CN103607215A - Device and method for achieving spread spectrum function of spectrum analyzer - Google Patents

Device and method for achieving spread spectrum function of spectrum analyzer Download PDF

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Publication number
CN103607215A
CN103607215A CN201310603251.4A CN201310603251A CN103607215A CN 103607215 A CN103607215 A CN 103607215A CN 201310603251 A CN201310603251 A CN 201310603251A CN 103607215 A CN103607215 A CN 103607215A
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frequency
spread spectrum
signal
pass filter
waveguide
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CN103607215B (en
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杜以涛
许建华
杜会文
崔素玲
周钦山
郭小文
闫亚力
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China Electronics Technology Instruments Co Ltd CETI
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CETC 41 Institute
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Abstract

The invention belongs to the technical field of signal processing, and relates to a device and method for achieving the spread spectrum function of a spectrum analyzer. The device comprises a waveguide adaptor, a first waveguide switch, a second waveguide switch, a high-pass filter, a low-pass filter, a fundamental wave mixer, a dot frequency local oscillator and an intermediate frequency filter amplifier. The method includes the steps that firstly, FIF of the intermediate frequency range of a spread spectrum device is defined according to the coverage area of a preselector of a host, and then FLO of frequency of the dot frequency local oscillator is configured according to FRF of the frequency range of the device and the FIF; secondly, the design of the filters is optimized, wavebands are divided, the frequency conversion formula (FRF-FLO) is used for a low-frequency band, and the low-pass filter is matched; the frequency conversion formula (FLO-FRF) is used for a high-frequency band, and the high-pass filter is matched, and then the spread spectrum function of the spectrum analyzer is comprehensively achieved. According to the device and method, when the frequency range is higher than 67GHz, the spread spectrum function of the spectrum analyzer for image signal curbing can be also achieved.

Description

A kind of apparatus and method that realize spectrum analyzer spread spectrum function
Technical field
The present invention relates to spectrum analyzer spread spectrum, relate in particular to a kind of apparatus and method that realize spectrometer spread spectrum function, belong to signal processing technology field.
Background technology
At present signal is carried out to frequency spectrum parameter test and there is multiple instrument.Single instrument and equipment that frequency parameter is measured has frequency meter, and single instrument and equipment that signal amplitude is measured has power meter, and comprehensive two kinds of functions are spectrum analyzers in one, are characterized in measuring frequency wide ranges, and amplitude measurement scope is large.
Signal input connector has two types at present: coaxial and waveguide.Coaxial connector is applicable to lower frequency range, and waveguide connector is applicable to higher frequency range.The coaxial measurement range of spectrum analyzer main frame is generally between DC～67GHz, and higher measuring frequency scope is subject to input signal connector characteristic limitations, the general spread spectrum mode that adopts realizes, the local oscillator that is about to main frame is drawn, in spread spectrum module inside, carry out harmonic mixing with input signal, the intermediate-freuqncy signal of generation turns back in main frame and further processes.The spread spectrum device of prior art all adopts high order harmonic component mixing mode, according to the mixing formula presetting, utilizes the output of main frame local oscillator and intermediate frequency input interface, configures corresponding control algolithm, realizes the expansion of spectrum analyzer measuring frequency scope.But often there is following defect: 1, frequency mixer front end is normally used for filtering image response (optical mixing process at present, there are two input signals energy and same frequency local oscillation signal to produce identical intermediate-freuqncy signal, they one than the low intermediate frequency of local oscillator, one than the high intermediate frequency of local oscillator, one of them signal is called the image response of another signal) preselector, higher than 67GHz, with super band, cannot realize, 2, current general spread spectrum module adopts higher harmonics number of times, the Low Medium Frequency frequency way of output, directly enters main frame intermediate-frequency channel, cannot filtering image signal, 3, the image response of current general spread spectrum module suppresses the built-in content software algorithms of instrument that adopt more, utilize spurious signal to have the advantages that to change with local frequency, scanning at twice, local frequency difference is the 2IF/n (IF-FRE that IF is spectrum analyzer, n is the harmonic mixing number of times of spread spectrum module), measurement result is carried out to minimizing operation, the signal that the signal not changing with local oscillator is like this necessary being, but due to software algorithm relation, signal amplitude is less than normal than actual value, and all need two times result to carry out superposition at every turn, cause measuring speed slack-off, do not meet spectrum analyzer amplitude measurement accuracy high, the demand that measuring speed is fast, 4, image response suppresses also to adopt instrument external control software algorithm or manual calculations mode, according to the IF-FRE of concrete instrument and harmonic number, calculate the frequency interval of each response point, account form by harmonic mixing can be distinguished actual signal and spurious signal, not only needs very strong instrument to form professional knowledge, and needs long separated spurious signal computing time, measuring speed is slower, does not meet test request, 5, existing spread spectrum mode adopts the conversion loss of harmonic mixing mode to increase, and main frame has been reduced to small-signal measurement capability.
