CN102495435B - Calibration method for multichannel transmission delay of body security inspection system - Google Patents
Calibration method for multichannel transmission delay of body security inspection system Download PDFInfo
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- CN102495435B CN102495435B CN 201110361322 CN201110361322A CN102495435B CN 102495435 B CN102495435 B CN 102495435B CN 201110361322 CN201110361322 CN 201110361322 CN 201110361322 A CN201110361322 A CN 201110361322A CN 102495435 B CN102495435 B CN 102495435B
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Abstract
The invention discloses a calibration method for multichannel transmission delay of a body security inspection system, which includes the steps: obtaining transmission delay between an antenna unit and a central position of each channel; determining transmission delay between the antenna unit of each channel and a millimeter wave transceiver before scanning every time; and computing transmission delay between the central position of each channel and the millimeter wave transceiver according to the transmission delay between the antenna unit and the central position of each channel and the transmission delay between the antenna unit of each channel and the millimeter wave transceiver. Therefore, the trouble of placing a calibrator at the central position to be detected every time for calibrating the transmission delay of each detecting channel of the system is omitted, the transmission delay of the system can be calibrated more conveniently in real time, and the working efficiency of the body security inspection system based on millimeter-wave active high-speed columnar rotary scanning three-dimensional holographic imaging is improved.
Description
Technical field
The present invention relates to a kind of delay calibration method.More specifically, the present invention relates to a kind of calibration steps of the human body security check system hyperchannel transmission delay based on the imaging of the active high speed column of millimeter wave rotation sweep 3D hologram.
Background technology
The active column synthetic aperture technique of millimeter wave of having taked the active high speed column of millimeter wave rotation sweep three-dimensional imaging human body security check system realizes the non-formula safety detection of undressing to the personnel to be tested.This safe examination system has taked circumferencial direction machinery rotation sweep and vertical direction switch arrays TURP to change the detection mode that scanning combines, because the difference of multi-channel switch array and aerial array path-length, to cause the inconsistent of interchannel transmission delay, and guarantee that the consistance of each channel transfer time-delay is the key of this safe examination system.
When the transmission delay of the multi-channel switch array of the type safe examination system and aerial array being carried out the consistance calibration in the past, usually the method that adopts is to put the calibration body as calibration target in regional center to be measured, carry out the time domain conversion by the step frequency signal to each transmission channel, obtain the calibration body otdr signal through each passage, can obtain by the transmission delay of millimeter wave transceiver to regional center to be measured position.
But when adopting this mode to carry out delay calibration, all the calibration body need be installed in the center at every turn, the safety check work that continues is made troubles, the work efficiency of safe examination system is reduced.
For overcoming the above problems, need explore the novel calibration steps that to guarantee each communication channel delay consistance calibration accuracy of safe examination system switch aerial array and real-time in conjunction with structure and the principle of work of this type millimeter wave safe examination system.
Summary of the invention
The object of the invention is to provide a kind of calibration steps of human body security check system hyperchannel transmission delay, realizes safe examination system switch aerial array each communication channel delay consistance calibration accuracy and real-time.
This method comprises:
Obtain the antenna element of each passage and the transmission delay between the center;
Before each scanning, determine the antenna element of each passage of this time and the transmission delay between the millimeter wave transceiver;
Antenna element and the antenna element of the transmission delay between the center and described each passage of this time and the transmission delay between the millimeter wave transceiver according to described each passage calculate the center of each passage of this time and the transmission delay between the millimeter wave transceiver.
Further, the antenna element of described each passage of acquisition and the transmission delay between the center comprise:
Place the calibration body at the center in zone to be checked;
Determine the center of each passage and the transmission delay T1 between the millimeter wave transceiver by center calibration body otdr signal
n
Determine the antenna element of each passage and the transmission delay T2 between the millimeter wave transceiver by transmit receive antenna time domain coupled signal
n
Calculate T3
n=T1
n-T2
n, T3 wherein
nBe the antenna element of described each passage and the transmission delay between the center;
Described transmit receive antenna time domain coupled signal is formed by the coupling of the signal between transmission channel and the receiving cable;
N represents the n passage.
Further, obtain the antenna element of described each passage of this time and the transmission delay T2 ' between the millimeter wave transceiver by this time transmit receive antenna time domain coupled signal
n
Further, calculate T1 '
n=T2 '
n+ T3 '
n, T1 ' wherein
nBe the center of each passage of this time and the transmission delay between the millimeter wave transceiver.
