CN102857310A - Test method and device for wireless indexes of active antenna system - Google Patents
Test method and device for wireless indexes of active antenna system Download PDFInfo
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- CN102857310A CN102857310A CN201210264079XA CN201210264079A CN102857310A CN 102857310 A CN102857310 A CN 102857310A CN 201210264079X A CN201210264079X A CN 201210264079XA CN 201210264079 A CN201210264079 A CN 201210264079A CN 102857310 A CN102857310 A CN 102857310A
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Abstract
The invention discloses a test method and a device for wireless indexes of an active antenna system. An over the air (OTA) test is used for testing spatial characters of the active antenna system and a near field coupling mode is used for testing radio frequency indexes of the active antenna system. The invention also provides a near field coupling test device which is a radio frequency testing cover. By the aid of the near field coupling test device, the radio frequency index test can be conducted to the active antenna system which is an integral device of an antenna and a multi-channel transceiver under the condition that any extra test interfaces are not required to be added. According to the comprehensive test method, the advantages of the OTA test and the near field coupling mode are combined fully, the defects and the problems of the OTA test and the near field coupling mode are overcome, and the test efficiency and the test cost are optimized.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of method of testing and device of active antenna system wireless index.
Background technology
Active antenna system (AAS) is as the integrated base station communication subsystem of a kind of multichannel transmitting-receiving letter machine and antenna for base station, it is the integration apparatus of antenna and multichannel transmitting-receiving letter machine, interface each other shows as internal interface, be difficult to directly carry out the prevention at radio-frequency port test on the engineering, like this its test brought challenge.
The at present test of traditional base station generally is divided into antenna for base station test and base station equipment test.
Test to antenna for base station, major part adopts OTA (Over The Air, space radio frequency) method of testing at present, and this method also can be used for the test of AAS, it is a kind of method that can full test AAS wireless performance, comprises that spatial character test and radio-frequency (RF) index test.But can bring following problem when specifically being applied to the AAS test:
1) for satisfying measuring accuracy and repeatable requirement, test environment there is certain requirement, such as the test of indoor far field, needs the darkroom of certain size; And the test of outdoor far field is subjected to again the impact of weather and external interference signals easily, all can bring problem like this on testing cost and testing efficiency;
2) each test needs a large amount of Data supports, the time of obtaining a result and need to grow;
3) for some test items of AAS, the failtests during authentication is tested such as CE etc. need to carry out under airtight high and low temperature environment, and this is difficult to finish under the OTA test environment;
4) for some test items of AAS, also there is no need to use OTA test, as with produce relevant test etc.
The conduction test method is adopted in the at present test of the radio-frequency (RF) index of traditional base station equipment mostly, the reference point of test is at the prevention at radio-frequency port of its active part, if adopt the radio-frequency (RF) index of this method test AAS, just active part and the aerial array of active antenna system partly need to be separated, and at active part increase coupling measurement prevention at radio-frequency port, can bring following problem like this:
1) increases the coupling measurement port, destroyed the integrated topological structure of AAS; Increased simultaneously the complexity of design, affected device integration, coupled modes can produce unnecessary loss simultaneously;
2) coupled modes that adopt owing to each equipment manufacturers, coupling parameter difference test authentication for unification and test specification is brought difficulty;
3) test need to be disposed suitable connector and equipment, in order to allow the user get the nod, need to do a large amount of explanations to the authentication of test process and test parameter.
Summary of the invention
The technical problem that the present invention solves provides a kind of method of testing and device of active antenna system wireless index, adopt a kind of comprehensive method of testing, under the prerequisite that satisfies AAS wireless performance index test request, reach optimization at testing cost and testing efficiency.
For solving the problems of the technologies described above, the invention provides a kind of method of testing of active antenna system wireless index,
Adopt space radio frequency (OTA) test that the spatial character of active antenna system is tested;
Adopt the near-field coupling mode that the radio-frequency (RF) index of described active antenna system is tested.
