CN104734792B - Mix binary channels Attenuation measuring method and system - Google Patents
Mix binary channels Attenuation measuring method and system Download PDFInfo
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Abstract
The invention discloses mixing binary channels Attenuation measuring method and system, two single channel attenuation measurement systems based on AF substitution method principle are organically combined composition mixing binary channels Attenuation measuring system by the present invention, two passages share a signal source, signal source and local vibration source share a reference signal, two passages use different frequencys multiplication, when a passage is as Measurement channel, another passage is used as synchronizing channel, the intermediate frequency measurement signal of Measurement channel output has good correlation with the middle vertical synchronizing signal that synchronizing channel is exported, reduce the influence that phase noise and phase are floated slowly, measurement statistics uncertainty is small, and mutual cross-interference issue is not present in two passages in the system, expand decay range.
Description
Technical field
The present invention relates to attenuation measurement technical field, more particularly to a kind of mixing binary channels Attenuation measuring method and
System.
Background technology
The corresponding frequency range of millimeter wave is 50GHz~110GHz, in terms of satellite communication, radar, remote sensing remote measurement all
There is application widely.Millimeter wave frequency band be mainly characterized by short wavelength, it is wide frequency range, selective with Atmospheric components
Interaction, make it have that wave beam is narrow, capacity big, strong antijamming capability the advantages of.It can also expire while extending message capacity
The specific demand such as foot secrecy, anti-interference, therefore, millimeter-wave technology has obtained increasingly extensive application in military and civilian field,
And the demand for setting up the attenuation standard of millimeter wave each frequency range is also more and more urgent.
Decay is the basic parameter in Radio Measurements, is weakened which characterizes the amplitude of radio signal in transmitting procedure
Degree.In the systems such as radar, communication, navigation, the loss problem of power in the transmission will be considered and the spirit of signal is received
Sensitivity problem, thus need to carry out attenuation measurement and metering.In electronic instrument and electronic component, the development and production of device, decline
It is an important technical indicator to subtract.
Attenuation measurement has consequence in Radio Measurements, can provide approach of tracing to the source for power, S parameter etc..
In the metering for setting up power, noise criteria and other radio and microwave parameter, also often being determined by attenuation measurement technology has
The technical performance index of pass.
Attenuation measurement most common method is method of substitution, i.e., measure declining for measured piece by being compared with standard attenuator
Subtract.In method of substitution, intermediate frequency and ~+L.I.F. substitution method are that microwave or high-frequency signal are linearly transformed into fixation with conversion method
Intermediate frequency and low intermediate frequency signal, substitute tested attenuation with the attenuation of the degree of accuracy very high medium frequency standard attenuator.At present
The attenuation standard that majority state is set up is used as Low Medium Frequency standard attenuator using the inductive voltage divider that works in audio.
Single channel audio method of substitution is a kind of the more commonly used method in AF substitution method, is as shown in Figure 1 conventional one
The attenuation measurement device using single channel audio method of substitution is planted, general principle is as follows：
Microwave signal (the f of signal source output0) by the Measurement channel of tested attenuator (DUT), with local oscillation signal (f0+
10kHz) it is mixed, the signal spectrum exported by double balanced mixer is：10kHz, (3f0± 10kHz), (5f0±
10kHz) ..., the signal of frequency mixer output has filtered out higher-order wave, has only remained Low Medium Frequency 10kHz after low pass filter.
When the power level of local oscillation signal and measurement signal is suitable when higher than measurement signal (local oscillation signal 30dB more than), the Low Medium Frequency
The amplitude of signal and the amplitude of microwave measuring signals keep direct ratio linear relationship.When tested attenuator DUT attenuation change,
Make compensation change with inductive voltage divider in Low Medium Frequency, the output put in making is held essentially constant, by inductive voltage divider IVD change
The attenuation change amount of the tested attenuator of amount export.Wherein, the effect of lock-in amplifier is the phase sensitive detection for realizing narrow band detection, is
Narrow band detection is realized, lock-in amplifier needs synchronizing signal essentially equal with measured signal frequency, in single channel
In Low Medium Frequency train, by 1000 times of the reference clock 10MHz signal frequency splits of signal source, obtain 10kHz and amplify as locking
The synchronizing signal of device.Meanwhile, local vibration source is also locked on the reference source of signal source, therefore intermediate-freuqncy signal and middle vertical synchronizing signal phase
Deng being all 10kHz.
One problem of single channel audio method of substitution is：The signal that signal source is produced is to be based on phaselocked loop, frequency multiplier/frequency dividing
The microwave signal that device is obtained.During quiescent operation point drift inside phase-locked loop circuit, the phase of output signal of phaselocked loop just with
Change, that is to say, that signal source is not perfectly correlated with local vibration source output signal, and this results in intermediate frequency measurement signal and intermediate frequency
Synchronous signal frequency can not be essentially equal.The adverse effect that this phenomenon is produced is with the increase of frequency, all the more substantially.
