CN106932659A - A kind of method of testing based on multichannel composite noise coefficient - Google Patents
A kind of method of testing based on multichannel composite noise coefficient Download PDFInfo
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- CN106932659A CN106932659A CN201710170359.7A CN201710170359A CN106932659A CN 106932659 A CN106932659 A CN 106932659A CN 201710170359 A CN201710170359 A CN 201710170359A CN 106932659 A CN106932659 A CN 106932659A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
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Abstract
The present invention relates to the testing field of wireless communication receiver system, more particularly to a kind of method of testing based on multichannel composite noise coefficient.The present invention is by special measuring method, phase, the amplitude of each passage in N channel unification reception system can cleverly be obtained, and by by the phase adjustment of each passage for identical, effectively prevent directly using noise coefficient instrument reception system is carried out composite noise measure when, what the phase difference of different passages was caused, signal is offset in whole or in part, so as to cause noise coefficient to deteriorate or inaccurate problem.
Description
Technical field
It is more particularly to a kind of to be based on multichannel composite noise system the present invention relates to the testing field of wireless communication receiver system
Several method of testings.
Background technology
Noise coefficient is a primary measured parameter in microwave product development and production process, be characterize receiver and its
Building block processes one of key parameter of small-signal ability in the presence of having thermal noise, thus noise coefficient height
Precision, high accuracy measuring method are very important.At present, the measuring method of single channel noise coefficient, is as shown in Figure 1 mostly
Directly tested with noise coefficient instrument, this metering system is of a relatively high to the test accuracy of single channel noise.
Multichannel synthesizes reception system because it synthesizes the advantages of big high gain, dynamic range and detection signal sensitivity high,
It is widely used in various communication products, is also the important component of phased array antenna, it needs also exist for carrying out noise survey
Examination, if tested multi-channel noise using such as single channel noise test identical method at that time, due to according to this
When method carries out noise calculation, the parameters such as gain, flatness, the phase of each passage are needed to be consistent completely in theory, and
The above-mentioned parameter of actually each passage is generally different, and then causes to enter multichannel using single pass above-mentioned method of testing
During row test, rough measure or theoretical calculation can only be carried out to the overall noise of multichannel synthesis system, and can not accurately surveyed
Measure the overall noise factor of whole system.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency in the presence of prior art, there is provided the present invention proposes a kind of base
In the method for testing of multichannel composite noise coefficient, high accuracy, the noise coefficient test result of high accuracy can be obtained.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
A kind of method of testing based on multichannel composite noise coefficient, including：
Unify N number of passage sending signal of reception system to N channel by one point of N power splitter, and detect that N channel unification is received
Each channel phases and the step of range value in system, N is more than 2 natural numbers；
Each channel phases is adjusted to consistent step during N channel is unified into reception system；
The step of direct detection N channel unification reception system composite noise coefficient.
Further, also including one point of N power splitters loss error of measurement the step of, unify in direct detection N channel and receive
After the step of system synthesis noise coefficient, the value of composite noise coefficient according to the loss error correction.
Further, detect in N channel unification reception system each channel phases and the step of range value in, measurement the
The method of n-channel phase and range value is as follows：
The overall initial amplitude a of measurement N channel unification reception system0With initial phase p0, z is expressed as in complex plane0=a0∠
p0, it is broken down into representing the vector z of the n-th passagen0=an0∠pn0With the vector z for representing other N-1 passage' n0=a' n0∠p' n0；
The phase of the n-th passage is increased by 180 °, the amplitude-phase of remaining N-1 passage keeps constant, measurement now N channel unification
The overall initial amplitude a of reception system1With initial phase p1, z is expressed as in complex plane1=a1∠p1；
Z will be used1With z0Subtracted each other, obtained z1 closes=2 zn0, so as to draw the amplitude and phase of the n-th passage, n be more than 1, N with
Under natural number.
Further, each channel phases is adjusted in consistent step in N channel being unified into reception system, can be with N
The phase of any passage is used as benchmark in individual passage, and the phase for adjusting other N-1 passage is same；Or,
The unification of N number of channel phases is adjusted to a desired value.
