CN106656306B - A kind of transponder third order intermodulation test method based on vector network analyzer - Google Patents
A kind of transponder third order intermodulation test method based on vector network analyzer Download PDFInfo
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- CN106656306B CN106656306B CN201611118307.7A CN201611118307A CN106656306B CN 106656306 B CN106656306 B CN 106656306B CN 201611118307 A CN201611118307 A CN 201611118307A CN 106656306 B CN106656306 B CN 106656306B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
A kind of transponder third order intermodulation high-efficiency high-accuracy test method based on arrow net, step are as follows: (1) arrow is netted and carry out calibration parameter setting, complete the Measurement channel calibration under Swept IMD Converters mode；(2) radio frequency testing cable is connected, with building complete star test loop；(3) under well-established calibration environment, related test parameters are set, open double-tone RF excited power, test the third order intermodulation characteristic of transponder, draw test result curve.Test convenience, testing efficiency, measuring accuracy and the test automation degree that the method for the present invention can significantly improve communication satellite coverage system dual carrier third order intermodulation can substantially reduce testing cost for extensive multichannel transponder.
Description
Technical field
The invention belongs to satellite test fields, are related to a kind of test method of communication satellite coverage subsystem, especially suitable
The satellite repeater more for power amplifier and number of vias can greatly improve testing efficiency under the premise of guaranteeing measurement accuracy.
Background technique
Transponder subsystem is the important component of telecommunication satellite, and the performance quality of radio-frequency channel directly affects satellite
The signal quality of communication service.During satellite communication, when there are two the carrier signals of different frequency to enter transponder simultaneously
It is non-linear due to input-output characteristic when system, so that in output signal other than the incoming carrier useful signal being amplified,
It there is also the intermodulation product of other frequencies.On the one hand, intermodulation product will occupy a part of output power；On the other hand, these
If intermodulation product is fallen within the scope of the working band of transponder, it will interfered to system communication.In addition, strong carrier signal
The intermodulation product of generation can partially inhibit weak carrier signal sometimes, be unfavorable for the compatibility of size earth station.In all intermodulation products
In, influence of the third-order intermodulation product to system performance is the most serious, therefore telecommunication satellite only tests dual carrier third order intermodulation at present
Characteristic, and the nonlinear degree of transponder is assessed accordingly.
Dual carrier third order intermodulation is the important radio-frequency performance index of transponder subsystem, directly reflects radio-frequency transmitter
And transponder caused by the amplitude non-linearity characteristic of the nonlinear devices such as power amplifier exports intermodulation product size, therefore to it
It is accurately measured most important.The size of third-order intermodulation product is related with the amplitude of transponder subsystem pumping signal, excitation
The size of amplitude generally makes opposite measurement, the i.e. saturation input signal of input test signal and transponder of " input offset value "
The ratio between level.In actual test, with two constant-amplitude carriers in different input offsets, measurement output keynote signal and three ranks are mutual
Adjust third order intermodulation nonlinear metric of the Amplitude Ratio of signal as transponder system.
Current communication satellite coverage third order intermodulation testing scheme is using two independent signal generators, tested
The single carrier Upstream driver signal for generating two constant amplitudes in transponder channel simultaneously inputs transponder, and presses centainly after combining
Stepping changes the power of Upstream driver signal, measures the third-order intermodulation product in tested transponder channel respectively by spectrum analyzer
Power and keynote signal power finally calculate the third order intermodulation characteristic in tested transponder channel according to test data.This method
In Practical Project test, there is certain limitation:
(1) test macro is by two signal sources, a power meter, a frequency spectrograph, a switch matrix and a test
Computer composition, needs the test cabinet of 22U that could integrate all test equipments, volume is big, power consumption is big, at high cost, and sets
Radio frequency connection between standby is more, and two signal sources and frequency spectrograph are independent of one another, needs external synchronic base, therefore system building is multiple
It is miscellaneous；
(2) it when testing, needs according to single carrier saturation benchmark and uplink monitoring power meter readings, manually by two independent letters
The output power leveling in number source and make repeater operation on requiring operating point by test link, power adjustment procedure is complicated
It is tediously long, and manual leveling is unable to reach very high accuracy, there is also over excited risks.When the Dual Channel Consistency for Dual of combiner
When bad or two carrier waves frequency differences are larger, test link load differs greatly, so that reaching the dual carrier of transponder entrance
Between there are level difference, can not complete constant amplitude so that there are deviations for test result；
(3) when testing, dual carrier power is down to regulation input back-off according to regulation step-length, from saturation input, each
Operating point all needs to adjust double source output level repeatedly again, reuses frequency spectrograph search signal and calculate current metric results.