Another problem of single channel audio method of substitution is phase noise problems.The phase noise of one microwave signal comes from
In 10MHz with reference to and frequency synthesizer circuit based on phaselocked loop, for the phase noise referred to from 10MHz, signal source and
Local vibration source output phase noise be it is related, intermediate frequency measurement signal phase noise can offseting signal source and local vibration source output phase
Position noise；For the phase noise from the frequency synthesizer circuit based on phaselocked loop, signal source and local vibration source output phase noise
It is completely unrelated, intermediate frequency measurement signal phase noise is the synthesis of the phase noise of signal source and local vibration source output.This portion
The phase noise divided increases with the increase of microwave signal frequency.
Above-mentioned two problems can all influence the statistics uncertainty of attenuation measurement.
The content of the invention
In view of this, present invention aims at a kind of mixing binary channels Attenuation measuring method and system is provided, use
It is not completely equivalent and phase noise with intermediate frequency synchronous signal frequency in solving intermediate frequency measurement signal in single channel audio method of substitution
Etc. technical problem.
Based on the embodiment of the present invention, binary channels Attenuation measuring method, this method are mixed the invention provides one kind
Applied in the Attenuation measuring system including two passages, this method includes：
First passage and second channel share same signal source, and local vibration source produces this based on the reference signal that signal source is exported
Shake signal；
After the millimeter-wave signal of signal source output does M frequencys multiplication through the first frequency multiplier, through the first tested attenuator decay, decay
After signal afterwards is mixed with the local oscillation signal through M frequencys multiplication through the first frequency mixer, the intermediate-freuqncy signal IF1 of first passage is exported；Signal
After the millimeter-wave signal of source output does N frequencys multiplication through the second frequency multiplier, through the second tested attenuator decay, signal and warp after decay
After the local oscillation signal of N frequencys multiplication is mixed through the second frequency mixer, the intermediate-freuqncy signal IF2 of second channel is exported；Wherein M, N be more than or equal to
1 natural number, and M is not equal to N；
When a passage in two described passages is as Measurement channel, another passage is used as the Measurement channel
Synchronizing channel, is input to the input of inductive voltage divider after the filtered amplification of intermediate-freuqncy signal of Measurement channel, inductive voltage divider
Output signal is input to one input of lock-in amplifier；It is input to after the filtered amplification of intermediate-freuqncy signal of synchronizing channel synchronous logical
The frequency synthesizer in road, the signal of the frequency synthesizer output of synchronizing channel is input to another input of lock-in amplifier；Its
In, the frequency synthesizer of synchronizing channel is used to being adjusted to the IF signal frequency of synchronizing channel into the intermediate-freuqncy signal with Measurement channel
Frequency it is identical.
Further, when first passage is as Measurement channel, the intermediate-freuqncy signal IF1 of first passage is filtered through the first amplification
Device amplification filtering, output signal is input to the input of inductive voltage divider；The intermediate-freuqncy signal IF2 of second channel is filtered through the second amplification
Output signal is input to second frequency synthesizer after the amplification filtering of ripple device, second frequency synthesizer is to input signal progress × M
Synchronizing signal SYNC is exported after ÷ N frequency modulation processing, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Sensing
The output end of divider and the signal input part of lock-in amplifier are connected.
Further, when second channel is as Measurement channel, the intermediate-freuqncy signal IF2 of second channel is filtered through the second amplification
Device amplifies the input that filtered output signal is input to inductive voltage divider；The intermediate-freuqncy signal IF1 of first passage is put through first
Signal is output it after big wave filter amplification filtering and is input to first frequency synthesizer, and first frequency synthesizer enters to input signal
Synchronizing signal SYNC is exported after row × N ÷ M frequency modulation, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Sense
The output end of divider and another input of lock-in amplifier is answered to connect.
Further, by multiple switch circuit cooperate realize first passage and second channel be used as Measurement channel and
The switching of synchronizing channel；, successively will sensing by the cooperation of the multiple on-off circuit when first passage is as Measurement channel
Divider, lock-in amplifier and the frequency synthesizer as the second channel of synchronizing channel are serially connected in the amplification filtering of first passage
Between device and the amplifilter of second channel；When second channel is as Measurement channel, pass through the multiple on-off circuit
Coordinate, the frequency synthesizer of the first passage using inductive voltage divider, lock-in amplifier and as synchronizing channel is serially connected in the successively
Between the amplifilter of two passages and the amplifilter of first passage.
Further, isolator and tuner are concatenated between first frequency multiplier and the described first tested attenuator,
It is tested first and concatenates tuner and isolator between attenuator and the first frequency mixer；It is tested in second frequency multiplier and second
Isolator and tuner are concatenated between attenuator, tested tuner is concatenated between attenuator and the second frequency mixer and isolate second
Device.
