CN106556788A - A kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier - Google Patents
A kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier Download PDFInfo
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- CN106556788A CN106556788A CN201611021970.5A CN201611021970A CN106556788A CN 106556788 A CN106556788 A CN 106556788A CN 201611021970 A CN201611021970 A CN 201611021970A CN 106556788 A CN106556788 A CN 106556788A
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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 microwave testing field, a kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier is specifically provided, feedback mechanism is added by the outfan (travelling-wave tube input to be measured) in pre-amplifier, to guarantee that travelling-wave tube input power is effective, to obtain correct travelling-wave tube input-output characteristic test result；The present invention can complete travelling-wave tube input-output characteristic and test automatically, test can intuitively be found out the linear zone of travelling-wave tube work on computers in real time in carrying out and progressively reach the process of saturation, special parameter can be gone out by test data analysis, such as saturation point, 1dB compression points and small-signal gain etc., can data storage so as to other purposes；Greatly improve test accuracy and efficiency.
Description
Technical field
The invention belongs to microwave testing field, and in particular to a kind of travelling-wave tube input and output with pre-amplifier are special
Property automatic test approach.
Background technology
Travelling-wave tube is a kind of important electron tube, has been obtained extensively in fields such as electronic countermeasure, radar and satellite communications
General application.Power is the most basic parameter of travelling-wave tube, and the research to travelling-wave tube input-output characteristic shows, defeated when travelling-wave tube
Enter power it is less when, its output and input power are linear relations, and travelling-wave tube is operated in linear zone in other words.Linear
Area it is high-end, after input power is further increased, output still increases with the increase of input power, but gathers way
Slack-off, its output and input power are no longer linear relationships, and this indicates that inelastic region has been jumped in the work of travelling-wave tube.After
Continuous increase input power, output are not further added by, and now travelling-wave tube reaches saturation, continue increase input power output work
Rate is arranged and may be declined, and travelling-wave tube is entered hypersaturated state.Input-output characteristic describe the output of travelling-wave tube with it is defeated
Enter the variation relation between power, by input-output characteristic curve can visually see travelling-wave tube work linear zone with
And gradually reach the process of saturation.
The situation of instantly universal presence, some powerful travelling-wave tubies are higher to prime drive signal power requirement, and
Existing signal source output limit of power is limited, directly uses the output of signal source as the input power of travelling-wave tube
The power standard of travelling-wave tube requirement is not reached often.Now common practice is between signal source and travelling-wave tube, add prime to put
Big device is improving source power.But as the gain fluctuation of pre-amplifier affects, adjustment signal source power is defeated to change travelling-wave tube
When entering power, in fact it could happen that the situation that travelling-wave tube input power does not follow signal source output to change and changes, now test
Easily there is erroneous judgement in system, obtains incorrect test result.
In existing automatic test, due to the impact of pre-amplifier gain fluctuation, test result often occurs what is judged by accident
Situation.The output that travelling-wave tube is detected when such as increasing signal source output starts reduction and must go out travelling-wave tube from saturation shape
State is transitioned into the conclusion of hypersaturated state, and the phenomenon is also likely to be to be caused due to pre-amplifier gain fluctuation in fact, it is necessary to
Abnormal conditions are planted after exclusion and can obtain correct test result.This shortcoming causes existing Auto-Test System in actual row
Greatly restriction is received in the test of wave duct input-output characteristic, the invention provides a kind of input of the travelling-wave tube with pre-amplifier
Output characteristics automatic test approach, can be good at solving the above problems.
