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    Close-range microwave imaging method and system
    3.
    发明授权
    Close-range microwave imaging method and system 有权

    公开(公告)号：US11561300B2

    公开(公告)日：2023-01-24

    申请号：US16607577

    申请日：2017-09-04

    Applicant: China Communication Technology Co., Ltd. ,  Shenzhen Victooth Terahertz Technology Co., Ltd.

    Inventor： Chunchao Qi ,  Guangsheng Wu ,  Shukai Zhao ,  Qian Xiao ,  Aixian Wang

    IPC: G01S13/04 ,  G01S13/90 ,  G01S13/88

    Abstract: A close-range microwave imaging method includes: implementing Fourier transform in a pre-set rotation axis direction on an echo signal reflected from a target object and acquired by rotating an array antenna around the pre-set rotation axis to obtain a first echo signal, wherein the first echo signal is represented in polar coordinates; multiplying the first echo signal by a pre-set reference function to obtain a second echo signal; converting the second echo signal into rectangular coordinates by a pre-set algorithm to obtain a third echo signal; and implementing three-dimensional Fourier transform on the third echo signal to obtain three-dimensional image data of the target object. By means of the method, three-dimensional image data of a target object can be obtained fast, fast imaging of the target object can be realized, the data processing amount is small, the imaging precision is high and the method is easy to implement.

    System and method for debugging millimeter wave security inspection instrument
    4.
    发明授权
    System and method for debugging millimeter wave security inspection instrument 有权

    公开(公告)号：US11385380B2

    公开(公告)日：2022-07-12

    申请号：US16315582

    申请日：2017-07-06

    Applicant: CHINA COMMUNICATION TECHNOLOGY CO., LTD ,  SHENZHEN INSTITUTE OF TERAHERTZ TECHNOLOGY AND INNOVATION CO., LTD

    Inventor： Chunchao Qi ,  Chao Sun ,  Shukai Zhao ,  Guangsheng Wu ,  Qing Ding

    IPC: G01V13/00 ,  G01S13/89 ,  G01V8/10

    Abstract: A millimeter wave security inspection instrument debugging system and a millimeter wave security inspection instrument debugging method, which are used for debugging the imaging definition of a millimeter wave holographic imaging security inspection system. A main control apparatus is used for generating a millimeter wave detection signal and a reference signal. The main control apparatus is also used for, where a millimeter wave transmitting antenna, a millimeter wave receiving antenna and a detected object are respectively located at different relative positions, transmitting the millimeter wave detection signal to the detected object by means of the millimeter wave transmitting antenna, and receiving an echo signal reflected from the detected object by means of the millimeter wave receiving antenna, and then using a holographic image technique to perform three-dimensional imaging according to the reference signal and the echo signal. The main control apparatus can finally obtain a plurality of three-dimensional imaging results, so that the optimal relative positions of the millimeter wave transmitting antenna, the millimeter wave receiving antenna and the detected object can be determined, which results are applied to a millimeter wave holographic imaging security inspection system, thereby improving the imaging definition of the millimeter wave holographic imaging security inspection system.

    Charge pump circuit and phase-locked loop
    5.
    发明授权
    Charge pump circuit and phase-locked loop 有权

    公开(公告)号：US11218152B2

    公开(公告)日：2022-01-04

    申请号：US16476391

    申请日：2018-02-05

    Applicant: China Communication Microelectronics Technology Co., Ltd. ,  China Communication Technology Co., Ltd.

    Inventor： Qing Ding ,  Haifeng Zhou ,  Guangsheng Wu ,  Xiaocong Li

    IPC: H03L7/08 ,  H03L7/089 ,  H03L7/091 ,  H03L7/093 ,  H03L7/099 ,  H02M3/07

    Abstract: A charge pump circuit and phase-locked loop include start, bias, current mirror, charging and discharging feedback control, and charging and discharging matching modules, which are electrically connected in sequence. The start module starts the bias module. The bias module generates constant bias current and outputs same to the current mirror module, which receives and amplifies the bias current for output in two paths. The charging and discharging feedback control module detects the output voltage of a charge pump and controls, according to feedback of the output voltage, the current in the charging and discharging matching module, to suppress the mismatch between charging and discharging currents. The charging and discharging matching module receives an external charging or discharging control signal, to charge or discharge the output load of the charge pump. Charging and discharging currents can be matched within a wide output voltage range, without an operational amplifier.

    Apparatus and method for security check of multiple human bodies based on linear frequency modulation
    6.
    发明授权
    Apparatus and method for security check of multiple human bodies based on linear frequency modulation 有权

    公开(公告)号：US11163058B2

    公开(公告)日：2021-11-02

    申请号：US16065998

    申请日：2016-01-27

    Applicant: SHENZHEN CCT THZ TECHNOLOGY CO., LTD. ,  CHINA COMMUNICATION TECHNOLOGY CO., LTD.