Based on the embodiment of the present invention, the present invention also provides a kind of mixing binary channels Attenuation measuring system, the system
Including first passage and second channel, first passage and second channel share same signal source, and local vibration source is exported based on signal source
Reference signal produce local oscillation signal；
In first passage, the first frequency multiplier, first are sequentially connected in series between signal source and an input of the first frequency mixer
Tested attenuator, concatenates frequency tripler, the output of the first frequency mixer between another input of the local vibration source with the first frequency mixer
The intermediate-freuqncy signal IF1 of first passage, first frequency multiplier and frequency tripler are used to do input signal M frequencys multiplication；Wherein M is
Natural number more than or equal to 1；
In second channel, the second frequency multiplier, second are sequentially connected in series between signal source and an input of the second frequency mixer
Tested attenuator, concatenates quadrupler, the output of the second frequency mixer between another input of the local vibration source with the second frequency mixer
The intermediate-freuqncy signal IF2 of second channel, second frequency multiplier and quadrupler are used to do input signal N frequencys multiplication；Wherein N is
Natural number more than or equal to 1, and M is not equal to N；
When a passage in two described passages is as Measurement channel, another passage is used as the Measurement channel
Synchronizing channel, is input to the input of inductive voltage divider after the filtered amplification of intermediate-freuqncy signal of Measurement channel, inductive voltage divider
Output signal is input to one input of lock-in amplifier；It is input to after the filtered amplification of intermediate-freuqncy signal of synchronizing channel synchronous logical
The frequency synthesizer in road, the signal of the frequency synthesizer output of synchronizing channel is input to another input of lock-in amplifier；Its
In, the frequency synthesizer of synchronizing channel is used to being adjusted to the IF signal frequency of synchronizing channel into the intermediate-freuqncy signal with Measurement channel
Frequency it is identical.
Further, when first passage is as Measurement channel, the intermediate-freuqncy signal IF1 of first passage is filtered through the first amplification
Device amplification filtering, output signal is input to the input of inductive voltage divider；The intermediate-freuqncy signal IF2 of second channel is filtered through the second amplification
Output signal is input to second frequency synthesizer after the amplification filtering of ripple device, second frequency synthesizer is to input signal progress × M
Synchronizing signal SYNC is exported after ÷ N frequency modulation processing, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Sensing
The output end of divider and the signal input part of lock-in amplifier are connected.
Further, when second channel is as Measurement channel, the intermediate-freuqncy signal IF2 of second channel is filtered through the second amplification
Device amplifies the input that filtered output signal is input to inductive voltage divider；The intermediate-freuqncy signal IF1 of first passage is put through first
Signal is output it after big wave filter amplification filtering and is input to first frequency synthesizer, and first frequency synthesizer enters to input signal
Synchronizing signal SYNC is exported after row × N ÷ M frequency modulation, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Sense
The output end of divider and another input of lock-in amplifier is answered to connect.
Further, the system also includes multiple switch circuit, and the plurality of on-off circuit cooperates and realizes first passage
With switching of the second channel as Measurement channel and synchronizing channel；
When first passage is as Measurement channel, by the cooperation of the multiple on-off circuit, successively by inductive voltage divider,
Lock-in amplifier and it is serially connected in the amplifilter and of first passage as the frequency synthesizer of the second channel of synchronizing channel
Between the amplifilter of two passages；
When second channel is as Measurement channel, by the cooperation of the multiple on-off circuit, successively by inductive voltage divider,
Lock-in amplifier and it is serially connected in the amplifilter and of second channel as the frequency synthesizer of the first passage of synchronizing channel
Between the amplifilter of one passage.
Further, isolator and allotment are also serially connected between first frequency multiplier and the first tested attenuator
Device, is tested first and concatenates tuner and isolator between attenuator and the first frequency mixer；
Isolator and tuner are also serially connected between second frequency multiplier and the second tested attenuator, second
It is tested to concatenate tuner and isolator between attenuator and the second frequency mixer.
Two single channel attenuation measurement systems based on AF substitution method principle are organically combined structure by the present invention
Into mixing binary channels Attenuation measuring system, two passages share a signal source, and signal source and local vibration source share one
Reference signal, two passages use different frequencys multiplication, when a passage is as Measurement channel, and another passage is as synchronous logical
Road, the intermediate frequency measurement signal of Measurement channel output has good correlation with the middle vertical synchronizing signal that synchronizing channel is exported, and subtracts
The influence that small phase noise and phase are floated slowly, measurement statistics uncertainty is small, and two passages in the system are not present
Mutual cross-interference issue, expands decay range.
Brief description of the drawings
Fig. 1 is a kind of existing attenuation measurement device structural representation of use single channel audio method of substitution；
Fig. 2 is a kind of circuit structure design for mixing binary channels Attenuation measuring system provided in an embodiment of the present invention
Schematic diagram；
Fig. 3 is a kind of structural representation for mixing binary channels Attenuation measuring system provided in an embodiment of the present invention.
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
Whole description, 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 all 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.It should be noted that in the case where not conflicting, the embodiment of the present invention and reality
Applying the feature in example can be mutually combined.
