CN109450566A - The method and apparatus that measurement microwave receiver is mutually made an uproar - Google Patents
The method and apparatus that measurement microwave receiver is mutually made an uproar Download PDFInfo
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- CN109450566A CN109450566A CN201811202765.8A CN201811202765A CN109450566A CN 109450566 A CN109450566 A CN 109450566A CN 201811202765 A CN201811202765 A CN 201811202765A CN 109450566 A CN109450566 A CN 109450566A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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Abstract
A kind of method and apparatus that measurement microwave receiver is mutually made an uproar, it is related to technical field of micro communication, the method that the measurement microwave receiver is mutually made an uproar is: the signal that a subtest source exports first being divided into upper branch test signal and lower branch tests signal, upper branch test signal, which enters, exports upper branch intermediate-freuqncy signal after progress frequency conversion in the microwave receiver of upper branch, lower branch test signal, which enters in lower branch, first to carry out exporting lower branch intermediate-freuqncy signal after frequency conversion carries out phase shift again, obtained upper branch intermediate-freuqncy signal and lower branch intermediate-freuqncy signal are first mixed again, low-pass filtering is carried out again, finally carry out Fourier analysis, obtain the value of mutually making an uproar of microwave receiver.The present invention is based on microwave signal process technologies to construct a kind of method and apparatus that measurement microwave receiver is mutually made an uproar, and can effectively realize the measurement mutually made an uproar to microwave receiver.
Description
Technical field
The present invention relates to technical field of micro communication, a kind of especially method and apparatus that measurement microwave receiver is mutually made an uproar.
Background technique
Microwave telecommunication system has been widely used in the fields such as communication, remote sensing telemetering, radar and precise measurement, microwave
Core component of the receiver as microwave telecommunication system influences the performance of system most important.
In the field of communications, phase noise (referred to as mutually making an uproar) is an important indicator of microwave receiver, is usually used in measuring
Size of the receiver to carrier phase annoyance level.Phase noise can be divided into mutually making an uproar for signal and make an uproar with the additional phase of device or system
Mutually making an uproar for two major classes, device or system refers to when signal passes through the device or system (such as various radio-frequency devices) " transmission " or " place
Reason " after, inside it under the action of noise caused phase of output signal random variation.
Currently, be related to there are many technologies of phase noise measurement, such as: it is direct frequency spectrograph method, frequency-discrimination method, Phase Demodulation, double
The characteristics of channel cross-correlation method etc., these methods, is different, and the scope of application is also not quite similar, however they are measuring signal source phases
The test method made an uproar is not preferably used for measurement of mutually making an uproar for microwave receiver, and in the field of communications, there are no preferable for surveying
The standard method and commercial apparatus equipment that amount microwave receiver is mutually made an uproar.
Summary of the invention
The present invention is based on microwave signal process technologies to construct a kind of method and apparatus that measurement microwave receiver is mutually made an uproar, can
Effectively realize the measurement mutually made an uproar to microwave receiver.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme: what a kind of measurement microwave receiver was mutually made an uproar
Method and apparatus, comprising: subtest source, power splitter 1, power splitter 2, frequency mixer 2, narrow band filter, phase shifter, frequency mixer 3,
Low-pass filter and fourier analyzer；
The subtest source is connect with the input terminal of power splitter 1, and two output ends of the power splitter 1 connect with microwave respectively
The input terminal connection of the microwave input port and frequency mixer 2 of receipts machine；
The input terminal of the power splitter 2 and the local oscillator source output terminal of microwave receiver connect, and two of the power splitter 2 are defeated
Outlet is connected with 1 input terminal of frequency mixer of another input terminal of frequency mixer 2 and microwave receiver respectively；
The input terminal of the output end of the frequency mixer 2 and narrow band filter connects, the output end of the narrow band filter with
The input terminal of phase shifter connects, and it is two defeated to be connected to frequency mixer 3 for the output end of the phase shifter and the output end of microwave receiver
Enter end, the output end of the frequency mixer 3 and the input terminal of low-pass filter connect, the output end and Fourier of the low-pass filter
The connection of leaf analysis device.
Further, the device that above-mentioned measurement microwave receiver is mutually made an uproar further includes adjustable amplifier 1, the adjustable amplifier
1 input terminal and output end is connected with the input terminal of the output end of phase shifter and frequency mixer 3 respectively.
Preferably, the subtest source is a single frequency point signal source, the working frequency and microwave in the single frequency point signal source
The working frequency of receiver is identical.
