CN112269214B - Millimeter wave security inspection system and security inspection method with both heartbeat measurement and imaging functions - Google Patents
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- G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
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- A61B5/024—Measuring pulse rate or heart rate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
- A61B5/024—Measuring pulse rate or heart rate
- A61B5/02444—Details of sensor
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
本发明涉及一种兼具心跳测量和成像功能的毫米波安检系统及安检方法，可以同时通过毫米波成像和心跳测量完成被检人的检测，从而提高检测效率。另外某些体内藏毒的危险分子，也可以通过心跳测量的结果，进一步提高检测效率。本发明采用多通道心跳测量的方法，并与三维成像结果相映射，从而自适应被检人的身高和心脏位置，提高了心跳测量的准确率。
The present invention relates to a millimeter wave security inspection system and a security inspection method with both heartbeat measurement and imaging functions, which can simultaneously complete the inspection of the inspected person through millimeter wave imaging and heartbeat measurement, thereby improving the inspection efficiency. In addition, certain dangerous molecules hiding drugs in the body can also be further inspected through the results of heartbeat measurement to improve the inspection efficiency. The present invention adopts a multi-channel heartbeat measurement method and maps it with the three-dimensional imaging results, thereby adapting to the height and heart position of the inspected person and improving the accuracy of heartbeat measurement.
Description
Technical Field
The invention relates to the field of millimeter wave security inspection imaging, in particular to a millimeter wave security inspection system and a security inspection method with heartbeat measurement and imaging functions.
Background
Traditional security measures have not met the current security market demands. The traditional metal detector can only detect the metal contraband, has no ability to the plastic bomb and the ceramic cutter, and the X-ray security inspection equipment can detect all the contraband, but has a certain threat to the human health, thus being not the optimal security inspection means. The current millimeter wave three-dimensional imaging technology is an effective method for replacing the traditional security inspection means. The cylindrical scanning three-dimensional imaging system is a main millimeter wave three-dimensional imaging system in the market at present. The cylindrical scanning three-dimensional imaging system images through two perpendicular antenna arms in a rotary scanning mode, but the existing security inspection system has the defects that the automatic identification accuracy is low, and articles hidden in a human body cannot be detected.
Disclosure of Invention
The millimeter wave security inspection system with heartbeat measurement and imaging functions solves the technical problems of overcoming the defects of the prior art, and achieves measurement of human body heartbeats by adding a millimeter wave heartbeat measurement module in the middle of circumferential scanning, and improves detection and identification probability of suspicious people by intelligently fusing the measurement result and imaging detection result.
The solution of the invention is as follows:
a millimeter wave security inspection system with heartbeat measurement and imaging functions comprises a servo mechanism, a left antenna arm, a right antenna arm, a processor and a heartbeat detection module;
The left antenna arm and the right antenna arm are vertically connected to the servo mechanism and rotate for a certain angle under the drive of the servo mechanism, the left antenna arm and the right antenna arm are symmetrically distributed about the rotation axis of the servo mechanism,
A heartbeat detection module is arranged at the center position of the inner side of the cambered surface envelope formed by the rotation of the left antenna arm, and is fixed when the servo mechanism drives the left antenna arm and the right antenna arm to rotate;
the left antenna arm and the right antenna arm each comprise a plurality of antenna modules;
After the processor sends out a control instruction and drives the antenna arm to rotate to a preset angle through the servo mechanism, the heartbeat detection module is controlled to perform electric scanning, then the antenna modules on the left antenna arm and the right antenna arm start to work sequentially from top to bottom to perform electric scanning, after the electric scanning of the whole antenna arm under the current angle is completed, the antenna arm rotates to the next angle to restart the electric scanning, and electric scanning data of all scanning angles are sent to the processor to perform danger identification processing to obtain heartbeat frequency data of a security check person.
Further, the left antenna arm and the right antenna arm each comprise 12 antenna modules, each antenna module is an antenna array and comprises H transmitting units and H receiving units, and the heartbeat detection module is an antenna array and comprises H transmitting units and H receiving units.
Further, the processor controls the heartbeat detection module and the left and right antenna arms to start electric scanning respectively according to the following time sequence:
firstly, controlling a heartbeat detection module to start electric scanning, wherein antenna units arranged on the heartbeat detection module adopt a single-shot single-reception working mode in which only one transmitting antenna unit works each time and only one receiving antenna unit works each time from top to bottom, and sequentially completing the working of all transmitting units and all receiving units;
And after the electric scanning of the heartbeat detection module is finished, controlling the vertical left and right antenna arms to start the electric scanning simultaneously or respectively, wherein the left and right antenna arms adopt the receiving and transmitting time sequences that only one transmitting antenna unit works and one receiving antenna unit works from top to bottom at a time.
