CN103884922B - Measuring device and method for Terahertz vector field shape of single receiver - Google Patents
Measuring device and method for Terahertz vector field shape of single receiver Download PDFInfo
- Publication number
- CN103884922B CN103884922B CN201410114485.7A CN201410114485A CN103884922B CN 103884922 B CN103884922 B CN 103884922B CN 201410114485 A CN201410114485 A CN 201410114485A CN 103884922 B CN103884922 B CN 103884922B
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- channel
- receiver
- field shape
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 238000001228 spectrum Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 2
- 230000002285 radioactive effect Effects 0.000 abstract 1
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Abstract
The invention discloses a measuring device and method for the Terahertz vector field shape of a single receiver, and relates to the technical field of Terahertz measurement. The measuring device comprises two signal channels, namely the testing channel and the reference channel. In the testing channel, an emission frequency synthesizer is connected with a frequency doubling amplifying module, a radioactive source to be measured and a receiver in sequence through a directional coupler, wherein the receiver can receive radio frequency signals and perform frequency mixing. In the reference channel, the emission frequency synthesizer and a local-oscillation frequency synthesizer are respectively connected with a microwave mixer through the other output port of the directional coupler. The intermediate frequency output port of the receiver and the intermediate frequency output port of the microwave mixer are respectively connected with a dual-channel A/D acquisition card. The measuring device and method have the advantages that measurement of the Terahertz vector field shape can be completed, the phase measurement accuracy of the measuring device is equivalent to that of the scheme containing double receivers, building cost is low, and system configuration is more flexible.
Description
Technical field
The present invention relates to the technical field that Terahertz is measured, particularly relate to measure Terahertz frequency range (containing millimeter wave, submillimeter
Wave-wave section) device and method of vector field shape, specifically, be a kind of single-receiver Terahertz vector field shape measurement apparatus and
Measuring method.
Background technology
Vector field shape measurement refers to measure amplitude and the PHASE DISTRIBUTION of electromagnetic field simultaneously.By two on a certain fixed pan
N dimensional vector n field shape is measured, can the derive radiation source to be measured three dimensional field distribution in full extent of space and propagation characteristic thereof, therefore
This measuring method is in the fields such as reflector antenna, Feed Horn, microwave and millimeter wave imaging system and collimator optical system
Important measurement means.In order to obtain the PHASE DISTRIBUTION of field to be measured, need to provide a road phase reference signal for measurement signal, should
Signal does not changes with the change of spacescan position, and be used merely to characterize agitator in transmitter and receiver produces with
Machine phase fluctuation.In the phase place measuring signal, deduct the fluctuation of this part random phase, i.e. can get the real phase place in field to be measured
Distributed intelligence.In traditional microwave and millimeter wave vector field shape measurement system, measure signal and reference signal respectively by two
Receiver provides (as shown in Figure 1), and wherein receiver receives the signal of measurement field, and another receiver is by fixed
Directly it is connected with transmitter to bonder.Two receivers share same local vibration source, it is achieved phase place is correlated with.In the higher Asia of frequency
Millimeter wave and Terahertz frequency range, principle still can use said system constitute, but at these frequency ranges, the output one of transmitter
As relatively low, receiver relatively costly, and significantly raising for the relatively low frequency range of noise temperature, usually can not meet vector field shape
Sensitivity needed for measurement and dynamic range requirement.Use high sensitivity superconducting receivers can obtain lower than quasiconductor receiver
Noise temperature more than one magnitude, it is achieved high-precision field shape is measured, but its shortcoming to be volume and power consumption relatively big, cost is held high
Expensive.
Summary of the invention
The technical problem to be solved is for the above-mentioned state of the art, and provides a kind of and only use a receiver
The measurement of Terahertz vector field shape and phase measurement accuracy can be completed with double-receiver scheme is suitable, construction cost is cheap, system
Configuration single-receiver Terahertz vector field shape measurement apparatus and measuring method thereof more flexibly.