And in test process, need respectively and artificially the instruments such as synchronous control signal source, frequency spectrograph realize that signal sends and receives.To protect
It demonstrate,proves every single stepping to execute with being devices under accurate and exhaustive, need to be inserted into the time between each operational order prolongs
(usually 0.5s~2s) late, test process there is no hardware synchronization in all senses, and it is tediously long, efficiency is lower, complete all the way
Transponder third order intermodulation tests (generally at least 20 operating points) about 15 minutes.In extensive multichannel transponder third order intermodulation
In test, the method can seriously affect testing efficiency；
(4) in test macro, since test equipment is more, radio frequency connecting link is complicated, two exciting signal sources are by opening
The combiner composite signal of internal matrix is closed, therefore radiofrequency signal undergoes multistage inactive component and multiple connecting end surfaces, causes whole
A system mismatch error is larger.This test method only monitors uplink input power with power meter, not to the mistake of test macro
Analysis processing is done with property error.In addition, power of this method using frequency spectrograph measurement downlink intermodulation product, uncertainty is larger,
Test result error is larger；
(5) if in remote testing, each step is to the control of test equipment, the reading of measurement data and test result
Calculating requires specially to work out upper computer software to complete, software execution flow journey have complicated loop nesting, sequential relationship and
Design and debugging difficulty, test macro robustness be not strong.
Summary of the invention
Technical problem solved by the present invention is having overcome the deficiencies of the prior art and provide a kind of based on vector network analysis
The transponder third order intermodulation characteristic test method of instrument can significantly improve communication satellite coverage system dual carrier third order intermodulation
Convenience, testing efficiency, measuring accuracy and test automation degree are tested, for extensive multichannel transponder,
Testing cost can substantially be reduced.
The technical solution of the invention is as follows: a kind of transponder third order intermodulation high-efficiency high-accuracy test side based on arrow net
Method includes the following steps:
(1) choose one with Swept IMD Converters measurement pattern built-in double source vector network analyzer and
One switch matrix with arrow net test access is as test equipment；The arrow net test access includes uplink and downlink,
For the input port of uplink labeled as A mouthfuls of arrow net, which is connected directly to the input of the uplink beam port inside switch matrix,
The output port of uplink is the output of the uplink beam port；The input port of downlink is the downlink wave beam inside switch matrix
The input of port, for the output port of downlink labeled as B mouthfuls of arrow net, which is one RF switch of multiselect inside switch matrix
Optional output all the way；
(2) calibration is performed a scan to vector network analyzer, and the TCH test channel after the completion of calibration is stored as swearing
.csa file inside net；
(3) PORT1 of vector network analyzer is connected to A mouthfuls of arrow net of switch matrix, by vector network analyzer
PORT2 be connected to arrow net B mouthfuls, by upper planet test cable both ends be connected to respectively transponder to be measured input test coupler it is straight
The uplink beam port of port and switch matrix, by lower planet the both ends of test cable are connected to the output of transponder to be measured respectively
The downlink wave beam port of test coupler coupling aperture and switch matrix；
(4) stored .csa calibration environment is called in vector network analyzer, and by the scanning of current Measurement channel
Mode is changed to power scan by frequency scanning, and carries out test ginseng to vector network analyzer according to the basic parameter of tested transponder
Number configuration, including inside vector network analyzer between the power scan range of double source, output dual carrier dominant frequency centre frequency,
Centre frequency, double wave frequency difference between local frequency, input dual carrier dominant frequency, dominant frequency signal receive intermediate-frequency bandwidth and intermodulation letter
Number receive intermediate-frequency bandwidth；
(5) the radio-frequency power output for opening vector network analyzer, is completed under power scan by vector network analyzer
Third order intermodulation characteristic test.
