-panel, the second sub-panel, and the third sub-panel includes multiple millimeter-wave units. When the second sub-panel and the third sub-panel are both unfolded into the plane where the first sub-panel is located, the millimeter-wave units included in the first sub-panel, the second sub-panel, and the third sub-panel form a millimeter-wave unit array, which includes:

[0012] A plurality of first millimeter-wave transceiver units are arranged in an array along a first direction and a second direction. Each first millimeter-wave transceiver unit includes at least two rows of receiving antennas and at least two columns of transmitting antennas. In each row of receiving antennas, a plurality of receiving antennas are arranged along the first direction. In each column of transmitting antennas, a plurality of transmitting antennas are arranged along the second direction.

[0013] A plurality of second millimeter-wave transceiver units are arranged in an array along a second direction. Two columns of the second millimeter-wave transceiver units are respectively disposed on a first side and a second side of the array panel, the first side and the second side being opposite sides of the array panel along the first direction. Each second millimeter-wave transceiver unit includes two rows of receiving antennas and one column of transmitting antennas. In each row of receiving antennas, multiple receiving antennas are arranged along the first direction; in each column of transmitting antennas, multiple transmitting antennas are arranged along the second direction.

[0014] Multiple millimeter-wave receiving antenna units are arranged in an array along a first direction. Two rows of millimeter-wave receiving antenna units are respectively disposed on the third and fourth sides of the array panel. The third and fourth sides are opposite sides of the array panel along a second direction. Each millimeter-wave receiving antenna unit includes only one row of receiving antennas. In one row of receiving antennas, multiple receiving antennas are arranged along the first direction.

[0015] According to some exemplary embodiments, in a column of second millimeter-wave transceiver units located on a first side of the array panel, a column of transmit antennas for each second millimeter-wave transceiver unit is disposed on the side of the column of second millimeter-wave transceiver units close to the first millimeter-wave transceiver unit; and / or, in a column of second millimeter-wave transceiver units located on a second side of the array panel, a column of transmit antennas for each second millimeter-wave transceiver unit is disposed on the side of the column of second millimeter-wave transceiver units close to the first millimeter-wave transceiver unit.

[0016] According to some exemplary embodiments, the number of second millimeter-wave transceiver units in a column of second millimeter-wave transceiver units is equal to the number of first millimeter-wave transceiver units in a column of first millimeter-wave transceiver units; and / or, the number of millimeter-wave receiving antenna units in a row of millimeter-wave receiving antenna units is equal to the sum of the number of first millimeter-wave transceiver units and second millimeter-wave transceiver units located in the same row.

[0017] According to some exemplary embodiments, in the millimeter-wave unit array, multiple rows of transmitting antennas are arranged in an array along a first direction and a second direction to form an e-row f-column transmitting antenna array; multiple rows of receiving antennas are arranged in an array along the first direction and the second direction to form a g-row h-column receiving antenna array, where g = 2e + 2, f = 2h - 2, and e, f, g, and h are all positive integers greater than 1.

[0018] According to some exemplary embodiments, the first predetermined angle is substantially equal to the second predetermined angle.

[0019] According to some exemplary embodiments, the first predetermined included angle is between 30° and 60°.

[0020] According to some exemplary embodiments, the at least one sub-panel includes a heart rate detection device for detecting the heart rate of the human being being detected.

[0021] In another aspect of this disclosure, a security inspection device is provided, comprising: a detection channel configured to allow an object to be inspected to pass through the security inspection device along a predetermined movement direction; a first array panel for millimeter-wave transceiver; and a second array panel for millimeter-wave transceiver, wherein the first array panel and the second array panel are respectively disposed on opposite sides of the detection channel in a direction perpendicular to the predetermined movement direction, wherein at least one of the first array panel and the second array panel is an array panel as described above.

[0022] According to some exemplary embodiments, the at least one sub-panel includes a first sub-panel, a second sub-panel, and a third sub-panel. The second sub-panel and the third sub-panel are respectively spliced ​​on opposite sides of the first sub-panel. The first sub-panel is arranged along a first arrangement direction, the second sub-panel is arranged along a second arrangement direction, and the third sub-panel is arranged along a third arrangement direction. The first arrangement direction is parallel to the predetermined movement direction. The second arrangement direction intersects the first arrangement direction at a first predetermined angle, and the third arrangement direction intersects the first arrangement direction at a second predetermined angle.

[0023] According to some exemplary embodiments, the at least one sub-panel includes a first sub-panel and a second sub-panel, the first sub-panel and the second sub-panel are spliced ​​together, the first sub-panel is arranged along a fourth arrangement direction, the second sub-panel is arranged along a fifth arrangement direction, the fourth arrangement direction intersects the predetermined movement direction at a third predetermined angle, and the fifth arrangement direction intersects the fourth arrangement direction at a fourth predetermined angle.

[0024] According to some exemplary embodiments, the first array panel and the second array panel are axially symmetrical with respect to the center plane of the detection channel.

[0025] According to some exemplary embodiments, the first array panel is a symmetrical structure with respect to a central symmetry plane, and the second array panel is a symmetrical structure with respect to a central symmetry plane, wherein the central symmetry plane is perpendicular to the predetermined movement direction.

[0026] According to some exemplary embodiments, the first sub-panel includes 2m millimeter-wave transceiver modules in the first arrangement direction, the second sub-panel includes m millimeter-wave transceiver modules in the second arrangement direction, and the third sub-panel includes m millimeter-wave transceiver modules in the third arrangement direction, where m is a positive integer greater than or equal to 1.

[0027] According to some exemplary embodiments, each of the first sub-panel, the second sub-panel, and the third sub-panel includes n millimeter-wave transceiver modules in the height direction, wherein the height direction is perpendicular to both the second arrangement direction and the first arrangement direction, and n is a positive integer greater than or equal to 2.

[0028] According to some exemplary embodiments, the first sub-panel includes 2m millimeter-wave transceiver modules in the fourth arrangement direction, and the second sub-panel includes 2m millimeter-wave transceiver modules in the fifth arrangement direction, where m is a positive integer greater than or equal to 1.

[0029] According to some exemplary embodiments, each of the first sub-panel and the second sub-panel includes n millimeter-wave transceiver modules in the height direction, wherein the height direction is perpendicular to both the fourth arrangement direction and the fifth arrangement direction, and n is a positive integer greater than or equal to 2.

[0030] According to some exemplary embodiments, each of the first array panel and the second array panel includes a heart rate detection device, the mounting height of which is configured to detect the heart rate of the human being being detected.

[0031] According to some exemplary embodiments, the mounting positions of the heart rate detection devices in the first array panel and the second array panel are axially symmetrical with respect to the center plane of the detection channel.

[0032] According to some exemplary embodiments, each of the heart rate detection devices includes a transmitting antenna and a receiving antenna, wherein the mounting positions of the transmitting antenna and the receiving antenna of the heart rate detection device in the first array panel are symmetrical with respect to the central symmetry plane, and the mounting positions of the transmitting antenna and the receiving antenna of the heart rate detection device in the second array panel are symmetrical with respect to the central symmetry plane.

[0033] In another aspect of this disclosure, a control method for the security inspection equipment as described above is provided, comprising: controlling the millimeter-wave transceiver unit to send a detection signal to the object being inspected; controlling the millimeter-wave transceiver unit to receive an echo signal from the object being inspected; and reconstructing an image of the object being inspected based on the received echo signal.

[0034] According to some exemplary embodiments, reconstructing an image of the detected object based on the received echo signal includes: selecting an image reconstruction algorithm corresponding to a different detection mode in response to different detection modes; and using the selected image reconstruction algorithm to reconstruct an image of the detected object based on the received echo signal.

[0035] According to some exemplary embodiments, the step of selecting an image reconstruction algorithm corresponding to a different detection mode in response to different detection modes specifically includes: selecting a real-time reconstruction algorithm corresponding to a fast detection mode in response to a fast detection mode; and selecting a back projection algorithm corresponding to a fine detection mode in response to a fine detection mode.

[0036] According to some exemplary embodiments, controlling the millimeter-wave transceiver unit to send a detection signal to the object being detected includes: controlling a portion of the plurality of millimeter-wave transceiver units to sequentially send a detection signal to the object being detected at a first predetermined step size; and / or, controlling the millimeter-wave transceiver unit to receive an echo signal from the object being detected includes: controlling a portion of the plurality of millimeter-wave transceiver units to sequentially receive an echo signal from the object being detected at a second predetermined step size.

[0037] According to some exemplary embodiments, the security inspection equipment has an independent operating mode and an associated operating mode, wherein a first predetermined step size in the associated operating mode is half of the first predetermined step size in the independent operating mode, and a second predetermined step size in the associated operating mode is half of the second predetermined step size in the independent operating mode.

[0038] According to some exemplary embodiments, at least one of the first array panel and the second array panel includes: a millimeter-wave transceiver modules arranged along a predetermined moving direction, and b millimeter-wave transceiver modules arranged along a height direction, wherein a and b are both positive integers greater than or equal to 2;

[0039] In the independent operating mode, the control method includes:

[0040] First independent control step: Control all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i and column j to send detection signals to the object being detected, and control all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i and column j to receive echo signals from the object being detected, where 1 ≤ i ≤ b, 1 ≤ j < a, and i and j are both positive integers; and

[0041] Increment j by 1 and repeat the first independent control step described above until j = a.

[0042] According to some exemplary embodiments, at least one of the first array panel and the second array panel includes: a millimeter-wave transceiver modules arranged along a predetermined moving direction, and b millimeter-wave transceiver modules arranged along a height direction, wherein a and b are both positive integers greater than or equal to 2;

[0043] In the independent operating mode, the control method further includes:

[0044] The second independent control step involves controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i and column j to send detection signals to the object being detected, and controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i+1 and column j to receive echo signals from the object being detected, where 1 ≤ i < b, 1 ≤ j ≤ a, and i and j are both positive integers; and

[0045] Increment i by 1 and repeat the second independent control step described above until i = b.

[0046] According to some exemplary embodiments, each millimeter-wave transceiver module includes: 2c millimeter-wave transceiver units arranged along a predetermined direction of movement, and 2d millimeter-wave transceiver units arranged along a height direction, wherein c and d are both positive integers greater than or equal to 1;

[0047] Under the aforementioned associated operating mode, the control method includes:

[0048] The first correlation control step involves controlling the millimeter-wave transceiver units located in row p, column q and row p+1, column q to send detection signals to the object being detected, and controlling the millimeter-wave transceiver units located in row p, column q, row p+1, column p+1, and column p+1 to receive echo signals from the object being detected, where 1 ≤ p ≤ 2bd, 1 ≤ q < 2ac, and p and q are both positive integers; and

[0049] Increment q by 1 and repeat the first associated control step described above until q = 2ac.

[0050] According to some exemplary embodiments, each millimeter-wave transceiver module includes: 2c millimeter-wave transceiver units arranged along a predetermined direction of movement, and 2d millimeter-wave transceiver units arranged along a height direction, wherein c and d are both positive integers greater than or equal to 1;

[0051] In the associated operating mode, the control method further includes:

[0052] The second correlation control step involves controlling the millimeter-wave transceiver units located in row p, column q and row p+1, column q to send detection signals to the object being detected, and controlling the millimeter-wave transceiver units located in row p, column q, row p+1, column p+1, and column p+1 to receive echo signals from the object being detected, where 1 ≤ p < 2bd, 1 ≤ q ≤ 2ac, and p and q are both positive integers; and

[0053] Increment p by 1 and repeat the second association control step described above until p = 2bd.

[0054] According to some exemplary embodiments, each of the first array panel and the second array panel includes a heart rate detection device, the mounting height of which is configured to detect the heart rate of the human being being detected.

[0055] The control method further includes:

[0056] Obtain the first heart rate information from the heart rate detection device in the first array panel;

[0057] Acquire the second heart rate information from the heart rate detection device in the second array panel; and

[0058] The heart rate of the human being being tested is determined based on the first heart rate information and the second heart rate information.

