CN106199188B - A kind of device and method using removal cable phase change in circulator calibration vector field measurement - Google Patents
A kind of device and method using removal cable phase change in circulator calibration vector field measurement Download PDFInfo
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- CN106199188B CN106199188B CN201610578379.3A CN201610578379A CN106199188B CN 106199188 B CN106199188 B CN 106199188B CN 201610578379 A CN201610578379 A CN 201610578379A CN 106199188 B CN106199188 B CN 106199188B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
Abstract
A kind of device using removal cable phase change in circulator calibration vector field measurement, including radio frequency frequency synthesizer and local oscillator frequency synthesizer；Radio frequency frequency synthesizer is connected with the first directional coupler, and the straight-through end of the first directional coupler is connected with removal cable, and coupled end is connected with parametric mixer；Removal cable is connected to the port one of circulator, the port two-way of circulator crosses amplifier and is connected to the second directional coupler, the straight-through end of second directional coupler is connected with radio frequency frequency multiplier, and coupled end is connected with the port three of circulator, and radio frequency frequency multiplier is connected to receiver；The medium frequency output end of parametric mixer is connected to capture card；Local oscillator frequency synthesizer is respectively connected to local oscillator frequency multiplier and parametric mixer by power splitter, and local oscillator frequency multiplier is connected to receiver；Receiver is connected to capture card by IF process module.The present invention improves the signal-to-noise ratio of reflection signal, solves the problems, such as that reflection signal is too small when removal cable is too long and can not detect.
Description
Technical field
The invention belongs to Terahertz field of measuring technique, and in particular to one kind is for Terahertz frequency range (containing millimeter wave, sub- milli
Meter wave band) the device and method using removal cable phase change in circulator calibration vector field measurement.
Background technique
Vector field measurement refers to while measuring the amplitude and phase distribution of electromagnetic field.The measuring technique is flat by scanning one
The two-dimensional vector field shape of face, cylinder or spherical surface measures, and can derive radiation source to be measured in the 3 D electromagnetic field of full extent of space
Distribution and its propagation characteristic, therefore it is widely used in large-scale reflector antenna, Feed Horn, millimeter wave imaging system and standard
The measurement of the performances such as optical system.
Typical Terahertz plane vector field measurement system is as shown in Figure 1, wherein terahertz sources source is mounted on high-precision
On XY motorized precision translation stage, terahertz signal is generated by microwave signal frequency multiplication.In measurement process, motorized precision translation stage is put down in selected
It is scanned on face, and then obtains vector field information to be measured.The removal cable for being connected to terahertz signal source can be with translation stage one
Movement is played, since the phase of removal cable can change with the variation of the shape of cable, the mobile of cable can be in Microwave Frequency
Section introduces certain phase error.In microwave frequency band, this error be can be ignored, but in terahertz wave band, this phase
Position error is amplified with the frequency multiplication of signal.A small shake on the signal phase of 10GHz, will amplify on 1THz
100 times.The phase error that removal cable introduces can be varied with the difference of signal frequency multiplication number.In addition, the phase becomes
Change also with the area of scanning in relation to: the area of scanning is bigger, and the phase error of introducing is bigger.Therefore, the movement of removal cable
The phase error of introducing will serious vector field phase accuracy.
In order to effectively reduce influence caused by the above problem, it is necessary to which phase error caused by mobile to removal cable carries out school
It is quasi-.A kind of method of simplicity is to increase an artificial impedance mismatching in terahertz sources source, and incident microwave signal is made to have one
Fixed reflection makes this reflection signal return along same root cable reflection, is surveyed by detecting the phase of this reflection signal
Measure the phase error of the mobile introducing of the removal cable.But when the length of cable is long, due to the loss of cable itself,
The intensity of reflection signal is too small and can not accurately obtain its phase, introduces bigger phase error instead.If can be by this signal
Amplify before being reflected back removal cable, then signal is injected into removal cable, the letter of reflection signal can be effectively improved in this way
It makes an uproar and compares, and then calibrate removal cable and introduce phase error.
Summary of the invention
It is of the invention aiming at the shortcomings in the prior art, provide and a kind of utilize electricity mobile in circulator calibration vector field measurement
The device and method of cable phase change.
