CN106483437A - A kind of travelling-wave tubes gain compression characteristics method for automatic measurement - Google Patents
A kind of travelling-wave tubes gain compression characteristics method for automatic measurement Download PDFInfo
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- CN106483437A CN106483437A CN201610816382.4A CN201610816382A CN106483437A CN 106483437 A CN106483437 A CN 106483437A CN 201610816382 A CN201610816382 A CN 201610816382A CN 106483437 A CN106483437 A CN 106483437A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/24—Testing of discharge tubes
- G01R31/25—Testing of vacuum tubes
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Abstract
The invention belongs to automatic test technology field, provides a kind of travelling-wave tubes gain compression characteristics method for automatic measurement, in order to solve the problems, such as that measure error is big in existing measuring method, even cannot accurately find m (dB) compression point；The present invention completes whole measurement process using PC control, first power scan is carried out in particular measurement Frequency point to travelling-wave tubes to be measured and calculate gain, then the input power of travelling-wave tubes to be measured and gain data are fitted using higher order polynomial curve matching and gain compression characteristics is calculated according to matched curve, finally carry out the gain compression pattern measurement that frequency sweep completes each measurement frequency point；Whole measurement process only needs to arrange initialization survey parameter, without the need for manual intervention, significantly shortens time of measuring, lifting measurement efficiency；Meanwhile, input gain relation data is carried out curve fitting, according to the variation tendency automatic decision linear work point of matched curve, and by fitting by discrete measurement data serialization, greatly improves certainty of measurement.
Description
Technical field
The invention belongs to automatic test technology field, and in particular to a kind of travelling-wave tubes gain compression characteristics automatic measurement side
Method.
Background technology
Travelling-wave tubes is a class widely used microwave vacuum electronic device in modern military, the communications field, with very
Important effect.When input power increase to make travelling-wave tubes gain reduction and cause power output in non-linear increase when, just
Generation gain compression.The most frequently used travelling-wave tubes gain compression characteristics parameter is-m (dB) compression point, and he is defined as travelling-wave tubes gain
Corresponding operating point when reducing m (dB) by small-signal gain.
At present, due to fabricating the nonlinear characteristic of precision and material, travelling-wave tubes gain has in linear zone not constant
The fluctuation that can not ignore；And travelling-wave tubes power gain compression property parameter measurement, and specific firstly the need of being determined by tester
The small-signal gain operating point of travelling-wave tubes to be measured under frequency, then find the operating point conduct-m (dB) that gain declines m (dB) backward
Compression point；Although this method measurement procedure is simple, there is following defect：1st, survey crew is needed to determine by personal experience
Travelling-wave tubes small-signal operation point, directly contributes-m (dB) the compression point measurement as benchmark and there is inevitably measurement and miss
Difference；2nd, situation that travelling-wave tubes input power resolution ratio cannot meet the requirement of certainty of measurement there may be, it is impossible to accurately find-m
(dB) compression point position.
Content of the invention
Present invention aims to the deficiency that above-mentioned prior art is present, provides a kind of travelling-wave tubes gain compression characteristics
Method for automatic measurement, to solve in existing measuring method, measure error is big, even cannot accurately find asking for-m (dB) compression point
Topic.For realizing the purpose, the technical solution used in the present invention is：
A kind of travelling-wave tubes gain compression characteristics method for automatic measurement, comprises the following steps：
Step 1. initialization survey parameter：Including each measurement frequency point in travelling-wave tubes working band to be measured, and traveling wave
Input initial power of the pipe on each measurement frequency point and termination power, measurement power step size；
Step 2. is directed to particular measurement Frequency point, and travelling-wave tubes to be measured is carried out power scan on the test frequency point, note
The input of travelling-wave tubes to be measured, power output data on the measurement frequency point are recorded, the corresponding gain of each power points is calculated, is obtained defeated
Enter power and gain data；
The input power of travelling-wave tubes to be measured and gain data are carried out higher order polynomial curve matching by step 3., are obtained multinomial
Formula matched curve g (x)；
Step 4. using Numerical Methods Solve matched curve g (x) meet in given input range derivative g ' (x)=0 and
Some point sets of g " (x) ＞ 0：x0,x1,...,xl；Wherein, xlFor maximum, g (xl) it is the small-signal gain that tries to achieve；
Solve polynomial equation：The measurement frequency point under-m (dB) gain compression point is obtained；
To step 4, it is special that measurement obtains gain compression of the travelling-wave tubes to be measured on each measurement frequency point to step 5. repeat step 2
Property.
Further, in the step 1, in initialization survey parametric procedure, travelling-wave tubes to be measured is on each measurement frequency point
Input initial power be all set in small-signal area and terminate power and be both needed to be arranged in saturation region.
