CN102857310B - The method of testing and device of a kind of active antenna system wireless index - Google Patents
The method of testing and device of a kind of active antenna system wireless index Download PDFInfo
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- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 250
- 230000008878 coupling Effects 0.000 claims abstract description 30
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 24
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- 230000008859 change Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
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Abstract
The present invention discloses the method for testing and device of a kind of active antenna system wireless index, space radio frequency (OTA) test is respectively adopted the spatial character of active antenna system is tested；The RF index of active antenna system is tested using near-field coupling mode.The invention also provides a kind of device radio frequency testing cover of near-field coupling test, machine integrated equipment can be believed to this antenna of active antenna system and multichannel transmitting-receiving by this device, RF index test is completed in the case where any extra test interface need not be increased.The present invention proposes a kind of method of testing of synthesis, fully combines the advantage of OTA tests and two kinds of method of testings of near-field coupling mode, both defects and problem is overcome, so that being optimal on testing efficiency and testing cost.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of method of testing of active antenna system wireless index
And device.
Background technology
Active antenna system (AAS) believes machine and the integrated base station communication subsystem of antenna for base station as a kind of multichannel transmitting-receiving
System, it is the integration apparatus that antenna and multichannel transmitting-receiving believe machine, and interface each other shows as hardly possible in internal interface, engineering
Directly to carry out prevention at radio-frequency port test, challenge so is brought to its test.
The test of current traditional base station, is generally divided into antenna for base station test and base station equipment test.
Test to antenna for base station, it is most of at present to use OTA (Over The Air, space radio frequency) method of testing, this
Kind of method can be used for AAS test, and it is a kind of method that can test AAS wireless performances comprehensively, including spatial character
Test and RF index test.But it is specifically applied to that during AAS tests following problem can be brought：
1) to meet measuring accuracy and repeatable requirement, there is certain requirement to test environment, such as indoor far field is surveyed
Examination is, it is necessary to the darkroom of certain size；And outdoor far field test, and easily influenceed by weather and external interference signals, so from
Problem can be all brought on testing cost and testing efficiency；
2) test needs substantial amounts of data to support that obtaining a result needs longer time every time；
3) for AAS some test items, the failtests in such as CE certifications experiment is, it is necessary in closed high/low temperature
Carried out under environment, this is difficult to complete under OTA test environments；
4) for AAS some test items, also It is not necessary to be tested using OTA, such as test related to production.
The test of the RF index of current conventional base station device uses conduction test method mostly, and the reference point of test is at it
The prevention at radio-frequency port of active part, if testing AAS RF index in this way, it is necessary to by having for active antenna system
Source part and aerial array are partially separated out, and increase coupling measurement prevention at radio-frequency port in active part, can so bring following ask
Topic：
1) increase coupling measurement port, destroys the topological structure of AAS integrations；The complexity of design is added simultaneously,
Device integration is have impact on, while coupled modes can produce unnecessary loss；
2) due to coupled modes, coupling parameter difference that each equipment manufacturers uses, to unified test certification and test
Specification brings difficulty；
3) test needs are configured with suitable connector and equipment, in order to allow user to get the nod, it is necessary to testing
A large amount of explanations are done in the certification of journey and test parameter.
The content of the invention
Present invention solves the technical problem that being to provide the method for testing and device of a kind of active antenna system wireless index, adopt
With a kind of method of testing of synthesis, on the premise of meeting to AAS wireless performance index test requests, in testing cost and test
Optimization is reached in efficiency.
In order to solve the above technical problems, the invention provides a kind of method of testing of active antenna system wireless index,
Tested using space radio frequency (OTA) and the spatial character of active antenna system is tested；
The RF index of the active antenna system is tested using near-field coupling mode.
