CN105897348A - Residual passive intermodulation test method - Google Patents
Residual passive intermodulation test method Download PDFInfo
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- CN105897348A CN105897348A CN201410775300.7A CN201410775300A CN105897348A CN 105897348 A CN105897348 A CN 105897348A CN 201410775300 A CN201410775300 A CN 201410775300A CN 105897348 A CN105897348 A CN 105897348A
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Abstract
The present invention provides a residual passive intermodulation test method. The residual passive intermodulation test method comprises: performing self calibration of the system for testing so as to satisfy a presetting test requirement; scanning the background in a testing place so as to check and remove other interferences; performing calibration of the radiation power density of the system for testing according to the max radiation power density of the position where a satellite to be measured is located so as to allow the radiation power density of the system for testing to reach the level of the max radiation power density; and sampling and obtaining the max radiation power density of the satellite to be measured at different positions relative to the different positions in the testing field, and correspondingly obtaining different radiation power densities of the system for testing so as to obtain relatively stable radiation power density reading. According to the invention, an appropriate wireless test system is built and is calibrated so as to ensure that the passive intermodulation index of the satellite test environment reaches the requirement of the satellite passive intermodulation test, and therefore, the test result authenticity is ensured and the test error influence is decreased.
Description
Technical field
The invention belongs to satellite test field, relate to satellite test environment residue passive cross modulation test scheme, more particularly, to
A kind of residue passive cross modulation test method, it is adaptable to satellite test environment is remained the assessment test of passive intermodulation.
Background technology
Passive intermodulation (Passive Inter Modulation, hereinafter referred to as PIM) test is little uncertain with it due to test magnitude,
Its measurement is extremely difficult." passive intermodulation is measured and solution " in 9th phase " telecommunication technology " in 2007 is mentioned: for
Common microwave passive Two-port netwerk device, can produce intermodulation product, common survey while two high-power signals under acting on
Metering method can be tested by the measuring method of forward and reflection intermodulation product.
The CN1870473 patent " passive intermodulation testing method of mobile communication base station system " of Huawei Company discloses one
Passive intermodulation testing method of mobile communication base station system, presses preset mode transmitting test signal, simultaneously by controlling transmitter
Control receiver to receive in test frequency range interscan, and dock to collect mail and number carry out spectrum analysis to evaluate overall passive of base station system
Intermodulation performance, accurately calculates received survey by parameters such as known carrier frequency scope, intermodulation exponent number and reception frequency ranges
Examination frequency range, and use the mode of scanning transmitting and reception continuous wave to improve test signal receiving quality.
But, there is following limitation in two kinds of above-mentioned method of testings.
First, both PIM method of testings all carry out passive cross modulation test for individual devices or system, and mainly pass through
Wire cable is tested, and the most not mentioned under wireless test environment, how to be estimated place.
Secondly, the PIM for test site, especially satellite test environment measures, and the assessment of its residue passive intermodulation magnitude is still
Without ripe method.The mechanism that passive intermodulation produces is extremely complex, and passive cross modulation test may be affected by many factors, removes
The PIM that measured piece itself produces, it is also possible to be the place PIM that is exposed to that aerial radiation region produces.
When carrying out passive cross modulation test, whether the residue passive intermodulation of test site meets the requirement of passive cross modulation test is this survey
The precondition whether examination can be carried out.Test site must meet the strictest residue passive intermodulation index.
Therefore, it is badly in need of a kind of satellite test environment residue passive cross modulation test scheme, other various test environments can be applied to
Residue passive intermodulation assessment test.
Summary of the invention
In order to solve problems of the prior art, and then overcoming the limitation that existing testing scheme exists, the present invention proposes
A kind of residue passive cross modulation test scheme, it is possible in darkroom or when carrying out satellite passive cross modulation test in other places, to test
The residue passive intermodulation in place is estimated test, to environment PIM index request during to meet satellite self passive cross modulation test.
The invention provides a kind of residue passive cross modulation test method, for the residue under satellite test environment, to test site
Passive intermodulation degree of stability is estimated test.The method comprises the following steps: step one, carries out self calibration to surveying trial system,
Thus meet presumptive test requirement；Step 2, is scanned the background in test site, thus investigates and remove at checkout area
Other in addition to presumptive test interference in ground；Step 3, according to the maximum radiated power density of satellite position to be measured, to survey
The radiosity of trial system is calibrated, so that surveying the radiosity of trial system, to reach maximum radiated power close
The level of degree；And step 4, relative to the diverse location in test site, sampling obtains satellite to be measured at diverse location
Large radiation power density, and obtain the different radiosities surveying trial system accordingly, thus obtain metastable radiation
Power density reading.
Step one performs: build survey trial system；Trial system is surveyed in calibration, so that it meets presumptive test requirement；And
Passive intermodulation source the connectedness of exact p-value system is added before surveying trial system.