Further, further, in the step 3, the polynomial fitting that higher order polynomial curve matching is adopted does not surpass
6 ranks are crossed, fitting data adopts international unit watt (W).
The beneficial effects of the present invention is：
The present invention provides a kind of travelling-wave tubes gain compression characteristics method for automatic measurement, and the method is completed using PC control
Whole measurement process, carries out power scan to travelling-wave tubes to be measured in particular measurement Frequency point first and calculates gain, then adopt
The input power of travelling-wave tubes to be measured and gain data are fitted and are calculated according to matched curve by higher order polynomial curve matching
Gain compression characteristics, finally carry out the gain compression pattern measurement that frequency sweep completes each measurement frequency point (i.e. whole frequency band)；Entirely
Measurement process only needs to arrange initialization survey parameter, and whole process is greatly shortened time of measuring, is obviously improved measurement without the need for manual intervention
Efficiency；Meanwhile, the present invention is carried out curve fitting to input-gain relationship data, is sentenced according to the variation tendency of matched curve automatically
Broken string sex work point, is prevented effectively from the false judgment of linear work point in the case of measurement data shake is larger, leads to not standard
- m (dB) compression point is really found；Also, by fitting by discrete measurement data serialization, measure error greatly reduced, improve and survey
Accuracy of measurement.
Description of the drawings
Fig. 1 is the structured flowchart of test system of the present invention.
Fig. 2 is the schematic flow sheet of method for automatic measurement of the present invention.
Fig. 3 is the embodiment of the present invention to gain compression characteristics actual measured results under certain travelling-wave tubes 18GHz frequency.
Specific embodiment
The present invention is described in further details with reference to specific embodiments and the drawings；The embodiment is only used for explaining
The present invention, is not intended to limit the present invention.
Be illustrated in figure 1 the structured flowchart of measuring system of the present invention, including signal source 1, circulator 2, directional coupler 3,
Tested travelling-wave tubes 4, directional coupler 5, high power load 6, power meter 7, power meter 8, host computer 9, data/address bus 10；Signal source
Add circulator 2 to avoid measurement circuitry from mismatching the reflected signal for causing between 1 and directional coupler 3 and damage signal source.
The process for measuring an input and output point of travelling-wave tubes to be measured on a specific frequency is：Host computer 9 is total by data
, to the transmission instruction of signal source 1, the drive signal of control signal source output certain frequency and power, through circulator 2 and work(for line 10
Rate coupler 3 enters tested travelling-wave tubes 4 as actual drive signal, through by orientation coupling after the just signal amplification of tested travelling-wave tubes 4
Clutch 5 and high power load 6 absorb, and power meter 7 and power meter 8 read tested respectively from directional coupler 3 and directional coupler 5
The input-output power of travelling-wave tubes 4 passes host computer 9 back by data/address bus 10.
The flow chart of the present embodiment travelling-wave tubes gain compression characteristics method for automatic measurement is illustrated in figure 2, is embodied as step
Rapid as follows：
Step S100, host computer initialization survey parameter, each equipment self-inspection and examine to each equipment room electrical connectivity
Look into；
Wherein, to refer to each measurement frequency point in wave duct working band, travelling-wave tubes defeated on each frequency for measurement parameter
Enter initial power and terminate power, measurement power step size；The starting measurement power of each Frequency point need to be set in small-signal area
And terminate measurement power and be both needed to be arranged in saturation region；Host computer sends self-test signal by data/address bus to each instrument, treats
Each instrument is returned host computer self-inspection and can be started measurement after signal；
Step S200, each setting frequency on carry out power scan respectively, obtain traveling wave to be measured in each measurement frequency point
Pipe input-output power data, calculate the corresponding gain of each power points；
Wherein, according to signal source power output resolution ratio, set travelling-wave tubes input power and stepping is rationally measured, to each survey
Amount Frequency point carries out power scan；The power measurement on a frequency is often completed, the corresponding gain of each input power is calculated, is obtained
Input-gain relationship under the frequency；
Step S300, to each frequency input-gain relationship data power fitting of a polynomial of travelling-wave tubes to be measured, obtain frequency
The matched curve of input-gain relationship；
Wherein, polynomial fitting is no more than 6 ranks, it is to avoid the functional value outside over-fitting causes sample data much deviates
Desired target；
Step S400, numerical solution matched curve, determine the frequency travelling-wave tubes small-signal operation point, solve the frequency accordingly
Under-m (dB) compression point；
Wherein, the polynomial fitting for step S300 being obtained carries out numerical solution, and a maximum maximum point is determined
For small-signal operation point, then-m (dB) compression point is solved in the range of this maximum point and cut-off input interval.