Further, said method also can have following features:
The spatial character test of described active antenna system comprises:
Based on the test environment of darkroom or simulation free space, test the directional diagram of described active antenna system;
Described test environment is calibrated;
Carry out respectively the descending spatial character test of active antenna system and upstream space characteristic test, compensate by the directional diagram to described active antenna system, obtain respectively equivalent isotropically radiated power (EIRP) and equivalent omnidirectional receiving sensitivity (EIRS).
Further, said method also can have following features:
The foundation of described test environment comprises:
Under darkroom or simulation free space environment, the gain reference antenna is installed on the antenna rotating platform, and by RF cable described gain reference antenna is connected with vector signal generator; Reception antenna is installed on the antenna holder, and by RF cable described reception antenna is connected with spectrum analyzer or power meter.
Further, said method also can have following features:
Test environment is calibrated, is specifically comprised:
By adjusting described antenna rotating platform and described antenna holder described gain reference antenna is aimed at described reception antenna forward;
The descending continuous analog signal of described vector signal generator emission designated frequency band is set, receives this signal by described reception antenna and input to described spectrum analyzer or power meter, obtain corresponding signal power;
Obtain the calibration parameter Δ Pc of test environment link.
Further, said method also can have following features:
The descending spatial character test of described active antenna system specifically comprises:
At first, under darkroom or simulation free space environment, described active antenna system is installed on the described antenna rotating platform, and is connected with the backstage configuration device by optical fiber; Described reception antenna is installed on the described antenna holder, and is connected with spectrum analyzer or radio communication comprehensive test instrument by RF cable;
Then, test according to following steps:
11) the described active antenna system of configuration is in emission mode, the fixed wireless wave beam of emission rated power in designated frequency band;
12) adjust described antenna rotating platform so that described active antenna system and described reception antenna reach best re-pointing in level and pitching, the performance number (Pg) that described spectrum analyzer or radio communication comprehensive test instrument are received is maximum or minimum;
13) described active antenna system is done orientation rotation at described antenna rotating platform, the performance number Pg that described spectrum analyzer is measured is as the angle function record; And adjust level or at right angle setting mode and the described receiving polarization direction of described active antenna system, obtain the down direction figure of different primary flats and different polarization;
14) adjust described active antenna system configuration parameter, repeat above-mentioned steps 12) and step 13), the directional diagram that test AAS different beams points to;
15) analyze the descending spatial character of described active antenna system, and obtain described EIRP:EIRP=Pg+ Δ Pc according to following formula, wherein, Δ Pc is the described calibration parameter that obtains, and Pg is the performance number that described spectrum analyzer is measured.
Further, said method also can have following features:
The characteristic test of described active antenna system upstream space specifically comprises:
At first, under darkroom or simulation free space environment, described active antenna system is installed on the described antenna rotating platform, and is connected with the backstage configuration device by optical fiber; Transmitting antenna is installed on the described antenna holder, and is connected with vector signal generator by RF cable;
Then, test according to following steps:
21) the described active antenna system of configuration is in receiving mode, and receives the Antenna Beam of designated frequency band fixed directional;
22) described vector signal generator launching simulation modulation signal in designated frequency band is set, adjust described antenna rotating platform so that described active antenna system and described reception antenna reach best re-pointing in level and pitching, the performance number that described active antenna system is received is maximum or minimum;
23) described active antenna system is done orientation rotation at described antenna rotating platform, and with the received power value (Rs) of described active antenna system as the angle function record; And adjust the level of described active antenna system or the polarised direction of at right angle setting mode and described transmitting antenna, obtain the down direction figure of different primary flats and different polarization;
24) adjust described active antenna system configuration parameter, repeat above-mentioned steps 22) and step 23), the directional diagram that described active antenna system different beams points to tested;
25) analyze the descending spatial character of described active antenna system, and obtain described EIRS:EIRS=Ps-Δ Pc according to following formula, wherein, Δ Pc is the described calibration parameter that obtains, and Ps is described vector signal generator output modulation signal performance number.
