CN113162706B - Radio frequency performance test method and system for wireless equipment - Google Patents
Radio frequency performance test method and system for wireless equipment Download PDFInfo
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- CN113162706B CN113162706B CN202010075250.7A CN202010075250A CN113162706B CN 113162706 B CN113162706 B CN 113162706B CN 202010075250 A CN202010075250 A CN 202010075250A CN 113162706 B CN113162706 B CN 113162706B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
Abstract
The invention provides a radio frequency performance test method and a radio frequency performance test system of wireless equipment, wherein the wireless equipment comprises at least one antenna to be tested, and the method comprises the steps of obtaining near-field radiation directional diagram information of the antenna to be tested corresponding to the wireless equipment; generating far-field radiation pattern information of the measured antenna according to the near-field radiation pattern information of the measured antenna corresponding to the wireless equipment; acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position; generating radio frequency characteristic information of the wireless equipment at other test positions according to the radio frequency characteristic information of the wireless equipment at least one arbitrary test position and the far-field radiation pattern information of the tested antenna corresponding to the wireless equipment; and calculating the radio frequency performance of the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at other test positions. Therefore, the radio frequency performance test of the wireless equipment can be more accurate and reliable by obtaining the far field radiation pattern information of the antenna to be tested meeting the far field condition according to the near field radiation pattern information of the antenna to be tested obtained in the near field environment.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and a system for testing radio frequency performance of a wireless device.
Background
The radio frequency performance of wireless devices directly concerns the user experience, and the radio frequency performance directly affects the quality of the communication link. Radio frequency performance testing of wireless devices aims to detect whether the performance of the device meets the use requirements in a laboratory. In order to specify the radio frequency Performance Test of the wireless device, the international Standards organization third Generation Partnership project (3 gpp) and the american Association for wireless communication and Internet Association (CTIA) propose specifications 3gpp ts37.544 and a CTIA Test Plan for Mobile Station Over the Air Performance for the Over-the-Air (OTA) Test of the wireless device, respectively, and the Chinese Communication Standardization Association (CCSA) also propose corresponding Air interface Test Standards to specify the Test flow and the limit value to be reached of the wireless device.
Radio frequency performance tests of wireless devices are classified into two categories, single Input and Single Output (SISO) performance tests and Multiple Input and Multiple Output (MIMO) performance tests, wherein the indices of interest for the SISO wireless performance tests are Total Radiated Power (TRP) and Total Isotropic Sensitivity (TIS).
When SISO wireless performance test is carried out on wireless equipment, required test conditions are that the test distance of a tested piece from the test antenna meets a far field condition. If the testing distance is difficult to meet the far-field condition, additional testing errors are introduced, and especially when the testing distance is short, the error of the testing result of the SISO wireless performance exceeds the error allowable range, and the reliability of the testing result is poor.
In practical situations, when large wireless devices such as vehicles, ships, airplanes and the like are tested, situations often occur in which the testing distance is difficult to meet the far-field condition. Taking a vehicle as an example, when a test environment of the vehicle is built, if a test distance meets a far-field condition, a darkroom which needs to be built is very huge and cannot be basically realized. For this reason, testing for large wireless devices is essentially conducted under near field conditions. However, the error of the test result of the SISO wireless performance test performed under the near-field condition may exceed the error allowable range, and the reliability of the test result is poor.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a method for testing radio frequency performance of a wireless device.
The second objective of the present invention is to provide a radio frequency performance testing system for wireless devices.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a radio frequency performance testing method for a wireless device, where the wireless device includes at least one antenna under test, and the method includes:
acquiring near-field radiation pattern information of a measured antenna corresponding to the wireless equipment;
generating far-field radiation pattern information of the measured antenna according to the near-field radiation pattern information of the measured antenna corresponding to the wireless equipment;
acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position;
generating radio frequency characteristic information of the wireless equipment at other test positions according to the radio frequency characteristic information of the wireless equipment at least one arbitrary test position and the far-field radiation pattern information of the tested antenna corresponding to the wireless equipment;
and calculating the radio frequency performance of the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at other test positions.
