Security equipment

Abstract

A security inspection device is provided, comprising: a detection channel, wherein the detection channel is constructed for an object to be detected to pass through the security inspection device along a predetermined moving 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 arranged on opposite sides of the detection channel in a direction perpendicular to the predetermined moving direction, wherein at least one of the first array panel and the second array panel comprises: at least one sub-panel for millimeter wave transceiver; and at least one reflecting plate for reflecting millimeter waves, wherein in at least one of the first array panel and the second array panel, the at least one sub-panel is fixedly connected or rotatably connected to the at least one reflecting plate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of security detection, and in particular to a security inspection device. Background Art

[0002] X-ray machines are usually used to conduct security checks on items. Since X-rays are ionizing, they are mainly used to detect luggage items. If they are used in human body security checks, their safety is likely to be questioned by the public.

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

[0004] According to one aspect of the present disclosure, there is provided a security inspection device, comprising:

[0005] A detection channel, wherein the detection channel is configured to allow a detected object to pass through the security inspection device along a predetermined moving direction;

[0006] A first array panel for millimeter wave transceiver; and

[0007] a second array panel for millimeter wave transceiver, wherein the first array panel and the second array panel are respectively arranged on opposite sides of the detection channel in a direction perpendicular to the predetermined moving direction,

[0008] Wherein, at least one of the first array panel and the second array panel comprises:

[0009] at least one subpanel for millimeter wave transceiver; and

[0010] at least one reflector for reflecting millimeter waves,

[0011] Wherein, in at least one of the first array panel and the second array panel, the at least one sub-panel is fixedly connected or rotatably connected to the at least one reflective plate.

[0012] According to some exemplary embodiments, in the first array panel, the at least one sub-panel includes a first sub-panel, and the at least one reflective plate includes a first reflective plate; and in the second array panel, the at least one sub-panel includes a second sub-panel, and the at least one reflective plate includes a second reflective plate.

[0013] According to some exemplary embodiments, the first sub-panels are arranged along a first arrangement direction, which is parallel to the predetermined moving direction; the first reflective plates are arranged along a third arrangement direction, which intersects the first arrangement direction at a first predetermined angle.

[0014] According to some exemplary embodiments, the second sub-panel is arranged along a second arrangement direction, which is parallel to the predetermined moving direction; the second reflective plate is arranged along a fourth arrangement direction, which intersects the second arrangement direction at a second predetermined angle.

[0015] According to some exemplary embodiments, the first reflection plate is arranged at an upstream side of the first sub-panel along the predetermined moving direction; and the second reflection plate is arranged at a downstream side of the second sub-panel along the predetermined moving direction.

[0016] According to some exemplary embodiments, the first reflective plate is fixedly connected to the first sub-panel so that the first predetermined angle remains unchanged; and / or the second reflective plate is fixedly connected to the second sub-panel so that the second predetermined angle remains unchanged.

[0017] According to some exemplary embodiments, the first reflective plate is rotatably connected to the first sub-panel so that the first predetermined angle can be changed; and / or the second reflective plate is rotatably connected to the second sub-panel so that the second predetermined angle can be changed.

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

[0019] According to some exemplary embodiments, in the first array panel, the at least one reflective plate also includes a third reflective plate; the first reflective plate and the third reflective plate are respectively fixedly connected or rotatably connected to opposite sides of the first sub-panel, the first sub-panel is arranged along a first arrangement direction, the first reflective plate is arranged along a third arrangement direction, and the third reflective plate is arranged along a fifth arrangement direction, the first arrangement direction is parallel to the predetermined moving direction, the third arrangement direction intersects with the first arrangement direction at a first predetermined angle, and the fifth arrangement direction intersects with the first arrangement direction at a third predetermined angle.

[0020] According to some exemplary embodiments, in the second array panel, the at least one reflective plate also includes a fourth reflective plate; the second reflective plate and the fourth reflective plate are respectively fixedly connected or rotatably connected to opposite sides of the second sub-panel, the second sub-panel is arranged along a second arrangement direction, the second reflective plate is arranged along a fourth arrangement direction, and the fourth reflective plate is arranged along a sixth arrangement direction, the second arrangement direction is parallel to the predetermined moving direction, the fourth arrangement direction intersects with the second arrangement direction at a second predetermined angle, and the sixth arrangement direction intersects with the second arrangement direction at a fourth predetermined angle.

[0021] According to some exemplary embodiments, the first reflective plate and the third reflective plate are respectively fixedly connected to the first sub-panel, so that the first predetermined angle and the third predetermined angle remain unchanged; and / or the second reflective plate and the fourth reflective plate are respectively fixedly connected to the second sub-panel, so that the second predetermined angle and the fourth predetermined angle remain unchanged.

[0022] According to some exemplary embodiments, the first reflective plate and the third reflective plate are respectively rotatably connected to the first sub-panel, so that the first predetermined angle and the third predetermined angle can be changed; and / or the second reflective plate and the fourth reflective plate are respectively rotatably connected to the second sub-panel, so that the second predetermined angle and the fourth predetermined angle can be changed.

[0023] According to some exemplary embodiments, the first predetermined angle is substantially equal to the second predetermined angle; and / or the third predetermined angle is substantially equal to the fourth predetermined angle.

[0024] According to some exemplary embodiments, the width of the first reflective plate along the second arrangement direction is between 0.5 and 0.7 of the width of the first sub-panel along the first arrangement direction; and / or, the height of the first reflective plate along the height direction is substantially equal to the height of the first sub-panel along the height direction, and the height direction is perpendicular to both the second arrangement direction and the first arrangement direction; and / or, the width of the second reflective plate along the fourth arrangement direction is between 0.5 and 0.7 of the width of the second sub-panel along the second arrangement direction; and / or, the height of the second reflective plate along the height direction is substantially equal to the height of the second sub-panel along the height direction.

[0025] According to some exemplary embodiments, the width of the third reflector along the fifth arrangement direction is between 0.5 and 0.7 of the width of the first sub-panel along the first arrangement direction; and / or the height of the third reflector along the height direction is substantially equal to the height of the first sub-panel along the height direction, and the height direction is perpendicular to both the second arrangement direction and the first arrangement direction; and / or the width of the fourth reflector along the sixth arrangement direction is between 0.5 and 0.7 of the width of the second sub-panel along the second arrangement direction; and / or the height of the fourth reflector along the height direction is substantially equal to the height of the second sub-panel along the height direction.

[0026] According to some exemplary embodiments, at least one of the first sub-panel and the second sub-panel includes a one-dimensional multiple-transmit multiple-receive antenna array, the one-dimensional multiple-transmit multiple-receive antenna array including a plurality of transmitting antennas arranged in a first row and a plurality of receiving antennas arranged in a second row, the plurality of transmitting antennas and the equivalent phase centers formed by the plurality of antennas are arranged in a third row and are spaced apart at equal intervals of one-half the wavelength of the detection signal, wherein the first row, the second row and the third row are parallel to each other.

[0027] According to some exemplary embodiments, each of the first sub-panel and the second sub-panel has a curved shape; and each of the first sub-panel and the second sub-panel includes a one-dimensional multiple-transmit multiple-receive antenna array, the one-dimensional multiple-transmit multiple-receive antenna array includes multiple transmitting antennas and multiple receiving antennas, and the equivalent phase centers formed by the multiple transmitting antennas and the multiple antennas are arranged in an arc.

[0028] According to some exemplary embodiments, the security inspection equipment also includes: a first frame, on which the first array panel is arranged and can be moved along the height direction on the first frame; and a second frame, on which the second array panel is arranged and can be moved along the height direction on the second frame.

[0029] According to some exemplary embodiments, at least one of the first sub-panel and the second sub-panel includes a two-dimensional multi-transmit and multi-receive antenna array, the two-dimensional multi-transmit and multi-receive antenna array includes a plurality of millimeter-wave transceiver units, and the plurality of millimeter-wave transceiver units are arranged in an array along a first direction and a second direction; at least one of the plurality of millimeter-wave transceiver units includes a plurality of transmitting antennas and a plurality of receiving antennas, the plurality of transmitting antennas are arranged along the first direction, and the plurality of receiving antennas are arranged along the second direction, the midpoint of a line connecting each of the plurality of transmitting antennas and a corresponding one of the plurality of receiving antennas serves as an equivalent phase center, and the plurality of transmitting antennas and the plurality of receiving antennas are arranged so that the equivalent phase centers are arranged in a two-dimensional array.

[0030] According to some exemplary embodiments, each of the first reflective plate and the second reflective plate has a curved shape; the first reflective plate and the second reflective plate can move relative to the first sub-panel and the second sub-panel, respectively, so that the security inspection device can switch between an open state and a closed state, wherein in the open state the entrance and exit of the detection channel are both open, and in the closed state the entrance and exit of the detection channel are both closed.

[0031] According to some exemplary embodiments, the first reflective plate and the second reflective plate are rotatable relative to the first sub-panel and the second sub-panel, respectively.

[0032] According to some exemplary embodiments, the first reflective plate and the second reflective plate are push-pull movable relative to the first sub-panel and the second sub-panel, respectively.

[0033] According to some exemplary embodiments, the first sub-panel includes a first slide groove, and the first reflective plate can move in the first slide groove; and / or the second sub-panel includes a second slide groove, and the second reflective plate can move in the second slide groove.

[0034] According to some exemplary embodiments, at least one of the first sub-panel and the second sub-panel includes a one-dimensional multi-transmit multi-receive antenna array or a two-dimensional multi-transmit multi-receive antenna array; and each of the first reflector and the second reflector has a curved shape.

