CN104459652B - A kind of 3mm band noises coefficient single-side belt spreads measurement apparatus and method in high precision - Google Patents
A kind of 3mm band noises coefficient single-side belt spreads measurement apparatus and method in high precision Download PDFInfo
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- CN104459652B CN104459652B CN201410734744.6A CN201410734744A CN104459652B CN 104459652 B CN104459652 B CN 104459652B CN 201410734744 A CN201410734744 A CN 201410734744A CN 104459652 B CN104459652 B CN 104459652B
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Abstract
The present invention provides a kind of 3mm band noises coefficient single-side belt spread spectrum measurement apparatus and method in high precision, wherein, the device includes：Low-converter module, microwave local oscillation synthesis module, control interface module and power module；The low-converter module is used for input matching, region filtering and the down coversion for completing 3mm signals；The microwave local oscillation synthesis module, including yig tuned oscillator (YTO) and drive control circuit, for producing scan synthesis local oscillation signal source；The control interface module, the information exchange for realizing microwave noise coefficient analysis instrument main frame and this spread spectrum measurement apparatus by USB intelligence interface buses；The power module, for providing each road power supply needed for this spread spectrum measurement apparatus.The present invention solves that the system that existing 3mm band noises coefficient testing scheme is present is huge, measurement accuracy is poor, measurement reproducibility and uniformity are difficult to ensure, purchase with maintenance cost is high, operating difficulties the problems such as.
Description
Technical field
The present invention relates to noise coefficient technical field of measurement and test, and in particular to a kind of 3mm band noises coefficient single-side belt is high-precision
Degree spread spectrum measurement apparatus and method.
Background technology
Noise coefficient is that sign receiver and its building block handle small-signal energy in the presence of having thermal noise
One of key parameter of power, the frequency spectrum resource taken with electronic equipment is to 3mm band extensions, to the high-precision noise of 3mm wave bands
The demand of coefficient test equipment is increasingly urgent.
Millimere-wave band noise-factor measurement generally uses Y factor method, and this method is solid-state noise source and highly sensitive receiver
Outstanding fusion.Solid-state noise source exports broadband white noise signal as the pattern field source of measurement, and highly sensitive receiver is used for
The power measurement of faint random noise.Because solid-state noise source exports broadband white noise signal, 3mm band noises coefficient spread spectrum is surveyed
Amount is firstly the need of filtering out image response, while requiring that Noise Factor Analyzer must possess extremely low own ship's noise coefficient and excellent
Input matching properties, therefore the high-precision noise coefficient test device technical difficulty of 3mm wave band seamless coverages is realized in integration
It is very big.
Existing 3mm band noises coefficient test desktop system scheme as shown in figure 1, by microwave noise coefficient analysis instrument,
What 3mm local oscillation signals source and 3mm wave bands fundamental mixer were constituted.Wherein fundamental mixer is using fixed Low Medium Frequency output, local oscillator
The mixing scheme of scanning, frequency range covers 75~110GHz, and the frequency range in local oscillation signal source covers 75~110GHz；Microwave
Noise Factor Analyzer controls 3mm local oscillation signals source, local oscillation signal source and radio frequency synchronization scanning by gpib bus, realizes noise
The automatic measurement of coefficient, this programme is only capable of carrying out two-sided cells measurement.
Agilent company of the U.S. is proposed the serial spread spectrum modules of K, and microwave noise coefficient analysis instrument constitutes split type expansion
Frequency test system, realizing all standing of 3mm wave bands by three down conversion modules, there is provided the measurement of 3mm wave bands single-side-band noise figure.
The scheme of K series 3mm spread spectrum modules is as shown in Figure 2.Spread spectrum module fixes local oscillator using high intermediate frequency output is scanned
Mixing scheme, surveys the frequency of 3mm input signals to microwave noise coefficient analysis instrument with internal spot-frequency local oscillation (LO) signal
Intermediate frequency (IF) signal within the scope of amount, built-in Gunn oscillator produces spot-frequency local oscillation (LO) signal.
3mm waveband Ks series spread spectrum module model, frequency range, input adapter form, local frequency and intermediate frequency output frequency
Scope collects as shown in table 1：
Table 1
The shortcoming of existing desktop system scheme：
1) it is bulky, connection is complicated, require the high-power output of local oscillation signal source full frequency band, testing cost is high；
2) noise coefficient double-side band measurement scheme is provided, measurement accuracy is poor；
3) power output in local oscillation signal source is difficult to meet the optimal of fundamental wave mixing in 75~110GHz full band ranges
Job requirement, different frequency point needs to adjust the size of local oscillation signal source power output, and measurement efficiency is low, the repeatability of measurement and
Stability is poor.