Further, the above method can also have following features：
The spatial character test of the active antenna system, including：
Test environment based on darkroom or simulation free space, tests the directional diagram of the active antenna system；
The test environment is calibrated；
The characteristic test of active antenna system downlink spatial and upstream space characteristic test are carried out respectively, by described active
The directional diagram of antenna system is compensated, and respectively obtains equivalent isotropically radiated power (EIRP) and equivalent omnidirectional's receiving sensitivity
(EIRS)。
Further, the above method can also have following features：
The foundation of the test environment, including：
Under darkroom or simulation free space environment, gain reference antenna is arranged on antenna rotating platform, and pass through radio frequency
The gain reference antenna is connected by cable with vector signal generator；Reception antenna is arranged on antenna holder, and led to
Cross RF cable the reception antenna is connected with spectrum analyzer or power meter.
Further, the above method can also have following features：
Test environment is calibrated, specifically included：
Make the gain reference antenna and the reception antenna just by adjusting the antenna rotating platform and the antenna holder
To alignment；
Set the vector signal generator to launch the descending continuous analog signal of designated frequency band, pass through the reception antenna
Receive this signal and input to the spectrum analyzer or power meter, obtain corresponding signal power；
Obtain the calibration parameter Δ Pc of test environment link.
Further, the above method can also have following features：
The active antenna system downlink spatial characteristic test, is specifically included：
First, under darkroom or simulation free space environment, the active antenna system is arranged on the antenna rotating platform
On, and be connected by optical fiber and backstage configuration equipment；The reception antenna is arranged on the antenna holder, and by penetrating
Frequency cable is connected with spectrum analyzer or radio communication comprehensive test instrument；
Then, test is followed the steps below：
11) configure the active antenna system and be in emission mode, the fixation nothing of rated power is launched in designated frequency band
Line wave beam；
12) adjusting the antenna rotating platform causes the active antenna system to be reached with the reception antenna in level and pitching
To optimal sensing, it is maximum or minimum to make the performance number (Pg) that the spectrum analyzer or radio communication comprehensive test instrument are received；
13) active antenna system is done into orientation rotation on the antenna rotating platform, the spectrum analyzer is measured
Performance number Pg recorded as angle function；And adjust the horizontally or vertically mounting means of the active antenna system and described connect
Antenna polarization direction is received, different principal planes and not like-polarized down direction figure are obtained；
14) adjust the active antenna system configuration parameter, repeat the above steps 12) and step 13), test AAS is different
The directional diagram of beam position；
15) the downlink spatial characteristic of the active antenna system is analyzed, and obtains the EIRP according to the following formula：EIRP=Pg
+ Δ Pc, wherein, Δ Pc is the obtained calibration parameter, and Pg is the performance number that the spectrum analyzer is measured.
Further, the above method can also have following features：
The active antenna system upstream space characteristic test, is specifically included：
First, under darkroom or simulation free space environment, the active antenna system is arranged on the antenna rotating platform
On, and be connected by optical fiber and backstage configuration equipment；Transmitting antenna is arranged on the antenna holder, and passes through radio frequency line
Cable is connected with vector signal generator；
Then, test is followed the steps below：
21) configure the active antenna system in a receive mode, and receive designated frequency band and fix the Antenna Beam pointed to；
22) vector signal generator launching simulation modulated signal in designated frequency band is set, the antenna is adjusted and turns
Platform causes the active antenna system to reach optimal sensing in level and pitching with the reception antenna, makes the active antenna
The performance number that system is received is maximum or minimum；
23) active antenna system is done into orientation rotation on the antenna rotating platform, and by the active antenna system
Received power value (Rs) recorded as angle function；And adjust the active antenna system horizontally or vertically mounting means and
The polarised direction of the transmitting antenna, obtains different principal planes and not like-polarized down direction figure；
24) adjust the active antenna system configuration parameter, repeat the above steps 22) and step 23), test described active
The directional diagram that antenna system different beams are pointed to；
25) the downlink spatial characteristic of the active antenna system is analyzed, and obtains the EIRS according to the following formula：EIRS=
Ps-Δ Pc, wherein, Δ Pc is the obtained calibration parameter, and Ps is that the vector signal generator exports modulated signal power
Value.
Further, the above method can also have following features：
The use near-field coupling mode is tested the RF index of the active antenna system, is referred to：
The active antenna system is placed in test cover to the test for carrying out RF index, wherein the test cover includes day
Linear array and passive network part, a period of time structure and composition mode and the active antenna system antenna feeder portion of the aerial array
Divide identical.
