CN106501793B - The device and method for calibrating plate calibration body and thz beam angle - Google Patents
The device and method for calibrating plate calibration body and thz beam angle Download PDFInfo
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- CN106501793B CN106501793B CN201610948536.5A CN201610948536A CN106501793B CN 106501793 B CN106501793 B CN 106501793B CN 201610948536 A CN201610948536 A CN 201610948536A CN 106501793 B CN106501793 B CN 106501793B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
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Abstract
A kind of device and method for calibrating plate calibration body and thz beam angle, the device for calibrating plate calibration body and thz beam angle includes Metal pylon pedestal, it includes horizontal translation platforms and vertical translation platform, turntable is arranged on Metal pylon pedestal, pitching platform is arranged on turntable, plate calibration body is placed on the device of calibration plate calibration body and thz beam angle, mobile and horizontal translation stage measures the azimuth angle deviation between plate calibration body and thz beam, pitch angle deviation between mobile vertical translation platform measurement plate calibration body and thz beam, azimuth angle deviation is compensated using turntable, pitch angle deviation is compensated using pitching platform, it is orthogonal posture by plate calibration body and the angle calibration system of thz beam.The present invention, to determine parameter to calibrate plate calibration body and thz beam angle, is saved prover time, reduces calibration cost by the mobile target of translation stage.
Description
Technical field
The present invention relates to electromagnetic scattering the field of test technology, more particularly to a kind of terahertz wave band monostatic radar that is suitable for dissipate
Penetrate the calibration plate calibration body based on time-domain spectroscopic technology of section (Radar Cross Section, RCS) measuring system with too
The device and method of hertz beam angle.
Background technique
When carrying out rcs measurement to target using electromagnetic scattering test macro, it usually needs obtain the backward mono- static RCS of target
Data are for use as target scattering characteristics assessment, target identification etc..And a key link in rcs measurement is exactly determining for data
Mark, i.e., establish stringent mathematical relationship between power (or voltage) the signal numerical value measured and RCS.Calibrating method is divided into absolutely
It demarcates and two kinds of relative Calibration.Absolute calibration's method is usually used in measuring target range, is setting up boresight tower at a distance from several kms of radar, is utilizing
The radar transmission power that boresight tower receives and radar receive the substitutional relation between the calibration power emitted on boresight tower to ask
Obtain the RCS value of object to be measured.Relative Calibration method is by coming to the ratio of power (or voltage) measured by calibration body and object to be measured
Calculate target RCS value.
In the rcs measurement system based on terahertz time-domain spectroscopic technology, the emission source (photoconductive antenna that is used due to it
Or electro-optic crystal) transmitting time domain broadband terahertz pulse signal include frequency component abundant, existing vector network analysis
Instrument is unable to measure the terahertz signal amplitude and phase of 1THz frequencies above, and the Terahertzs power such as high Lay box based on fuel factor is visited
Survey device can not then measure respectively the signal strength of each frequency and dynamic range is small can not be real to less power terahertz signal
Now preferable measurement accuracy.
The parameters such as the transmission power of photoconductive Terahertz antenna and bias voltage, pump laser power and antenna light resistance are close
Cut phase is closed, and has been difficult to accurate calculation formula.And based on the terahertz signal of electro-optic detection method measurement record be signal
Relative intensity rather than absolute power numerical value, therefore the rcs measurement based on terahertz time-domain spectroscopic technology is difficult with absolutely
Scaling method, and be only suitable for using relative calibration method.
In the quasi- mono- static RCS time domain measurement device of existing Terahertz, such as the Krzysztof et al. of Technical University Of Denmark
(Terahertz radar cross section measurements, Optics Express, 2010 (18), 26399) structure
It has built the single station time-domain spectroscopy of the standard that dual station angle is 6.6 ° and has tightened the Liang Dachuan of field measurement device and University Of Tianjin et al. (scale model
Wideband time domain Terahertz radar cross section (RCS) research, Acta Physica Sinica, 2014 (63), 214102) building dual station angle be
9 ° of terahertz time-domain rcs measurement system, is all made of relative calibration method.Both sentencing based on time domain impulsive signals maximum value
Determine method, specific practice is the metal ball that a series of different-diameters of selection are much larger than wavelength, and it is flat to be proportional to diameter using sphere RCS
The property of side, with different-diameter than when the time domain impulsive signals maximum value that measures carry out the calibration of RCS.But it is this to be believed based on time domain
The method of number maximum value is that the summation of each frequency component is utilized, since each frequency component power of antenna transmitting is not identical
And it is difficult to use as the RCS relative calibration of each frequency component.
