3D special-shaped planar aperture holographic imaging security radar

Abstract

The present invention relates to the field of security inspection, and in particular to the use of millimeter-wave holographic imaging technology for security inspection. Specifically, a three-dimensional, special-shaped planar aperture holographic imaging security inspection radar is provided. The security inspection radar includes a distributed antenna subsystem, a multi-subband transceiver subsystem, a data acquisition and recording subsystem, a servo motion subsystem, and an industrial control and processing subsystem. The distributed antenna subsystem includes at least two linear antenna arrays, and the servo motion subsystem is used to drive the distributed antenna subsystem to move in a vertical direction so that the at least two linear antenna arrays form a three-dimensional, special-shaped planar aperture. The present invention can avoid the process of multiple different types of security inspections, simplify the security inspection steps, and reduce the time it takes for the system to acquire data; it enables the system to acquire multi-directional and multi-angle data information, improves the modularity of the system, further enhances the scalability of the entire system, and enhances the system's usability and adaptability to detection environments.

Description

Technical field:

[0001] The present invention relates to the field of security inspection, in particular to security inspection using millimeter wave holographic imaging technology, and specifically provides a three-dimensional special-shaped plane aperture holographic imaging security inspection radar. Background technology:

[0002] With the development of society and the economy, public transportation hubs such as airports, train stations, subways, and bus stations are experiencing increasing passenger and logistics traffic. The security level in these areas must not only eliminate potential safety hazards to ensure public safety, but also meet the requirements of high detection efficiency for rapid transit. Traditional security technologies such as video surveillance, facial recognition, body temperature detection, metal detection, and X-ray imaging are gradually failing to meet these requirements. In recent years, developed countries in Europe and the United States have gradually adopted millimeter-wave holographic imaging technology for airport security checks, especially for passenger personal screening. This technology can quickly detect whether the material of the object being inspected is metal or non-metal, solid or liquid, and can even detect packaged hazardous gases. Furthermore, the inspection process does not require physical contact with the passenger, nor does it require the passenger to remove their coat or turn around, greatly improving the comfort and efficiency of security checks.

[0003] Millimeter-wave holographic imaging technology utilizes the coherence principle of electromagnetic waves, collects spatial interference fringes, records the diffraction pattern of each scattering point on the target, and finally obtains the millimeter-wave image of the target through image reconstruction. It has the characteristics of penetrating imaging, high resolution, and low radiation. At present, research institutions and enterprises in various countries in the world have maintained long-term and close attention to this technology. For example, patent CN201010598647.0 discloses a millimeter-wave transceiver module for a holographic imaging security inspection system, including a millimeter-wave RF transceiver front end working in the millimeter-wave frequency band, a millimeter-wave transceiver switch tree array working in the millimeter-wave frequency band, and a millimeter-wave transceiver antenna array working in the millimeter-wave frequency band, wherein the millimeter-wave transceiver switch tree array is connected to the millimeter-wave RF transceiver front end and the millimeter-wave transceiver antenna array at the front and back respectively. For another example, patent CN201110334768.9 discloses a millimeter-wave active three-dimensional holographic imaging human body security inspection system, including a cylindrical main frame with an entrance and exit, a first millimeter-wave transceiver switch tree array, and a millimeter-wave transceiver antenna array working in the millimeter-wave frequency band. A millimeter-wave transceiver, a second millimeter-wave transceiver, a first millimeter-wave switch antenna array connected to the first millimeter-wave transceiver, a second millimeter-wave switch antenna array connected to the second millimeter-wave transceiver, a rotary scanning drive device, a control device, and a parallel image processing device. The parallel image processing device is configured to synthesize a three-dimensional holographic image of the person to be inspected based on the collected data from the first and second millimeter-wave transceivers and the spatial position information of the collected data. For example, patent CN201610046575.6 discloses a millimeter-wave holographic three-dimensional imaging detection system. The millimeter-wave holographic three-dimensional imaging detection system includes a transmitting antenna, a receiving antenna, a millimeter-wave transceiver module, a scanning device, a data acquisition and processing module, and an image display unit. The system exemplifies that a single row of millimeter-wave transceiver systems can include 64 millimeter-wave transceiver modules and 128 antennas, offering advantages such as shortened imaging time and a larger field of view. For example, patent CN201720657908 discloses a millimeter-wave holographic three-dimensional imaging detection system.9 discloses a millimeter-wave holographic imaging security inspection system for a moving walkway, comprising a millimeter-wave switch array radar, a moving walkway, and an automatic handrail. The millimeter-wave switch array radar is provided with one or more millimeter-wave switch array radars and is vertically arranged on both sides of the moving walkway. The automatic handrail is arranged above the moving walkway in a closed ring structure. The millimeter-wave switch array radar scans and detects human bodies on the moving walkway. The millimeter-wave switch array radar includes an antenna array, a switch matrix, a transmitter, a receiver, an A / D acquisition, and an imaging processor. The security inspection system requires two millimeter-wave switch array radars to be installed opposite each other. Radar can achieve double-sided human body stereo imaging in a single scan without the person being inspected turning around; these conventional existing technologies have the following disadvantages: they are mainly based on radar data acquisition, which is difficult to integrate with video surveillance, face recognition, human body temperature detection, and metal detection, and cannot achieve the fusion between radar images and optical images. It is impossible to conduct all-round monitoring of passengers, and passengers need to turn 180 degrees during security inspection. The security inspection process is cumbersome, the detection efficiency is relatively low, and its application in fast-flowing areas is limited; the entire signal bandwidth is swept or modulated for data acquisition, which is limited by the radar signal bandwidth and signal modulation time. Due to the influence of multiple aspects such as time, modulation frequency linearity, etc., the actual data acquisition time is relatively long, and with the improvement of resolution and time response time requirements, it has developed to a bottleneck; the observation angle is relatively single, and the human body surface and appendages can only be imaged at a certain equivalent observation angle, and it is difficult to obtain targets on the side of the human body, and the algorithm can only be used for conventional single-plane aperture imaging; the three-dimensional image of the observed target is obtained by using adjacent array elements equivalently, which increases the number of channels of the system. Taking 1024-point equivalent sampling as an example, the number of physical units required is 1024. With the improvement of resolution and observation range, the number of array elements and their radio frequency The number of channels will increase significantly, and issues such as system cost reduction will become increasingly prominent. The need to maintain uniform motion increases the difficulty of system control and the weight of the system due to stability requirements. At the same time, conventional imaging systems suffer from a series of problems, such as single-time control, difficulty in cross-validation, and frequent data loss. The modularity of security imaging is relatively low, and there is an urgent need to consider system integration. In the process of security imaging target recognition, the number of prediction frames extracted by the neural network model is huge, the computational complexity is high, and the extraction process is difficult to obtain sufficient semantic information, which is not conducive to target detection and recognition. Summary of the invention:

[0004] The technical problem to be solved by the present invention is to provide a three-dimensional special-shaped planar aperture holographic imaging security inspection radar in response to the shortcomings of the existing technology, such as low security inspection efficiency, inability to achieve fusion between radar images and optical images, and low degree of modularization of security inspection imaging.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a three-dimensional special-shaped planar aperture holographic imaging security inspection radar, which is used to inspect observation targets in the security inspection channel, includes a distributed antenna subsystem, a multi-subband transceiver subsystem, a data acquisition and recording subsystem, a servo motion subsystem and an industrial control and processing subsystem, and is characterized by:

[0006] The distributed antenna subsystem includes at least two linear antenna arrays, which are used to convert received electrical excitation signals into electromagnetic waves, and then transmit the electromagnetic waves as transmission signals and receive echo signals;

[0007] The multi-sub-band transceiver subsystem is communicatively connected to the distributed antenna subsystem, and the multi-sub-band transceiver subsystem is used to generate an electrical excitation signal and receive an echo signal, and perform multi-sub-band demodulation on the echo signal to generate an analog video signal;

[0008] The data acquisition and recording subsystem is in communication with the multi-sub-band transceiver subsystem, and the data acquisition and recording subsystem is used to perform analog-to-digital conversion sampling and recording on the analog video signal to form radar echo data;

[0009] The servo motion subsystem is used to drive the distributed antenna subsystem to move in a vertical direction so that the at least two linear antenna arrays form a three-dimensional special-shaped planar aperture in space; before the distributed antenna subsystem moves in the vertical direction, at least one linear antenna array is at the highest point of the three-dimensional special-shaped planar aperture, and at least another linear antenna array is at the lowest point of the three-dimensional special-shaped planar aperture;

[0010] The industrial control and processing subsystem is in communication with the data acquisition and recording subsystem, and the industrial control and processing subsystem processes the received radar echo data to obtain a detection image.

[0011] Furthermore, the distributed antenna subsystem includes a first linear antenna array and a second linear antenna array, which are symmetrically distributed on both sides of the security inspection channel. The first linear antenna array includes a first sparse sub-array, a second sparse sub-array, and a third sparse sub-array connected in sequence. The second linear antenna array includes a fourth sparse sub-array, a fifth sparse sub-array, and a sixth sparse sub-array connected in sequence. Each sparse sub-array includes multiple transmitting array elements and multiple receiving array elements.

[0012] Furthermore, the first sparse sub-array, the second sparse sub-array, the third sparse sub-array, the fourth sparse sub-array, the fifth sparse sub-array, and the sixth sparse sub-array are symmetrically distributed on both sides of the security inspection channel. The lengths of the first sparse sub-array and the fourth sparse sub-array are equal, the lengths of the second sparse sub-array and the fifth sparse sub-array are equal, and the lengths of the third sparse sub-array and the sixth sparse sub-array are equal.

[0013] Furthermore, each linear antenna array includes three sparse sub-arrays, and each sparse sub-array includes a plurality of transmitting array elements and a plurality of receiving array elements.

[0014] Preferably, the angle between two adjacent sparse sub-arrays of each linear antenna array is θ, and the range of θ is 90° to 180°.