Can therefore, design a kind of novel spectrum analyzer spread spectrum device and spectrum spreading method thereof to overcome above-mentioned defect, becoming those skilled in the art has technical barrier to be solved.
Summary of the invention
Because the above-mentioned defect of prior art, the present invention aims to provide a kind of device and method of realizing spectrum analyzer spread spectrum function, can still possess in frequency range spectrum analysis spread spectrum function during higher than 67GHz, and can realize the inhibition of mirror image, multiple spurious signal, and do not reduce small-signal measurement capability.
Realization of the present invention, this device of realizing spectrometer spread spectrum function comprises: waveguide adaptor, first wave guide switch, the second waveguide switch, high pass filter, low pass filter, fundamental wave mixing device, spot-frequency local oscillation and intermediate frequency filtering amplifier, wherein, waveguide adaptor is connected with first wave guide switch, first wave guide switch respectively with high pass filter, the input of low pass filter connects, high pass filter, the output of low pass filter is connected with the second waveguide switch respectively, the second waveguide switch, fundamental wave mixing device is connected in turn with spot-frequency local oscillation, fundamental wave mixing device is connected with intermediate frequency filtering amplifier.
In some technical schemes, the local frequency scope F of spot-frequency local oscillation lOmeet following requirement: F lO=2*n*YTO, the harmonic mixing number of times that wherein n is spread spectrum module, YTO is yttrium iron garnet oscillator output frequency.
In some technical schemes, intermediate frequency output area F iF=local frequency scope F lO-input signal frequency range F rF, or intermediate frequency output area F iF=input signal frequency range F rF-local frequency scope F lO.
In some technical schemes, intermediate frequency output area F iFin spectrum analyzer main frame preselector covers frequency range.
In some technical schemes, yttrium iron garnet oscillator output frequency 3.1～9.9GHz, step value is 200MHz.
In some technical schemes, intermediate frequency output area F iFbetween 4～26.5GHz.
The invention also discloses a kind of method that realizes spectrum analyzer spread spectrum function, it comprises the steps:
Step 1, is connected spread spectrum device as follows with spectrum analyzer main frame: spectrum analyzer main frame is connected to first wave guide switch, the second waveguide switch, spot-frequency local oscillation and the intermediate frequency filtering amplifier in spread spectrum device;
Step 2, to waveguide adaptor input signal, signal enters first wave guide switch through waveguide adaptor;
Step 3, the state parameter arranging according to spectrum analyzer main frame, the waveguide switch state in configuration spread spectrum device, makes signal through different filters, in different working frequency range;
Step 4, by the synthetic road after the second waveguide switch of the signal after low-pass filtering and high-pass filtering, sends into fundamental wave mixing device and spot-frequency local oscillation mixing;
Step 5, adopts the conversion loss of intermediate frequency filtering amplifier offset frequency mixer, improves the amplitude that enters host signal;
Step 6, sends into intermediate-freuqncy signal in the rf inputs mouth of spectrum analyzer main frame, realizes the multiplexing of preselector in main frame, filtering image signal, and enter intermediate frequency amplification filtering sampling processing process.
In some technical schemes, the local frequency scope F of spot-frequency local oscillation lOmeet following requirement: F lO=2*n*YTO, the harmonic mixing number of times that wherein n is spread spectrum module, YTO is yttrium iron garnet oscillator output frequency.
In some technical schemes, yttrium iron garnet oscillator output frequency 3.1～9.9GHz, step value is 200MHz.
In some technical schemes, described intermediate frequency output area F iFbetween 4～26.5GHz.