Further, the wireless device is carried on the turntable, and the acquiring of the near-field radiation pattern information of the measured antenna corresponding to the wireless device includes:
connecting a vector network analyzer with a tested antenna and a testing antenna corresponding to the at least one wireless device;
and adjusting the angle of the rotary table and the position of the test antenna according to a preset step length to obtain the near-field radiation pattern information of the antenna to be tested corresponding to the wireless equipment.
Further, near-field radiation pattern information of the measured antenna corresponding to the wireless device is converted into far-field radiation pattern information through Fourier transform, spherical wave transform or field source reconstruction algorithm.
Further, before the acquiring the radio frequency characteristic information of the wireless device at least one arbitrary test position, the method further includes:
disconnecting the vector network analyzer from the at least one antenna under test and the test antenna, connecting the at least one antenna under test to a receiver of the wireless device, and connecting the test antenna to a simulation base station.
Further, the radio frequency characteristic information includes Effective Isotropic Radiated Power EIRP (Effective Isotropic Radiated Power) and/or Effective Isotropic Sensitivity EIS (Effective Isotropic Sensitivity).
Further, when the radio frequency characteristic information includes effective isotropic radiation power, generating the radio frequency characteristic information of the wireless device at other test positions according to the radio frequency characteristic information of the wireless device at least one arbitrary test position and far-field radiation pattern information of a measured antenna corresponding to the wireless device includes: obtaining the antenna gain of the antenna to be tested at least one arbitrary test position and the antenna gain of the antenna to be tested at other arbitrary test positions from the far-field radiation pattern information of the antenna to be tested;
calculating power fed to a feed point of the antenna to be tested according to the antenna gain of the antenna to be tested at least one arbitrary test position and the effective isotropic radiation power of the wireless equipment at least one arbitrary test position;
and calculating the effective isotropic radiation power of the wireless equipment at any other test position according to the antenna gain of the antenna to be tested at any other test position and the power of the feed point of the antenna to be tested.
Further, the performing radio frequency performance calculation on the wireless device according to the radio frequency characteristic information of the wireless device at the at least one arbitrary test location and the radio frequency characteristic information of the wireless device at the other test locations includes:
and calculating the total radiation power of the wireless equipment according to the effective isotropic radiation power of the wireless equipment at the at least one arbitrary test position and the effective isotropic radiation power of the wireless equipment at other test positions. 8. The method of claim 5, wherein when the radio frequency characteristic information includes effective isotropic sensitivity, generating the radio frequency characteristic information of the wireless device at other test locations according to the radio frequency characteristic information of the wireless device at least one arbitrary test location and far-field radiation pattern information of a measured antenna corresponding to the wireless device comprises:
obtaining the antenna gain of the antenna to be tested at least one arbitrary test position and the antenna gain of the antenna to be tested at other arbitrary test positions from the far-field radiation pattern information of the antenna to be tested;
calculating the sensitivity of a receiver according to the antenna gain of the antenna to be tested at least one arbitrary test position and the effective isotropic sensitivity of the wireless equipment at least one arbitrary test position;
and calculating the effective isotropic sensitivity of the wireless equipment at any other test position according to the antenna gain of the antenna to be tested at any other test position and the sensitivity of the receiver.
Further, performing radio frequency performance calculation on the wireless device according to the radio frequency characteristic information of the wireless device at the at least one arbitrary test location and the radio frequency characteristic information of the wireless device at the other test locations, including:
and calculating the total isotropic sensitivity of the wireless equipment according to the effective isotropic sensitivity of the wireless equipment in the at least one arbitrary test position and the effective isotropic sensitivity of the wireless equipment in the other test positions.
The radio frequency performance test method of the wireless equipment provided by the embodiment of the invention obtains the near field radiation pattern information of the antenna to be tested corresponding to the wireless equipment; generating far-field radiation pattern information of the measured antenna according to the near-field radiation pattern information of the measured antenna corresponding to the wireless equipment; acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position; generating radio frequency characteristic information of the wireless equipment at other test positions according to the radio frequency characteristic information of the wireless equipment at least one arbitrary test position and the far-field radiation pattern information of the tested antenna corresponding to the wireless equipment; and calculating the radio frequency performance of the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at other test positions. Therefore, even if the antenna test distance cannot meet the far field condition, the radio frequency performance test of the wireless equipment can be carried out by obtaining the far field radiation pattern information of the antenna to be tested meeting the far field condition according to the near field radiation pattern information of the antenna to be tested obtained in the near field environment, and the accuracy and the reliability of the radio frequency performance test of the wireless equipment are improved.