[0035] According to some exemplary embodiments, the arc surface has a center and a radius; the radius is 1 to 1.5 times the vertical distance between the center and the first sub-panel.

[0036] According to some exemplary embodiments, at least one of the first predetermined angle, the second predetermined angle, the third predetermined angle and the fourth predetermined angle is between 10° and 80°.

[0037] According to some exemplary embodiments, the at least one sub-panel includes a heart rate detection device, and the heart rate detection device is used to detect the heart rate of the detected human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a security inspection device according to some exemplary embodiments of the present disclosure is shown.

[0039] Figure 2 A schematic structural diagram of a 1D MIMO antenna array according to an embodiment of the present disclosure is shown.

[0040] Figure 3A and Figure 3B A schematic diagram of the structure of a millimeter wave transceiver unit and a schematic diagram of an equivalent phase center according to some embodiments of the present disclosure are respectively shown.

[0041] Figure 4 A schematic structural diagram of a millimeter wave transceiver unit according to some other embodiments of the present disclosure is shown.

[0042] Figure 5 A schematic structural diagram of a millimeter wave transceiver module according to some embodiments of the present disclosure is shown.

[0043] FIG. 6A to FIG. 6C They are schematic diagrams of the structures of array panels for millimeter wave transceiver according to some exemplary embodiments of the present disclosure.

[0044] Fig. 7A It is a schematic diagram of the structure of security inspection equipment according to some exemplary embodiments of the present disclosure.

[0045] Figure 7B yes Fig. 7A A schematic top view of the security inspection equipment shown.

[0046] FIG. 8A to FIG. 8D They are schematic top views of security inspection devices according to other exemplary embodiments of the present disclosure.

[0047] Fig. 9A It is a schematic diagram of the structure of security inspection equipment according to some exemplary embodiments of the present disclosure.

[0048] Fig. 9B yes Fig. 9A The schematic diagram of the structure of two array panels of the security inspection equipment is shown.

[0049] Fig. 9C yes Fig. 9A A schematic top view of the security inspection equipment shown.

[0050] Fig.9D Schematic top view of security inspection equipment according to other exemplary embodiments of the present disclosure.

[0051] Fig. 10A It is a schematic diagram of the structure of security inspection equipment according to some exemplary embodiments of the present disclosure.

[0052] Fig. 10B yes Fig. 10A A schematic top view of the security inspection equipment shown.

[0053] Fig. 10C It is a schematic top view of a security inspection device according to some other exemplary embodiments of the present disclosure, wherein the sub-panel and the reflective plate are rotatably connected.

[0054] FIG. 11A to FIG. 11B They are schematic structural diagrams of security inspection equipment according to other exemplary embodiments of the present disclosure.

[0055] Fig. 11C yes Fig. 11B A schematic top view of the security inspection equipment shown.

[0056] Fig. 12A It is a schematic top view of security inspection equipment according to some other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in a closed state.

[0057] Fig. 12B It is a schematic top view of security inspection equipment of other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in an open state.

[0058] Fig. 12C It is a schematic top view of security inspection equipment according to some other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in a closed state.

[0059] Fig.12D It is a schematic top view of security inspection equipment of other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in an open state.

[0060] Fig.13 1 is a schematic top view of security inspection equipment according to some other exemplary embodiments of the present disclosure, in which embodiments of line / surface arrays and cylindrical reflective plates are schematically shown.

[0061] Fig.14 is a flowchart of a method for controlling a security inspection device according to some exemplary embodiments of the present disclosure.

[0062] Fig.15 A schematic diagram showing the working principle of a 2D MIMO millimeter wave transceiver module according to an embodiment of the present disclosure is shown.

[0063] Fig.16 is a flowchart of a method for controlling a security inspection device according to some other exemplary embodiments of the present disclosure.

[0064] Fig.17 It is a schematic diagram of a heart rate signal obtained by a security inspection device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0065] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details do not have to be adopted to implement the present invention. In other examples, in order to avoid confusing the present invention, known structures, materials or methods are not specifically described.

[0066] Throughout the specification, references to "some exemplary embodiments," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least some exemplary embodiments of the present 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 all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any appropriate combination and / or subcombination. In addition, it should be understood by those of ordinary skill in the art that the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0067] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0068] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0069] The terms "upper", "lower", "left" and "right" used in this specification are not intended to limit the absolute position of components, but to describe the relative position of components in the view to aid understanding; the "top side" and "bottom side" in this specification are relative to the upper and lower sides of an object standing upright in general; "first", "second" and the like are not for sorting, but to distinguish different components.

[0070] It should be noted that in the embodiments of the present disclosure, when the detected object is a human body, the side or the side where the human face is located is the front or front side of the human body, and the side where the human arm is located is the side or the side of the human body.

[0071] Figure 1 Schematic diagram of security inspection equipment according to some exemplary embodiments of the present disclosure is shown. Figure 1 As shown, the security inspection device 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 one-dimensional multiple-input multiple-output (1D MIMO) array panel, or a two-dimensional multiple-input multiple-output (2D MIMO) array panel.

[0072] The array panel 1 for millimeter wave transceiver may include a millimeter wave transceiver module and a control circuit. For example, the millimeter wave transceiver module may be a 1D MIMO module or a 2D MIMO module. The millimeter wave transceiver module may include at least one millimeter wave transceiver unit, such as a 1D MIMO unit or a 2D MIMO unit.

[0073] 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 one of the multiple receiving antennas is used as an equivalent phase center, and the multiple transmitting antennas and the multiple receiving antennas are arranged so that the equivalent phase centers are arranged in a one-dimensional array or a two-dimensional array. The control circuit can control the multiple transmitting antennas to transmit detection signals in the form of electromagnetic waves to the detected object in a preset order, and control the multiple receiving antennas to receive echo signals from the detected object.

[0074] The signal processing device 2 can reconstruct an image of the detected object based on the echo signals received by the multiple receiving antennas. Figure 1 In the embodiment, 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 the form of microwave millimeter waves to the detected object. The echo signal generated after the detection signal reaches the detected object is received by the 2D MIMO array panel 1, which carries the 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 the form of a power signal into an analog signal and sends it to the digital-to-analog converter 22. The digital-to-analog 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.

[0075] In some embodiments, the security inspection device 10 may further include a distance measuring device 4. The distance measuring device 4 may be installed on the 1D MIMO or 2D MIMO array panel 1 to measure the distance between the detected object and the 1D MIMO or 2D MIMO array panel 1. Figure 1 As shown. The distance measuring device 4 can be implemented by various distance detection devices, including but not limited to distance measuring radar, proximity sensor, etc. In the case of including the distance measuring device 4, the signal processing device 2 in the security inspection device 10 can reconstruct the image of the detected object according to the distance between the detected object and the 1D MIMO or 2D MIMO array panel 1 detected by the distance measuring device 4 and the echo signal received by the 1D MIMO or 2D MIMO array panel 1.

[0076] In some embodiments, the security inspection device 10 may further include a display device 3, which may be connected to the signal processing device 2 and is used to display the image of the detected object reconstructed by the signal processing device 2. The display device 3 may be implemented as various devices with display functions, such as a display screen, a projector, and the like.

[0077] In some embodiments, the security inspection device 10 may also include an alarm device connected to the signal processing device 2. In this case, the signal processing device 2 may also determine whether the detected object may contain a suspect based on a preset standard according to the reconstructed image of the detected object, and if so, control the alarm device to alarm. The alarm device may be implemented in various forms, including but not limited to devices such as speakers, vibrators, and sirens that sound alarms through audio, vibration, and various other methods. The alarm level may also be set. For example, the signal processing device 2 may control the alarm device to sound an alarm with a lower volume or weaker vibration when the probability of containing a suspect is low, and control the alarm device to sound an alarm with a higher volume or stronger vibration when the probability of containing a suspect is high.

[0078] For example, the suspects may include but are not limited to guns, knives, explosives, drugs and other dangerous goods.

[0079] Figure 2 A schematic structural diagram of a 1D MIMO antenna array according to an embodiment of the present disclosure is shown, wherein a square represents a transmitting antenna Tx, a circle represents a receiving antenna Rx, and a triangle represents an equivalent phase center.

[0080] like Figure 2 As shown, the 1D MIMO antenna array includes a plurality of transmitting antennas T arranged in the first row and a plurality of receiving antennas Rx arranged in the second row, and one transmitting antenna corresponds to 8 receiving antennas. The plurality of transmitting antennas Tx are spaced at an equal distance of 4λ (λ represents the wavelength of the detection signal), and the plurality of receiving antennas Rx are spaced at an equal distance of λ. The transmitting antenna Tx at the head of the first row is aligned with the receiving antenna Rx at the head of the second row so that the connecting line between the two is perpendicular to the direction of the first row and the second row. The second transmitting antenna Tx in the first row is aligned with the fifth transmitting antenna Rx in the second row, and so on. The equivalent phase centers are arranged in the third row between the first row and the second row, and are spaced at an equal distance of λ / 2. According to an embodiment of the present disclosure, the distance between the group of transmitting antennas in the first row and the group of receiving antennas in the second row can be arbitrary, but it is advantageous to keep the distance between the group of transmitting antennas in the first row and the group of receiving antennas in the second row as small as possible, because too large a distance will cause the equivalent phase center condition to fail to hold; however, in practical applications, too short a distance will cause implementation difficulties, crosstalk and space arrangement problems. In one embodiment, the distance between the group of transmitting antennas in the first row and the group of receiving antennas in the second row is less than 10% of the imaging distance.