[0015] Preferably, the layout of the transmitting array elements and the receiving array elements of the three sparse sub-arrays of each linear antenna array is the same.

[0016] Preferably, the number of transmitting array elements in each linear antenna array is equal to the number of receiving array elements, multiple transmitting array elements are arranged in a line in the horizontal direction, multiple receiving array elements are arranged in a line in the horizontal direction, multiple transmitting array elements are located above multiple receiving array elements in the vertical direction, the distance between two adjacent transmitting array elements or two adjacent receiving array elements is s, and the distance between any transmitting array element and an adjacent receiving array element in the horizontal direction is s / 2.

[0017] Preferably, each sparse sub-array includes a plurality of transmit array element groups and a plurality of receive array element groups, wherein the transmit array element groups and the receive array element groups are arranged in a line in the horizontal direction and are alternately distributed, each transmit array element group includes at least one transmit array element, and each receive array element group includes at least one receive array element.

[0018] Preferably, each sparse sub-array includes multiple transmit array element groups and multiple receive array element groups, the multiple transmit array element groups are arranged in a line in the horizontal direction, the multiple receive array element groups are arranged in a line in the horizontal direction, the multiple receive array element groups are located above the multiple transmit array element groups in the vertical direction, a receive array element group is distributed between two adjacent transmit array element groups, each transmit array element group includes at least one transmit array element, and each receive array element group includes at least one receive array element.

[0019] Preferably, each sparse subarray forms a planar aperture, and the planar apertures formed by all sparse subarrays constitute a polygonal three-dimensional special-shaped planar aperture, and the height of the three-dimensional special-shaped planar aperture is equal to the maximum distance that the linear antenna array moves in the vertical direction.

[0020] More preferably, the height of the three-dimensional special-shaped plane aperture is 0.2 to 3 meters.

[0021] More preferably, the length of one of the three sparse sub-arrays of each linear antenna array is 0.1-1.2 m, and the lengths of the other two sparse sub-arrays are 0.1-1 m.

[0022] More preferably, the three-dimensional special-shaped planar aperture can achieve height resolution, array resolution and distance resolution.

[0023] Furthermore, the three-dimensional special-shaped planar aperture holographic imaging security radar also includes a high-speed switch network subsystem, which is communicatively connected to the distributed antenna subsystem and the multi-sub-band transceiver subsystem. The high-speed switch network subsystem is used to open the transmission channel and the receiving channel, and transmit the electrical excitation signal and the echo signal between the distributed antenna subsystem and the multi-sub-band transceiver subsystem.

[0024] Furthermore, the three-dimensional special-shaped planar aperture holographic imaging security radar also includes a central electronic equipment subsystem, which is communicatively connected to the high-speed switch network subsystem, the multi-sub-band transceiver subsystem and the data acquisition and recording subsystem. On the one hand, the central electronic equipment subsystem is used to generate timing trigger pulses that trigger the operation of the multi-sub-band transceiver subsystem and the data acquisition and recording subsystem; on the other hand, it is used to control the high-speed switch network subsystem to complete switch switching under its set control logic; the central electronic equipment subsystem is also used to preprocess the radar echo data in the data acquisition and recording subsystem, and the preprocessed radar echo data is returned to the data acquisition and recording subsystem.

[0025] Furthermore, the three-dimensional special-shaped planar aperture holographic imaging security radar also includes a high-speed data exchange subsystem, which is communicatively connected to the data acquisition and recording subsystem. The high-speed data exchange subsystem is used to transmit the radar echo data in the data acquisition and recording subsystem to the industrial control and processing subsystem; data retransmission instructions can also be transmitted between the data acquisition and recording subsystem and the high-speed data exchange subsystem.

[0026] Furthermore, the three-dimensional special-shaped planar aperture holographic imaging security radar also includes a multi-source sensor subsystem, which includes a temperature measurement subsystem, a metal detection subsystem and a three-dimensional point cloud measurement subsystem, which is used to provide temperature measurement data, metal detection data, and human target three-dimensional point cloud data to the industrial control and processing subsystem.

[0027] Furthermore, the temperature measurement subsystem is a human infrared sensor, and the three-dimensional point cloud measurement subsystem includes a plurality of cameras, and the plurality of cameras are distributed in a line in the linear antenna array.

[0028] Furthermore, the three-dimensional special-shaped planar aperture holographic imaging security radar also includes a mechanical structure subsystem, a power supply protection subsystem and a monitoring center subsystem. The mechanical structure subsystem is used to provide mechanical structure support for other subsystems, the power supply protection subsystem is used to provide power supply and power supply protection for each subsystem, and the monitoring center subsystem is communicatively connected with the industrial control and processing subsystem, and the monitoring center subsystem is used to provide a comprehensive display of multi-system status and results.

[0029] Furthermore, the industrial control and processing subsystem includes a full-system control subsystem, a portable control subsystem, a one-button operation subsystem and an automatic sensing subsystem. The system operation is controlled by the portable control subsystem, the one-button operation subsystem or the automatic sensing subsystem. The full-system control subsystem is capable of data processing. The portable control subsystem is a mobile terminal, and the automatic sensing subsystem is a sensor for detecting people entering the system.

[0030] Furthermore, the three-dimensional special-shaped planar aperture holographic imaging security radar also includes a communication control subsystem, which is communicatively connected to the industrial control and processing subsystem, and the communication control subsystem is used to complete the distribution of data between subsystems in the industrial control and processing subsystem.

[0031] The present invention integrates radar detection, video surveillance, face recognition, human body temperature detection, and metal detection functions into one, which can avoid the process of multiple different types of security checks and simplify the security inspection steps; adopts a simultaneous 2-transmit 2-receive method of multiple sub-bands to reduce the time the system takes to acquire data; adopts a special-shaped planar aperture layout method, so that the system can obtain multi-directional and multi-angle data information, which is of great significance to improving the detection rate of foreign objects; adopts a modular composition method, through the control and communication settings, it can flexibly add other detection modules or sensors according to actual needs, thereby improving the modularity of the system, further improving the scalability of the entire system, and enhancing the system's availability and adaptability to the detection environment. Description of the drawings:

[0032] Figure 1 This is a schematic structural diagram of the three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to the present invention;

[0033] Figure 2 for Figure 1 A partial enlarged schematic diagram of the distributed antenna subsystem, high-speed switch network subsystem, and servo motion subsystem;

[0034] Figure 3 is a schematic top view of the distributed antenna subsystem according to the present invention;

[0035] Figure 4A schematic diagram of the layout of the transmitting array element and the receiving array element according to the present invention;

[0036] Figure 5 for Figure 1 A partial enlarged schematic diagram of the multi-subband transceiver subsystem, central electronic equipment subsystem, data acquisition and recording subsystem, high-speed data exchange subsystem, multi-source sensor subsystem, and mechanical structure subsystem;

[0037] Figure 6 for Figure 1 A partial enlarged schematic diagram of the high-speed data exchange subsystem, industrial control and processing subsystem, communication control subsystem and monitoring center subsystem;

[0038] Figure 7 A schematic diagram of the motion range of the first linear antenna array according to the present invention;

[0039] Figure 8 is a schematic diagram of the motion range of the second linear antenna array according to the present invention;

[0040] Figure 9 A schematic diagram of the three-dimensional coordinate position of the observation target according to the present invention;

[0041] Figure 10 Schematic diagram comparing the special-shaped plane aperture of the present invention and the conventional plane aperture;

[0042] Figure 11 This is a flow chart of the control method of the three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to the present invention;

[0043] Figure 12 A schematic diagram of a process for obtaining radar detection data according to an embodiment of the present invention;

[0044] Figure 13 A schematic diagram of a process for obtaining radar detection data according to another embodiment of the present invention;

[0045] Figure 14 A schematic diagram of the process of obtaining video surveillance data according to the present invention;

[0046] Figure 15 Schematic diagram of the distribution of multiple cameras according to the present invention. Specific implementation method:

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] like Figure 1As shown, the three-dimensional special-shaped planar aperture holographic imaging security inspection radar described in the present invention includes a distributed antenna subsystem 1, a high-speed switch network subsystem 2, a multi-subband transceiver subsystem 3, a central electronic equipment subsystem 4, a data acquisition and recording subsystem 5, a high-speed data exchange subsystem 6, a multi-source sensor subsystem 7, a mechanical structure subsystem 8, a servo motion subsystem 9, an industrial control and processing subsystem 10, a communication control subsystem 11, a power supply protection subsystem 12 and a monitoring center subsystem 13. The present invention adopts a modular composition method. Through the control and communication settings, other detection modules or sensors can be flexibly added according to actual needs, thereby improving the modularity of the system, further improving the scalability of the entire system, and enhancing the system's availability and adaptability to the detection environment.

[0049] like Figure 2 As shown, the distributed antenna subsystem 1 includes at least two independent linear antenna arrays 101 and 102, namely the first linear antenna array 101 and the second linear antenna array 102, whose function is to convert the electrical excitation signal generated by the multi-subband transceiver subsystem 3 into an electromagnetic wave, and then transmit the electromagnetic wave as a transmission signal and receive the human body echo signal and transmit it to the multi-subband transceiver subsystem 3.

[0050] like Figure 3 As shown, the first linear antenna array 101 and the second linear antenna array 102 are symmetrically distributed on both sides of the security inspection channel 100. Each linear antenna array 101 and 102 includes three sparse sub-arrays with the same layout: the first linear antenna array 101 includes a first sparse sub-array A101, a second sparse sub-array A102, and a third sparse sub-array A103 connected in sequence; the second linear antenna array 102 includes a fourth sparse sub-array A201, a fifth sparse sub-array A202, and a sixth sparse sub-array A203 connected in sequence; the first sparse sub-array A101, the second sparse sub-array A102, the third sparse sub-array A103 and the fourth sparse sub-array A201, the fifth sparse sub-array A202, and the sixth sparse sub-array A203 are connected in sequence. They are symmetrically distributed on both sides of the security inspection channel 100; the length of the first sparse sub-matrix A101 and the fourth sparse sub-matrix A201 is equal and is L1, the length of the second sparse sub-matrix A102 and the fifth sparse sub-matrix A202 is equal and is L2, and the length of the third sparse sub-matrix A103 and the sixth sparse sub-matrix A203 is equal and is L3; the angle between two adjacent ones of the first sparse sub-matrix A101, the second sparse sub-matrix A102 and the third sparse sub-matrix A103 is θ, and the angle between two adjacent ones of the fourth sparse sub-matrix A201, the fifth sparse sub-matrix A202 and the sixth sparse sub-matrix A203 is θ, and the range of θ is 90° to 180°, and specific examples include 105°, 120°, 135°, 150°, etc.