[0059] According to some exemplary embodiments, during heart rate detection, the human body being detected faces the first array panel and has its back to the second array panel;

[0060] Determining the heart rate of the human being being tested based on the first heart rate information and the second heart rate information includes:

[0061] The second heart rate information is scaled; and

[0062] The heart rate of the detected human body is obtained by subtracting the scaled second heart rate information from the first heart rate information.

[0063] In another aspect of this disclosure, a control method for the security inspection equipment as described above is provided, comprising:

[0064] The millimeter-wave transceiver unit is controlled to send a detection signal to the object being detected;

[0065] Controlling the millimeter-wave transceiver unit to receive echo signals from the object being detected; and

[0066] The image of the detected object is reconstructed based on the received echo signal.

[0067] According to some exemplary embodiments, the control method further includes:

[0068] Multiple control units are provided, each control unit including a transmitting antenna unit and a receiving antenna unit. In one control unit, the transmitting antenna unit includes two columns of transmitting antennas located at row s and column t and row s and column t+1. The receiving antenna unit includes four rows of receiving antennas adjacent to the column of transmitting antennas located at row s and column t in a second direction and four rows of receiving antennas adjacent to the column of transmitting antennas located at row s and column t+1 in a second direction. Where s is a positive integer and 1≤s≤e, t is an odd number and 1≤t≤f. The multiple units are arranged in an array along the first direction and the second direction to form a control unit array of row e and column f / 2.

[0069] First control step: Control the two transmitting antennas in the control unit located in row r, column o to send detection signals to the object being detected, and control the eight receiving antennas in the control unit located in row r, column o to receive the echo signals from the object being detected, where 1 ≤ r ≤ 3, 1 ≤ o ≤ f / 2, and r and o are both positive integers; and

[0070] Increment o by 1 and repeat the first control step above until o = f / 2.

[0071] According to some exemplary embodiments, the control method further includes:

[0072] The second control step involves controlling two rows of transmitting antennas in the control unit located in row r, column o to send detection signals to the object being detected, and controlling eight rows of receiving antennas in the control unit located in row r, column o to receive echo signals from the object being detected, where 1 ≤ r ≤ 3, 1 ≤ o ≤ f / 2, and r and o are both positive integers; and

[0073] Increment r by 1 and repeat the second control step above until r = e. Attached Figure Description

[0074] Figure 1 A schematic diagram of a security inspection device according to some exemplary embodiments of the present disclosure is shown.

[0075] Figure 2A and Figure 2B Schematic diagrams of the structure of a millimeter-wave transceiver unit and a schematic diagram of the equivalent phase center according to some embodiments of the present disclosure are shown respectively.

[0076] Figure 3 A schematic diagram of the structure of a millimeter-wave transceiver unit according to other embodiments of the present disclosure is shown.

[0077] Figure 4 A schematic diagram of the structure of a millimeter-wave transceiver module according to some embodiments of the present disclosure is shown.

[0078] Figures 5A to 5C These are schematic diagrams of the structure of an array panel for millimeter-wave transceiver according to some exemplary embodiments of the present disclosure.

[0079] Figure 6 This is a structural schematic diagram of a security inspection device according to some exemplary embodiments of the present disclosure.

[0080] Figure 7 yes Figure 6 A schematic top view of the security inspection equipment shown.

[0081] Figures 8A to 8D These are schematic top views of security inspection equipment, which are some other exemplary embodiments of this disclosure.

[0082] Figure 9 This is a structural schematic diagram of a security inspection device according to some exemplary embodiments of the present disclosure.

[0083] Figure 10 yes Figure 9 A schematic top view of the security inspection equipment shown.

[0084] Figures 11A to 11B These are schematic structural diagrams of security inspection equipment according to other exemplary embodiments of this disclosure.

[0085] Figure 12 This is a flowchart of a control method for a security inspection device according to some exemplary embodiments of the present disclosure.

[0086] Figure 13 A schematic diagram illustrating the working principle of a 2D MIMO millimeter-wave transceiver module according to an embodiment of the present disclosure is shown.

[0087] Figure 14 This is a flowchart of a control method for a security inspection device according to some other exemplary embodiments of the present disclosure.

[0088] Figure 15 This is a schematic diagram of a heart rate signal obtained by a security inspection device according to an embodiment of the present disclosure.

[0089] Figure 16 This is a schematic diagram of a structure in which multiple sub-panels in an array panel for millimeter-wave transceiver are unfolded into the same plane, according to some other exemplary embodiments of this disclosure. Detailed Implementation

[0090] Specific embodiments of the present invention will now be described in detail. It should be noted that the embodiments described herein are for illustrative purposes only and are not intended to limit the invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other instances, well-known structures, materials, or methods have not been specifically described to avoid obscuring the invention.

[0091] Throughout this specification, references to "some exemplary embodiments," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least some exemplary embodiments of the invention. Therefore, the phrases "in some exemplary embodiments," "in an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0092] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0093] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0094] The terms "upper," "lower," "left," and "right" used in this specification are not intended to define the absolute position of the components, but rather to describe their relative positions in the view to aid understanding. In this specification, "top side" and "bottom side" refer to the positions of the upper and lower sides relative to the normal upright position of an object. "First," "second," etc., are not used for sequencing, but rather to distinguish different parts.

[0095] It should be noted that, in the embodiments of this disclosure, when the object being detected is a human body, the face or side of the human body is the front or side of the human body, and the arm is the side of the human body.

[0096] Figure 1 Schematic diagrams of security screening devices according to some exemplary embodiments of the present disclosure are shown. For example... Figure 1 As shown, the security inspection equipment 10 includes an array panel 1 for millimeter-wave transceiver, a signal processing device 2, and a display device 3. For example, the array panel 1 can be a two-dimensional multiple-input multiple-output (2D MIMO) array panel.

[0097] The array panel 1 for millimeter-wave transceiver may include a millimeter-wave transceiver module and control circuitry. For example, the millimeter-wave transceiver module may be a 2D MIMO module. The millimeter-wave transceiver module may include at least one millimeter-wave transceiver unit, such as a 2D MIMO unit. A millimeter-wave transceiver unit may include multiple transmitting antennas and multiple receiving antennas. The midpoint of the line connecting each of the multiple transmitting antennas and a corresponding receiving antenna among the multiple receiving antennas serves as an equivalent phase center. The multiple transmitting antennas and the multiple receiving antennas are arranged such that the equivalent phase centers are arranged in a two-dimensional array. The control circuitry can control the multiple transmitting antennas to transmit detection signals in the form of electromagnetic waves to the object being detected in a preset order, and control the multiple receiving antennas to receive echo signals from the object being detected.

[0098] Signal processing device 2 can reconstruct an image of the detected object based on the echo signals received by the plurality of receiving antennas. Figure 1 In this configuration, the signal processing device 2 may include an analog signal processor 21, a digital-to-analog converter (D / A converter) 22, and a digital signal processor 23. The 2D MIMO array panel 1 sends a detection signal in microwave / millimeter-wave form to the object being detected. The echo signal generated after the detection signal reaches the object is received by the 2D MIMO array panel 1, carrying echo data corresponding to the equivalent phase center of the 2D MIMO array panel 10. The 2D MIMO array panel 1 sends the echo signal to the analog signal processor 21. The analog signal processor 21 converts the received echo signal in power signal form into an analog signal and sends it to the D / A converter 22. The D / A converter 22 converts the received analog signal into a digital signal and sends it to the digital signal processor 23. The digital signal processor 23 performs image reconstruction based on the received digital signal.

[0099] In some embodiments, the security inspection device 10 may further include a ranging device 4. The ranging device 4 may be mounted on the 2D MIMO array panel 1 and is used to measure the distance between the object being inspected and the 2D MIMO array panel 1, such as... Figure 1 As shown. The ranging device 4 can be implemented by various distance detection devices, including but not limited to ranging radar, proximity sensors, etc. When the ranging device 4 is included, the signal processing device 2 in the security inspection equipment 10 can reconstruct the image of the detected object based on the distance between the detected object and the 2D MIMO array panel 1 detected by the ranging device 4 and the echo signal received by the 2D MIMO array panel 1.

[0100] In some embodiments, the security inspection equipment 10 may further include a display device 3, which can be connected to the signal processing device 2 for displaying an image of the object being inspected reconstructed by the signal processing device 2. The display device 3 can be implemented as various devices with display functions, such as a display screen, a projector, etc.

[0101] In some embodiments, the security inspection equipment 10 may further include an alarm device connected to the signal processing device 2. In this case, the signal processing device 2 may also determine whether the object being inspected might contain a suspect based on a preset standard according to the reconstructed image of the object being inspected; if so, it controls the alarm device to sound an alarm. The alarm device can be implemented in various forms, including but not limited to devices that emit alarms through audio, vibration, and various other means, such as speakers, vibrators, and sirens. Alarm levels can also be set; for example, the signal processing device 2 can control the alarm device to sound an alarm with a low volume or weak vibration when the probability of containing a suspect is low, and control the alarm device to sound an alarm with a high volume or strong vibration when the probability of containing a suspect is high.

[0102] For example, the suspected items may include, but are not limited to, firearms, knives, explosives, drugs, and other dangerous goods.

[0103] The following will refer to Figure 2A , Figure 2B and Figure 3 The structure of the millimeter-wave transceiver unit in a 2D MIMO array panel according to embodiments of the present disclosure is described.

[0104] According to embodiments of this disclosure, a millimeter-wave transceiver unit may include multiple transmitting antennas and multiple receiving antennas arranged in an array. The transmitting and receiving antennas may be mounted on a substrate and arranged in various configurations as needed. In each millimeter-wave transceiver unit, the distance between adjacent transmitting antennas and / or adjacent receiving antennas may be an integer multiple of the wavelength of the detection signal (e.g., 1, 2, 3, 4, 5, etc.). The distance between adjacent equivalent phase centers may be half the wavelength of the detection signal. The size of the millimeter-wave transceiver unit may be determined based on the size of the imaging area to ensure accurate reconstruction of the image of the detected object.

[0105] For example, a millimeter-wave transceiver unit can include 2N transmitting antennas and 2N receiving antennas, uniformly distributed on a rectangular frame at one-wavelength intervals. When the operating frequency is fixed, the size of a millimeter-wave transceiver unit can be determined based on the tolerable error of the equivalent phase center, which is related to the imaging distance (detection distance). For instance, if the antenna spacing in a millimeter-wave transceiver unit is one wavelength, the resulting equivalent phase center will be at a spacing of half a wavelength. For example, the side length of a millimeter-wave transceiver unit can be chosen to be 5-20 centimeters.

[0106] Figure 2A and Figure 2B Schematic diagrams of the structure of a millimeter-wave transceiver unit and a schematic diagram of the equivalent phase center according to some embodiments of the present disclosure are shown respectively.

[0107] like Figure 2A As shown, the millimeter-wave transceiver unit 20 includes two rows of transmitting antennas Tx arranged horizontally and two columns of receiving antennas Rx arranged vertically, forming a rectangular pattern. Figure 2A In the figure, the size of the millimeter-wave transceiver unit 20 can be 20 cm × 20 cm, and the number of transmitting antenna Tx and receiving antenna Rx are 96 and 96 respectively. For the sake of simplicity, the number of transmitting antenna Tx and receiving antenna Rx in the figure is only for illustration and not the actual number.

[0108] like Figure 2B As shown, the equivalent positions of the transmitted and received signals can be represented by the phase center of the antenna, which is the physical center of two independent antennas or apertures. In the embodiments of this disclosure, the midpoint of the line connecting the transmitting antenna and the corresponding receiving antenna is taken as the equivalent phase center. In a MIMO architecture, one transmitting antenna Tx corresponds to multiple receiving antennas Rx. In the embodiments of this disclosure, the receiving antenna Rx and the transmitting antenna Tx are set to be in different locations. This system with spatially separated transmitting and receiving antennas can be simulated using a virtual system. In the virtual system, a virtual position is added between each set of transmitting antennas Tx and receiving antennas Rx, and this position is called the equivalent phase center. The echo data collected by the transmitting and receiving antenna combination can be equivalent to the echo collected by the self-transmitting and self-receiving antenna at the location of its equivalent phase center.

