CN106468754A - A kind of travelling-wave tube gain linearity degree method for automatic measurement - Google Patents
A kind of travelling-wave tube gain linearity degree method for automatic measurement Download PDFInfo
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- CN106468754A CN106468754A CN201610815845.5A CN201610815845A CN106468754A CN 106468754 A CN106468754 A CN 106468754A CN 201610815845 A CN201610815845 A CN 201610815845A CN 106468754 A CN106468754 A CN 106468754A
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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, provide a kind of travelling-wave tube gain linearity degree method for automatic measurement, in order to solve the problems, such as that existing measuring method measurement efficiency is low, certainty of measurement is poor；The present invention completes whole measurement process using PC control, first in particular measurement Frequency point, power scan is carried out to travelling-wave tube to be measured, then using higher order polynomial curve matching, the input of travelling-wave tube to be measured, output data are fitted and according to matched curve calculating gain linearity degree, finally perform a scan the gain linearity degree measurement completing each measurement frequency point (i.e. whole frequency band)；Whole measurement process only needs to arrange initialization survey parameter, and whole process, without manual intervention, greatly shortens time of measuring, is obviously improved measurement efficiency；And effectively reduce in hand dipping link and inevitably observe and recording error, substantially increase certainty of measurement.
Description
Technical field
The invention belongs to automatic test technology field is and in particular to a kind of travelling-wave tube gain linearity degree method for automatic measurement.
Background technology
Travelling-wave tube is a class widely used microwave vacuum electronic device in modern military, the communications field, has very
Important effect.Travelling-wave tube gain linearity degree is the index parameter characterizing travelling-wave tube gain flatness in linear amplification region.Reason
In the case of thinking, gain in linear zone for the travelling-wave tube is a constant, but at present non-linear due to processing and manufacturing precision and material
Characteristic, travelling-wave tube gain has the fluctuation that can not ignore in linear zone.
At present, travelling-wave tube power gain linearity measure needs to be walked with small power under characteristic frequency by tester
Enter manual Regulate signal source output driving travelling-wave tube, the input-output power being successively read and recording travelling-wave tube is calculated；This
Although kind of method measurement structure is simple, overall process needs artificial control signal source output frequency and power, makes travelling-wave tube defeated
Enter power with small and equal power step increments, and each power measurement point is increased according to definition manual calculation power increment
Benefit, measurement efficiency is very low；And there may be the situation that signal source output resolution ratio cannot meet the requirement of certainty of measurement,
Certainty of measurement is poor.
Content of the invention
Present invention aims to the deficiency that above-mentioned prior art exists, provide a kind of travelling-wave tube gain linearity degree certainly
Dynamic measuring method, to solve the problems, such as that existing measuring method measurement efficiency is low, certainty of measurement is poor.For realizing this purpose, this
The technical scheme of bright employing is：
A kind of travelling-wave tube gain linearity degree method for automatic measurement, comprises the following steps：
Step 1. initialization survey parameter：Including each measurement frequency point in travelling-wave tube working band to be measured, and traveling wave
Input power range on each measurement frequency point for the pipe, measurement power step size；
Step 2. is directed to particular measurement Frequency point, and travelling-wave tube to be measured is carried out power scan on this test frequency point, note
Record the input of travelling-wave tube to be measured, output data on this measurement frequency point；
The input of travelling-wave tube to be measured, output data are carried out higher order polynomial curve matching by step 3., obtain multinomial
Formula matched curve f (x)；
Step 4. adopts Numerical Methods Solve matched curve f (x) in maximum f ' (x) of given input range interior derivativemax
With minima f ' (x)min, thus calculating gain linearity degree dl on this measurement frequency point for the travelling-wave tube to be measured：
Step 5. repeat step 2 obtains gain linearity on each measurement frequency point for the travelling-wave tube to be measured to step 4, measurement
Degree.
Further, in described step 1, in initialization survey parametric procedure, travelling-wave tube to be measured is on each measurement frequency point
Input power range may be contained within linear amplification region.
Further, in described step 3, the polynomial fitting that higher order polynomial curve matching adopts is less than 6 ranks, matching
Data adopts iu watt (W).