Further, the above method can also have following features：
The RF index of the active antenna system is tested in the following manner：
Test cover monomer is calibrated：Calibrate the differential loss and phase pushing figure produced by the test cover itself；
Near-field coupling is calibrated：The test cover calibrated with two processes test cover monomer, to the near field of the test cover
Coupling measurement environment is calibrated；
RF index is tested：By tested active antenna system be placed in calibration after the test cover in the test cover it
Between constitute near-field coupling mode, the test environment after the calibration of its test environment and the near-field coupling is identical；Use the calibration
After obtained calibration result is compensated to test environment, have by the radio frequency test interface on the test cover to described be tested
Source antenna system carries out the test of RF index, obtains the RF index of the tested active antenna system prevention at radio-frequency port.
Present invention also offers a kind of test device of active antenna system wireless index, described device includes being used to test
The test cover of active antenna system, the test cover includes：Metallic shield casing, aerial array, feeding network, branch road connection
Device, support；
The metallic shield casing, for being shielded to the inside and outside signal of the test cover；
The support, for fixing and adjusting the aerial array or tested active antenna system in the test cover
Orientation；
The one end of the aerial array by the feeding network by each a period of time respectively with the branchline coupler is connected；
The other end of the branchline coupler is connected to test port, realizes the input/output of signal, completes the test of each branch road.
Further, said apparatus can also have following features：
The absorbing material for reducing the signal interference inside test cover between a period of time is additionally provided with inside the test cover.
In summary, the present invention proposes a kind of integrated test facility, and binding test cover is tested using OTA, can respectively from
Two angles of AAS spatial characters and AAS RF indexes comprehensively test AAS wireless performance.The survey of this synthesis of the present invention
Method for testing can be as a kind of method tested active antenna system wireless performance comprehensively, by being sky to test division of teaching contents
Between characteristic test and RF index test two, be utilized respectively OTA tests and near-field coupling test to complete, fully combine two
The advantage of method of testing is planted, both defects and problem are overcome, so that being optimal on testing efficiency and testing cost.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the basic composition frame chart of the radio frequency testing cover of the embodiment of the present invention；
Fig. 2 is OTA test environment calibration theory diagrams；
Fig. 3 is the active antenna system downlink spatial characteristic test operation principle block diagram of the embodiment of the present invention；
Fig. 4 is the active antenna system upstream space characteristic test operation principle block diagram of the embodiment of the present invention；
Fig. 5 is the radio frequency testing cover monomer calibrating principle block diagram of the embodiment of the present invention；
Fig. 6 is the radio frequency testing cover near-field coupling calibration theory diagram of the embodiment of the present invention；
Fig. 7 is the radio frequency testing cover test measured piece operation principle block diagram of the embodiment of the present invention.
Fig. 8 is the OTA test environment calibration flow charts of the embodiment of the present invention；
Fig. 9 is the active antenna system downlink spatial characteristic test workflow diagram of the embodiment of the present invention；
Figure 10 is the active antenna system upstream space characteristic test workflow diagram of the embodiment of the present invention；
Figure 11 is the radio frequency testing cover calibration flow chart of the embodiment of the present invention；
Figure 12 is the radio frequency testing cover test measured piece workflow diagram of the embodiment of the present invention.
Embodiment
For the ease of illustrating the present invention, the implementation of technical solution of the present invention is made below with reference to drawings and the specific embodiments
It is described in further detail.It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application
Can mutually it be combined.
It is proposed by the present invention that two parts are broadly divided into the test of AAS wireless indexes：AAS spatial characters are tested and AAS is penetrated
Frequency index test.Specific test process is described as follows：
1st, AAS spatial characters are tested
The test of AAS spatial characters can be with the antenna for base station test environment of inheriting tradition, it is necessary in the antenna measurements such as darkroom
Carry out.Main test AAS spatial character, AAS spatial characters mainly include：Close in AAS beam steering ability and precision, space
Into gain test, half-power beam width, front and rear ratio, cross polarization ratio, minor level are measured, and angle of declination test etc. is led to first
The environment of antenna measurement is crossed, AAS directional diagram (relative quantity) is tested, then calibrating to checkout area；Directional diagram is mended
The absolute magnitude for characterizing AAS spatial characters, respectively EIRP (Effective Isotropic Radiated are can be obtained by after repaying
Power, equivalent isotropically radiated power) and EIRS (Effective Isotropic Reference Sensitivity, it is equivalent
Omnidirectional's receiving sensitivity).