To achieve the above object, the invention adopts the following technical scheme:
A kind of device using removal cable phase change in circulator calibration vector field measurement, it is characterised in that: including
Radio frequency frequency synthesizer and local oscillator frequency synthesizer；Radio frequency frequency synthesizer is connected with the first directional coupler, the straight-through end of the first directional coupler and mobile electricity
Cable is connected, and coupled end is connected with parametric mixer；Removal cable is connected to the port one of circulator, and the port two of circulator passes through
Amplifier is connected to the second directional coupler, and the straight-through end of the second directional coupler is connected with radio frequency frequency multiplier, coupled end and ring
The port three of shape device is connected, and radio frequency frequency multiplier is connected to receiver；The medium frequency output end of parametric mixer is connected to capture card；This
Frequency synthesizer of shaking is respectively connected to local oscillator frequency multiplier and parametric mixer by power splitter, and local oscillator frequency multiplier is connected to receiver；It receives
Machine is connected to capture card by IF process module.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
First directional coupler is dual directional coupler, and the parametric mixer includes parametric mixer one and reference
Two coupled ends of frequency mixer two, the first directional coupler are connected with parametric mixer one and parametric mixer two respectively.
The medium frequency output end of the parametric mixer one is connected to capture card, the medium frequency output end of the parametric mixer two
It is connected by duplexer with capture card.
The power splitter includes the first power splitter and the second power splitter, and local oscillator frequency synthesizer is divided into two-way by the first power splitter,
Be connected to local oscillator frequency multiplier all the way, another way is divided into two-way by the second power splitter again, respectively with parametric mixer one and refer to
Frequency mixer two is connected.
The capture card is high-speed a/d capture card.
The receiver includes HEB frequency mixer.
The coefficient of coup of second directional coupler is suitable with the amplification factor of amplifier.
Furthermore, it is also proposed that a kind of to utilize removal cable phase change in circulator calibration vector field measurement using above-mentioned
The calibration method of device:
Radio frequency frequency synthesizer generates frequency microwave signal, and local oscillator frequency synthesizer generates local oscillator microwave signal, frequency microwave signal and local oscillator
For microwave signal respectively after M frequency multiplication, received machine generates intermediate-freuqncy signal, and wherein M is the frequency multiplication number of terahertz signal；
Frequency microwave signal is flowed by removal cable from the port of circulator one, by amplifier and the second directional couple
Device is flowed through the port three of circulator by the coupled end of the second directional coupler, is re-introduced into removal cable, by parametric mixer two
It receives；
One output system reference signal of parametric mixer, two output mobile of parametric mixer reflect signal；
Intermediate-freuqncy signal and mobile reflection signal are acquired by capture card together using duplexer, capture card also acquisition system is joined
Examine signal；
Phase information is obtained according to the collected signal of capture card, calculates and calibrates the introduced phase of removal cable and miss
Difference.
Also, further:
Radio frequency frequency synthesizer and the initial phase of local oscillator frequency synthesizer signal are respectivelyAndThe phase of system reference signal are as follows:
The phase that radiofrequency signal changes after removal cable isInto the radiofrequency signal phase of parametric mixer two are as follows:
The phase of two intermediate frequency of parametric mixer output are as follows:
Therefore the phase that the radiofrequency signal detected changes after removal cable are as follows:
The intermediate frequency phase detected is fIF, then calibrate after intermediate frequency phase are as follows:
The beneficial effects of the present invention are: connect a circulator in removal cable end, using three port identities of circulator,
Realize first will reflection signal amplification, then by signal reflex.The device and method is realized simply, and reflection signal can be effectively improved
Signal-to-noise ratio, solving the problems, such as that cable is too long causes reflection signal too small, can be applied in large-scale vector field measuring system.
Detailed description of the invention
Fig. 1 is the system block diagram of general vector fields.
Fig. 2 is vector field measuring system of the present invention and removal cable phase alignment block diagram.
Fig. 3 is the block diagram of the specific embodiment of the invention.
Appended drawing reference is as follows: radio frequency frequency synthesizer 1, local oscillator frequency synthesizer 2, the first directional coupler 3, removal cable 4, parametric mixer
One 5, parametric mixer 26, circulator 7, amplifier 8, the second directional coupler 9, radio frequency frequency multiplier 10, receiver 11, acquisition
Card 12, local oscillator frequency multiplier 13, IF process module 14, duplexer 15, the first power splitter 16, the second power splitter 17, with reference to mixing
Device 18.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.
As shown in Fig. 2, including radio frequency frequency using the device of removal cable phase change in circulator calibration vector field measurement
Comprehensive 1 and local oscillator frequency synthesizer 2, radio frequency frequency synthesizer 1 be connected with the first directional coupler 3, the first directional coupler 3 be dual directional coupler,
Straight-through end is connected with removal cable 4, and two coupled ends are connected with parametric mixer 1 and parametric mixer 26 respectively.