The content of the invention
Present invention aims to the deficiencies in the prior art, there is provided a kind of input of the travelling-wave tube with pre-amplifier is defeated
Go out characteristic automatic test approach.In order to realize the purpose, the technical scheme that the present invention is provided is：
A kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier, comprises the following steps：
Step 1：Initialization test system, arranges signal source output frequency and energy meter test frequency, initialization feedback time
Number is 0；
Step 2：Signal source output stepping is set, and initializing signal source output is minimum power；
Step 3：Travelling-wave tube input energy meter and travelling-wave tube input energy meter are sampled travelling-wave tube input work to be measured respectively
Rate and output；
Step 4：Judge whether travelling-wave tube to be measured enters linear zone, if entering, into step 5；Otherwise, skip to step 7；
Step 5：Whether effectively to judge travelling-wave tube input power to be measured, decision criteria is as follows：
When Times of Feedback is 0, compare this test data of travelling-wave tube input energy meter and a front test data, if
This test data is more than a front test data, then judge effective, and Times of Feedback sets to 0, into step 6；Otherwise, labelling traveling wave
Before pipe input energy meter, a test data is Dx, and Times of Feedback adds 1, into step 8；
When Times of Feedback is non-zero, compare this test data of travelling-wave tube input energy meter and Dx, if this test number
According to more than Dx, then judge effective, Times of Feedback sets to 0, into step 6；Otherwise, Times of Feedback adds 1, into step 8；
Step 6：Judge travelling-wave tube whether saturation, if saturation, record data, and calculate output travelling-wave tube work to be measured
Saturation point input power and output, 1dB compression points input power and output, saturation dot gains, 1dB pressure under frequency
Point reduction gain and small-signal gain, jump to step 9；Otherwise, record data, into step 7；
Step 7：Determine whether to reach power scan termination condition, if not up to, according to signal source output stepping
Increase signal source output, skip to step 3；If reaching, terminate the travelling-wave tube to be measured working frequency points and test, skip to step 9；
Step 8：Whether decision-feedback number of times reaches pre-set threshold value, if reaching pre-set threshold value, reports an error, and terminates traveling wave to be measured
Manage the working frequency points to test, skip to step 9；Otherwise, into step 7；
Step 9：Repeat step 1 completes frequency scanning to step 8, and the input for obtaining each working frequency points of travelling-wave tube to be measured is defeated
Go out characteristic.
Further, the power scan termination condition is to meet following either condition：
A, signal source output reach capacity；
B, travelling-wave tube input power to be measured have reached default stop power.
Instrument Control Technology of the present invention based on LabVIEW, it is right to be realized by LAN/GPIB buses using LabVIEW softwares
The remotely control measurement of instrument, makes signal source and energy meter cooperate with orderly work, and records automatically and preserve data to calculating
Machine, directly obtains test curve by the powerful data-handling capacity of computer, and then realizes the real-time same of data and figure
Step display, effectively extends the function of energy meter；More importantly programmed readability is strong, be easily modified, be easy to transplanting, test
System is easy to use so that the present invention can realize different operating frequency range, the test of the measured device of different qualities, greatly
Improve work efficiency in ground.
The present invention having the beneficial effect that compared with prior art：
A kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier is provided in the present invention, by front
The outfan (travelling-wave tube input to be measured) of level amplifier adds feedback mechanism, to guarantee that travelling-wave tube input power is effective
, to obtain correct travelling-wave tube input-output characteristic test result；The present invention can complete travelling-wave tube input-output characteristic certainly
Dynamic test, test can intuitively be found out the linear zone of travelling-wave tube work on computers in real time in carrying out and progressively reach saturation
Process, special parameter can be gone out by test data analysis, such as saturation point, 1dB compression points and small-signal gain etc., number can be stored
Just other purposes according to this；Greatly improve test accuracy and efficiency.
Description of the drawings
Fig. 1 is the travelling-wave tube input-output characteristic automatic test approach schematic flow sheet figure with pre-amplifier of the invention.
Fig. 2 is the test system that travelling-wave tube input-output characteristic automatic test approach of the present invention with pre-amplifier is adopted
Figure.
Fig. 3 is the travelling-wave tube input-output characteristic automatic test approach test result figure with pre-amplifier of the invention.
Specific embodiment
Embodiments of the present invention are illustrated below in conjunction with the accompanying drawings specifically, it should be understood that embodiment is only for reference and explanation makes
With, and do not constitute the restriction to scope of patent protection of the present invention.