As another side of the invention, the method that microwave receiver is mutually made an uproar is measured, comprising the following steps:
1) signal that a subtest source exports is divided into upper branch test signal and lower branch tests signal, it is described on
Branch tests signal into the upper branch intermediate-freuqncy signal of output, the lower branch drive test after progress frequency conversion in the microwave receiver of upper branch
Trial signal, which enters in lower branch, first to carry out exporting lower branch intermediate-freuqncy signal after frequency conversion carries out phase shift again；
2) upper branch intermediate-freuqncy signal that step 1) obtains and lower branch intermediate-freuqncy signal are first mixed, then carry out low pass filtered
Wave finally carries out Fourier analysis, obtains the value of mutually making an uproar of microwave receiver.
Further, the subtest source be a single frequency point signal source, the working frequency in the single frequency point signal source with it is micro-
The working frequency of wave receiver is identical.
Further, the signal that subtest source exports is divided by upper branch drive test using power splitter 1 in the step 1)
Trial signal and lower branch test signal.
Still further, the microwave receiver of the upper branch is shaken by the single-frequency point that power splitter 2 exports its local vibration source
It swings signal and is divided into branch oscillator signal and lower branch oscillation source signal, the upper branch oscillation source signal passes through microwave receiving
The frequency mixer of machine is mixed with upper branch test signal.
Further, in step 1), the lower branch test signal first passes through the frequency mixer 2 and lower branch of lower branch
Oscillation source signal is mixed, then carries out frequency-selecting by narrow band filter, and the odd-multiple phase of pi/2 is then carried out by phase shifter
It moves, branch intermediate-freuqncy signal under final output.
Further, in step 1), the signal after phase shift also passes through adjustable amplifier 1 and amplifies, final output
Lower branch intermediate-freuqncy signal.
Preferably, in the step 2), upper branch intermediate-freuqncy signal and lower branch intermediate-freuqncy signal are mixed by frequency mixer 3
Frequently, output includes the baseband signal of microwave receiver phase information, the baseband signal pass through again low-pass filter carry out it is low
Enter in fourier analyzer after pass filter and carry out spectrum analysis, finally obtains the value of mutually making an uproar of microwave receiver.
The present invention is based on microwave signal process technologies, first distinguish the two way microwave signals separated from subtest source
Signal processing is carried out in access microwave receiver and lower branch and obtains two-way intermediate-freuqncy signal, then two-way intermediate-freuqncy signal is mixed
Frequently, it and then extracts and physical quantity and carries out Fourier analysis about mutually making an uproar for microwave receiver, solution is mutually made an uproar data needed for obtaining.This
Inventive concept is simple and ingenious, has filled up current microwave receiver both at home and abroad and has mutually made an uproar the blank of measuring device, has constructed a kind of survey
The method and apparatus that amount microwave receiver is mutually made an uproar, can effectively realize the measurement mutually made an uproar to microwave receiver, both easy to operate, and
The accuracy of measurement result is high.
Detailed description of the invention
Fig. 1 is the structural block diagram of typical microwave receiver；
Fig. 2 is the structural block diagram for the device that present invention measurement microwave receiver is mutually made an uproar.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is further said below with reference to embodiment and attached drawing
Bright, the content that embodiment refers to not is limitation of the invention.
In the prior art, according to the functional characteristic of microwave receiver, microwave circuit, local vibration source, mixing can be classified as
Four parts of device and intermediate-frequency circuit, Fig. 1 are the structural block diagram of typical microwave receiver, wherein the cable of 1 front end of frequency mixer,
Adjustable amplifier 2, filter 1 constitute microwave circuit, and filter 2, the adjustable amplifier 3 of frequency mixer rear end constitute medium frequency electric
Road；Microwave circuit is used for transmission and processing microwave signal；Local vibration source is for providing single-frequency point oscillator signal；Microwave signal and local oscillator
The single-frequency point oscillator signal that source provides is mixed by frequency mixer, realizes intermediate frequency output；The intermediate-freuqncy signal of the output can pass through
Intermediate-frequency circuit completes the signal processings such as filtering, amplification.