The method that calibration is performed a scan to vector network analyzer in the step (2) are as follows: stub cable 1 will be tested
One end be connected to power meter probe, the other end is connected to the port vector network analyzer PORT1, carry out the double source calibration of power,
So that output end complete constant amplitude of the dual carrier signal in test stub cable 1, while automatic calibration reference receiver A1；Then it keeps
The connecting pin for testing stub cable 1 and arrow net PORT1 is constant, the other end is connected to the PORTA of Electronic Calibration part, while will test
One end of stub cable 2 is connected to arrow net PORT2, and the other end is connected to the PORTB of Electronic Calibration part, completes Two-port netwerk SC parameter school
Standard obtains the response of B2 receiver by calibration data.
The advantages of the present invention over the prior art are that:
(1) test method of the invention is on hardware structure, it is only necessary to a vector network analyzer and a cubicle switchboard
Battle array (also needing temporarily to use power meter and Electronic Calibration part when calibration), therefore than in traditional scheme two signal sources, one
Frequency spectrograph, a power meter and a switch matrix composition hardware system more minimize, lightweight, and with it is lower at
Sheet and higher level of integrated system.Further, since instrument quantity is reduced, the connection quantity between instrument is reduced, and reliability is opposite
It is higher in traditional testing scheme；
(2) present invention is sufficiently by the hardware synchronization of vector network analyzer transmit-receive sharing platform and vector network analyzer
Characteristic, builds the hardware testing system using vector network analyzer as core, and calibration efficiency and testing efficiency all compare traditional test
Scheme greatly improves.Calibration aspect, the present invention are calibrated using vector network analyzer frequency sweep, are completed by single pass to institute
There is the calibration of the performance number and mismatch in transponder channel.And the calibration in this third order intermodulation channel can also be with other Measurement channels
It calibrates while carrying out, therefore serially calibrated than traditional single channel and improve 3~5 times in efficiency.Test aspect, traditional test scheme
There is no the hardware synchronization modes in all senses.And the core test equipment vector network analyzer energy of test macro of the present invention
Enough realize the synchronization on hardware sense, transmitting-receiving synchronization delay is Microsecond grade.And the present invention is tested using power scan
Method, speed promotes about magnitude relative to traditional single-point power stepping scheme, therefore has 8 in terms of testing efficiency
Times or more promotion；
(3) the two signal driving sources provided inside vector network analyzer are made full use of in the present invention, and in vector net
Two-tone signal is synthesized inside network analyzer, built in bandpass filter, wide-band coupler etc. make the intermodulations of two signals itself
Component is very small, and the harmonics restraint degree in maximum power can achieve -90dBc, so that the test result of third order intermodulation clutter
It is very accurate.Vector network analyzer carries out IMD measurement, and active and receiver all uses same a period of time base, and is in synchronized control,
Therefore very narrow receiver intermediate-frequency bandwidth can be used with further improving measurement accuracy in one frequency point of measurement every time.In addition,
Traditional test scheme is only leveled and is monitored to dual carrier amplitude, and the test link Insertion Loss deviation of dual carrier is had ignored.And this
In inventive method, the calibration of power is carried out to test end face, deviation of the dual carrier on test chain road is had modified, so that dual carrier arrives
Complete constant amplitude when up to satellite interface, and calibrated by vector network analyzer dual-port, system mismatch error, directionality are missed
The multinomial error such as difference, frequency response error, lobe error, instrument error is calibrated, therefore its measuring accuracy is relatively traditional
Testing scheme greatly improves；
(4) calibration process of the invention and third order intermodulation characteristic test process (the uplink signal tune comprising different operating point
Flat process and downlink signal measurement process) it is all to be completed by the algorithm built in vector network analyzer, tester only needs pair
Vector network analyzer and switch matrix carry out relevant parameter configuration, therefore the test automation degree of the method for the present invention is higher,
The robustness of test macro is also stronger compared with legacy system, and artificial participation is low can to make testing reliability and safety higher；
(5) test method of the invention has wider scalability, carries out a variety of sweep using vector network analyzer
The transponder IMD measurement retouched under mode other than scan power, may be used also in addition to keeping dominant frequency and double wave frequency difference constant in the present invention
To keep power and double wave frequency difference constant, scan the centre frequency between two dominant frequency according to some special testing requirements；Or
The centre frequency and power being to maintain between two dominant frequency are constant, scan double wave frequency difference.Under any measurement pattern, vector network
Analyzer receiver can all measure the value of dominant frequency and each intermodulation amount, while calculate and showing that third order intermodulation is special by built-in algorithm
Property.Therefore after present invention extension, it can reflect the nonlinear distortion characteristics of transponder more fully hereinafter from multiple angles.
