CN102857310B - The method of testing and device of a kind of active antenna system wireless index - Google Patents

Abstract

The invention discloses a method and a device for testing wireless indicators of an active antenna system, respectively adopting an over-the-air radio frequency (OTA) test to test the spatial characteristics of the active antenna system; using a near-field coupling method to test the radio frequency indicators of the active antenna system test. The present invention also proposes a device-radio frequency test cover for near-field coupling testing, through which the antenna and multi-channel transceiver integrated equipment of the active antenna system can be tested without adding any additional test interface Complete the radio frequency index test. The invention proposes a comprehensive testing method, which fully combines the advantages of OTA testing and near-field coupling testing methods, overcomes the defects and problems of the two testing methods, and thus achieves optimization in testing efficiency and testing cost.

Description

A method and device for testing wireless indicators of an active antenna system

technical field

The invention relates to the technical field of wireless communication, in particular to a method and device for testing wireless indicators of an active antenna system.

Background technique

Active Antenna System (AAS) is a base station communication subsystem integrating multi-channel transceiver and base station antenna. It is an integrated device of antenna and multi-channel transceiver. The interface between them is an internal interface. Engineering It is difficult to directly test the RF port on the Internet, which brings challenges to its test.

At present, the test of traditional base stations is generally divided into base station antenna test and base station equipment test.

Most of the base station antenna tests currently use the OTA (Over The Air, spatial radio frequency) test method. This method can also be used for AAS testing. It is a method that can comprehensively test the wireless performance of AAS, including space characteristic testing. And RF index test. However, when it is specifically applied to AAS testing, it will bring the following problems:

1) In order to meet the requirements of test accuracy and repeatability, there are certain requirements for the test environment. For example, indoor far-field testing requires a darkroom of a certain size; while outdoor far-field testing is easily affected by weather and external interference signals. This will bring problems in terms of test cost and test efficiency;

2) Each test requires a large amount of data support, and it takes a long time to get the results;

3) For some test items of AAS, such as the reliability test in the CE certification experiment, etc., it needs to be carried out in a closed high and low temperature environment, which is difficult to complete in the OTA test environment;

4) For some test items of AAS, it is not necessary to use OTA tests, such as production-related tests.

At present, most of the radio frequency index tests of traditional base station equipment adopt the conduction test method, and the reference point of the test is the radio frequency port of the active part. If this method is used to test the radio frequency index of the AAS, the active part of the active antenna system needs to be It is separated from the antenna array part, and the coupling test RF port is added to the active part, which will bring the following problems:

1) Increase the coupling test port, which destroys the topology of AAS integration; at the same time, it increases the complexity of the design, affects the integration of equipment, and the coupling method will cause unnecessary loss;

2) Due to the different coupling methods and coupling parameters adopted by various equipment manufacturers, it is difficult to unify test certification and test specifications;

3) The test needs to be equipped with suitable connectors and equipment. In order to allow users to be recognized, it is necessary to give a lot of instructions on the test process and the certification of test parameters.

Contents of the invention

The technical problem solved by the present invention is to provide a test method and device for the wireless index of an active antenna system. A comprehensive test method is adopted, and on the premise of meeting the test requirements for AAS wireless performance index, the test cost and test efficiency are improved. achieve optimization.

In order to solve the above-mentioned technical problems, the present invention provides a method for testing wireless indicators of an active antenna system,

The spatial characteristics of the active antenna system are tested by the spatial radio frequency (OTA) test;

The radio frequency index of the active antenna system is tested by using a near-field coupling method.

Further, the above method can also have the following characteristics:

The spatial characteristic test of the active antenna system includes:

Based on a darkroom or a test environment simulating free space, test the pattern of the active antenna system;

Calibrating the test environment;

The downlink spatial characteristic test and the uplink spatial characteristic test of the active antenna system are respectively carried out, and the equivalent isotropic radiated power (EIRP) and the equivalent isotropic receiving sensitivity (EIRS) are respectively obtained by compensating the pattern of the active antenna system. ).

Further, the above method can also have the following characteristics:

The establishment of the test environment includes:

In a darkroom or simulated free space environment, install the gain reference antenna on the antenna turntable, and connect the gain reference antenna with the vector signal generator through a radio frequency cable; install the receiving antenna on the antenna bracket, and A cable connects the receiving antenna to a spectrum analyzer or power meter.