The beneficial effects of the present invention is：
The present invention provides a kind of travelling-wave tube gain linearity degree method for automatic measurement, and the method is completed whole using PC control
Individual measurement process, carries out power scan to travelling-wave tube to be measured in particular measurement Frequency point first, then adopts higher order polynomial bent
The input of travelling-wave tube to be measured, output data are fitted and calculate gain linearity degree according to matched curve, by line matching
Laggard line frequency scanning completes the gain linearity degree measurement of each measurement frequency point (i.e. whole frequency band)；Whole measurement process only needs to set
Put initialization survey parameter, whole process, without manual intervention, greatly shortens time of measuring, is obviously improved measurement efficiency；And effectively
Reduce in hand dipping link and inevitably observe and recording error, substantially increase certainty of measurement.
Brief description
Fig. 1 is the structured flowchart of measuring system of the present invention.
Fig. 2 is the schematic flow sheet of the method for automatic measurement of the present invention.
Fig. 3 is the gain linearity degree in actual measurement 6-18GHz travelling-wave tube working band in the embodiment of the present invention.
Specific embodiment
With reference to specific embodiments and the drawings, the present invention is described in further details；Described 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 tube 4, directional coupler 5, high power load 6, energy meter 7, energy meter 8, host computer 9, data/address bus 10；Signal source
Add circulator 2 to avoid measurement circuitry to mismatch the reflected signal leading between 1 and directional coupler 3 and damage signal source.
The process measuring an input and output point of travelling-wave tube to be measured on a specific frequency is：It is total that host computer 9 passes through data
Line 10 transmits instruction to signal source 1, and control signal source exports the drive signal of certain frequency and power, through circulator 2 and work(
Rate bonder 3 enters tested travelling-wave tube 4 as actual drive signal, through by orientation coupling after the just signal amplification of tested travelling-wave tube 4
Clutch 5 and high power load 6 absorb, and energy meter 7 and energy meter 8 read tested respectively from directional coupler 3 and directional coupler 5
The input-output power of travelling-wave tube 4 passes host computer 9 back by data/address bus 10.
The flow chart being illustrated in figure 2 travelling-wave tube gain linearity degree method for automatic measurement in the present embodiment, is embodied as walking
Suddenly as follows：
Step S100, host computer initialization survey parameter, each equipment self-inspection and each equipment room electrical connectivity is examined
Look into；
Wherein, to refer to each measurement frequency point in wave duct working band, travelling-wave tube defeated on each frequency for measurement parameter
Enter initial power and terminate power, measurement power step size.Need to ensure that in measurement process, travelling-wave tube output is with input work
The increase of rate and strictly monotone increase, and that is, travelling-wave tube is operated in non-saturated region in this input power range；Host computer passes through
Data/address bus sends self-test signal to each instrument, returns host computer self-inspection after each instrument and can start to measure after signal；
Step S200, each set frequency on carry out power scan respectively, obtain traveling wave to be measured in each measurement frequency point
Pipe input-output power data；
Wherein, according to signal source output resolution, set travelling-wave tube input power and rationally measure stepping, to each survey
Amount Frequency point carries out power scan；Often complete the power measurement on a frequency, judge whether output power measurement sequence is dull
Increase, such as non-monotonic incremental, cast out this frequency measurement data；
Step S300, to travelling-wave tube to be measured each frequency input-output power fitting of a polynomial, obtain frequency input and output
Relation matched curve；
Wherein, before carrying out fitting of a polynomial, input, the correlation coefficient of output data are calculated, if the two good relationship,
Can use relatively low matching exponent number, if dependency is poor, needs to use higher order polynomial-fitting, have ensured that fitting precision；But matching is many
Item formula is no more than 6 ranks, it is to avoid the functional value outside over-fitting makes sample data much deviates desired target；
Step S400, numerical solution matched curve, calculate the gain of travelling-wave tube each frequency in measurement frequency according to definition
The linearity.
Wherein, polynomial fitting step S300 being obtained carries out numerical solution, finds matched curve in input power model
Enclose the maximum and minimum value of interior derivative, calculate the gain on each travelling-wave tube to be measured each frequency in working band according to definition
The linearity.