Usually select metal pros plate, Dihedral Corner Reflectors and Long Bai globe lens reflector etc. that there is parsing RCS value
Standard body is used as relative calibration.In order to obtain the accurate measurement data of calibration body so that subsequent RCS is demarcated, first have to determine
The posture of calibration body relative exposure thz beam.Thz beam naked eyes are invisible, and rise in terahertz wave band to target RCS
The mirror-reflection azimuthal of main contributions effect is very sensitive, then needs to carry out calibration body posture accurate adjustment.Such as adopt
With the posture of the large-scale instruments such as laser total station measurement target relative antenna, (patent of invention: a kind of near-field target symmetrically polarizes rcs
Test method, publication number CN102401893B), but using the higher cost of the large-scale instruments such as laser total station.Or use turntable
Rotating Plates find maximum scattering direction to calibrate a kind of plate azimuth (patent of invention: reflectivity survey based on laser ranging
Try automatic calibrating method, publication number CN103674898B), it uses toward calibration body implements internal injection mercury to adjust horizontal attitude
(patent of invention: a kind of robot scaling equipment towards extremely low rcs target measurement, publication number CN105242250A), both methods need
The time-domain signal that different orientations are recorded with high resolution scanning carries out exhaustion, needs to expend a large amount of time of measuring.
Summary of the invention
The present invention provides a kind of device and method for calibrating plate calibration body and thz beam angle, is moved by translation stage
Moving-target saves prover time, reduces calibration to determine parameter to calibrate plate calibration body and thz beam angle
Cost.
In order to achieve the above object, the present invention provides a kind of device for calibrating plate calibration body and thz beam angle,
Include:
Metal pylon pedestal, it includes horizontal translation platform and vertical translation platform, horizontal translation platform is for measuring plate calibration
Azimuth angle deviation between body and thz beam, vertical translation platform is for measuring between plate calibration body and thz beam
Pitch angle deviation；
Turntable is arranged on Metal pylon pedestal, for compensating the orientation between plate calibration body and thz beam
Angular displacement；
Pitching platform is arranged on Metal pylon pedestal, and plate calibration body is arranged on pitching platform or turntable by bracket,
The pitching platform is used to compensate the pitch angle deviation between plate calibration body and thz beam.
The present invention also provides a kind of devices using the calibration plate calibration body and thz beam angle to calibrate
The method of plate calibration body and thz beam angle comprising the steps of:
Plate calibration body is placed on the device of calibration plate calibration body and thz beam angle；
Mobile and horizontal translation stage measures the azimuth angle deviation between plate calibration body and thz beam, mobile vertical translation
Platform measures the pitch angle deviation between plate calibration body and thz beam；
Azimuth angle deviation is compensated using turntable, pitch angle deviation is compensated using pitching platform, by plate calibration body and Terahertz
The angle calibration system of light beam is orthogonal posture.
The method of azimuth angle deviation between the mobile and horizontal translation stage measurement plate calibration body and thz beam
It comprises the steps of:
By constant spacing mobile and horizontal translation stage and records the reflected terahertz of target in each moving distance hereby time domain is believed
Number spectrum；
The time-domain position in each moving distance where signal pulse maximum value is extracted, to moving horizontally away from discrete pulses
Maximum value time-domain position carries out straight line fitting using least square method；
Azimuth angle deviation of the azimuth relative to 0 degree of position is calculated according to straight slope reverse simulation
Wherein,It is the slope of fitting a straight line, c is the vacuum light speed as unit of mm, so thatDimension become
It is 1.
The method of azimuth angle deviation between the mobile and horizontal translation stage measurement plate calibration body and thz beam
In, before mobile and horizontal translation stage, first coarse adjustment turntable makes plate calibration body surface close and beam propagation under visual situation
Direction is orthogonal.
The method of pitch angle deviation between the mobile vertical translation platform measurement plate calibration body and thz beam
It comprises the steps of:
By the mobile vertical translation platform of constant spacing and records the reflected terahertz of target in each moving distance hereby time domain is believed
Number spectrum；
The time-domain position in each moving distance where signal pulse maximum value is extracted, to vertical travel distance and pulse
Maximum value time-domain position carries out straight line fitting using least square method；
Pitch angle deviation θ of the pitch angle relative to 0 degree of position is calculated according to straight slope reverse simulation；
θ=arctan (k 'θ×c)；
Wherein, k 'θIt is the slope of fitting a straight line, c is the vacuum light speed as unit of mm, so that k 'θThe dimension of × c becomes
It is 1.
