CN105897348B - Remaining passive cross modulation test method - Google Patents
Remaining passive cross modulation test method Download PDFInfo
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- CN105897348B CN105897348B CN201410775300.7A CN201410775300A CN105897348B CN 105897348 B CN105897348 B CN 105897348B CN 201410775300 A CN201410775300 A CN 201410775300A CN 105897348 B CN105897348 B CN 105897348B
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Abstract
The present invention provides a kind of remaining passive cross modulation test methods comprising: self calibration is carried out to trial system is surveyed, to meet presumptive test requirement；Background in test site is scanned, to check and remove other interference；According to the maximum radiated power density of satellite to be measured position, the radiosity for surveying trial system is calibrated, so that the radiosity for surveying trial system be made to reach the level of maximum radiated power density；Relative to the different location in test site, sampling obtains satellite to be measured in the maximum radiated power density of different location, and accordingly obtains the different radiosities for surveying trial system, to obtain metastable radiosity reading.Therefore, it using the present invention, establishes suitable wireless test system and it is calibrated, guarantee that the passive intermodulation index of satellite test environment reaches the requirement of satellite passive cross modulation test, so that it is guaranteed that the authenticity of test result and reducing the influence of test error.
Description
Technical field
The invention belongs to satellite test fields, are related to satellite test environment residue passive cross modulation test scheme, more specifically,
It is related to a kind of remaining passive cross modulation test method, the assessment suitable for the remaining passive intermodulation to satellite test environment is tested.
Background technique
Passive intermodulation (Passive Inter Modulation, hereinafter referred to as PIM) test is since test magnitude is small and it
Uncertainty measures extremely difficult." passive intermodulation measurement and solution " in 9th phase " telecommunication technology " in 2007 mentions
It arrives: for common microwave passive Two-port netwerk device, generating intermodulation product under can acting on while two high-power signals,
Common measurement method can be tested by positive and reflection intermodulation product measurement method.
The CN1870473 patent " passive intermodulation testing method of mobile communication base station system " of Huawei Company discloses
A kind of passive intermodulation testing method of mobile communication base station system, by control transmitter by preset mode transmitting test letter
Number, while controlling and receiving machine and scanning reception in test frequency range, and spectrum analysis is carried out to reception signal to evaluate base station system
Whole passive inter-modulation performance is accurately counted by parameters such as known carrier frequency range, intermodulation order and reception frequency ranges
The received test frequency range of institute is calculated, and improves test signal receiving quality by the way of scanning transmitting and reception continuous wave.
However, the following limitations exist for two kinds of above-mentioned test methods.
Firstly, both PIM test methods are directed to individual devices or system to carry out passive cross modulation test, and main
It is tested, and is not referred to for how to assess place under wireless test environment by wire cable.
Secondly, especially the PIM measurement of satellite test environment, remaining passive intermodulation magnitude are commented for test site
Estimate and there is no mature method.The mechanism that passive intermodulation generates is extremely complex, and passive cross modulation test may be by the shadow of many factors
It rings, the PIM generated in addition to measured piece itself, it is also possible to be the PIM that place is exposed to the generation of aerial radiation region.
When carrying out passive cross modulation test, whether the remaining passive intermodulation of test site meets the requirement of passive cross modulation test
It is the precondition for testing whether to be able to carry out.Test site must meet very strict remaining passive intermodulation index.
Therefore, it is badly in need of a kind of satellite test environment residue passive cross modulation test scheme, other various surveys can be applied to
The remaining passive intermodulation in test ring border assesses test.
Summary of the invention
In order to solve the problems in the existing technology, and then overcome limitation existing for existing testing scheme, the present invention
A kind of remaining passive cross modulation test scheme is proposed, satellite passive cross modulation test can be carried out in darkroom or in other places
When, assessment test is carried out to the remaining passive intermodulation of test site, to environment PIM when meeting satellite itself passive cross modulation test
Index request.