Removal cable 4 is connected to the port one of circulator 7, and the port two of circulator 7 is connected to amplifier 8, amplifier 8
Output end is connected with the second directional coupler 9, and the coefficient of coup is suitable with the amplification factor of amplifier 8.Second directional coupler 9
Straight-through end be connected with radio frequency frequency multiplier 10, coupled end is connected with the port three of circulator 7.Radio frequency frequency multiplier 10 is sequentially connected to
Radiation source to be measured and the receiver 11 that can be received radiofrequency signal and be mixed, receiver 11 pass sequentially through 14 He of IF process module
Duplexer 15 is connected to capture card 12, and high-speed a/d capture card can be used in capture card 12.
The medium frequency output end of parametric mixer 1 is connected to capture card 12, and the medium frequency output end of parametric mixer 26 passes through
Duplexer 15 is connected with capture card 12.Local oscillator frequency synthesizer 2 is divided by the first power splitter 16 for two-way, is connected to local oscillator frequency multiplier all the way
13, another way is divided into two-way again by the second power splitter 17, is connected respectively with parametric mixer 1 and parametric mixer 26.
When being measured using apparatus above, radio frequency frequency synthesizer 1 generates frequency microwave signal, and local oscillator frequency synthesizer 2 generates local oscillator
Respectively after M frequency multiplication, received machine 11 generates intermediate-freuqncy signal for microwave signal, frequency microwave signal and local oscillator microwave signal,
Wherein M is the frequency multiplication number of terahertz signal.
Frequency microwave signal is flowed by removal cable 4 from the port of circulator 7 one, is oriented by amplifier 8 and second
Coupler 9 is flowed through the port three of circulator 7 by the coupled end of the second directional coupler 9, removal cable 4 is re-introduced into, by referring to
Frequency mixer 26 receives.One 5 output system reference signal of parametric mixer, 26 output mobile of parametric mixer reflect signal；Benefit
Intermediate-freuqncy signal and mobile reflection signal are acquired by capture card 12 together with duplexer 15, the also acquisition system of capture card 12 is with reference to letter
Number.
The collected signal of capture card 12 is that time-domain signal obtains the phase information of each signal after FFT transform.System
Phase analysis of uniting is as follows: the devices such as circulator, directional coupler and power splitter are fixed, when radiofrequency signal passes through these devices
When, it only will increase a fixed phase, the phase that system finally detects do not influenced, is not considered here.
Assuming that radio frequency frequency synthesizer and the initial phase of local oscillator frequency synthesizer signal areAndThe phase of system reference signal are as follows:
Assuming that the phase that radiofrequency signal changes after removal cable 4 isRadio frequency into parametric mixer 26 is believed
Number phase are as follows:
Wherein coefficient 2 is the phase exported by 26 intermediate frequency of parametric mixer because signal passes through removal cable 4 twice are as follows:
Therefore the phase that the radiofrequency signal detected changes after removal cable 4 are as follows:
Assuming that the intermediate frequency phase detected is fIF, then calibrate after intermediate frequency phase are as follows:
Thus the phase error of the introducing of removal cable 4 is detected, and in final test result alignment.
It is that the device is applied to 495GHz vector field measuring system, wherein radio frequency frequency synthesizer and local oscillator frequency synthesizer as shown in Figure 3
Frequency be respectively that the microwave signal of 13.75GHz and 13.76GHz obtains the Terahertz of 495GHz respectively after 36 frequencys multiplication
The Terahertz local oscillation signal of radiofrequency signal and 495.36GHz generates the intermediate-freuqncy signal of 360MHz after the mixing of HEB frequency mixer.System
10MHz reference signal of uniting is generated by parametric mixer 1, and frequency microwave signal is after the reflection of removal cable 4 by parametric mixer
26 receive.The output signal of parametric mixer 26 is through duplexer 15 by the channel of capture card 12 together with 360MHz intermediate-freuqncy signal
One acquisition, capture card 12 specifically use NI5772R dual channel high speed A/D capture card.Collected capture card 12 is time-domain signal,
After FFT transform, the phase of 360MHz intermediate-freuqncy signal, system 10MHz reference signal and mobile reflection signal can be respectively obtained
Position, can obtain removal cable phase change by data processing and calibrate.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (9)
1. a kind of device using removal cable phase change in circulator calibration vector field measurement, it is characterised in that: including penetrating
Frequent comprehensive (1) and local oscillator frequency synthesizer (2)；Radio frequency frequency synthesizer (1) is connected with the first directional coupler (3), and the first directional coupler (3) is straight
Go side is connected with removal cable (4), and coupled end is connected with parametric mixer；Removal cable (4) is connected to the port of circulator (7)
One, the port two-way of circulator (7) is crossed amplifier (8) and is connected to the second directional coupler (9), the second directional coupler (9)
Straight-through end is connected with radio frequency frequency multiplier (10), and coupled end is connected with the port three of circulator (7), and radio frequency frequency multiplier (10) is connected to
Receiver (11)；The medium frequency output end of parametric mixer is connected to capture card (12)；Local oscillator frequency synthesizer (2) is connected respectively by power splitter
It is connected to local oscillator frequency multiplier (13) and parametric mixer, local oscillator frequency multiplier (13) is connected to receiver (11)；Receiver (11) passes through
IF process module (14) is connected to capture card (12).