[0081] The following will refer to Figure 3A , Figure 3B and Figure 4To describe the structure of the millimeter wave transceiver unit in the 2D MIMO array panel according to an embodiment of the present disclosure.

[0082] According to an embodiment of the present disclosure, a millimeter wave transceiver unit may include a plurality of transmitting antennas and a plurality of receiving antennas arranged in an array, and the transmitting antennas and the receiving antennas may be mounted on a substrate and arranged in a variety of forms 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 times, 2 times, 3 times, 4 times, 5 times, 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 that the image of the detected object can be correctly reconstructed.

[0083] For example, a millimeter wave transceiver unit may include 2N transmitting antennas and 2N receiving antennas, which are evenly distributed on a rectangular frame at intervals of one wavelength. When the operating frequency is determined, 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 example, the antenna interval in a millimeter wave transceiver unit is one wavelength, and the equivalent phase center generated is half a wavelength. For example, the side length of a millimeter wave transceiver unit can be selected to be 5-20 cm.

[0084] Figure 3A and Figure 3B A schematic diagram of the structure of a millimeter wave transceiver unit and a schematic diagram of an equivalent phase center according to some embodiments of the present disclosure are respectively shown.

[0085] like Figure 3A As shown, the millimeter wave transceiver unit 20 includes two rows of transmitting antennas Tx arranged in the horizontal direction and two columns of receiving antennas Rx arranged in the vertical direction, and the two rows of transmitting antennas Tx and the two columns of receiving antennas Rx form a rectangular pattern. Figure 3A In the figure, the size of the millimeter wave transceiver unit 20 can be 20 cm×20 cm, and the number of transmitting antennas Tx and receiving antennas Rx are 96 and 96 respectively. For the sake of simplicity, the number of transmitting antennas Tx and receiving antennas Rx is only for illustration, not the actual number.

[0086] like Figure 3BAs shown, the equivalent position 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 embodiment of the present disclosure, the midpoint of the line connecting the transmitting antenna and the corresponding receiving antenna is used as the equivalent phase center of the two. Under the MIMO architecture, one transmitting antenna Tx corresponds to multiple receiving antennas Rx. In the embodiment of the present disclosure, the receiving antenna Rx and the transmitting antenna Tx are set to be not in the same position. This system with spatial separation of the transmitting and receiving antennas can be simulated using a virtual system. In the virtual system, a virtual position is added between each group of transmitting antennas Tx and receiving antennas Rx. 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 antennas at the location of their equivalent phase center.

[0087] Figure 3A and Figure 3B 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 imaging sampling interval (i.e., the interval between equivalent phase centers) is on the order of λ / 2, which ensures that there is no artifact superposition in the reconstructed image.

[0088] Figure 4 The schematic diagram of the structure of the millimeter wave transceiver unit according to some other embodiments of the present disclosure is shown. As shown in FIG3, "*" represents a transmitting antenna, "○" represents a receiving antenna, Figure 4 The units of the horizontal and vertical coordinates in are both "meters". For example, when the operating frequency is E band, N=32, the side length of a millimeter wave transceiver unit can be about 13.6 centimeters.

[0089] Figure 5 A schematic diagram of the structure of a millimeter wave transceiver module according to some embodiments of the present disclosure is shown. In an embodiment of the present disclosure, a millimeter wave transceiver module 30 may include multiple millimeter wave transceiver units 20. The size of a millimeter wave transceiver module is related to the overall size and imaging area of ​​the array panel. For example, a millimeter wave transceiver module 30 may include 2×2 millimeter wave transceiver units, the size of each millimeter wave transceiver unit may be set to 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.

[0090] It should be noted that Figure 5The number and array arrangement shown in are only illustrative. In other embodiments of the present disclosure, the number 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 the present disclosure are not intended to limit the number and array arrangement of millimeter-wave transceiver units.

[0091] In the embodiment of the present 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 may be formed as an independent transceiver module, so that the array panel may be formed in a modular manner.

[0092] For example, each millimeter wave transceiver module 30 can be formed as a 76-81 GHz, 70-80 GHz, or 65-80 GHz chip. In this way, the millimeter wave transceiver module according to the embodiment of the present disclosure has the advantages of high integration and low cost.

[0093] FIG. 6A to FIG. 6C They are schematic diagrams of the structures of array panels for millimeter wave transceiver according to some exemplary embodiments of the present disclosure.

[0094] Combined with reference Figures 1 to 6C In the embodiment of the present disclosure, the array panel 100 for millimeter wave transceiver may include at least one sub-panel. Fig. 6A In the illustrated embodiment, the array panel 100 includes one sub-panel, namely, a first sub-panel 101. Figure 6B 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 6C 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 .

[0095] In an embodiment of the present disclosure, each of the at least one sub-panel includes a plurality of millimeter wave transceiver modules, and the plurality of millimeter wave transceiver modules 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, for example, the first direction X and the second direction Y may be perpendicular to each other.

[0096] For example, the first sub-panel 101 may include 4×2 millimeter wave transceiver modules 30 , that is, in the first sub-panel 101 , the millimeter wave transceiver modules 30 are arranged in 4 rows and 2 columns.

[0097] In an embodiment of the present disclosure, each millimeter wave transceiver module 30 may include a plurality of millimeter wave transceiver units 20. In each millimeter wave transceiver module, the plurality of millimeter wave transceiver units 20 are arranged in an array along at least one of the first direction X and the second direction Y.

[0098] For example, each millimeter wave transceiver module 30 may include 2×2 millimeter wave transceiver units 20 , that is, in one millimeter wave transceiver module 30 , the millimeter wave transceiver units 20 are arranged in 2 rows and 2 columns.

[0099] 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 one of the multiple receiving antennas serves as an equivalent phase center, and the multiple transmitting antennas and the multiple receiving antennas are arranged so that the equivalent phase centers are arranged in a two-dimensional array.

[0100] Reference Figure 6B The first sub-panel 101 and the second sub-panel 102 are spliced, and a first predetermined angle α is formed between the first sub-panel 101 and the second sub-panel 102. For example, the first predetermined angle may be between 30° and 150°, for example, between 30° and 60°, for example, about 30°.

[0101] Reference Figure 6C , the second sub-panel 102 and the third sub-panel 103 are respectively spliced ​​on 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 is substantially equal to the second predetermined angle. For example, the first predetermined angle may be between 30° and 150°, for example, between 30° and 60°, for example, about 30°.

[0102] In the embodiments of the present disclosure, various forms of array panels can be formed by combining multiple millimeter wave transceiver modules, that is, the array panel can adopt a completely modular design, which is conducive to the rapid formation of array panels of different forms, thereby expanding the application scenarios of the array panels.

[0103] In the embodiments of the present disclosure, the various millimeter wave transceiver modules can be arranged at an angle to achieve multi-viewing angle detection. In this way, when reconstructing an image, multi-angle fusion of the image can be achieved, which is beneficial to improving the accuracy of imaging.

[0104] Optionally, the array panel 100 may further include a heart rate detection device 40, and the heart rate detection device 40 is used to detect the heart rate of a detected human body.

[0105] Fig. 7A It is a schematic diagram of the structure of security inspection equipment according to some exemplary embodiments of the present disclosure. Figure 7B yes Fig. 7A A schematic top view of the security inspection equipment shown. FIG. 8A to FIG. 8D They are schematic top views of security inspection devices according to other exemplary embodiments of the present disclosure.

[0106] Combined with reference Figures 1 to 8D In an embodiment of the present disclosure, the security inspection device 10 may include: a detection channel D, which is configured to allow an object OB to be detected to pass through the security inspection device along a predetermined moving 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 arranged on opposite sides of the detection channel D in a direction perpendicular to the predetermined moving 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-mentioned embodiment.

[0107] For example, in 7A to 8D In the top view shown, the predetermined moving direction MD is the horizontal direction, and the direction perpendicular to the predetermined moving direction is the vertical direction.

[0108] For example, each of the first array panel 100A and the second array panel 100B is the array panel 100 provided in any of the above embodiments.

[0109] Refer to Figure 6. Fig. 7A , Figure 7B , Fig. 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.

[0110] For example, the first arrangement direction D1 is parallel to the predetermined moving 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.

[0111] For example, the first predetermined angle is substantially equal to the second predetermined angle. For example, the first predetermined angle may be between 30° and 150°, for example, between 30° and 60°, such as about 30°, 45°, 60°, etc.

[0112] Reference Figure 8C and Fig.8D , the at least one sub-panel includes a first sub-panel 101 and a second sub-panel 102, the first sub-panel 101 and the second sub-panel 102 are spliced, the first sub-panel 101 is arranged along a fourth arrangement direction D4, the second sub-panel 102 is arranged along a fifth arrangement direction D5, the fourth arrangement direction D4 intersects with the predetermined moving direction MD at a third predetermined angle γ, and the fifth arrangement direction D5 intersects with the fourth arrangement direction D4 at a fourth predetermined angle θ. That is, each array panel includes two sub-panels, and the two sub-panels are arranged at a certain angle. For example, the third predetermined angle γ can be between 30° and 60°, such as about 30°, 45°, 60°, etc. The fourth predetermined angle θ can be between 90° and 150°, such as about 120°, 135°, 150°, etc.

[0113] In the embodiments of the present disclosure, the various millimeter wave transceiver modules can be arranged at an angle to achieve multi-viewing angle detection. In this way, when reconstructing an image, multi-angle fusion of the image can be achieved, which is beneficial to improving the accuracy of imaging.

[0114] For example, the detection channel D has a center plane DT, such as Figure 7B The first array panel 100A and the second array panel 100B are in an axisymmetric relationship with respect to the central plane DT of the detection channel.