The present invention provides a kind of remaining passive cross modulation test methods, are used under satellite test environment, to test site
Remaining passive intermodulation stability carry out assessment test.Method includes the following steps: step 1, carries out certainly to trial system is surveyed
Calibration, to meet presumptive test requirement；Step 2 is scanned the background in test site, to check and remove
Other interference in test site in addition to presumptive test；Step 3, the maximum radiated power according to satellite to be measured position are close
Degree calibrates the radiosity for surveying trial system, so that the radiosity for surveying trial system be made to reach maximum
The level of radiosity；And step 4, relative to the different location in test site, sampling obtains satellite to be measured not
With the maximum radiated power density of position, and the different radiosities for surveying trial system are accordingly obtained, to obtain phase
Stable radiosity is read.
It is executed in step 1: building survey trial system；Calibration test system, so that it meets presumptive test requirement；
And the connectivity of passive intermodulation source and exact p-value system is added before surveying trial system.
Specifically, in step 1, the step of calibration test system includes: calibration in each section of electricity surveyed in trial system
The borrowing loss of cable and antenna are in the gain for testing frequency range；And by power meter come the defeated of the amplifier in calibration test system
Enter level, so that it is guaranteed that the reading of power meter meets the power density that need to be radiated, wherein presumptive test requires to include at least: surveying
Try power requirement, test frequency requires, test dynamic range requirement and measuring accuracy require.
In addition, being included in passive intermodulation source and including: to be added before the antenna surveyed in trial system the step of confirming connectivity
Passive intermodulation source；Emit two carrier waves according to power and frequency to be tested；In the frequency point of scheduled passive intermodulation to be calculated
Place measures；When receiving the product of passive intermodulation, the connectivity for surveying trial system is normal；And it ought not receive passive
When the product of intermodulation, survey trial system is checked again for and confirmed.
It is executed in step 2: testing antenna by setting up, checked unrelated with the presence or absence of other on the periphery of test site
Equipment is in open state；And the polarization mode combined using vertical polarization and horizontal polarization, it measures in test site
Background and emphasis record exceed the signal frequency of limit value, thus the external interference that investigation is unrelated with presumptive test.
Specifically, step 3 includes: to set antenna in the specific placement position of test site and state according to satellite to be measured
It is inhaled with a distance from wave wall from periphery；According to the field distribution of antenna, estimate that the aperture field of antenna is radiated to the area for inhaling wave wall；And really
Determine the maximum power density that antenna reaches the periphery of test site.
Extraly, step 3 further include: antenna is adaptively adjusted and put, thus preresearch estimates antenna and test site
The distance between metope；Correspondingly calibration is radiated to the power density for inhaling wave wall, to make itself and the actual emanations of satellite
Power density is at least suitable；And power of the power density for inhaling wave wall not less than the actual emanations of satellite is radiated to when searching out
When the test point of density, the radiosity of exact p-value system, which is demarcated, to be completed.
Execute in step 4: the placement position based on the test antenna surveyed in trial system is around entire test site
Different angle, sampling obtain a series of remaining passive intermodulation value；And it is recorded in the remaining nothing of each order of each angle
The mutual tone pitch in source, and the predetermined time is observed, to obtain metastable power reading.
In addition, residue passive cross modulation test method according to the present invention further include: in the given time, pre-determined number it is right
Test site is demarcated, to obtain corresponding power data；Test site is improved and is adjusted according to test result,
So that it is guaranteed that meeting presumptive test requirement；It records the average value of remaining passive intermodulation simultaneously and peak value is shown in burst, tied as record
Fruit；According to background scans as a result, rejecting outlier；When component frequency product, which is not inconsistent predetermined technique, to be required, passive intermodulation is closed
Source comes whether observed frequency product still has；And after excluding abnormal problem, stable passive intermodulation result conduct is recorded
Final result.