The present invention solves the technical scheme that above-mentioned technical problem used:
Single-receiver Terahertz vector field shape measurement apparatus, including launching that frequency is combined, local oscillator frequency is combined, TCH test channel and with reference to logical
Road, in TCH test channel, transmitting frequency is combined and is connected with frequency multiplication amplification module, radiation source to be measured and energy in turn by directional coupler
Receive radiofrequency signal the receiver being mixed；In reference channel, launch the most comprehensive and local oscillator frequency is comprehensive all another by directional coupler
One output port is connected with microwave mixer.The medium frequency output end mouth of receiver and microwave mixer is all connected with capture card.
For optimizing technique scheme, the concrete measure taked also includes:
Above-mentioned capture card is double channel A/D capture card.
Above-mentioned directional coupler includes the first directional coupler and the second directional coupler, launches frequency comprehensive fixed with first
Connecting to bonder, local oscillator frequency is combined and is connected with the second directional coupler, and the first directional coupler and the second directional coupler all wrap
Include two output ports, and the two port has been respectively communicated with TCH test channel and reference channel.
Above-mentioned transmitting frequency is combined, local oscillator frequency is combined and is connected with each other by 10MHz reference signal line between capture card.
The above-mentioned method measuring Terahertz vector field shape by single-receiver Terahertz vector field shape measurement apparatus, including
Following steps:
Step one, transmitting frequency are combined to combine with local oscillator frequency and are connected with a directional coupler respectively, and two of directional coupler defeated
Go out passage to combine the microwave signal frequency sent be designated as respectively as test and reference channel, transmitting frequency, local oscillator frequency is combined and is sent
Microwave signal frequency is designated as；
Step 2, in Measurement channel, launch frequency combine output microwave signal through frequency multiplication amplify after, generate Terahertz radio frequency
Signal, after the machine of being received receives and is mixed, generates test intermediate-freuqncy signal, and its frequency is=m(-), wherein m is for surveying
The total frequency multiplication number of times pinged；
Step 3, in reference channel, launch frequency and combine and local oscillator frequency is combined the signal of output and sent in microwave mixer, generate
With reference to intermediate-freuqncy signal, its frequency is=-；
Step 4, general's test intermediate-freuqncy signal and reference intermediate-freuqncy signal are sent in capture card, and the two is entered by described capture card
Row A/D samples, and obtains the time-domain digital signal of TCH test channelx T (t) and the time-domain digital signal of reference channelx R (t)；
Step 5, the time-domain digital signal of TCH test channel and the time-domain digital signal of reference channel are carried out software digital letter
Number process, obtain amplitude and the phase place of TCH test channel.
The time-domain digital signal of TCH test channel and the time-domain digital signal of reference channel are carried out soft by above-mentioned step 5
The flow process of part Digital Signal Processing is:
1) the most rightx T (t) andx R (t) carry out Fourier transformation, obtain testing the frequency spectrum of intermediate frequencyX T (f) and with reference to intermediate frequency
Frequency spectrumX R (f)；
2) from test intermediate frequency spectrum, extract the amplitude of test signalAnd phase place；
3) from reference to intermediate frequency spectrum, extract the amplitude of reference signalAnd phase place；
4) calculating the phase place after test signal correction is-m()。
The sample frequency of capture card 8 in above-mentioned step 4〉。
The single-receiver Terahertz vector field shape measurement apparatus of the present invention is that vector field shape based on single receiver is measured
System, this system schema is based on high-speed a/d analog input card, and utilizes Digital Signal Processing to realize high-precision phase position reference signal,
System constitutes convenient, flexible, and phase measurement accuracy is suitable with double-receiver scheme.High-speed a/d analog input card is double channels acquisition
Board, two passages are respectively defined as passage 1 and passage 2.The transmitting frequency of the present invention is combined and local oscillator frequency combines respectively with one orientation
Bonder or power splitter are connected, and two output channels of directional coupler are respectively as test and reference channel.At Measurement channel
In, the microwave signal of the comprehensive output of transmitting frequency is after many times frequency multiplication amplifies, and generation Terahertz radiofrequency signal, the machine of being received receives and mixes