    Inventor： Chunchao Qi ,  Shukai Zhao ,  Beibei Liu ,  Guangsheng Wu ,  Qing Ding ,  Xiongwei Huang ,  Juncheng Liu ,  Chengyan Jia ,  Yandong Zhang ,  Yanli Liu

    IPC: G01S13/88 ,  G01S13/89 ,  G01S13/34 ,  G01S7/03 ,  G01S7/35

    Abstract: This invention provides a security check apparatus for multiple human bodies based on linear frequency modulation, which comprises a scanning device, a millimeter wave signal transceiver module, and an image processing unit. The scanning device comprises several detection seats and several guideways and motors arranged on the detection seats; the detection seats are configured to accommodate persons to be security checked; a set of the millimeter wave signal transceiver modules are arranged on each guideway, and each millimeter wave signal transceiver module is driven by the motor to move along the guideway; the several detection seats are arranged in longitudinal direction. The millimeter wave signal transceiver modules are configured to transmit millimeter wave signals to the persons to be security checked and receive millimeter wave signals reflected from the persons to be security checked. The image processing unit is configured to perform holographic 3D imaging on the human bodies of the persons to be security checked based on the reflected millimeter wave signals to obtain 3D images of the human bodies. This invention also provides a security check method for multiple human bodies based on linear frequency modulation. This invention has the advantages of low cost, simple structure, easy integration, high resolution, more persons are detected per unit time, and no radiation hazard to human bodies.

    Security inspection system and method using the three-dimensional holographic imaging technology
    8.
    发明授权
    Security inspection system and method using the three-dimensional holographic imaging technology 有权

    公开(公告)号：US10551490B2

    公开(公告)日：2020-02-04

    申请号：US16034377

    申请日：2018-07-13

    Applicant: SHENZHEN CCT THZ TECHNOLOGY CO., LTD. ,  CHINA COMMUNICATION TECHNOLOGY CO., LTD.

    Inventor： Chunchao Qi ,  Chao Sun ,  Guangsheng Wu ,  Shukai Zhao ,  Qing Ding

    IPC: G01S13/88 ,  G01S13/90 ,  G01S7/03 ,  H01Q21/00

    Abstract: The present disclosure relates to a security inspection system and method using the three-dimensional holographic imaging technology. The system comprises: a body frame; a millimeter-wave transceiving module, disposed on the body frame; and at least two millimeter-wave switch antenna arrays, connected with the millimeter-wave transceiving module; the number of the millimeter-wave switch antenna arrays being the same as that of the scan areas; a scan driving device, configured to drive the at least two millimeter-wave switch antenna arrays to rotate along the same direction; a control device, configured to control the scan driving device to generate a rotation angle signal; and a parallel-image processing module, configured to synthesize a three-dimensional holographic image of an under-test object according to echo signals collected by the millimeter-wave transceiving module and spatial position information of the echo signals. The present disclosure simplifies the system structure and improves the imaging resolution.

    MILLIMETER WAVE IMAGING APPARATUS
    9.
    发明申请
    MILLIMETER WAVE IMAGING APPARATUS 审中-公开

    公开(公告)号：US20190353776A1

    公开(公告)日：2019-11-21

    申请号：US16323206

    申请日：2016-08-09

    Applicant: CHINA COMMUNICATION TECHNOLOGY CO., LTD. ,  SHENZHEN INSTITUTE OF TERAHERTZ TECHNOLOGY AND INNOVATION CO., LTD.

    Inventor： Juncheng LIU ,  Chao SUN ,  Chunchao QI

    IPC: G01S13/88 ,  G01S13/89 ,  G01S7/35 ,  G01S7/03

    Abstract: A millimeter wave imaging apparatus includes a crystal oscillator, a power divider, a millimeter wave transceiver unit, a local-oscillation signal processing unit, a second frequency mixer and an image processing device; the power divider performs power distribution on an oscillation signal generated by the crystal oscillator, and outputs a clock trigger signal and a local-oscillation signal; the local-oscillation signal processing device processes the local-oscillation signal and outputs a second local-oscillation signal; the millimeter wave transceiver unit processes an echo signal reflected by an object to be detected, and outputs a first intermediate-frequency signal; the second frequency mixer mixes the second local-oscillation signal and the first intermediate-frequency signal, and outputs a second intermediate-frequency signal; the image processing module processes the second intermediate-frequency signal, and images the object to be detected.

    POWER ADJUSTMENT METHOD AND APPARATUS, AND HUMAN BODY SECURITY CHECK DEVICE
    10.
    发明申请
    POWER ADJUSTMENT METHOD AND APPARATUS, AND HUMAN BODY SECURITY CHECK DEVICE 审中-公开

    公开(公告)号：US20190260121A1

    公开(公告)日：2019-08-22

    申请号：US16331113

    申请日：2017-09-06

    Applicant: CHINA COMMUNICATION TECHNOLOGY CO., LTD. ,  SHENZHEN INSTITUTE OF TERAHERTZ TECHNOLOGY AND INNOVATION

    Inventor： Chunchao QI ,  Shukai ZHAO ,  Hanjiang CHEN ,  Beibei LIU

    IPC: H01Q3/22 ,  G01S13/89 ,  G01V8/20 ,  G06F17/14

    Abstract: A power adjustment method and apparatus, and a human body security check device are disclosed. The method may be applied in a human body security check device or an inspection device provided with a millimeter wave transceiver and comprises: obtaining a current humidity value by detecting the ambient humidity around the millimeter wave transceiver using a preset humidity sensor; determining a target power attenuation value of the adjustable power attenuator according to the current humidity value, the sum of the target power attenuation value and a power attenuation value caused to a millimeter wave signal by the ambient humidity being a constant value; and controlling the adjustable power attenuator to adjust its power attenuation value to be consistent with the target power attenuation value. An adjustable power attenuator is provided in a millimeter wave signal transmitting link of the millimeter wave transceiver.

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