Further, said method also can have following features:
Described employing near-field coupling mode is tested the radio-frequency (RF) index of described active antenna system, refers to:
Place test cover to carry out the test of radio-frequency (RF) index described active antenna system, wherein said test cover comprises aerial array and passive network part, and a period of time structure and composition mode of described aerial array and described active antenna system antenna feeder part are identical.
Further, said method also can have following features:
In the following manner the radio-frequency (RF) index of described active antenna system is tested:
Test cover monomer calibration: calibrate differential loss and phase pushing figure that described test cover self produces;
Near-field coupling calibration: with the test cover of two described test cover monomer calibrations of process, the near-field coupling test environment of described test cover is calibrated;
Radio-frequency (RF) index test: place tested active antenna system in the described test cover after the calibration and consist of the near-field coupling mode between the described test cover, its test environment is identical with test environment after described near-field coupling is calibrated; After the calibration result of using described calibration to obtain compensates test environment, by the radio frequency test interface on the described test cover described tested active antenna system is carried out the test of radio-frequency (RF) index, obtain the radio-frequency (RF) index of described tested active antenna system prevention at radio-frequency port.
The present invention also provides a kind of testing apparatus of active antenna system wireless index, and described device comprises that described test cover comprises: metallic shield casing, aerial array, feeding network, branchline coupler, support for the test cover of test active antenna system;
Described metallic shield casing is used for the inside and outside signal of described test cover is shielded;
Described support is for fixing and adjust described aerial array or the tested active antenna system orientation at described test cover;
Described aerial array is connected each a period of time respectively by described feeding network with an end of described branchline coupler; The other end of described branchline coupler is connected to test port, realizes the I/O of signal, finishes the test of each branch road.
Further, said apparatus also can have following features:
Described test cover inside also is provided with the absorbing material that disturbs for reducing the signal of test cover between inner a period of time.
In sum, the present invention proposes a kind of integrated test facility, adopts the OTA test in conjunction with test cover, can be respectively tests all sidedly the wireless performance of AAS from AAS spatial character and two angles of AAS radio-frequency (RF) index.This comprehensive method of testing of the present invention can be used as a kind of method of comprehensively the active antenna system wireless performance being tested, by content measurement being divided into two of spatial character test and radio-frequency (RF) index tests, utilize respectively OTA test and near-field coupling to test to finish, fully combine the advantage of two kinds of method of testings, overcome both defective and problem, thereby reached optimization at testing efficiency and testing cost.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the basic composition block diagram of the radio frequency testing cover of the embodiment of the invention;
Fig. 2 is OTA test environment calibration operation theory diagram;
Fig. 3 is the descending spatial character test job of the active antenna system of embodiment of the invention theory diagram;
Fig. 4 is the active antenna system upstream space characteristic test operation principle block diagram of the embodiment of the invention;
Fig. 5 is the radio frequency testing cover monomer calibrating principle block diagram of the embodiment of the invention;
Fig. 6 is the radio frequency testing cover near-field coupling calibration operation theory diagram of the embodiment of the invention;
Fig. 7 is the radio frequency testing cover test measured piece operation principle block diagram of the embodiment of the invention.
Fig. 8 is the OTA test environment calibration operation flow chart of the embodiment of the invention;
Fig. 9 is the descending spatial character test job of the active antenna system of embodiment of the invention flow chart;
Figure 10 is the active antenna system upstream space characteristic test workflow diagram of the embodiment of the invention;
Figure 11 is the radio frequency testing cover calibration flow chart of the embodiment of the invention;
Figure 12 is the radio frequency testing cover test measured piece workflow diagram of the embodiment of the invention.
Embodiment
For the ease of setting forth the present invention, be described in further detail below with reference to the enforcement of drawings and the specific embodiments to technical solution of the present invention.Need to prove that in the situation of not conflicting, the embodiment among the application and the feature among the embodiment be combination in any mutually.