Further, the above method can also have the following characteristics:

Calibrate the test environment, including:

aligning the gain reference antenna with the receiving antenna in a forward direction by adjusting the antenna turntable and the antenna bracket;

The vector signal generator is set to transmit a downlink continuous analog signal of a designated frequency band, and the signal is received by the receiving antenna and input to the spectrum analyzer or power meter to obtain the corresponding signal power;

Get the calibration parameter ΔPc of the test environment link.

Further, the above method can also have the following characteristics:

The active antenna system downlink space characteristic test specifically includes:

First, in a darkroom or simulated free space environment, the active antenna system is installed on the antenna turntable, and connected to the background configuration equipment through an optical fiber; the receiving antenna is installed on the antenna bracket, and Connect with a spectrum analyzer or a wireless communication comprehensive tester through a radio frequency cable;

Then, follow the steps below to test:

11) configuring the active antenna system to be in a transmitting mode, and transmitting a fixed wireless beam of rated power within a specified frequency band;

12) Adjust the antenna turntable so that the active antenna system and the receiving antenna reach the best pointing level and pitch, so that the power value (Pg) received by the spectrum analyzer or wireless communication comprehensive tester is maximum or minimum;

13) Perform azimuth rotation of the active antenna system on the antenna turntable, record the power value Pg measured by the spectrum analyzer as an angle function; and adjust the horizontal or vertical installation mode and The polarization direction of the receiving antenna obtains downlink patterns of different main planes and different polarizations;

14) Adjust the configuration parameters of the active antenna system, repeat the above step 12) and step 13), and test the pattern of different beams of the AAS;

15) Analyze the downlink spatial characteristics of the active antenna system, and obtain the EIRP according to the following formula: EIRP=Pg+ΔPc, where ΔPc is the calibration parameter obtained, and Pg is the power measured by the spectrum analyzer value.

Further, the above method can also have the following characteristics:

The active antenna system uplink space characteristic test specifically includes:

First, in a darkroom or a simulated free space environment, the active antenna system is installed on the antenna turntable, and connected to the background configuration equipment through an optical fiber; The cable is connected with the vector signal generator;

Then, follow the steps below to test:

21) Configuring the active antenna system to be in a receiving mode, and receiving fixed-point wireless beams in a specified frequency band;

22) Set the vector signal generator to transmit analog modulated signals in a specified frequency band, adjust the antenna turntable so that the active antenna system and the receiving antenna achieve the best pointing in horizontal and pitch, so that the active The power value received by the antenna system is maximum or minimum;

23) Perform azimuth rotation of the active antenna system on the antenna turntable, and record the received power value (Rs) of the active antenna system as an angle function; and adjust the level or The vertical installation mode and the polarization direction of the transmitting antenna obtain the downlink pattern of different main planes and different polarizations;

24) Adjust the configuration parameters of the active antenna system, repeat the above steps 22) and 23), and test the pattern of different beams of the active antenna system;

25) Analyze the downlink spatial characteristics of the active antenna system, and obtain the EIRS according to the following formula: EIRS=Ps-ΔPc, where ΔPc is the obtained calibration parameter, and Ps is the output modulation of the vector signal generator Signal power value.

Further, the above method can also have the following characteristics:

The use of near-field coupling to test the radio frequency index of the active antenna system refers to:

The active antenna system is placed in a test cover to test the radio frequency index, wherein the test cover includes an antenna array and a passive network part, and the structure and composition of the antenna array are similar to those of the active antenna system antenna. Feedback is exactly the same.

Further, the above method can also have the following characteristics:

The radio frequency index of the active antenna system is tested in the following manner:

Test cover single calibration: calibrate the difference loss and phase offset generated by the test cover itself;

Near-field coupling calibration: use two test covers that have been calibrated by the test cover to calibrate the near-field coupling test environment of the test cover;

Radio frequency index test: place the active antenna system under test in the calibrated test cover and form a near-field coupling mode between the test cover, and the test environment is the same as the test environment after the near-field coupling calibration; After the test environment is compensated by using the calibration result obtained by the calibration, the radio frequency index test of the active antenna system under test is carried out through the radio frequency test interface on the test cover, and the radio frequency of the active antenna system under test is obtained. RF index of the port.