2nd, AAS RF indexes are tested
In view of AAS as aerial array and transceiver integration apparatus, on the premise of appliance integrality is not destroyed,
A kind of test device for the RF index that can test AAS, equivalent to one test dress of the device are proposed in the embodiment of the present invention
Put, that is referred to herein as radio frequency testing cover.As shown in figure 1, radio frequency testing cover is mainly comprised the following steps：
Aerial array 101, is made up of a series of antenna element, and its a period of time structure and composition mode should be with tested AAS's
Antenna feeder part completes identical.
Feed networking 102, for connecting test port and aerial array each a period of time, can be coaxial cable or
Radio frequency microstrip line.
The feed networking of branchline coupler 103, the input/output end port of signal, connecting test port and each passage, is used for
Branch road is tested.
Support 104, the spatial relationship that can be used between fixed RF test cover and test specimen.
Absorbing material 105, the signal between the inside a period of time that can reduce test cover is disturbed and to the signal of inside and outside
Shielding so that between test cover and test specimen have good space electromagnetic environment.
Metallic shield case 106, the housing of test cover can shield to the inside and outside signal of test cover, make it
With good spatial electromagnetic screening ability.
Aerial array part realizes that each a period of time and branchline coupler are connected by feeding network, by branchline coupler come real
The input/output of existing signal completes the test of each passage.
Radio frequency testing cover is tested, it is necessary first to which test cover itself and near-field coupling test environment are calibrated respectively, is produced
Raw calibration table；Then measured piece AAS is placed in test cover, the spatial relationship of fixed test cover and measured piece AAS, its test wrapper
Border is identical with near-field coupling calibration test environment, so by near-field coupling mode, realizes the test of AAS each passage, searches
Calibrate table and compensate into test system, the wireless radio frequency index of measured piece AAS prevention at radio-frequency port can be extrapolated.
Simultaneously as the aerial array part of radio frequency testing cover is identical with measured piece AAS antenna parts, to test cover
Aerial array partial electric performance test, the electrical characteristic of AAS antenna part can be characterized；Test item can include：
Voltage standing wave ratio is tested, isolation degree test, calibration parametric test circuit (being directed to the antenna with calibration circuit) and intermodulation test etc.,
These test items mainly test the S parameter and passive intermodulation analyzer of the port of antenna to test by vector network analyzer
Intermodulation product is obtained.
The method of testing of active antenna system proposed by the present invention and implementing for device will in detail be retouched below
State.
1st, AAS spatial characters are tested
1) test environment is calibrated
With reference to shown in Fig. 2, test environment is set up.Under the environment of darkroom 201, gain reference antenna 202 turns installed in antenna
On platform 206, and it is connected by RF cable 204 with vector signal generator 208, the other end, reception antenna 203 is arranged on antenna
On support 207, and reception antenna 203 is connected on spectrum analyzer (or power meter) 209 by RF cable 205.
The step that environment calibration can refer to shown in Fig. 8 is carried out, and specifically includes following key step：
Step 801, adjustment antenna rotating platform 206 and antenna holder 207 cause gain reference antenna 202 and reception antenna 203
Forward direction alignment.
Step 802, vector signal generator 208 is set to launch the descending continuous analog signal of designated frequency band.
Step 803, this signal is received by reception antenna 203, inputs to spectrum analyzer or power meter 209, obtain phase
The received signal power and record data answered, computational methods are as follows：
Py-Px=Lx+ (Ly-Gh+Ls)-Gs formula (1)
Wherein, Py is that vector signal generator 208 exports continuous analog signal power value；
Px is the performance number of frequency spectrograph or power meter measurement 209；
Gh is the gain of reception antenna；
Gs is the gain of gain reference antenna；
Ly is the differential loss of RF cable 204；
Lx is the differential loss of RF cable 205；
Ls is space path loss in OTA test environments.