After Pin, generating test intermediate-freuqncy signal, its frequency is=m(-), in reference channel, launch frequently to combine and combine with local oscillator frequency
The signal of output is sent in a microwave mixer, generates with reference to intermediate-freuqncy signal, and its frequency is=-.Test and reference
Intermediate-freuqncy signal is respectively fed to the passage 1 of dual channel high speed A/D capture card and passage 2 carries out A/D sampling, obtains TCH test channel and ginseng
Examine the time-domain digital signal of passagex T (t) andx R (t).Two-way intermediate frequency time-domain signal is carried out software digital signal processing, finally
Extract amplitude and the phase information of TCH test channel.For avoiding aliasing, the sample frequency of high-speed a/d capture cardNeed to meet〉。
The advantage that this method constitutes scheme relative to traditional double-receiver system is: utilize single receiver just energy real
The method that existing vector field shape is measured is very advantageous in Terahertz frequency range, is possible not only to reduce system cost, improves system steady
Qualitative and reliability, also helps the system integration and miniaturization, carries out total digitalization by high-resolution high-speed a/d analog input card
IF signal processing, improve IF signal processing signal to noise ratio.This method extends also to transmitter and receiver and uses not
In measurement apparatus with frequency multiplication number of times, make system configuration more flexible.
Accompanying drawing explanation
Fig. 1 is the structural representation that in background technology, double-receiver measures Terahertz vector field shape device；
Fig. 2 is the structural representation of the present invention；
Fig. 3 is the structural representation of the 560GHz vector field shape measurement of first embodiment of the invention；
Fig. 4 is the structural representation of the 850GHz vector field shape measurement of first embodiment of the invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
Fig. 1 is the structural representation of background art device, and Fig. 2 to Fig. 4 show the structural representation of the present invention.
Reference therein is: launch that frequency combines 1, local oscillator frequency combines 2, directional coupler the 3, first directional coupler 31, the
Two directional couplers 32, frequency multiplication amplification module 4, radiation source to be measured 5, receiver 6, microwave mixer 7, capture card 8, vector voltage
Meter 9.
First embodiment:
The single-receiver Terahertz vector field shape measurement apparatus of the present invention, as in figure 2 it is shown, include launching frequency comprehensive 1 and local oscillator
Frequency combines 2, launches frequency comprehensive 1 and local oscillator frequency is combined 2 and is simultaneously connected with TCH test channel and reference channel by a directional coupler 3 respectively, and
In TCH test channel, launch frequency combine 1 by directional coupler 3 be connected with in turn frequency multiplication amplification module 4, radiation source to be measured 5 and
Radiofrequency signal the receiver 6 being mixed can be received, wherein, in reference channel, launch frequency comprehensive 1 and local oscillator frequency combines 2 all by fixed
Being connected with microwave mixer 7 to bonder 3, receiver 6 and microwave mixer 7 are all connected with capture card 8.Shown in Fig. 2
Systematic survey 560GHz vector field shape, as it is shown on figure 3, in Fig. 3 radio frequency frequency combine 1 and local oscillator frequency combine 2 respectively output 15.55GHz and
The microwave signal of 15.56GHz, after 36 frequencys multiplication, generates Terahertz radiofrequency signal and the 560.16GHz of 559.8GHz
Terahertz local oscillation signal, after the mixing of HEB frequency mixer that both are received in machine 6 filter and amplification, obtain the test of 360MHz
Intermediate-freuqncy signal.It addition, radio frequency frequency comprehensive 1 and local oscillator frequency combine the signals of 2 outputs directly by obtaining after microwave mixer 7 mixing
The reference intermediate-freuqncy signal of 10MHz.Test intermediate-freuqncy signal is simultaneously fed into NI 5772R high-speed a/d analog input card with reference to intermediate-freuqncy signal
Sampling, this capture card is double channels acquisition card, and the highest sample frequency is 800MHz, and resolution is 12bit, can realize the highest
The sampling dynamic range of 72dB.Capture card output test and the time-domain sampling signal of reference channel, then through software digital signal
Processing, finally giving the phase place after test signal correction is, whereinWithRespectively test letter
Number and the phase place of reference signal.Test result indicate that, this measurement system can realize the amplitude measurement essence of ± 1% in 560GHz frequency range
Degree and ± 1oPhase measurement accuracy.