The embodiment of the present invention creatively measures two Attenuations using single channel audio method of substitution principle
System combines a kind of mixing binary channels Attenuation measuring system of composition, within the system, when a passage is used as survey
When measuring passage, another intermediate frequency measurement signal exported as synchronizing channel, two passages and middle vertical synchronizing signal have frequency
Correlation, so as to solve in single channel audio method of substitution that intermediate frequency measurement signal and intermediate frequency synchronous signal frequency can not be essentially equal
Technical problem.Fig. 2 sets for a kind of circuit structure for mixing binary channels Attenuation measuring system provided in an embodiment of the present invention
Schematic diagram is counted, with reference to Fig. 2 to a kind of step for mixing binary channels Attenuation measuring method provided in an embodiment of the present invention
Rapid flow is described in detail.
Step 301, first passage and second channel share same signal source, the reference letter that local vibration source is exported based on signal source
Number produce local oscillation signal；
The system includes first passage and second channel, by taking Fig. 2 as an example, if first passage is the first tested attenuator DUT1
Passage where (Device Under Test, DUT), second channel is the passage where the second tested attenuator DUT2, first
Passage and second channel share same mm-wave signal source (Millimeter Wave Source, MMVS, hereinafter referred to as signal
Source).
In order that intermediate frequency measurement signal and middle vertical synchronizing signal that two passages are exported respectively have frequency dependence, this hair
Mm-wave signal source and millimeter wave local vibration source in bright embodiment (Millimeter Wave Local Oscillator, MMVLO,
Hereinafter referred to as local vibration source) share same reference signal.As shown in Fig. 2 providing reference signal by signal source MMVS for local vibration source.
After step 302, the millimeter-wave signal of signal source output do M frequencys multiplication through the first frequency multiplier, through the first tested attenuator
Decay, the signal after decay is mixed with the local oscillation signal through M frequencys multiplication, exports the intermediate-freuqncy signal IF1 of first passage；Signal source is exported
Millimeter-wave signal do N frequencys multiplication through the second frequency multiplier after, through the second tested attenuator decay, signal after decay with through N frequencys multiplication
Local oscillation signal mixing, export second channel intermediate-freuqncy signal IF2；
The millimeter-wave signal f of signal source output0(t) it is M through the first frequency multiplier FM1 (M is natural number more than or equal to 1, M
Be not equal to N) times frequency conversion after export f0-1(t), f0-1(t) it is input to the first frequency mixer after the first tested attenuator DUT1 decay
Mixer1.Local vibration source is locked in the reference signal f of signal sourceref, output local oscillation signal fL(t), local oscillation signal is through frequency tripler
FM3 exports f after doing M times of frequency conversionL-1(t),fL-1And f (t)0-1(t) signal exports first after the first frequency mixer Mixer1 mixing
The intermediate-freuqncy signal IF1 of passage；
Meanwhile, the millimeter-wave signal f of signal source output0(t) it is N through the second frequency multiplier FM2 (N is nature more than or equal to 1
Number) times frequency conversion after export f0-2(t), f0-2(t) it is input to the second frequency mixer Mixer2 after tested attenuator DUT2.Local oscillator is believed
Number fL(t) quadrupler FM4 exports f after doing N frequencys multiplicationL-2(t),fL-2And f (t)0-2(t) signal is in the second frequency mixer Mixer2
The intermediate-freuqncy signal IF2 of second channel is exported after mixing；
When a passage in step 303, two passages is as Measurement channel, another passage is used as the Measurement channel
Synchronizing channel, is input to the input of inductive voltage divider after the filtered amplification of intermediate-freuqncy signal of Measurement channel, inductive voltage divider
Output signal is input to one input of lock-in amplifier；It is input to after the filtered amplification of intermediate-freuqncy signal of synchronizing channel synchronous logical
The frequency synthesizer in road, the signal of the frequency synthesizer output of synchronizing channel is input to another input of lock-in amplifier；Its
In, the frequency synthesizer of synchronizing channel is used to being adjusted to the IF signal frequency of synchronizing channel into the intermediate-freuqncy signal with Measurement channel
Frequency it is identical.
In the embodiment of the present invention, first passage and second channel synchronizing channel each other, i.e., when first passage is Measurement channel
When, second channel is as the synchronizing channel of first passage, and vice versa.When a passage is as Measurement channel, the passage
Tested attenuator is tested attenuator, when the passage is as synchronizing channel, the tested attenuator of the passage for actual access
Input/output interface is adjusted to minimum range by short circuit or by the tested attenuator.
Fig. 2 examples are refer to, when first passage is as Measurement channel, by the intermediate-freuqncy signal IF1 of first passage through first
Output signal is input to the input of inductive voltage divider after amplifilter AF1 amplification filtering；The intermediate frequency of second channel is believed
Output signal is input to second frequency synthesizer FR2, second frequency by number IF2 after the second amplifilter AF2 amplification filtering
Synthesizer FR2 is input to locking to exporting synchronizing signal SYNC, synchronizing signal SYNC after input signal progress × M ÷ N processing
Amplifier LA synchronizing signal end；Inductive voltage divider IVD output end is connected with lock-in amplifier LA signal input part.