Further, each channel phases is adjusted in consistent step in N channel being unified into reception system, using numerical control
Phase shifter, analog phase shifter or the one kind increased in the modes such as transmission path enter horizontal phasing control.
Compared with prior art, beneficial effects of the present invention：The present invention can cleverly obtain N by special measuring method
Phase, the amplitude of each passage in passage unification reception system, and be identical by by the phase adjustment of each passage, it is prevented effectively from
When direct use noise coefficient instrument carries out to reception system composite noise and measures, what the phase difference of different passages was caused, letter
It is number all or part of to offset, so as to cause noise coefficient to deteriorate or inaccurate problem.
Brief description of the drawings：
Fig. 1 is reception system single channel noise coefficient test schematic diagram.
Fig. 2 is that N channel unifies reception system block diagram.
Fig. 3 is one point of N power splitter Insertion Loss error testing figure.
Fig. 4 is each channel phases detection figure of N channel unification reception system.
Fig. 5 is that the total amplitude-phase resolution of vectors of N channel unification reception system is the 1st channel amplitude phase and N- in complex plane
1 passage net amplitude phase schematic diagram.
Fig. 6 is that N channel unifies reception system noise coefficient test chart.
Marked in figure：1-N passages unify reception system, mono- point of N power splitter of 2-, 3- noise coefficient instrument, 4- vector networks point
Analyzer, 5- noise sources.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.But this should not be interpreted as this
The scope for inventing above-mentioned theme is only limitted to following embodiment, and all technologies realized based on present invention belong to the present invention
Scope.
This implementation provides what a kind of composite noise coefficient to N channel unification reception system 1 as shown in Figure 2 was tested
Method, N channel unification reception system 1 generally includes each receiving channels of N, and the All-in-One being connected with N number of receiving channel simultaneously
Power combiner；The method is specifically included：
Unify N number of passage sending signal of reception system 1 to N channel by one point of N power splitter 2, and detect that N channel unification connects
Each channel phases and the step of range value in receipts system 1, N is more than 2 natural numbers；
Each channel phases is adjusted to consistent step during N channel is unified into reception system 1；
The step of direct detection N channel unification 1 composite noise coefficient of reception system, specific detection mode is as shown in fig. 6, by noise
The output end of coefficient instrument 3 is connected by a noise source 5 with the input of one point of N power splitter 2, one point of N number of output of N power splitters 2
End is connected with the N number of passage in N channel unification reception system 1 respectively, and N channel unifies output end and the noise system of reception system 1
The measurement input connection of number instrument 3, noise coefficient is collectively referred to as using the acquisition N channel unification reception system 1 of noise coefficient instrument 3
mTest。
Also include the one point of loss error of N power splitters 2 L of measurement in this method0The step of, specifically, as shown in figure 3, will be suitable
Measure Network Analyzer output end be connected with the input of one point of N power splitter 2, one point of output end all the way of N power splitters 2 with it is appropriate
The measurement input connection of Network Analyzer, remaining N-1 road output terminating load；One point of N is tested using vector network analyzer 4
Being actually inserted into for power splitter 2 is lost LIt is actual, it is actually inserted into loss further according to this and subtracts theoretical insertion loss LIt is theoretical=10logN (dB),
So as to obtain L0, i.e. L0=it is actually inserted into loss-theory insertion loss LIt is theoretical；The unification synthesis of reception system 1 of direct detection N channel is made an uproar
After the step of sonic system number, according to loss error L0Correct the value of the composite noise coefficient, specially m=mTest-L0；mTestRepresent
The N channel that direct detection is obtained unifies the composite noise coefficient of reception system 1, and m represents revised composite noise coefficient.
In the present embodiment, by taking the phase, the amplitude that how to detect first passage as an example, how explanation detects that the N channel is unified
Each channel phases and range value in reception system 1, specific method are as follows：According to shown in Fig. 4 by the defeated of vector network analyzer 4
Go out end to be connected with the input of N power splitters 2 is divided one by one, one point of N number of output end of N power splitters 2 receives system with N channel unification respectively
N number of passage connection of system 1, N channel unifies the output end of reception system 1（The typically output end of All-in-One power combiner）With
The detection input connection of appropriate Network Analyzer.