As shown in figure 3, for the present embodiment to certain 6-18GHz travelling-wave tube gain linearity degree measurement result；To above-mentioned each step
In rapid set design parameter as：Initial frequency is 6GHz, and cut-off frequency is 18GHz, and frequency step is 0.5GHz, and each frequency rises
Beginning input power is -15dBm, terminates input power and is 10dBm, measure power step size 0.2dB, fitting of a polynomial exponent number is
6.Find out in Fig. 3, actual measurement travelling-wave tube substantially meets design parameter requirement in each measurement frequency point gain linearity degree all on 0.8.
To sum up, the present invention provides the method for automatic measurement of travelling-wave tube gain linearity degree, can automatically test travelling-wave tube and set
Determine the gain linearity degree on each frequency in frequency band, initialization survey parameter only need to be set, and whole process is without manual intervention；With original
Manual measurement method is compared hence it is evident that shortening the testing time, improves efficiency, and is avoided because of travelling-wave tube using the method for matching
The measurement error that resolution of the output of input source etc. causes, the automatization being suitable for travelling-wave tube gain linearity degree parameter surveys
Examination.
The above, the only specific embodiment of the present invention, any feature disclosed in this specification, except non-specifically
Narration, all can be replaced by other alternative features that are equivalent or having similar purpose；Disclosed all features or all sides
Method or during step, in addition to mutually exclusive feature and/or step, all can be combined in any way.
Claims (3)
1. a kind of travelling-wave tube gain linearity degree method for automatic measurement, comprises the following steps：
Step 1. initialization survey parameter：Including each measurement frequency point in travelling-wave tube working band to be measured, and travelling-wave tube exists
Input power range on each measurement frequency point, measurement power step size；
Step 2. is directed to particular measurement Frequency point, travelling-wave tube to be measured is carried out on this test frequency point power scan, and record should
The input of travelling-wave tube to be measured, output data on measurement frequency point；
The input of travelling-wave tube to be measured, output data are carried out higher order polynomial curve matching by step 3., obtain multinomial and intend
Close curve f (x)；
Step 4. adopts Numerical Methods Solve matched curve f (x) in maximum f ' (x) of given input range interior derivativemax?
Little value f ' (x)min, thus calculating gain linearity degree dl on this measurement frequency point for the travelling-wave tube to be measured：
Step 5. repeat step 2 obtains gain linearity degree on each measurement frequency point for the travelling-wave tube to be measured to step 4, measurement.
2. as described in claim 1 travelling-wave tube gain linearity degree method for automatic measurement it is characterised in that in described step 1, initially
During changing measurement parameter, input power range on each measurement frequency point for the travelling-wave tube to be measured may be contained within linear amplification region
Interior.
3. as described in claim 1 travelling-wave tube gain linearity degree method for automatic measurement it is characterised in that in described step 3, high-order
The polynomial fitting that polynomial curve fitting adopts is less than 6 ranks, and matching adopts absolute unit：Watt.
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Cited By (2)
| 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 |
| CN109508511A (en) * | 2018-12-24 | 2019-03-22 | 中国航空工业集团公司西安飞机设计研究所 | Frequency sweeping method in frequency response analysis measurement |
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| CN1627741A (en) * | 2003-10-10 | 2005-06-15 | 直视集团公司 | Coherent averaging for measuring traveling wave tube amplifier nonlinearity |
| 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 |
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2016
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Patent Citations (3)
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| CN1627741A (en) * | 2003-10-10 | 2005-06-15 | 直视集团公司 | Coherent averaging for measuring traveling wave tube amplifier nonlinearity |
| 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 (2)
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| 李镇远等: "《行波管中的微波测量技术》", 31 December 2013 * |
| 黄桃等: "行波管全电参数自动测试系统设计与实现", 《2016真空电子学分会第二十届学术年会论文集（上）》 * |
Cited By (3)
| 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 |
| CN109508511A (en) * | 2018-12-24 | 2019-03-22 | 中国航空工业集团公司西安飞机设计研究所 | Frequency sweeping method in frequency response analysis measurement |
| CN109508511B (en) * | 2018-12-24 | 2023-06-23 | 中国航空工业集团公司西安飞机设计研究所 | Frequency sweeping method in frequency response analysis and measurement |
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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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Application publication date: 20170301 |