The present invention also provides a test device for wireless indicators of an active antenna system. The device includes a test cover for testing the active antenna system. The test cover includes: a metal shielding box, an antenna array, a feed network, Branch connectors, brackets;

The metal shielding box is used to shield the internal and external signals of the test cover;

The bracket is used to fix and adjust the orientation of the antenna array or the active antenna system under test in the test cover;

The antenna array connects each element to one end of the branch connector through the feed network; the other end of the branch connector is connected to the test port to realize signal input/output, and complete each branch connector. road test.

Further, the above-mentioned device can also have the following characteristics:

The inside of the test cover is also provided with a wave-absorbing material for reducing signal interference between elements inside the test cover.

To sum up, the present invention proposes a comprehensive test method, which uses OTA test combined with a test cover to comprehensively test the wireless performance of AAS from two perspectives of AAS spatial characteristics and AAS radio frequency indicators. This comprehensive test method of the present invention can be used as a method for comprehensively testing the wireless performance of the active antenna system. By dividing the test content into two items, the space characteristic test and the radio frequency index test, the OTA test and the near-field coupling test are used respectively. It fully combines the advantages of the two test methods, overcomes the defects and problems of the two, and thus achieves the optimization in test efficiency and test cost.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the basic composition block diagram of the radio frequency test cover of the embodiment of the present invention;

Figure 2 is a block diagram of the working principle of OTA test environment calibration;

Fig. 3 is a working principle block diagram of the active antenna system downlink spatial characteristic test of the embodiment of the present invention;

Fig. 4 is a block diagram of the working principle of the active antenna system uplink spatial characteristic test according to the embodiment of the present invention;

Fig. 5 is a schematic block diagram of a single calibration of a radio frequency test cover in an embodiment of the present invention;

Fig. 6 is a block diagram of the working principle of near-field coupling calibration of the radio frequency test cover according to the embodiment of the present invention;

Fig. 7 is a block diagram of the working principle of the radio frequency test cover to test the device under test according to the embodiment of the present invention.

Fig. 8 is the OTA test environment calibration work flowchart of the embodiment of the present invention;

Fig. 9 is a flow chart of testing the downlink spatial characteristics of the active antenna system according to the embodiment of the present invention;

Fig. 10 is a flow chart of testing the uplink spatial characteristics of the active antenna system according to the embodiment of the present invention;

Fig. 11 is a flowchart of calibration of a radio frequency test cover according to an embodiment of the present invention;

Fig. 12 is a working flow chart of testing a DUT by a radio frequency test cover according to an embodiment of the present invention.

detailed description

In order to facilitate the description of the present invention, the implementation of the technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The AAS wireless index test proposed by the present invention is mainly divided into two parts: AAS space characteristic test and AAS radio frequency index test. The specific test process is described as follows:

1. AAS space characteristic test

The AAS spatial characteristic test can inherit the traditional base station antenna test environment and needs to be carried out in an antenna test field such as a darkroom. Mainly test the spatial characteristics of AAS, AAS spatial characteristics mainly include: AAS beam control capability and accuracy, spatial synthesis gain test, half power beam width, front-to-back ratio, cross-polarization ratio, sidelobe level measurement, downtilt angle test, etc. Firstly, through the environment of the antenna test field, test the pattern (relative quantity) of the AAS, and then calibrate the test field; after compensating the pattern, the absolute quantity representing the spatial characteristics of the AAS can be obtained, which are EIRP (Effective Isotropic RadiatedPower, Equivalent Isotropic Radiated Power) and EIRS (Effective Isotropic Reference Sensitivity, Equivalent Isotropic Receive Sensitivity).

2. AAS radio frequency index test

Considering that AAS is an integrated device of antenna array and transceiver, on the premise of not destroying the integrity of the device, a test device that can test the radio frequency index of AAS is proposed in the embodiment of the present invention, which is equivalent to a test device. It is referred to herein as an RF test enclosure. As shown in Figure 1, the RF test cover is mainly composed of the following parts:

The antenna array 101 is composed of a series of antenna elements, the structure and composition of which should be the same as that of the antenna feeder of the AAS under test.

The feeding circuit 102 is used to connect the test port and each element of the antenna array, and may be a coaxial cable or a radio frequency microstrip line.

The branch connector 103 is the input/output port of the signal, and connects the test port and the feeder circuit of each channel, and is used for the branch test.

The bracket 104 can be used to fix the spatial relationship between the radio frequency test cover and the object under test.

The wave-absorbing material 105 can reduce the signal interference between the inner elements of the test cover and shield the internal and external signals, so that there is a good space electromagnetic environment between the test cover and the tested object.