In formula (1), known to Py and Gs.Px and Lx can be measured and obtained, and test environment can be obtained by being calculated by formula
The calibration parameter Δ Pc of link (including space loss, cable differential loss, receiving antenna gain etc.).
Δ Pc=(Ly-Gh+Ls)=Py-Px-Lx+Gs formula (2)
This calibration parameter Δ Pc is exactly the basic parameter of progress active antenna system items test under test environment.
2) active antenna system downlink spatial characteristic test
According to test environment is set up shown in Fig. 3, under the environment of darkroom 301, active antenna system 302 is arranged on antenna rotating platform
On 306, and it is connected by optical fiber 304 and backstage configuration equipment 308, the other end, reception antenna 303 is arranged on antenna holder 307
On, connected by RF cable 305 and spectrum analyzer or radio communication comprehensive test instrument 309.
Step shown in reference picture 9 is carried out, and specifically includes following key step：
Step 901, active antenna system 302 and backstage configuration equipment 308 start and normal work, by being configured to backstage
Parameter causes active antenna system 302 to be in emission mode, and the fixed wireless wave beam of rated power is launched in designated frequency band.
Step 902, adjustment antenna rotating platform 306 causes active antenna system 302 with reception antenna 303 in level and pitching
Optimal sensing is reached, the measurement performance number (Pg) of its spectrum analyzer or radio communication comprehensive test instrument 309 (is used for main pole to be maximum
Change test) or it is minimum (being used for cross polarization test).
Step 903, active antenna system 302 does orientation rotation on antenna rotating platform 306, and spectrum analyzer is received
Performance number (Pg) recorded as the function of angle；Simultaneously adjust active antenna system 302 mounting means (level or
Vertically) and reception antenna 303 polarised direction, different principal planes (horizontally or vertically) and not like-polarized direction can be obtained
Figure etc..
Step 904, the configuration parameter of active antenna system 302 (weights for including bay) is adjusted or reconfigures,
Repeat step 902,903 can obtain being differently directed the directional diagram of wave beam；
Step 905, according to the test data of step 902~904, AAS downlink spatial characteristic is analyzed, and according to calibrating
The Δ Pc that journey is obtained, can obtain EIRP：
EIRP=Pt+Gt=Pg+ (Ly-Gh+Ls)=Pg+ Δ Pc formula (3)
Wherein, Pt is that active antenna system exports rated power；
Gt is transmitting antenna array element gain；
Pg is the performance number that spectrum analyzer 309 is measured；
Δ Pc is calibration parameter.
3) active antenna system upstream space characteristic test
According to test environment is set up shown in Fig. 4, under the environment of darkroom 401, active antenna system 402 is arranged on antenna rotating platform
On 406, and it is connected by optical fiber 404 and backstage configuration equipment 408；The other end, transmitting antenna 403 is arranged on antenna holder 407
On, connected by RF cable 405 and vector signal generator 409.
Tested according to step shown in Figure 10, specifically include following key step：
Step 1001, first active antenna system 402 and backstage configuration equipment 408 are started and normal work, by rear
Platform configuration parameter causes active antenna system 402 in a receive mode, it is possible to receives designated frequency band and fixes the wireless wave pointed to
Beam.
Step 1002, vector signal generator 409 is set to launch certain standard (GSM, CDMA, WCDMA in designated frequency band
Or LTE etc.) modulated-analog signal, adjustment antenna rotating platform 406 causes active antenna system 402 with transmitting antenna 403 in level
With optimal sensing is reached in pitching, its active antenna system 402 is measured performance number for maximum (being used for main polarization test) or most
Small (being used for cross polarization test).
Step 1003, active antenna system 402 does orientation rotation on test table, and its received power value (Rs) is made
Recorded for the function of angle.Can adjust respectively active antenna system 402 mounting means (horizontally or vertically) and
The polarised direction of transmitting antenna 403, can obtain different principal planes (horizontally or vertically) and not like-polarized directional diagram.