Therefore, using remaining passive cross modulation test scheme of the invention, can obtain it is following the utility model has the advantages that
(1) the passive cross modulation test method of wired Two-port netwerk device has been used for reference, while having considered the passive intermodulation of satellite
Wireless environment is tested, establishes suitable wireless test system, and calibrated to test macro；
(2) power density according to required for satellite actual test has carried out wireless power density calibration, such calibration
Method can guarantee that the passive intermodulation index of satellite test environment reaches the requirement of satellite passive cross modulation test；And
(3) according to passive cross modulation test the characteristics of, has carried out Multidirectional sweeping to environment in conjunction with satellite placement position, simultaneously
Using multiple stable measurement, and combine the result of background environment scanning, it is ensured that the authenticity of test result reduces survey
Try the influence of error.
Detailed description of the invention
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.
Specific embodiment
It will be appreciated that the main testing procedure of the remaining passive cross modulation test method of satellite test environment of the invention includes:
Test macro self calibration, background scans, radiosity calibration, assessment test and stable measurement.
Wherein, test macro self calibration includes: after the completion of test macro is built, the calibration of power and system connectivity
It checks, meanwhile, it is normal in corresponding PIM frequency point function using the source PIM verifying test system.
Radiosity calibration includes: that the radiosity of satellite calculates, and the test mode in conjunction with satellite is needed to obtain
To the maximum radiated power density of satellite position, then, according to obtained maximum radiated power density, to test macro
Radiosity is calibrated, and the radiosity for testing antenna is made to reach satellite maximum radiated power level of density.
With reference to the accompanying drawing and specific embodiment the present invention is described in detail.Fig. 1 is system self-calibration procedure
Schematic block diagram, Fig. 2 are the schematic diagrames of satellite passive cross modulation test state, and Fig. 3 is satellite test environment residue passive cross modulation test
The flow chart of work.
Testing process of the invention is as shown in Figure 3.Next, will refer to Fig. 3, by test macro self calibration, background scans,
The process sequence of radiosity calibration, assessment test and stable measurement describes to the present invention in detail.
Test macro self calibration
In order to meet the requirement of place residue passive intermodulation, system must be made to meet frequency specified in test condition first
Rate and power and test dynamic range and required precision.Should each section of cable of calibration borrowing loss and antenna test frequency
It is close to guarantee that power meter reading can satisfy the power for needing to radiate by power meter calibration amplifier input level for the gain of section
Spend Pd(mW/cm2)。
Secondly, as shown in Figure 1, the source PIM is added before antenna, while according to setup test after the completion of system building
Two carrier waves of frequency and power emission.Then, it is measured in the frequency point that PIM is calculated.If PIM product can be received,
Then proof system connectivity is normal, conversely, then needing to reexamine PIM test macro.
Background scans
Firstly, setting up test antenna in the state that ground installation has been powered on, tooling is all on board, check that place periphery has
No other unrelated equipments booting.
Next, background in measurement place, polarization mode is vertical polarization and horizontal polarization, and emphasis record is beyond limit value
Signal frequency.The test is mainly to check other external interferences of place passive cross modulation test.
Radiosity calibration
Firstly, should be according to satellite in the specific placement position of test site and state.As illustrated in fig. 2, it is assumed that its antenna from
The distance that wave wall is inhaled on periphery is d1、d2、d3、d4.Assuming that the radiant power of 4 width antenna inlet is P1、P2、P3、P4, according to antenna
Field distribution, according to the following formula respectively estimation antenna aperture field be radiated to inhale wave wall area:
Pd=P/S
Wherein, P is antenna radiated power, and S is the area that radiation value inhales wave wall.Test site is reached therefore, it is possible to determine
The maximum power density P on peripherydmax(mW/cm2) (assuming that antenna power whole free of losses is radiated to the region).Wherein, Pdmax
=max (Pd1, Pd2, Pd3, Pd4)。
Next, the radiant power tested when in order to assess place is suitable with radiant power when satellite actual test,
Must calibrate be radiated to inhale wave wall power density it is suitable with the power density of satellite actual emanations.Field strength survey meter can be passed through
To estimate to test the power of antenna arrival suction wave wall.Certainly, the distance of putting of the test antenna and metope can also be preliminary in advance
Estimation by adjustment appropriate and puts, can make radiosity Psys≥Pdmax.When searching out the test point, recognize
It demarcates and completes for power density.