The metal shielding box 106, the shell of the test cover, can shield the internal and external signals of the test cover, so that it has a good space electromagnetic shielding capability.

The antenna array part realizes the connection between each element and the branch connector through the feed network, and realizes the input/output of the signal through the branch connector to complete the test of each channel.

For the RF test cover test, it is first necessary to calibrate the test cover itself and the near-field coupling test environment to generate a calibration table; then place the AAS under test in the test cover, fix the spatial relationship between the test cover and the AAS under test, and test The environment is the same as the near-field coupling calibration test environment. In this way, through the near-field coupling method, the test of each channel of the AAS is realized, the calibration table is searched and compensated to the test system, and the radio frequency index of the radio frequency port of the AAS under test can be calculated.

At the same time, since the antenna array part of the RF test cover is exactly the same as the AAS antenna part of the DUT, the test of the electrical performance of the antenna array part of the test cover can characterize the electrical characteristics of the antenna part of the AAS; the test items can include: voltage standing wave Ratio test, isolation test, calibration circuit parameter test (for antenna with calibration circuit) and intermodulation test, etc. These test items are mainly tested by vector network analyzer to test the S parameters of the antenna port and passive intermodulation analyzer. The test intermodulation product is obtained.

The specific implementation of the testing method and device for the active antenna system proposed by the present invention will be described in detail below.

1. AAS space characteristic test

1) Test environment calibration

Combined with what is shown in Figure 2, a test environment is established. Under the darkroom 201 environment, the gain reference antenna 202 is installed on the antenna turntable 206, and is connected with the vector signal generator 208 by the radio frequency cable 204, and the other end, the receiving antenna 203 is installed on the antenna bracket 207, and the receiving antenna 203 is passed through The radio frequency cable 205 is connected to a spectrum analyzer (or power meter) 209 .

Environmental calibration can be carried out with reference to the steps shown in Figure 8, which specifically includes the following main steps:

Step 801 , adjust the antenna turntable 206 and the antenna bracket 207 so that the gain reference antenna 202 is aligned with the receiving antenna 203 in the forward direction.

Step 802, setting the vector signal generator 208 to transmit a downlink continuous analog signal of a specified frequency band.

Step 803, receive the signal through the receiving antenna 203, input it to the spectrum analyzer or power meter 209, obtain the corresponding received signal power and record the data, the calculation method is as follows:

Py-Px＝Lx+(Ly-Gh+Ls)-Gs formula (1)

Wherein, Py is the vector signal generator 208 output continuous analog signal power value;

Px is the power value of 209 measured by spectrum analyzer or power meter;

Gh is the gain of the receiving antenna;

Gs is the gain of the gain reference antenna;

Ly is the differential loss of the radio frequency cable 204;

Lx is the differential loss of the radio frequency cable 205;

Ls is the spatial path loss in the OTA test environment.

In formula (1), Py and Gs are known. Px and Lx can be measured, and the calibration parameter ΔPc of the test environment link (including space loss, cable differential loss, receiving antenna gain, etc.) can be obtained through formula calculation.

ΔPc=(Ly-Gh+Ls)=Py-Px-Lx+Gs Formula (2)

The calibration parameter ΔPc is a benchmark parameter for performing various tests of the active antenna system under the test environment.

2) Active antenna system downlink space characteristic test

Establish the test environment as shown in Figure 3, in the darkroom 301 environment, the active antenna system 302 is installed on the antenna turntable 306, and is connected with the background configuration equipment 308 through the optical fiber 304, and the other end, the receiving antenna 303 is installed on the antenna support 307 , connected to a spectrum analyzer or a wireless communication comprehensive testing instrument 309 through a radio frequency cable 305 .

Carry out with reference to the steps shown in Figure 9, specifically include the following main steps:

In step 901, the active antenna system 302 and the background configuration device 308 are started and working normally, and the active antenna system 302 is in the transmitting mode by configuring the parameters in the background to transmit fixed wireless beams with rated power in the specified frequency band.

Step 902, adjust the antenna turntable 306 so that the active antenna system 302 and the receiving antenna 303 achieve the best pointing on the horizontal and pitch, so that the measured power value (Pg) of its spectrum analyzer or wireless communication comprehensive tester 309 is the maximum (using for main polarization testing) or minimum (for cross polarization testing).