In some technical schemes, according to the IF-FRE scope F of spread spectrum device iFwithin the scope of spectrum analyzer main frame preselector covering frequence, according to fundamental wave mixing computing formula successively collocation point frequency local frequency scope F lOand between filter inhibition zone, comprehensively realize image frequency and suppress and spread spectrum function.
In some technical schemes, according to spread spectrum device input signal frequency range, spot-frequency local oscillation frequency range F lOwith IF-FRE scope F iFconfiguration, comprehensive coordination wave band division is carried out in spread spectrum device overlay area.
In some technical schemes, low-frequency range is utilized frequency conversion formula: input signal frequency range F rF-local frequency scope F lO, coordinate the high pass characteristic of waveguide device and low pass filter combination to realize image frequency signal inhibition.
In some technical schemes, high band utilizes frequency conversion formula: local frequency scope F lO-input signal frequency range F rF, coordinate high pass filter, realize image frequency signal and suppress.
Compared with prior art, beneficial effect of the present invention is as follows:
1. by special-purpose testing apparatus and multiplexing preselector, realize spread spectrum function, hardware is realized mirror image and is suppressed, and without repeatedly software computing, improves measuring speed, can realize spectrum analysis function within the scope of millimeter wave frequency band;
2. fundamental wave mixing mode increases substantially small-signal measurement capability and accuracy of measurement.
Below with reference to accompanying drawing, the technique effect of design of the present invention, concrete structure and generation is described further, to understand fully object of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of realizing the device of spectrum analyzer spread spectrum function of the present invention.
Fig. 2 is a kind of schematic diagram of realizing the method for spectrum analyzer spread spectrum function of the present invention.
Fig. 3 a is that existing spread spectrum device does not add software signal recognizer test design sketch.
Fig. 3 b is that existing spread spectrum device adds common software signal Recognition Algorithm test design sketch.
Fig. 3 c is spread spectrum device and method application testing design sketch of the present invention.
Symbol description
1 waveguide adaptor
2 first wave guide switches (waveguide switch 1)
3 second waveguide switches (waveguide switch 2)
4 high pass filters
5 low pass filters
6 fundamental wave mixing devices
7 spot-frequency local oscillations
8 intermediate frequency filtering amplifiers
Embodiment
Be illustrated in figure 1 the embodiment of the invention, this device of realizing spectrum analyzer spread spectrum function mainly comprises: waveguide adaptor 1, first wave guide switch 2, the second waveguide switch 3, high pass filter 4, low pass filter 5, fundamental wave mixing device 6, spot-frequency local oscillation 7 and intermediate frequency filtering amplifier 8, wherein, waveguide adaptor 1 is connected with first wave guide switch 2, first wave guide switch 2 respectively with high pass filter 4, the input of low pass filter 5 connects, high pass filter 4, the output of low pass filter 5 is connected with the second waveguide switch 3 respectively, the second waveguide switch 3, fundamental wave mixing device 6 is connected in turn with spot-frequency local oscillation 7, fundamental wave mixing device 6 is connected with intermediate frequency filtering amplifier 8.
This device collocation spectrum analyzer main frame, adopt fundamental wave mixing, the conversion system of spot-frequency local oscillation, reduce conversion loss, utilize the high pass characteristic of waveguide device, and the local oscillator of collaborative planning and low pass filter, it is logical that combination realizes band, the inhibition of realization to image frequency signal, high local oscillator fundamental signal and switch filter are according to the configuration of mixing up and down of Rational choice, the inhibition zone of the generation region waveguide filter of image signal is overlapping, realizing far-end mirror image suppresses, intermediate-freuqncy signal enters spectrum analyzer main frame frequency conversion receiving front-end through amplifier, utilize the tunable optic filter of main frame front end, filtering image signal, can realize the signal spectral analysis function within the scope of millimeter wave frequency band, possesses image signal inhibit feature, do not need the correction of host software algorithm and outside secondary calculating to carry out signal identification, can significantly improve small-signal measurement capability.
In a preferred embodiments, the local frequency scope F of spot-frequency local oscillation 7 lOmeet following requirement:
F LO=2*n*YTO；
The harmonic mixing number of times that wherein n is spread spectrum module, YTO is YIG (yttrium iron garnet) oscillator output frequency.
In a preferred embodiments, intermediate frequency output area F iF=local frequency scope F lO-input signal frequency range F rF, or intermediate frequency output area F iF=input signal frequency range F rF-local frequency scope F lO.
In a preferred embodiments, intermediate frequency output area F iFin spectrum analyzer main frame preselector covers frequency range.
In a preferred embodiments, this YIG (yttrium iron garnet) oscillator output frequency 3.1～9.9GHz, step value is 200MHz.
In a preferred embodiments, intermediate frequency output area F iF=input signal frequency range FRF-local frequency scope F lO.
In a preferred embodiments, intermediate frequency output area F iFbetween 4～26.5GHz.
As shown in Figure 2, the invention also discloses a kind of said apparatus that adopts and spectrum analyzer is carried out to the method for spread spectrum, comprise the steps:
Step 1, is connected spread spectrum device as follows with spectrum analyzer main frame: spectrum analyzer main frame is connected to first wave guide switch 2, the second waveguide switch 3, spot-frequency local oscillation 7 and the intermediate frequency filtering amplifier 8 in spread spectrum device;
Step 2, to waveguide adaptor input signal, signal enters first wave guide switch through waveguide adaptor;
Step 3, the state parameter arranging according to spectrum analyzer main frame, the waveguide switch state in configuration spread spectrum device, makes signal through different filters, in different working frequency range.The 3mm frequency range 75GHz～110GHz of take is example, is divided into four wave band: 75～80GHz, and 80～92.5GHz utilizes waveguide switch to walk low pass filter path, and mirror image inhibition point is 99.2～115.2GHz; 92.5～104GHz, 104～110GHz, utilizes waveguide switch to walk high pass filter path, and mirror image inhibition point is 68～84.8GHz, and parameters is in Table 1 in detail.
Table 15mm, 3mm frequency range spread spectrum device local oscillator and switch control algolithm
Unit: GHz
Figure BSA0000098060990000061
Step 4, by the synthetic road after the second waveguide switch of the signal after low-pass filtering and high-pass filtering, sends into fundamental wave mixing device and spot-frequency local oscillation mixing.Its feature is that local frequency is high, and conversion loss is little, and intermediate frequency is output as between 4～26.5GHz.
Step 5, adopts the conversion loss of intermediate frequency filtering amplifier offset frequency mixer, improves the amplitude that enters host signal, with this, improves the signal to noise ratio of measurement.
Step 6, intermediate-freuqncy signal is sent into the rf inputs mouth of spectrum analyzer main frame, (because its frequency range is consistent with the working frequency range of high band preselector in main frame) realizes the multiplexing of preselector in main frame, with filtering image signal, and through intermediate frequency amplification filtering sampling processing process.
In a preferred embodiments, the local frequency scope F of spot-frequency local oscillation 7 lOmeet following requirement:
F LO=2*n*YTO；
The harmonic mixing number of times that wherein n is spread spectrum module, YTO is YIG (yttrium iron garnet) oscillator output frequency.
In a preferred embodiments, this YIG (yttrium iron garnet) oscillator output frequency 3.1～9.9GHz, step value is 200MHz.
In a preferred embodiments, intermediate frequency output area F iF=input signal frequency range FRF-local frequency scope F lO.
In a preferred embodiments, intermediate frequency output area F iFbetween 4～26.5GHz.
In a preferred embodiments, according to the IF-FRE scope F of spread spectrum device iFwithin the scope of spectrum analyzer main frame preselector covering frequence, according to fundamental wave mixing computing formula successively collocation point frequency local frequency scope F lOand between filter inhibition zone, comprehensively realize image frequency and suppress and spread spectrum function.
In a preferred embodiments, according to spread spectrum device input signal frequency range, spot-frequency local oscillation frequency range F lOwith IF-FRE scope F iFconfiguration, comprehensive coordination wave band division is carried out in spread spectrum device overlay area.
In a preferred embodiments, low-frequency range is utilized frequency conversion formula: input signal frequency range F rF-local frequency scope F lO, coordinate the high pass characteristic of waveguide device and low pass filter combination to realize image frequency signal inhibition.
In a preferred embodiments, high band utilizes frequency conversion formula: local frequency scope F lO-input signal frequency range F rF, coordinate high pass filter, realize image frequency signal and suppress.
Sketch for example the concrete application of the solution of the present invention below:
In actual applications, adopt three kinds of different spread spectrum apparatus/methods to carry out the contrast test of spectrometer spread spectrum: 1, existing spread spectrum device does not add software signal recognizer; 2, existing spread spectrum device adds common software signal Recognition Algorithm; 3, spread spectrum device and method of the present invention, the application testing design sketch of acquisition is respectively as shown in Fig. 3 a-3c.As can be seen from the figure, compared to prior art, the present invention can meet the high accuracy of spread spectrum, the high-speed and requirement of processing small-signal better.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skills just can design according to the present invention make many modifications and variations without creative work.Therefore, all those skilled in the art, all should be in the determined protection range by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (9)

1. a device of realizing spectrum analyzer spread spectrum function, it is characterized in that, comprise: waveguide adaptor (1), first wave guide switch (2), the second waveguide switch (3), high pass filter (4), low pass filter (5), fundamental wave mixing device (6), spot-frequency local oscillation (7) and intermediate frequency filtering amplifier (8), wherein, described waveguide adaptor (1) is connected with described first wave guide switch (2), described first wave guide switch (2) respectively with described high pass filter (4), the input of low pass filter (5) connects, described high pass filter (4), the output of low pass filter (5) is connected with described the second waveguide switch (3) respectively, described the second waveguide switch (3), fundamental wave mixing device (6) is connected in turn with spot-frequency local oscillation (7), described fundamental wave mixing device (6) is connected with described intermediate frequency filtering amplifier (8).
2. a kind of device of realizing spectrum analyzer spread spectrum function as claimed in claim 1, is characterized in that, the local frequency scope F of described spot-frequency local oscillation (7) lOmeet following requirement: F lO=2*n*YTO, the harmonic mixing number of times that wherein n is spread spectrum module, YTO is yttrium iron garnet oscillator output frequency.
3. a kind of device of realizing spectrometer spread spectrum function as claimed in claim 2, is characterized in that, intermediate frequency output area F iF=local frequency scope F lO-input signal frequency range F rF, or intermediate frequency output area F iF=input signal frequency range F rF-local frequency scope F lO.
4. a kind of device of realizing spectrometer spread spectrum function as claimed in claim 3, is characterized in that, described intermediate frequency output area F iFin spectrum analyzer main frame preselector covers frequency range.
5. a method that realizes spectrometer spread spectrum function, is characterized in that, comprises the steps:
Step 1, is connected spread spectrum device as follows with spectrum analyzer main frame: spectrum analyzer main frame is connected to first wave guide switch, the second waveguide switch, spot-frequency local oscillation and the intermediate frequency filtering amplifier in spread spectrum device;
Step 2, to waveguide adaptor input signal, signal enters first wave guide switch through waveguide adaptor;
Step 3, the state parameter arranging according to spectrum analyzer main frame, the waveguide switch state in configuration spread spectrum device, makes signal through different filters, in different working frequency range;
Step 4, by the synthetic road after the second waveguide switch of the signal after low-pass filtering and high-pass filtering, sends into fundamental wave mixing device and spot-frequency local oscillation mixing;
Step 5, adopts the conversion loss of intermediate frequency filtering amplifier offset frequency mixer, improves the amplitude that enters host signal;
Step 6, sends into intermediate-freuqncy signal in the rf inputs mouth of spectrum analyzer main frame, realizes the multiplexing of preselector in main frame, and filtering image signal, goes forward side by side into main frame frequency conversion reception & disposal path.
6. a kind of method that realizes spectrum analyzer spread spectrum function as claimed in claim 5, is characterized in that, according to the IF-FRE scope F of spread spectrum device iFwithin the scope of spectrum analyzer main frame preselector covering frequence, according to fundamental wave mixing computing formula successively collocation point frequency local frequency scope F lOand between filter inhibition zone, comprehensively realize image frequency and suppress and spread spectrum function.
7. a kind of method that realizes spectrometer spread spectrum function as claimed in claim 6, is characterized in that, according to spread spectrum device input signal frequency range, spot-frequency local oscillation frequency range F lOwith IF-FRE scope F iFconfiguration, comprehensive coordination wave band division is carried out in spread spectrum device overlay area.