Step 1004, the adjustment configuration parameter of active antenna system 402 (weights for including bay), repeat step
1002nd, 1003 it can obtain being differently directed the directional diagram of wave beam；
Step 1005, according to the test data of step 1001~1004, AAS upstream space characteristic is analyzed；Adjust vector
The signal amplitude (Ps) of signal generator 409 so that active antenna system 402 reaches most to the demodulation sensitivity of modulated signal
It is small, EIRS can be obtained：
EIRS=Rs-Gr=Ps- (Ly-Gh+Ls)=Ps-Δ Pc formula (4)
Wherein, Rs is the received power level that active antenna system is detected；
Gr is receiving antenna gain；
Ps is that vector signal generator 409 exports modulated signal performance number；
Δ Pc is calibration parameter.
Because the mechanical performance that the performance of the aerial array part of active antenna system is Antenna Design is determined, Ke Yibao
Card is in large batch of production, and performance is stable, and can meet retest requirement, so the sky of active antenna system
Between characteristic test need only be once or several times, it is possible to obtain AAS spatial character.
2nd, AAS RF indexes are tested
The test of AAS RF indexes mainly includes two parts, the i.e. calibration of radio frequency testing cover, the test of measured piece RF index.
1) radio frequency testing cover is calibrated
The calibration of radio frequency testing cover can further be divided into the calibration of radio frequency testing cover monomer and the calibration of radio frequency testing cover near-field coupling.
(1) radio frequency testing cover monomer is calibrated：Test environment is set up as shown in Figure 5, is secondly entered according to step shown in accompanying drawing 11
Row test.As shown in step 1101 in Figure 11, fixed frequency is set in designated frequency band, branch road is tested with vector network analyzer
S21 parameters between a interfaces of connector 503 and the b interfaces of the incoming end of aerial array 501, the differential loss of obtained each branch road is
G_ab_nm is (wherein for N M array active antenna system, n=1 ..., N；M=1 ..., M)；
(2) radio frequency testing cover near-field coupling is calibrated：Set up the calibration environment of near-field coupling as shown in Figure 6, two standards
Test cover (being calibrated by monomer) is expressed as test cover A (601) and test cover B (602).The antenna feeder portion of two test covers
Point direction be just to, distance between the two is fixed by mounting bracket 605.Test cover is reduced using absorbing material 606
Inside a period of time between signal interference and the shielding of signal to inside and outside so that have between test cover and test specimen
Good space electromagnetic environment.Then tested according to step shown in Figure 11.As shown in step 1102 in Figure 11, frequency is being specified
Fixed frequency is set in section, a' interfaces and the test cover of test cover B branchline couplers port 604 are tested with vector network analyzer
S21 parameters between a interfaces of A branchline couplers port 603, obtain the differential loss between two test cover branchline coupler ports
It is G_a'a_nm (wherein for N M array active antenna system, n=1 ..., N；M=1 ..., M).
Step 1103, if using test cover A as measured piece, a' circle of test cover B branchline coupler port 604 can be obtained
Differential loss G_a'b_nm between face and the aerial array access interface b interfaces of measured piece (test cover A) is,
G_a'b_nm=G_a'a_nm-G_ab_nm；
Wherein, for N M array active antenna system, n=1 ..., N；M=1 ..., M；
G_ab_nm is radio frequency testing cover monomer calibration value；
G_a'a_nm is radio frequency testing cover near-field coupling calibration value.
Step 1104, in desired test frequency range, high, normal, basic three frequency repeat steps 1102 and step can be selected
1103, multifrequency point calibration can also be carried out according to the requirement of measuring accuracy.The mathematics meter such as interpolation is finally made to multigroup calibration data
Calculate, obtain the two-dimensional table or curve of correspondence calibration frequency and calibration value under near-field coupling environment.It can be obtained by by tabling look-up
The calibration value Δ Gc of the radio frequency testing cover of any frequency in designated frequency band.