The shortcoming of K series spread spectrum module schemes：
1) three spread spectrum modules are needed to cover whole 3mm wave bands, the connection of 3mm test systems is complicated, expensive, test
It is high with maintenance cost；
2) the spot-frequency local oscillation signal source built in is exported using Gunn oscillator free oscillation, in 15~35 DEG C of range of frequencies
The degree of accuracy is ± 50MHz, and the precision and frequency resolution of noise-factor measurement are poor.
The content of the invention
To overcome the shortcoming of existing 3mm noise coefficients testing scheme, the purpose of the present invention is to release a kind of 3mm band noises
Coefficient single-side belt spread spectrum measurement apparatus and method, and a set of test system of microwave noise coefficient analysis main frame composition in high precision, it is real
Existing 75~110GHz single-side belt, high-precision noise-factor measurement, meet the growing test need of 3mm band noise coefficients
Ask.
For up to above-mentioned purpose, on the one hand, the invention provides a kind of 3mm band noises coefficient single-side belt, spread spectrum is surveyed in high precision
Device is measured, including：
Low-converter module, microwave local oscillation synthesis module, control interface module and power module；
The low-converter module is used for input matching, region filtering and the down coversion for completing 3mm signals；It is additionally operable to realize
Local oscillation signal frequency multiplication, filtering and amplification, produce the millimeter wave local oscillation signal needed for fundamental mixer；And it is defeated for completing mixing
Go out the amplification and the compensation of frequency conversion channel gain flatness of intermediate-freuqncy signal；
The microwave local oscillation synthesis module, including yig tuned oscillator (YTO) and drive control circuit, for producing conjunction
Into scanning local oscillation signal source；
The control interface module, for by USB intelligence interface buses realize microwave noise coefficient analysis instrument main frame and
The information exchange of this spread spectrum measurement apparatus；
The power module, for providing each road power supply needed for this spread spectrum measurement apparatus.
It is preferred that, the low-converter module includes waveguide switch, for the 3mm signals to be divided into two frequency ranges, point
It is not filtered.
It is preferred that, the low-converter module includes frequency multiplier, bandpass filter and power amplifier, is respectively used to institute
State local oscillation signal frequency multiplication, filtering and amplify.
On the other hand, measuring method, bag are spread in high precision the invention provides a kind of 3mm band noises coefficient single-side belt
Include：
Measured piece exports radiofrequency signal to 3mm the rf inputs mouthful for spreading device under the excitation of 3mm noise sources；
Band logical of the radiofrequency signal through the first isolator, waveguide switch and suppression image response inside spread spectrum device is filtered
Ripple device is filtered out after image response, input to 3mm fundamental mixers；
It is mixed in the fundamental mixer with corresponding local oscillation signal, exports intermediate-freuqncy signal；
The intermediate-freuqncy signal is sent to microwave noise coefficient analysis instrument after intermediate frequency amplification and channel gain.
Further, this method also includes：
Through signal transacting and computing in microwave noise coefficient analysis instrument, gain and the noise system of the measured piece are obtained
Number, and with figure, form or tester pattern, the gain of the measured piece and noise coefficient are shown.
Preferably, the bandpass filter for suppressing image response has two；
The radiofrequency signal is divided into two frequency ranges by the waveguide switch, is respectively sent to the band of two suppression image responses
Bandpass filter is filtered.
Above-mentioned technical proposal has the advantages that：
Above-mentioned technical proposal solves that the system that existing 3mm band noises coefficient testing scheme is present is huge, measurement essence
Spend the problems such as poor, measurement reproducibility and uniformity are difficult to ensure, purchased with maintenance cost height, operating difficulties.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is that the 3mm noise coefficients of prior art test the structural representation of desktop system；
Fig. 2 is the structural representation of the serial spread spectrum module schemes of K of prior art；
Fig. 3 is that the 3mm band noise coefficients single-side belt of the embodiment of the present invention one spreads the structure chart of measurement apparatus in high precision；
Fig. 4 is that the 3mm band noise coefficients single-side belt of the embodiment of the present invention two spreads the flow chart of measuring method in high precision.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The present invention provides a kind of 75~110GHz of frequency range seamless coverage, single-side belt, high-precision noise coefficient spread spectrum
Method of testing and integrated testing device, can carry out Second level amendment noise-factor measurement.Solve existing 3mm band noises system
Number testing schemes exist system it is huge, measurement accuracy is poor, measurement reproducibility and uniformity are difficult to ensure, purchased and maintenance cost
The problems such as height, operating difficulties.