Second embodiment:
As shown in Figure 4, in the present embodiment, transmitter and receiver uses different frequency multiplication number of times, and by shown in Fig. 2 being
Unified test amount 850GHz vector field shape.In the present embodiment, radio frequency frequency combine 1 and local oscillator frequency combine 2 respectively output 11.81GHz and
The microwave signal of 15.74GHz, after 72 frequencys multiplication and 54 frequencys multiplication, generates the Terahertz radiofrequency signal of 850.32GHz
With the Terahertz local oscillation signal of 849.96GHz, both, after the mixing of HEB frequency mixer filter and amplification, obtain the test of 360MHz
Intermediate-freuqncy signal.In reference arm, radio frequency frequency combine 1 and local oscillator frequency combine the signals of 2 outputs respectively through 4 times and 3 frequencys multiplication, obtain
The millimeter-wave signal of 47.24GHz and 47.22GHz, both obtain the reference intermediate frequency letter of 20MHz after microwave mixer 7 is mixed
Number.Test is simultaneously fed into NI 5772R high-speed a/d analog input card with reference intermediate-freuqncy signal and samples, and obtains test and leads to reference
The time-domain sampling signal in road.Finally giving the phase place after test signal correction is。
Finally illustrating, above example is only in order to illustrate technical scheme and unrestricted, although by ginseng
According to the preferred embodiments of the present invention, invention has been described, it should be appreciated by those of ordinary skill in the art that can
In the form and details it is made various change, the present invention limited without departing from appended claims
Spirit and scope.
Claims (5)
1. the method that single-receiver Terahertz vector field shape measurement apparatus measures Terahertz vector field shape, wherein, single-receiver is too
Hertz vector field shape measurement apparatus includes launching frequency comprehensive (1) and local oscillator frequency combines (2), it is characterized in that: this single-receiver Terahertz is vowed
Amount field shape measurement apparatus also includes TCH test channel and reference channel, and in TCH test channel, described transmitting frequency combines (1) by orientation
Bonder (3) is connected with frequency multiplication amplification module (4), radiation source to be measured (5) in turn and can receive radiofrequency signal connecing of being mixed
Receipts machine (6), in reference channel, launch frequency combine (1) and local oscillator frequency combine (2) all by the output port of directional coupler (3) and
Microwave mixer (7) connects, and the medium frequency output end mouth of described microwave mixer (7) and receiver (6) are all with capture card (8) even
Connect；Described directional coupler (3) includes the first directional coupler (31) and the second directional coupler (32), described first
Directional coupler (31) and the second directional coupler (32) all include two output ports, and the two port is respectively communicated with survey
Pinging and reference channel, single-receiver Terahertz vector field shape measuring method comprises the following steps:
Step one, described transmitting frequency are combined (1) and are connected with the first directional coupler (31), and described local oscillator frequency combines (2) and second
Directional coupler (32) connects, by two output ports of the first directional coupler (31) and the second directional coupler (32) respectively
Connecting test passage and reference channel, the microwave signal frequency that transmitting frequency comprehensive (1) sends is designated as fRF, local oscillator frequency comprehensive (2) sends
Microwave signal frequency is designated as fLO；
Step 2, in Measurement channel, launch frequency and combine (1) microwave signal of exporting after frequency multiplication is amplified, generate Terahertz radio frequency
Signal, is received after machine (6) receives and be mixed, generates test intermediate-freuqncy signal, and its frequency is fTEST=m (fRF-fLO), wherein m is
Total frequency multiplication number of times of TCH test channel；
Step 3, in reference channel, launch frequency and combine and local oscillator frequency is combined the signal of output and sent in microwave mixer (7), generate
With reference to intermediate-freuqncy signal, its frequency is fIF=fRF-fLO；
Step 4, general's test intermediate-freuqncy signal and reference intermediate-freuqncy signal are sent in capture card (8), and described capture card (8) is to the two
Carry out A/D sampling, obtain the time-domain digital signal x of TCH test channelTThe time-domain digital signal x of (t) and reference channelR(t)；
Step 5, the time-domain digital signal of TCH test channel and the time-domain digital signal of reference channel are carried out at software digital signal
Reason, obtains amplitude and the phase place of TCH test channel.