Further, under the drive of the servo mechanism, the left and right antenna arms rotate by θ degrees at an angle interval of Δθ, and scan M angles altogether, wherein m=θ/Δθ, the heartbeat detection module obtains an echo signal of N 0 ×h at each angle, N 0 is the sampling point number in the distance direction, and after the left and right antenna arms rotate by M angles, the heartbeat detection module obtains M echo signals of N 0 ×hThe left and right antenna arms each obtain 12M N 0 x H echo signals.
Further, the rotation angle θ ranges from 90 ° to 130 °, and the angular interval Δθ ranges from 0.4 ° to 0.6 °.
Further, the processor performs risk identification processing to obtain heartbeat frequency data of the security check person, and specifically includes the following steps:
(1) The three-dimensional echo data, which are obtained by rotating the two antenna arms and are except for the heartbeat detection module, are imaged through a wave number domain imaging algorithm to obtain a three-dimensional image;
(2) According to the echo data of the heartbeat detection module obtained under the initial angle, carrying out a two-dimensional distance-Gao Chengcheng image on the echo data of the heartbeat detection module obtained under the initial angle through a two-dimensional omega-k algorithm;
(3) Finding the position of the heart in the elevation direction in the three-dimensional image in the step (1);
(4) Mapping the position of the elevation direction of the heart found in the step (3) into the two-dimensional distance-elevation image obtained in the step (2) through interpolation;
(5) Obtaining the maximum value along the distance direction at the heart elevation position obtained by mapping in the step (4);
(6) Repeating the steps (2) - (5) until the echo data obtained by the heartbeat detection module under all M angles are processed, and obtaining M signals with distance to the maximum value;
(7) Respectively carrying out correlation processing on M distance-oriented maximum signals and a plurality of sinusoidal signals with different primary phases and frequencies from 1Hz to 2 Hz;
(8) And taking the maximum value of the correlation processing result, and the sinusoidal signal corresponding to the maximum value of the distance-to-maximum value signal correlation processing result is the signal corresponding to heartbeat and respiration.
Further, imaging processing is performed to obtain a three-dimensional image, specifically, 12M echo signals are obtained through a wave number domain algorithm12M imaging results of (2)
Where k is the wave number in the distance direction, k x is the wave number in the azimuth direction, and R 0 is the reference distance.
Furthermore, the invention also provides a security inspection method, which comprises the following steps:
(a) Acquiring 360-degree echo data of a human body through 12 antenna arrays of a left antenna arm and 12 antenna arrays of a right antenna arm, completing three-dimensional imaging through an imaging algorithm of a wave number domain, identifying the position of a suspicious object according to a three-dimensional imaging result, and judging whether a person to be detected is suspicious or not;
(b) Simultaneously performing heartbeat detection, and judging whether the detected person is suspicious or not through the heartbeat frequency;
(c) If the two methods are simultaneously or one method is adopted to judge that the detected person is suspicious, judging that the detected person is a suspicious person;
(d) And if the two methods judge that the detected person is normal, releasing.
Performing heartbeat detection, judging whether the detected person is suspicious or not through the heartbeat frequency, and specifically comprising the following steps:
(1) The three-dimensional echo data, which are obtained by rotating the two antenna arms and are except for the heartbeat detection module, are imaged through a wave number domain imaging algorithm to obtain a three-dimensional image;
(2) According to the echo data of the heartbeat detection module obtained under the initial angle, carrying out a two-dimensional distance-Gao Chengcheng image on the echo data of the heartbeat detection module obtained under the initial angle;
(3) Finding the position of the heart in the elevation direction in the three-dimensional image in the step (1);
(4) Mapping the position of the elevation direction of the heart found in the step (3) into the two-dimensional distance-elevation image obtained in the step (2) through interpolation;
(5) Obtaining the maximum value along the distance direction at the heart elevation position obtained by mapping in the step (4);
(6) Repeating the steps (2) - (5) until the echo data obtained by the heartbeat detection module under all M angles are processed, and obtaining M signals with distance to the maximum value;
(7) Respectively carrying out correlation processing on M distance-oriented maximum signals and a plurality of sinusoidal signals with different primary phases and frequencies from 1Hz to 2 Hz;
(8) And taking the maximum value of the correlation processing result, namely the sinusoidal signal corresponding to the maximum value of the correlation processing result from the distance to the maximum value signal is the signal corresponding to the heartbeat and the respiration, and judging whether the sinusoidal signal is a suspicious person according to the heartbeat range of a normal person and the heartbeat range of a criminal.