Step 903, the active antenna system 302 performs azimuth rotation on the antenna turntable 306, and records the power value (Pg) received by the spectrum analyzer as a function of the angle; simultaneously adjust the installation mode of the active antenna system 302 (horizontal or Vertical) and the polarization direction of the receiving antenna 303, different main planes (horizontal or vertical) and different polarization patterns can be obtained.

Step 904, adjust or reconfigure the configuration parameters of the active antenna system 302 (including the weights of the antenna array elements), and repeat steps 902 and 903 to obtain the pattern of different directional beams;

Step 905, according to the test data in steps 902 to 904, analyze the downlink space characteristics of the AAS, and according to the ΔPc obtained in the calibration process, the EIRP can be obtained:

EIRP＝Pt+Gt＝Pg+(Ly-Gh+Ls)＝Pg+ΔPc Formula (3)

Among them, Pt is the output rated power of the active antenna system;

Gt is the gain of the transmitting antenna array element;

Pg is the power value that spectrum analyzer 309 measures;

ΔPc is a calibration parameter.

3) Uplink space characteristic test of active antenna system

Establish the test environment as shown in Figure 4, in the darkroom 401 environment, the active antenna system 402 is installed on the antenna turntable 406, and is connected with the background configuration equipment 408 through the optical fiber 404; the other end, the transmitting antenna 403 is installed on the antenna support 407 , connected to a vector signal generator 409 through a radio frequency cable 405 .

Perform the test according to the steps shown in Figure 10, specifically including the following main steps:

Step 1001, start the active antenna system 402 and the background configuration device 408 and work normally, and make the active antenna system 402 in the receiving mode by configuring parameters in the background, and can receive fixed-point wireless beams in the specified frequency band.

Step 1002, set the vector signal generator 409 to transmit an analog modulation signal of a certain standard (GSM, CDMA, WCDMA or LTE, etc.) in a specified frequency band, and adjust the antenna turntable 406 so that the active antenna system 402 and the transmitting antenna 403 are in the same horizontal and pitch Optimum pointing is achieved on the antenna system 402 so that the measured power value of the active antenna system 402 is the maximum (for the main polarization test) or the minimum (for the cross-polarization test).

Step 1003, the active antenna system 402 performs azimuth rotation on the test turntable, and records its received power value (Rs) as a function of angle. The installation mode (horizontal or vertical) of the active antenna system 402 and the polarization direction of the transmitting antenna 403 can be adjusted separately, and different principal planes (horizontal or vertical) and different polarization patterns can be obtained.

Step 1004, adjusting the configuration parameters of the active antenna system 402 (including the weights of the antenna array elements), repeating steps 1002 and 1003 to obtain the pattern of different directional beams;

Step 1005, according to the test data in steps 1001 to 1004, analyze the uplink spatial characteristics of the AAS; adjust the signal amplitude (Ps) of the vector signal generator 409, so that the demodulation sensitivity of the active antenna system 402 to the modulated signal reaches the minimum, which can be obtained EIRS:

EIRS＝Rs-Gr＝Ps-(Ly-Gh+Ls)＝Ps-ΔPc Formula (4)

where Rs is the received power level detected by the active antenna system;

Gr is the receiving antenna gain;

Ps is the vector signal generator 409 output modulation signal power value;

ΔPc is a calibration parameter.

Since the performance of the antenna array part of the active antenna system is determined by the mechanical properties of the antenna design, it can be guaranteed that in mass production, the performance is stable and can meet the requirements of repeated tests, so the space characteristic test of the active antenna system The spatial characteristics of AAS can be obtained only once or several times.

2. AAS radio frequency index test

The AAS RF index test mainly includes two parts, namely the calibration of the RF test cover and the RF index test of the DUT.

1) RF Test Cover Calibration

RF test cover calibration can be further divided into RF test cover single calibration and RF test cover near-field coupling calibration.