[0051] like Figure 4As shown, each sparse sub-array includes a plurality of transmitting array elements 103 and a plurality of receiving array elements 104, and 4a, 4b, and 4c respectively show three layout modes of the transmitting array elements 103 and the receiving array elements 104 in each sparse sub-array;

[0052] The distance s between two adjacent transmitting array elements 103 or two adjacent receiving array elements 104 in each sparse sub-array is calculated according to formula (1):

[0053]

[0054] In formula (1), c is the propagation speed of electromagnetic waves (the propagation speed of electromagnetic waves in air is approximately equal to the propagation speed in vacuum, c = 3 × 10 8 m / s), L is the length of the sparse subarray (L=L1, L=L2, L=L3), fmax is the maximum operating frequency of the system (fmax≤1THz), and X is the monitoring range of the sparse subarray in the horizontal direction parallel to the security inspection channel 100.

[0055] In layout 4a, the number N of transmitting array elements 103 in each linear antenna array 101, 102 is T Equal to the number N of receiving array elements 104 R , multiple transmitting elements 103 are arranged in a line in the horizontal direction, and multiple receiving elements 104 are arranged in a line in the horizontal direction. The multiple transmitting elements 103 are located above the multiple receiving elements 104 in the vertical direction. The distance between two adjacent transmitting elements 103 or two adjacent receiving elements 104 is s, and the distance between any transmitting element 103 and an adjacent receiving element 104 in the horizontal direction is s / 2;

[0056] The number N of transmitting array elements 103 in each linear antenna array 101, 102 is T Calculated according to the formula:

[0057]

[0058] N in each linear antenna array 101, 102 T Transmitting array elements 103 and N R The receiving array elements 104 are arranged in the order of the first sparse sub-matrix A101, the second sparse sub-matrix A102, the third sparse sub-matrix A103 or the fourth sparse sub-matrix A201, the fifth sparse sub-matrix A202, and the sixth sparse sub-matrix A203; the specific sparse sub-matrix is ​​represented by kk, kk=1 represents the first sparse sub-matrix A101 or the fourth sparse sub-matrix A201, kk=2 represents the second sparse sub-matrix A102 or the fifth sparse sub-matrix A202, and kk=3 represents the third sparse sub-matrix A103 or the sixth sparse sub-matrix A203. nTIndicates the nth T (1<n T <N T ) transmitting units, i nR Indicates the nth R (1<n R <N R ) receiving units.

[0059] In layout 4b, each sparse sub-array includes a plurality of transmit array elements Nt and a plurality of receive array elements Nr, and the transmit array elements Nt and the receive array elements Nr are arranged in a line in the horizontal direction and are alternately distributed.

[0060] Each transmit array element group Nt includes at least one transmit array element 103 arranged in a line in the horizontal direction, for example, includes three transmit array elements 103 arranged in a line in the horizontal direction;

[0061] The specific number of the transmitting array elements 103 can be calculated according to the formula:

[0062]

[0063] Each receiving array element group Nr includes a plurality of receiving array elements 104 arranged in a line in the horizontal direction, for example, includes five receiving array elements 104 arranged in a line in the horizontal direction.

[0064] In layout 4c, each sparse subarray includes multiple transmit array element groups Nt and multiple receive array element groups Nr. The multiple transmit array element groups Nt are arranged in a horizontal line, and the multiple receive array element groups Nr are also arranged in a horizontal line. The multiple receive array element groups Nr are vertically located above the multiple transmit array element groups Nt. A receive array element group Nr is distributed between two adjacent transmit array element groups Nt. Each transmit array element group Nt includes three transmit array elements 103 arranged in a horizontal line, and each receive array element group Nr includes five receive array elements 104 arranged in a horizontal line. The distance between the closest transmit array element 103 and receive array element 104 in adjacent transmit array element groups Nt and receive array element groups Nr is s.

[0065] In the layout mode 4b or 4c, the first sparse sub-matrix A101 and the fourth sparse sub-matrix A201 have N TA1 transmit array elements, N RA1 The second sparse sub-matrix A102 and the fifth sparse sub-matrix A202 have N TA2 transmit array elements, N RA2 The third sparse sub-matrix A103 and the sixth sparse sub-matrix A203 have N TA3 transmit array elements, N RA3Specific sparse sub-matrix is ​​represented by kk, kk = 1 represents the first sparse sub-matrix A101 or the fourth sparse sub-matrix A201, kk = 2 represents the second sparse sub-matrix A102 or the fifth sparse sub-matrix A202, kk = 3 represents the third sparse sub-matrix A103 or the sixth sparse sub-matrix A203, the present invention is based on j TA Indicates the jth in the kkth sparse submatrix TA transmit array tuples, with j RA Indicates the jth in the kkth sparse submatrix RA Each transmitting array element has a total of N T0 There are N transmitting array elements in each receiving array element group. R0 receiving array elements, with j T Indicates the jth TA The jth of the transmit array tuples T transmitting array elements, with j R Indicates the jth RA The jth of the receiving array elements R receiving array elements.

[0066] exist Figure 4 In the layout 4a or 4c, the transmitting array elements 103 and the receiving array elements 104 are arranged in two rows in the vertical direction. h represents the distance between the farthest ends of adjacent transmitting array elements 103 and receiving array elements 104, which is calculated according to the formula:

[0067] h=2d e +d coup

[0068] Where, d e represents the height of the transmitting array element 103 or the receiving array element 104, d coup represents the distance between the nearest ends of adjacent transmitting array element 103 and receiving array element 104, d coup ∈[λ c , 6λ c ],λ c Indicates the wavelength of the electromagnetic wave corresponding to the intermediate operating frequency of the system, fmax is the maximum operating frequency of the system (fmax≤1THz), fmin is the minimum operating frequency of the system (fmin≥1GHz), and c is the electromagnetic wave propagation speed (c=3×10 8 m / s).

[0069] The spacing distance ΔH between each linear antenna array 101 and 102 when moving up and down during mechanical scanning is calculated according to the formula:

[0070]

[0071] Where c is the propagation speed of electromagnetic waves (c = 3 × 10 8 m / s), H is the height of the system monitoring area, and fmax is the maximum operating frequency of the system (fmax≤1THz).

[0072] exist Figure 1 and Figure 2 In the embodiment, the high-speed switch network subsystem 2 is communicatively connected with the distributed antenna subsystem 1, the multi-subband transceiver subsystem 3 and the central electronic equipment subsystem 4. It is capable of opening the transmitting channel and the receiving channel under the switch switching control logic sequence set by the central electronic equipment subsystem 4, and completing the selection of specific transmitting array elements and receiving array elements in each linear antenna array during signal transmission and signal reception.

[0073] like Figure 1 and Figure 3 As shown, the multi-sub-band transceiver subsystem 3 is communicatively connected with the high-speed switch network subsystem 2, the central electronic equipment subsystem 4 and the data acquisition and recording subsystem 5. The multi-sub-band transceiver subsystem 3 is used, on the one hand, to generate a multi-sub-band frequency-modulated continuous wave signal as an electrical excitation signal for the antenna unit in the distributed antenna subsystem 1 to transmit electromagnetic waves; on the other hand, it is used to receive the echo signal and perform multi-sub-band demodulation on it to generate an analog video signal that can be collected and recorded by the data acquisition and recording subsystem 5.

[0074] like Figure 1 and Figure 3 As shown, the central electronic equipment subsystem 4 is communicatively connected with the high-speed switch network subsystem 2, the multi-sub-band transceiver subsystem 3, the data acquisition and recording subsystem 5 and the high-speed data exchange subsystem 6. On the one hand, the central electronic equipment subsystem 4 is used to generate a timing trigger pulse that triggers the operation of the multi-sub-band transceiver subsystem 3 and the data acquisition and recording subsystem 5; on the other hand, it is used to control the high-speed switch network subsystem 2 to complete the switch switching under its set control logic; it can also receive control instructions from the high-speed data exchange subsystem 6; in addition, it is also used to pre-process the radar echo data recorded and cached by the data acquisition and recording subsystem 5, and the pre-processed radar echo data is then returned to the cache in the data acquisition and recording subsystem 5.

[0075] like Figure 1 and Figure 3As shown, the data acquisition and recording subsystem 5 is communicatively connected with the multi-sub-band transceiver subsystem 3, the central electronic equipment subsystem 4 and the high-speed data exchange subsystem 6. The data acquisition and recording subsystem 5 is used to perform analog-to-digital conversion, sampling and recording on the multi-sub-band demodulated analog video signal output by the multi-sub-band transceiver subsystem 3 to form radar echo data and cache it in a buffer therein; the radar echo data can also be transmitted to the central electronic equipment subsystem 4 for preprocessing, and the preprocessed radar echo data is then returned to the buffer in the data acquisition and recording subsystem 5, and the preprocessed radar echo data can also be transmitted to the high-speed data exchange subsystem 6; data retransmission instructions can also be transmitted between the data acquisition and recording subsystem 5 and the high-speed data exchange subsystem 6.

[0076] like Figure 1 、 Figure 5 and Figure 6 As shown, the high-speed data exchange subsystem 6 is communicatively connected with the data acquisition and recording subsystem 5, the multi-source sensor subsystem 7 and the industrial control and processing subsystem 10. The high-speed data exchange subsystem 6 is used to create a high-speed route to realize the transmission of the pre-processed radar echo data in one or more of the data acquisition and recording subsystems 5 and the temperature measurement data, metal detection data, and human target three-dimensional point cloud data generated by the multi-source sensor subsystem 7 to the industrial control and processing subsystem 10.

