# US 2018/0321373 A1 · Security inspection system and method using the three-dimensional holographic imaging technology

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- Number: US 2018/0321373 A1
- Document ID: US20180321373A1
- Status: Published application
- Kind: A1
- Application number: 16/034,377
- Filed: 2018-07-13
- Published: 2018-11-08
- Earliest claimed: 2016-04-25
- Assignees: Shenzhen Cct Thz Technology Co., Ltd.; China Communication Technology Co., Ltd.
- Applicants: Shenzhen Cct Thz Technology Co., Ltd.; China Communication Technology Co., Ltd.
- Inventors: Chunchao Qi; Chao Sun; Guangsheng Wu; Shukai Zhao; Qing Ding
- Web page: https://patentgrep.com/patent/US20180321373A1

## CPC

- G01S 13/887: {for detection of concealed objects, e.g. contraband or weapons}
- G01S 7/03: Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
- G01S 13/9088: {Circular SAR [CSAR, C-SAR]}
- H01Q 21/00: Antenna arrays or systems (arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## 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.

## Claims

### Claim 1

A security inspection system using the three-dimensional (3D) holographic imaging technology, comprising a body frame (1) having a to-be-scanned area (10) and at least two scan areas formed therein, the security system further comprising: a millimeter-wave transceiving module (2), at least two millimeter-wave switch antenna arrays, a scan driving device (5) and a parallel-image processing module (4);
the number of the millimeter-wave switch antenna arrays being the same as the number of the scan areas; each of the millimeter-wave switch antenna arrays being connected to the millimeter-wave transceiving module (2) respectively;
the scan driving device (5) being disposed on the body frame (1) and configured to drive the at least two millimeter-wave switch antenna arrays to rotate along a same direction, so that each of the millimeter-wave switch antenna array performs a rotary-scanning operation for an under-test object in the to-be-scanned area (10) within a corresponding scan area respectively;
the parallel-image processing module (4) being configured to synthesize a three-dimensional (3D) holographic image of the under-test object according to echo signals collected by the millimeter-wave transceiving module (2) and spatial position information of the echo signals.

### Claim 2 (depends on 1)

The security inspection system of three-dimensional holographic imaging of claim 1, wherein the at least two scan areas comprises a first scan area (8) and a second scan area (9); the millimeter-wave switch antenna arrays comprises a first millimeter-wave switch antenna array (6) and a second millimeter-wave switch antenna array (7);
the scan driving device (5) drives the first millimeter-wave switch antenna array (6) and the second millimeter-wave switch antenna array (7) to rotate along the same direction, so that the first millimeter-wave switch antenna array (6) and the second millimeter-wave switch antenna array (7) perform the rotary-scanning operation for the under-test object in the to-be-scanned area (10) within the first scan area (8) and the second scan area (9) respectively.

### Claim 3 (depends on 2)

The security inspection system of three-dimensional holographic imaging of claim 2, wherein the millimeter-wave transceiving module (2) comprises: two signal sources, two primary-power dividers, one secondary-power divider, two primary-frequency mixers, and one secondary-frequency mixer, wherein,
an output signal of a first signal source (101) is divided into a 1st path signal and a 2nd path signal after passing through a primary-power divider (102); the 1st path signal is divided into two paths of transmitting signals respectively which enter into two corresponding transmitting antennas after passing through a secondary-power divider (124);
an output signal of a second signal source (117) is divided into a 3rd path signal and a 4th path signal after passing through another primary-power divider (118); the 3rd path signal and the 2nd path signal respectively enter into two input terminals of a first primary-frequency mixer (108), and the 4th path signal and a received signal from a corresponding receiving antenna respectively enter into an LO terminal and an RF terminal of a second primary-frequency mixer (115);
an output signal of the first primary-frequency mixer (108) and an output signal of the second primary-frequency mixer (115) respectively enter into an LO terminal and an RF terminal of a secondary-frequency mixer (114), and an output signal of the secondary-frequency mixer (114) is transmitted to a signal output terminal of the millimeter-wave transceiving module (2).

### Claim 4 (depends on 3)

The security inspection system of three-dimensional holographic imaging of claim 3, the millimeter-wave transceiving module (2) further comprises: a first amplification branch, a second amplification branch, a third amplification branch and a fourth amplification branch;
the 1st path signal enters into an input terminal of the secondary-power divider (124) after being amplified by the first amplification branch;
the 4th path signal and the received signal from the corresponding receiving antenna enter into the LO terminal and the RF terminal of the second primary-frequency mixer (115) after being amplified by the second amplification branch and the third amplification brand respectively;
the output signal of the first primary-frequency mixer (108) enter into the LO terminal of the secondary-frequency mixer (114) after being amplified by the fourth amplification branch.