The present embodiment provides a kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier, and which adopts survey
Test system is as shown in Figure 2：Two instruments have been used in system mainly：Signal source with GPIB/LAN interfaces and dual pathways power
Meter；In order to ensure to measure quality, the harmonic component of signal source is little；Power head and high power load used by energy meter will have good
Good matching performance；Directional coupler will have the flat degree of coupling, higher directivity and good port match；Depending on to be measured
Depending on travelling-wave tube, the operating frequency of all of instrument and microwave device, power bracket should meet the requirements, the coupling to directional coupler
It is right to pass through the calculating or assessment for carrying out, to ensure that power head is operated in linear zone；Pass through GPIB/ between computer and instrument
LAN buses are connected.In such a system, computer passes through bus control signal source and energy meter, what signal source need to be given by test
Condition sends certain frequency and power signal, the input power of tested travelling-wave tube is sampled through directional coupler 1, orients coupling
Clutch 2 is sampled to the output of tested travelling-wave tube, is gathered by power head 1 and 2 respectively, is sent into energy meter and is measured, calculates
Machine carries out processing the equal excitation characteristic curve chart for providing tested travelling-wave tube to the data for collecting.
A kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier, its flow process is as shown in figure 1, in detail
Step is as follows：
A kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier, comprises the following steps：
Step 1：Initialization test system, arranges signal source output frequency and energy meter test frequency, initialization feedback time
Number is 0；
Step 2：Signal source output stepping is set, and initializing signal source output is minimum power；
Step 3：Travelling-wave tube input energy meter and travelling-wave tube input energy meter are sampled travelling-wave tube input work to be measured respectively
Rate and output；
Step 4：Judge whether travelling-wave tube to be measured enters linear zone, if entering, into step 5；Otherwise, skip to step 7；
Step 5：Whether effectively to judge travelling-wave tube input power to be measured, decision criteria is as follows：
When Times of Feedback is 0, compare this test data of travelling-wave tube input energy meter and a front test data, if
This test data is more than a front test data, then judge effective, and Times of Feedback sets to 0, into step 6；Otherwise, labelling traveling wave
Before pipe input energy meter, a test data is Dx, and Times of Feedback adds 1, into step 8；
When Times of Feedback is non-zero, compare this test data of travelling-wave tube input energy meter and Dx, if this test number
According to more than Dx, then judge effective, Times of Feedback sets to 0, into step 6；Otherwise, Times of Feedback adds 1, into step 8；
Step 6：Judge travelling-wave tube whether saturation, if saturation, record data, and calculate output travelling-wave tube work to be measured
Saturation point input power and output, 1dB compression points input power and output, saturation dot gains, 1dB pressure under frequency
Point reduction gain and small-signal gain, jump to step 9；Otherwise, record data, into step 7；
Step 7：Determine whether to reach power scan termination condition, if not up to, according to signal source output stepping
Increase signal source output, skip to step 3；If reaching, terminate the travelling-wave tube to be measured working frequency points and test, skip to step 9；
Step 8：Whether decision-feedback number of times reaches pre-set threshold value, if reaching pre-set threshold value, reports an error, and terminates traveling wave to be measured
Manage the working frequency points to test, skip to step 9；Otherwise, into step 7；
Step 9：Repeat step 1 completes frequency scanning to step 8, and the input for obtaining each working frequency points of travelling-wave tube to be measured is defeated
Go out characteristic.
Further, the power scan termination condition is to meet following either condition：
A, signal source output reach capacity；
B, travelling-wave tube input power to be measured have reached default stop power.
The frequency range that the present embodiment is tested in the travelling-wave tube input-output characteristic automatic test approach with pre-amplifier
For 9GHz～15GHz, frequency step is 1GHz, and stop power is 35dBm, and this protection power for measured piece, such as measured piece are defeated
Enter power reach this power then stop test, initial power stepping be 1dBm, Times of Feedback pre-set threshold value be 5 times；While in order to
Accurate parameter point, such as saturation point etc. are found, test carries out middle meeting dynamic adjustment stepping, i.e., reduces work(near arrival saturation point
Rate stepping.As shown in figure 3, wherein, abscissa is that the input power tested under a certain frequency of device, vertical coordinate are to its test result
Output, tests video data：Frequency and its corresponding saturation point input power, saturation point output power, 1dB compression points are defeated
Enter power, 1dB compression point output powers, saturation dot gains, 1dB compression dot gains and small-signal gain.