(1) Single-body calibration of the radio frequency test cover: establish the test environment as shown in Figure 5, and then perform the test according to the steps shown in Figure 11. As shown in step 1101 in Fig. 11, a fixed frequency point is set in the designated frequency band, and the S21 parameter between the a interface of the branch connector 503 and the b interface of the antenna array 501 access terminal is tested with a vector network analyzer, and each obtained The differential loss of the branch is G_ab_nm (wherein for the N×M array active antenna system, n=1,...,N; m=1,...,M);

(2) RF test cover near-field coupling calibration: establish a near-field coupling calibration environment as shown in Figure 6, and two standard test covers (calibrated by a single unit) are respectively denoted as test cover A (601) and test cover B (602). The orientations of the antenna feeders of the two test covers are facing each other, and the distance between them is fixed by the installation bracket 605 . The wave-absorbing material 606 is used to reduce the signal interference between the inner elements of the test cover and shield the internal and external signals, so that there is a good space electromagnetic environment between the test cover and the tested object. Then follow the steps shown in Figure 11 to test. As shown in step 1102 in Figure 11, a fixed frequency point is set in the designated frequency band, and a vector network analyzer is used to test the a' interface of the test cover B branch connector port 604 and the a interface of the test cover A branch connector port 603 Between the S21 parameters, the difference between the two test cover branch connector ports is G_a'a_nm (wherein for the N×M array active antenna system, n=1,...,N; m=1,... , M).

Step 1103, if the test cover A is used as the DUT, the difference between the a' interface of the branch connector port 604 of the test cover B and the interface b of the antenna array access port of the DUT (test cover A) can be obtained The loss G_a'b_nm is,

G_a'b_nm=G_a'a_nm-G_ab_nm;

Wherein, for an N×M array active antenna system, n=1,...,N; m=1,...,M;

G_ab_nm is the calibration value of the RF test cover;

G_a'a_nm is the near-field coupling calibration value of the RF test cover.

In step 1104, within the required test frequency band, three frequency points of high, middle and low can be selected to repeat step 1102 and step 1103, and multi-frequency point calibration can also be performed according to the requirement of test accuracy. Finally, mathematical calculations such as interpolation are performed on multiple sets of calibration data to obtain a two-dimensional table or curve corresponding to the calibration frequency and calibration value in the near-field coupling environment. By looking up the table, the calibration value ΔGc of the RF test mask at any frequency point within the specified frequency band can be obtained.

2) RF index test of the DUT

The test environment is established as shown in FIG. 7 , and the DUT AAS701 is installed and positioned in a calibrated test cover 702 , and the test environment is exactly the same as the near-field coupling calibration environment of the test cover. And follow the steps shown in Figure 12 to test:

In step 1201, the gain of each branch needs to be compensated. The approximate value of the compensation is ΔGc by looking up the calibration table in the calibration link. The location of the compensation can be in the digital domain of the active antenna system or in the test instrumentation.

Step 1202, after the radio frequency test cover is compensated, various radio frequency index tests can be performed according to the requirements of the 3GPP protocol for the AAS BS. The test reference point corresponds to the RF port of the active antenna system under test.

To sum up, by adopting the method and device of the present invention, it is possible to implement a comprehensive test on the wireless index of the active antenna system.

Compared with the prior art, the present invention can meet the test requirements of the spatial characteristics and radio frequency characteristics of the active antenna system at the same time, and can well solve the problems of test efficiency and test cost caused by the OTA test method. At the same time, through the radio frequency test This near-field coupling test method and device solves the problem caused by the active antenna device without an external radio frequency port. The device under test can be tested as a black box, which can well inherit the test standards of traditional base stations. , methods, tools and test environment, etc., is an effective and practical test method in equipment production and product certification; on the premise of ensuring test requirements, it saves test costs and improves test efficiency. At the same time, it can be easily used by users. Easy to accept and authenticate.

The above are only preferred implementation examples of the present invention, and are not intended to limit the present invention. The present invention can also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can Various corresponding changes and modifications are made in the present invention, but these corresponding changes and modifications should all belong to the protection scope of the appended claims of the present invention.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

Claims (6)