2) the RF index test of measured piece
Test environment is set up as shown in Figure 7, measured piece AAS701 is installed to the test cover 702 being positioned at after a calibration
Interior, test environment is identical with test cover near-field coupling calibration environment.And tested according to following steps shown in Figure 12：
Step 1201 is, it is necessary to which the gain to each branch road is compensated.The approximation of compensation is by calibrating the school in link
Quasi- table checks in Δ Gc.The position of compensation can be in the numeric field of active antenna system, can also be in test instrumentation.
Step 1202, after compensating radio frequency testing cover, AAS BS requirement can be directed to according to 3GPP agreements, is carried out every
RF index is tested.Prevention at radio-frequency port of the test reference point equivalent to tested active antenna system.
In summary, using the method for the invention and device, it is possible to achieve the wireless index of active antenna system is entered
Row comprehensively test.
Compared with prior art, the present invention can meet the spatial character of active antenna system and the survey of radiofrequency characteristicses simultaneously
Examination requirement, the problem of can be very good the testing efficiency and testing cost that solution OTA method of testings are brought, meanwhile, pass through radio frequency
The method of testing and device of this near-field coupling of test cover, solving active antenna equipment does not have what external radio frequency port brought to ask
Topic, can test measured piece as a flight data recorder, can be very good the testing standard of inheriting tradition base station, method,
Instrument and test environment etc., are a kind of effective practical measuring methods in the link such as equipment production and product certification；Ensureing
On the premise of test request, testing cost is saved, testing efficiency is improved, while can be easy to receive by user and recognize
Card.
It these are only that the present invention's is preferable to carry out case, be not intended to limit the invention, the present invention can also have other
Various embodiments, in the case of without departing substantially from spirit of the invention and its essence, those skilled in the art can be according to this hair
It is bright to make various corresponding changes and deformation, but these corresponding changes and deformation should all belong to appended claims of the invention
Protection domain.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and constituted
Network on, alternatively, the program code that they can be can perform with computing device be realized, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be shown to be performed different from order herein
The step of going out or describe, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
Claims (6)
1. a kind of method of testing of active antenna system wireless index, it is characterised in that
Tested using space radio frequency (OTA) and the spatial character of active antenna system is tested；
The RF index of the active antenna system is tested using near-field coupling mode；
The use near-field coupling mode is tested the RF index of the active antenna system, is referred to：
The active antenna system is placed in test cover to the test for carrying out RF index, wherein the test cover includes antenna array
Row and passive network part, a period of time structure and composition mode and the active antenna system antenna feeder part of the aerial array are complete
It is exactly the same；
The RF index of the active antenna system is tested in the following manner：
Test cover monomer is calibrated：Calibrate the differential loss and phase pushing figure produced by the test cover itself；
Near-field coupling is calibrated：The test cover calibrated with two processes test cover monomer, to the near-field coupling of the test cover
Test environment is calibrated；
RF index is tested：Tested active antenna system is placed in the test cover after calibration the structure between the test cover
Into near-field coupling mode, the test environment after its test environment is calibrated with the near-field coupling is identical；Obtained using the calibration
Calibration result test environment is compensated after, by the radio frequency test interface on the test cover to it is described be tested active day
Linear system system carries out the test of RF index, obtains the RF index of the tested active antenna system prevention at radio-frequency port.
2. the method as described in claim 1, it is characterised in that the spatial character test of the active antenna system, including：
Test environment based on darkroom or simulation free space, tests the directional diagram of the active antenna system；
The test environment is calibrated；
The characteristic test of active antenna system downlink spatial and upstream space characteristic test are carried out respectively, by the active antenna
The directional diagram of system is compensated, and respectively obtains equivalent isotropically radiated power (EIRP) and equivalent omnidirectional's receiving sensitivity
(EIRS)。
3. method as claimed in claim 2, it is characterised in that the foundation of the test environment, including：
Under darkroom or simulation free space environment, gain reference antenna is arranged on antenna rotating platform, and pass through RF cable
The gain reference antenna is connected with vector signal generator；Reception antenna is arranged on antenna holder, and by penetrating
The reception antenna is connected by frequency cable with spectrum analyzer or power meter.