The test to the AAS wireless index that the present invention proposes mainly is divided into two parts: the test of AAS spatial character and the test of AAS radio-frequency (RF) index.Concrete test process is described below:
1, AAS spatial character test
AAS spatial character test can inheriting tradition the antenna for base station test environment, need to carry out in antenna measurement fields such as darkrooms.The spatial character of main test AAS, the AAS spatial character mainly comprises: wave beam control ability and the precision of AAS, gain test is synthesized in the space, half-power beam width, front and back ratio, cross polarization ratio, minor level are measured, angle of declination test etc., at first by the environment of antenna measurement field, test the directional diagram (relative quantity) of AAS, then calibrating checkout area; To just obtaining characterizing the absolute magnitude of AAS spatial character after the directional diagram compensation, be respectively EIRP (Effective Isotropic Radiated Power, equivalent isotropically radiated power) and EIRS (Effective Isotropic Reference Sensitivity, equivalent omnidirectional receiving sensitivity).
2, AAS radio-frequency (RF) index test
Consider that AAS is as aerial array and transceiver integration apparatus, under the prerequisite of not destroying appliance integrality, propose a kind of testing apparatus that can test the radio-frequency (RF) index of AAS in the embodiment of the invention, this device is equivalent to a testing apparatus, it is called the radio frequency testing cover herein.As shown in Figure 1, the radio frequency testing cover mainly consists of the following components:
Absorbing material 105, the signal of the inside that can reduce test cover between a period of time disturb and to the shielding of the signal of inside and outside, so that have good space electromagnetic environment between test cover and the test specimen.
Aerial array part realizes that by feeding network each a period of time is connected with branchline coupler, realizes that by branchline coupler the I/O of signal finishes the test of each passage.
The test of radio frequency testing cover at first needs test cover self and near-field coupling test environment are calibrated respectively, produces calibration chart; Then place measured piece AAS in test cover, the spatial relationship of fixing test cover and measured piece AAS, its test environment and near-field coupling calibration testing environment facies are together, like this by the near-field coupling mode, realize the test of each passage of AAS, search calibration chart and compensate in the test macro, can extrapolate the wireless radio frequency index of the prevention at radio-frequency port of measured piece AAS.
Simultaneously, because the aerial array of radio frequency testing cover part and measured piece AAS antenna part are identical, to the test of the aerial array part electric property of test cover, can characterize the electrical characteristic of the antenna part of AAS; Test item can comprise: the voltage standing wave ratio test, isolation degree test, calibration circuit parameter testing (for the antenna with calibration circuit) and intermodulation test etc., these test items mainly come the S parameter of port of test antenna and passive intermodulation analyzer to test intermodulation product by vector network analyzer to obtain.
The method of testing of the active antenna system that below will propose the present invention and the specific implementation of device are described in detail.
1, AAS spatial character test
1) test environment calibration
In conjunction with shown in Figure 2, set up test environment.Under 201 environment of darkroom, gain reference antenna 202 is installed on the antenna rotating platform 206, and link to each other with vector signal generator 208 by RF cable 204, the other end, reception antenna 203 is installed on the antenna holder 207, and reception antenna 203 is connected on the spectrum analyzer (or power meter) 209 by RF cable 205.
The environment calibration can be carried out with reference to step shown in Figure 8, specifically comprises following key step:
Step 802 arranges vector signal generator 208 and launches the descending continuous analog signal of designated frequency band.
Step 803 receives this signal by reception antenna 203, inputs to spectrum analyzer or power meter 209, obtains corresponding received signal power and record data, and computational methods are as follows:
Py-Px=Lx+ (Ly-Gh+Ls)-Gs formula (1)
Wherein, Py is vector signal generator 208 output continuous analog signal power values;
Px is that frequency spectrograph or power meter are measured 209 performance number;
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 the OTA test environment.
In the formula (1), Py and Gs are known.Px and Lx can measure, and calculate by formula and can obtain the test environment link calibration parameter Δ Pc of (comprising 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 that carries out the every test of active antenna system under the test environment.