Single-receiver Terahertz vector field shape measurement apparatus the most according to claim 1 measures the side of Terahertz vector field shape
Method, is characterized in that: described capture card (8) is double channel A/D capture card.
Single-receiver Terahertz vector field shape measurement apparatus the most according to claim 1 and 2 measures Terahertz vector field shape
Method, it is characterized in that: described transmitting frequency combines (1), local oscillator frequency is combined and passed through 10MHz reference signal between (2) and capture card (8)
Line is connected with each other.
Single-receiver Terahertz vector field shape measurement apparatus the most according to claim 1 measures the side of Terahertz vector field shape
Method, is characterized in that: in described step 5 enter the time-domain digital signal of TCH test channel and the time-domain digital signal of reference channel
The flow process of row software digital signal processing is:
1) respectively to xT(t) and xRT () carries out Fourier transformation, obtain testing the frequency spectrum X of intermediate frequencyT(f) and the frequency spectrum with reference to intermediate frequency
XR(f)；
2) from test intermediate frequency spectrum, extract the amplitude of test signal | XT(mfIF) | and phase place ∠ XT(mfIF)；
3) from reference to intermediate frequency spectrum, extract the amplitude of reference signal | XR(fIF) | and phase place ∠ XR(fIF)；
4) calculating the phase place after test signal correction is ∠ XT(mfIF)-m(∠XR(fIF))。
Single-receiver Terahertz vector field shape measurement apparatus the most according to claim 1 measures the side of Terahertz vector field shape
Method, is characterized in that: sample frequency f of capture card (8) in described step 4S〉2fIF。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410114485.7A CN103884922B (en) | 2014-03-26 | 2014-03-26 | Measuring device and method for Terahertz vector field shape of single receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410114485.7A CN103884922B (en) | 2014-03-26 | 2014-03-26 | Measuring device and method for Terahertz vector field shape of single receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103884922A CN103884922A (en) | 2014-06-25 |
| CN103884922B true CN103884922B (en) | 2017-01-11 |
Family
ID=50953924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410114485.7A Expired - Fee Related CN103884922B (en) | 2014-03-26 | 2014-03-26 | Measuring device and method for Terahertz vector field shape of single receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103884922B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740701B (en) * | 2019-03-24 | 2024-02-09 | 天津大学青岛海洋技术研究院 | Novel cross-coupling monolithic coherent receiving and transmitting system |
| CN110224764B (en) * | 2019-06-13 | 2021-08-20 | 复旦大学 | Method for generating vector terahertz signal by using PM and IM based on ISB and multi-carrier |
| CN111398919B (en) * | 2020-03-20 | 2022-03-08 | 北京环境特性研究所 | Electromagnetic scattering test link system and method for inhibiting video leakage interference |
| CN112130006A (en) * | 2020-09-24 | 2020-12-25 | 北京邮电大学 | Antenna test method and system |
| CN115473538B (en) * | 2022-08-25 | 2023-08-04 | 中国科学院紫金山天文台 | Method and device for realizing real-time cross-correlation of high-speed multi-frequency dual-channel data |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590640A (en) * | 2012-02-21 | 2012-07-18 | 北京航空航天大学 | Millimeter-wave\submillimeter-wave near-field amplitude and phase measuring method |
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN103454542A (en) * | 2013-09-11 | 2013-12-18 | 中国电子科技集团公司第四十一研究所 | Antenna, transmission line tester and real-time automatic correction method |