Specifically, in step one, calibration is surveyed the step of trial system and is included: calibration is at the intrasystem each section of cable of test
Insert loss and antenna are in the gain testing frequency range；And the incoming level of amplifier in calibration test system is carried out by energy meter,
So that it is guaranteed that the reading of energy meter meets the power density that need to radiate, wherein, presumptive test requires at least to include: measured power is wanted
Ask, test frequency requirement, test dynamic range requirement and measuring accuracy requirement.
It addition, count passive intermodulation source and confirm connectedness step include: test with add before intrasystem antenna passive mutually
Tune source；Two carrier waves are launched according to power to be tested and frequency；Survey at the frequency of predetermined passive intermodulation to be calculated
Amount；When receiving the product of passive intermodulation, survey the connective normal of trial system；And the product of passive intermodulation ought not received
During thing, check again for surveying trial system and confirm.
Step 2 performs: by setting up test antenna, check whether the periphery at test site exists at other unrelated equipment
In open state；And using vertical polarization and the polarization mode of horizontal polarization combination, the background measured in test site is laid equal stress on
Point record is beyond the signal frequency of limit value, thus the external interference that investigation is unrelated with presumptive test.
Specifically, step 3 includes: according to satellite to be measured in the concrete putting position of test site and state, sets antenna from week
The distance of ripple wall is inhaled on limit；According to the field distribution of antenna, the aperture field of estimation antenna is radiated to inhale the area of ripple wall；And determine sky
Line arrives the maximum power density of the periphery of test site.
Extraly, step 3 also includes: adjust and put antenna adaptively, thus the wall of preresearch estimates antenna and test site
Distance between face；Correspondingly calibration is radiated to inhale the power density of ripple wall, so that it is close with the power of the actual emanations of satellite
Spend the most suitable；And when searching out the power density being radiated to suction ripple wall not less than the survey of the power density of the actual emanations of satellite
During pilot, the radiosity of exact p-value system has been demarcated.
Step 4 performs: putting position based on the intrasystem test antenna of test is around the different angles of whole test site
Degree, sampling obtains a series of residue passive intermodulation value；And record is in the residue passive intermodulation value of each exponent number of each angle,
And observe the scheduled time, thus obtain metastable power reading.
It addition, also include according to the residue passive cross modulation test method of the present invention: in the given time, pre-determined number ground is to test
Place is demarcated, thus draws corresponding power data；According to test result test site improved and adjust, thus
Guarantee to meet presumptive test requirement；Meansigma methods and the burst of record residue passive intermodulation simultaneously is shown in peak value, as record result；Root
According to the result of background scans, reject outlier；When component frequency product is not inconsistent predetermined technique requirement, close passive intermodulation source Lai Guan
Examine whether frequency products yet suffers from；And after getting rid of abnormal problem, record stable passive intermodulation result as final result.
Therefore, use the residue passive cross modulation test scheme of the present invention, can obtain following beneficial effect:
(1) used for reference the passive cross modulation test method of wired Two-port netwerk device, simultaneously take account of the passive cross modulation test of satellite without
Thread environment, establishes suitable wireless test system, and is calibrated test system；
(2) according to satellite actual test required for power density, carried out wireless power density calibration, such scaling method
Can ensure that the passive intermodulation index of satellite test environment reaches the requirement of satellite passive cross modulation test；And
(3) according to the feature of passive cross modulation test, in conjunction with satellite putting position, environment has been carried out Multidirectional sweeping, used simultaneously
Repeatedly stable measurement, and combine the result of background environment scanning, it is ensured that the verity of test result, reduce test by mistake
The impact of difference.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of the system self-calibration procedure of the specific embodiment of the invention；
Fig. 2 is the schematic diagram of the satellite passive cross modulation test state of the specific embodiment of the invention；And
Fig. 3 is the flow chart of the satellite test environment residue passive cross modulation test work of the specific embodiment of the invention.
Detailed description of the invention
It will be appreciated that the main testing procedure of the residue passive cross modulation test method of the satellite test environment of the present invention includes: test system
System self calibration, background scans, radiosity calibration, assessment test and stable measurement.
Wherein, test system self-calibration includes: after test system building completes, the demarcation of power and the inspection of system connectivity,
Meanwhile, utilize PIM source verifying test system normal in corresponding PIM frequency function.
Radiosity calibration includes: the radiosity of satellite calculates, and needs the test mode combining satellite to obtain satellite
The maximum radiated power density of position, then, according to the maximum radiated power density obtained, the radiation merit to test system
Rate density is calibrated, and makes the radiosity of test antenna reach satellite maximum radiated power level of density.
Below in conjunction with the accompanying drawings and detailed description of the invention the present invention is described in detail.Fig. 1 is the schematic block of system self-calibration procedure
Figure, Fig. 2 is the schematic diagram of satellite passive cross modulation test state, and Fig. 3 is the residue passive cross modulation test work of satellite test environment
Flow chart.