### Claim 5 (depends on 4)

The security inspection system of three-dimensional holographic imaging of claim 4, wherein the first amplification branch comprises a first power amplifier (103), a first frequency multiplier (104) and a first attenuator (105) that are connected in sequence;
the second amplification branch comprises a third power amplifier (119), a second attenuator (120) and a third frequency multiplier (121) that are connected in sequence;
the third amplification branch comprises a low-noise amplifier (123) and a third wave filter (122) that is connected in sequence; and
the fourth amplification branch comprises a first wave filter (109), a second power amplifier (110), a second frequency multiplier (111), a second wave filter (112) and a fourth power amplifier (113) that are connected in sequence.

### Claim 6 (depends on 5)

The security inspection system of three-dimensional holographic imaging of claim 5, wherein the first amplification branch further comprises an isolator (106), an output terminal of the first attenuator (105) is connected to the input terminal of the third power divider (124) via the isolator (106).

### Claim 7 (depends on 5)

The security inspection system of three-dimensional holographic imaging of claim 5, wherein the first signal source (101) is a frequency modulation (FM) signal source having an operating frequency at a frequency band from 16.1 GHz to 20.1 GHz, and the second signal source (117) is a signal source having an operating frequency at a frequency band from 16 GHz to 20 GHz; and
the first frequency multiplier (104), the second frequency multiplier (111), and the third frequency multiplier (121) are all double frequency multipliers.

### Claim 8 (depends on 1)

The security inspection system of three-dimensional holographic imaging of claim 1, wherein each of the millimeter-wave switch antenna arrays comprises several transmitting antennas and several receiving antennas which are arranged into two rows in a staggered manner;
the millimeter-wave switch antenna arrays are MISO (Multiple Input Single Output) switch antenna arrays.

### Claim 9 (depends on 1)

A security inspection method using the three-dimensional (3D) holographic imaging technology, based on the security inspection system using the three-dimensional holographic imaging technology of claim 1, the security inspection method comprising:
triggering a scan instruction after detecting that an under-test object has entered into a to-be-scanned area;
receiving the scan instruction, and controlling a scan driving device to generate rotation angle information according to a preset rotation control signal, thereby driving at least two millimeter-wave switch antenna arrays to rotate along a same direction so that each of the millimeter-wave switch antenna array performs rotary-scanning operation for the under-test object in the to-be-scanned area in a MISO mode within a corresponding scan area respectively;
transmitting a millimeter-wave signal by a millimeter-wave transceiving module, dividing the millimeter-wave signal into at least two paths of signals, transmitting the at least two paths of signals to a corresponding millimeter-wave switch antenna arrays respectively to be transmitted; collecting echo signals reflected back from the under-test object that are received by each of the at least two millimeter-wave switch antenna arrays as well as spatial position information of the echo signals; and
obtaining a three-dimensional holographic image of the under-test object according to the echo signals and the spatial position information of the echo signals that are collected.

### Claim 10 (depends on 9)

The security inspection method of three-dimensional holographic imaging of claim 9, wherein the security inspection method further comprises:
in the MISO mode of the millimeter-wave switch antenna arrays, transmitting a millimeter-wave signal to the under-test object at a first time point, recording a spatial coverage area of the millimeter-wave signal transmitted at the first time point by a first transmitting antenna of the millimeter-wave switch antenna arrays, and receiving an echo signal corresponding to this millimeter-wave signal through a preset first receiving antenna;
transmitting a millimeter-wave signal to the under-test object again at a second time point, recording a spatial coverage area of the millimeter-wave signal transmitted at the second time point by the first transmitting antenna, and receiving an echo signal corresponding to this millimeter-wave signal through a preset second receiving antenna;
and the step of obtaining a three-dimensional holographic image of the under-test object according to the echo signals and the spatial position information corresponding to the echo signals that are collected comprises:
calculating an overlapped area of the two spatial coverage areas of the millimeter-wave signals transmitted at the two time points; and screening an echo signal corresponding to the overlapped area from the echo signals received by the first receiving antenna and the second receiving antenna; and
determining whether the overlapped area calculated has covered the whole under-test object, and if the determination result is yes, then obtaining the three-dimensional holographic image of the under-test object according to the echo signal of the overlapped area.