[0115] Reference Figure 7B , the detection channel D may have an inlet DI and an outlet DO. The width of the inlet DI and the outlet DO (i.e., the width of the inlet Figure 7B The vertical dimension of the inlet DI and the outlet DO may be substantially equal. For example, the width of the inlet DI and the outlet DO may be between 40 and 100 cm. The central plane DT of the detection channel D may bisect the width of the inlet DI, that is, Figure 7B In the illustrated embodiment, the width of the inlet DI on both sides of the center plane DT of the detection channel D is half of the width of the inlet DI.

[0116] Referring to FIG. B7 , the first array panel 100A is a symmetrical structure with respect to the central symmetric plane, and the second array panel 100B is a symmetrical structure with respect to the central symmetric plane ST (eg Figure 7B The symmetrical structure is shown by the vertical dotted line in the figure, and the central symmetry plane ST is perpendicular to the predetermined moving direction MD.

[0117] For example, in Fig. 7A In 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, wherein 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, wherein 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.

[0118] That is, in the first sub-panel 101, the plurality of 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, the plurality of 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, the plurality of millimeter wave transceiver modules 30 are arranged in an array of n rows and m columns, for example, in a 4×1 array. In this way, in the first array panel 100A, the plurality of millimeter wave transceiver modules 30 are arranged in a 4×4 array.

[0119] For example, in Fig. 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, wherein 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, wherein 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.

[0120] That is, in the first sub-panel 101, the plurality of millimeter wave transceiver modules 30 are arranged in an array of n rows and m columns. In the second sub-panel 102, the plurality of millimeter wave transceiver modules 30 are arranged in an array of n rows and m columns. In the third sub-panel 103, the plurality of millimeter wave transceiver modules 30 are arranged in an array of n rows and m columns.

[0121] For example, in Figure 8C and Fig.8D In 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.

[0122] That is, in the first sub-panel 101, the plurality of millimeter wave transceiver modules 30 are arranged in an array of 2n rows and 2m columns. In the second sub-panel 102, the plurality of millimeter wave transceiver modules 30 are arranged in an array of 2n rows and 2m columns.

[0123] Optionally, each of the first array panel 100A and the second array panel 100B includes a heart rate detection device 40, and the installation height of the heart rate detection device 40 is configured to be suitable for detecting the heart rate of the detected human body.

[0124] For example, the installation position of the heart rate detection device 40 in the first array panel 100A and the installation position of the heart rate detection device 40 in the second array panel 100B are axially symmetrical with respect to the central plane DT of the detection channel.

[0125] Reference Figure 6C , Figure 8B and Fig.8D Each of the heart rate detection devices 40 includes a transmitting antenna 40T and a receiving antenna 40R. For example, the installation positions of 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 installation positions of 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.

[0126] Fig. 9A It is a schematic diagram of the structure of security inspection equipment according to some exemplary embodiments of the present disclosure. Fig. 9B yes Fig. 9A The schematic diagram of the structure of two array panels of the security inspection equipment is shown. Fig. 9C yes Fig. 9AA schematic top view of the security inspection equipment shown. Fig.9D Schematic top view of security inspection equipment according to other exemplary embodiments of the present disclosure. Fig. 10A It is a schematic diagram of the structure of security inspection equipment according to some exemplary embodiments of the present disclosure. Fig. 10B yes Fig. 10A A schematic top view of the security inspection equipment shown. Fig. 10C It is a schematic top view of a security inspection device according to some other exemplary embodiments of the present disclosure, wherein the sub-panel and the reflective plate are rotatably connected. FIG. 11A to FIG. 11B They are schematic structural diagrams of security inspection equipment according to other exemplary embodiments of the present disclosure. Fig. 11C yes Fig. 11B A schematic top view of the security inspection equipment shown.

[0127] Combined with reference 9A to 11C In an embodiment of the present disclosure, the security inspection device may include a detection channel D, the detection channel being configured to allow the detected object OB to pass through the security inspection device along a predetermined moving direction MD; a first array panel 100A for millimeter wave transceiver; and a second array panel 100B for millimeter wave transceiver, the first array panel 100A and the second array panel 100B being arranged in a direction perpendicular to the predetermined moving direction MD ( Fig. 9C In the embodiment of the present disclosure, at least one of the first array panel 100A and the second array panel 100B comprises: at least one sub-panel for millimeter wave transmission and reception; and at least one reflective plate for reflecting millimeter waves, wherein, in at least one of the first array panel and the second array panel, the at least one sub-panel is fixedly connected or rotatably connected to the at least one reflective plate.

[0128] For example, the surface of the reflector facing the detected object OB may be a smooth metal surface, but the embodiments of the present disclosure are not limited thereto, as long as the reflectivity of the reflector reaches more than 90%. For example, a high-reflectivity paint, film or metal coating may be coated or attached to the bottom plate of the reflector.

[0129] In the embodiment of the present disclosure, in the first array panel 100A, the at least one sub-panel includes a first sub-panel 101A, and the at least one reflective plate includes a first reflective plate 201 .

[0130] In the second array panel 100B, the at least one sub-panel includes a second sub-panel 101B, and the at least one reflective plate includes a second reflective plate 202 .

[0131] Reference 9A to 9D, at least one of the first sub-panel 101A and the second sub-panel 101B may include the one-dimensional multiple-transmit multiple-receive antenna array as described above, the one-dimensional multiple-transmit multiple-receive antenna array includes a plurality of transmitting antennas arranged in a first row and a plurality of receiving antennas arranged in a second row, the plurality of transmitting antennas and the equivalent phase centers formed by the plurality of antennas are arranged in a third row and are spaced at equal intervals of half the wavelength of the detection signal, wherein the first row, the second row and the third row are parallel to each other. Reference may be made here to the above for Figure 2 Description.

[0132] In the case where the array panel includes a one-dimensional multiple-transmit multiple-receive antenna array, the one-dimensional multiple-transmit multiple-receive antenna array can be configured to be able to translate in the vertical plane in the up-down direction to implement scanning. For example, the one-dimensional multiple-transmit multiple-receive antenna array of the first sub-panel 101A moves from top to bottom in the vertical plane where it is located for scanning, and the one-dimensional multiple-transmit multiple-receive antenna array of the second sub-panel 101B moves from bottom to top in the vertical plane where it is located for scanning.

[0133] Continue to refer to Fig. 9A The security inspection device includes a first frame 401, and the first array panel 100A is arranged on the first frame 401 and can move up and down on the first frame 401, that is, move along the height direction. The security inspection device also includes a second frame 402, and the second array panel 100B is arranged on the second frame 402 and can move up and down on the second frame 402, that is, move along the height direction.

[0134] Reference Figures 10A to 11C , at least one of the first sub-panel 101A and the second sub-panel 101B includes a two-dimensional multi-transmit and multi-receive antenna array, and the two-dimensional multi-transmit and multi-receive antenna array includes multiple millimeter-wave transceiver units, and the multiple millimeter-wave transceiver units are arranged in an array along the first direction and the second direction. At least one of the multiple millimeter-wave transceiver units includes multiple transmitting antennas and multiple receiving antennas, the multiple transmitting antennas are arranged along the first direction, and the multiple receiving antennas are arranged along the second direction. The midpoint of the line connecting each transmitting antenna of the multiple transmitting antennas and a corresponding one of the multiple receiving antennas serves as an equivalent phase center, and the multiple transmitting antennas and the multiple receiving antennas are arranged so that the equivalent phase centers are arranged in a two-dimensional array. Reference may be made here to the above for FIG. 3A to FIG. 8D Description.

[0135] In the embodiments of the present disclosure, referring to Fig.9D , Figure 10A to Figure 10CIn each array panel, a reflector is arranged only on one side of the sub-panel. In these embodiments, the reflectors of the two array panels are arranged relative to the detected object OB, which is conducive to reflecting more rays to the detected object, thereby improving the imaging effect. In particular, the reflectors of the two array panels are arranged relative to the body side of the detected object OB, which can effectively solve the problem of poor imaging effect on the body side of the human body.

[0136] Reference Fig.9D , Figure 10A to Figure 10C The first sub-panels 101A are arranged along a first arrangement direction D1, which is parallel to the predetermined moving direction MD. The first reflective plates 201 are arranged along a third arrangement direction D3, which intersects the first arrangement direction D1 at a first predetermined angle α.

[0137] The second sub-panel 101B is arranged along a second arrangement direction D2, and the second arrangement direction D2 is parallel to the predetermined movement direction MD. The second reflector 202 is arranged along a fourth arrangement direction D4, and the fourth arrangement direction D4 intersects the second arrangement direction D2 at a second predetermined angle β. For example, the first predetermined angle is substantially equal to the second predetermined angle. For example, the first predetermined angle or the second predetermined angle may be between 10° and 80°, for example, between 30° and 60°, for example, about 30°.

[0138] Reference Fig.9D , Figure 10A to Figure 10C , the first reflecting plate 201 is arranged on the upstream side of the first sub-panel 101A along the predetermined moving direction MD; and the second reflecting plate 202 is arranged on the downstream side of the second sub-panel 101B along the predetermined moving direction MD.

[0139] In the embodiments of the present disclosure, referring to Fig.9D , Fig. 10A and Fig. 10B The first reflector 201 and the first sub-panel 101A may be fixedly connected so that the first predetermined angle remains unchanged. The second reflector 202 and the second sub-panel 101B may be fixedly connected so that the second predetermined angle remains unchanged.