The testing process of the present invention is as shown in Figure 3.It follows that will with reference to Fig. 3, by test system self-calibration, background scans,
The present invention is described in detail by the flow process order of radiosity calibration, assessment test and stable measurement.
Test system self-calibration
In order to meet the requirement of place residue passive intermodulation, system first must be made to meet frequency and the merit of regulation in test condition
Rate and test dynamic range and required precision.Should each section of cable of calibration insert loss and antenna test frequency range gain,
By power meter calibration amplifier input level, it is ensured that energy meter reading disclosure satisfy that the power density needing radiation
Pd(mW/cm2)。
Secondly, as it is shown in figure 1, after system building completes, add PIM source before antenna, simultaneously according to the frequency of setup test
Rate and two carrier waves of power emission.Then, measure at the frequency being calculated PIM.If being able to receive that PIM product,
Then proof system is connective normal, otherwise, then need PIM test system is reexamined.
Background scans
First, under the state that ground installation powers up, frock is all on board, set up test antenna, check that place periphery is with or without it
He starts shooting at unrelated equipment.
It follows that background in measurement place, polarization mode is vertical polarization and horizontal polarization, and emphasis record is beyond the signal of limit value
Frequency.Other external interference of this test predominantly investigation place passive cross modulation test.
Radiosity is calibrated
First, should be according to satellite in the concrete putting position of test site and state.As illustrated in fig. 2, it is assumed that its antenna is from periphery
The distance inhaling ripple wall is d1、d2、d3、d4.The radiant power assuming 4 width antenna porch is P1、P2、P3、P4, according to sky
The field distribution of line, estimate respectively according to below equation antenna aperture field be radiated to inhale ripple wall area:
Pd=P/S
Wherein, P is antenna radiated power, and S is the area that radiation value inhales ripple wall.Therefore, it is possible to determine arrival test site periphery
Maximum power density Pdmax(mW/cm2) (assume that antenna power is the most break-even and be radiated to this region).Wherein,
Pdmax=max (Pd1, Pd2, Pd3, Pd4)。
It follows that the radiant power that the radiant power of test is actual with satellite during in order to make place assess when testing is suitable, it is necessary to school
The power density that standard is radiated to inhale ripple wall is suitable with the power density of satellite actual emanations.Can estimate to survey by field intensity survey meter
Examination antenna arrives the power inhaling ripple wall.Certainly, this test antenna and metope put distance can also preresearch estimates in advance, pass through
Suitable adjustment and putting, so that radiosity Psys≥Pdmax.When searching out this test point, it is believed that power is close
Scale completes surely.
Assessment test
First, in order to the most comprehensively assessment place remains the test result of passive intermodulation, need to obtain a series of hits
According to.Assume that the test days string pendulum in place sets position centered by position, can be with scan ring around totally 8 angles, 0 °～360 ° of whole place
The residue passive intermodulation value of degree (0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 °).
Then, record the PIM value of each exponent number of each angle, note observing about 10 minutes, thus obtain more steady
Fixed power reading.
Stable measurement
Due to the unstability of passive cross modulation test, before whole star PIM test should within a period of time (a day) repeatedly (5～10
Secondary) test site is demarcated, after obtaining corresponding data, according to test result place improved or adjust, it is ensured that
When place and test, all of frock and ground checkout equipment all can meet the requirement of passive cross modulation test.Should record simultaneously passive mutually
The meansigma methods adjusted and sudden peaks value are as record result.
According to the result of background scans, reject outlier.If the frequency products still having part not to be inconsistent with technical result, then close letter
Behind number source, observed frequency product the most still exists.After getting rid of above abnormal problem, record the final of passive intermodulation stable measurement
Result.
It will be appreciated that the method for testing of the satellite test environment residue passive intermodulation of the present invention is successfully applied to multiple nothing at present
Line is measured in the assessment test of environment, and according to the passive intermodulation index magnitude of satellite reality, the residue having demarcated place is passive mutually
Tone pitch.
In sum, use technical scheme, establish suitable wireless test system and test system has been carried out school
Accurate, it is ensured that the passive intermodulation index of satellite test environment reaches the requirement of satellite passive cross modulation test, ensure that test knot
The verity of fruit also reduces the impact of test error.
Undeclared in the present invention partly belong to techniques known.
Claims (10)
1. a residue passive cross modulation test method, for the residue passive intermodulation under satellite test environment, to test site
Degree of stability is estimated test, it is characterised in that comprise the following steps:
Step one, carries out self calibration to surveying trial system, thus meets presumptive test requirement；
Step 2, is scanned the background in described test site, thus investigates and remove in described test site except pre-
Other interference outside location survey examination；
Step 3, according to the maximum radiated power density of satellite position to be measured, the radiant power to described survey trial system
Density is calibrated, so that the radiosity of described survey trial system reaches the water of described maximum radiated power density
Flat；And
Step 4, relative to the diverse location in described test site, sampling obtains described satellite to be measured at diverse location
Large radiation power density, and obtain the different radiosities of described survey trial system accordingly, thus obtain the most steady
Fixed radiosity reading.