2) the descending spatial character test of active antenna system
According to the test environment of setting up shown in Figure 3, under 301 environment of darkroom, active antenna system 302 is installed on the antenna rotating platform 306, and link to each other with backstage configuration device 308 by optical fiber 304, the other end, reception antenna 303 is installed on the antenna holder 307, is connected radio communication comprehensive test instrument 309 with spectrum analyzer by RF cable 305 and connects.
Carry out with reference to step shown in Figure 9, specifically comprise following key step:
Active antenna system 302 configuration parameters (weights that comprise bay) are adjusted or reconfigured to step 904, and repeating step 902,903 can obtain the different directional diagrams that point to wave beam;
EIRP=Pt+Gt=Pg+ (Ly-Gh+Ls)=Pg+ Δ Pc formula (3)
Wherein, Pt is active antenna system output rated power;
Gt is the gain of transmitting antenna array element;
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 the test environment of setting up shown in Figure 4, under 401 environment of darkroom, active antenna system 402 is installed on the antenna rotating platform 406, and links to each other with backstage configuration device 408 by optical fiber 404; The other end, transmitting antenna 403 are installed on the antenna holder 407, are connected connection with vector signal generator by RF cable 405.
Test according to step shown in Figure 10, specifically comprise following key step:
Step 1001 starts active antenna system 402 and backstage configuration device 408 and normal operation first, by to the backstage configuration parameter so that active antenna system 402 is in receiving mode, and can receive the Antenna Beam of designated frequency band fixed directional.
Step 1002, vector signal generator 409 is set in designated frequency band, launches certain standard (GSM, CDMA, WCDMA or LTE etc.) modulated-analog signal, adjust antenna rotating platform 406 so that active antenna system 402 reaches best re-pointing with transmitting antenna 403 in level and pitching, make its active antenna system 402 measure performance number and be maximum (being used for the main pole test) or minimum (being used for the cross polarization test).
Step 1003, active antenna system 402 are done orientation rotation at test table, and its received power value (Rs) is recorded as the function of angle.The mounting means (level or vertical) of active antenna system 402 and the polarised direction of transmitting antenna 403 can be adjusted respectively, the directional diagram of different primary flats (level or vertical) and different polarization can be obtained.
Step 1004 is adjusted active antenna system 402 configuration parameters (weights that comprise bay), and repeating step 1002,1003 can obtain the different directional diagrams that point to wave beam;
Step 1005 according to the test data of step 1001～1004, is analyzed the upstream space characteristic of AAS; Adjust the signal amplitude (Ps) of vector signal generator 409, so that the demodulation sensitivity of 402 pairs of modulation signals of active antenna system reaches minimum, can obtain EIRS:
EIRS=Rs-Gr=Ps-(Ly-Gh+Ls)=Ps-Δ Pc formula (4)
Wherein, Rs is the received power level that active antenna system detects;
Gr is receiving antenna gain;
Ps is vector signal generator 409 output modulation signal performance numbers;
Δ Pc is calibration parameter.
Because being the mechanical performance of Antenna Design, the performance of the aerial array of active antenna system part determines, can guarantee in large batch of production, performance is stable, and can satisfy the retest requirement, so what the spatial character of active antenna system was tested need only once or several times, just can obtain the spatial character of AAS.
2, AAS radio-frequency (RF) index test
The test of AAS radio-frequency (RF) index mainly comprises two parts, i.e. radio frequency testing cover calibration, the test of measured piece radio-frequency (RF) index.
1) radio frequency testing cover calibration
The calibration of radio frequency testing cover further can 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 calibration: set up as shown in Figure 5 test environment, secondly test according to step shown in the accompanying drawing 11.Shown in step 1101 among Figure 11, fixedly frequency is set in designated frequency band, with the S21 parameter between the b interface of a interface of vector network analyzer test branchline coupler 503 and aerial array 501 incoming ends, the differential loss of each branch road that obtains is that 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 calibration: set up as shown in Figure 6 the calibration environment of near-field coupling, the test cover of two standards (calibrating through monomer) is expressed as respectively test cover A (601) and test cover B (602).The antenna feeder of two test covers part towards over against, by mounting bracket 605 fixing distances between the two.The signal of inside between a period of time that uses absorbing material 606 to reduce test covers disturbs and to the shielding of the signal of inside and outside, so that have good space electromagnetic environment between test cover and the test specimen.Then test according to step shown in Figure 11.Shown in step 1102 among Figure 11, fixedly frequency is set in designated frequency band, with the S21 parameter between a interface of a ' interface of vector network analyzer test test cover B branchline coupler port 604 and test cover A branchline coupler port 603, obtaining two differential losses between the test cover branchline coupler port is that G a ' a nm is (wherein for N * M array active antenna system, n=1, ..., N; M=1 ..., M).