Detailed description of the invention
Fig. 1 is that the present invention is based on the transponder third order intermodulation test method functional block diagrams of vector network analyzer；
Fig. 2 is inside schematic block diagram of the vector network analyzer of the present invention when testing third order intermodulation；
Fig. 3 is the internal structure block diagram of switch matrix used in the method for the present invention；
Fig. 4 is the calibration process schematic diagram of vector network analyzer in the method for the present invention.
Specific embodiment
In order to solve, traditional third order intermodulation test method low efficiency, test macro error is uncontrollable and test equipment is numerous
More, the problems such as system building is complicated, the invention proposes a kind of using vector network analyzer as the transponder of core test equipment
Third order intermodulation testing scheme.
The test macro that the method for the present invention is related to measures mould with Swept IMD Converters by a PNA-X series
The built-in double source vector network analyzer and a switch matrix group with arrow net test access of formula and 087,083 measurement option
At.Wherein vector network analyzer provides two independent transponder pumping signals, and rapid survey keynote frequency point and mutual frequency modulation
Transponder output signal power at point.Vector network analyzer is fixed double-tone and is swashed using the power testing method of sweeping of frequency conversion IMD
Encourage the frequency point of signal, the power of scanning and excitation signal；The effect of switch matrix is switched by program-controlled internal switch, and vector is completed
The connection of Network Analyzer and different uplinks, downlink satellite-ground link forms complete test loop.
Fig. 1 show the transponder third order intermodulation testing scheme principle frame proposed by the present invention based on vector network analyzer
Figure.The continuous single carrier with fixed frequency interval for generating two constant amplitudes using vector network analyzer is defeated from arrow net PORT1
Out, by switch matrix uplink and upper planet cable enters satellite repeater.Transponder output downlink signal (include
Keynote signal and inter-modulated signal) by lower planet enter arrow net PORT2 after cable and switch matrix downlink, by vector net
Network analyzer receiver measures transponder third order intermodulation characteristic.
Arrow net selects the PNA-X series of Keysight company, and need to have 087,083 option, and arrow net schematic internal view is such as
Shown in Fig. 2.When testing third order intermodulation, the internal two independent driving sources (signal source 1, signal source 2 in Fig. 2) of arrow net pass through interior
It sets mechanical switch (SW in Fig. 2) and is switched to coupler, reference channel power splitter 1 is entered after coupler is combined, function separates all the way
The straight-through road that signal is directly over TCH test channel coupler 1 is exported from PORT1, and the another way that function separates enters reference receiver 1
(A1), to carry out monitoring and power calibration to PORT1 output signal；The input signal of PORT2 by TCH test channel coupler 2 into
Enter test receiver 2 (B2), frequency can be tuned at automatically the center frequency point of two-tone signal by B2 receiver, and setting measurement automatically
Bandwidth, to measure keynote signal and inter-modulated signal simultaneously.Wherein reference receiver 2 (A2), reference channel power splitter 2 are only in signal
Source 1 is switched to from when PORT2 output, just will use.
Switch matrix establishes the company from arrow net test port to whole star difference test port by its internal switching
It connects, is respectively formed multiple complete test loops, avoids tester and surveyed with switching star by frequently replacing cable connection
Try various drawbacks of link.Switch matrix inside principle and each port-mark are as shown in figure 3, it is used in traditional test in the present invention
It is individually designed and increase uplink and downlink vector network analyzer test access (thickened portion in Fig. 3) on the basis of switch matrix.