[0140] Alternatively, in the embodiments of the present disclosure, referring to Fig. 10C The first reflector 201 is rotatably connected to the first sub-panel 101A, so that the first predetermined angle can be changed. The second reflector 202 is rotatably connected to the second sub-panel 101B, so that the second predetermined angle can be changed. In this case, the first predetermined angle can be substantially equal to the second predetermined angle.

[0141] In the embodiments of the present disclosure, referring to Figure 9A to Figure 9C , Figure 11A to Figure 11C , in each array panel, reflective plates can be arranged on both sides of the sub-panel.

[0142] On the basis of the above embodiment, in the first array panel 100A, the at least one reflective plate further includes a third reflective plate 203. The first reflective plate 201 and the third reflective plate 203 are respectively fixedly connected or rotatably connected to opposite sides of the first sub-panel 101A, the first sub-panel 101A is arranged along a first arrangement direction D1, the first reflective plate 201 is arranged along a third arrangement direction D3, and the third reflective plate 203 is arranged along a fifth arrangement direction D5, the first arrangement direction D1 is parallel to the predetermined moving direction MD, the third arrangement direction D3 intersects the first arrangement direction D1 at a first predetermined angle α, and the fifth arrangement direction D5 intersects the first arrangement direction D1 at a third predetermined angle γ.

[0143] In the second array panel 100B, the at least one reflective plate further includes a fourth reflective plate 204. The second reflective plate 202 and the fourth reflective plate 204 are respectively fixedly connected or rotatably connected to opposite sides of the second sub-panel 101B, the second sub-panel 101B is arranged along the second arrangement direction D2, the second reflective plate 202 is arranged along the fourth arrangement direction D4, and the fourth reflective plate 204 is arranged along the sixth arrangement direction D6, the second arrangement direction D2 is parallel to the predetermined moving direction MD, the fourth arrangement direction D4 intersects the second arrangement direction D2 at a second predetermined angle β, and the sixth arrangement direction D6 intersects the second arrangement direction D2 at a fourth predetermined angle θ.

[0144] Reference Figure 9A to Figure 9C , Fig.11A The first reflector 201 and the third reflector 203 are respectively fixedly connected to the first sub-panel 101A, so that the first predetermined angle and the third predetermined angle remain unchanged. The second reflector 204 and the fourth reflector 204 are respectively fixedly connected to the second sub-panel 101B, so that the second predetermined angle and the fourth predetermined angle remain unchanged.

[0145] Reference Figure 11B to Figure 11CThe first reflector 201 and the third reflector 203 are rotatably connected to the first sub-panel 101A, for example, the first reflector 201 and the third reflector 203 are rotatably connected to the first sub-panel 101A through the rotating shaft 503, so that the first predetermined angle and the third predetermined angle can be changed. The second reflector 204 and the fourth reflector 204 are rotatably connected to the second sub-panel 101B, so that the second predetermined angle and the fourth predetermined angle can be changed.

[0146] For example, the first predetermined angle is substantially equal to the second predetermined angle; and / or the third predetermined angle is substantially equal to the fourth predetermined angle.

[0147] Fig. 12A It is a schematic top view of security inspection equipment according to some other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in a closed state. Fig. 12B It is a schematic top view of security inspection equipment of other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in an open state. Fig. 12C It is a schematic top view of security inspection equipment according to some other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in a closed state. Fig.12D It is a schematic top view of security inspection equipment of other exemplary embodiments of the present disclosure, which schematically shows that the inspection channel is in an open state.

[0148] Combined with reference FIG. 12A to FIG. 12D , each of the first sub-panel 101A and the second sub-panel 101B has an arc shape. Each of the first sub-panel 101A and the second sub-panel 101B includes the one-dimensional multi-transmit multi-receive antenna array as described above, the one-dimensional multi-transmit multi-receive antenna array includes multiple transmitting antennas and multiple receiving antennas, and the multiple transmitting antennas and the equivalent phase centers formed by the multiple antennas are arranged in an arc.

[0149] For example, each of the first reflective plate 201 and the second reflective plate 202 has a curved surface. The first reflective plate 201 and the second reflective plate 202 can move relative to the first sub-panel 101A and the second sub-panel 101B, respectively, so that the security inspection device can be switched between an open state and a closed state. Fig. 12B and Fig.12D As shown, in the open state, the inlet and outlet of the detection channel are both open. Fig. 12A and Fig. 12C As shown, in the closed state, the inlet and outlet of the detection channel are both closed.

[0150] For example, refer to Fig. 12A and Fig. 12B The first reflecting plate 201 and the second reflecting plate 202 are rotatable relative to the first sub-panel 101A and the second sub-panel 101B, respectively. Fig. 12A As shown, the first reflective plate 201 can rotate inwardly relative to the first sub-panel 101A to close the entrance of the detection channel D. The second reflective plate 202 can rotate inwardly relative to the second sub-panel 101B to close the exit of the detection channel D. Fig. 12B As shown, the first reflective plate 201 can rotate outward relative to the first sub-panel 101A to open the entrance of the detection channel D. The second reflective plate 202 can rotate outward relative to the second sub-panel 101B to open the exit of the detection channel D.

[0151] For example, refer to Fig. 12C and Fig.12D The first reflecting plate 201 and the second reflecting plate 202 are respectively movable relative to the first sub-panel 101A and the second sub-panel 101B. Fig. 12C As shown, the first reflective plate 201 can move outward relative to the first sub-panel 101A to close the entrance of the detection channel D. The second reflective plate 202 can move outward relative to the second sub-panel 101B to close the exit of the detection channel D. Fig.12D As shown, the first reflective plate 201 can move inward relative to the first sub-panel 101A to open the entrance of the detection channel D. The second reflective plate 202 can move inward relative to the second sub-panel 101B to open the exit of the detection channel D.

[0152] For example, the first sub-panel 101A may include a first slide groove 501, and the first reflective plate 201 may be movable in the first slide groove 501. The second sub-panel 101B may include a second slide groove 502, and the second reflective plate 202 may be movable in the second slide groove 502.

[0153] In this embodiment, the reflective plate moves inward and outward relative to the sub-panel, which is beneficial to reducing the space occupied by the array panel, thereby facilitating reducing the size of the entire security inspection device.

[0154] Fig.13 1 is a schematic top view of security inspection equipment according to some other exemplary embodiments of the present disclosure, in which embodiments of line / surface arrays and cylindrical reflective plates are schematically shown.

[0155] Reference Fig.13 At least one of the first sub-panel 101A and the second sub-panel 101B includes the one-dimensional multi-transmit multi-receive antenna array or the two-dimensional multi-transmit multi-receive antenna array as described above. Each of the first reflector 201 and the second reflector 202 has a curved surface shape.

[0156] That is, in the embodiment of the present disclosure, the first sub-panel and the second sub-panel are planar in shape and arranged along a specified moving direction; the first reflective plate and the second reflective plate are cylindrical in shape and arranged along an arc.

[0157] For example, the arc surface has a center O1 and a radius R2. The radius R2 is 1 to 1.5 times the vertical distance R1 between the center O1 and the first sub-panel 101A.

[0158] In this embodiment, the reflector is a cylindrical reflector, whose radius R2 is selected to be 1-1.5 times of the imaging distance R1, and the height is the height of the surface array or the height of the line array scanning. Through such an arrangement, the light path reflected by the reflector can be better focused. In the above embodiments, the width of the first reflector 201 along the second arrangement direction D2 is between 0.5 and 0.7 of the width of the first sub-panel 101A along the first arrangement direction D1. The height of the first reflector 201 along the height direction is substantially equal to the height of the first sub-panel 101A along the height direction, and the height direction is perpendicular to both the second arrangement direction and the first arrangement direction.

[0159] The width of the second reflector 202 along the fourth arrangement direction D4 is between 0.5 and 0.7 of the width of the second sub-panel 101B along the second arrangement direction D2. The height of the second reflector 202 along the height direction is substantially equal to the height of the second sub-panel 101B along the height direction.

[0160] The width of the third reflective plate 203 along the fifth arrangement direction D5 is between 0.5 and 0.7 of the width of the first sub-panel 101A along the first arrangement direction D1.

[0161] The height of the third reflective plate 203 along the height direction is substantially equal to the height of the first sub-panel 101A along the height direction.

[0162] The width of the fourth reflective plate 204 along the sixth arrangement direction D6 is between 0.5 and 0.7 of the width of the second sub-panel 101B along the second arrangement direction D2.

[0163] The height of the fourth reflective plate 204 along the height direction is substantially equal to the height of the second sub-panel 101B along the height direction.

[0164] In this embodiment, one or two reflective plates are added to the side of the array panel to increase the irradiation area of ​​the millimeter wave without increasing the number of transmitting and receiving antennas, which can effectively solve the problem of poor imaging effect on the side of the human body.

[0165] For example, in the embodiments of the present disclosure, a direct drive motor, a stepper motor, a servo motor or other driving mechanism can be used to directly drive or drive through gears, synchronous belts, or chains to rotate the reflective plate relative to the sub-panel to which it is connected. The rotation structure and driving method can adopt various known rotation structures and driving methods, and the embodiments of the present disclosure do not impose any special restrictions on this.

[0166] Fig.14 FIG. 1 is a flow chart of a method for controlling a security inspection device according to some exemplary embodiments of the present disclosure. Fig.14 As shown, the control method of the security inspection equipment according to the exemplary embodiment of the present disclosure may include operations S310 to S330, and the control method of the security inspection equipment may be executed by a processor or by any control device including a processor.

[0167] In operation S310, the millimeter wave transceiver unit 20 is controlled to send a detection signal to the detected object.

[0168] In operation S320, the millimeter wave transceiver unit 20 is controlled to receive an echo signal from the detected object.