[0077] like Figure 1 and Figure 5 As shown, the multi-source sensor subsystem 7 is communicatively connected to the high-speed data exchange subsystem 6. The multi-source sensor subsystem 7 includes a temperature measurement subsystem 701, a metal detection subsystem 702, and a three-dimensional point cloud measurement subsystem 703, etc., which are used to provide temperature measurement data, metal detection data, three-dimensional point cloud data of human targets, etc.

[0078] exist Figure 1 In the embodiment, the mechanical structure subsystem 8 is used to provide mechanical structure support for other subsystems, especially to provide direct mechanical structure support for the central electronic equipment subsystem 4, the multi-source sensor subsystem 7 and the servo motion subsystem 9.

[0079] like Figure 1 and Figure 2As shown, the servo motion subsystem 9 is connected to the distributed antenna subsystem 1 and is used to carry and drive the structural parts of the distributed antenna subsystem 1 to move in a specific motion mode when the distributed antenna subsystem 1 transmits and receives signals, so that the distributed antenna subsystem 1 moves in a vertical direction, thereby forming a three-dimensional special-shaped planar aperture in space; the servo motion subsystem 9 specifically includes a servo controller 901, a motor 902 and a transmission device 903.

[0080] like Figure 7 and Figure 8 As shown, the servo motion subsystem 9 drives the distributed antenna subsystem 1 to move in the vertical direction, and the maximum distance that the first linear antenna array 101 and the second linear antenna array 102 move in the vertical direction is L H ; The first sparse sub-array A101 forms a planar aperture P A1 P B1 P C1 P D1 , whose size is L H ×L1; the second sparse sub-array A102 forms a planar aperture P C1 P D1 P E1 P F1 , whose size is L H ×L2; the third sparse sub-array A102 forms a planar aperture P E1 P F1 P G1 P H1 , whose size is L H ×L3; the fourth sparse sub-array A201 forms a planar aperture P A2 P B2 P C2 P D2 , whose size is L H ×L1; the fifth sparse sub-array A202 forms a planar aperture P C2 P D2 P E2 P F2 , whose size is L H ×L2; the sixth sparse sub-array A203 forms a planar aperture P E2 P F2 P G2 P H2 , whose size is L H ×L3; usually, L H Take 0.2~3m, L1 take 0.1~1m, L2 take 0.1~1.2m, L3 take 0.1~1m; the plane aperture P A1 P B1 P C1 P D1 、PC1 P D1 P E1 P F1 、P E1 P F1 P G1 P H1 、P A2 P B2 P C2 P D2 、P C2 P D2 P E2 P F2 、P E2 P F2 P G2 P H2 The irregular plane aperture that constitutes the polygon, L H That is the height of the special-shaped planar aperture, which is distributed in the horizontal and vertical directions at the same time, so as to achieve height resolution and array resolution. By emitting a signal with a certain bandwidth, it can also achieve distance resolution, thereby realizing three-dimensional resolution imaging of the observed target.

[0081] like Figure 9 As shown, point P n (x n ,y n , z n ) is located at the observation target P n The three-dimensional coordinate position (x n ,y n , z n ), O is the origin of coordinates, XOY is the horizontal plane (Z=z n ) rectangular coordinate system, wherein the X-axis is the array direction (horizontally parallel to the security inspection channel 100), the Y-axis is the distance direction (horizontally perpendicular to the security inspection channel 100), and the Z-axis is the height direction (vertical direction);

[0082] Among them, the height (vertical direction) resolution ρ z :

[0083]

[0084] Where θ z R is the height (vertical) dimension of the special-shaped plane aperture, min is the shortest distance from the observation target to the linear antenna arrays 101 and 102;

[0085] Array direction (in the horizontal direction parallel to the security inspection channel 100) resolution ρ a :

[0086]

[0087] Where, c is the propagation speed of electromagnetic waves (the propagation speed of electromagnetic waves in air is approximately equal to the propagation speed in vacuum, c = 3×10 8 m / s),

[0088] R min is the shortest distance from the observation target to the linear antenna arrays 101 and 102, L a is the effective size of the special-shaped planar aperture, which is determined by the length of each sparse subarray and the angle θ between two adjacent sparse subarrays. n is the three-dimensional coordinate position of the observed target (x n ,y n , z n ) in the array direction (in the horizontal direction parallel to the security inspection channel 100);

[0089] Distance resolution (in the horizontal direction perpendicular to the security inspection channel 100) ρ r :

[0090]

[0091] Where c is the propagation speed of electromagnetic waves (the propagation speed of electromagnetic waves in air is approximately equal to the propagation speed c in vacuum, c = 3×10 8 m / s), fmax is the maximum operating frequency of the system (fmax≤1THz), and fmin is the minimum operating frequency of the system (fmin≥1GHz).

[0092] like Figure 10 As shown, since the geometry of the human body surface is relatively simple, after the electromagnetic wave signal is radiated to the human body surface and its appendages, it will be difficult to be received after reflection due to the relative smoothness of the human body surface when the incident angle is large; 9a shows the use of a conventional plane aperture (for example, plane aperture P C1 P D1 P E1 P F1 、P C2 P D2 P E2 P F2), when the human body faces the planar aperture, the electromagnetic wave signal radiated from the side will be reflected to the area outside the receiving antenna, and often only the front or back image of the human body can be seen, and it is difficult to observe the side of the human body. If the human body turns to the side to face the planar aperture, it is necessary to increase the data collection time, which affects the data acquisition efficiency; 9b shows a schematic diagram of the electromagnetic wave signal reception and transmission of the special-shaped planar aperture described in the present invention. The special-shaped planar aperture can observe the front, side and back of the human body at the same time. Based on multiple planar apertures, there is no need for multiple data acquisitions, and in the imaging process, multi-angle observation information can also be used to greatly enhance the advantages of the special-shaped planar aperture observation.

[0093] like Figure 1 and Figure 6 As shown, the industrial control and processing subsystem 10 is communicatively connected with the high-speed data exchange subsystem 6, the communication control subsystem 11 and the monitoring center subsystem 13. The industrial control and processing subsystem 10 is used to complete radar echo data access, imaging processing, image processing, target detection, classification and recognition processing, as well as work mode setting, system operation, pause, calibration, debugging and other control functions. It includes a full-system control subsystem 1001, a portable control subsystem 1002, a one-key operation subsystem 1003, and an automatic sensing subsystem 1004; wherein, the full-system control subsystem 1001 is used for data processing; the portable control subsystem 1002 can be a mobile terminal, such as a mobile phone, IPad, etc.; the one-key operation subsystem 1003 can be installed on a device, similar to a one-key start button, and can also be installed on the monitoring center subsystem 13; the automatic sensing subsystem 1004 is a sensor that can detect people entering the system. When a person enters, the automatic sensing subsystem 1004 will trigger the multi-source sensor subsystem 7 to start.

[0094] like Figure 1 and Figure 6 As shown, the communication control subsystem 11 is communicatively connected to the industrial control and processing subsystem 10 to complete the distribution of image data, classification result data and other data among the servers, workstations and portable terminals of each subsystem in the industrial control and processing subsystem 10.

[0095] like Figure 1 As shown, the power supply protection subsystem 12 is used to provide power supply to each subsystem and provide power supply protection such as overcurrent, overload, current quick trip, and low voltage.

[0096] like Figure 1 and Figure 6 As shown, the monitoring center subsystem 13 is in communication connection with the industrial control and processing subsystem 10 , and the monitoring center subsystem 13 is used to provide a comprehensive display of multi-system status and results.

[0097] like Figure 11 As shown, the present application also provides a control method for a three-dimensional special-shaped planar aperture holographic imaging security inspection radar, comprising the following steps:

[0098] Step S1: system initialization;

[0099] The power supply protection subsystem 12 provides power to each subsystem, detects whether each subsystem has an abnormal state, and starts the system to enter the working state;

[0100] Preferably, the present invention further comprises step S0 before step S1: setting basic parameters of the three-dimensional special-shaped planar aperture holographic imaging security inspection radar;

[0101] The step S0 specifically includes the following steps:

[0102] Step S01: setting a distance s between two adjacent transmitting array elements 103 or two adjacent receiving array elements 104 in each sparse sub-array;

[0103] Step S02: setting a spacing distance ΔH between each linear antenna array 101 and 102 when moving up and down during mechanical scanning;

[0104] Step S03: Setting the frequency matrix f of the linear antenna array 101 101 and the frequency matrix f of the linear antenna array 102 102 ;

[0105] Step S04: setting the layout of multiple cameras;

[0106] The step S1 specifically includes the following steps:

[0107] Step S11: The system is powered on. The power supply protection subsystem 12 supplies power to the central electronic equipment subsystem 4, the data acquisition and recording subsystem 5, the high-speed data exchange subsystem 6, the multi-source sensor subsystem 7, the servo motion subsystem 9, the industrial control and processing subsystem 10, the communication control subsystem 11, and the monitoring center subsystem 13. If the indicator lights of each subsystem (the distributed antenna subsystem 1, the high-speed switch network subsystem 2, the multi-sub-band transceiver subsystem 3, the central electronic equipment subsystem 4, the data acquisition and recording subsystem 5, the high-speed data exchange subsystem 6, the multi-source sensor subsystem 7, the servo motion subsystem 9, the industrial control and processing subsystem 10, the communication control subsystem 11, the power supply protection subsystem 12, and the monitoring center subsystem 13) are on, it indicates normal; otherwise, maintenance is required.