In order to achieve the above object, a second embodiment of the present invention provides a radio frequency performance testing system for a wireless device, where the wireless device includes at least one antenna under test, and the system includes:
the test antenna is positioned inside the microwave darkroom and is connected to the outside of the microwave darkroom through a radio frequency cable;
the rotary table is arranged in the microwave darkroom and used for bearing wireless equipment;
the sliding rail is arranged in the microwave darkroom and used for bearing the test antenna;
a positioning controller arranged outside the microwave darkroom a vector network analyzer, an upper computer, a simulation base station,
The positioning controller is used for controlling the rotary table to rotate under the control of the upper computer and controlling the test antenna to slide in the slide rail so as to change the position of the test antenna;
the vector network analyzer is used for receiving and analyzing the signals of the antenna to be tested and the signals of the test antenna which are received under the conditions that the rotating platform angles are different and the test antenna is located at different positions, so as to obtain the near-field radiation directional diagram information of the antenna to be tested and send the near-field radiation directional diagram information to the upper computer;
the upper computer is used for generating far field radiation pattern information of the antenna to be measured according to the near field radiation pattern information of the antenna to be measured;
the simulation base station is used for transmitting and receiving signals and simultaneously acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position.
The upper computer is further used for generating radio frequency characteristic information of the wireless equipment at other test positions according to the radio frequency characteristic information of the wireless equipment at least one arbitrary test position and the far field radiation pattern information of the tested antenna corresponding to the wireless equipment; and the upper computer is also used for carrying out radio frequency performance calculation on the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at other test positions. According to the radio frequency performance test system of the wireless equipment, even if the antenna test distance cannot meet the far field condition, the radio frequency performance test of the wireless equipment can be carried out by obtaining the far field radiation pattern information of the antenna to be tested meeting the far field condition according to the near field radiation pattern information of the antenna to be tested obtained under the near field environment, and the accuracy and the reliability of the radio frequency performance test of the wireless equipment are improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a SISO test system in the prior art;
fig. 2 is a spherical coordinate system corresponding to the antenna pattern.
Fig. 3 is a schematic flowchart of a radio frequency performance testing method of a wireless device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a radio frequency performance testing system of a wireless device according to an embodiment of the present invention.
Description of the reference numerals:
a microwave darkroom: 1. an upper computer: 2. simulating a base station: 3. a positioning controller: 4
Testing the antenna: 5. a communication antenna: 6. a slide rail: 7. rotating the platform: 8
The wireless device: 9. vector network analyzer: 10
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
FIG. 1 is a schematic diagram of a SISO test system in the prior art. The device comprises a tested piece (the tested piece is wireless equipment) and a 3-dimensional rotary table, wherein the tested piece (the tested piece is wireless equipment) is placed on the 3-dimensional rotary table, a test instrument is used for testing the radio frequency performance of the tested piece, a test antenna is connected with the test instrument through a radio frequency switch, a PC controls the test instrument and a controller, the controller controls the 3-dimensional rotary table in a microwave anechoic chamber after receiving a PC instruction, the wireless equipment is positioned at different angles relative to the test antenna by changing the parameters of the 3-dimensional rotary table, and therefore the radiation performance of the wireless equipment at each angle is obtained through testing. The prior art requires that the distance from the test antenna to the wireless terminal meet the far field. The test of total radiation power TRP and total isotropic sensitivity TIS is illustrated as follows:
and (3) placing the wireless equipment in a microwave darkroom, changing the relative positions of the test antenna and the wireless equipment, realizing wireless performance test sampling at each angle and polarization of the wireless equipment, and finally obtaining the TRP and the TIS.