[0109] Figure 2A and Figure 2B In the millimeter-wave transceiver unit, the distance between adjacent transmitting antennas and adjacent receiving antennas is the wavelength λ of the detection signal, the distance between adjacent equivalent phase centers is λ / 2, and the sampling interval of imaging (i.e. the interval between equivalent phase centers) is on the order of λ / 2, which makes it possible to avoid artifact superposition in the reconstructed image.

[0110] Figure 3 A schematic diagram of the structure of a millimeter-wave transceiver unit according to other embodiments of the present disclosure is shown. For example... Figure 3 As shown, "*" represents the transmitting antenna, and "○" represents the receiving antenna. Figure 3 The horizontal and vertical axes in the diagram are both in meters. For example, in the E-band, with N=32, the side length of a millimeter-wave transceiver unit can be approximately 13.6 centimeters.

[0111] Figure 4A schematic diagram of a millimeter-wave transceiver module according to some embodiments of the present disclosure is shown. In the embodiments of the present disclosure, a millimeter-wave transceiver module 30 may include a plurality of millimeter-wave transceiver units 20. The size of a millimeter-wave transceiver module is related to the overall size of the array panel and the imaging area. For example, a millimeter-wave transceiver module 30 may include 2×2 millimeter-wave transceiver units, each millimeter-wave transceiver unit may be set to a size of 13.6 cm × 13.6 cm, the overall size of the millimeter-wave transceiver module 30 is 50 cm × 50 cm, and the number of transmitting antennas Tx and receiving antennas Rx are 256 and 256, respectively.

[0112] It should be noted that, Figure 4 The quantity and array arrangement shown are merely illustrative. In other embodiments of this disclosure, the quantity and array arrangement of millimeter-wave transceiver units included in a millimeter-wave transceiver module may take other forms. For example, a millimeter-wave transceiver module 30 may include 4×4 millimeter-wave transceiver units, 2×4 millimeter-wave transceiver units, etc. The embodiments of this disclosure are not intended to limit the quantity and array arrangement of millimeter-wave transceiver units.

[0113] In the embodiments of this disclosure, each millimeter-wave transceiver module 30 may include an independent data acquisition card and an image processor. That is, each millimeter-wave transceiver module 30 can be formed as an independent transceiver module, so that the array panel can be assembled in a modular manner.

[0114] For example, each millimeter-wave transceiver module 30 can be configured as a 76-81 GHz, 70-80 GHz, or 65-80 GHz chip. Thus, the millimeter-wave transceiver module according to the embodiments of this disclosure has the advantages of high integration and low cost.

[0115] Figures 5A to 5C These are schematic diagrams of the structure of an array panel for millimeter-wave transceiver according to some exemplary embodiments of the present disclosure.

[0116] Combined with reference Figures 1 to 5C In embodiments of this disclosure, the array panel 100 for millimeter-wave transceiver may include at least one sub-panel. For example, in Figure 5A In the illustrated embodiment, the array panel 100 includes a sub-panel, namely a first sub-panel 101. Figure 5B In the illustrated embodiment, the array panel 100 includes two sub-panels, namely a first sub-panel 101 and a second sub-panel 102. Figure 5C In the illustrated embodiment, the array panel 100 includes three sub-panels, namely a first sub-panel 101, a second sub-panel 102, and a third sub-panel 103.

[0117] In embodiments of this disclosure, each of the at least one sub-panel includes a plurality of millimeter-wave transceiver modules, which are arranged in an array along at least one of a first direction X and a second direction Y. For example, the first direction X and the second direction Y intersect, or the first direction X and the second direction Y may be perpendicular to each other.

[0118] For example, the first sub-panel 101 may include 4×2 millimeter-wave transceiver modules 30, that is, 4 rows and 2 columns of millimeter-wave transceiver modules 30 are arranged in the first sub-panel 101.

[0119] In embodiments of this disclosure, each millimeter-wave transceiver module 30 may include a plurality of millimeter-wave transceiver units 20, wherein in each millimeter-wave transceiver module, the plurality of millimeter-wave transceiver units 20 are arranged in an array along at least one of a first direction X and a second direction Y.

[0120] For example, each millimeter-wave transceiver module 30 may include 2×2 millimeter-wave transceiver units 20, that is, in a millimeter-wave transceiver module 30, there are 2 rows and 2 columns of millimeter-wave transceiver units 20.

[0121] As described above, each millimeter-wave transceiver unit 20 includes multiple transmitting antennas Tx and multiple receiving antennas Rx. For example, the multiple transmitting antennas Tx are arranged along a first direction X, and the multiple receiving antennas Rx are arranged along a second direction Y. The midpoint of the line connecting each of the multiple transmitting antennas and a corresponding receiving antenna among the multiple receiving antennas serves as an equivalent phase center. The multiple transmitting antennas and the multiple receiving antennas are arranged such that the equivalent phase centers are arranged in a two-dimensional array.

[0122] Reference Figure 5B The first sub-panel 101 and the second sub-panel 102 are spliced ​​together, forming a first predetermined angle α between the first sub-panel 101 and the second sub-panel 102. For example, the first predetermined angle can be between 30° and 150°, for example, between 30° and 60°, for example, about 30°.

[0123] Reference Figure 5C The second sub-panel 102 and the third sub-panel 103 are respectively spliced ​​to opposite sides of the first sub-panel 101. A first predetermined angle α is formed between the first sub-panel 101 and the second sub-panel 102, and a second predetermined angle β is formed between the first sub-panel 101 and the third sub-panel 103. For example, the first predetermined angle and the second predetermined angle are substantially equal. For example, the first predetermined angle can be between 30° and 150°, for example, between 30° and 60°, for example, about 30°.

[0124] Figure 16This is a schematic diagram of a structure in which multiple sub-panels in an array panel for millimeter-wave transceiver are unfolded into the same plane, according to some other exemplary embodiments of this disclosure.

[0125] Combined with reference Figure 7 and Figure 16 The array panel 100 for millimeter-wave transceiver may include a first sub-panel 101, a second sub-panel 102, and a third sub-panel 103. The second sub-panel 102 and the third sub-panel 103 are respectively spliced ​​on opposite sides of the first sub-panel 101. The first sub-panel 101 is arranged along a first arrangement direction D1, the second sub-panel 102 is arranged along a second arrangement direction D2, and the third sub-panel 103 is arranged along a third arrangement direction D3. The second arrangement direction D2 intersects the first arrangement direction D1 at a first predetermined angle α, and the third arrangement direction D3 intersects the first arrangement direction D1 at a second predetermined angle β.

[0126] Each of the first sub-panel 101, the second sub-panel 102, and the third sub-panel 103 includes a plurality of millimeter-wave units.

[0127] In the embodiments of this disclosure, the term "millimeter-wave unit" can be understood as: a millimeter-wave transceiver unit including a millimeter-wave transmitting antenna and a millimeter-wave receiving antenna, a millimeter-wave transmitting unit including only a millimeter-wave transmitting antenna, and a millimeter-wave receiving unit including only a millimeter-wave receiving antenna.

[0128] When both the second sub-panel and the third sub-panel are unfolded into the plane where the first sub-panel is located, as Figure 16 As shown, the millimeter-wave units included in the first sub-panel, the second sub-panel, and the third sub-panel form a millimeter-wave unit array.

[0129] It should be noted that, Figure 16 The dotted lines in the text can correspond to respectively Figure 7 The connecting lines between the first sub-panel and the second sub-panel, and between the first sub-panel and the third sub-panel.

[0130] Reference Figure 16 The millimeter-wave unit array may include: a plurality of first millimeter-wave transceiver units 20A, the plurality of first millimeter-wave transceiver units being arranged in an array along a first direction X and a second direction Y, each of the first millimeter-wave transceiver units 20A including at least two rows of receiving antennas and at least two columns of transmitting antennas, in each row of receiving antennas, a plurality of receiving antennas Rx being arranged along the first direction X; in each column of transmitting antennas, a plurality of transmitting antennas Tx being arranged along the second direction Y.

[0131] The millimeter-wave unit array may include: a plurality of second millimeter-wave transceiver units 20B, which are arranged in an array along a second direction Y. Two columns of the second millimeter-wave transceiver units 20B are respectively disposed on a first side and a second side of the array panel, wherein the first side and the second side are opposite sides of the array panel along the first direction, for example... Figure 16 The left and right sides of the middle. Each of the second millimeter-wave transceiver units 20B includes two rows of receiving antennas and one column of transmitting antennas. In each row of receiving antennas, multiple receiving antennas Rx are arranged along a first direction X; in the column of transmitting antennas, multiple transmitting antennas Tx are arranged along a second direction Y.

[0132] The millimeter-wave unit array may include: a plurality of millimeter-wave receiving antenna units 20C, which are arranged in an array along a first direction X. Two rows of the millimeter-wave receiving antenna units are respectively disposed on the third and fourth sides of the array panel, which are opposite sides of the array panel along a second direction, for example... Figure 16 The upper and lower sides of the array panel. Each millimeter-wave receiving antenna element 20C includes only one row of receiving antennas, in which multiple receiving antennas Rx are arranged along the first direction X. That is, only receiving antennas are provided on the third side (e.g., the upper side) and the fourth side (e.g., the lower side) of the array panel.

[0133] Continue to refer to Figure 16 In a row of second millimeter-wave transceiver units 20B located on the first side (e.g., the left side) of the array panel, a column of transmitting antennas for each second millimeter-wave transceiver unit 20B is arranged on the side of the row of second millimeter-wave transceiver units 20B closest to the first millimeter-wave transceiver unit 20A. That is, in a row of second millimeter-wave transceiver units 20B located on the first side (e.g., the left side) of the array panel, the column of transmitting antennas close to the first side is missing, and a column of transmitting antennas is only arranged at a position away from the first side.

[0134] In a row of second millimeter-wave transceiver units 20B located on the second side (e.g., the right side) of the array panel, a column of transmitting antennas for each second millimeter-wave transceiver unit 20B is arranged on the side of the row of second millimeter-wave transceiver units 20B closest to the first millimeter-wave transceiver unit 20A. That is, in a row of second millimeter-wave transceiver units 20B located on the second side (e.g., the left side) of the array panel, a column of transmitting antennas close to the second side is missing, and a column of transmitting antennas is only arranged at a position away from the second side.

[0135] For example, the number of second millimeter-wave transceiver units in a second millimeter-wave transceiver unit 20B is equal to the number of first millimeter-wave transceiver units in a first millimeter-wave transceiver unit 20A. For example, in Figure 16In the example shown, a column of second millimeter-wave transceiver units 20B includes 7 second millimeter-wave transceiver units, and a column of first millimeter-wave transceiver units 20A also includes 7 first millimeter-wave transceiver units.

[0136] For example, the number of millimeter-wave receiving antenna elements in a row of millimeter-wave receiving antenna elements 20C is equal to the sum of the number of the first millimeter-wave transceiver element 20A and the second millimeter-wave transceiver element 20B located in the same row. For example, in Figure 16 In the example shown, a row of millimeter-wave receiving antenna units 20C includes 8 millimeter-wave receiving antenna units. In the same row, there are 6 first millimeter-wave transceiver units 20A and 2 second millimeter-wave transceiver units 20B.

[0137] In embodiments of this disclosure, in the millimeter-wave unit array, multiple rows of transmitting antennas are arranged in an array along a first direction X and a second direction Y, forming an e-row, f-column transmitting antenna array; multiple rows of receiving antennas are arranged in an array along the first direction X and the second direction Y, forming a g-row, h-column receiving antenna array, where g = 2e + 2, f = 2h - 2, and e, f, g, and h are all positive integers greater than 1. For example, in Figure 16 In the example shown, a 7-row, 14-column transmit antenna array is formed, and a 16-row, 8-column receive antenna array is formed.

[0138] In the embodiments of this disclosure, various forms of array panels can be formed by combining multiple millimeter-wave transceiver modules. That is, the array panel can adopt a fully modular design, which is conducive to the rapid formation of different forms of array panels, thereby expanding the application scenarios of the array panel.

[0139] In the embodiments of this disclosure, the millimeter-wave transceiver modules can be arranged at an angle to achieve multi-view detection. In this way, when reconstructing the image, multi-angle fusion of the image can be achieved, which is beneficial to improving the accuracy of imaging.