[0108] Step S12: Start the system, start the central electronic equipment subsystem 4, data acquisition and recording subsystem 5, high-speed data exchange subsystem 6, multi-source sensor subsystem 7, servo motion subsystem 9, industrial control and processing subsystem 10, communication control subsystem 11, and monitoring center subsystem 13 and put them into working state;

[0109] Step S2: Control system operation;

[0110] The industrial control and processing subsystem 10 controls the operation of the system through the portable control subsystem 1002, the one-button operation subsystem 1003 or the automatic sensing subsystem 1004; the automatic sensing subsystem 1004 is a sensor that can detect when a person enters the system. When a person enters, the automatic sensing subsystem 1004 triggers the multi-source sensor subsystem 7 to start.

[0111] Step S3: Acquire radar detection data, body temperature detection data, metal detection data, and video surveillance data;

[0112] (1) Obtaining radar detection data: detecting hidden objects by transmitting and receiving electromagnetic waves through the system;

[0113] Step S31: radar detection initialization; the industrial control and processing subsystem 10 starts the central electronic equipment subsystem 4 to perform radar detection initialization; specifically including:

[0114] Step S311: starting the central electronic equipment subsystem 4; the industrial control and processing subsystem 10 starts the central electronic equipment subsystem 4;

[0115] Step S312: Start the subsystems; the central electronic equipment subsystem 4 starts the distributed antenna subsystem 1, the high-speed switch network subsystem 2, the multi-subband transceiver subsystem 3 and the servo motion subsystem 9;

[0116] Step S313: Initializing the distributed antenna subsystem 1;

[0117] Detecting whether one of the linear antenna arrays is at the highest point and the other linear antenna array is at the lowest point, for example, whether the linear antenna array 101 is at the highest point and the linear antenna array 102 is at the lowest point, or whether the linear antenna array 101 is at the lowest point and the linear antenna array 102 is at the highest point;

[0118] If one of the linear antenna arrays is not at the highest point or the other linear antenna array is not at the lowest point, the central electronic equipment subsystem 4 controls the servo motion subsystem 9, and its servo controller 901 controls the motor 902 to drive the transmission device 903, so that the distributed antenna subsystem 1 is initialized;

[0119] Step S314: Initializing radar measurement parameters;

[0120] Initialize the linear antenna array;

[0121] Step S32: transmitting and receiving signals; specifically comprising the following steps:

[0122] Step S321: Initialize the transmitting array element;

[0123] Initialize the transmitting array element;

[0124] Step S322: Open the transmission channel;

[0125] Turning on the transmitting elements in the linear antenna array 101 and the linear antenna array 102;

[0126] Step S323: opening the receiving channel;

[0127] Turning on the receiving elements in the linear antenna array 101 and the linear antenna array 102;

[0128] Step S324: transmitting a signal;

[0129] The central electronic equipment subsystem 4 controls the multi-sub-band transceiver subsystem 3 to generate a multi-sub-band frequency-modulated continuous wave signal (frequency matrix) as an electrical excitation signal for the transmitting array elements in the distributed antenna subsystem 1 to transmit electromagnetic waves;

[0130] Step S325: receiving a signal;

[0131] The distributed antenna subsystem 1 receives signals through the receiving array elements (obtains signals transmitted by the transmitting array elements), and then uses a matched filter to enable the linear antenna array 101 to receive only signals transmitted by the transmitting array elements of the linear antenna array 101, and the linear antenna array 102 to receive only signals transmitted by the transmitting array elements of the linear antenna array 102, and the distributed antenna subsystem 1 receives echo signals;

[0132] Step S326: radar echo data processing;

[0133] The echo signal generated by the distributed antenna subsystem 1 is transmitted to the multi-sub-band transceiver subsystem 3 via the high-speed switch network subsystem 2. The multi-sub-band transceiver subsystem 3 demodulates the echo signal to obtain an analog video signal, and transmits the analog video signal to the data acquisition and recording subsystem 5. The analog video signal is buffered in the data acquisition and recording subsystem 5. The data acquisition and recording subsystem 5 performs analog-to-digital conversion, samples, and records the analog video signal to form radar echo data. The data acquisition and recording subsystem 5 transmits the buffered radar echo data to the central electronic equipment subsystem 4 for preprocessing. Finally, the central electronic equipment subsystem 4 transmits the preprocessed radar echo data to the data acquisition and recording subsystem 5 for storage.

[0134] Step S33: receiving array element cycle;

[0135] Determine whether the receiving array element has completed the cycle, if so, execute step S34, if not, return to step S323;

[0136] Step S34: transmitting array element cycle;

[0137] Determine whether the transmitting array element has completed the cycle, if so, execute step S35, if not, return to step S321 or S322;

[0138] Step S35: sparse sub-array loop;

[0139] Determine whether the sparse sub-matrix kk is greater than or equal to 3, if so, execute step S36, if not, return to step S321;

[0140] Step S36: linear antenna array loop;

[0141] Determine whether the linear antenna array 101 is at the lowest point or whether the linear antenna array 102 is at the highest point. If so, it indicates that radar detection data collection is completed. If not, return to step S321, indicating that radar detection data is being collected.

[0142] According to the imaging mechanism of the system (array element layout and transmission and reception method), it can be divided into the following two situations:

[0143] like Figure 12 As shown, the linear antenna arrays 101 and 102 adopt Figure 4 In the 4a layout mode, steps S314 to S36 are specifically as follows:

[0144] Step S314: Initializing radar measurement parameters;

[0145] Initialize the linear antenna array, that is, let kk = 1, i nT =1;

[0146] Step S32: transmitting and receiving signals; specifically comprising the following steps:

[0147] Step S321: Initialize the transmitting array element;

[0148] Initialize the transmitting array element, that is, let i nR =i nT ;

[0149] Step S322: Open the transmission channel;

[0150] According to the obtained kk, i nT Parameter, open the kkth sparse subarray i in the linear antenna array 101 and the linear antenna array 102 nT transmitting array elements;

[0151] Step S323: opening the receiving channel;

[0152] According to the obtained kk, i nR Parameter, open the kkth sparse subarray i in the linear antenna array 101 and the linear antenna array 102 nR receiving array elements;

[0153] Step S324: transmitting a signal; the central electronic equipment subsystem 4 controls the multi-sub-band transceiver subsystem 3 to generate a multi-sub-band frequency-modulated continuous wave signal (frequency matrix) as an electrical excitation signal for the transmitting array elements in the distributed antenna subsystem 1 to transmit electromagnetic waves; specifically, the following steps are included:

[0154] Step 3241: Generate a frequency matrix of the linear antenna array 101;

[0155] The central electronic equipment subsystem 4 controls the multi-subband transceiver subsystem 3 to generate the frequency matrix f of the linear antenna array 101. 101 , and the frequency matrix f 101 Transmitted to the distributed antenna subsystem 1 through the high-speed switch network subsystem 2;

[0156] Step 3242: Generate a frequency matrix of the linear antenna array 102;

[0157] The central electronic equipment subsystem 4 controls the multi-subband transceiver subsystem 3 to generate the frequency matrix f of the linear antenna array 102. 102 , and the frequency matrix f 102 Transmitted to the distributed antenna subsystem 1 through the high-speed switch network subsystem 2;

[0158] Wherein, the frequency matrix f of the linear antenna array 101 is 101and the frequency matrix f of the linear antenna array 102 102 Follow these steps to set up:

[0159] Step S32401: dividing the frequency points;

[0160] Specifically include:

[0161] Step S324011: Set the frequency point number Q, where Q is a positive integer;

[0162] Step S324012: According to the maximum operating frequency fmax (≤1THz) and the minimum operating frequency fmix (≥1GHz) of the system, obtain the frequency matrix f of the system, which is recorded as:

[0163] f=fmin+iΔf

[0164] Where, represents the frequency interval, i = 1, 2, ..., Q, f i represents the i-th element in the frequency matrix f;

[0165] Step S32402: dividing frequency bands;

[0166] According to the frequency matrix f of the system, two sub-band frequencies f1 and f2 are obtained. f1 and f2 are expressed as:

[0167]

[0168] Where, f mid Represents the mid-th element in the frequency matrix f (f1 and f2 are interchangeable). At this time, there are the following two cases:

[0169] (1) If Q is an even number, then mid = Q / 2;

[0170] (2) If Q is an odd number, then mid = (Q-1) / 2 or mid = (Q+1) / 2

[0171] Step S32403: setting the frequency matrix;

[0172] Specifically include:

[0173] Step S324031: Setting the frequency matrix f of the linear antenna array 101 101 ;

[0174] According to the two sub-band frequencies f1 and f2, the frequency matrix f of the linear antenna array 101 is obtained. 101

[0175] f 101 =[ <f2> ， <f1>]

[0176] In the formula, <> means reversing the order of matrix elements, that is, <f2>=f2(end:-1:1), end represents the last element in the matrix, <f1>=f1(end:-1:1), "-1" means decreasing in sequence;

[0177] Step S324032: Setting the frequency matrix f of the linear antenna array 102 102 ;

[0178] According to the two sub-band frequencies f1 and f2, the frequency matrix f of the linear antenna array 102 is obtained. 102

[0179] f 102 =[f1,f2]

[0180] Since the layout of the linear antenna array 101 is the same as that of the linear antenna array 102, the frequency matrix f 101 With the frequency matrix f 102 The sub-band frequencies can be interchanged;

[0181] Step 3243: transmitting a signal;

[0182] The distributed antenna subsystem 1 transmits electromagnetic waves through the transmission channel opened by the high-speed switch network subsystem 2 according to the acquired frequency matrix;

[0183] Step S325: receiving a signal;

[0184] The linear antenna array 101 only receives signals transmitted by the transmitting elements of the linear antenna array 101, the linear antenna array 102 only receives signals transmitted by the transmitting elements of the linear antenna array 102, and the distributed antenna subsystem 1 receives echo signals;

[0185] Step S326: radar echo data processing; specifically including the following steps:

[0186] Step S3261: demodulating the echo signal;

[0187] The echo signal generated by the distributed antenna subsystem 1 is transmitted to the multi-sub-band transceiver subsystem 3 via the high-speed switch network subsystem 2. The multi-sub-band transceiver subsystem 3 demodulates the echo signal to obtain an analog video signal, and transmits the analog video signal to the data acquisition and recording subsystem 5. The analog video signal is buffered in the data acquisition and recording subsystem 5. The data acquisition and recording subsystem 5 performs analog-to-digital conversion, samples, and records the analog video signal to form radar echo data. The radar echo data is buffered in the data acquisition and recording subsystem 5.