Fig. 2 is a spherical coordinate system corresponding to the antenna pattern. The origin of the spherical coordinate system is the position of the wireless device. The direction parameters of any position point comprise theta and phi; wherein theta is an included angle between the direction vector r and the positive Z axis, and the range of theta is 0-pi; phi is the included angle between the projection of the direction vector r on the XOY plane and the positive x axis, and the phi range is 0-2 pi. The direction of the direction vector r points to any position point from the origin, and the polarization of any position point comprises: theta and phi polarization.
First, wireless performance indexes of the wireless equipment at each position point are collected, wherein the wireless performance indexes of each position point comprise Effective Isotropic Radiated Power (EIRP) and Effective Isotropic Sensitivity (EIS).
Secondly, performing TRP and TIS calculation according to the acquired wireless performance indexes of each position point, specifically as follows:
wherein EiRP θ (θ, φ) is the EIRP for a location point with the directional parameters θ, φ, which is on the θ polarization; eiRP φ (θ, φ) is the EIRP value for a location point with the orientation parameters θ, φ, in φ polarization.
Wherein, EIS θ (θ, φ) is the EIS of the position point with the orientation parameter θ, φ, on the θ polarization;
EIS φ (θ, φ) is the EIS for a location point with the orientation parameters θ, φ on φ polarization.
However, prior art SISO testing generally requires that far-field conditions be satisfied, i.e., that the test distance satisfy the following formula:
wherein, R is the testing distance, D is the size of the tested piece, and lambda is the wavelength.
And if the testing distance is difficult to meet the far-field condition, additional testing errors are introduced, and particularly when the testing distance is short, the error of the testing result of the SISO wireless performance exceeds the error allowable range, and the reliability of the testing result is poor.
In practical situations, when large wireless devices such as vehicles, ships, airplanes and the like are tested, situations often occur in which the testing distance is difficult to meet the far-field condition. Taking a vehicle as an example, when a test environment of the vehicle is built, if a test distance meets a far-field condition, a darkroom which needs to be built is very huge and cannot be basically realized. For this reason, testing for large wireless devices is essentially performed under near-field conditions. However, the error of the test result of the SISO wireless performance test performed under the near-field condition may exceed the error allowable range, and the reliability of the test result is poor.
In order to solve the above technical problems, the present invention provides a method and a system for testing radio frequency performance of a wireless device, so as to achieve more accurate evaluation of radio frequency performance of the wireless device.
The following describes a radio frequency performance testing method and system of a wireless device according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 3 is a flowchart illustrating a radio frequency performance testing method of a wireless device according to an embodiment of the present invention. As shown in fig. 3, the method for testing the radio frequency performance of the wireless device includes the following steps:
s101, obtaining near-field radiation pattern information of a measured antenna corresponding to the wireless equipment.
In this embodiment, the wireless device includes at least one measured antenna. The wireless device may be any device having a wireless communication function, such as a vehicle, a mobile phone, a computer, a wearable device, and the like, but is not limited thereto.
The near-field radiation pattern information of the antenna to be tested can be understood as antenna pattern information of the antenna to be tested, which is obtained by performing antenna pattern test in a near-field area of the antenna to be tested. It should be noted that the antenna pattern test belongs to the prior art, and more details are described in the related art.
Optionally, in order to more comprehensively and accurately obtain the near-field radiation pattern information of the antenna to be tested, the wireless device is supported on the turntable, and the vector network analyzer is connected with at least one antenna to be tested and the test antenna; and adjusting the angle of the turntable and the position of the test antenna according to the preset step length to acquire the near-field radiation directional diagram information of the antenna to be tested.
Specifically, the turntable is arranged in the microwave darkroom, the wireless equipment is carried on the turntable, and the test antenna is positioned inside the microwave darkroom and connected to the outside of the microwave darkroom through the radio frequency cable. The vector network analyzer is positioned outside the microwave darkroom and is connected with at least one tested antenna of the wireless equipment and simultaneously connected with the test antenna. And continuously adjusting the angle of the rotary table and the position of the test antenna, and receiving and analyzing the signal of the antenna to be tested and the signal of the test antenna received under the condition that different rotary table angles and different positions of the test antenna are positioned by the vector network analyzer so as to test a radiation pattern of the antenna to be tested and obtain the near-field radiation pattern information of the antenna to be tested.