1. A test method of an active antenna system wireless index, characterized in that, The spatial characteristics of the active antenna system are tested by the spatial radio frequency (OTA) test; Using a near-field coupling method to test the radio frequency index of the active antenna system; The use of near-field coupling to test the radio frequency index of the active antenna system refers to: The active antenna system is placed in a test cover to test the radio frequency index, wherein the test cover includes an antenna array and a passive network part, and the structure and composition of the antenna array are similar to those of the active antenna system antenna. The feeding part is exactly the same; The radio frequency index of the active antenna system is tested in the following manner: Test cover single calibration: calibrate the difference loss and phase offset generated by the test cover itself; Near-field coupling calibration: use two test covers that have been calibrated by the test cover to calibrate the near-field coupling test environment of the test cover; Radio frequency index test: place the active antenna system under test in the calibrated test cover and form a near-field coupling mode between the test cover, and the test environment is the same as the test environment after the near-field coupling calibration; After the test environment is compensated by using the calibration result obtained by the calibration, the radio frequency index test of the active antenna system under test is carried out through the radio frequency test interface on the test cover, and the radio frequency of the active antenna system under test is obtained. RF index of the port. 2. The method according to claim 1, wherein the spatial characteristic test of the active antenna system comprises: Based on a darkroom or a test environment simulating free space, test the pattern of the active antenna system; Calibrating the test environment; The downlink spatial characteristic test and the uplink spatial characteristic test of the active antenna system are respectively carried out, and the equivalent isotropic radiated power (EIRP) and the equivalent isotropic receiving sensitivity (EIRS) are respectively obtained by compensating the pattern of the active antenna system. ). 3. The method according to claim 2, wherein the establishment of the test environment comprises: In a darkroom or simulated free space environment, install the gain reference antenna on the antenna turntable, and connect the gain reference antenna with the vector signal generator through a radio frequency cable; install the receiving antenna on the antenna bracket, and A cable connects the receiving antenna to a spectrum analyzer or power meter. 4. The method according to claim 3, wherein calibrating the test environment specifically comprises: aligning the gain reference antenna with the receiving antenna in a forward direction by adjusting the antenna turntable and the antenna bracket; The vector signal generator is set to transmit a downlink continuous analog signal of a designated frequency band, and the signal is received by the receiving antenna and input to the spectrum analyzer or power meter to obtain the corresponding signal power; Get the calibration parameter ΔPc of the test environment link. 5. The method according to claim 4, wherein the active antenna system downlink space characteristic test specifically comprises: First, in a darkroom or simulated free space environment, the active antenna system is installed on the antenna turntable, and connected to the background configuration equipment through an optical fiber; the receiving antenna is installed on the antenna bracket, and Connect with a spectrum analyzer or a wireless communication comprehensive tester through a radio frequency cable; Then, follow the steps below to test: 11) configuring the active antenna system to be in a transmitting mode, and transmitting a fixed wireless beam of rated power within a specified frequency band; 12) Adjust the antenna turntable so that the active antenna system and the receiving antenna reach the best pointing level and pitch, so that the power value (Pg) received by the spectrum analyzer or wireless communication comprehensive tester is maximum or minimum; 13) Perform azimuth rotation of the active antenna system on the antenna turntable, record the power value Pg measured by the spectrum analyzer as an angle function; and adjust the horizontal or vertical installation mode and The polarization direction of the receiving antenna obtains downlink patterns of different main planes and different polarizations; 14) Adjust the configuration parameters of the active antenna system, repeat the above step 12) and step 13), and test the pattern of different beams of the AAS; 15) Analyze the downlink spatial characteristics of the active antenna system, and obtain the EIRP according to the following formula: EIRP=Pg+ΔPc, where ΔPc is the calibration parameter obtained, and Pg is the power measured by the spectrum analyzer value. 6. The method according to claim 4, wherein said active antenna system uplink space characteristic test specifically comprises: First, in a darkroom or a simulated free space environment, the active antenna system is installed on the antenna turntable, and connected to the background configuration equipment through an optical fiber; The cable is connected with the vector signal generator; Then, follow the steps below to test: 21) Configuring the active antenna system to be in a receiving mode, and receiving fixed-point wireless beams in a specified frequency band; 22) Set the vector signal generator to transmit analog modulated signals in a specified frequency band, adjust the antenna turntable so that the active antenna system and the receiving antenna achieve the best pointing in horizontal and pitch, so that the active The power value received by the antenna system is maximum or minimum; 23) Perform azimuth rotation of the active antenna system on the antenna turntable, and record the received power value (Rs) of the active antenna system as an angle function; and adjust the level or The vertical installation mode and the polarization direction of the transmitting antenna obtain the downlink pattern of different main planes and different polarizations; 24) Adjust the configuration parameters of the active antenna system, repeat the above steps 22) and 23), and test the pattern of different beams of the active antenna system; 25) Analyze the downlink spatial characteristics of the active antenna system, and obtain the EIRS according to the following formula: EIRS=Ps-ΔPc, where ΔPc is the obtained calibration parameter, and Ps is the output modulation of the vector signal generator Signal power value.