[0188] Step S3262: pre-processing the radar echo data;

[0189] The data acquisition and recording subsystem 5 transmits the cached radar echo data to the central electronic equipment subsystem 4 for preprocessing, and finally the central electronic equipment subsystem 4 transmits the preprocessed radar echo data to the data acquisition and recording subsystem 5 and stores it;

[0190] The pre-processing method is to rearrange the obtained radar echo data in order of frequency from small to large;

[0191] Step S33: receiving array element cycle;

[0192] Judgment i nT Is it greater than or equal to i nT +1;

[0193] If not, let i nT =i nT +1, and return to step S323;

[0194] If yes, proceed to step S34;

[0195] Step S34: transmitting array element cycle;

[0196] Judgment i nT Is it greater than or equal to N T ;

[0197] If not, let i nT =i nT +1, and return to step S321;

[0198] If yes, proceed to step S35;

[0199] Step S35: sparse sub-array loop;

[0200] Determine whether the sparse submatrix kk is greater than or equal to N SubArray , N SubArray The range is 1 to 10, usually N SubArray =3;

[0201] If yes, proceed to step S36;

[0202] If not, let kk=kk+1, i nT =1, and return to step S321;

[0203] Step S36: linear antenna array loop;

[0204] Determining whether the linear antenna array 101 is at the lowest point or whether the linear antenna array 102 is at the highest point;

[0205] If yes, it means that the radar detection data collection is completed, and step S4 is executed;

[0206] If not, the linear antenna array 101 is moved down by ΔH, and the linear antenna array 102 is moved up by ΔH, kk=1, i nT =1, and returns to step S321, indicating that radar detection data is being collected;

[0207] The scattering data S obtained by the linear antenna arrays 101 and 102 echo (f) can be expressed as:

[0208]

[0209] Where V represents the integration range of the monitoring area, f represents the frequency, and t represents the propagation time of the electromagnetic wave signal (echo signal);

[0210] like Figure 13 As shown, the linear antenna arrays 101 and 102 adopt Figure 4 In the layout mode 4b or 4c, steps S314 to S36 are as follows:

[0211] Step S314: Initializing radar measurement parameters;

[0212] Initialize the linear antenna array, that is, let kk = 1, j T =1,j R =1,j TA =1;

[0213] Step S32: transmitting and receiving signals; specifically comprising the following steps:

[0214] Step S321: Initialize the transmitting array element;

[0215] Initialize the transmitting array element, that is, let j RA =j TA ;

[0216] Step S322: Open the transmission channel;

[0217] According to the obtained kk, j TA 、j T Parameter, open the kkth sparse subarray jth in the linear antenna array 101 and the linear antenna array 102 TA The jth of the transmit array tuples T transmitting array elements;

[0218] Step S323: opening the receiving channel;

[0219] According to the obtained kk, j RA 、j R Parameter, open the kkth sparse subarray jth in the linear antenna array 101 and the linear antenna array 102 RA The jth of the transmit array tuples R receiving array elements;

[0220] Step S324: transmitting a signal; the central electronic equipment subsystem 4 controls the multi-sub-band transceiver subsystem 3 to generate a multi-sub-band frequency-modulated continuous wave signal (frequency matrix) as an electrical excitation signal for the transmitting array elements in the distributed antenna subsystem 1 to transmit electromagnetic waves; specifically, the following steps are included:

[0221] Step 3241: Generate a frequency matrix of the linear antenna array 101;

[0222] The central electronic equipment subsystem 4 controls the multi-subband transceiver subsystem 3 to generate the frequency matrix f of the linear antenna array 101. 101 , and the frequency matrix f 101 Transmitted to the distributed antenna subsystem 1 through the high-speed switch network subsystem 2;

[0223] Step 3242: Generate a frequency matrix of the linear antenna array 102;

[0224] The central electronic equipment subsystem 4 controls the multi-subband transceiver subsystem 3 to generate the frequency matrix f of the linear antenna array 102. 102 , and the frequency matrix f 102 Transmitted to the distributed antenna subsystem 1 through the high-speed switch network subsystem 2;

[0225] Wherein, the frequency matrix f of the linear antenna array 101 is 101 and the frequency matrix f of the linear antenna array 102 102 Follow these steps to set up:

[0226] Step S32401: dividing the frequency points;

[0227] Specifically include:

[0228] Step S324011: Set the frequency point number Q, where Q is a positive integer;

[0229] Step S324012: According to the maximum operating frequency fmax (≤1THz) and the minimum operating frequency fmix (≥1GHz) of the system, obtain the frequency matrix f of the system, which is recorded as:

[0230] f=fmin+iΔf

[0231] Where, Indicates the frequency interval, i = 1, 2, L, Q, f i represents the i-th element in the frequency matrix f;

[0232] Step S32402: dividing frequency bands;

[0233] According to the frequency matrix f of the system, two sub-band frequencies f1 and f2 are obtained. f1 and f2 are expressed as:

[0234]

[0235] Where, f mid Represents the mid-th element in the frequency matrix f (f1 and f2 are interchangeable). At this time, there are the following two cases:

[0236] (1) If Q is an even number, then mid = Q / 2;

[0237] (2) If Q is an odd number, then mid = (Q-1) / 2 or mid = (Q+1) / 2

[0238] Step S32403: setting the frequency matrix;

[0239] Specifically include:

[0240] Step S324031: Setting the frequency matrix f of the linear antenna array 101 101 ;

[0241] According to the two sub-band frequencies f1 and f2, the frequency matrix f of the linear antenna array 101 is obtained. 101

[0242] f 101 =[ <f2> ， <f1>]

[0243] In the formula, <> means reversing the order of matrix elements, that is, <f2>=f2(end:-1:1), end represents the last element in the matrix, <f1>=f1(end:-1:1), "-1" means decreasing in sequence;

[0244] Step S324032: Setting the frequency matrix f of the linear antenna array 102 102 ;

[0245] According to the two sub-band frequencies f1 and f2, the frequency matrix f of the linear antenna array 102 is obtained. 102

[0246] f 102 =[f1,f2]

[0247] Since the layout of the linear antenna array 101 is the same as that of the linear antenna array 102, the frequency matrix f 101 With the frequency matrix f 102 The sub-band frequencies can be interchanged;

[0248] Step 3243: transmitting a signal;

[0249] The distributed antenna subsystem 1 transmits electromagnetic waves through the transmission channel opened by the high-speed switch network subsystem 2 according to the acquired frequency matrix;

[0250] The signal transmitted from the linear antenna array 101 is expressed as:

[0251]

[0252] The signal transmitted from the linear antenna array 102 is expressed as:

[0253]

[0254] Step S325: receiving a signal;

[0255] The linear antenna array 101 only receives signals transmitted by the transmitting elements of the linear antenna array 101, the linear antenna array 102 only receives signals transmitted by the transmitting elements of the linear antenna array 102, and the distributed antenna subsystem 1 receives echo signals;

[0256] The echo signal received by the linear antenna array 101 is expressed as:

[0257]

[0258] The echo signal received by the linear antenna array 102 is expressed as:

[0259]

[0260] Where, σ represents the complex scattering coefficient of the target;

[0261] Step S326: radar echo data processing; specifically including the following steps:

[0262] Step S3261: demodulating the echo signal;

[0263] The echo signal generated by the distributed antenna subsystem 1 is transmitted by the high-speed switch network subsystem 2

[0264] S1(kk,j T ,j R , f 101 ), S2(kk,j T ,j R , f 102 ) is transmitted to the multi-sub-band transceiver subsystem 3, and the multi-sub-band transceiver subsystem 3 transmits the echo signal S1 (kk, j T ,j R , f 101 ), S2(kk,j T ,j R , f 102 ) is demodulated to obtain the analog video signal S 10 (kk,j T ,j R , f 101 ), S 20 (kk,j T ,j R , f 102 ), and the analog video signal

[0265] S 10 (kk,j T ,j R , f 101 ), S 20 (kk,j T ,j R , f 102 ) is transmitted to the data acquisition and recording subsystem 5, and the data acquisition and recording subsystem 5 processes the analog video signal S 10 (kk,j T ,j R , f 101 ), S 20 (kk,j T ,j R , f 102 ) performing analog-to-digital conversion sampling and recording to form radar echo data, the radar echo data being cached in the data acquisition and recording subsystem 5;

[0266] Step S3262: pre-processing the radar echo data;

[0267] The data acquisition and recording subsystem 5 transmits the cached radar echo data to the central electronic equipment subsystem 4 for preprocessing, and finally the central electronic equipment subsystem 4 transmits the preprocessed radar echo data to the data acquisition and recording subsystem 5 and stores it;

[0268] The pre-processing method is to rearrange the obtained radar echo data in order of frequency from small to large;

[0269] The radar echo data processing of the linear antenna array 101 is expressed as:

[0270]

[0271] The radar echo data processing of the linear antenna array 102 is expressed as:

[0272]

[0273] Where T represents transpose;

[0274] Step S33: receiving array element cycle;

[0275] Judgment R Is it greater than or equal to N R0 ;

[0276] If not, let j R =j R +1, and return to step S323;

[0277] If so, further judge j RA Is it greater than or equal to N TA -1, N TA =N TA1 、N TA2 or N TA3 ;

[0278] If not, let j RA =j RA +1,j R =1, and return to step S323;

[0279] If yes, proceed to step S34;

[0280] Step S34: transmitting array element cycle;

[0281] Judgment T Is it greater than or equal to N T0 ;

[0282] If not, let j T =j T +1,j R =1, and return to step S322;

[0283] If so, further judge j TA Is it greater than or equal to N TA , N TA =N TA1 、N TA2 or N TA3 ;