The invention has the advantages that: make the trouble that at every turn need place the calibration body in center to be measured has been saved in the calibration of each detection channels transmission delay of system, can conveniently delay time to system transmissions in real time and calibrate, improve the work efficiency based on the human body security check system of the active high speed column of millimeter wave rotation sweep 3D hologram imaging.
Description of drawings
Below with reference to accompanying drawings and in conjunction with the embodiments the present invention is specifically described.
Fig. 1 for the present invention based on the human body security check system master block diagram of the active high speed column of millimeter wave rotation sweep 3D hologram imaging;
Fig. 2 is the top view of Fig. 1;
Fig. 3 is the signal annexation block diagram of millimeter transceiver, switch arrays and passage.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.It is emphasized that the present invention is that example describes with the human body security check system of the active high speed column of the millimeter wave rotation sweep 3D hologram imaging of two millimeter wave switch aerial arrays with subtend rotation and line scanning.Method of the present invention can be used for the safe examination system of single millimeter wave switch aerial array of the prior art, the delay calibration in the time of also can being applied to use hyperchannel transmission signal in the other technologies field.
As depicted in figs. 1 and 2, the human body security check system based on the imaging of the active high speed column of millimeter wave rotation sweep 3D hologram comprises: framework 1, parallel image process computer 2, rotation sweep drive unit 3, system control device 4, control computing machine 5, first millimeter wave transceiver 6, second millimeter wave transceiver 7, the first millimeter wave switch aerial array 8, the second millimeter wave switch aerial array 9, first scanning area 10, second scanning area 11, entrance 12, outlet 13, calibration body 14.
Scanning process is, first millimeter wave transceiver 6 provides detectable signal to the first millimeter wave switch aerial array 8, and second millimeter wave transceiver 7 provides detectable signal to the second millimeter wave switch aerial array 9.The detectable signal that this system uses is the step frequency continuous wave, i.e. ripple continuous and frequency step.By system control device 4 control rotation sweep drive units 3 and first and second millimeter wave transceivers 6,7 make the first and second millimeter wave switch aerial arrays 8,9 respectively in first and second scanning areas 10, in 11 to the described zone to be measured cylinder rotation sweep that walks abreast, according to the spatial positional information from image data and this image data of first and second millimeter wave transceivers, parallel image process computer 2 synthetic personnel to be tested's 3D hologram image.
Among the present invention, millimeter wave transceiver provides detectable signal to millimeter wave switch aerial array, and each antenna element emission receives detectable signal in being passed through by millimeter wave switch aerial array, and by millimeter wave transceiver signal is gathered, in this process, detectable signal the path of process be called passage.
Use first or after the long period uses in safe examination system, under the control of controlling computing machine 5, the first millimeter wave switch aerial array 8 and the second millimeter wave switch aerial array 9 are installed calibration body 14 in regional center to be measured position, adopt the cylindrical metal body in the present embodiment.Under the control of controlling computing machine 5 by first millimeter wave transceiver 6 and second millimeter wave transceiver 7 respectively each passage in the first millimeter wave switch aerial array 8 and the second millimeter wave switch aerial array 9 calibration body 14 emissions of regional center to be measured position are received millimeter wave step frequency continuous wave detectable signals, this signal is after first millimeter wave transceiver 6 and second millimeter wave transceiver 7 are finished data acquisition, send parallel image process computer 2 to and carry out the time domain frequency domain fast fourier transform, to occur transmit receive antenna time domain coupled signal 20 shown in Figure 3 and the calibration body otdr signal 21 of regional center to be measured position after the conversion, wherein transmit receive antenna time domain coupled signal is to be produced by the coupling of the signal between transmission antenna unit and the receiving antenna unit.Thereby because understanding some leakage, the detectable signal that sends to zone to be measured from transmission antenna unit is coupled in the receiving antenna unit, the signal of this coupling returns millimeter wave transceiver and is gathered, and just becomes transmit receive antenna time domain coupled signal after handling through data.
Usually utilize the strongest corresponding time value in position of time-domain signal amplitude as this time-domain signal time measured value, as shown in Figure 3.By the center of time domain echoed signal 21 each passage of acquisition system and the transmission delay T1 between the millimeter wave transceiver
n, the transmit receive antenna time domain coupled signal 20 of each passage of recycling obtains the antenna element of each passage and the transmission delay T2 between the millimeter wave transceiver
n, use T1
nDeduct T2
nCan obtain the antenna element of each passage and the transmission delay T3 between the center
n, with T3
nPreserve.
When safe examination system scans the personnel to be tested at every turn, can not need all to utilize the calibration body that is placed on regional center to be measured position, this time transmit receive antenna time domain coupled signal of gathering when only utilizing this scanning obtains the antenna element of each passage of this time and the transmission delay T2 ' between the millimeter wave transceiver at every turn
n, with T2 '
nWith T3 '
nAddition can obtain the center of each passage of this time and the transmission delay T ' between the millimeter wave transceiver in real time
1
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art is reading on the basis of instructions of the present invention and can make amendment to the technical scheme that each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.Protection scope of the present invention is only limited by the claims of enclosing.
Claims (1)
1. the calibration steps of a human body security check system hyperchannel transmission delay is characterized in that, comprising:
Obtain the antenna element of each passage and the transmission delay between the center, comprising: place the calibration body at the center in zone to be checked; Determine the center of each passage and the transmission delay T1 between the millimeter wave transceiver by center calibration body otdr signal
nDetermine the antenna element of each passage and the transmission delay T2 between the millimeter wave transceiver by transmit receive antenna time domain coupled signal
nCalculate T3
n=T1
n-T2
n, T3 wherein
nBe the antenna element of described each passage and the transmission delay between the center; Described transmit receive antenna time domain coupled signal is formed by the coupling of the signal between transmission channel and the receiving cable; N represents the n passage;
Before each scanning, determine the antenna element of each passage of this time and the transmission delay T2 ' between the millimeter wave transceiver by this time transmit receive antenna time domain coupled signal
n
According to the antenna element of described each passage and the transmission delay T3 between the center
nAnd the antenna element of described each passage of this time and the transmission delay T2 ' between the millimeter wave transceiver
n, calculate the center of each passage of this time and the transmission delay T1 ' between the millimeter wave transceiver
n=T2 '
n+ T3
n
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| CN 201110361322 CN102495435B (en) | 2011-11-15 | 2011-11-15 | Calibration method for multichannel transmission delay of body security inspection system |
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| CN 201110361322 CN102495435B (en) | 2011-11-15 | 2011-11-15 | Calibration method for multichannel transmission delay of body security inspection system |
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| CN102495435A CN102495435A (en) | 2012-06-13 |
| CN102495435B true CN102495435B (en) | 2013-10-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3483637A4 (en) * | 2016-07-06 | 2020-02-19 | China Communication Technology Co., Ltd. | Millimeter wave security inspection instrument debugging system and millimeter wave security inspection instrument debugging method |
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| CN108761552B (en) * | 2018-03-16 | 2021-03-26 | 电子科技大学 | Active millimeter wave human body security check imaging system with dual-channel synchronous detection |
| CN108761553B (en) * | 2018-03-16 | 2021-03-26 | 电子科技大学 | Passive millimeter wave dual-channel synchronous imaging system for security inspection and imaging method thereof |
| CN108693564A (en) * | 2018-03-16 | 2018-10-23 | 电子科技大学 | W-waveband active MMW binary channels synchronous imaging system for human body safety check |
| CN111025423B (en) * | 2019-12-28 | 2022-07-29 | 北京无线电计量测试研究所 | Calibration system and method of active millimeter wave real-time three-dimensional imaging security inspection system |
| CN111999782B (en) * | 2020-07-30 | 2023-02-03 | 北京遥测技术研究所 | Automatic calibration method of rotary scanning imaging system |
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| EP2211155A1 (en) * | 2009-01-21 | 2010-07-28 | Sony Corporation | Method and system to measure noise inserted mm-waves |
| CN201514477U (en) * | 2009-10-30 | 2010-06-23 | 中国航天科工集团第二研究院二○三所 | Wideband lock-phase tracking source device used in calibration system |
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| EP3483637A4 (en) * | 2016-07-06 | 2020-02-19 | China Communication Technology Co., Ltd. | Millimeter wave security inspection instrument debugging system and millimeter wave security inspection instrument debugging method |
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