S102, generating far-field radiation pattern information of the measured antenna according to the near-field radiation pattern information of the measured antenna corresponding to the wireless equipment.
In this embodiment, based on a near-field-far-field conversion method, near-field radiation pattern information of the measured antenna is converted into far-field radiation pattern information of the measured antenna. The near-field to far-field conversion method is, for example, a fourier transform, a spherical wave transform, or a field source reconstruction algorithm, but not limited thereto.
S103, acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position.
Wherein the radio frequency characteristic information comprises an effective isotropic radiation power and/or an effective isotropic sensitivity.
Specifically, when the wireless device is at any test position, the effective isotropic radiation power and/or the effective isotropic sensitivity corresponding to the wireless device at any test position are/is obtained. The corresponding effective isotropic radiation power and/or effective isotropic sensitivity of the wireless device at any test position can be tested by using the existing test instrument. The test instrument has the function of measuring the effective isotropic radiation power and/or the effective isotropic sensitivity of the antenna.
Preferably, in order to perform the radio frequency performance calculation on the wireless device more accurately, the radio frequency characteristic information of the wireless device at a plurality of arbitrary test positions can be obtained. A plurality is to be understood as 2 or more than 2.
S104, generating radio frequency characteristic information of the wireless device at other test positions according to the radio frequency characteristic information of the wireless device at least one arbitrary test position and the far-field radiation pattern information of the tested antenna corresponding to the wireless device. Specifically, according to the definition of effective isotropic radiation power and effective isotropic sensitivity, the following formula can be obtained:
EiRP x (θ,φ)＝P T *G x (θ,φ) (4)
EIS x (θ,φ)＝P S /G x (θ,φ) (5)
wherein EiRP x (theta, phi) is the effective isotropic radiation power EIRP, P of the antenna corresponding to the tested piece in the angle (theta, phi) and the x polarization T Is the power fed to the antenna feed point of the piece under test, G x (theta, phi) is the gain of the antenna of the piece under test at the (theta, phi) angle, x-polarization. As can be seen from (4), the ratio of EIRP at different angles and polarizations is equal to the ratio of antenna gain at the corresponding angles and polarizations.
Wherein, EIS x (θ, φ) is the EIS value, P, of the antenna of the tested piece at the angle (θ, φ) and x-polarization S Is the receiver sensitivity, G x (theta, phi) is the gain of the antenna of the piece under test at the (theta, phi) angle, x-polarization. From (5), the ratio of the effective isotropic sensitivity EIS at different angles and polarizations is equal to the inverse of the ratio of the antenna gain at the corresponding angle and polarization.
According to the descriptions of the formulas (4) and (5), after the radio frequency characteristic information of the wireless equipment at least one arbitrary test position is obtained, the radio frequency characteristic information of the wireless equipment at other test positions can be deduced, the radio frequency characteristic information of a plurality of positions does not need to be tested one by one, and the test efficiency is improved.
Specifically, when the radio frequency characteristic information includes the effective isotropic radiation power, the step S104 is specifically: obtaining the antenna gain of the antenna to be tested at least one arbitrary test position and the antenna gain of the antenna to be tested at other arbitrary test positions from the far-field radiation pattern information of the antenna to be tested; calculating power fed into a feed point of the antenna to be tested according to the antenna gain of the antenna to be tested at least one arbitrary test position and the effective isotropic radiation power of the wireless equipment at least one arbitrary test position; and calculating the effective isotropic radiation power of the wireless equipment at any other test position according to the antenna gain of the antenna to be tested at any other test position and the power of the feed point of the antenna to be tested. For any test position of the wireless equipment, determining relevant parameters of the tested antenna of the wireless equipment at the any test position, wherein the relevant parameters comprise (theta, phi) angle and polarization. Further acquiring antenna gain of the antenna to be measured at any test position from the far-field radiation pattern information of the antenna to be measured according to the related parameters; therefore, the antenna gain of the antenna to be tested at any test position and the effective isotropic radiation power of the wireless equipment at any test position are substituted into the formula (4), and the power of the feed point of the antenna to be tested is obtained.