The device that measurement microwave receiver is mutually made an uproar involved by present embodiment can be used for measuring mutually making an uproar for microwave receiver, such as
Shown in Fig. 2, which includes: subtest source, power splitter 1, power splitter 2, frequency mixer 2, narrow band filter, phase shifter, mixing
Device 3, low-pass filter and fourier analyzer；
Wherein, subtest source is connect with the input terminal of power splitter 1, and two output ends of power splitter 1 are respectively and microwave receiving
The input terminal connection of the microwave input port and frequency mixer 2 of machine；The input terminal of power splitter 2 and the local oscillator source output terminal of microwave receiver
Connection, two output ends of power splitter 2,1 input terminal of frequency mixer with another input terminal of frequency mixer 2 and microwave receiver respectively
Connection；The output end of frequency mixer 2 and the input terminal of narrow band filter connect, the input of the output end and phase shifter of narrow band filter
End connection, the output end of phase shifter and the output end of microwave receiver are connected to two input terminals of frequency mixer 3, frequency mixer 3 it is defeated
The connection of the input terminal of outlet and low-pass filter, the output end of low-pass filter are connect with fourier analyzer.
Further, the device that above-mentioned measurement microwave receiver is mutually made an uproar further includes adjustable amplifier 1, adjustable amplifier 1
Input terminal and output end are connected with the input terminal of the output end of phase shifter and frequency mixer 3 respectively.
Still further, above-mentioned subtest source is a single frequency point signal source, can be needed according to actual test when work pair
Its frequency is selected, and is such as needed to test microwave receiver mutually making an uproar in working frequency f, then should be selected the auxiliary of same working frequency
Test source is helped, the measuring device is to the intensity and initial phase in subtest source without strict demand.
The device measurement typical microwave receiver that the measurement microwave receiver that embodiment is related to mutually is made an uproar is stated in use
(definition microwave receiver is upper branch, and frequency mixer 2, narrow band filter, phase shifter and adjustable amplifier 1 are sequentially connected in series when mutually making an uproar
The route of formation is lower branch):
The single frequency point signal of subtest source output is divided into branch by power splitter 1 and tests signal and the test of lower branch
Signal；In microwave receiver local vibration source export single-frequency point oscillator signal by power splitter 2 be divided into branch oscillator signal and
Lower branch vibrates source signal.
Aforementioned upper branch test signal enters in the microwave receiver of upper branch, first passes through cable transmission to adjustable amplifier
2, by being carried out in frequency mixer 1 with the upper branch oscillator signal separated by local vibration source after 1 frequency-selecting of filter after amplification
Mixing, then the intermediate-freuqncy signal after mixing is chosen by filter 2, loss balancing then is completed using adjustable amplifier 3, finally
Branch intermediate-freuqncy signal exports in realization.
Aforementioned lower branch test signal enters in lower branch, the lower branch for first passing through frequency mixer 2 and being separated by local vibration source
Oscillation source signal is mixed, then carries out frequency-selecting by narrow band filter, and the odd-multiple phase shift of pi/2 is then carried out by phase shifter
It is final to realize lower branch intermediate-freuqncy signal output and by 1 electrode compensation of adjustable amplifier.
Aforementioned obtained upper branch intermediate-freuqncy signal and lower branch intermediate-freuqncy signal are mixed by frequency mixer 3, output packet
Baseband signal containing microwave receiver phase information, baseband signal enter Fu after carrying out low-pass filtering by low-pass filter again
Spectrum analysis is carried out in vertical leaf analysis device, finally obtains the value of mutually making an uproar of microwave receiver.
It is specific:
If the signal of subtest source and local vibration source output is sine wave signal,
Respectively WithThe respectively amplitude of two signals, ωRWith
ωLFor the angular frequency of two signals, θ1With θ2For the initial phase of two signals.Subtest source separates branch drive test by power splitter 1
Trial signal Acos (ωRt+θ1) and lower branch test signal Acos (ωRt+θ1), local vibration source separates branch by power splitter 2
Oscillator signal Bcos (ωLt+θ2) and lower branch oscillator signal Bcos (ωLt+θ2)。
Firstly, for upper branch.The upper branch test signal of branch and upper branch oscillator signal are connect by microwave in access
The processing of receipts machine realizes that the upper branch intermediate-freuqncy signal of intermediate frequency output may be expressed as:
Wherein, α is the loss factor of microwave circuit；β1For the conversion loss coefficient of frequency mixer 1 in microwave receiver；γ1For
The loss factor of intermediate-frequency circuit；ωIFFor the angular frequency of intermediate-freuqncy signal, Δ θ is that upper branch tests signal and upper branch oscillator signal
Phase difference,For mutually making an uproar for microwave receiver, as present apparatus measured physical quantity, in addition have:
ωIF=(ωR-ωL) (2)
Δ θ=θ1-θ2 (3)
For typical microwave receiver involved by Fig. 1, the loss factor α of microwave circuit by cable in microwave circuit insertion
I is loste, adjustable amplifier 2 voltage gain g2With the insertion loss I of filter 1f1It determines, may be expressed as:
The conversion loss coefficient β of frequency mixer 1 in microwave receiver1It may be expressed as:
Wherein Im1For the insertion loss of frequency mixer 1 in microwave receiver.