[0169] In operation S330, an image of the detected object is reconstructed according to the received echo signal.

[0170] In an embodiment of the present disclosure, reconstructing the image of the detected object based on the received echo signal may include: in response to different detection modes, selecting an image reconstruction algorithm corresponding to the detection mode; and using the selected image reconstruction algorithm to reconstruct the image of the detected object based on the received echo signal.

[0171] For example, in response to different detection modes, selecting the image reconstruction algorithm corresponding to the detection mode specifically includes: in response to the quick detection mode, selecting the real-time reconstruction algorithm corresponding to the quick detection mode; and in response to the fine detection mode, selecting the back-projection algorithm corresponding to the fine detection mode.

[0172] For example, the quick inspection mode can be applied to scenarios with high real-time requirements, such as subway stations. In the quick inspection mode, the person being inspected walks through the inspection channel at a normal walking speed. Fig. 8A , Figure 8C As shown, the person being tested basically does not stay in the detection channel, but directly passes through the detection channel at a normal walking speed. In the fast detection mode, a real-time reconstruction algorithm can be used to reconstruct the image.

[0173] For example, the detailed inspection mode can be applied to scenarios with high security inspection requirements, such as airport security inspection. In the detailed inspection mode, the person being inspected can be asked to stand still for 2-3 seconds, or asked to turn around, such as Fig. 7A , Figure 7B , Figure 8B , Fig.8D , Fig. 9A , Fig. 9C , Fig.9D , Figure 10A to Figure 13 In the fine inspection mode, the back-projection algorithm can be used to reconstruct the image.

[0174] In the embodiments of the present disclosure, the security inspection device can flexibly select a security inspection mode according to different application scenarios, and can expand the application scenarios of the security inspection device while ensuring the imaging effect.

[0175] Those skilled in the art should be aware that the above are merely examples, and the structure of the 2D MIMO millimeter wave transceiver module 11 disclosed in the present invention is not limited thereto, and the size of the subarray, the size of the array, the arrangement of antennas in the subarray, and the number of antennas can be adjusted as needed.

[0176] Fig.15 FIG. 1 is a schematic diagram showing the working principle of a 2D MIMO millimeter wave transceiver module according to an embodiment of the present disclosure. Fig.15 As shown, a 2D MIMO millimeter wave transceiver module including 4×4 millimeter wave transceiver units is described as an example, wherein each millimeter wave transceiver unit has a structure as shown in FIG3 , and the equivalent phase centers formed are arranged in an array form (also called an equivalent phase center network), (n x , n y ) represents the coordinates of the equivalent phase center in the array (equivalent phase center network). The central reference point of the imaging area 103 of the 2D MIMO millimeter wave transceiver module is represented by Indicates that the detected object contains the reference point located at the center When performing safety inspection, the 2DMIMO millimeter wave transceiver module can be controlled by electronic scanning.

[0177] As an example, the control circuit can control the transmitting antenna in each millimeter wave transceiver unit of the 2D MIMO millimeter wave transceiver module to transmit the detection signal in sequence, and the receiving antenna to receive the echo signal, and then switch to the next millimeter wave transceiver unit, and repeat the operation until the entire millimeter wave transceiver module scan is completed to obtain all scattering data of the detected object at different viewing angles. As another example, the control circuit can control all transmitting antennas in the 2D MIMO millimeter wave transceiver module to transmit the detection signal in sequence, and control all receiving antennas in the 2D MIMO millimeter wave transceiver module to receive the echo signal.

[0178] In an embodiment of the present disclosure, microwave millimeter waves with a frequency in the range of 10-300 GHz are used as detection signals. Waves in this band have no ionization damage to the human body and can be used for human security inspection. In an embodiment of the present disclosure, a 2D MIMO millimeter wave transceiver module includes multiple transmitting antennas and multiple receiving antennas arranged in a two-dimensional array, and operates in an electronic scanning manner. Electronic scanning has the advantage of fast detection speed, and combined with a three-dimensional holographic algorithm based on fast Fourier transform (FFT), real-time imaging can be achieved. A transmitting antenna and a corresponding receiving antenna in a 2D MIMO millimeter wave transceiver module can generate an equivalent phase center, and the echo data collected by a pair of transceiver antenna combinations can be equivalent to the echo collected by the self-transmitting and self-receiving antennas at the location of their equivalent phase center. The equivalent phase centers are arranged in an array, and the interval between adjacent equivalent phase centers is substantially half of the wavelength λ of the detection signal, which makes the entire equivalent behavior center array substantially full, and the sampling interval (i.e., the interval between equivalent phase centers) used by the applied imaging system is in the order of λ / 2, so that there is no artifact superposition in the generated image and a clearer image can be formed, thereby improving the speed of image processing.

[0179] For example, in the fast inspection mode, a real-time reconstruction algorithm such as a holographic reconstruction algorithm can be selected to reconstruct the image of the inspected object. In the real-time reconstruction algorithm, a synthetic aperture holographic algorithm based on fast Fourier transform can be combined, so that fast reconstruction can be achieved and imaging can be completed.

[0180] The holographic reconstruction algorithm can realize real-time reconstruction of the image of the detected object. The echo data collected by a pair of transmitting and receiving antenna combinations can be equivalent to the echo collected by the self-transmitting and self-receiving antennas at the location of their equivalent phase center. The signal processing device collects the echo data at the equivalent phase center. Assuming that the collected reflection data of the detected object is s(n x , n y ), use the following formula to correct the reflection data and get the corrected reflection data matrix:

[0181] ,

[0182] in is the uncorrected scattering data matrix, n x and n y is the position of the equivalent phase center in the equivalent phase center grid (i.e., the row and column index).

[0183] and The calculation formula is as follows,

[0184] ;and

[0185] .

[0186] in, represents a reference point representing the center of the imaging area, j represents an imaginary number, and k represents a space constant.

[0187] represents the set of reflections computed, in this case, sampling the detected object, which contains a localized Point scatterer at .

[0188] represents a calculated reflection set, where the calculated reflection set is obtained when sampling an equivalent phase center network of a multi-receive and multi-transmit aperture.

[0189] Then the scattering coefficient of the detected object is obtained by reconstructing using the two-dimensional Fourier transform algorithm:

[0190]

[0191] Where I(x, y) represents the scattering coefficient of the detected object, z0 represents the distance between the 2D MIMO array panel and the detected object, j represents an imaginary number, k is the propagation constant, k x , k y They are the spatial propagation constant; FFT 2D is the two-dimensional Fourier transform, IFFT 2D is the two-dimensional inverse Fourier transform.

[0192] After completing the two-dimensional aperture scanning, the collected echo data can be expressed as . Finally, combined with the synthetic aperture holography algorithm based on fast Fourier transform, fast reconstruction can be achieved to complete imaging. The purpose of the imaging algorithm is to invert the image of the detected object from the echo expression, that is, the scattering coefficient I(x, y) of the detected object. The synthetic aperture holography algorithm based on Fourier transform does not need to reconstruct the entire imaging area point by point, but takes advantage of the fast Fourier transform to reconstruct the correct imaging area at one time. Therefore, the algorithm can achieve fast scanning and fast image reconstruction, thereby realizing real-time imaging. The reconstructed image is displayed on the display device, and combined with the suspicious object alarm algorithm, an alarm is issued for the suspicious object.

[0193] For example, in the fine inspection mode, a back-projection algorithm may be selected to reconstruct an image of the inspected object.

[0194] Backprojection originated from computed tomography technology and is an accurate imaging algorithm based on time domain signal processing. The basic idea is to calculate the delay between each imaging point in the imaging area and the receiving and transmitting antennas, and coherently superimpose the contributions of all echoes to it to obtain the pixel value corresponding to the point in the image. In this way, the image of the imaging area can be obtained by performing coherent superposition processing on the entire imaging area point by point. The backprojection algorithm is naturally easy to implement parallel computing, so it is suitable for situations where the receiving antennas in multiple units receive reflected electromagnetic waves at the same time. Although it is necessary to reconstruct every point in the entire imaging interval, if the hardware in the processing system uses GPU or FPGA technology, the reconstruction time can be greatly reduced, and even real-time reconstruction can be achieved.

[0195] The reconstruction formula can be expressed as,

[0196]

[0197] in, is the scattering coefficient of the object to be measured, z a is the imaging distance, j is the imaginary unit, k is the propagation constant, The echo signal of the object to be tested is received by a pair of transmitting antenna-receiving antenna combination, (x t , y t ) is the transmitting antenna coordinate, (x r , y r ) is the coordinate of the receiving antenna, and z represents the distance between the 2D MIMO array panel and a certain fault of the object to be tested.

[0198] After step S330, other steps may 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 alarm. For example, the reconstructed image of the detected object may be compared with a pre-stored template. If the degree of match with the characteristic template of a certain suspect is greater than a preset threshold, it is determined that the object may contain the suspect, otherwise it is determined that the object does not contain the suspect. In some embodiments, the probability of containing the suspect may also be determined according to the degree of match. For example, a higher degree of match indicates a higher probability of containing the suspect, and a lower degree of match indicates a lower probability of containing the suspect. The alarm method includes but is not limited to screen display, audio alarm, vibration alarm, etc. The alarm level can also be set. For example, when the probability of containing the suspect is low, the alarm can be given by a lower volume sound or a weaker vibration. When the probability of containing the suspect is high, the alarm can be given by a higher volume sound or a stronger vibration.