Assessment test
Firstly, needing to obtain a series of to comprehensively assess the test result of place residue passive intermodulation as far as possible
Sampled data.It, can be with scan ring around 0 °~360 ° of entire place totally 8 assuming that the test days string pendulum in place sets position as center position
The remaining passive intermodulation value of a angle (0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 °).
Then, the PIM value for recording each order of each angle pays attention to observing 10 minutes or so, compares to obtain
Stable power reading.
Stable measurement
Due to the unstability of passive cross modulation test, before whole star PIM test should whithin a period of time (one day) repeatedly (5~
10 times) test site is demarcated, after obtaining corresponding data, place is improved or adjusted according to test result, really
All tooling and ground checkout equipment are able to satisfy the requirement of passive cross modulation test when protecting place and test.Nothing should be recorded simultaneously
The average value and sudden peaks value of source intermodulation are as record result.
According to background scans as a result, rejecting outlier.If the frequency products for still having part not to be inconsistent with technical result, are closed
Whether observed frequency product still remains after closing signal source.After excluding the above abnormal problem, passive intermodulation stable measurement is recorded
Final result.
It will be appreciated that the test method of satellite test environment residue passive intermodulation of the invention is successfully applied at present
In the assessment test of multiple wireless measurement environment, and according to the actual passive intermodulation index magnitude of satellite, the surplus of place has been demarcated
Remaining passive intermodulation value.
In conclusion using technical solution of the present invention, establish suitable wireless test system and to test macro into
It has gone calibration, ensure that the passive intermodulation index of satellite test environment reaches the requirement of satellite passive cross modulation test, so that it is guaranteed that
The authenticity of test result and the influence for reducing test error.
It is not specified in the present invention and partly belongs to techniques known.
Claims (7)
1. a kind of residue passive cross modulation test method, is used under satellite test environment, to the remaining passive intermodulation of test site
Stability carries out assessment test, which comprises the following steps:
Step 1 carries out self calibration to trial system is surveyed, to meet presumptive test requirement；
Step 2 is scanned the background in the test site, to check and remove in the test site except pre-
Other interference outside fixed test；
Step 3, according to the maximum radiated power density of satellite to be measured position, to the radiant power for surveying trial system
Density is calibrated, so that the radiosity for surveying trial system be made to reach the water of the maximum radiated power density
It is flat；And
Step 4, relative to the different location in the test site, sampling obtain the satellite to be measured different location most
Large radiation power density, and the different radiosities for surveying trial system are accordingly obtained, to obtain relatively stable
Radiosity reading,
It wherein, include: according to the satellite to be measured in the step 3 in the specific placement position of the test site and shape
State, setting antenna are inhaled with a distance from wave wall from periphery；According to the field distribution of the antenna, estimate that the aperture field of the antenna is radiated to
The area for inhaling wave wall；Determine that the antenna reaches the maximum power density on the periphery of the test site；Adaptively adjust
It is whole and put the antenna, thus the distance between the metope of antenna described in preresearch estimates and the test site；Correspondingly school
Standard is radiated to the power density for inhaling wave wall, thus make the actual emanations of satellite described in the power density ratio obtained after calibration
The big presetting range of power density；Practical spoke of the power density for inhaling wave wall not less than the satellite is radiated to when searching out
When the test point for the power density penetrated, confirms that the radiosity for surveying trial system is demarcated and complete, in the step 4
In include: based on it is described survey trial system in test antenna placement position around entire test site different angle, adopt
Sample obtains a series of remaining passive intermodulation value；It is recorded in the remaining passive intermodulation value of each order of each angle, and
The predetermined time is observed, to obtain metastable power reading.