As shown in figure 3, the actual measured results for gain compression characteristics under certain travelling-wave tubes 18GHz frequency；To above-mentioned each step
In rapid set design parameter as：Initial input power is -20dBm, and cut-off input power is 5dBm, measures power step size
0.5dB, fitting of a polynomial exponent number are 6.As shown in mark in Fig. 3, small-signal gain is measured for 28.6dB, corresponding input power
For -0.62dBm.It is 1.07dBm, -3dB compression point that measurement travelling-wave tubes -1dB compression point under 18GHz frequency corresponds to input power
Corresponding input power is 2.23dBm.
To sum up, the present invention provides a kind of method for automatic measurement of travelling-wave tubes gain compression characteristics, can test automatically traveling wave
Gain compression characteristics parameter of the pipe in frequency band is set on each frequency, need to only arrange initialization survey parameter, and whole process is without the need for people
Work is intervened；Compared with existing measuring method, overcome and cannot be accurately positioned small-signal operation point and travelling-wave tubes driving source to be measured
The measure error that lack of resolution is caused, shortens the testing time, hence it is evident that improve measurement efficiency；The present invention is suitable for travelling-wave tubes increasing
The automatic test of beneficial compression property.
The above, the only specific embodiment of the present invention, any feature disclosed in this specification, except non-specifically
Narration, all can equivalent by other or with similar purpose alternative features replaced；Disclosed all features or all sides
Method or during the step of, in addition to mutually exclusive feature and/or step, all can be combined in any way.
Claims (3)
1. a kind of travelling-wave tubes gain compression characteristics method for automatic measurement, comprises the following steps：
Step 1. initialization survey parameter：Including each measurement frequency point in travelling-wave tubes working band to be measured, and travelling-wave tubes exists
Input initial power on each measurement frequency point and termination power, measurement power step size；
Step 2. is directed to particular measurement Frequency point, and travelling-wave tubes to be measured is carried out power scan on the test frequency point, and record should
The input of travelling-wave tubes to be measured, power output data on measurement frequency point, calculate the corresponding gain of each power points, obtain input work
Rate and gain data；
The input power of travelling-wave tubes to be measured and gain data are carried out higher order polynomial curve matching by step 3., obtain multinomial plan
Close curve g (x)；
Step 4. meets derivative g ' (x)=0 and g " (x) using Numerical Methods Solve matched curve g (x) in given input range
Some point sets of ＞ 0：x0,x1,...,xl；Wherein, xlFor maximum, g (xl) it is the small-signal gain that tries to achieve；
Solve polynomial equation：The measurement frequency point under-m (dB) gain compression point is obtained；
Step 5. repeat step 2 obtains gain compression characteristics of the travelling-wave tubes to be measured on each measurement frequency point to step 4, measurement.
2. travelling-wave tubes gain compression characteristics method for automatic measurement as described in claim 1, it is characterised in that in the step 1, just
During beginningization measurement parameter, input initial power of the travelling-wave tubes to be measured on each measurement frequency point is all set in small-signal area
Interior and terminate power be both needed to be arranged in saturation region.
3. travelling-wave tubes gain compression characteristics method for automatic measurement as described in claim 1, it is characterised in that further, described
In step 3, the polynomial fitting that higher order polynomial curve matching is adopted is less than 6 ranks, and fitting adopts absolute unit, i.e. watt.
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| CN201610816382.4A CN106483437A (en) | 2016-09-12 | 2016-09-12 | A kind of travelling-wave tubes gain compression characteristics method for automatic measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543963A (en) * | 2017-08-22 | 2018-01-05 | 电子科技大学 | A kind of travelling-wave tubes harmonic wave compares Auto-Test System |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202435344U (en) * | 2012-02-15 | 2012-09-12 | 电子科技大学 | Travelling wave tube linearizer |
| CN102710222A (en) * | 2012-05-31 | 2012-10-03 | 电子科技大学 | Linear signal conditioning driving device for traveling wave tube |
-
2016
- 2016-09-12 CN CN201610816382.4A patent/CN106483437A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202435344U (en) * | 2012-02-15 | 2012-09-12 | 电子科技大学 | Travelling wave tube linearizer |
| CN102710222A (en) * | 2012-05-31 | 2012-10-03 | 电子科技大学 | Linear signal conditioning driving device for traveling wave tube |
Non-Patent Citations (1)
| Title |
|---|
| 李镇远等: "《行波管中的微波测量技术》", 31 December 2013 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543963A (en) * | 2017-08-22 | 2018-01-05 | 电子科技大学 | A kind of travelling-wave tubes harmonic wave compares Auto-Test System |
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Inventor after: Huang Tao Inventor after: Liu Yu Inventor after: Gong Dapeng Inventor after: Zhou Xiaoshe Inventor after: Yang Zhonghai Inventor after: Li Bin Inventor before: Liu Yu Inventor before: Huang Tao Inventor before: Gong Dapeng Inventor before: Zhou Xiaoshe |
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