The loss factor γ of intermediate-frequency circuit1It can be indicated by the insertion loss of filter 2 and the voltage gain of adjustable amplifier 3
Are as follows:
Then, for lower branch.In lower branch, lower branch test signal is real by frequency mixer 2 and lower branch oscillator signal
Now frequency-conversion processing, then by narrow band filter frequency-selecting, and by phase shifter its phase is adjusted, controlled, finally by adjustable
1 electrode compensation of amplifier, exports lower branch intermediate-freuqncy signal, which may be expressed as:
S2=β2γ2ABcos(ωIFt+Δθ+ξ) (7)
Wherein, β2For the conversion loss coefficient of frequency mixer 2；γ2For lower branch intermediate-frequency circuit, (intermediate-frequency circuit herein is by narrow
Band filter, phase shifter, adjustable amplifier 1 form) loss factor；ξ is the phase-shift phase that phase shifter provides.β2By lower branch
Frequency mixer 2 determines, may be expressed as:
Im2For the insertion loss of frequency mixer 2；The loss factor γ of the intermediate-frequency circuit of lower branch2Then by narrow band filter and shifting
The insertion loss of phase device and the voltage gain of adjustable amplifier 1 codetermine, and may be expressed as:
Then, upper branch intermediate-freuqncy signal and lower branch intermediate-freuqncy signal are mixed in frequency mixer 3, based on formula (1) with
(7), the baseband signal after mixing may be expressed as:
Wherein, Im3For the insertion loss of frequency mixer 3, abbreviation can be obtained:
Wherein,Baseband signal filters out 2 ω eventually by low-pass filterIFFrequency
Ingredient is only left the baseband signal mutually made an uproar comprising microwave receiver, i.e., are as follows:
The control voltage of phase shifter is tuned, so thatEven if its phase-shift phase be pi/2 odd-multiple, then on
Formula abbreviation are as follows:
And noiseAbove formula continues abbreviation are as follows:
The simplified formula indicates to eventually enter into the base band letter of fourier analyzer by handling microwave signal
It number is mutually to make an uproar to microwave receiver directly proportional nearly direct current signal.
It mutually makes an uproar finally, solving.According to the definition mutually made an uproar: corresponding power and entire carrier wave in 1Hz bandwidth at carrier wave frequency deviation f
The ratio of power.It can finally obtain mutually making an uproar for microwave receiver are as follows:
Wherein FFT (Sout) it is SoutFourier series, can be acquired by fourier analyzer, PinTo be input to receiver
Microwave signal power, value isZ is the input impedance of receiver.
Above-described embodiment is the preferable implementation of the present invention, and in addition to this, the present invention can be realized with other way,
Do not depart from the technical program design under the premise of it is any obviously replace it is within the scope of the present invention.
In order to allow those of ordinary skill in the art more easily to understand the improvements of the present invention compared with the existing technology, this
Some attached drawings of invention and description have been simplified, and for the sake of clarity, present specification is omitted some other members
Element, the element that those of ordinary skill in the art should be aware that these are omitted also may make up the contents of the present invention.
Claims (10)
1. the device that measurement microwave receiver is mutually made an uproar, comprising: subtest source, power splitter 1, power splitter 2, frequency mixer 2, narrowband filter
Wave device, phase shifter, frequency mixer 3, low-pass filter and fourier analyzer；
The subtest source is connect with the input terminal of power splitter 1, and two output ends of the power splitter 1 are respectively and microwave receiver
Microwave input port and frequency mixer 2 input terminal connection；
The input terminal of the power splitter 2 and the local oscillator source output terminal of microwave receiver connect, two output ends of the power splitter 2
It is connected respectively with 1 input terminal of frequency mixer of another input terminal of frequency mixer 2 and microwave receiver；
The output end of the frequency mixer 2 and the input terminal of narrow band filter connect, the output end of the narrow band filter and phase shift
The input terminal connection of device, the output end of the phase shifter and the output end of microwave receiver are connected to two input terminals of frequency mixer 3,
The output end of the frequency mixer 3 and the input terminal of low-pass filter connect, the output end and Fourier point of the low-pass filter
Parser connection.
2. the device that measurement microwave receiver according to claim 1 is mutually made an uproar, it is characterised in that: further include adjustable amplifier
1, the input terminal and output end of the adjustable amplifier 1 are connected with the input terminal of the output end of phase shifter and frequency mixer 3 respectively.