4. method as claimed in claim 3, it is characterised in that calibrated to test environment, is specifically included：
Make the gain reference antenna and the reception antenna forward direction right by adjusting the antenna rotating platform and the antenna holder
It is accurate；
Set the vector signal generator to launch the descending continuous analog signal of designated frequency band, received by the reception antenna
This signal inputs to the spectrum analyzer or power meter, obtains corresponding signal power；
Obtain the calibration parameter Δ Pc of test environment link.
5. method as claimed in claim 4, it is characterised in that the active antenna system downlink spatial characteristic test, specifically
Including：
First, under darkroom or simulation free space environment, the active antenna system is arranged on the antenna rotating platform, and
Equipment is configured by optical fiber and backstage to be connected；The reception antenna is arranged on the antenna holder, and passes through radio frequency line
Cable is connected with spectrum analyzer or radio communication comprehensive test instrument；
Then, test is followed the steps below：
11) configure the active antenna system and be in emission mode, the fixed wireless ripple of rated power is launched in designated frequency band
Beam；
12) adjusting the antenna rotating platform causes the active antenna system to be reached most in level and pitching with the reception antenna
Good to point to, it is maximum or minimum to make the performance number (Pg) that the spectrum analyzer or radio communication comprehensive test instrument are received；
13) active antenna system is done into orientation rotation on the antenna rotating platform, the work(that the spectrum analyzer is measured
Rate value Pg is recorded as angle function；And adjust horizontally or vertically mounting means and the reception day of the active antenna system
Linear polarization direction, obtains different principal planes and not like-polarized down direction figure；
14) adjust the active antenna system configuration parameter, repeat the above steps 12) and step 13), test AAS different beams
The directional diagram of sensing；
15) the downlink spatial characteristic of the active antenna system is analyzed, and obtains the EIRP according to the following formula：EIRP=Pg+ Δs
Pc, wherein, Δ Pc is the obtained calibration parameter, and Pg is the performance number that the spectrum analyzer is measured.
6. method as claimed in claim 4, it is characterised in that the active antenna system upstream space characteristic test, specifically
Including：
First, under darkroom or simulation free space environment, the active antenna system is arranged on the antenna rotating platform, and
Equipment is configured by optical fiber and backstage to be connected；By transmitting antenna be arranged on the antenna holder on, and by RF cable with
Vector signal generator is connected；
Then, test is followed the steps below：
21) configure the active antenna system in a receive mode, and receive designated frequency band and fix the Antenna Beam pointed to；
22) vector signal generator launching simulation modulated signal in designated frequency band is set, and adjusting the antenna rotating platform makes
Obtain the active antenna system and optimal sensing is reached in level and pitching with the reception antenna, make the active antenna system
The performance number of reception is maximum or minimum；
23) active antenna system is done into orientation rotation, and connecing the active antenna system on the antenna rotating platform
Performance number (Rs) is received to record as angle function；And adjust the horizontally or vertically mounting means of the active antenna system and described
The polarised direction of transmitting antenna, obtains different principal planes and not like-polarized down direction figure；
24) adjust the active antenna system configuration parameter, repeat the above steps 22) and step 23), test the active antenna
The directional diagram that system different beams are pointed to；
25) the downlink spatial characteristic of the active antenna system is analyzed, and obtains the EIRS according to the following formula：EIRS=Ps-Δ
Pc, wherein, Δ Pc is the obtained calibration parameter, and Ps is that the vector signal generator exports modulated signal performance number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210264079.XA CN102857310B (en) | 2012-07-27 | 2012-07-27 | The method of testing and device of a kind of active antenna system wireless index |
| PCT/CN2013/080124 WO2013185697A1 (en) | 2012-07-27 | 2013-07-25 | Method and device for testing wireless index of active antenna system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210264079.XA CN102857310B (en) | 2012-07-27 | 2012-07-27 | The method of testing and device of a kind of active antenna system wireless index |
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| CN102857310B true CN102857310B (en) | 2017-10-27 |
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| WO (1) | WO2013185697A1 (en) |
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