[0199] In addition, the reconstructed image of the detected object and / or the above-mentioned judgment result can also be presented to the user through a display device. For example, after the image is reconstructed, the reconstructed image can be displayed on a display screen, and then the analysis result can be presented on the display screen; or after the image reconstruction and analysis comparison are completed, the reconstructed image and the judgment result can be presented on the display screen together. The presentation method of the judgment result (for example, which suspect may be contained, the probability of containing the suspect) can be selected according to needs. In addition to the above-mentioned presentation in the form of a picture on the display screen, it can also be presented in other ways such as audio and vibration. For example, the judgment result can be played in the form of voice, and the judgment result can also be indicated by the alarm volume or vibration strength of the alarm. For example, a high-volume alarm represents a high possibility of containing a suspect, and a low-volume alarm represents a low possibility of containing a suspect.

[0200] In an embodiment of the present disclosure, controlling the millimeter wave transceiver unit to send a detection signal to the detected object includes: controlling a portion of the plurality of millimeter wave transceiver units to send a detection signal to the detected object in sequence with a first prescribed step length.

[0201] The controlling the millimeter wave transceiver unit to receive the echo signal from the detected object includes: controlling a part of the plurality of millimeter wave transceiver units to sequentially receive the echo signal from the detected object at a second prescribed step length.

[0202] In an embodiment of the present disclosure, the security inspection equipment has an independent working mode and an associated working mode, the first prescribed step length in the associated working mode is half of the first prescribed step length in the independent working mode, and the second prescribed step length in the associated working mode is half of the second prescribed step length in the independent working mode.

[0203] Combined with reference Figure 6C , Fig. 7A , at least one of the first array panel 100A and the second array panel 100B includes: a millimeter wave transceiver modules arranged along a specified moving direction, 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, as a whole, a plurality of millimeter wave transceiver modules 30 are arranged in an array form of n rows and 4m columns. For example, m=1, n=4.

[0204] In the independent working mode, each millimeter wave transceiver module 30 works independently of each other.

[0205] For example, under the independent working 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 detected object, 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 an echo signal from the detected object, wherein 1≤i≤b, 1≤j<a, i and j are both positive integers; then, j is increased by 1, and the above-mentioned first independent control step is executed cyclically until j=a.

[0206] For another example, under the independent working 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 a detection signal to the detected object, 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 an echo signal from the detected object, wherein 1≤i<b, 1≤j≤a, i and j are both positive integers; then, i is increased by 1, and the above second independent control step is executed cyclically until i=b.

[0207] Combined with reference Figure 6C , Fig. 7A , in the independent working mode, all the millimeter wave transceiver units 20 (for example, four millimeter wave transceiver units 20) in the millimeter wave transceiver module located in the first row and the first column (for example, a millimeter wave transceiver module 30 located in the upper left corner) are controlled to send a detection signal to the detected object, and accordingly, all the millimeter wave transceiver units 20 in the millimeter wave transceiver module 30 located in the first row and the first column are controlled to receive an echo signal from the detected object. Then, j is increased by 1, that is, all the millimeter wave transceiver units 20 (for example, four millimeter wave transceiver units 20) in the millimeter wave transceiver module 30 located in the first row and the second column are controlled to send a detection signal to the detected object, and accordingly, all the millimeter wave transceiver units 20 in the millimeter wave transceiver module 30 located in the first row and the second column are controlled to receive an echo signal from the detected object. For the millimeter wave transceiver modules in the first row, the first independent control step is performed in sequence until stepping to the last millimeter wave transceiver module 30 in the first row. That is to say, in the independent working mode, one millimeter wave transceiver module is stepped forward each time along the specified moving direction MD.

[0208] After all the millimeter wave transceiver modules 30 in the first row have completed scanning, further scanning may be performed along the height direction HD.

[0209] For example, in the independent working mode, all the millimeter wave transceiver units 20 (for example, 4 millimeter wave transceiver units 20) in the millimeter wave transceiver module 30 located in the second row and the first column are controlled to send a detection signal to the detected object, and accordingly, all the millimeter wave transceiver units 20 in the millimeter wave transceiver module 30 located in the second row and the first column are controlled to receive the echo signal from the detected object. Then, j is increased by 1, that is, all the millimeter wave transceiver units 20 (for example, 4 millimeter wave transceiver units 20) in the millimeter wave transceiver module 30 located in the second row and the second column are controlled to send a detection signal to the detected object, and accordingly, all the millimeter wave transceiver units 20 in the millimeter wave transceiver module 30 located in the second row and the second column are controlled to receive the echo signal from the detected object. For the millimeter wave transceiver modules in the second row, the first independent control step is performed in sequence until the last millimeter wave transceiver module 30 in the second row is stepped. That is, in the independent working mode, one millimeter wave transceiver module is stepped in the height direction HD at a time.

[0210] That is, in the independent working mode, for each row of millimeter wave transceiver modules 30, the millimeter wave transceiver modules 30 are controlled one by one along the specified moving direction with a step length of one millimeter wave transceiver module to transmit millimeter waves and receive echoes; after the scanning of a row of millimeter wave transceiver modules 30 is completed, the millimeter wave transceiver modules 30 in the next row are controlled in the height direction with a step length of one millimeter wave transceiver module, and for the millimeter wave transceiver modules in the next row, the millimeter wave transceiver modules 30 are controlled one by one along the specified moving direction with a step length of one millimeter wave transceiver module, and so on, until the scanning of the last millimeter wave transceiver module 30 in the last row is completed. In this way, a complete scan is completed, and then the image of the detected object can be reconstructed according to the echo signals received during a complete scan.

[0211] In the associated working mode, the millimeter wave transceiver modules 30 work in association with each other.

[0212] For example, each millimeter wave transceiver module includes: 2c millimeter wave transceiver units arranged along a specified moving direction, and 2d millimeter wave transceiver units arranged along a height direction. Figure 6C , Fig. 7A In the embodiment shown, c=1, d=1.

[0213] Under the associated working mode, the control method may include: a first associated control step: controlling the millimeter wave transceiver unit located at the pth row and the qth column and at the p+1th row and the qth column to send a detection signal to the detected object, and controlling the millimeter wave transceiver unit located at the pth row and the qth column, at the p+1th row and the q+1th column, to receive an echo signal from the detected object, wherein 1≤p≤2bd, 1≤q<2ac, and p and q are both positive integers; then, increasing q by 1, and cyclically executing the above-mentioned first associated control step until q=2ac.

[0214] Under the associated working mode, the control method may include: a second associated control step: controlling the millimeter wave transceiver unit located at the pth row and the qth column and at the p+1th row and the qth column to send a detection signal to the detected object, and controlling the millimeter wave transceiver unit located at the pth row and the qth column, at the p+1th row and the q+1th column, to receive an echo signal from the detected object, wherein 1≤p<2bd, 1≤q≤2ac, and p and q are both positive integers; then, increasing p by 1, and cyclically executing the above second associated control step until p=2bd.

[0215] Combined with reference Figure 6C , Fig. 7A In the associated working mode, the millimeter wave transceiver units 20 located at the first row and the first column and the second row and the first column (for example, the two millimeter wave transceiver units 20 located at the upper left corner) are controlled to send a detection signal to the detected object, and accordingly, the four millimeter wave transceiver units 20 located at the first row and the first column, the second row and the first column, the second row and the first column, and the second row and the second column (that is, the four millimeter wave transceiver units of a millimeter wave transceiver module located at the upper left corner) are controlled to receive the echo signal from the detected object. Then, q is increased by 1, that is, the millimeter wave transceiver units 20 located at the first row and the second column and the second row and the second column (for example, the two millimeter wave transceiver units 20) are controlled to send a detection signal to the detected object, and accordingly, the four millimeter wave transceiver units 20 located at the first row and the second column, the second row and the third column, the first row and the third column, are controlled to receive the echo signal from the detected object. For the millimeter wave transceiver modules in the first row, the first association control step is performed in sequence until the last millimeter wave transceiver module 30 in the first row is stepped. That is, in the association working mode, half a millimeter wave transceiver module is stepped each time along the specified moving direction MD.

[0216] After the millimeter wave transceiver units 20 in all the millimeter wave transceiver modules 30 in the first row have completed scanning, further scanning may be performed along the height direction HD.

[0217] For example, in the associated working mode, the millimeter wave transceiver units 20 (for example, two millimeter wave transceiver units 20) located at the 2nd row, the 1st column, and the 3rd row, the 1st column are controlled to send a detection signal to the detected object, and accordingly, the four millimeter wave transceiver units 20 located at the 2nd row, the 1st column, the 3rd row, the 2nd column, and the 3rd row, the 2nd column are controlled to receive the echo signal from the detected object. Then, q is increased by 1, that is, the millimeter wave transceiver units 20 (for example, two millimeter wave transceiver units 20) located at the 2nd row, the 2nd column, and the 3rd row, the 2nd column are controlled to send a detection signal to the detected object, and accordingly, the four millimeter wave transceiver units 20 located at the 2nd row, the 2nd column, the 3rd row, the 2nd column, and the 3rd row, the 3rd column are controlled to receive the echo signal from the detected object. That is, in the associated working mode, half a millimeter wave transceiver module is stepped along the specified moving direction MD each time.

[0218] That is to say, in the associated working mode, for each row of millimeter wave transceiver modules 30, half of the millimeter wave transceiver units 20 in the millimeter wave transceiver module 30 are controlled to transmit millimeter waves along the specified moving direction with a step length of half a millimeter wave transceiver module, and the half of the millimeter wave transceiver unit 20 and the other half of the millimeter wave transceiver unit 20 adjacent to it are controlled to receive echoes; after the scanning of a row of millimeter wave transceiver modules 30 is completed, the step length of half a millimeter wave transceiver module is moved along the height direction to scan the next row. And so on, until the scanning of half of the millimeter wave transceiver units 20 in the last millimeter wave transceiver module 30 in the last row is completed. In this way, a complete scan is completed, and then the image of the detected object can be reconstructed according to the echo signals received during a complete scan.