Uplink swears that net test access increases the RF switch (SW1 in Fig. 3) of one and half steel cables and an alternative, and it is existing to be connected into rear end
Wave beam branch switch (SW2 in Fig. 3), newly-increased arrow test access of surfing the net evaded conjunction in traditional scheme switch matrix
Many radio frequency passive devices such as road device, coupler so that test link is simpler, Insertion Loss is smaller, and also avoid not installing
Matches criteria loads and causes the risk of microwave radiation and link mismatch.Uplink arrow net test access input port be it is newly-increased,
Port-mark is " arrow net A mouthful ", output port be it is original, port-mark is " satellite uplink 1, satellite uplink 2, satellite uplink
3 ..., satellite uplink 6 ".Downlink swears that net test access only increases newly in one RF switch of the multiselect of rear class (SW4 in Fig. 3)
One optional branch, remaining is constant.Downlink swear net test access input port be it is original, port-mark be " satellite downlink 1,
Satellite downlink 2, satellite downlink 3 ..., satellite downlink 6 ", output port be it is newly-increased, port-mark is " arrow net B mouthfuls ".
Improved switch matrix can completely compatible traditional test scheme use in the present invention.
Steps are as follows for realization of the invention:
1, test macro is calibrated
System is connected as align mode first, i.e., by the GPIB mouth and vector network of power meter (only calibration is used) rear panel
Controller mouthfuls of the GPIB (0) of analyzer rear panel is connected, to complete function using vector network analyzer elastic calibration device
Rate acquisition and calibration.Then by the USB interface of the USB interface connected vector Network Analyzer front panel of Electronic Calibration part, for certainly
Dynamic calibration preheats.Then Measurement channel is established in vector network analyzer, Measurement Class is selected as Swept
IMD Converters.Setting channel scan mode is that frequency sweep mode Swept fc (is completed using a frequency sweep calibration to multiple
The calibration in transponder channel) and fixed local oscillator mode, and according to satellite basic parameter vector network analyzer scan upper and lower
Start of line frequency, uplink and downlink terminate frequency, calibration power (being traditionally arranged to be -5dBm), double wave frequency difference (Fixed DeltaF, one
As be set as 1~2MHz), surface sweeping points etc. be configured respectively, wherein the initial range of scan frequency needs to include transponder
All channel frequency ranges.Number of scan points is more as far as possible so that the calibration data that vector network analyzer interpolation obtains be more nearly it is all
The center frequency point in channel, it is authentic and valid.After being completed to the calibration of vector network analyzer with parameter setting, i.e., openable vector
The output of Network Analyzer radio frequency, start frequency scan calibration.
Calibration process is as shown in figure 4, be connected to power meter probe, other end connection for the one end for testing stub cable 1 first
To the port vector network analyzer PORT1, the double source calibration of power is carried out, so that output of the dual carrier signal in test stub cable 1
Hold complete constant amplitude, while automatic calibration reference receiver A1.Then the connecting pin of test stub cable 1 and arrow net PORT1 are kept not
Become, the other end is connected to the PORTA of Electronic Calibration part, while the one end for testing stub cable 2 is connected to arrow net PORT2, separately
One end is connected to the PORTB of Electronic Calibration part, is automatically performed Two-port netwerk SC parametric calibration, can obtain B2 by calibration data and connect
The response of receipts machine.
Vector network analyzer has built-in scanning IMD calibration algorithm, and tester only need to connect power by above-mentioned steps
Meter and Electronic Calibration part, entire calibration process are netted internal automatic control by arrow completely and are completed.Finally by the TCH test channel after the completion of calibration
The .csa file being stored as inside arrow net, in case being called when follow-up test.
2, system testing link is connected
After completing test macro calibration, so that it may build system testing link.