Measurement N channel unifies the initial amplitude a of the entirety of reception system 10With initial phase p0, as shown in figure 5, in complex plane
Inside it is expressed as z0=a0∠p0, it is broken down into representing the vector z of the 1st passage10=a10∠p10With the arrow for representing other N-1 passage
Amount z' 10=a' 10∠p' 10；
The phase of the n-th passage is increased by 180 °, the amplitude-phase of remaining N-1 passage keeps constant, measurement now N channel unification
The initial amplitude a of the entirety of reception system 11With initial phase p1, z is expressed as in complex plane1=a1∠p1；
Z will be used1With z0Subtracted each other, obtained z1 closes=2 z10, specifically,
z1 closes= z1- z0= (z11+ z' 11)- (z10+ z' 10)
= [a10∠(p10+180°)+ z' 11)- (a10∠p10+ z' 10)]
=2 a10∠p10
=2 z10
So as to draw the amplitude and phase vectors z of the 1st passage10, n is more than 1, the natural number of below N.
Each channel phases is adjusted in consistent step during N channel is unified into reception system 1, under some implementation methods,
Can be with the phase of any passage in N number of passage（Such as the 1st channel phases）As benchmark, the phase of other N-1 passage is adjusted
It is same；Or,
The unification of N number of channel phases is adjusted to a desired value.And digital phase shifter can be used during specific adjustment phase place, simulation
Phase shifter or a kind of or other any adjustment phase places the mode increased in the modes such as transmission path are entered to each channel phases
Row adjustment, carrying out detection to it after each channel phases are identical can avoid because each channel phases is different, when causing synthesis, signal
It is all or part of to offset, deteriorate the problem of noise coefficient.
Claims (5)
1. a kind of method of testing based on multichannel composite noise coefficient, it is characterised in that including：
Unify N number of passage sending signal of reception system to N channel by one point of N power splitter, and detect that N channel unification is received
Each channel phases and the step of range value in system, N is more than 2 natural numbers；
Each channel phases is adjusted to consistent step during N channel is unified into reception system；
The step of direct detection N channel unification reception system composite noise coefficient.
2. method of testing as claimed in claim 1, it is characterised in that the step of error is also lost including one point of N power splitter of measurement
Suddenly, after the step of direct detection N channel unifies reception system composite noise coefficient, closed according to the loss error correction
Into the value of noise coefficient.
3. method of testing as claimed in claim 1, it is characterised in that detect each passage in N channel unification reception system
In the step of phase and range value, the method for the n-th channel phases of measurement and range value is as follows：
The overall initial amplitude a of measurement N channel unification reception system0With initial phase p0, z is expressed as in complex plane0=a0∠
p0, it is broken down into representing the vector z of the n-th passagen0=an0∠pn0With the vector z for representing other N-1 passage' n0=a' n0∠p' n0；
The phase of the n-th passage is increased by 180 °, the amplitude-phase of remaining N-1 passage keeps constant, measurement now N channel unification
The overall initial amplitude a of reception system1With initial phase p1, z is expressed as in complex plane1=a1∠p1；
Z will be used1With z0Subtracted each other, obtained z1 closes=2 zn0, so as to draw the amplitude and phase of the n-th passage, n is more than 1, below N
Natural number.
4. method of testing as claimed in claim 1, it is characterised in that N channel is unified into each channel phases in reception system
It is adjusted in consistent step, other N-1 passage can be adjusted using the phase of any passage in N number of passage as benchmark
Phase is same；Or,
The unification of N number of channel phases is adjusted to a desired value.
5. method of testing as claimed in claim 1, it is characterised in that N channel is unified into each channel phases in reception system
It is adjusted in consistent step, using digital phase shifter, analog phase shifter or the one kind increased in the modes such as transmission path are entered
Horizontal phasing control.
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