[0140] Optionally, the array panel 100 may further include a heart rate detection device 40 for detecting the heart rate of the human being being detected.

[0141] Figure 6 This is a structural schematic diagram of a security inspection device according to some exemplary embodiments of the present disclosure. Figure 7 yes Figure 6 A schematic top view of the security inspection equipment shown. Figures 8A to 8D These are schematic top views of security inspection equipment, which are some other exemplary embodiments of this disclosure.

[0142] Combined with reference Figures 1 to 8DIn embodiments of this disclosure, the security inspection device 10 may include: a detection channel D configured to allow an object OB to pass through the security inspection device along a predetermined movement direction MD; a first array panel 100A for millimeter-wave transceiver; and a second array panel 100B for millimeter-wave transceiver, wherein the first array panel 100A and the second array panel 100B are respectively disposed on opposite sides of the detection channel D in a direction perpendicular to the predetermined movement direction, wherein at least one of the first array panel 100A and the second array panel 100B is the array panel 100 proposed in the above embodiments.

[0143] For example, in Figures 7 to 8D In the top view shown, the predetermined movement direction MD is the horizontal direction, and the direction perpendicular to the predetermined movement direction is the vertical direction.

[0144] For example, each of the first array panel 100A and the second array panel 100B is an array panel 100 provided in any of the above embodiments.

[0145] Reference Figure 6 , Figure 7 , Figure 8A , Figure 8B In each of the first array panel 100A and the second array panel 100B, the at least one sub-panel includes a first sub-panel 101, a second sub-panel 102, and a third sub-panel 103. The second sub-panel 102 and the third sub-panel 103 are respectively spliced ​​on opposite sides of the first sub-panel 101. The first sub-panel 101 is arranged along a first arrangement direction D1, the second sub-panel 102 is arranged along a second arrangement direction D2, and the third sub-panel 103 is arranged along a third arrangement direction D3. That is, each array panel includes three sub-panels, and two adjacent sub-panels are arranged at a certain angle.

[0146] For example, the first arrangement direction D1 is parallel to the predetermined movement direction MD, the second arrangement direction D2 intersects the first arrangement direction D1 at a first predetermined angle α, and the third arrangement direction D3 intersects the first arrangement direction D1 at a second predetermined angle β.

[0147] For example, the first predetermined angle is substantially equal to the second predetermined angle. For example, the first predetermined angle can be between 30° and 150°, for example, between 30° and 60°, such as approximately 30°, 45°, 60°, etc.

[0148] Reference Figure 8C and Figure 8DThe at least one sub-panel includes a first sub-panel 101 and a second sub-panel 102, which are joined together. The first sub-panel 101 is arranged along a fourth arrangement direction D4, and the second sub-panel 102 is arranged along a fifth arrangement direction D5. The fourth arrangement direction D4 intersects the predetermined movement direction MD at a third predetermined angle γ, and the fifth arrangement direction D5 intersects the fourth arrangement direction D4 at a fourth predetermined angle θ. That is, each array panel includes two sub-panels arranged at a certain angle. For example, the third predetermined angle γ can be between 30° and 60°, such as approximately 30°, 45°, 60°, etc. The fourth predetermined angle θ can be between 90° and 150°, such as approximately 120°, 135°, 150°, etc.

[0149] In the embodiments of this disclosure, the millimeter-wave transceiver modules can be arranged at an angle to achieve multi-view detection. In this way, when reconstructing the image, multi-angle fusion of the image can be achieved, which is beneficial to improving the accuracy of imaging.

[0150] For example, the detection channel D has a center plane DT, such as Figure 7 As shown by the horizontal dotted line in the diagram. The first array panel 100A and the second array panel 100B are axially symmetrical with respect to the center plane DT of the detection channel.

[0151] Reference Figure 7 The detection channel D can have an inlet DI and an outlet DO. The width of the inlet DI and the outlet DO (i.e., along...) Figure 7 The vertical dimensions (in the middle) can be substantially equal. For example, the widths of the inlet DI and outlet DO can be between 40 and 100 cm. The center plane DT of the detection channel D can bisect the width of the inlet DI, that is, in Figure 7 In the embodiment shown, the widths of the inlet DI on both sides of the center plane DT of the detection channel D are each half the width of the inlet DI.

[0152] Reference Figure 7 The first array panel 100A is a symmetrical structure with respect to a central symmetry plane, and the second array panel 100B is a symmetrical structure with respect to a central symmetry plane ST (e.g., ...). Figure 7 The symmetrical structure (shown by the vertical dotted line in the middle) has a central symmetry plane ST perpendicular to the predetermined movement direction MD.

[0153] For example, in Figure 6In the illustrated embodiment, the first sub-panel 101 includes 2m millimeter-wave transceiver modules in the first arrangement direction D1, the second sub-panel 102 includes m millimeter-wave transceiver modules in the second arrangement direction D2, and the third sub-panel 103 includes m millimeter-wave transceiver modules in the third arrangement direction D3, where m is a positive integer greater than or equal to 1. Each of the first sub-panel 101, the second sub-panel 102, and the third sub-panel 103 includes n millimeter-wave transceiver modules in the height direction HD, where the height direction HD is perpendicular to both the second arrangement direction D2 and the first arrangement direction D1, and n is a positive integer greater than or equal to 2. For example, m=1, n=4.

[0154] In other words, in the first sub-panel 101, multiple millimeter-wave transceiver modules 30 are arranged in an array of n rows and 2m columns, for example, in a 4×2 array. In the second sub-panel 102, multiple millimeter-wave transceiver modules 30 are arranged in an array of n rows and m columns, for example, in a 4×1 array. In the third sub-panel 103, multiple millimeter-wave transceiver modules 30 are arranged in an array of n rows and m columns, for example, in a 4×1 array. Thus, in the first array panel 100A, multiple millimeter-wave transceiver modules 30 are arranged in a 4×4 array.

[0155] For example, in Figure 8A and Figure 8B In the illustrated embodiment, the first sub-panel 101 includes m millimeter-wave transceiver modules in the first arrangement direction D1, the second sub-panel 102 includes m millimeter-wave transceiver modules in the second arrangement direction D2, and the third sub-panel 103 includes m millimeter-wave transceiver modules in the third arrangement direction D3, where m is a positive integer greater than or equal to 1. Each of the first sub-panel 101, the second sub-panel 102, and the third sub-panel 103 includes n millimeter-wave transceiver modules in the height direction HD, where the height direction HD is perpendicular to both the second arrangement direction D2 and the first arrangement direction D1, and n is a positive integer greater than or equal to 2.

[0156] In other words, in the first sub-panel 101, multiple millimeter-wave transceiver modules 30 are arranged in an array of n rows and m columns. In the second sub-panel 102, multiple millimeter-wave transceiver modules 30 are arranged in an array of n rows and m columns. In the third sub-panel 103, multiple millimeter-wave transceiver modules 30 are arranged in an array of n rows and m columns.

[0157] For example, in Figure 8C and Figure 8DIn the illustrated embodiment, the first sub-panel 101 includes 2m millimeter-wave transceiver modules in the fourth arrangement direction D4, and the second sub-panel 102 includes 2m millimeter-wave transceiver modules in the fifth arrangement direction D5, where m is a positive integer greater than or equal to 1. Each of the first sub-panel 101 and the second sub-panel 102 includes n millimeter-wave transceiver modules in the height direction HD, where n is a positive integer greater than or equal to 2.

[0158] In other words, in the first sub-panel 101, multiple millimeter-wave transceiver modules 30 are arranged in an array of 2n rows and 2m columns. In the second sub-panel 102, multiple millimeter-wave transceiver modules 30 are arranged in an array of 2n rows and 2m columns.

[0159] Optionally, each of the first array panel 100A and the second array panel 100B includes a heart rate detection device 40, the mounting height of which is configured to detect the heart rate of the human being being tested.

[0160] For example, the mounting positions of the heart rate detection device 40 in the first array panel 100A and the heart rate detection device 40 in the second array panel 100B are axially symmetrical with respect to the center plane DT of the detection channel.

[0161] Reference Figure 5C , Figure 8B and Figure 8D Each of the heart rate detection devices 40 includes a transmitting antenna 40T and a receiving antenna 40R. For example, the transmitting antenna 40T and the receiving antenna 40R of the heart rate detection device in the first array panel 100A are symmetrical with respect to the central symmetry plane ST, and the transmitting antenna 40T and the receiving antenna 40R of the heart rate detection device in the second array panel 100B are symmetrical with respect to the central symmetry plane ST.

[0162] Figure 9 This is a structural schematic diagram of a security inspection device according to some exemplary embodiments of the present disclosure. Figure 10 yes Figure 9 A schematic top view of the security inspection equipment shown. Figures 11A to 11B These are schematic structural diagrams of security inspection equipment according to other exemplary embodiments of this disclosure.

[0163] Combined with reference Figures 9 to 11BIn embodiments of this disclosure, in the security inspection equipment, at least one of the first array panel 100A and the second array panel 100B may include at least one sub-panel and at least one reflector for reflecting millimeter waves. For example, the at least one sub-panel may include a first sub-panel 101, and the at least one reflector may include a first reflector 201. For example, the surface of the reflector facing the object OB to be inspected may be a smooth metal surface; however, embodiments of this disclosure are not limited to this, as long as the reflectivity of the reflector reaches 90% or more.

[0164] In this embodiment, one or two reflectors are added to the side of the array panel to increase the millimeter wave illumination area without increasing the number of transceiver antennas, which can effectively solve the problem of poor imaging effect on the side of the human body.

[0165] In embodiments of this disclosure, the first reflector 201 is fixedly connected to or rotatably connected to the first sub-panel 101.

[0166] Reference Figure 9 and Figure 10 The first sub-panel 101 is arranged along a first arrangement direction D1, which is parallel to the predetermined movement direction MD. The first reflector 201 is arranged along a second arrangement direction D2, which intersects the first arrangement direction D1 at a first predetermined angle α. For example, the first predetermined angle α can be between 90° and 150°, such as approximately 100°, 120°, 145°, etc.

[0167] For example, in the first array panel 100A, the first reflector 201 is arranged upstream of the first sub-panel 101 along the predetermined moving direction MD. In the second array panel 100B, the first reflector 201 is arranged downstream of the first sub-panel 101 along the predetermined moving direction MD. That is, the first reflectors 201 of the two array panels are arranged opposite to the object being detected OB, which helps to reflect more rays onto the object being detected, thereby improving the imaging effect. In particular, the first reflectors 201 of the two array panels are arranged opposite to the body side of the object being detected OB, which can effectively solve the problem of poor imaging effect on the body side of the human body.

[0168] Reference Figure 11A and Figure 11B The reflector may include: a first reflector 201 for reflecting millimeter waves; and a second reflector 202 for reflecting millimeter waves.

[0169] In each of the first array panel 100A and the second array panel 100B, the first reflector 201 and the second reflector 202 are respectively fixedly connected (e.g., ...). Figure 11A (as shown) or rotatable connection (such as Figure 11B As shown, on the opposite side of the first sub-panel 101, the first sub-panel 101 is arranged along a first arrangement direction D1, the first reflector 201 is arranged along a second arrangement direction D2, and the second reflector 202 is arranged along a third arrangement direction D3. The first arrangement direction D1 is parallel to the predetermined movement direction MD. The second arrangement direction D2 intersects the first arrangement direction D1 at a first predetermined angle α, and the third arrangement direction D3 intersects the first arrangement direction D1 at a second predetermined angle β.

[0170] exist Figure 11A In the illustrated embodiment, the first reflector 201 and the second reflector 202 are respectively fixedly connected to opposite sides of the first sub-panel 101, and the first predetermined angle α and the second predetermined angle β can be substantially equal. For example, the first predetermined angle α can be between 30° and 150°, for example, between 30° and 60°, for example, about 30°.