Residue passive cross modulation test method the most according to claim 1, it is characterised in that perform in described step one:
Build described survey trial system；
Calibrate described survey trial system, so that it meets described presumptive test requirement；And
Before described survey trial system, add passive intermodulation source and confirm the connectedness of described survey trial system.
Residue passive cross modulation test method the most according to claim 2, it is characterised in that in described step one, institute
The step stating calibration survey trial system includes:
Calibration is lost with antenna in the gain testing frequency range in the described test insert of intrasystem each section of cable；And
The incoming level of the intrasystem amplifier of described test is calibrated by energy meter, so that it is guaranteed that the reading of described energy meter
Meet the power density that need to radiate,
Wherein, described presumptive test requires at least to include: measured power requires, test frequency requirement, test dynamic range are wanted
Ask and measuring accuracy requirement.
Residue passive cross modulation test method the most according to claim 2, it is characterised in that in described step one, institute
State and count passive intermodulation source and confirm that the step of connectedness includes:
In described test with adding described passive intermodulation source before intrasystem antenna；
Two carrier waves are launched according to power to be tested and frequency；
Measure at the frequency of predetermined passive intermodulation to be calculated；
When receiving the product of described passive intermodulation, the connectedness of described survey trial system is normal；And
When not receiving the product of described passive intermodulation, described survey trial system is checked again for and confirms.
Residue passive cross modulation test method the most according to claim 1, it is characterised in that perform in described step 2:
By setting up test antenna, check that whether there are other unrelated equipment at the periphery of described test site is in start shape
State；And
The polarization mode using vertical polarization and horizontal polarization to combine, measures the background in described test site emphasis record
Beyond the signal frequency of limit value, thus the external interference that investigation is unrelated with presumptive test.
Residue passive cross modulation test method the most according to claim 1, it is characterised in that described step 3 includes:
According to described satellite to be measured in the concrete putting position of described test site and state, set antenna and inhale ripple wall from periphery
Distance；
According to the field distribution of described antenna, estimate that the aperture field of described antenna is radiated to the area of described suction ripple wall；And
Determine that described antenna arrives the maximum power density of the periphery of described test site.
Residue passive cross modulation test method the most according to claim 6, it is characterised in that described step 3 also includes:
Adjust and put described antenna adaptively, thus between the metope of antenna described in preresearch estimates and described test site
Distance；
Correspondingly calibration is radiated to the power density of described suction ripple wall, so that it is close with the power of the actual emanations of described satellite
Spend the most suitable；And
When searching out the survey not less than the power density of the actual emanations of described satellite of the power density that is radiated to described suction ripple wall
During pilot, confirm that the radiosity of described survey trial system has been demarcated.
Residue passive cross modulation test method the most according to claim 1, it is characterised in that perform in described step 4:
Based on described test with the putting position of intrasystem test antenna around the different angles of whole test site, sampling obtains
Obtain a series of residue passive intermodulation value；And
Record is in the described residue passive intermodulation value of each exponent number of each angle, and observes the scheduled time, thus obtains relatively
Stable power reading.
Residue passive cross modulation test method the most according to claim 1, it is characterised in that also include:
In the given time, described test site is demarcated pre-determined number, thus draw corresponding power data；
According to test result, described test site is improved and adjusts, so that it is guaranteed that meet described presumptive test requirement；With
And
Peak value is shown in the meansigma methods and the burst that record described residue passive intermodulation simultaneously, as record result.
Residue passive cross modulation test method the most according to claim 9, it is characterised in that also include:
According to the result of described background scans, reject outlier；
When component frequency product is not inconsistent predetermined technique requirement, closes passive intermodulation source and observe described frequency products the most still
Exist；And
After getting rid of abnormal problem, record stable passive intermodulation result as final result.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465442A (en) * | 2017-08-01 | 2017-12-12 | 常熟市泓博通讯技术股份有限公司 | The control method and module of multi-antenna arrangement |
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| WO2014085345A1 (en) * | 2012-11-30 | 2014-06-05 | P-Wave Holdings, Llc | Built-in passive intermodulation detector for base station equipment |
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2014
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| CN107465442A (en) * | 2017-08-01 | 2017-12-12 | 常熟市泓博通讯技术股份有限公司 | The control method and module of multi-antenna arrangement |
| CN107465442B (en) * | 2017-08-01 | 2023-08-22 | 常熟市泓博通讯技术股份有限公司 | Control method and module of multi-antenna device |
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