Embodiment one
Spread spectrum device uses segmentation to the high-precision noise coefficient single-side belt of 3mm wave bands single-side belt that the present embodiment is provided in high precision
The fundamental wave mixing scheme of frequency conversion high intermediate frequency output, to fix local oscillator, based on intermediate frequency scanning, fixed intermediate frequency, local oscillator scanning is are aided with
And the mixed-mode that upper and lower sideband is combined, 75~110GHz frequency coverages are realized by a spread spectrum device.
As shown in figure 3, spreading the structure of measurement apparatus in high precision for a kind of 3mm band noises coefficient single-side belt of the present embodiment
Figure, including：
Low-converter module 301, microwave local oscillation synthesis module 302, control interface module 303 and power module 304；
The low-converter module 301 is used for input matching, region filtering and the down coversion for completing 3mm signals；It is additionally operable to
Realize local oscillation signal frequency multiplication, filtering and amplify, produce the millimeter wave local oscillation signal needed for fundamental mixer；And for completing to mix
The amplification and the compensation of frequency conversion channel gain flatness of frequency output intermediate-freuqncy signal；
It is preferred that, the low-converter module 301 includes waveguide switch, for the 3mm signals to be divided into two frequency ranges,
It is filtered respectively.
It is preferred that, the low-converter module 301 includes frequency multiplier, bandpass filter and power amplifier, is respectively used to
By the local oscillation signal frequency multiplication, filtering and amplification.
75~110GHz signal is divided into two frequency ranges of 75~92.5GHz and 92.5~110GHz by waveguide switch first
Be filtered respectively and down-converted, the frequency range in required local oscillation signal source be respectively 93~96.5GHz and 88.5~
92GHz, low-converter output IF-FRE scope is 4~18GHz.
The microwave local oscillation synthesis module 302, including yig tuned oscillator (YTO) and drive control circuit, for producing
Scan synthesis local oscillation signal source；11~12.5GHz of microwave local oscillator frequency range.
The control interface module 303, for realizing microwave noise coefficient analysis instrument main frame by USB intelligence interface buses
With the information exchange of this spread spectrum measurement apparatus；
The power module 304, for providing each road power supply needed for this spread spectrum measurement apparatus.
The present embodiment can reach following beneficial effect：
(1) 3mm is realized with 75~88.5GHz of K series point, 86.5~100GHz, 96.5~110GHz, tri- spread spectrum modules
The scheme of wave band all standing is compared, and the single-side belt high-acruracy survey of 3mm band noise coefficients is realized in integration of the present invention, is reduced
Testing cost, reduces system connection number of times, improves testing efficiency.
(2) employ to fix based on local oscillator, the mixing scheme supplemented by fixed intermediate frequency, reduce the high intermediate frequency of fundamental mixer
The upper limit is exported to 18GHz, the desktop system for overcoming existing fixed Low Medium Frequency mixing scheme establishment is difficult to noise coefficient list
The deficiency of sideband measurement, while meeting the optimal intermediate frequency reference frequency output of frequency mixer again, improves 3mm noise coefficients spread spectrum
The performance indications of device, own ship's noise coefficient is better than 18dB, and noise-factor measurement is uncertain to be better than 0.35dB；
(3) using the high intermediate frequency fundamental wave mixing schemes of 4~18GHz, the frequency interval of radio frequency and image frequency is up to more than 8GHz, real
Existing 3mm band noise coefficient single-side belt high-acruracy surveys；
(4) free oscillation local vibration source in the serial spread spectrum modules of K is replaced using built-in synthesis system local oscillation signal source, improved
Noise-factor measurement precision and frequency resolution；
(5) mixed-mode being combined using upper and lower sideband, full frequency band is mixed substantially only need to improve 88.5~96.5GHz
The 3mm local oscillation signals source of common 8GHz bandwidth, is reduced to the full wave requirement of existing desktop system scheme local frequency covering, section
About system acquisition cost.
Embodiment two
As shown in figure 4, spreading measuring method in high precision for a kind of 3mm band noises coefficient single-side belt of the present embodiment two
Flow chart, including：
Step 401, measured piece is under the excitation of 3mm noise sources, radiofrequency signal is exported to 3mm to the radio frequency for spreading device defeated
Inbound port；
Step 402, the radiofrequency signal through the first isolator, waveguide switch and suppresses image response inside spread spectrum device
Bandpass filter filter out after image response, input is to 3mm fundamental mixers；
Step 403, it is mixed in the fundamental mixer with corresponding local oscillation signal, exports intermediate-freuqncy signal；
Step 404, the intermediate-freuqncy signal is sent to microwave noise coefficient analysis instrument after intermediate frequency amplification and channel gain adjustment.