[0171] exist Figure 11B In the illustrated embodiment, the first reflector 201 and the second reflector 202 are rotatably connected to opposite sides of the first sub-panel 101. For example, the first reflector 201 and the second reflector 202 are rotatably connected to opposite sides of the first sub-panel 101 via a pivot 203. In this case, the first predetermined angle α and the second predetermined angle β can be adjusted as needed. For example, the adjustment range of the first predetermined angle α and the second predetermined angle β can be between 30° and 150°, for example, between 30° and 60°.

[0172] For example, the width of the first reflector 201 along the second arrangement direction D2 is between 0.5 and 0.7 times the width of the first sub-panel 101 along the first arrangement direction D1. The height of the first reflector 101 along the height direction HD is substantially equal to the height of the first sub-panel 101 along the height direction HD.

[0173] For example, the width of the second reflector 202 along the third arrangement direction D3 is between 0.5 and 0.7 times the width of the first sub-panel 101 along the first arrangement direction D1. The height of the second reflector 202 along the height direction HD is substantially equal to the height of the first sub-panel 101 along the height direction HD.

[0174] Figure 12 This is a flowchart of a control method for a security inspection device according to some exemplary embodiments of this disclosure. For example... Figure 12As shown, the control method of the security inspection equipment according to an exemplary embodiment of the present disclosure may include operations S310 to S330. The control method of the security inspection equipment may be executed by a processor or by any control device including a processor.

[0175] In operation S310, the millimeter-wave transceiver unit 20 is controlled to send a detection signal to the object being detected.

[0176] In operation S320, the millimeter-wave transceiver unit 20 is controlled to receive the echo signal from the object being detected.

[0177] In operation S330, an image of the detected object is reconstructed based on the received echo signal.

[0178] In embodiments of this disclosure, reconstructing an image of the detected object based on the received echo signal may include: selecting an image reconstruction algorithm corresponding to a different detection mode in response to different detection modes; and using the selected image reconstruction algorithm to reconstruct an image of the detected object based on the received echo signal.

[0179] For example, the step of selecting an image reconstruction algorithm corresponding to a different detection mode in response to different detection modes specifically includes: selecting a real-time reconstruction algorithm corresponding to a fast detection mode in response to a fast detection mode; and selecting a back projection algorithm corresponding to a fine detection mode in response to a fine detection mode.

[0180] For example, the rapid detection mode can be applied to scenarios with high real-time requirements, such as subway stations. In rapid detection mode, the person being inspected passes through the detection channel at a normal walking speed, such as... Figure 8A , Figure 8C As shown, the person being inspected basically does not linger in the inspection channel, passing through it at a normal walking speed. In the fast inspection mode, a real-time reconstruction algorithm can be used to reconstruct the image.

[0181] For example, the refined inspection mode can be applied to scenarios with high security requirements, such as airport security. In the refined inspection mode, the person being inspected can be required to stand still for 2-3 seconds, or be required to turn around, such as... Figure 7 , Figure 8B , Figure 8D As shown. In the fine-tuning mode, a back projection algorithm can be used to reconstruct the image.

[0182] In the embodiments of this disclosure, the security inspection equipment can flexibly select the security inspection mode according to different application scenarios, which can expand the application scenarios of the security inspection equipment while ensuring the imaging effect.

[0183] Those skilled in the art should understand that the above is merely an example, and the structure of the 2D MIMO millimeter-wave transceiver module 11 disclosed herein is not limited thereto. The size of the subarray, the size of the array, the arrangement of the antennas in the subarray, and the number of antennas can be adjusted as needed.

[0184] Figure 13 A schematic diagram illustrating the operating principle of a 2D MIMO millimeter-wave transceiver module according to an embodiment of the present disclosure is shown. Figure 13 As shown, a 2D MIMO millimeter-wave transceiver module comprising 4×4 millimeter-wave transceiver units is described as an example, wherein each millimeter-wave transceiver unit has the following characteristics: Figure 3 The structure shown forms an array of equivalent phase centers (also called an equivalent phase center network), (n x , n y The coordinates of the equivalent phase center in the array (equivalent phase center grid) are represented by ). The center reference point of the imaging region 103 of this 2D MIMO millimeter-wave transceiver module is determined by . This indicates that the detected objects include those located at the central reference point. Point scatterer at the location. During security checks, the aforementioned 2D MIMO millimeter-wave transceiver module can be controlled using electronic scanning.

[0185] As an example, the control circuit can control the transmitting antennas in each millimeter-wave transceiver unit of the 2D MIMO millimeter-wave transceiver module to sequentially transmit detection signals, and the receiving antennas to receive echo signals. Then, it switches to the next millimeter-wave transceiver unit, repeating this operation until the entire millimeter-wave transceiver module is scanned, obtaining all scattering data from different viewpoints of the detected object. As another example, the control circuit can control all transmitting antennas in the 2D MIMO millimeter-wave transceiver module to sequentially transmit detection signals and control all receiving antennas in the 2D MIMO millimeter-wave transceiver module to receive echo signals.

[0186] In the embodiments of this disclosure, microwave and millimeter waves with frequencies in the 10-300 GHz range are used as detection signals. Waves in this band do not cause ionizing damage to the human body and can be used for human body security checks. In the embodiments of this disclosure, the 2D MIMO millimeter-wave transceiver module includes multiple transmitting antennas and multiple receiving antennas arranged in a two-dimensional array. It operates using electronic scanning, which has the advantage of high detection speed. Combined with a three-dimensional holographic algorithm based on Fast Fourier Transform (FFT), real-time imaging can be achieved. One transmitting antenna and one corresponding receiving antenna in the 2D MIMO millimeter-wave transceiver module can generate an equivalent phase center. The echo data collected by a pair of transmitting and receiving antennas can be equivalent to the echo collected by a self-transmitting and self-receiving antenna at the location of its equivalent phase center. The equivalent phase centers are arranged in an array, and the interval between adjacent equivalent phase centers is basically half the wavelength λ of the detection signal. This makes the entire equivalent phase center array basically a full array, and the sampling interval (i.e. the interval between equivalent phase centers) used by the imaging system is on the order of λ / 2. As a result, there are no artifacts superimposed in the generated image, and a clearer image can be formed, which improves the speed of image processing.

[0187] For example, in fast detection mode, a real-time reconstruction algorithm, such as a holographic reconstruction algorithm, can be selected to reconstruct the image of the detected object. This real-time reconstruction algorithm can be combined with a synthetic aperture holography algorithm based on fast Fourier transform, thus achieving rapid reconstruction and completing the imaging process.

[0188] Holographic reconstruction algorithms can achieve real-time reconstruction of images of the detected object. The echo data acquired by a pair of transmit / receive antennas can be equivalent to the echo acquired by a self-transmitting and self-receiving antenna at the location of its equivalent phase center. The signal processing device acquires the echo data at the equivalent phase center; assuming the acquired reflection data of the detected object is s(n)... x , n y The reflection data is corrected using the following formula to obtain the corrected reflection data matrix:

[0189] ,

[0190] in For the uncorrected scattering data matrix, n x and n y It is the position of the equivalent phase center in the equivalent phase center network (i.e., the index of the row and column).

[0191] and The calculation formula is as follows:

[0192] ;and

[0193] .

[0194] in, The reference point represents the center of the imaging region, j represents the imaginary number, and k represents the spatial constant.

[0195] This represents the calculated reflection set, in which case the object being detected is sampled, and the object being detected contains a location located at... Point scatterer at that location.

[0196] This represents the calculated reflection set, which is obtained by sampling the equivalent phase center network of the multi-receiver, multi-transmitter aperture.

[0197] Then, the scattering coefficients of the detected object are reconstructed using a two-dimensional Fourier transform algorithm:

[0198]

[0199] Where I(x, y) represents the scattering coefficient of the object being detected, z0 represents the distance between the 2D MIMO array panel and the object being detected, j represents the imaginary number, and k is the propagation constant. x k y These are the spatial propagation constant and the FFT. 2D For two-dimensional Fourier transform, IFFT 2D This is a two-dimensional inverse Fourier transform.

[0200] After completing the two-dimensional aperture scan, the acquired echo data can be represented as follows: Finally, by combining a synthetic aperture holography algorithm based on Fast Fourier Transform (FFT), rapid reconstruction and imaging can be achieved. The purpose of the imaging algorithm is to deduce the image of the detected object from the echo expression, i.e., the scattering coefficient I(x, y) of the detected object. The FFT-based synthetic aperture holography algorithm does not require point-by-point reconstruction of the entire imaging area; instead, it utilizes the advantages of FFT to reconstruct the correct imaging area in one step. Therefore, this algorithm enables rapid scanning and rapid image reconstruction, thus achieving real-time imaging. The reconstructed image is displayed on a display device, and combined with a suspicious object alarm algorithm, an alarm is triggered for suspicious objects.

[0201] For example, in the fine detection mode, a back projection algorithm can be selected to reconstruct the image of the detected object.

[0202] Back projection, originating from computed tomography (CT) technology, is a precise imaging algorithm based on time-domain signal processing. Its basic idea is to calculate the delay between each imaging point and the transmitting and receiving antennas within the imaging region, and then coherently superimpose the contributions of all echoes to obtain the corresponding pixel value in the image. By performing this coherent superposition process point-by-point across the entire imaging region, the image of the region can be obtained. The back projection algorithm is inherently easy to implement in parallel computation, making it suitable for situations where multiple receiving antennas in multiple units simultaneously receive reflected electromagnetic waves. Although it requires reconstruction of every point in the entire imaging range, if the hardware in the processing system uses GPU or FPGA technology, the reconstruction time can be significantly reduced, even achieving real-time reconstruction.

[0203] The reconstruction formula can be expressed as follows:

[0204]

[0205] in, It is the scattering coefficient of the object being tested, z a This represents the imaging distance, where j is the imaginary unit and k is the propagation constant. For a pair of transmitting and receiving antennas to receive the echo signal from the object under test, (x t , y t (x) represents the coordinates of the transmitting antenna. r , y r ) represents the coordinates of the receiving antenna, and z represents the distance between the 2D MIMO array panel and a certain section of the object under test.

[0206] After step S330, other steps can be performed, such as analyzing the reconstructed image of the detected object to determine whether the detected object may carry a suspect. If so, the alarm device is controlled to sound an alarm. For example, the reconstructed image of the detected object can be compared with a pre-stored template. If the degree of matching with the feature template of a certain suspect is greater than a preset threshold, it is determined that the object may contain that suspect; otherwise, it is determined that the object does not contain a suspect. In some embodiments, the probability of containing a suspect can also be determined based on the degree of matching. For example, a higher degree of matching indicates a higher probability of containing a suspect, and a lower degree of matching indicates a lower probability of containing a suspect. Alarm methods include, but are not limited to, screen display, audio alarm, vibration alarm, etc. Alarm levels can also be set. For example, when the probability of containing a suspect is low, an alarm can be triggered by a low-volume sound or weak vibration; when the probability of containing a suspect is high, an alarm can be triggered by a high-volume sound or strong vibration.

[0207] Furthermore, the reconstructed image of the detected object and / or the aforementioned judgment results can be presented to the user via a display device. For example, the reconstructed image can be displayed on a screen after reconstruction, and then the analysis results can be presented on the screen; alternatively, the reconstructed image and judgment results can be presented on the screen together after image reconstruction and analysis comparison are completed. The presentation method of the judgment results (e.g., what kind of suspect may be present, and the probability of containing that suspect) can be selected as needed. In addition to presenting it on the screen in the form of a picture, it can also be presented using other methods such as audio and vibration. For example, the judgment results can be played in the form of voice, or the alarm volume or vibration intensity of the alarm can be used to indicate the judgment results. For example, a high-volume alarm indicates a higher probability of containing a suspect, while a low-volume alarm indicates a lower probability of containing a suspect.

[0208] In embodiments of this disclosure, controlling the millimeter-wave transceiver unit to send a detection signal to the object being detected includes: controlling a portion of the plurality of millimeter-wave transceiver units to sequentially send detection signals to the object being detected at a first predetermined step size.

[0209] The control of the millimeter-wave transceiver unit to receive the echo signal from the object being detected includes: controlling a portion of the plurality of millimeter-wave transceiver units to sequentially receive the echo signal from the object being detected at a second predetermined step size.

[0210] In the embodiments of this disclosure, the security inspection equipment has an independent working mode and an associated working mode. The first predetermined step size in the associated working mode is half of the first predetermined step size in the independent working mode, and the second predetermined step size in the associated working mode is half of the second predetermined step size in the independent working mode.

[0211] Combined with reference Figure 5C , Figure 6 At least one of the first array panel 100A and the second array panel 100B includes: a millimeter-wave transceiver modules arranged along a predetermined direction of movement, and b millimeter-wave transceiver modules arranged along a height direction. For example, a=4m, b=n. That is, in each of the first array panel 100A and the second array panel 100B, the plurality of millimeter-wave transceiver modules 30 are arranged in an array of n rows and 4m columns. For example, m=1, n=4.

[0212] In the independent operating mode, each millimeter-wave transceiver module 30 operates independently of each other.

[0213] For example, in the independent operating mode, the control method may include: a first independent control step: controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in the i-th row and j-th column to send a detection signal to the object being detected, and controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in the i-th row and j-th column to receive the echo signal from the object being detected, where 1≤i≤b, 1≤j<a, and i and j are both positive integers; then, incrementing j by 1, and repeatedly executing the above first independent control step until j=a.

[0214] For example, in the independent operating mode, the control method may include: a second independent control step: controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in the i-th row and j-th column to send detection signals to the object being detected, and controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in the i-th row and j-th column to receive echo signals from the object being detected, where 1≤i<b, 1≤j≤a, and i and j are both positive integers; then, incrementing i by 1, and repeatedly executing the above second independent control step until i=b.

[0215] Combined with reference Figure 5A , Figure 6 In the independent operating mode, all millimeter-wave transceiver units 20 (e.g., four millimeter-wave transceiver units 20) in the millimeter-wave transceiver module 30 located in the first row and first column (e.g., one millimeter-wave transceiver module 30 located in the upper left corner) are controlled to send detection signals to the object being detected. Correspondingly, all millimeter-wave transceiver units 20 in the millimeter-wave transceiver module 30 located in the first row and first column are controlled to receive echo signals from the object being detected. Then, j is incremented by 1, that is, all millimeter-wave transceiver units 20 (e.g., four millimeter-wave transceiver units 20) in the millimeter-wave transceiver module 30 located in the first row and second column are controlled to send detection signals to the object being detected. Correspondingly, all millimeter-wave transceiver units 20 in the millimeter-wave transceiver module 30 located in the first row and second column are controlled to receive echo signals from the object being detected. For the millimeter-wave transceiver modules in the first row, the first independent control step is executed sequentially until the last millimeter-wave transceiver module 30 in the first row is reached. In other words, in the independent operating mode, the MD moves one millimeter-wave transceiver module at a time along the specified moving direction.

[0216] After all millimeter-wave transceiver modules 30 in the first row have completed their scans, a further scan can be performed along the height direction (HD).

[0217] For example, in the independent operating mode, all millimeter-wave transceiver units 20 (e.g., four millimeter-wave transceiver units 20) in the millimeter-wave transceiver module 30 located in the second row and first column are controlled to send detection signals to the object being detected. Correspondingly, all millimeter-wave transceiver units 20 in the second row and first column are controlled to receive echo signals from the object being detected. Then, j is incremented by 1, that is, all millimeter-wave transceiver units 20 (e.g., four millimeter-wave transceiver units 20) in the millimeter-wave transceiver module 30 located in the second row and second column are controlled to send detection signals to the object being detected. Correspondingly, all millimeter-wave transceiver units 20 in the millimeter-wave transceiver module 30 located in the second row and second column are controlled to receive echo signals from the object being detected. For the millimeter-wave transceiver modules in the second row, the first independent control step is executed sequentially until the last millimeter-wave transceiver module 30 in the second row is reached. That is, in the independent operating mode, one millimeter-wave transceiver module is stepped up each time along the height direction HD.

[0218] In other words, in the independent operating mode, for each row of millimeter-wave transceiver modules 30, the millimeter-wave transceiver modules 30 are controlled one by one along a predetermined movement direction with a step size of one millimeter-wave transceiver module. After scanning one row of millimeter-wave transceiver modules 30, the next row of millimeter-wave transceiver modules 30 is controlled along the height direction with a step size of one millimeter-wave transceiver module. For the next row of millimeter-wave transceiver modules 30, the millimeter-wave transceiver modules 30 are controlled one by one along a predetermined movement direction with a step size of one millimeter-wave transceiver module, and so on, until the last row and the last millimeter-wave transceiver module 30 are scanned. In this way, a complete scan is completed. Then, the image of the detected object can be reconstructed based on the echo signals received during a complete scan.

[0219] In the associated working mode, each millimeter-wave transceiver module 30 works in association with each other.

[0220] For example, each millimeter-wave transceiver module includes: 2c millimeter-wave transceiver units arranged along a predetermined direction of movement, and 2d millimeter-wave transceiver units arranged along the height direction. (For...) Figure 5C , Figure 6 In the example shown, c=1, d=1.

[0221] Under the aforementioned associated working mode, the control method may include: a first associated control step: controlling the millimeter-wave transceiver units located in row p, column q and row p+1, column q to send detection signals to the object being detected, and controlling the millimeter-wave transceiver units located in row p, column q, row p+1, column p+1, and column p+1, column p+1 to receive echo signals from the object being detected, wherein 1≤p≤2bd, 1≤q<2ac, and p and q are both positive integers; then, incrementing q by 1, and repeatedly executing the above first associated control step until q=2ac.

[0222] Under the aforementioned associated working mode, the control method may include: a second associated control step: controlling the millimeter-wave transceiver units located in row p, column q and row p+1, column q to send detection signals to the object being detected, and controlling the millimeter-wave transceiver units located in row p, column q, row p+1, column p+1, and column p+1, column p+1 to receive echo signals from the object being detected, wherein 1 ≤ p < 2bd, 1 ≤ q ≤ 2ac, and p and q are both positive integers; then, incrementing p by 1, and repeatedly executing the above second associated control step until p = 2bd.

[0223] Combined with reference Figure 5C , Figure 6 In the associated operating mode, the millimeter-wave transceiver units 20 located in the first row and first column and the second row and first column (e.g., the two millimeter-wave transceiver units 20 located in the upper left corner) are controlled to send detection signals to the object being detected. Correspondingly, the four millimeter-wave transceiver units 20 located in the first row and first column, the second row and first column, the second row and first column, and the second row and second column (i.e., the four millimeter-wave transceiver units of the millimeter-wave transceiver module located in the upper left corner) are controlled to receive echo signals from the object being detected. Then, q is increased by 1, that is, the millimeter-wave transceiver units 20 located in the first row and second column and the second row and second column (e.g., the two millimeter-wave transceiver units 20) are controlled to send detection signals to the object being detected. Correspondingly, the four millimeter-wave transceiver units 20 located in the first row and second column, the second row and second column, the first row and third column, and the second row and third column are controlled to receive echo signals from the object being detected. For the millimeter-wave transceiver modules in the first row, the first association control step is executed sequentially until the last millimeter-wave transceiver module 30 in the first row is reached. That is, in the association working mode, the module moves half a millimeter-wave transceiver module each time along the specified movement direction MD.

[0224] After all the millimeter-wave transceiver units 20 in all the millimeter-wave transceiver modules 30 in the first row have completed the scan, they can be further scanned along the height direction HD.

[0225] For example, in the associated operating mode, the millimeter-wave transceiver units 20 located in the 2nd row, 1st column and the 3rd row, 1st column (e.g., two millimeter-wave transceiver units 20) are controlled to send detection signals to the object being detected. Correspondingly, the four millimeter-wave transceiver units 20 located in the 2nd row, 1st column, 3rd row, 2nd column, and 3rd row, 2nd column are controlled to receive echo signals from the object being detected. Then, q is increased by 1, that is, the millimeter-wave transceiver units 20 located in the 2nd row, 2nd column and the 3rd row, 2nd column (e.g., two millimeter-wave transceiver units 20) are controlled to send detection signals to the object being detected. Correspondingly, the four millimeter-wave transceiver units 20 located in the 2nd row, 2nd column, 3rd row, 2nd column, and 3rd row, 3rd column are controlled to receive echo signals from the object being detected. In other words, in the associated operating mode, the millimeter-wave transceiver module is moved half a step along the predetermined movement direction MD each time.

[0226] In other words, under the aforementioned associated operating mode, for each row of millimeter-wave transceiver modules 30, half of the millimeter-wave transceiver units 20 within the millimeter-wave transceiver module 30 is controlled to transmit millimeter waves along a predetermined movement direction with a step size of half a millimeter-wave transceiver module, and the half of the millimeter-wave transceiver unit 20 and its adjacent half of the millimeter-wave transceiver unit 20 are controlled to receive echoes. After a row of millimeter-wave transceiver modules 30 is scanned, it moves along the height direction with a step size of half a millimeter-wave transceiver module to scan the next row. This process continues until the scan of the last half of the millimeter-wave transceiver units 20 in the last row of millimeter-wave transceiver modules 30 is completed. In this way, a complete scan is completed, and then the image of the detected object can be reconstructed based on the echo signals received during a complete scan.

[0227] In the associated working mode, scanning is performed one by one in steps of half a millimeter-wave transceiver module, which can increase the amount of data without increasing the number of transceiver antennas, thereby improving the imaging effect.

[0228] Combined with reference Figure 5C and Figure 6The splicing line 101S of the first sub-panel 101 and the second sub-panel 102 faces the side of the object being tested, for example, the arm side. In the associated operating mode, when the millimeter-wave transceiver units 20 located in the first row, second column, and second row, second column (e.g., two millimeter-wave transceiver units 20) send a detection signal to the object being tested, the four millimeter-wave transceiver units 20 located in the first row, second column, second row, second column, first row, third column, and second row, third column receive echo signals from the object being tested. That is, the two columns of millimeter-wave transceiver units 20 located on both sides of and adjacent to the splicing line 101S both receive echo signals from the object being tested. At this time, a large number of echo signals reflected from the side of the object being tested are received by the two columns of millimeter-wave transceiver units 20. This method is beneficial for detecting the side of the object being tested and can further effectively solve the problem of poor imaging effect on the side of the human body.

[0229] Combined with reference Figure 12 and Figure 16 ,against Figure 16 The millimeter-wave unit array arrangement in the array panel shown, and the control method of the security inspection equipment according to the exemplary embodiments of the present disclosure may include operations S1610 to S1630. The control method of the security inspection equipment may be executed by a processor or by any control device including a processor.

[0230] In operation S1610, multiple control units can be configured. Each control unit includes a transmitting antenna unit and a receiving antenna unit. In one control unit, the transmitting antenna unit includes two columns of transmitting antennas located in row s and column t and in row s+1. The receiving antenna unit includes four rows of receiving antennas adjacent to the transmitting antenna in row s and column t in a second direction and four rows of receiving antennas adjacent to the transmitting antenna in row s and column t+1 in a second direction, where s is a positive integer and 1 ≤ s ≤ e, t is an odd number and 1 ≤ t ≤ f. The multiple units are arranged in an array along the first and second directions to form an array of control units of row e and column f / 2. For example, in Figure 16 In the example shown, a control unit array is formed in rows of 7 rows and columns of 7.

[0231] For example, Figure 16 Two control units are schematically shown in the figure, namely the control unit located in the first row and first column and the control unit located in the first row and second column.

[0232] In operation S1620, the first control step is executed: controlling the two columns of transmitting antennas in the control unit located in row r and column o to send detection signals to the object being detected, and controlling the eight rows of receiving antennas in the control unit located in row r and column o to receive echo signals from the object being detected, where 1≤r≤3, 1≤o≤f / 2, and r and o are both positive integers; and incrementing o by 1, and cyclically executing the above first control step until o = f / 2.

[0233] In operation S1630, the second control step is executed: the two columns of transmitting antennas in the control unit located in row r and column o send detection signals to the object being detected, and the eight rows of receiving antennas in the control unit located in row r and column o receive echo signals from the object being detected, where 1≤r≤3, 1≤o≤f / 2, and r and o are both positive integers; and r is incremented by 1, and the above second control step is executed repeatedly until r = e.