The method of pitch angle deviation between the mobile vertical translation platform measurement plate calibration body and thz beam
In, before mobile vertical translation platform, first coarse adjustment pitching platform passes plate calibration body surface under visual situation close to light beam
It is orthogonal to broadcast direction.
The present invention determines parameter by the mobile target of translation stage to calibrate plate calibration body and thz beam angle,
Prover time is saved, and without large-scale measuring instrument, reduces calibration cost.
Detailed description of the invention
Fig. 1 is the structural representation of the device of a kind of calibration plate calibration body provided by the invention and thz beam angle
Figure.
Fig. 2 is the azimuth schematic diagram between incident terahertz wave beam and plate calibration body.
Fig. 3 is the angle of pitch schematic diagram between incident terahertz wave beam and plate calibration body.
Fig. 4 is the reflected terahertz hereby time-domain signal spectrogram of target in each moving distance.
Fig. 5 is the fitting a straight line of moving distance and pulse maximum time-domain position.
Specific embodiment
Below according to FIG. 1 to FIG. 5, presently preferred embodiments of the present invention is illustrated.
As shown in Figure 1, the present invention provides a kind of device for calibrating plate calibration body and thz beam angle, include:
Metal pylon pedestal, it includes horizontal translation platform 5 and vertical translation platform 6, horizontal translation platform 5 is fixed for measuring plate
Azimuth angle deviation between standard type and thz beam, vertical translation platform 6 for measure plate calibration body and thz beam it
Between pitch angle deviation；
Turntable 4 is arranged on Metal pylon pedestal, for compensating the orientation between plate calibration body and thz beam
Angular displacement；
Pitching platform 3 is arranged on Metal pylon pedestal, and plate calibration body 1 is arranged in pitching platform 3 or is turned by bracket 2
On platform 4, which is used to compensate the pitch angle deviation between plate calibration body and thz beam.
In the present embodiment, pitching platform 3 is arranged on turntable 4, in other embodiments, the position of turntable 4 and pitching platform 3
It can exchange.
Plane wave light beam is irradiated to 1 surface of plate calibration body, and in the present embodiment, calibration body is selected as metal rectangular plate,
Typically optional metal plate is duralumin material, and length 2a and width 2b are 50mm, with a thickness of 3mm.
As shown in Fig. 2, the long side and broadside of rectangular plate calibration body be respectively along the direction x and y, side length is respectively 2a and 2b,
Direction of beam propagation (dotted line) is located in xz plane, and light beam and z-axis angle are azimuth
When incident beam wave vector is in x-z-plane, metal plate RCS that the physical optics solution of plate RCS provides are as follows:
In formula, azimuthFor incident light and z-axis angle (being equal to and y-z plane angle), a, b are respectively metal plate level
With the half of vertical size；
It can be seen that working as azimuthWhen being 0, i.e., when direction of beam propagation is orthogonal with plate calibration body surface, σ numerical value is most
Greatly 64a2b2/λ2。
As shown in figure 3, the long side and broadside of rectangular plate calibration body be respectively along the direction x and y, side length is respectively 2a and 2b,
Direction of beam propagation (dotted line) is located in yz plane, and light beam and z-axis angle are pitching angle theta.
When incident beam wave vector is in y-z plane, metal plate RCS that the physical optics solution of plate RCS provides are as follows:
In formula, pitching angle theta is incident light and z-axis angle (being equal to and x-z-plane angle)；
It can be seen that when that is, direction of beam propagation is orthogonal with plate calibration body surface, σ numerical value is maximum when pitching angle theta is 0
For 64a2b2/λ2。
The present invention also provides a kind of methods for calibrating plate calibration body and thz beam angle, are calibrated using calibration plate
Plate calibration body is all calibrated to the azimuth of thz beam and pitch angle orthogonal by the device of body and thz beam angle
Posture, in this posture, calibration body can measure the maximum value of RCS, to be conducive in succeeding target terahertz wave band rcs measurement
Relative Calibration.