Further, the present invention passes through the mutual of first switch S1, second switch S2, the 3rd switch S3 and the 4th switch S4
Routing is coordinated to realize first passage and second channel as the switching of Measurement channel and synchronizing channel, so as to realize logical first
Road as Measurement channel second channel as synchronizing channel when, by inductive voltage divider (Induction Voltage Divider,
IVD), lock-in amplifier LA and second frequency synthesizer FR2 are sequentially connected in series between AF1 and AF2；Measurement is used as in second channel
When passage first passage is as synchronizing channel, IVD, LA and FR1 are sequentially connected in series between AF2 and AF1.
In this case step correspondence first passage is needed by controlling S1 to S4 tetra- to open as situation during Measurement channel
Do following circuit switching in pass：The intermediate-freuqncy signal IF1 of the first passage exported after mixed is input to first as measurement signal
Amplifilter AF1 input, is carried out after low noise amplification in advance and filtering, the signal of AF1 outputs is with first switch S1's
One end connect, first switch S1 be variable connector, in addition two ends respectively with first frequency synthesizer FR1 and inductive voltage divider IVD
Connection.The input of AF1 output end and IVD is connected by first switch S1, the connection between AF1 and FR1 is disconnected.
Meanwhile, AF2 output end is connected with second frequency synthesizer FR2 input by second switch S2, AF2 and IVD is disconnected
Between connection, and by the 4th switch S4 closure the circuit between second frequency synthesizer FR2 and lock-in amplifier LA is connect
It is logical, the circuit between first frequency synthesizer FR1 and lock-in amplifier LA is disconnected by the 3rd switch S3 open circuits.
Second frequency synthesizer FR2 is used for the frequency modulation to the second amplifilter AF2 signal progress × M ÷ N exported, its
Synchronizing signal as the measurement signal of first passage is input to lock-in amplifier LA by output.
Fig. 2 examples are refer to, when second channel is as Measurement channel, by the intermediate-freuqncy signal IF2 of second channel through second
Output signal is input to the input of inductive voltage divider after amplifilter AF2 amplification filtering；The intermediate frequency of first passage is believed
Number IF1 outputs it signal after the first amplifilter AF1 amplification filtering and is input to first frequency synthesizer FR1, the first frequency
Rate synthesizer FR1 is input to lock to exporting synchronizing signal SYNC, synchronizing signal SYNC after input signal progress × N ÷ M frequency modulation
Determine amplifier LA synchronizing signal end；Inductive voltage divider IVD output end is connected with lock-in amplifier LA another input.
In this case step correspondence first passage is needed by controlling tetra- switches of S1 to S4 as situation during Measurement channel
Do following circuit switching：The intermediate-freuqncy signal IF2 of the second channel exported after mixed is input to the second amplifilter AF2,
Carry out after low noise amplification in advance and filtering, the signal of AF2 outputs is connected with second switch S2 one end, and second switch S2 is many
Way switch, in addition two ends be connected respectively with second frequency synthesizer FR2 and inductive voltage divider IVD.By second switch S2 by AF2
Output end and IVD input connect, disconnect the connection between AF2 and FR2.Meanwhile, by first switch S1 by AF1
Output end be connected with first frequency synthesizer FR1 input, disconnect AF1 and IVD between connection, and pass through the 3rd switch
S3 closures connect the circuit between first frequency synthesizer FR1 and lock-in amplifier LA, by the 4th switch S4 open circuits by the
Circuit between two frequency synthesizer FR2 and lock-in amplifier LA disconnects.
First frequency synthesizer FR1 is used for the frequency modulation to the first amplifilter AF1 signal progress × N ÷ M exported, its
Synchronizing signal as the measurement signal of second channel is input to lock-in amplifier LA by output.
In an alternative embodiment of the invention, Fig. 3 is refer to, in order to improve the precision and accuracy of measurement, also at first times
Concatenate isolator and tuner between the tested attenuator DUT1 of frequency device FM1 and first, and in the first tested attenuator DUT1 and
Tuner and isolator are concatenated between first frequency mixer Mixer1, wherein, the effect of isolator and tuner is regulation test lead
The reflectance factor of mouth, makes it small as far as possible.Correspondingly, gone here and there between the second frequency multiplier FM2 and second is tested attenuator DUT2
Connect isolator and tuner, and second it is tested concatenated between attenuator DUT2 and the second frequency mixer Mixer2 tuner and every
From device.
Below in conjunction with Fig. 3, technical solution of the present invention and technique effect are illustrated with instantiation.
Fig. 3 is the mixing binary channels designed based on foregoing mixing binary channels Attenuation measuring method and system principle
Attenuation measuring system, the system comprising 50GHz-75GHz (W-waveband, waveguide WR15) and 75GHz-110GHz (V-band,
Waveguide WR10) two Measurement channels.When tested attenuator is WR15 attenuators, WR15 passages lead to as Measurement channel, WR10
Road is as synchronizing channel；When measuring WR10 attenuators, WR10 passages are as Measurement channel, and WR15 passages are as synchronous logical
Road.