[0219] In the associated working mode, scanning is performed one by one with a step length of half a millimeter wave transceiver module, which can increase the amount of data without increasing the number of transceiver antennas, thereby facilitating improved imaging effects.

[0220] Combined with reference Figure 6C , Fig. 7A, the splicing line 101S of the first sub-panel 101 and the second sub-panel 102 is facing the body side of the detected object, for example, the arm side of the detected object. In the associated working mode, when the millimeter wave transceiver units 20 (for example, two millimeter wave transceiver units 20) located in the first row and the second column and the second row and the second column are controlled to send a detection signal to the detected object, the four millimeter wave transceiver units 20 located in the first row and the second column, the second row and the second column, the first row and the third column, and the second row and the third column are controlled to receive the echo signal from the detected object. That is, the two columns of millimeter wave transceiver units 20 located on both sides of the splicing line 101S and adjacent to the splicing line 101S both receive the echo signal from the detected object. At this time, a large number of echo signals reflected by the body side of the detected object are received by the two columns of millimeter wave transceiver units 20. In this way, it is beneficial to detect the body side of the detected object, and the problem of poor imaging effect on the body side of the human body can be further effectively solved.

[0221] Reference Figure 6C , Figure 8B , Fig.8D and Fig. 9C , each of the first array panel 100A and the second array panel 100B includes a heart rate detection device 40, and the installation height of the heart rate detection device 40 is configured to be suitable for detecting the heart rate of the detected human body. That is to say, in the security inspection equipment according to the embodiment of the present disclosure, two heart rate detection devices are provided. For example, the heart rate detection device can adopt radars such as single-frequency Doppler radar, frequency modulated continuous wave (FMCW) radar, among which FMCW radar has better anti-clutter capability. It should be noted that how to detect the position change of the front chest or back, that is, to detect small displacement by a heart rate detection device such as FMCW radar, can refer to the introduction in the relevant technology, which will not be repeated here.

[0222] In the embodiment of the present disclosure, in order to avoid mutual interference, the two heart rate detection devices may use different working frequency bands.

[0223] Fig.16 FIG. 1 is a flow chart of a control method of a security inspection device according to some other exemplary embodiments of the present disclosure. Fig.16 As shown, the control method of the security inspection equipment according to the exemplary embodiment of the present disclosure may include operations S410 to S430, and the control method of the security inspection equipment may be executed by a processor or by any control device including a processor.

[0224] In operation S410, first heart rate information of the heart rate detection device 40 in the first array panel 100A is acquired.

[0225] In operation S320, second heart rate information of the heart rate detection device 40 in the second array panel 100B is acquired.

[0226] In operation S330, the heart rate of the detected human body is determined according to the first heart rate information and the second heart rate information.

[0227] For example, during heart rate detection, the detected person faces the first array panel 100A and has his back to the second array panel 100B.

[0228] In operation S330, determining the heart rate of the detected person 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 person.

[0229] Fig.17 Schematic diagram of a heart rate signal obtained by a security inspection device according to an embodiment of the present disclosure. Fig.17 The heart rate detection device 40 on the front panel (eg, the first array panel 100A) detects the position change of the chest of the subject (eg, Fig.17 The position change of the subject's chest is caused by both breathing movement and heartbeat vibration, and the position change caused by heartbeat is about one order of magnitude smaller than the position change caused by breathing. The heart rate detection device 40 on the back panel (such as the second array panel 100B) measures the position change of the subject's back (such as Fig.17 The position change of the back of the subject is basically caused by breathing movement, and its change amplitude is weaker than that of the chest. Therefore, simply scale the position change of the back, and then subtract the position change of the back from the position change of the chest to get the position change corresponding to the heartbeat (such as Fig.17 ). Fig.17 The X-shaped data points in the image can be processed simply to determine the heart rate of the person being tested (i.e., how many times the heart beats per minute).

[0230] In the embodiments of the present disclosure, by providing dual heart rate detection devices, the position changes of the chest and back of the subject can be detected respectively, so that a more accurate heart rate value can be obtained.

[0231] In an embodiment of the present disclosure, by obtaining a more accurate heart rate value, the emotional state of the person being tested can be determined based on the more accurate heart rate value. For example, when the heart rate value of the person being tested is high, such as higher than the heart rate threshold, it can be determined that the person being tested is in a state of tension. In this case, it can be determined that the possibility that the person being tested is carrying a suspicious object is high. That is to say, in an embodiment of the present disclosure, the obtained heart rate value can be used as one of the auxiliary judgment factors for security inspection, which is conducive to improving the accuracy of security inspection.

[0232] Those skilled in the art can understand that the embodiments described above are exemplary and can be improved by those skilled in the art. The structures described in various embodiments can be freely combined without causing conflicts in structure or principle.

[0233] After describing the preferred embodiments of the present disclosure in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the appended claims, and the present disclosure is not limited to the implementation methods of the exemplary embodiments listed in the specification.

Claims

1. A security inspection device, characterized in that: include: A detection channel, wherein the detection channel is configured to allow a detected object to pass through the security inspection device along a predetermined moving direction; The first array panel for millimeter wave transceiver; as well as a second array panel for millimeter wave transceiver, wherein the first array panel and the second array panel are respectively arranged on opposite sides of the detection channel in a direction perpendicular to the predetermined moving direction, Wherein, at least one of the first array panel and the second array panel comprises: at least one subpanel for millimeter wave transceiver; and at least one reflector for reflecting millimeter waves, wherein, in at least one of the first array panel and the second array panel, the at least one sub-panel is movably connected to the at least one reflective plate; Wherein, in the first array panel, the at least one sub-panel includes a first sub-panel, and the at least one reflective plate includes a first reflective plate; and In the second array panel, the at least one sub-panel includes a second sub-panel, and the at least one reflective plate includes a second reflective plate; Wherein, each of the first reflective plate and the second reflective plate has a curved surface shape; The first reflective plate and the second reflective plate can move relative to the first sub-panel and the second sub-panel respectively, so that the security inspection device can be switched between an open state and a closed state, wherein in the open state, the entrance and the exit of the detection channel are both open, and in the closed state, the entrance and the exit of the detection channel are both closed; Wherein, the first reflective plate and the second reflective plate are push-pull movable relative to the first sub-panel and the second sub-panel respectively; Wherein, the first sub-panel comprises a first slide groove, and the first reflective plate can move in the first slide groove; and / or, the second sub-panel comprises a second slide groove, and the second reflective plate can move in the second slide groove.

2. The security inspection equipment according to claim 1, characterized in that: The first reflecting plate is arranged on an upstream side of the first sub-panel along the predetermined moving direction; and The second reflection plate is arranged on a downstream side of the second sub-panel along the predetermined moving direction.

3. The security inspection equipment according to claim 1, characterized in that: At least one of the first sub-panel and the second sub-panel includes a one-dimensional multiple-transmit multiple-receive antenna array, the one-dimensional multiple-transmit multiple-receive antenna array includes a plurality of transmitting antennas arranged in a first row and a plurality of receiving antennas arranged in a second row, the plurality of transmitting antennas and the equivalent phase centers formed by the plurality of antennas are arranged in a third row and are spaced apart at equal intervals of one-half the wavelength of the detection signal, wherein the first row, the second row and the third row are parallel to each other.

4. The security inspection device according to claim 1, characterized in that: Each of the first sub-panel and the second sub-panel has a curved shape; and Each of the first sub-panel and the second sub-panel includes a one-dimensional multi-transmit multi-receive antenna array, which includes multiple transmitting antennas and multiple receiving antennas. The equivalent phase centers formed by the multiple transmitting antennas and the multiple antennas are arranged in an arc.

5. The security inspection equipment according to claim 3, characterized in that: The security inspection equipment also includes: a first frame, the first array panel being arranged on the first frame and being movable in a height direction on the first frame; and A second frame, wherein the second array panel is arranged on the second frame and can move along a height direction on the second frame.

6. The security inspection equipment according to claim 1, characterized in that: At least one of the first sub-panel and the second sub-panel includes a two-dimensional multi-transmit and multi-receive antenna array, the two-dimensional multi-transmit and multi-receive antenna array includes a plurality of millimeter wave transceiver units, and the plurality of millimeter wave transceiver units are arranged in an array along a first direction and a second direction; At least one of the multiple millimeter wave transceiver units includes multiple transmitting antennas and multiple receiving antennas, the multiple transmitting antennas are arranged along a first direction, the multiple receiving antennas are arranged along a second direction, the midpoint of a line connecting each of the multiple transmitting antennas and a corresponding one of the multiple receiving antennas serves as an equivalent phase center, and the multiple transmitting antennas and the multiple receiving antennas are arranged so that the equivalent phase centers are arranged in a two-dimensional array.

7. The security inspection device according to claim 1, characterized in that: At least one of the first sub-panel and the second sub-panel includes a one-dimensional multi-transmit multi-receive antenna array or a two-dimensional multi-transmit multi-receive antenna array.

8. The security inspection equipment according to claim 7, characterized in that: The arc surface has a center and a radius; The radius is 1 to 1.5 times the vertical distance between the center of the circle and the first sub-panel.

9. The security inspection device according to claim 1, characterized in that: The at least one sub-panel comprises a heart rate detection device, and the heart rate detection device is used to detect the heart rate of a detected human body.

Images