2. special as described in claim 1 using the device of removal cable phase change in circulator calibration vector field measurement
Sign is: first directional coupler (3) is dual directional coupler, and the parametric mixer includes parametric mixer one (5)
With parametric mixer two (6), two coupled ends of the first directional coupler (3) are respectively with parametric mixer one (5) and with reference to mixed
Frequency device two (6) is connected.
3. special as claimed in claim 2 using the device of removal cable phase change in circulator calibration vector field measurement
Sign is: the medium frequency output end of the parametric mixer one (5) is connected to capture card (12), the parametric mixer two (6)
Medium frequency output end is connected by duplexer (15) with capture card (12).
4. special as claimed in claim 3 using the device of removal cable phase change in circulator calibration vector field measurement
Sign is: the power splitter includes the first power splitter (16) and the second power splitter (17), and local oscillator frequency synthesizer (2) passes through the first power splitter
(16) it is divided into two-way, is connected to all the way local oscillator frequency multiplier (13), another way is divided into two-way by the second power splitter (17) again, respectively
It is connected with parametric mixer one (5) and parametric mixer two (6).
5. special as claimed in claim 4 using the device of removal cable phase change in circulator calibration vector field measurement
Sign is: the capture card (12) is high-speed a/d capture card.
6. special as claimed in claim 4 using the device of removal cable phase change in circulator calibration vector field measurement
Sign is: the receiver (11) includes HEB frequency mixer.
7. special as claimed in claim 4 using the device of removal cable phase change in circulator calibration vector field measurement
Sign is: the coefficient of coup of second directional coupler (9) is suitable with the amplification factor of amplifier (8).
8. a kind of utilize removal cable phase in circulator calibration vector field measurement using as described in any one of claim 4-7
The calibration method of the device of position variation characterized by comprising
Radio frequency frequency synthesizer (1) generates frequency microwave signal, and local oscillator frequency synthesizer (2) generates local oscillator microwave signal, frequency microwave signal and sheet
For microwave signal of shaking respectively after M frequency multiplication, received machine (11) generates intermediate-freuqncy signal, and wherein M is the frequency multiplication of terahertz signal
Number；
Frequency microwave signal is flowed by removal cable (4) from the port one of circulator (7), fixed by amplifier (8) and second
To coupler (9), the port three of circulator (7) is flowed through by the coupled end of the second directional coupler (9), is re-introduced into removal cable
(4), it is received by parametric mixer two (6)；
Parametric mixer one (5) output system reference signal, parametric mixer two (6) output mobile reflect signal；
Intermediate-freuqncy signal and mobile reflection signal are acquired by capture card (12) together using duplexer (15), capture card (12) is also adopted
Collecting system reference signal；
Phase information is obtained according to capture card (12) collected signal, calculate and calibrates the introduced phase of removal cable (4)
Error.
9. utilizing the calibration of the device of removal cable phase change in circulator calibration vector field measurement as claimed in claim 8
Method, it is characterised in that:
Radio frequency frequency synthesizer (1) and the initial phase of local oscillator frequency synthesizer (2) signal are respectivelyAndThe phase of system reference signal are as follows:
The phase that radiofrequency signal changes after removal cable (4) isInto the radiofrequency signal phase of parametric mixer two (6)
Are as follows:
The phase of parametric mixer two (6) intermediate frequency output are as follows:
Therefore the phase that the radiofrequency signal detected changes after removal cable (4) are as follows:
The intermediate frequency phase detected is fIF, then calibrate after intermediate frequency phase are as follows:
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| CN108427114B (en) * | 2018-01-24 | 2023-06-02 | 吉林大学 | Loss-compensated frequency division multiplexing millimeter wave three-dimensional imaging device and method |
| CN108614162B (en) * | 2018-05-02 | 2020-06-09 | 上海交通大学 | Microwave photon vector network analysis device and method for measuring scattering parameters of microwave device |
| US20220029645A1 (en) * | 2018-11-29 | 2022-01-27 | Teknologian Tutkimuskeskus Vtt Oy | Antenna assembly for wireless communication devices |
| CN109633578B (en) * | 2018-12-03 | 2020-09-08 | 上海无线电设备研究所 | Two-channel high-precision phase calibration system and method |
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