When measuring WR15 attenuators, signal source exports 25GHz-37.5GHz signal, and 50GHz- is produced by 2 frequencys multiplication
75GHz millimeter-wave signals are input to the input that WR15 is tested attenuator by isolator and tuner, and WR15 is tested attenuator
Output end output the formulated device of signal and isolator be input to the mixer inputs of WR15 passages, local vibration source output
25.000005GHz-37.500005GHz signals, 50.00001GHz-75.00001GHz millimeter-wave signals are produced by 2 frequencys multiplication
Another input of the frequency mixer of WR15 passages is input to, 10kHz intermediate-freuqncy signals are exported after the frequency mixer mixing of WR15 passages.Together
When, in WR10 passages, the signal of signal source output passes through 3 frequencys multiplication, produces 75GHz-112.5GHz millimeter-wave signals by passing through
Isolator and tuner are input to the input that WR10 is tested attenuator, and WR15 is tested the signal warp of the output end output of attenuator
Tuner and isolator are input to the mixer input of WR10 passages, and local vibration source also passes through 3 frequencys multiplication and produces 75.000015GHz-
112.000015GHz millimeter-wave signals are input to another input of the frequency mixer of WR10 passages, and the frequency mixer of WR10 passages is mixed
Frequency output 15kHz intermediate-freuqncy signals, the signal process × circuits of 2 ÷ 3 just obtain the intermediate frequency measurement signal frequency phase with WR15 passages
Vertical synchronizing signal in same 10kHz.
Similarly, when measuring WR10 attenuators, microwave signal source exports 25GHz-36.66666666666GHz signal,
WR10 is input to by isolator and tuner be tested the defeated of attenuator by 3 frequencys multiplication generation 75GHz-110GHz millimeter-wave signals
Enter end, the frequency mixer that the formulated device of signal and isolator that the output end that WR10 is tested attenuator is exported are input to WR10 passages is defeated
Enter end, local oscillator microwave source output 25.0000033333GHz-36.666669999999GHz signals are produced by 3 frequencys multiplication
75.00001GHz-110.00001GHz millimeter-wave signal be input to WR10 passages frequency mixer another input, WR10 lead to
10kHz intermediate frequency measurement signals are exported after the frequency mixer mixing in road.Meanwhile, in WR15 passages, the signal of signal source output passes through 2 times
Frequently, 50GHz-73.33333GHz millimeter-wave signals are produced, the signal of local vibration source output also passes through the generation of 2 frequencys multiplication
50.000006667GHz-73.333336667GHz millimeter-wave signal, is exported after the frequency mixer mixing through WR15 passages
6.6667kHz signals, the signal process × circuits of 3 ÷ 2 just obtain the intermediate frequency measurement signal frequency identical with WR10 passages
Vertical synchronizing signal in 10kHz.
The Attenuation measuring system realized based on the embodiment of the present invention can eliminate single channel audio method of substitution and realize
Attenuation measurement system intermediate frequency net synchronization capability it is poor the problem of, and two passages will not produce cross-interference issue.Below in conjunction with the implementation
Example carries out detailed analytic explanation：
(1) frequency dependence of intermediate frequency measurement signal and middle vertical synchronizing signal
In the mixing binary channels Attenuation measuring system that the embodiment is provided, two mm-wave signal source (signals
Source and local vibration source) share same 10MHz reference signal, if signal source and local vibration source output signal be respectively：
In formula, ω0It is signal source output angular frequency,It is the phase noise of signal source output signal,It is local oscillator
The phase noise of source output signal, local oscillation signal angular frequency is ω0+ωIF.Signal is through 2 and 3 frequencys multiplication, feed-in V-band signalling channel
With W-waveband signalling channel, it is：
In formula, θs-VAnd θ (t)s-W(t) it is that frequency-doubled signal is derived from the phase noise that body is produced, equally, two frequency multiplication local oscillator letters
Number be respectively：
In formula, θL-VAnd θ (t)L-W(t) be frequency multiplication local vibration source itself produce phase noise.After mixed, two intermediate frequency letters
Number be respectively：
When measuring WR15 attenuators, fIF-W(t) synchronized circuit working frequency × 2 ÷ 3 handle after, two intermediate-freuqncy signals
For：
After simplification, it is：
In formula,θV(t)=θL-V(t)-θs-V(t), θW(t)=2/3 [(θL-W(t)-θs-W(t)]。
Lock-in amplifier realizes narrow-band demodulation with two signal multiplications, if fIF-W(t) it is synchronizing signal, UIF-W=1, lock-in amplifier is defeated
Go out, be：
Wherein θVAnd θWMultiply the effective bandwidth (0.1Hz or 0.03Hz) of reception, V for the phase noise of the 10kHz sidebands of carrier wave
Phase noise with the signal of W-waveband and the 10kHz sidebands of local oscillator is about 90dBc or so, therefore by θVAnd θWThe measurement of introducing is missed
Difference is one a small amount of.Due to θVAnd θWIt is one a small amount of, fIF-WAnd f (t)IF-(t) have good correlation.