[0284] If not, let j TA =j TA +1,j T =1,j R =1, and return to step S321;

[0285] If yes, proceed to step S35;

[0286] Step S35: sparse sub-array loop;

[0287] Determine whether the sparse submatrix kk is greater than or equal to N SubArray , N SubArray The range is 1 to 10, usually N SubArray =3;

[0288] If yes, proceed to step S36;

[0289] If not, let kk=kk+1, j TA =1,j T =1,j R =1, and return to step S321;

[0290] Step S36: linear antenna array loop;

[0291] Determining whether the linear antenna array 101 is at the lowest point or whether the linear antenna array 102 is at the highest point;

[0292] If yes, it means that the radar detection data collection is completed, and step S4 is executed;

[0293] If not, the linear antenna array 101 is moved down by ΔH, and the linear antenna array 102 is moved up by ΔH, kk=1, j TA =1,j T =1,j R =1, and returns to step S321, indicating that radar detection data is being collected;

[0294] The scattering data S obtained by the linear antenna arrays 101 and 102 echo (f) can be expressed as:

[0295]

[0296] Where V represents the integration range of the monitoring area, f represents the frequency, and t represents the propagation time of the electromagnetic wave signal (echo signal);

[0297] (2) Obtaining body temperature detection data: Measure the body temperature of the human body through the temperature measurement subsystem 701, and obtain the body temperature value i c ; Specifically including the following steps:

[0298] Step S3201: Start the temperature measurement subsystem 701; the portable control subsystem 1002, the one-key operation subsystem 1003 or the automatic sensing subsystem 1004 in the industrial control and processing subsystem 10 starts the temperature measurement subsystem 701; the temperature measurement subsystem 701 can use a human infrared sensor;

[0299] Step S3202: Initialize body temperature detection, let i c =0;

[0300] Step S3203: Body temperature measurement: Use the temperature measurement subsystem 701 to measure the body temperature of the human body and obtain the body temperature value i c ;

[0301] (3) Obtaining metal detection data: Detecting whether there is hidden metal through the metal detection subsystem 702; specifically, the following steps are included:

[0302] Step S3301: activating the metal detection subsystem 702; the portable control subsystem 1002, the one-button operation subsystem 1003 or the automatic sensing subsystem 1004 in the industrial control and processing subsystem 10 activates the metal detection subsystem 702;

[0303] Step S3302: Initialize the metal detection and set the metal detection measurement value i m Equal to 0, set the threshold i m0 ;

[0304] Step S3303: Metal detection; using the metal detection subsystem 702 to detect whether there is hidden metal, obtain the metal detection measurement value i m , if i m Greater than or equal to threshold i m0 , it means there is hidden metal; if i m Less than threshold i m0 , then it means there is no hidden metal;

[0305] (IV) Obtaining video surveillance data: Obtaining video surveillance data Data through the three-dimensional point cloud measurement subsystem 703 all , and extract the face data Data face ;like Figure 14 As shown, the present invention also provides a three-dimensional special-shaped plane aperture holographic imaging security inspection radar optical reconstruction method, which specifically includes the following steps:

[0306] Step S3401: Initialize 3D measurement;

[0307] The portable control subsystem 1002, the one-key operation subsystem 1003 or the automatic sensing subsystem 1004 in the industrial control and processing subsystem 10 starts the 3D point cloud measurement subsystem 703 and initializes the parameters of the 3D point cloud measurement subsystem 703;

[0308] The three-dimensional point cloud measurement subsystem 703 includes a plurality of cameras 105, which are arranged in a line in the linear antenna arrays 101 and 102. The three-dimensional point cloud measurement subsystem 703 uses the plurality of cameras 105 to obtain images of the human body at different angles. The layout of the plurality of cameras 105 is as follows: Figure 15 As shown;

[0309] The distance between two adjacent cameras 105 is d u , d u It can be expressed as:

[0310]

[0311] Where, f fcous represents the focal length of the lens, ρ u Indicates the horizontal photo repetition, L u Indicates the horizontal length of the camera's photosensitive element;

[0312] d u It can also be expressed as:

[0313]

[0314] Where θ u Indicates the horizontal observation angle of the camera (horizontal field of view angle);

[0315] When L=L2, d u represents the distance between two adjacent cameras 105 on the second sparse sub-array A102 or the fifth sparse sub-array A202; when L=L1 or L3, d u represents the distance between two adjacent cameras 105 on the first sparse sub-matrix A101, the third sparse sub-matrix A103, the fourth sparse sub-matrix A201 or the sixth sparse sub-matrix A203.

[0316] Among them, L x represents the distance between the second sparse sub-array A102 or the fifth sparse sub-array A202 and the security inspection channel 100, and L x is the system parameter, L′ x represents the distance between the center of the first sparse sub-matrix A101, the third sparse sub-matrix A103, the fourth sparse sub-matrix A201 or the sixth sparse sub-matrix A203 and the security inspection channel 100, L′ x Calculated according to the formula:

[0317] L′ x =L x -L sin(θ)

[0318] Where, L = L1 or L3; when L = L2, θ = π, then L' x =L x ;

[0319] The plurality of cameras 105 arranged are marked in the order of linear antenna array 101, linear antenna array 102, L1, L2, and L3, for a total of N. c Camera 105;

[0320] Marking the cameras 105 means numbering all the cameras 105. The numbering rule is to number them in the order of the first linear antenna array 101, the second linear antenna array 102, L1, L2 and L3, that is, the order of A101, A102, A103, A201, A202, A203. The cameras 105 can also be numbered in the order of A101, A102, A103, A203, A202, A201.

[0321] Initialization parameter i 3D =1,i 3D Indicates the i 3D Collect human optical photos, i 3D <n 3D ;n 3D It can be expressed as:

[0322]

[0323] Where, floor() represents rounding down, H is the height of the system monitoring area, ΔH is the distance between the linear antenna arrays 101 and 102 when they move up and down during mechanical scanning, (d v )min means d v The minimum value of d v It can be expressed as:

[0324]

[0325] Where, f fcous represents the focal length of the lens, ρ v Indicates the vertical photo repetition, L v Indicates the vertical height of the camera's photosensitive element (vertical field of view angle);

[0326] d v It can also be expressed as:

[0327]

[0328] Where θ v Indicates the vertical observation angle of the camera;

[0329] Step S3402: Acquire an optical photograph of a human body;

[0330] The plurality of cameras 105 collect optical photographs of the human body Data i3Dj3D ;i 3D Indicates the i 3D The human body optical photos collected, i 3D <n 3D ;j 3D Indicates the jth 3D Optical photos of the human body collected by cameras, j 3D <N c ;Data i3Dj3D It can be expressed as:

[0331] Data i3Dj3D =[Data i3D1 Data i3D2 … Data i3Dj3D ]

[0332] All human optical photos acquired by the three-dimensional point cloud measurement subsystem 703, i.e., video monitoring data Data all It can be expressed as:

[0333]

[0334] Step S3403: Determine whether to continue shooting, if so, execute step S3402, otherwise execute step S3404;

[0335] Specifically, the method includes the following steps:

[0336] S34031: Judgment i 3D Is it greater than or equal to n 3D If yes, it indicates that data acquisition is completed and shooting is not continued, and step S3404 is executed; if no, it indicates that shooting is continued and step S34032 is executed;

[0337] S34032: Record the number of times the camera shoots, let i 3D =i 3D +1;

[0338] S34033: Move the linear antenna arrays 101 and 102 to execute step S3402. The moving distance is Δh. The moving distance Δh can be expressed as:

[0339]

[0340] Step S3404: Extracting facial data face ;

[0341] According to the video monitoring data Data obtained by the three-dimensional point cloud measurement subsystem 703 all , select the human optical photo Data with the largest amount of facial information i3Dj3D , based on the human optical photo Data with the largest amount of face information i3Dj3D The whole system control subsystem 1001 extracts the face data Data face ;

[0342] Step S4: high-speed data exchange;

[0343] The radar detection data, body temperature detection data, metal detection data and video monitoring data are transmitted to the industrial control and processing subsystem 10 through the high-speed data exchange subsystem 6;

[0344] Step S5: data processing;

[0345] The full system control subsystem 1001 in the industrial control and processing subsystem 10 is started to perform data processing operations such as imaging processing, image fusion, privacy processing, and face recognition. This step specifically includes:

[0346] Step S51: imaging processing;

[0347] Using a three-dimensional imaging method, such as a wave number domain three-dimensional imaging algorithm or a BP three-dimensional imaging algorithm, the whole system control subsystem 1001 converts the complete scattering data S in the radar detection data into echo (f) performing three-dimensional imaging processing to obtain a three-dimensional scattering map I1 of the target;

[0348] Step S52: image fusion;

[0349] The whole system control subsystem 1001 executes an image fusion program to fuse the human body optical photograph obtained by the 3D point cloud measurement subsystem 703 with the target 3D scattering image I1 to obtain a fused image I2;

[0350] Step S53: privacy processing;

[0351] The whole system control subsystem 1001 executes the target detection program to detect the dangerous goods area in the fused image I2 and performs image processing on the privacy area to obtain the detection image I3;

[0352] Step S54: face recognition;

[0353] The face data Data extracted by the whole system control subsystem 1001 face ; The communication control subsystem 11 is transmitted to the monitoring center subsystem 13, and the monitoring center subsystem 13 is identified, specifically comprising the following steps:

[0354] S541: Obtaining face data face ;

[0355] In order to avoid the face of the person being tested being blocked during the security check, such as intentionally or unintentionally blocking the face with hands or other objects, the face data is obtained. face Failure, the present invention preferably sets at least one face recognition lens at the exit of the security inspection radar, when obtaining the face data Data face If it fails, you can use the face recognition lens to shoot under the guidance of the staff to obtain the face data face ;

[0356] S542: Face data to be processed face Perform data enhancement to obtain data Data1;

[0357] S543: Generate a feature vector Data2 to be processed based on the data Data1 by training a converged anchor-free neural network model;

[0358] The anchor-free neural network model can greatly reduce the number of prediction boxes extracted by the neural network model, reduce the computational complexity of the model, and make the final predicted detection box have good scalability, which helps to improve the recognition effect of objects with large scale changes. It also allows the neural network model to obtain more sufficient semantic information, which is conducive to the detection and recognition of objects in image scenes.