Compared with the prior art, the invention has the beneficial effects that:
The millimeter wave security inspection system with the heartbeat measurement and imaging capability can finish the detection of the inspected person through millimeter wave imaging and heartbeat measurement at the same time, thereby improving the detection efficiency. In addition, certain dangerous molecules with toxin stored in the body can also further improve the detection efficiency through the heartbeat measurement result. The invention adopts a multichannel heartbeat measurement method and maps with a three-dimensional imaging result, thereby self-adapting to the height and heart position of the examined person and improving the accuracy of heartbeat measurement.
Drawings
FIG. 1 is a schematic diagram of a millimeter wave security inspection system with both heartbeat measurement and imaging functions;
FIG. 2 is a flowchart of the heartbeat detector operation;
fig. 3 millimeter wave security imaging flow chart.
Detailed Description
The invention is further illustrated below with reference to examples.
The conventional millimeter wave security inspection equipment adopts vertical antenna arm circumferential scanning to obtain three-dimensional echo data, and the echo data obtained by the method has the defects of low automatic identification accuracy and incapability of detecting articles hidden in a human body.
In order to improve the detection accuracy of a detected person, the invention provides a millimeter wave security inspection system with the functions of heartbeat measurement and imaging, wherein the device is provided with the function of heartbeat detection while maintaining imaging identification detection, and the suspicious degree of the detected person is judged together through intelligent identification by an imaging result and a heartbeat detection result.
As shown in FIG. 1, the millimeter wave security inspection system with heartbeat measurement and imaging functions provided by the invention comprises a servo mechanism 101, a left antenna arm 103, a right antenna arm 104, a processor and a heartbeat detection module 102;
The left antenna arm and the right antenna arm are vertically connected to the servo mechanism and rotate for a certain angle under the drive of the servo mechanism, the left antenna arm and the right antenna arm are symmetrically distributed about the rotation axis of the servo mechanism,
A heartbeat detection module 102 is arranged at the center position of the inner side of the cambered surface envelope formed by the rotation of the left antenna arm, and is fixed when the servo mechanism drives the left antenna arm and the right antenna arm to rotate;
The left and right antenna arms each include a plurality of antenna modules 105;
After the processor sends out a control instruction and drives the antenna arm to rotate to a preset angle through the servo mechanism, the heartbeat detection module is controlled to perform electric scanning, then the antenna modules on the left antenna arm and the right antenna arm start to work sequentially from top to bottom to perform electric scanning, after the electric scanning of the whole antenna arm under the current angle is completed, the antenna arm rotates to the next angle to restart the electric scanning, and electric scanning data of all scanning angles are sent to the processor to perform danger identification processing to obtain heartbeat frequency data of a security check person.
The left antenna arm and the right antenna arm respectively comprise 12 antenna modules, each antenna module is an antenna array and comprises H transmitting units and H receiving units, and the heartbeat detection module is an antenna array and comprises H transmitting units and H receiving units.
The processor controls the heartbeat detection module and the left antenna arm and the right antenna arm to respectively start electric scanning according to the following time sequence:
firstly, controlling a heartbeat detection module to start electric scanning, wherein antenna units arranged on the heartbeat detection module adopt a single-shot single-reception working mode in which only one transmitting antenna unit works each time and only one receiving antenna unit works each time from top to bottom, and sequentially completing the working of all transmitting units and all receiving units;
And after the electric scanning of the heartbeat detection module is finished, controlling the vertical left and right antenna arms to start the electric scanning simultaneously or respectively, wherein the left and right antenna arms adopt the receiving and transmitting time sequences that only one transmitting antenna unit works and one receiving antenna unit works from top to bottom at a time.
Under the drive of a servo mechanism, the left and right antenna arms rotate for theta degrees at an angle interval of delta theta, M angles are scanned altogether, M=theta/delta theta is provided, the heartbeat detection module obtains an N 0 XH echo signal at each angle, N 0 is the sampling point number in the distance direction, and after the left and right antenna arms rotate for M angles, the heartbeat detection module obtains M N 0 XH echo signalsThe left and right antenna arms each obtain 12M N 0 x H echo signals. The rotation angle theta of the invention ranges from 90 degrees to 130 degrees, and the angle interval delta theta ranges from 0.4 degrees to 0.6 degrees.
As shown in fig. 2, the processor performs hazard discrimination processing to obtain heartbeat frequency data of the security check person, and processes the frequency of the human body heartbeat through two-dimensional echo data of a plurality of angles.
The method specifically comprises the following steps:
(1) The three-dimensional echo data, which are obtained by rotating the two antenna arms and are except for the heartbeat detection module, are imaged through a wave number domain imaging algorithm to obtain a three-dimensional image;
12M echo signals are obtained through a wave number domain algorithm 12M imaging results of (2)
Where k is the wave number in the distance direction, k x is the wave number in the azimuth direction, and R 0 is the reference distance.