When measuring WR10 attenuators, fIF-V(t) synchronized circuit working frequency × 3 ÷ 2 handle, can obtain identical point
Analyse result.
(2) binary channels cross-interference issue
Because the signal and local oscillation signal of WR15 passages distinguish 2 ω0With 2 ω0+2ωIF, in the signal of WR10 passages and this
The signal that shakes distinguishes 3 ω0With 3 ω0+3ωIF, the signal difference of two passages, when two channel signal crosstalks, synchronizing channel production
The frequency for the measured signal that raw intermediate-freuqncy signal is produced with Measurement channel is entirely different, therefore does not interfere with measurement result.When again
When there are other harmonic components in frequency source, it will not also produce and IF signal frequency identical crosstalk signal.Therefore mixing binary channels declines
Subtract measuring system in the absence of cross-interference issue, isolator need not be also inserted in local oscillator branch road.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (10)
1. mix binary channels Attenuation measuring method, it is characterised in that this method is applied to include the millimeter of two passages
In wave attenuation measuring system, this method includes：
First passage and second channel share same signal source, and local vibration source produces local oscillator letter based on the reference signal that signal source is exported
Number；
After the millimeter-wave signal of signal source output does M frequencys multiplication through the first frequency multiplier, through the first tested attenuator decay, after decay
After signal is mixed with the local oscillation signal through M frequencys multiplication through the first frequency mixer, the intermediate-freuqncy signal IF1 of first passage is exported；Signal source is defeated
After the millimeter-wave signal gone out does N frequencys multiplication through the second frequency multiplier, through the second tested attenuator decay, signal after decay with through N times
After the local oscillation signal of frequency is mixed through the second frequency mixer, the intermediate-freuqncy signal IF2 of second channel is exported；Wherein M, N are more than or equal to 1
Natural number, and M is not equal to N；
When a passage in two described passages is as Measurement channel, another passage as the Measurement channel synchronization
Passage, is input to the input of inductive voltage divider, the output of inductive voltage divider after the filtered amplification of intermediate-freuqncy signal of Measurement channel
Signal is input to one input of lock-in amplifier；Synchronizing channel is input to after the filtered amplification of intermediate-freuqncy signal of synchronizing channel
Frequency synthesizer, the output signal of the frequency synthesizer of synchronizing channel is input to another input of lock-in amplifier；Wherein, together
The frequency synthesizer of step passage is used to being adjusted to the IF signal frequency of synchronizing channel into the frequency with the intermediate-freuqncy signal of Measurement channel
Rate is identical.
2. according to the method described in claim 1, it is characterised in that
When first passage is as Measurement channel, the intermediate-freuqncy signal IF1 of first passage is after the amplification filtering of the first amplifilter
Output signal be input to the input of inductive voltage divider；The intermediate-freuqncy signal IF2 of second channel amplifies through the second amplifilter
Output signal is input to second frequency synthesizer, frequency modulation of the second frequency synthesizer to input signal progress × M ÷ N after filtering
Synchronizing signal SYNC is exported after processing, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Inductive voltage divider
The signal input part connection of output end and lock-in amplifier.
3. according to the method described in claim 1, it is characterised in that
When second channel is as Measurement channel, the intermediate-freuqncy signal IF2 of second channel is after the amplification filtering of the second amplifilter
Output signal be input to the input of inductive voltage divider；The intermediate-freuqncy signal IF1 of first passage amplifies through the first amplifilter
Signal is output it after filtering and is input to first frequency synthesizer, tune of the first frequency synthesizer to input signal progress × N ÷ M
Synchronizing signal SYNC is exported after frequency, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Inductive voltage divider it is defeated
Go out end to be connected with the signal input part of lock-in amplifier.
4. the method according to any one of claims 1 to 3, it is characterised in that cooperated by multiple switch circuit real
Show first passage and second channel as the switching of Measurement channel and synchronizing channel；
When first passage is as Measurement channel, by the cooperation of the multiple on-off circuit, successively by inductive voltage divider, locking
Amplifier and it is serially connected in the amplifilter of first passage and second logical as the frequency synthesizer of the second channel of synchronizing channel
Between the amplifilter in road；
When second channel is as Measurement channel, by the cooperation of the multiple on-off circuit, successively by inductive voltage divider, locking
Amplifier and it is serially connected in the amplifilter of second channel and first logical as the frequency synthesizer of the first passage of synchronizing channel
Between the amplifilter in road.
5. according to the method described in claim 1, it is characterised in that
Isolator and tuner are concatenated between first frequency multiplier and the described first tested attenuator, in the first tested decay
Tuner and isolator are concatenated between device and the first frequency mixer；
Concatenate isolator and tuner between second frequency multiplier and the second tested attenuator, in the second tested attenuator and
Tuner and isolator are concatenated between second frequency mixer.