Arrow net PORT1 is connected to before switch matrix by having carried out the test stub cable 1 of calibration in step 1 first
" A mouthfuls of arrow net " input port on plate, arrow net PORT2 is connected to by having carried out the test stub cable 2 of calibration in step 1
" B mouthfuls of arrow net " output port on switch matrix front panel.Then long cable (usually 8~12 meters) by upper planet is tested
Both ends are connected to the corresponding uplink on the input test coupler straightthrough port and switch matrix rear panel of transponder to be measured respectively
Beam port (" satellite uplink 1 " or " satellite uplink 2 " or ... or " satellite uplink 6 ")；By lower planet test long cable (usually
Be 8~12 meters) both ends be connected to the output test coupler coupling aperture of transponder to be measured respectively (straightthrough port connect high-power absorption
Load) and switch matrix rear panel on corresponding downlink wave beam port (" satellite downlink 1 " or " satellite downlink 2 " or ... or " defend
Star downlink 6 ").In addition, " frequency spectrograph " port (i.e. downlink coupling tributary port) on switch matrix front panel needs to terminate
Matched load.All cable connections need to be fastened with standard torque spanner in system.It is as shown in Figure 1 to test link connection block diagram.
3, third order intermodulation is tested
It, can official testing transponder third order intermodulation spy after completing test macro calibration and test link connection
Property.Firstly, the .csa calibration environment stored in invocation step 1 in vector network analyzer.Then it will currently measure logical
The scanning mode in road is changed to power scan (Power Swept) by frequency scanning, and sweeps power completion single channel transponder with utilization and exists
The third order intermodulation characteristic test of different operating point.Then vector network analyzer is carried out according to the basic parameter for being tested transponder
Test parameter configuration:
(1) according to test benchmark (output power of corresponding arrow net PORT1 when transponder being pushed away saturation, this numerical value by
The measurement result of other test items of transponder obtains) and technological document as defined in transponder Test input signal power model
It encloses, calculates the power scan range that arrow nets internal double source.For example, if the test benchmark of certain transponder to be measured is that -10dBm (is sweared
When net PORT1 output power is -10dBm, transponder can just be pushed by uplink test link into transponder by signal
It is saturated operating point), technological document provides that the input power range of road transponder third order intermodulation test retracts for saturation input
10dB to supersaturated 3dB, then arrow net PORT1 output power range just should be -20dBm to -7dBm, and because PORT1 is exported
Be constant amplitude dual carrier, therefore each carrier power is both needed to the 3dB that retracts again, i.e., the power scan range in two sources is -23dBm
To -10dBm；Finally by be calculated two source power scanning ranges in Swept IMDX Setup → Tone Power into
Row setting.
(2) according to transponder relevant parameter is tested, arrow is set in Swept IMDX Setup → Mixer Frequency
Centre frequency between net output dual carrier dominant frequency, the uplink center frequency point in as tested transponder channel；Local frequency is set,
The conversion frequency in i.e. tested transponder channel；Centre frequency between arrow net input dual carrier dominant frequency, as tested forwarding are set
The downlink center frequency point in device channel.
(3) double wave frequency difference (Fixed DeltaF) is set in Swept IMDX Setup → Tone Frequency, i.e.,
Export the frequency interval of dual carrier.If frequency interval is too narrow, the phase noise of driving source is possible to flood intermodulation component.Frequently
If rate interval is too wide, intermodulation component is possible to fall into outside the band of transponder channel, and being suppressed accurately to measure.Therefore dominant frequency is double
Wave frequency rate interval need to compromise consideration, be traditionally arranged to be 1~2MHz, and need the same with setting value when step 1 alignment；
(4) dominant frequency signal is set in Swept IMDX Setup → Tone Frequency and receives intermediate-frequency bandwidth (Main
Tone IFBW) and inter-modulated signal reception intermediate-frequency bandwidth (IM Tone IFBW).In the present invention, the intermediate-frequency bandwidth of dominant frequency and mutually
Adjusting the intermediate-frequency bandwidth of signal can be respectively set, therefore can do on measuring accuracy and test speed and compromise that (intermediate-frequency bandwidth is got over
Narrow, measurement result is more accurate, but test speed is slower).Main Tone IFBW is set as 100KHz (dominant frequency letter under normal circumstances
It is number larger, be easy to survey quasi-), IM Tone IFBW is set as 1KHz (intermodulation signal is smaller, and standard can not be surveyed if intermediate frequency is wider)；
(5) in Measure, setting measurement result display format is IM3；
(6) embedded local oscillator following function (Embedded LO) is opened, it is uncertain with the measurement of with reducing star frequency deviation bring
Degree.