[0234] In other words, in this embodiment, the operating mode of the array panel is as follows: Figure 16 The transceiver antenna selected by box I in the diagram serves as a control unit, containing two rows of transmitting antennas and eight rows of receiving antennas. Starting with the lowest frequency (e.g., 65GHz), the two rows of transmitting antennas (64 antennas in total) sequentially transmit radio frequency signals. After reflection from the object being detected (e.g., the human body), these signals are simultaneously received by the eight rows of receiving antennas (8*32=272 antennas) within the control unit. After completing the scan of one control unit, the process moves half a step to the next control unit, namely the two rows of transmitting antennas and eight rows of receiving antennas selected by box II. The same operating mode as control unit I is used. This process continues until the scan of the control unit in the lower right corner is completed, at which point data acquisition and demodulation of the entire 2m*2m array panel is finished.

[0235] The inventors discovered through research that during scanning using the array panel, it is necessary to switch the transmitting antennas one by one; that is, only one transmitting antenna transmits at any given time, and all receiving antennas within the control unit containing that transmitting antenna receive the signal. The transmitting antennas need to switch not only in spatial location but also in frequency, for example, switching within the 65-85 GHz operating frequency band. For instance, at an imaging distance of approximately 0.5 meters, at least 134 frequency points need to be scanned to avoid artifacts.

[0236] The setup time for each frequency point is typically on the order of microseconds, while the switching time for the transmit channel is on the order of nanoseconds. Therefore, for an array panel, during the scanning process, a frequency point is first established, and all transmit channels in the array transmit sequentially at that frequency point. Then, the signal is switched to the next frequency point. In other words, the transmit antennas transmit one by one first, and then frequency scanning is performed.

[0237] Transmitting data one by one from each of the antennas in the entire array is very time-consuming. Therefore, reducing the number of transmitting antennas is essential to speed up data acquisition. To this end, in the embodiments of this disclosure, in... Figure 5C The panel shown has been improved, and the improved panel unfolded diagram is as follows. Figure 16 As shown. It should be understood that, Figure 16 The panels in the middle can be folded according to the dotted lines to be laid out in a way that is similar to... Figure 5C Similar appearance. Figure 16 In the example shown, the top and bottom of the array panel only have receiving antenna arrays, while all transceiver units on the left and right sides have one column of transmitting antennas removed. In the embodiments of this disclosure, the number of transmitting antennas is reduced, and the scanning control method of the panel is changed, thereby significantly reducing the time spent in the scanning process and improving security inspection efficiency.

[0238] Reference Figure 5C , Figure 8B and Figure 8D Each of the first array panel 100A and the second array panel 100B includes a heart rate detection device 40, the mounting height of which is configured to detect the heart rate of the person being detected. That is, the security inspection equipment according to embodiments of this disclosure provides two heart rate detection devices. For example, the heart rate detection device can employ single-frequency Doppler radar, frequency-modulated continuous wave (FMCW) radar, etc., wherein FMCW radar has better anti-clutter capability. It should be noted that how a heart rate detection device, such as an FMCW radar, detects changes in the position of the chest or back, i.e., detecting minute displacements, can be referred to in the description of related technologies, and will not be repeated here.

[0239] In the embodiments of this disclosure, to avoid mutual interference, the two heart rate detection devices may use different operating frequency bands.

[0240] Figure 14 This is a flowchart of a control method for a security inspection device according to some other exemplary embodiments of this disclosure. For example... Figure 14 As shown, the control method of the security inspection device according to an exemplary embodiment of the present disclosure may include operations S410 to S430. The control method of the security inspection device may be executed by a processor or by any control device including a processor.

[0241] In operation S410, the first heart rate information of the heart rate detection device 40 in the first array panel 100A is acquired.

[0242] In operation S320, the second heart rate information of the heart rate detection device 40 in the second array panel 100B is acquired.

[0243] In operation S330, the heart rate of the human being being tested is determined based on the first heart rate information and the second heart rate information.

[0244] For example, during heart rate detection, the person being detected faces the first array panel 100A and has their back to the second array panel 100B.

[0245] In operation S330, determining the heart rate of the detected human body based on the first heart rate information and the second heart rate information may include: scaling the second heart rate information; and subtracting the scaled second heart rate information from the first heart rate information to obtain the heart rate of the detected human body.

[0246] Figure 15 This is a schematic diagram of a heart rate signal obtained by a security screening device according to an embodiment of the present disclosure. (Refer to...) Figure 15 The heart rate detection device 40 on the front panel (e.g., the first array panel 100A) measures the positional changes of the subject's chest (e.g., ... Figure 15 (Data points in a square). The positional change of the subject's chest is caused by both respiratory movements and heartbeat vibrations, with the positional change caused by heartbeats being about an order of magnitude smaller than that caused by respiration. The heart rate detection device 40 on the back panel (e.g., the second array panel 100B) measures the positional change of the subject's back (e.g., ...). Figure 15 (Data points in a circle). The positional changes of the subject's back are almost entirely caused by respiratory movements, and their amplitude is weaker than that of the chest. Therefore, by simply scaling the positional changes of the back, and then subtracting the positional changes of the back from the positional changes of the chest, the positional changes corresponding to the heartbeat can be obtained (e.g., ...). Figure 15 (X-shaped data points in the data). For Figure 15 The X-shaped data points in the image can be easily processed to determine the subject's heart rate (approximately how many times the heart beats per minute).

[0247] In the embodiments of this disclosure, by setting up dual heart rate detection devices, the positional changes of the subject's chest and back can be detected separately, thereby obtaining a more accurate heart rate value.

[0248] In the embodiments of this disclosure, the emotional state of the person being examined can be determined based on the obtained, more accurate heart rate value. For example, when the heart rate of the person being examined is high, such as above a heart rate threshold, it can be determined that the person is in a state of tension. In this case, it can be determined that the person being examined is more likely to be carrying suspicious items. That is to say, in the embodiments of this disclosure, the obtained heart rate value can be used as one of the auxiliary judgment factors for security checks, which helps to improve the accuracy of security checks.

[0249] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved upon. The structures described in the various embodiments can be freely combined without causing any conflict in structure or principle.

[0250] After a detailed description of the preferred embodiments of this disclosure, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the appended claims, and that this disclosure is not limited to the implementation of the exemplary embodiments described in the specification.

Claims

1. An array panel for millimeter-wave transceiver, characterized in that, The array panel includes at least one sub-panel, each of the at least one sub-panel includes a plurality of millimeter-wave transceiver modules, the plurality of millimeter-wave transceiver modules are arranged in an array along at least one of a first direction and a second direction, the first direction and the second direction intersect. Each of the millimeter-wave transceiver modules is formed as an independent transceiver component, and each of the plurality of millimeter-wave transceiver modules includes a plurality of millimeter-wave transceiver units. In each millimeter-wave transceiver module, the plurality of millimeter-wave transceiver units are arranged in an array along at least one of a first direction and a second direction. Each of the plurality of millimeter-wave transceiver units includes a plurality of transmitting antennas and a plurality of receiving antennas, wherein the midpoint of the line connecting each of the plurality of transmitting antennas and a corresponding receiving antenna among the plurality of receiving antennas serves as an equivalent phase center. The plurality of transmitting antennas are arranged along a first direction, and the plurality of receiving antennas are arranged along a second direction, so as to arrange the plurality of equivalent phase centers into a two-dimensional array; The array panel also includes control circuitry configured to selectively execute independent operating modes and associated operating modes; Along at least one of the array arrangement directions of the plurality of millimeter-wave transceiver modules, the plurality of millimeter-wave transceiver units in each of the millimeter-wave transceiver modules can be divided into two equal halves. In the independent operating mode, the control circuit is configured to control all millimeter-wave transceiver units in a millimeter-wave transceiver module to send detection signals and receive echo signals sequentially along the direction, with a scanning step of one millimeter-wave transceiver module. In the associated operating mode, the control circuit is configured to control half of the millimeter-wave transceiver units in a millimeter-wave transceiver module to send detection signals in successive scan steps along the direction, with half of the millimeter-wave transceiver module as the scan step size, and to control the half of the millimeter-wave transceiver unit and the other half of the millimeter-wave transceiver unit adjacent to it along the direction to receive echo signals.

2. The array panel according to claim 1, characterized in that, The at least one sub-panel includes a first sub-panel and a second sub-panel, the first sub-panel and the second sub-panel are spliced ​​together, and a first predetermined angle is formed between the first sub-panel and the second sub-panel.

3. The array panel according to claim 1, characterized in that, The at least one sub-panel includes a first sub-panel, a second sub-panel, and a third sub-panel. The second sub-panel and the third sub-panel are respectively spliced ​​on opposite sides of the first sub-panel. A first predetermined angle is formed between the first sub-panel and the second sub-panel, and a second predetermined angle is formed between the first sub-panel and the third sub-panel.

4. The array panel according to claim 3, characterized in that, The first predetermined angle is substantially equal to the second predetermined angle.

5. The array panel according to any one of claims 2-4, characterized in that, The first predetermined included angle is between 30° and 150°.

6. The array panel according to any one of claims 1-4, characterized in that, The at least one sub-panel includes a heart rate detection device for detecting the heart rate of the human being being tested.

7. An array panel for millimeter-wave transceiver, characterized in that, The array panel includes a first sub-panel, a second sub-panel, and a third sub-panel. The second sub-panel and the third sub-panel are respectively spliced ​​on opposite sides of the first sub-panel. The first sub-panel is arranged along a first arrangement direction, the second sub-panel is arranged along a second arrangement direction, and the third sub-panel is arranged along a third arrangement direction. The second arrangement direction intersects the first arrangement direction at a first predetermined angle, and the third arrangement direction intersects the first arrangement direction at a second predetermined angle. Each of the first sub-panel, the second sub-panel, and the third sub-panel includes multiple millimeter-wave units. When the second sub-panel and the third sub-panel are both unfolded into the plane where the first sub-panel is located, the millimeter-wave units included in the first sub-panel, the second sub-panel, and the third sub-panel form a millimeter-wave unit array, which includes: A plurality of first millimeter-wave transceiver units are arranged in an array along a first direction and a second direction. Each first millimeter-wave transceiver unit includes at least two rows of receiving antennas and at least two columns of transmitting antennas. In each row of receiving antennas, a plurality of receiving antennas are arranged along the first direction. In each column of transmitting antennas, a plurality of transmitting antennas are arranged along the second direction. A plurality of second millimeter-wave transceiver units are arranged in an array along a second direction. Two columns of the second millimeter-wave transceiver units are respectively disposed on a first side and a second side of the array panel, the first side and the second side being opposite sides of the array panel along the first direction. Each second millimeter-wave transceiver unit includes two rows of receiving antennas and one column of transmitting antennas. In each row of receiving antennas, multiple receiving antennas are arranged along the first direction; in each column of transmitting antennas, multiple transmitting antennas are arranged along the second direction. Multiple millimeter-wave receiving antenna elements are arranged in an array along a first direction. Two rows of these elements are respectively disposed on the third and fourth sides of the array panel, which are opposite sides of the array panel along a second direction. Each millimeter-wave receiving antenna element includes only one row of receiving antennas, and within each row, multiple receiving antennas are arranged along the first direction. In a column of second millimeter-wave transceiver units located on the first side of the array panel, a column of transmitting antennas for each second millimeter-wave transceiver unit is arranged on the side of the column of second millimeter-wave transceiver units close to the first millimeter-wave transceiver unit. Furthermore, in a column of second millimeter-wave transceiver units located on the second side of the array panel, a column of transmitting antennas for each second millimeter-wave transceiver unit is arranged on the side of the column of second millimeter-wave transceiver units close to the first millimeter-wave transceiver unit.

8. The array panel according to claim 7, characterized in that, The number of second millimeter-wave transceiver units in a second millimeter-wave transceiver unit column is equal to the number of first millimeter-wave transceiver units in a first millimeter-wave transceiver unit column; and / or, The number of millimeter-wave receiving antenna elements in a row is equal to the sum of the number of the first and second millimeter-wave transceiver elements in the same row.