Further, this method also includes：
Step 405, in microwave noise coefficient analysis instrument through signal transacting and computing, obtain the measured piece gain and
Noise coefficient, and with figure, form or tester pattern, the gain of the measured piece and noise coefficient are shown.
Preferably, the bandpass filter for suppressing image response has two；
The radiofrequency signal is divided into two frequency ranges by the waveguide switch, is respectively sent to this two and is suppressed image response
Bandpass filter is filtered.
Embodiment two has the advantages that：
The embodiment two solves that the system that existing 3mm band noises coefficient testing scheme is present is huge, measurement accuracy
Difference, measurement reproducibility and uniformity be difficult to ensure, purchase with maintenance cost is high, operating difficulties the problems such as.
Those skilled in the art will also be appreciated that the various illustrative components, blocks that the embodiment of the present invention is listed
(illustrative logical block), unit and step can be by the combinations of electronic hardware, computer software, or both
Realized.To clearly show that the replaceability (interchangeability) of hardware and software, above-mentioned is various illustrative
Part (illustrative components), unit and step universally describe their function.Such function
It is that the design requirement depending on specific application and whole system is realized by hardware or software.Those skilled in the art can
So that various methods for every kind of specific application, can be used to realize described function, but this realization is understood not to surpass
Go out the scope of protection of the embodiment of the present invention.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (1)
1. a kind of 3mm band noises coefficient single-side belt spreads measurement apparatus in high precision, it is characterised in that including：Low-converter mould
Block, microwave local oscillation synthesis module, control interface module and power module；
The low-converter module is used for input matching, region filtering and the down coversion for completing 3mm signals；It is additionally operable to realize microwave
Local oscillation signal frequency multiplication, filtering and amplification, produce the millimeter wave local oscillation signal needed for fundamental mixer；And it is defeated for completing mixing
Go out the amplification and the compensation of frequency conversion channel gain flatness of intermediate-freuqncy signal；
The microwave local oscillation synthesis module, including yig tuned oscillator (YTO) and drive control circuit, sweep for producing synthesis
Retouch local oscillation signal source；
The control interface module, for realizing microwave noise coefficient analysis instrument main frame and this expansion by USB intelligence interface buses
The information exchange of frequency measurement apparatus；
The power module, for providing each road power supply needed for this spread spectrum measurement apparatus；
The low-converter module includes waveguide switch, for the 3mm signals to be divided into two frequency ranges, is filtered respectively；
The low-converter module includes frequency multiplier, bandpass filter and power amplifier, is respectively used to the local oscillation signal
Frequency multiplication, filtering and amplification；
75~110GHz 3mm signals are divided into two frequency ranges of 75~92.5GHz and 92.5~110GHz by waveguide switch first
Be filtered respectively and down-converted, the frequency range in required local oscillation signal source be respectively 93~96.5GHz and 88.5~
92GHz, low-converter output IF-FRE scope is 4~18GHz.
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| CN104993887B (en) * | 2015-05-08 | 2017-11-10 | 中国电子科技集团公司第四十一研究所 | Integrated pulse condition noise coefficient method of testing and tester |
| CN105277805B (en) * | 2015-09-14 | 2018-10-19 | 上海新爱季信息技术有限公司 | Noise coefficient aided measurement device |
| CN106713195B (en) * | 2015-11-12 | 2020-06-12 | 中兴通讯股份有限公司 | Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver |
| CN106018988B (en) * | 2016-05-24 | 2018-10-09 | 中国电子科技集团公司第四十一研究所 | A kind of multistage frequency conversion device noise coefficient automatically scanning measurement method |
| CN107276695B (en) * | 2017-06-07 | 2020-09-18 | 中国电子科技集团公司第四十一研究所 | Noise coefficient scanning and measuring method |
| CN109787562B (en) * | 2019-01-10 | 2023-06-20 | 青岛海洋科技中心 | Ultra-wideband millimeter wave frequency conversion module and assembly |
| CN110995378B (en) * | 2019-11-26 | 2021-10-15 | 中电科思仪科技股份有限公司 | Noise coefficient measurement uncertainty calculator and error analysis method |
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| CN103607215A (en) * | 2013-11-13 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Device and method for achieving spread spectrum function of spectrum analyzer |
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