The calibration plate calibration body and the method for thz beam angle comprise the steps of:
Step S1, plate calibration body is placed on the device of calibration plate calibration body and thz beam angle；
Step S2, the azimuth angle deviation between mobile and horizontal translation stage measurement plate calibration body and thz beam, it is mobile
Vertical translation platform measures the pitch angle deviation between plate calibration body and thz beam；
Step S3, using turntable compensate azimuth angle deviation, using pitching platform compensate pitch angle deviation, by plate calibration body with
The angle calibration system of thz beam is orthogonal posture.
The method of azimuth angle deviation between the mobile and horizontal translation stage measurement plate calibration body and thz beam
It comprises the steps of:
Coarse adjustment turntable makes plate calibration body surface under visual situation close to orthogonal with direction of beam propagation；
By constant spacing (in the present embodiment, 2.5mm can be set as) mobile and horizontal translation stage and record each moving distance
The reflected terahertz of upper target hereby time-domain signal spectrum；
The time-domain position in each moving distance where signal pulse maximum value is extracted, to moving horizontally away from discrete pulses
Maximum value time-domain position carries out straight line fitting using least square method；
Azimuth angle deviation of the azimuth relative to 0 degree of position is calculated according to straight slope reverse simulation
Wherein,It is the slope of fitting a straight line, c is the vacuum light speed as unit of mm, so thatDimension become
It is 1.
The method of pitch angle deviation between the mobile vertical translation platform measurement plate calibration body and thz beam
It comprises the steps of:
Coarse adjustment pitching platform makes plate calibration body surface under visual situation close to orthogonal with direction of beam propagation；
By constant spacing (in the present embodiment, 2.5mm can be set as) mobile vertical translation platform and record each moving distance
The reflected terahertz of upper target hereby time-domain signal spectrum；
The time-domain position in each moving distance where signal pulse maximum value is extracted, to vertical travel distance and pulse
Maximum value time-domain position carries out straight line fitting using least square method；
Pitch angle deviation θ of the pitch angle relative to 0 degree of position is calculated according to straight slope reverse simulation；
θ=arctan (k 'θ×c)；
Wherein, k 'θIt is the slope of fitting a straight line, c is the vacuum light speed as unit of mm, so that k 'θThe dimension of × c becomes
It is 1.
In the present embodiment, by taking correct azimuth angle as an example, for judge current flat panel calibration body azimuth whether
Position, can be calibrated by following steps:
As shown in figure 4, for the metal plate calibration body of side length 50mm × 50mm, using horizontal translation platform with 2.5mm's
Spacing is mobile, and the THz wave time-domain signal of reflection is recorded on different translation positions.As shown in figure 5, successively extracting each survey
The corresponding time-domain position of signal pulse maximum value is measured, and carries out straight line fitting using least square method, fitting obtains the oblique of straight line
Rate k '=0.1344 (ps/mm), by Derive offset of the azimuth relative to 0 degree of positionWherein c is
Vacuum light speed as unit of mm, so that the dimension of k ' * c becomes 1, bringing correlation values into can be calculated
By by turntable rotation and offsetIdentical angle compensates, can be by the targeted attitude of plate calibration body at azimuth
On be calibrated to it is orthogonal with thz beam direction.
For pitch angle calibration adjustment, other than being to move at a certain distance in vertical direction, method with adjustment
Azimuth is identical.
The present invention determines parameter by the mobile target of translation stage to calibrate plate calibration body and thz beam angle,
Prover time is saved, and without large-scale measuring instrument, reduces calibration cost.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (2)
1. it is a kind of calibration plate calibration body and thz beam angle device, characterized by comprising:
Metal pylon pedestal, it includes horizontal translation platform (5) and vertical translation platform (6), horizontal translation platform (5) is for measuring plate
Azimuth angle deviation between calibration body and thz beam, vertical translation platform (6) is for measuring plate calibration body and terahertz light
Pitch angle deviation between beam；
Turntable (4) is arranged on Metal pylon pedestal, for compensating the azimuth between plate calibration body and thz beam
Deviation；
Pitching platform (3) is arranged on Metal pylon pedestal, and plate calibration body (1) is arranged by bracket (2) in pitching platform (3)
Or on turntable (4), which is used to compensate the pitch angle deviation between plate calibration body and thz beam.
2. a kind of calibrate plate using the device of calibration plate calibration body as described in claim 1 and thz beam angle
The method of calibration body and thz beam angle, which is characterized in that comprise the steps of:
Plate calibration body is placed on the device of calibration plate calibration body and thz beam angle；
Mobile and horizontal translation stage measures the azimuth angle deviation between plate calibration body and thz beam, and mobile vertical translation platform is surveyed
Measure the pitch angle deviation between plate calibration body and thz beam；
Azimuth angle deviation is compensated using turntable, pitch angle deviation is compensated using pitching platform, by plate calibration body and thz beam
Angle calibration system be orthogonal posture；
The method of azimuth angle deviation between the described mobile and horizontal translation stage measurement plate calibration body and thz beam includes
Following steps:
By constant spacing mobile and horizontal translation stage and record the reflected terahertz of target in each moving distance hereby time-domain signal light
Spectrum；
The time-domain position in each moving distance where signal pulse maximum value is extracted, it is maximum away from discrete pulses to moving horizontally
It is worth time-domain position and carries out straight line fitting using least square method；
Azimuth angle deviation of the azimuth relative to 0 degree of position is calculated according to straight slope reverse simulation
Wherein,It is the slope of fitting a straight line, c is the vacuum light speed as unit of mm, so thatDimension become 1；
In the method for azimuth angle deviation between the mobile and horizontal translation stage measurement plate calibration body and thz beam,
Before mobile and horizontal translation stage, first coarse adjustment turntable makes plate calibration body surface close and direction of beam propagation under visual situation
It is orthogonal；
The method of pitch angle deviation between the described mobile vertical translation platform measurement plate calibration body and thz beam includes
Following steps:
By the mobile vertical translation platform of constant spacing and record the reflected terahertz of target in each moving distance hereby time-domain signal light
Spectrum；
The time-domain position in each moving distance where signal pulse maximum value is extracted, it is maximum to vertical travel distance and pulse
It is worth time-domain position and carries out straight line fitting using least square method；
Pitch angle deviation θ of the pitch angle relative to 0 degree of position is calculated according to straight slope reverse simulation；
θ=arctan (k 'θ×c)；
Wherein, k 'θIt is the slope of fitting a straight line, c is the vacuum light speed as unit of mm, so that k 'θThe dimension of × c becomes 1；
In the method for pitch angle deviation between the mobile vertical translation platform measurement plate calibration body and thz beam,
Before moving vertical translation platform, first coarse adjustment pitching platform approaches plate calibration body surface and beam propagation side under visual situation
To orthogonal.
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| CN109029718B (en) * | 2018-06-08 | 2020-05-19 | 西安应用光学研究所 | Terahertz source divergence angle measuring device with self-calibration function and measuring method |
| CN109444092B (en) * | 2018-09-14 | 2021-07-20 | 上海无线电设备研究所 | Test system and method for identifying oil product types by combining terahertz and laser |
| CN109031255A (en) * | 2018-09-30 | 2018-12-18 | 清华大学 | The experimental provision of Terahertz radar scattering imaging |
| WO2020177077A1 (en) * | 2019-03-05 | 2020-09-10 | 深圳市大疆创新科技有限公司 | Calibration board, depth parameter calibration method, detection apparatus and calibration system |
| CN111878677B (en) * | 2020-07-31 | 2022-04-01 | 北京环境特性研究所 | Target accurate positioning device of terahertz time-domain spectrum scattering characteristic measurement system |
| CN112731314B (en) * | 2020-12-21 | 2024-03-19 | 北京仿真中心 | Vehicle-mounted radar and visible light combined detection simulation device |
| CN113640755A (en) * | 2021-05-24 | 2021-11-12 | 中国南方电网有限责任公司超高压输电公司广州局 | Target pitch angle acquisition method and device based on radar photoelectric linkage system |
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| CN103674898A (en) * | 2013-12-13 | 2014-03-26 | 中国电子科技集团公司第四十一研究所 | Laser-ranging-based automatic reflectivity testing calibrating method |
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| CN102998665A (en) * | 2012-11-23 | 2013-03-27 | 北京航空航天大学 | Target radar cross section measuring and calibrating processing method |
| CN203204148U (en) * | 2013-01-30 | 2013-09-18 | 杨洋 | Test apparatus for target scattering characteristic of terahertz |
| CN103674898A (en) * | 2013-12-13 | 2014-03-26 | 中国电子科技集团公司第四十一研究所 | Laser-ranging-based automatic reflectivity testing calibrating method |
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