After setting completed to measurement parameter, radio-frequency power output is finally opened, is started by vector network analyzer inside certainly
Third order intermodulation characteristic test under main completion power scan.
Vector network analyzer does complete power scan third order intermodulation measurement by built-in application function, therefore can
To measure and show the power of all dominant frequency and intermodulation component in a Measurement channel, while calculating automatically all required
The third order intermodulation characteristic of operating point, and finally draw out the third order intermodulation characteristic trace under power scan mode.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (2)
1. a kind of transponder third order intermodulation test method based on vector network analyzer, it is characterised in that include the following steps:
(1) the built-in double source vector network analyzer and one that one has Swept IMD Converters measurement pattern are chosen
Switch matrix with vector network analyzer test access is as test equipment；The vector network analyzer test access
Including uplink and downlink, for the input port of uplink labeled as A mouthfuls of arrow net, which is connected directly to the uplink inside switch matrix
The input of beam port, the output port of uplink are the output of the uplink beam port；The input port of downlink is cubicle switchboard
The input of downlink wave beam port inside battle array, for the output port of downlink labeled as B mouthfuls of arrow net, which is inside switch matrix
The output optional all the way of one RF switch of multiselect；
(2) calibration is performed a scan to vector network analyzer, and the TCH test channel after the completion of calibration is stored as vector net
.csa file inside network analyzer；
(3) PORT1 of vector network analyzer is connected to A mouthfuls of arrow net of switch matrix, by the PORT2 of vector network analyzer
It is connected to B mouthfuls of arrow net, by upper planet test cable both ends are connected to the input test coupler straightthrough port of transponder to be measured respectively
With the uplink beam port of switch matrix, by lower planet the both ends of test cable are connected to the output test of transponder to be measured respectively
The downlink wave beam port of coupler coupling aperture and switch matrix；
(4) stored .csa calibration environment is called in vector network analyzer, and by the scanning mode of current Measurement channel
Power scan is changed to by frequency scanning, test parameter is carried out to vector network analyzer according to the basic parameter of tested transponder and is matched
It sets, including centre frequency, the local oscillator inside vector network analyzer between the power scan range of double source, output dual carrier dominant frequency
Centre frequency, double wave frequency difference between frequency, input dual carrier dominant frequency, dominant frequency signal receive intermediate-frequency bandwidth and inter-modulated signal connects
Receive intermediate-frequency bandwidth；
(5) the radio-frequency power output for opening vector network analyzer, completes three ranks under power scan by vector network analyzer
Intermodulation characteristic test.
2. a kind of transponder third order intermodulation test method based on vector network analyzer according to claim 1, special
Sign is: the method for performing a scan calibration to vector network analyzer in the step (2) are as follows: will test stub cable 1
One end be connected to power meter probe, the other end is connected to the port vector network analyzer PORT1, carry out the double source calibration of power,
So that output end complete constant amplitude of the dual carrier signal in test stub cable 1, while automatic calibration reference receiver A1；Then it keeps
The connecting pin for testing stub cable 1 and vector network analyzer PORT1 is constant, and the other end is connected to the PORTA of Electronic Calibration part,
The one end for testing stub cable 2 is connected to vector network analyzer PORT2 simultaneously, the other end is connected to Electronic Calibration part
PORTB completes Two-port netwerk SC parametric calibration, and the response of B2 receiver is obtained by calibration data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611118307.7A CN106656306B (en) | 2016-12-07 | 2016-12-07 | A kind of transponder third order intermodulation test method based on vector network analyzer |
Applications Claiming Priority (1)
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| CN108521309B (en) * | 2018-06-08 | 2020-09-01 | 中国电子科技集团公司第四十一研究所 | System and method for testing frequency sweep intermodulation distortion |
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| CN109239636A (en) * | 2018-11-16 | 2019-01-18 | 中电科仪器仪表有限公司 | Vector network analyzer Electronic Calibration part based on more impedance states |
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