2. residue passive cross modulation test method according to claim 1, which is characterized in that execute in said step 1:
Build the survey trial system；
The survey trial system is calibrated, so that it meets the presumptive test requirement；And
Passive intermodulation source is added before the survey trial system and confirms the connectivity for surveying trial system.
3. residue passive cross modulation test method according to claim 2, which is characterized in that in said step 1, described
The step of calibration test system includes:
Gain of the insertion loss and antenna of each section cable of the calibration in the survey trial system in test frequency range；And
The incoming level of the amplifier in the test macro is calibrated by power meter, so that it is guaranteed that the reading of the power meter
Meet the power density that need to be radiated,
Wherein, the presumptive test requires to include at least: measured power requires, test frequency requires, test dynamic range requirement,
With measuring accuracy requirement.
4. residue passive cross modulation test method according to claim 2, which is characterized in that in said step 1, described
Passive intermodulation source is added before the survey trial system and includes: the step of confirming the connectivity for surveying trial system
The passive intermodulation source is added before the antenna in the survey trial system；
Emit two carrier waves according to power and frequency to be tested；
It is measured at the frequency point of scheduled passive intermodulation to be calculated；
When receiving the product of the passive intermodulation, the connectivity for surveying trial system is normal；And
When not receiving the product of the passive intermodulation, the survey trial system is checked again for and confirmed.
5. residue passive cross modulation test method according to claim 1, which is characterized in that execute in the step 2:
Antenna is tested by setting up, checks and is in booting shape with the presence or absence of other unrelated equipments on the periphery of the test site
State；And
The polarization mode combined using vertical polarization and horizontal polarization measures the background in the test site and emphasis record
Signal frequency beyond limit value, thus the external interference that investigation is unrelated with presumptive test.
6. residue passive cross modulation test method according to claim 1, which is characterized in that further include:
In the given time, pre-determined number the test site is demarcated, to obtain corresponding power data；
The test site is improved and adjusted according to test result, so that it is guaranteed that meeting the presumptive test requirement；With
And
The average value and burst for recording the remaining passive intermodulation simultaneously are shown in peak value, as record result.
7. residue passive cross modulation test method according to claim 6, which is characterized in that further include:
According to the background scans as a result, rejecting outlier；
When component frequency product, which is not inconsistent predetermined technique, to be required, passive intermodulation source is closed whether still to observe the frequency products
In the presence of；And
After excluding abnormal problem, stable passive intermodulation result is recorded as final result.
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| CN1870473A (en) * | 2005-10-21 | 2006-11-29 | 华为技术有限公司 | Passive intermodulation testing method of mobile communication base station system |
| CN101471736A (en) * | 2007-12-27 | 2009-07-01 | 奥雷通光通讯设备（上海）有限公司 | Passive cross modulation test system |
| CN102025432A (en) * | 2010-12-17 | 2011-04-20 | 镇江市澳华测控技术有限公司 | Forward and reverse passive inter-modulation (PIM) testing device and method for isolator |
| WO2014085345A1 (en) * | 2012-11-30 | 2014-06-05 | P-Wave Holdings, Llc | Built-in passive intermodulation detector for base station equipment |
-
2014
- 2014-12-15 CN CN201410775300.7A patent/CN105897348B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1870473A (en) * | 2005-10-21 | 2006-11-29 | 华为技术有限公司 | Passive intermodulation testing method of mobile communication base station system |
| CN101471736A (en) * | 2007-12-27 | 2009-07-01 | 奥雷通光通讯设备（上海）有限公司 | Passive cross modulation test system |
| CN102025432A (en) * | 2010-12-17 | 2011-04-20 | 镇江市澳华测控技术有限公司 | Forward and reverse passive inter-modulation (PIM) testing device and method for isolator |
| 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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