9. The array panel according to claim 8, characterized in that, In the millimeter-wave unit array, multiple rows of transmitting antennas are arranged in an array along a first direction and a second direction to form an e-row f-column transmitting antenna array; Multiple rows of receiving antennas are arranged in an array along the first and second directions to form a g-row h-column receiving antenna array, where g = 2e + 2, f = 2h - 2, and e, f, g, and h are all positive integers greater than 1.

10. The array panel according to claim 7, characterized in that, The first predetermined angle is substantially equal to the second predetermined angle.

11. The array panel according to claim 10, characterized in that, The first predetermined included angle is between 30° and 60°.

12. The array panel according to claim 7, characterized in that, At least one of the first sub-panel, the second sub-panel, and the third sub-panel includes a heart rate detection device for detecting the heart rate of the human being being detected.

13. A security inspection device, characterized in that, include: A detection channel, configured to allow an object to be inspected to pass through the security inspection equipment along a predetermined direction of movement; First array panel for millimeter-wave transceiver; as well as A second array panel for millimeter-wave transceiver is provided, wherein the first array panel and the second array panel are respectively disposed on opposite sides of the detection channel in a direction perpendicular to the predetermined direction of movement. Wherein, at least one of the first array panel and the second array panel is the array panel according to claim 1.

14. The security inspection equipment according to claim 13, characterized in that, The at least one sub-panel includes a first sub-panel, a second sub-panel, and a third sub-panel. The second sub-panel and the third sub-panel are respectively spliced ​​on opposite sides of the first sub-panel. The first sub-panel is arranged along a first arrangement direction, the second sub-panel is arranged along a second arrangement direction, and the third sub-panel is arranged along a third arrangement direction. The first arrangement direction is parallel to the predetermined movement direction. The second arrangement direction intersects the first arrangement direction at a first predetermined angle, and the third arrangement direction intersects the first arrangement direction at a second predetermined angle.

15. The security inspection equipment according to claim 13, characterized in that, The at least one sub-panel includes a first sub-panel and a second sub-panel, the first sub-panel and the second sub-panel are spliced ​​together, the first sub-panel is arranged along a fourth arrangement direction, the second sub-panel is arranged along a fifth arrangement direction, the fourth arrangement direction intersects the predetermined movement direction at a third predetermined angle, and the fifth arrangement direction intersects the fourth arrangement direction at a fourth predetermined angle.

16. The security inspection equipment according to any one of claims 13-15, characterized in that, The first array panel and the second array panel are axially symmetrical with respect to the center plane of the detection channel.

17. The security inspection equipment according to claim 16, characterized in that, The first array panel is a symmetrical structure with respect to a central symmetry plane, and the second array panel is a symmetrical structure with respect to a central symmetry plane, wherein the central symmetry plane is perpendicular to the predetermined moving direction.

18. The security inspection equipment according to claim 14, characterized in that, The first sub-panel includes 2m millimeter-wave transceiver modules in the first arrangement direction, the second sub-panel includes m millimeter-wave transceiver modules in the second arrangement direction, and the third sub-panel includes m millimeter-wave transceiver modules in the third arrangement direction, where m is a positive integer greater than or equal to 1.

19. The security inspection equipment according to claim 14, characterized in that, Each of the first sub-panel, the second sub-panel, and the third sub-panel includes n millimeter-wave transceiver modules in the height direction, wherein the height direction is perpendicular to both the second arrangement direction and the first arrangement direction, and n is a positive integer greater than or equal to 2.

20. The security inspection equipment according to claim 15, characterized in that, The first sub-panel includes 2m millimeter-wave transceiver modules in the fourth arrangement direction, and the second sub-panel includes 2m millimeter-wave transceiver modules in the fifth arrangement direction, where m is a positive integer greater than or equal to 1.

21. The security inspection equipment according to claim 20, characterized in that, Each of the first sub-panel and the second sub-panel includes n millimeter-wave transceiver modules in the height direction, wherein the height direction is perpendicular to both the fourth arrangement direction and the fifth arrangement direction, and n is a positive integer greater than or equal to 2.

22. The security inspection equipment according to claim 17, characterized in that, Each of the first array panel and the second array panel includes a heart rate detection device, the mounting height of which is configured to detect the heart rate of the human being being tested.

23. The security inspection equipment according to claim 22, characterized in that, The installation positions of the heart rate detection devices in the first array panel and the second array panel are axially symmetrical with respect to the center plane of the detection channel.

24. The security inspection equipment according to claim 23, characterized in that, Each of the heart rate detection devices includes a transmitting antenna and a receiving antenna. The transmitting and receiving antennas of the heart rate detection devices in the first array panel are symmetrical about the center symmetry plane, and the transmitting and receiving antennas of the heart rate detection devices in the second array panel are symmetrical about the center symmetry plane.

25. A security inspection device, characterized in that, include: A detection channel, configured to allow an object to be inspected to pass through the security inspection equipment along a predetermined direction of movement; First array panel for millimeter-wave transceiver; as well as A second array panel for millimeter-wave transceiver is provided, wherein the first array panel and the second array panel are respectively disposed on opposite sides of the detection channel in a direction perpendicular to the predetermined direction of movement. Wherein, at least one of the first array panel and the second array panel is the array panel according to claim 9.

26. A control method for a security inspection device according to any one of claims 13 to 24, characterized in that, include: The millimeter-wave transceiver unit is controlled to send a detection signal to the object being detected; The millimeter-wave transceiver unit is controlled to receive the echo signal from the object being detected; as well as The image of the detected object is reconstructed based on the received echo signal.

27. The control method according to claim 26, characterized in that, The process of reconstructing the image of the detected object based on the received echo signal includes: In response to different detection modes, an image reconstruction algorithm corresponding to the detection mode is selected; and The selected image reconstruction algorithm is used to reconstruct the image of the detected object based on the received echo signal.

28. The control method according to claim 27, characterized in that, The step of selecting an image reconstruction algorithm corresponding to different detection modes specifically includes: In response to the fast detection mode, select the real-time reconstruction algorithm corresponding to the fast detection mode; and In response to the fine inspection mode, select the backward projection algorithm corresponding to the fine inspection mode.

29. The control method according to any one of claims 26-28, characterized in that, The control of the millimeter-wave transceiver unit to send detection signals to the object being detected includes: controlling a portion of the plurality of millimeter-wave transceiver units to sequentially send detection signals to the object being detected at a first predetermined step size; and / or The control of the millimeter-wave transceiver unit to receive the echo signal from the object being detected includes: controlling a portion of the plurality of millimeter-wave transceiver units to sequentially receive the echo signal from the object being detected at a second predetermined step size.

30. The control method according to claim 29, characterized in that, The security inspection equipment has an independent working mode and an associated working mode. The first predetermined step size in the associated working mode is half of the first predetermined step size in the independent working mode, and the second predetermined step size in the associated working mode is half of the second predetermined step size in the independent working mode.

31. The control method according to claim 30, characterized in that, At least one of the first array panel and the second array panel includes: a millimeter-wave transceiver modules arranged along a predetermined moving direction, and b millimeter-wave transceiver modules arranged along the height direction, wherein a and b are both positive integers greater than or equal to 2; In the independent operating mode, the control method includes: First independent control step: Control all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i and column j to send detection signals to the object being detected, and control all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i and column j to receive echo signals from the object being detected, where 1 ≤ i ≤ b, 1 ≤ j < a, and i and j are both positive integers; and Increment j by 1 and repeat the first independent control step described above until j = a.

32. The control method according to claim 30, characterized in that, At least one of the first array panel and the second array panel includes: a millimeter-wave transceiver modules arranged along a predetermined moving direction, and b millimeter-wave transceiver modules arranged along the height direction, wherein a and b are both positive integers greater than or equal to 2; In the independent operating mode, the control method further includes: The second independent control step involves controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i and column j to send detection signals to the object being detected, and controlling all millimeter-wave transceiver units in the millimeter-wave transceiver module located in row i+1 and column j to receive echo signals from the object being detected, where 1 ≤ i < b, 1 ≤ j ≤ a, and i and j are both positive integers; and Increment i by 1 and repeat the second independent control step described above until i = b.

33. The control method according to claim 31 or 32, characterized in that, Each millimeter-wave transceiver module includes: 2c millimeter-wave transceiver units arranged along a specified direction of movement, and 2d millimeter-wave transceiver units arranged along the height direction, where c and d are both positive integers greater than or equal to 1; Under the aforementioned associated operating mode, the control method includes: The first correlation control step involves controlling the millimeter-wave transceiver units located in row p, column q and row p+1, column q to send detection signals to the object being detected, and controlling the millimeter-wave transceiver units located in row p, column q, row p+1, column p+1, and column p+1 to receive echo signals from the object being detected, where 1 ≤ p ≤ 2bd, 1 ≤ q < 2ac, and p and q are both positive integers; and Increment q by 1 and repeat the first associated control step described above until q = 2ac.

34. The control method according to claim 31 or 32, characterized in that, Each millimeter-wave transceiver module includes: 2c millimeter-wave transceiver units arranged along a specified direction of movement, and 2d millimeter-wave transceiver units arranged along the height direction, where c and d are both positive integers greater than or equal to 1; In the associated operating mode, the control method further includes: The second correlation control step involves controlling the millimeter-wave transceiver units located in row p, column q and row p+1, column q to send detection signals to the object being detected, and controlling the millimeter-wave transceiver units located in row p, column q, row p+1, column p+1, and column p+1 to receive echo signals from the object being detected, where 1 ≤ p < 2bd, 1 ≤ q ≤ 2ac, and p and q are both positive integers; and Increment p by 1 and repeat the second association control step described above until p = 2bd.

35. The control method according to any one of claims 26-28, characterized in that, Each of the first and second array panels includes a heart rate detection device, the mounting height of which is configured to detect the heart rate of the person being detected. The control method further includes: Obtain the first heart rate information from the heart rate detection device in the first array panel; Acquire the second heart rate information from the heart rate detection device in the second array panel; and The heart rate of the human being being tested is determined based on the first heart rate information and the second heart rate information.

36. The control method according to claim 35, characterized in that, During heart rate detection, the human body being detected faces the first array panel and has its back to the second array panel; Determining the heart rate of the human being being tested based on the first heart rate information and the second heart rate information includes: The second heart rate information is scaled; and The heart rate of the detected human body is obtained by subtracting the scaled second heart rate information from the first heart rate information.

37. A control method for a security inspection device according to claim 25, characterized in that, include: The millimeter-wave transceiver unit is controlled to send a detection signal to the object being detected; The millimeter-wave transceiver unit is controlled to receive the echo signal from the object being detected; as well as The image of the detected object is reconstructed based on the received echo signal.

38. The control method according to claim 37, characterized in that, Also includes: Multiple control units are provided, each control unit including a transmitting antenna unit and a receiving antenna unit. In one control unit, the transmitting antenna unit includes two columns of transmitting antennas located at row s and column t and row s and column t+1. The receiving antenna unit includes four rows of receiving antennas adjacent to the column of transmitting antennas located at row s and column t in a second direction and four rows of receiving antennas adjacent to the column of transmitting antennas located at row s and column t+1 in a second direction. Where s is a positive integer and 1≤s≤e, t is an odd number and 1≤t≤f. The multiple control units are arranged in an array along the first direction and the second direction to form an array of control units with rows e and columns f / 2. First control step: Control the two transmitting antennas in the control unit located in row r, column o to send detection signals to the object being detected, and control the eight receiving antennas in the control unit located in row r, column o to receive the echo signals from the object being detected, where 1 ≤ r ≤ 3, 1 ≤ o ≤ f / 2, and r and o are both positive integers; and Increment o by 1 and repeat the first control step above until o = f / 2.

39. The control method according to claim 37 or 38, characterized in that, Also includes: The second control step involves controlling two rows of transmitting antennas in the control unit located in row r, column o to send detection signals to the object being detected, and controlling eight rows of receiving antennas in the control unit located in row r, column o to receive echo signals from the object being detected, where 1 ≤ r ≤ 3, 1 ≤ o ≤ f / 2, and r and o are both positive integers; and Increment r by 1 and repeat the second control step above until r = e.

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