| CN103596637A (en) * | 2012-08-13 | 2014-02-19 | 华为技术有限公司 | Antenna fault detection method and device |
| CN203479924U (en) * | 2013-07-24 | 2014-03-12 | 航天信息股份有限公司 | Device for detecting aging condition of equipment |
-
2014
- 2014-03-26 CN CN201410114485.7A patent/CN103884922B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN102590640A (en) * | 2012-02-21 | 2012-07-18 | 北京航空航天大学 | Millimeter-wave\submillimeter-wave near-field amplitude and phase measuring method |
| CN103596637A (en) * | 2012-08-13 | 2014-02-19 | 华为技术有限公司 | Antenna fault detection method and device |
| CN203479924U (en) * | 2013-07-24 | 2014-03-12 | 航天信息股份有限公司 | Device for detecting aging condition of equipment |
| CN103454542A (en) * | 2013-09-11 | 2013-12-18 | 中国电子科技集团公司第四十一研究所 | Antenna, transmission line tester and real-time automatic correction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103884922A (en) | 2014-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103884922B (en) | Measuring device and method for Terahertz vector field shape of single receiver | |
| CN102545935B (en) | Calibration receiving device and calibration receiving method of radio frequency simulation system | |
| CN102680826B (en) | A kind of method utilizing vector network analyzer to realize the test of embedded local oscillator frequency converter | |
| CN106353748B (en) | Signal processing apparatus and method for fmcw radar range-measurement system | |
| CN102752061B (en) | Device and method for generating reference signal of phase-locked amplifier of millimeter wave attenuation measurement system | |
| CN103595404B (en) | A kind of frequency mixer Group Delay Measurement circuit and method | |
| CN103684490A (en) | Passive intermodulation outlier quick locating method based on vector network analyzer | |
| Hesler et al. | THz vector network analyzer measurements and calibration | |
| US9720023B2 (en) | Vector network power meter | |
| CN110596657B (en) | Device for testing operation of distance measuring machine/Takang | |
| CN106443548A (en) | Calibration method of using electronic calibration piece to measure frequency conversion loss of mixer by vector network analyzer | |
| Crowe et al. | VNA frequency extenders to 1.1 THz | |
| CN106019276B (en) | A kind of mm-wave imaging device | |
| CN109541325A (en) | The spaceborne one-dimensional Synthetic Aperture Microwave radioactivity detection, identificationm, and computation of one kind and measurement method | |
| CN106199188B (en) | A kind of device and method using removal cable phase change in circulator calibration vector field measurement | |
| CN107329127A (en) | A kind of phase linearity analysis method and system for radar system DBF Function detections | |
| CN110190864A (en) | A kind of distribution local oscillator Terahertz superhet array acceptor | |
| CN109470936B (en) | KIDs detector noise test circuit and test method based on active quadrature mixer | |
| CN105024770B (en) | Quantitative testing for sensitivity of a non-coherent FMCW autodyne receiver | |
| CN108896831A (en) | The method that a kind of combination interior near field and far field carry out OTA measurement to active antenna | |
| CN210327547U (en) | Real-time frequency spectrum monitoring equipment | |
| CN209821370U (en) | Signal amplitude-comparison phase and direction finding device | |
| CN108896965B (en) | 200GHz frequency band signal receiving and transmitting measurement system | |
| CN109617633A (en) | A kind of Attenuation measuring system and method | |
| CN106771712B (en) | A kind of frequency converter phase conformance testing device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |