CN103634024A - Device and method for realizing frequency spread function of signal analyzer - Google Patents
Device and method for realizing frequency spread function of signal analyzer Download PDFInfo
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- CN103634024A CN103634024A CN201310616148.3A CN201310616148A CN103634024A CN 103634024 A CN103634024 A CN 103634024A CN 201310616148 A CN201310616148 A CN 201310616148A CN 103634024 A CN103634024 A CN 103634024A
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- 239000002223 garnet Substances 0.000 claims description 9
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Abstract
The invention belongs to the technical field of signal processing, and relates to a device and a method for realizing the frequency spread function of a signal analyzer. The device comprises a waveguide adapter, a first waveguide switch, a second waveguide switch, a high-pass filter, a lowpass filter, a basic wave frequency mixer, a dot frequency local oscillator and a medium frequency filter amplifier; the method comprises the steps of defining a medium frequency range FIF of a frequency spread device according to the cover range of a host preselector, then configuring a dot frequency local oscillator frequency FLO according to the device frequency range FRF and FIF, and optimizing the filter design to perform waveband partitioning, wherein a frequency conversion formula (FRF-FLO) is used for the low-frequency band and is matched with the low-pass filter; a frequency conversion formula (FLO-FRF) formula is used for the high-frequency band and is matched with the high-pass filter, so the frequency spread function of the signal analyzer is comprehensively realized. The device has the function of restraining the frequency spread function of the signal analyzer by a mirror signal when the frequency range is higher than 67GHz.
Description
Technical field
The present invention relates to signal analysis instrument spread spectrum, relate in particular to a kind of apparatus and method that realize signal analysis instrument spread spectrum function, belong to signal processing technology field.
Background technology
At present signal is carried out to parameter testing 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 signal analysis instruments 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 signal analysis instrument 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 signal analysis instrument 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 that (IF is the IF-FRE of signal analysis instrument to 2IF/n, 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument spread spectrum function, comprise the steps:
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 signal analysis instrument 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
iO-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 signal analysis instrument spread spectrum function of the present invention.
Fig. 2 is a kind of schematic diagram of realizing the method for signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 is through amplifier entering signal analytical instrument main frame frequency conversion receiving front-end, 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 signal analysis instrument 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 signal analysis instrument is carried out to the method for spread spectrum, comprise the steps:
Table 15mm, 3mm frequency range spread spectrum device local oscillator and switch control algolithm
Unit: GHz
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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument spread spectrum function as claimed in claim 3, is characterized in that, described intermediate frequency output area F
iFin signal analysis instrument main frame preselector covers frequency range.
5. a method that realizes signal analysis instrument spread spectrum function, is characterized in that, comprises the steps:
Step 1, is connected spread spectrum device as follows with signal analysis instrument main frame: signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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 signal analysis instrument 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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Cited By (3)
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| 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 |
| CN111953432A (en) * | 2020-08-12 | 2020-11-17 | 南京熊猫汉达科技有限公司 | Device and method for testing emission broadband noise of high-power no-load short-wave radio station |
| CN112067874A (en) * | 2019-06-11 | 2020-12-11 | 广州汽车集团股份有限公司 | Filtering method and device suitable for vehicle sensor signal and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| CN112067874A (en) * | 2019-06-11 | 2020-12-11 | 广州汽车集团股份有限公司 | Filtering method and device suitable for vehicle sensor signal and storage medium |
| CN111953432A (en) * | 2020-08-12 | 2020-11-17 | 南京熊猫汉达科技有限公司 | Device and method for testing emission broadband noise of high-power no-load short-wave radio station |
| CN111953432B (en) * | 2020-08-12 | 2024-02-13 | 南京熊猫汉达科技有限公司 | High-power idle short wave radio station emission broadband noise testing device and method |
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