6. mix binary channels Attenuation measuring system, it is characterised in that the system includes first passage and second channel, the
One passage and second channel share same signal source, and local vibration source produces local oscillation signal based on the reference signal that signal source is exported；
In first passage, be sequentially connected in series between signal source and an input of the first frequency mixer the first frequency multiplier, first be tested
Attenuator, concatenates frequency tripler, the first frequency mixer output first between another input of the local vibration source with the first frequency mixer
The intermediate-freuqncy signal IF1 of passage, first frequency multiplier and frequency tripler are used to do input signal M frequencys multiplication；Wherein M be more than
Natural number equal to 1；
In second channel, be sequentially connected in series between signal source and an input of the second frequency mixer the second frequency multiplier, second be tested
Attenuator, concatenates quadrupler, the second frequency mixer output second between another input of the local vibration source with the second frequency mixer
The intermediate-freuqncy signal IF2 of passage, second frequency multiplier and quadrupler are used to do input signal N frequencys multiplication；Wherein N be more than
Natural number equal to 1, and M is not equal to N；
When a passage in two passages is as Measurement channel, another passage as the Measurement channel synchronizing channel,
The input of inductive voltage divider is input to after the filtered amplification of intermediate-freuqncy signal of Measurement channel, the output signal of inductive voltage divider is defeated
Enter to one input of lock-in amplifier；The frequency that synchronizing channel is input to after the filtered amplification of intermediate-freuqncy signal of synchronizing channel is closed
Grow up to be a useful person, the output signal of the frequency synthesizer of synchronizing channel is input to another input of lock-in amplifier；Wherein, synchronizing channel
Frequency synthesizer be used for the IF signal frequency of synchronizing channel is adjusted to identical with the frequency of the intermediate-freuqncy signal of Measurement channel.
7. system according to claim 6, it is characterised in that
When first passage is as Measurement channel, the intermediate-freuqncy signal IF1 of first passage is after the amplification filtering of the first amplifilter
Output signal be input to the input of inductive voltage divider；The intermediate-freuqncy signal IF2 of second channel amplifies through the second amplifilter
Output signal is input to second frequency synthesizer, frequency modulation of the second frequency synthesizer to input signal progress × M ÷ N after filtering
Synchronizing signal SYNC is exported after processing, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Inductive voltage divider
The signal input part connection of output end and lock-in amplifier.
8. system according to claim 6, it is characterised in that
When second channel is as Measurement channel, the intermediate-freuqncy signal IF2 of second channel is after the amplification filtering of the second amplifilter
Output signal be input to the input of inductive voltage divider；The intermediate-freuqncy signal IF1 of first passage amplifies through the first amplifilter
Signal is output it after filtering and is input to first frequency synthesizer, tune of the first frequency synthesizer to input signal progress × N ÷ M
Synchronizing signal SYNC is exported after frequency, synchronizing signal SYNC is input to the synchronizing signal end of lock-in amplifier；Inductive voltage divider it is defeated
Go out end to be connected with the signal input part of lock-in amplifier.
9. the system according to any one of claim 6 to 8, it is characterised in that the system also includes multiple switch circuit, should
Multiple switch circuit, which cooperates, realizes first passage and second channel as the switching of Measurement channel and synchronizing channel；
When first passage is as Measurement channel, by the cooperation of the multiple on-off circuit, successively by inductive voltage divider, locking
Amplifier and it is serially connected in the amplifilter of first passage and second logical as the frequency synthesizer of the second channel of synchronizing channel
Between the amplifilter in road；
When second channel is as Measurement channel, by the cooperation of the multiple on-off circuit, successively by inductive voltage divider, locking
Amplifier and it is serially connected in the amplifilter of second channel and first logical as the frequency synthesizer of the first passage of synchronizing channel
Between the amplifilter in road.
10. system according to claim 6, it is characterised in that
Isolator and tuner are also serially connected between first frequency multiplier and the first tested attenuator, it is tested first
Tuner and isolator are concatenated between attenuator and the first frequency mixer；
Isolator and tuner are also serially connected between second frequency multiplier and the second tested attenuator, it is tested second
Tuner and isolator are concatenated between attenuator and the second frequency mixer.
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| CN107643450B (en) * | 2017-08-31 | 2019-11-26 | 中国计量科学研究院 | The measurement method and measuring system of low damage dielectric materials |
| CN109617633B (en) * | 2018-12-19 | 2021-05-07 | 北京无线电计量测试研究所 | Millimeter wave attenuation measurement system and method |
| CN110190815A (en) * | 2019-05-28 | 2019-08-30 | 南京国立电子科技有限公司 | A kind of millimeter wave Phase amplitude-matched binary channels down conversion components |
| CN110336537B (en) * | 2019-06-21 | 2023-04-07 | 西安天和防务技术股份有限公司 | Multi-frequency point control circuit |
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