And carrying out three-dimensional imaging processing on the cylindrical scanning three-dimensional echo data by a wave number domain imaging algorithm. The height and the heart position of the detected person are extracted from the three-dimensional data.
(2) According to the echo data of the heartbeat detection module obtained under the initial angle, carrying out a two-dimensional distance-Gao Chengcheng image on the echo data of the heartbeat detection module obtained under the initial angle through a two-dimensional omega-k algorithm;
(3) Finding the position of the heart in the elevation direction in the three-dimensional image in the step (1);
(4) Mapping the position of the elevation direction of the heart found in the step (3) into the two-dimensional distance-elevation image obtained in the step (2) through interpolation;
the position corresponding to the heart in the two-dimensional image is maximized in the distance direction Position and phase of the position
(5) Obtaining the maximum value along the distance direction at the heart elevation position obtained by mapping in the step (4);
(6) Repeating the steps (2) - (5) until the echo data obtained by the heartbeat detection module under all M angles are processed, and obtaining M signals with distance to the maximum value;
the maximum value composition of the M auxiliary image is as follows
(7) Respectively performing correlation processing on M distance direction maximum signals and a plurality of sinusoidal signals with different primary phases and frequencies of 1 Hz-2 Hz, namely, performing correlation processing on the functionWith 1Hz to 2Hz sine and performing correlation processing on the signals.
(8) And taking the maximum value of the correlation processing result, and the sinusoidal signal corresponding to the maximum value of the distance-to-maximum value signal correlation processing result is the signal corresponding to heartbeat and respiration. The position of the maximum value of the Fourier transformation of the related signals is the frequency of the heartbeat of the human body. And judging whether the person is suspicious according to the heartbeat range of normal persons and the heartbeat range of criminals provided by psychologists and public security authorities.
The millimeter wave security inspection system with the heartbeat measurement and imaging capability can finish the detection of the inspected person through millimeter wave imaging and heartbeat measurement at the same time, thereby improving the detection efficiency. In addition, certain dangerous molecules with toxin stored in the body can also further improve the detection efficiency through the heartbeat measurement result. The invention adopts a multichannel heartbeat measurement method and maps with a three-dimensional imaging result, thereby self-adapting to the height and heart position of the examined person and improving the accuracy of heartbeat measurement.
The embodiment of the invention comprises the following steps:
as shown in fig. 3, a flowchart of millimeter wave security inspection imaging is performed.
Echo data of 360 degrees of human body are obtained through the 12 antenna arrays of the left antenna arm and the 12 antenna arrays of the right antenna arm, three-dimensional imaging is completed through an imaging algorithm of a wave number domain, the position of a suspicious object is identified according to a three-dimensional imaging result, and whether a person to be detected is suspicious is judged.
At the same time, heart beat detection is carried out, and whether the person to be detected is suspicious or not is judged through the heart beat frequency;
If the two methods are simultaneously or one method is adopted to judge that the detected person is suspicious, the detected person is judged to be the suspicious person. And if the two methods judge that the detected person is normal, releasing.
The invention can improve the accuracy of suspicious person discrimination by adding the heartbeat detection function on the basis of millimeter wave three-dimensional imaging. And the reliability of millimeter wave security check imaging is improved.
The invention is not described in detail in part as being common general knowledge to a person skilled in the art.
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| WO2015174879A1 (en) * | 2014-05-14 | 2015-11-19 | Novelic D.O.O. | Mm-wave radar vital signs detection apparatus and method of operation |
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| CN104375141A (en) * | 2013-08-15 | 2015-02-25 | 同方威视技术股份有限公司 | Millimeter wave three-dimensional holoscan imaging device and checking method |
| CN105759269B (en) * | 2016-04-25 | 2018-06-26 | 华讯方舟科技有限公司 | The safe examination system and method for 3D hologram imaging |
| CN207143786U (en) * | 2017-08-30 | 2018-03-27 | 深圳安盟时代科技有限公司 | Multi-functional detection detector gate |
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| CN110308443B (en) * | 2018-07-19 | 2021-07-30 | 北京理工大学 | A real-beam electrical scanning fast imaging human body security inspection method and security inspection system |
| CN109300287A (en) * | 2018-09-13 | 2019-02-01 | 芜湖博高光电科技股份有限公司 | A kind of prison prison house vital sign monitoring system |
| CN109975337A (en) * | 2019-04-15 | 2019-07-05 | 深圳市创艺龙电子科技有限公司 | A kind of novel security inspection equipment and intelligent checking system |
| CN110794399B (en) * | 2019-10-29 | 2022-03-29 | 北京无线电计量测试研究所 | Active millimeter wave three-dimensional imaging security inspection device |
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