Design by more than, it is automatic using a kind of travelling-wave tube input-output characteristic with pre-amplifier proposed by the present invention
Method of testing, the method include test process control and result in computer by the powerful data-handling capacity of computer
Upper realization, not only greatly reduces cost, also makes the simpler refine of system, and the method substantially increases testing efficiency.
The principal character and advantage of the present invention are had been shown and described above, those skilled in the art is it should be appreciated that this reality
Apply example and be to aid in the principle that reader understands the present invention, it should be understood that protection scope of the present invention is not limited to such
Especially state and embodiment.These technologies disclosed by the invention can enlighten that to make various other without departing from essence of the invention each
Plant concrete deformation and combine, these deformations and combination are still within the scope of the present invention.
Claims (1)
1. a kind of travelling-wave tube input-output characteristic automatic test approach with pre-amplifier, comprises the following steps：
Step 1：Initialization test system, arranges signal source output frequency and energy meter test frequency, and initialization Times of Feedback is
0；
Step 2：Signal source output stepping is set, and initializing signal source output is minimum power；
Step 3：Travelling-wave tube input energy meter and travelling-wave tube input energy meter sample respectively travelling-wave tube input power to be measured and
Output；
Step 4：Judge whether travelling-wave tube to be measured enters linear zone, if entering, into step 5；Otherwise, skip to step 7；
Step 5：Whether effectively to judge travelling-wave tube input power to be measured, decision criteria is as follows：
When Times of Feedback is 0, compare this test data of travelling-wave tube input energy meter and a front test data, if this
Test data is more than a front test data, then judge effective, and Times of Feedback sets to 0, into step 6；Otherwise, labelling travelling-wave tube is defeated
Before entering to hold energy meter, a test data is Dx, and Times of Feedback adds 1, into step 8；
When Times of Feedback is non-zero, compare this test data of travelling-wave tube input energy meter and Dx, if this test data is big
In Dx, then judge effective, Times of Feedback sets to 0, into step 6；Otherwise, Times of Feedback adds 1, into step 8；
Step 6：Judge travelling-wave tube whether saturation, if saturation, record data, and calculate output travelling-wave tube working frequency points to be measured
Under saturation point input power and output, 1dB compression points input power and output, saturation dot gains, 1dB compression points
Gain and small-signal gain, jump to step 9；Otherwise, record data, into step 7；
Step 7：Determine whether to reach power scan termination condition, if not up to, increase according to the stepping of signal source output
Signal source output, skips to step 3；If reaching, terminate the travelling-wave tube to be measured working frequency points and test, skip to step 9；
Step 8：Whether decision-feedback number of times reaches pre-set threshold value, if reaching pre-set threshold value, reports an error, and terminating travelling-wave tube to be measured should
Working frequency points are tested, and skip to step 9；Otherwise, into step 7；
Step 9：Repeat step 1 completes frequency scanning to step 8, and the input and output for obtaining each working frequency points of travelling-wave tube to be measured are special
Property.
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Cited By (3)
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| 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 |
| CN109507497A (en) * | 2018-11-06 | 2019-03-22 | 电子科技大学 | A kind of full electrical parameter integration Auto-Test System of space travelling wave tube |
| CN113049899A (en) * | 2021-03-22 | 2021-06-29 | 中国科学院高能物理研究所 | Automatic aging and data analysis system for coupler |
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| CN101969298A (en) * | 2010-09-30 | 2011-02-09 | 中国船舶重工集团公司第七二三研究所 | High-power travelling wave tube amplifier for broadband |
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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 |
| CN109507497A (en) * | 2018-11-06 | 2019-03-22 | 电子科技大学 | A kind of full electrical parameter integration Auto-Test System of space travelling wave tube |
| CN113049899A (en) * | 2021-03-22 | 2021-06-29 | 中国科学院高能物理研究所 | Automatic aging and data analysis system for coupler |
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Inventor after: Huang Tao Inventor after: Zhou Xiaoshe Inventor after: Gong Dapeng Inventor after: Yang Zhonghai Inventor after: Li Bin Inventor before: Huang Tao Inventor before: Zhou Xiaoshe Inventor before: Gong Dapeng Inventor before: Li Bin |
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Application publication date: 20170405 |