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.
2) radio-frequency (RF) index of measured piece test
Set up as shown in Figure 7 test environment, measured piece AAS701 installation is positioned in the test cover 702 after the calibration, test environment and test cover near-field coupling calibration environment are identical.And test according to following steps shown in Figure 12:
In sum, adopt the method for the invention and device, can realize the wireless index of active antenna system is comprehensively tested.
Compared with prior art, the present invention can satisfy the spatial character of active antenna system and the test request of radiofrequency characteristics simultaneously, can well solve testing efficiency that the OTA method of testing brings and the problem of testing cost, simultaneously, method of testing and device by this near-field coupling of radio frequency testing cover, solved the problem that active antenna equipment does not have the external radio frequency port to bring, can be used as a flight data recorder to measured piece tests, testing standard that can well the inheriting tradition base station, method, instrument and test environment etc. are a kind of effective practical measuring methods in links such as device fabrication and product certifications; Under the prerequisite that guarantees test request, saved testing cost, improved testing efficiency, can be easy to accept and authentication by the user simultaneously.
It below only is preferred case study on implementation of the present invention; be not limited to the present invention; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (10)
1. the method for testing of an active antenna system wireless index is characterized in that,
Adopt space radio frequency (OTA) test that the spatial character of active antenna system is tested;
Adopt the near-field coupling mode that the radio-frequency (RF) index of described active antenna system is tested.
2. the method for claim 1 is characterized in that, the spatial character test of described active antenna system comprises:
Based on the test environment of darkroom or simulation free space, test the directional diagram of described active antenna system;
Described test environment is calibrated;
Carry out respectively the descending spatial character test of active antenna system and upstream space characteristic test, compensate by the directional diagram to described active antenna system, obtain respectively equivalent isotropically radiated power (EIRP) and equivalent omnidirectional receiving sensitivity (EIRS).
3. method as claimed in claim 2 is characterized in that, the foundation of described test environment comprises:
Under darkroom or simulation free space environment, the gain reference antenna is installed on the antenna rotating platform, and by RF cable described gain reference antenna is connected with vector signal generator; Reception antenna is installed on the antenna holder, and by RF cable described reception antenna is connected with spectrum analyzer or power meter.
4. method as claimed in claim 3 is characterized in that, test environment is calibrated, and specifically comprises:
By adjusting described antenna rotating platform and described antenna holder described gain reference antenna is aimed at described reception antenna forward;
The descending continuous analog signal of described vector signal generator emission designated frequency band is set, receives this signal by described reception antenna and input to described spectrum analyzer or power meter, obtain corresponding signal power;
Obtain the calibration parameter Δ Pc of test environment link.
5. method as claimed in claim 4 is characterized in that, the descending spatial character test of described active antenna system specifically comprises:
At first, under darkroom or simulation free space environment, described active antenna system is installed on the described antenna rotating platform, and is connected with the backstage configuration device by optical fiber; Described reception antenna is installed on the described antenna holder, and is connected with spectrum analyzer or radio communication comprehensive test instrument by RF cable;
Then, test according to following steps:
11) the described active antenna system of configuration is in emission mode, the fixed wireless wave beam of emission rated power in designated frequency band;
12) adjust described antenna rotating platform so that described active antenna system and described reception antenna reach best re-pointing in level and pitching, the performance number (Pg) that described spectrum analyzer or radio communication comprehensive test instrument are received is maximum or minimum;
13) described active antenna system is done orientation rotation at described antenna rotating platform, the performance number Pg that described spectrum analyzer is measured is as the angle function record; And adjust level or at right angle setting mode and the described receiving polarization direction of described active antenna system, obtain the down direction figure of different primary flats and different polarization;
14) adjust described active antenna system configuration parameter, repeat above-mentioned steps 12) and step 13), the directional diagram that test AAS different beams points to;
15) analyze the descending spatial character of described active antenna system, and obtain described EIRP:EIRP=Pg+ Δ Pc according to following formula, wherein, Δ Pc is the described calibration parameter that obtains, and Pg is the performance number that described spectrum analyzer is measured.