3. the device that measurement microwave receiver according to claim 2 is mutually made an uproar, it is characterised in that: the subtest source is
One single frequency point signal source, the working frequency in the single frequency point signal source and the working frequency of microwave receiver are identical.
4. the method that measurement microwave receiver is mutually made an uproar, comprising the following steps:
1) signal that a subtest source exports is divided into upper branch test signal and lower branch tests signal, the upper branch
Signal is tested into the upper branch intermediate-freuqncy signal of output after progress frequency conversion in the microwave receiver of upper branch, the lower branch test is believed
Number enter in lower branch and first to carry out frequency conversion and carry out exporting lower branch intermediate-freuqncy signal after phase shift again；
2) upper branch intermediate-freuqncy signal that step 1) obtains and lower branch intermediate-freuqncy signal are first mixed, then carry out low-pass filtering,
Fourier analysis is finally carried out, the value of mutually making an uproar of microwave receiver is obtained.
5. the method that measurement microwave receiver according to claim 4 is mutually made an uproar, it is characterised in that: the subtest source is
One single frequency point signal source, the working frequency in the single frequency point signal source and the working frequency of microwave receiver are identical.
6. the method that measurement microwave receiver according to claim 5 is mutually made an uproar, it is characterised in that: used in the step 1)
The signal that subtest source exports is divided into upper branch test signal to power splitter 1 and lower branch tests signal.
7. the method that measurement microwave receiver according to claim 6 is mutually made an uproar, it is characterised in that: the microwave of the upper branch
The single-frequency point oscillator signal that its local vibration source exports is divided into upper branch oscillator signal by power splitter 2 for receiver and lower branch shakes
Source signal is swung, the upper branch oscillation source signal is tested signal with upper branch by the frequency mixer of microwave receiver and is mixed.
8. the method that measurement microwave receiver according to claim 7 is mutually made an uproar, it is characterised in that: described in step 1)
The frequency mixer 2 that lower branch test signal first passes through lower branch is mixed with lower branch oscillation source signal, then passes through narrow-band filtering
Device carries out frequency-selecting, and the odd-multiple phase shift of pi/2, branch intermediate-freuqncy signal under final output are then carried out by phase shifter.
9. the method that measurement microwave receiver according to claim 8 is mutually made an uproar, it is characterised in that: in step 1), phase shift
Signal afterwards also passes through adjustable amplifier 1 and amplifies, branch intermediate-freuqncy signal under final output.
10. the method that measurement microwave receiver according to claim 9 is mutually made an uproar, it is characterised in that: in the step 2), on
Branch intermediate-freuqncy signal and lower branch intermediate-freuqncy signal are mixed by frequency mixer 3, and output includes microwave receiver phase information
Baseband signal, the baseband signal again by low-pass filter carry out low-pass filtering after enter fourier analyzer in carry out frequency
Spectrum analysis finally obtains the value of mutually making an uproar of microwave receiver.
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| CN201811202765.8A CN109450566B (en) | 2018-10-16 | 2018-10-16 | Method and device for measuring phase noise of microwave receiver |
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| CN201811202765.8A CN109450566B (en) | 2018-10-16 | 2018-10-16 | Method and device for measuring phase noise of microwave receiver |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338658A (en) * | 2016-08-25 | 2017-01-18 | 南京航空航天大学 | Phase noise measurement method and device based on radio frequency cancellation |
| WO2018044500A1 (en) * | 2016-09-01 | 2018-03-08 | Imra America, Inc. | Ultra low noise photonic phase noise measurement system for microwave signal |
-
2018
- 2018-10-16 CN CN201811202765.8A patent/CN109450566B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338658A (en) * | 2016-08-25 | 2017-01-18 | 南京航空航天大学 | Phase noise measurement method and device based on radio frequency cancellation |
| WO2018044500A1 (en) * | 2016-09-01 | 2018-03-08 | Imra America, Inc. | Ultra low noise photonic phase noise measurement system for microwave signal |
Non-Patent Citations (3)
| Title |
|---|
| E VILAR等: "An experimental mm-wave receiver system for measuring phase noise due to atmospheric turbulence", 《1995 25TH EUROPEAN MICROWAVE CONFERENCE》 * |
| TERRY N. GUO: "Unique Measurement and Modeling of Total Phase Noise in RF Receiver", 《IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II: EXPRESS BRIEFS》 * |
| 洪俊等: "基于光延时的相位噪声测量系统研制", 《光电子·激光》 * |
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