8. a kind of method that realizes spectrometer spread spectrum function as claimed in claim 7, is characterized in that, low-frequency range is utilized frequency conversion formula: input signal frequency range F rF-local frequency scope F lO, coordinate the high pass characteristic of waveguide device and low pass filter combination to realize image frequency signal inhibition.
9. a kind of method that realizes spectrometer spread spectrum function as claimed in claim 9, is characterized in that, high band utilizes frequency conversion formula: local frequency scope F lO-input signal frequency range F rF, coordinate high pass filter, realize image frequency signal and suppress.
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CN104133110A (en) * 2014-07-29 2014-11-05 中国电子科技集团公司第四十一研究所 Method for achieving cursor for frequency hopping signal time-frequency characteristic measurement
CN104459652A (en) * 2014-12-04 2015-03-25 中国电子科技集团公司第四十一研究所 High-precision 3 mm-waveband single-side-band noise coefficient spread spectrum measurement device and method
CN106093566A (en) * 2016-05-18 2016-11-09 中国电子科技集团公司第四十研究所 A kind of switch frequency conversion assembly
CN106095705A (en) * 2016-05-18 2016-11-09 中国电子科技集团公司第四十研究所 A kind of apparatus and method realizing signal/spectrum analyzer ultra broadband spread spectrum
CN106896268A (en) * 2015-12-18 2017-06-27 苏州普源精电科技有限公司 A kind of frequency expansion device, the spectrum analyzer for possessing spread spectrum function
CN110719116A (en) * 2018-07-11 2020-01-21 罗德施瓦兹两合股份有限公司 Portable RF receiver module and portable antenna device
CN110988512A (en) * 2019-10-24 2020-04-10 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） Microwave device testing system and microwave device testing method
CN113311228A (en) * 2021-05-28 2021-08-27 中电科思仪科技股份有限公司 Terahertz spectrum analysis device and spectrum analysis method

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CN104133110A (en) * 2014-07-29 2014-11-05 中国电子科技集团公司第四十一研究所 Method for achieving cursor for frequency hopping signal time-frequency characteristic measurement
CN104133110B (en) * 2014-07-29 2017-01-11 中国电子科技集团公司第四十一研究所 Method for achieving cursor for frequency hopping signal time-frequency characteristic measurement
CN104459652A (en) * 2014-12-04 2015-03-25 中国电子科技集团公司第四十一研究所 High-precision 3 mm-waveband single-side-band noise coefficient spread spectrum measurement device and method
CN104459652B (en) * 2014-12-04 2017-09-26 中国电子科技集团公司第四十一研究所 A kind of 3mm band noises coefficient single-side belt spreads measurement apparatus and method in high precision
CN106896268A (en) * 2015-12-18 2017-06-27 苏州普源精电科技有限公司 A kind of frequency expansion device, the spectrum analyzer for possessing spread spectrum function
CN106095705A (en) * 2016-05-18 2016-11-09 中国电子科技集团公司第四十研究所 A kind of apparatus and method realizing signal/spectrum analyzer ultra broadband spread spectrum
CN106093566A (en) * 2016-05-18 2016-11-09 中国电子科技集团公司第四十研究所 A kind of switch frequency conversion assembly
CN106093566B (en) * 2016-05-18 2018-10-30 中国电子科技集团公司第四十一研究所 A kind of switch frequency conversion component
CN106095705B (en) * 2016-05-18 2019-04-30 中国电子科技集团公司第四十一研究所 It is a kind of to realize signal/spectrum analyzer ultra wide band spread spectrum device and method
CN110719116A (en) * 2018-07-11 2020-01-21 罗德施瓦兹两合股份有限公司 Portable RF receiver module and portable antenna device
CN110988512A (en) * 2019-10-24 2020-04-10 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） Microwave device testing system and microwave device testing method
CN113311228A (en) * 2021-05-28 2021-08-27 中电科思仪科技股份有限公司 Terahertz spectrum analysis device and spectrum analysis method
CN113311228B (en) * 2021-05-28 2022-08-23 中电科思仪科技股份有限公司 Terahertz spectrum analysis device and spectrum analysis method

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