6. method as claimed in claim 4 is characterized in that, the characteristic test of described active antenna system upstream space specifically comprises:
At first, under darkroom or simulation free space environment, described active antenna system is installed on the described antenna rotating platform, and is connected with the backstage configuration device by optical fiber; Transmitting antenna is installed on the described antenna holder, and is connected with vector signal generator by RF cable;
Then, test according to following steps:
21) the described active antenna system of configuration is in receiving mode, and receives the Antenna Beam of designated frequency band fixed directional;
22) described vector signal generator launching simulation modulation signal in designated frequency band is set, adjust described antenna rotating platform so that described active antenna system and described reception antenna reach best re-pointing in level and pitching, the performance number that described active antenna system is received is maximum or minimum;
23) described active antenna system is done orientation rotation at described antenna rotating platform, and with the received power value (Rs) of described active antenna system as the angle function record; And adjust the level of described active antenna system or the polarised direction of at right angle setting mode and described transmitting antenna, obtain the down direction figure of different primary flats and different polarization;
24) adjust described active antenna system configuration parameter, repeat above-mentioned steps 22) and step 23), the directional diagram that described active antenna system different beams points to tested;
25) analyze the descending spatial character of described active antenna system, and obtain described EIRS:EIRS=Ps-Δ Pc according to following formula, wherein, Δ Pc is the described calibration parameter that obtains, and Ps is described vector signal generator output modulation signal performance number.
7. the method for claim 1 is characterized in that, described employing near-field coupling mode is tested the radio-frequency (RF) index of described active antenna system, refers to:
Place test cover to carry out the test of radio-frequency (RF) index described active antenna system, wherein said test cover comprises aerial array and passive network part, and a period of time structure and composition mode of described aerial array and described active antenna system antenna feeder part are identical.
8. method as claimed in claim 7 is characterized in that, in the following manner the radio-frequency (RF) index of described active antenna system is tested:
Test cover monomer calibration: calibrate differential loss and phase pushing figure that described test cover self produces;
Near-field coupling calibration: with the test cover of two described test cover monomer calibrations of process, the near-field coupling test environment of described test cover is calibrated;
Radio-frequency (RF) index test: place tested active antenna system in the described test cover after the calibration and consist of the near-field coupling mode between the described test cover, its test environment is identical with test environment after described near-field coupling is calibrated; After the calibration result of using described calibration to obtain compensates test environment, by the radio frequency test interface on the described test cover described tested active antenna system is carried out the test of radio-frequency (RF) index, obtain the radio-frequency (RF) index of described tested active antenna system prevention at radio-frequency port.
9. the testing apparatus of an active antenna system wireless index is characterized in that, described device comprises that described test cover comprises: metallic shield casing, aerial array, feeding network, branchline coupler, support for the test cover of test active antenna system;
Described metallic shield casing is used for the inside and outside signal of described test cover is shielded;
Described support is for fixing and adjust described aerial array or the tested active antenna system orientation at described test cover;
Described aerial array is connected each a period of time respectively by described feeding network with an end of described branchline coupler; The other end of described branchline coupler is connected to test port, realizes the I/O of signal, finishes the test of each branch road.
10. device as claimed in claim 9 is characterized in that,
Described test cover inside also is provided with the absorbing material that disturbs for reducing the signal of test cover between inner a period of time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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