[0359] S544: The face data to be processed face The feature vector Data2 is subjected to item classification and regression to obtain processing result data Data3;

[0360] S545: Obtaining the face data to be processed face The processing result data Data3;

[0361] S546: Information query;

[0362] The communication control subsystem 11 compares the processing result data Data3 with the database data of the monitoring center subsystem 13 to search and obtain the measured person information Data4;

[0363] If the person being tested cannot obtain the information Data4, the face data obtained by the security inspection radar exit is used to identify and mark the person being tested under the guidance of the staff;

[0364] Step S6: image display;

[0365] The processed detection image I3 and the detected person information Date4 are transmitted to the monitoring center subsystem 13 through the communication control subsystem 11 for image display;

[0366] Step S7: Check whether to continue working. If so, return to step S3; otherwise, end.

[0367] In this application, the system default state is to continue working.

[0368] The above content is a further detailed description of the three-dimensional special-shaped planar aperture holographic imaging security inspection radar described in the present invention, and does not limit the scope of the present invention. Without departing from the concept of the present invention, various modifications and improvements made by ordinary technicians in this field based on the technical solution of the present invention should be deemed to fall within the scope of protection of the present invention. < / f2> < / f2>

Claims

1. A three-dimensional special-shaped planar aperture holographic imaging security radar, used to inspect targets within security inspection channels, includes a distributed antenna subsystem, a multi-subband transceiver subsystem, a data acquisition and recording subsystem, a servo motion subsystem, and an industrial control and processing subsystem. Its features include: The distributed antenna subsystem includes at least two linear antenna arrays, each of which is configured to convert a received electrical excitation signal into an electromagnetic wave, which is then transmitted as a transmission signal and receives an echo signal. The distributed antenna subsystem includes a first linear antenna array and a second linear antenna array, which are symmetrically distributed on both sides of the security inspection channel. The first linear antenna array includes a first sparse subarray, a second sparse subarray, and a third sparse subarray connected in sequence. The second linear antenna array includes a fourth sparse subarray, a fifth sparse subarray, and a sixth sparse subarray connected in sequence. Each sparse subarray includes multiple transmitting array elements and multiple receiving array elements. The multi-sub-band transceiver subsystem is communicatively connected to the distributed antenna subsystem, and the multi-sub-band transceiver subsystem is used to generate an electrical excitation signal and receive an echo signal, and perform multi-sub-band demodulation on the echo signal to generate an analog video signal; The data acquisition and recording subsystem is in communication with the multi-sub-band transceiver subsystem, and the data acquisition and recording subsystem is used to perform analog-to-digital conversion sampling and recording on the analog video signal to form radar echo data; The servo motion subsystem is used to drive the distributed antenna subsystem to move in a vertical direction so that the at least two linear antenna arrays form a three-dimensional special-shaped planar aperture in space; before the distributed antenna subsystem moves in the vertical direction, at least one linear antenna array is at the highest point of the three-dimensional special-shaped planar aperture, and at least another linear antenna array is at the lowest point of the three-dimensional special-shaped planar aperture; The industrial control and processing subsystem is in communication with the data acquisition and recording subsystem, and the industrial control and processing subsystem processes the received radar echo data to obtain a detection image.

2. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 1, characterized in that: The first sparse sub-array, the second sparse sub-array, the third sparse sub-array, the fourth sparse sub-array, the fifth sparse sub-array, and the sixth sparse sub-array are symmetrically distributed on both sides of the security inspection channel. The lengths of the first sparse sub-array and the fourth sparse sub-array are equal, the lengths of the second sparse sub-array and the fifth sparse sub-array are equal, and the lengths of the third sparse sub-array and the sixth sparse sub-array are equal.

3. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 1, characterized in that: Each linear antenna array includes three sparse sub-arrays, and each sparse sub-array includes a plurality of transmitting array elements and a plurality of receiving array elements.

4. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to any one of claims 1 to 3, characterized in that: The included angle between two adjacent sparse sub-arrays of each linear antenna array is θ, and the range of θ is 90° to 180°.

5. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to any one of claims 1 to 3, characterized in that: The three sparse sub-arrays of each linear antenna array have the same layout as the transmit and receive elements.

6. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to any one of claims 1 to 3, characterized in that: The number of transmitting elements in each linear antenna array is equal to the number of receiving elements. Multiple transmitting elements are arranged in a line in the horizontal direction. Multiple receiving elements are arranged in a line in the horizontal direction. Multiple transmitting elements are located above multiple receiving elements in the vertical direction. The distance between two adjacent transmitting elements or two adjacent receiving elements is s. The horizontal distance between any transmitting element and an adjacent receiving element is s / 2.

7. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to any one of claims 1 to 3, characterized in that: Each sparse sub-array includes multiple transmit array element groups and multiple receive array element groups. The transmit array element groups and receive array element groups are arranged in a horizontal direction and are alternately distributed. Each transmit array element group includes at least one transmit array element, and each receive array element group includes at least one receive array element.

8. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to any one of claims 1 to 3, characterized in that: Each sparse subarray includes multiple transmit array element groups and multiple receive array element groups. The multiple transmit array element groups are arranged in a horizontal row, and the multiple receive array element groups are arranged in a horizontal row. The multiple receive array element groups are located above the multiple transmit array element groups in a vertical direction. A receive array element group is distributed between two adjacent transmit array element groups. Each transmit array element group includes at least one transmit array element, and each receive array element includes at least one receive array element.

9. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to any one of claims 1 to 3, characterized in that: Each sparse subarray forms a planar aperture, and the planar apertures formed by all sparse subarrays constitute a polygonal three-dimensional special-shaped planar aperture. The height of the three-dimensional special-shaped planar aperture is equal to the maximum distance that the linear antenna array moves in the vertical direction.

10. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 9, characterized in that: The height of the three-dimensional special-shaped plane aperture is 0.2 to 3 meters.

11. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 9, characterized in that: Among the three sparse sub-arrays of each linear antenna array, one sparse sub-array has a length of 0.1 to 1.2 m, and the other two sparse sub-arrays have lengths of 0.1 to 1 m.

12. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 9, characterized in that: The three-dimensional special-shaped planar aperture can achieve height resolution, array resolution and distance resolution.

13. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 1, characterized in that: The three-dimensional special-shaped planar aperture holographic imaging security radar also includes a high-speed switch network subsystem, which is communicatively connected to the distributed antenna subsystem and the multi-sub-band transceiver subsystem. The high-speed switch network subsystem is used to open the transmission channel and the receiving channel, and transmit electrical excitation signals and echo signals between the distributed antenna subsystem and the multi-sub-band transceiver subsystem.

14. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 13, characterized in that: The three-dimensional special-shaped planar aperture holographic imaging security inspection radar further includes a central electronic equipment subsystem, which is communicatively connected to the high-speed switch network subsystem, the multi-sub-band transceiver subsystem, and the data acquisition and recording subsystem. The central electronic equipment subsystem is used to generate a timing trigger pulse that triggers the multi-sub-band transceiver subsystem and the data acquisition and recording subsystem to operate; On the other hand, it is used to control the high-speed switch network subsystem to complete switch switching under its set control logic; the central electronic equipment subsystem is also used to preprocess the radar echo data in the data acquisition and recording subsystem, and the preprocessed radar echo data is returned to the data acquisition and recording subsystem.

15. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 1, characterized in that: The three-dimensional special-shaped planar aperture holographic imaging security radar also includes a high-speed data exchange subsystem, which is communicatively connected to the data acquisition and recording subsystem. The high-speed data exchange subsystem is used to transmit the radar echo data in the data acquisition and recording subsystem to the industrial control and processing subsystem; data retransmission instructions can also be transmitted between the data acquisition and recording subsystem and the high-speed data exchange subsystem.

16. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 1, characterized in that: The three-dimensional special-shaped planar aperture holographic imaging security radar also includes a multi-source sensor subsystem, which includes a temperature measurement subsystem, a metal detection subsystem and a three-dimensional point cloud measurement subsystem, which is used to provide temperature measurement data, metal detection data, and three-dimensional point cloud data of human targets to the industrial control and processing subsystem.

17. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 16, characterized in that: The temperature measurement subsystem is a human infrared sensor, and the three-dimensional point cloud measurement subsystem includes a plurality of cameras, which are distributed in a "one" arrangement in the linear antenna array.

18. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 1, characterized in that: The three-dimensional special-shaped planar aperture holographic imaging security radar also includes a mechanical structure subsystem, a power supply protection subsystem and a monitoring center subsystem. The mechanical structure subsystem is used to provide mechanical structure support for other subsystems, the power supply protection subsystem is used to provide power supply and power supply protection for each subsystem, and the monitoring center subsystem is communicatively connected with the industrial control and processing subsystem, and the monitoring center subsystem is used to provide a comprehensive display of multi-system status and results.

19. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 1, characterized in that: The industrial control and processing subsystem includes a full-system control subsystem, a portable control subsystem, a one-button operation subsystem and an automatic sensing subsystem. The system operation is controlled by the portable control subsystem, the one-button operation subsystem or the automatic sensing subsystem. The full-system control subsystem can perform data processing. The portable control subsystem is a mobile terminal, and the automatic sensing subsystem is a sensor for detecting people entering the system.

20. The three-dimensional special-shaped planar aperture holographic imaging security inspection radar according to claim 19, characterized in that: The three-dimensional special-shaped planar aperture holographic imaging security radar also includes a communication control subsystem, which is communicatively connected to the industrial control and processing subsystem. The communication control subsystem is used to complete the distribution of data between subsystems in the industrial control and processing subsystem.

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