Similarly, for any test position of the wireless device, relevant parameters of the tested antenna of the wireless device at any test position are determined, and the relevant parameters comprise (theta, phi) angle and polarization. And further acquiring the antenna gain of the antenna to be measured at other test positions from the far-field radiation pattern information of the antenna to be measured according to the related parameters. Therefore, the antenna gain and the power of the feed point of the antenna to be tested when the antenna to be tested is at other test positions are substituted into the formula (4), and the effective isotropic radiation power of the wireless equipment at other test positions is obtained.
Specifically, when the radio frequency characteristic information includes effective isotropic sensitivity, step S104 is specifically: obtaining the antenna gain of the antenna to be tested at least one arbitrary test position and the antenna gain of the antenna to be tested at other arbitrary test positions from the far-field radiation pattern information of the antenna to be tested; calculating the sensitivity of a receiver according to the antenna gain of the antenna to be tested at least one arbitrary test position and the effective isotropic sensitivity of the wireless equipment at least one arbitrary test position; and calculating the effective isotropic sensitivity of the wireless equipment at any other test position according to the antenna gain of the antenna to be tested at any other test position and the sensitivity of the receiver.
Determining relevant parameters of a tested antenna of the wireless equipment at any test position for any test position of the wireless equipment, wherein the relevant parameters comprise (theta, phi) angles and polarization, and acquiring antenna gain of the tested antenna at any test position from far-field radiation pattern information of the tested antenna according to the relevant parameters; therefore, the antenna gain of the antenna to be tested at any test position and the effective isotropic sensitivity of the wireless device at any test position are substituted into the formula (5), and the receiver sensitivity is obtained.
Similarly, for any test position of the wireless device, relevant parameters of the tested antenna of the wireless device at any test position are determined, and the relevant parameters comprise (theta, phi) angle and polarization. And further acquiring the antenna gain of the antenna to be measured at other test positions from the far-field radiation pattern information of the antenna to be measured according to the related parameters. Therefore, the antenna gain and the receiver sensitivity of the tested antenna at other testing positions are substituted into the formula (5), and the effective isotropic sensitivity of the wireless device at other testing positions is obtained.
S105, calculating the radio frequency performance of the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at other test positions.
Specifically, after radio frequency characteristic information of the wireless device at each test position is obtained, the total radiation power TRP of the wireless device can be calculated according to formula (1), or the total isotropic sensitivity TIS of the wireless device can be calculated according to formula (2), and the radio frequency performance test is completed.
And aiming at calculating the total radiation power TRP of the wireless equipment, calculating the total radiation power of the wireless equipment according to the effective isotropic radiation power of the wireless equipment at the at least one arbitrary test position and the effective isotropic radiation power of the wireless equipment at other test positions. Specifically, after the effective isotropic radiation power of the wireless device at each test position is obtained, the total radiation power TRP of the antenna to be tested can be calculated according to the formula (1).
And aiming at calculating the total isotropic sensitivity TIS of the wireless equipment, calculating the total isotropic sensitivity of the wireless equipment according to the effective isotropic sensitivity of the wireless equipment in at least one arbitrary test position and the effective isotropic sensitivity of the wireless equipment in other test positions. Specifically, after the effective isotropic sensitivity of the wireless device at each test position is obtained, the total radiated power TIS of the antenna to be tested can be calculated according to the formula (2).
Further, before acquiring the radio frequency characteristic information of the wireless device at least one arbitrary test position, the method further includes: disconnecting the vector network analyzer from the at least one antenna under test and the test antenna, connecting the at least one antenna under test to a receiver of the wireless device, and connecting the test antenna to the simulation base station.
Specifically, after the near-field radiation pattern information of the antenna under test is acquired by the vector network analyzer, the vector network analyzer needs to be disconnected from at least one of the antenna under test and the test antenna. And simultaneously, at least one tested antenna is connected with a receiver of the wireless equipment, and the tested antenna is connected with the simulation base station, so that the signals output by the simulation base station can be input into the receiver of the wireless equipment through the tested antenna and the at least one tested antenna.
The radio frequency performance test method of the wireless equipment provided by the embodiment of the invention comprises the steps that the wireless equipment comprises at least one antenna to be tested, and the near-field radiation directional diagram information of the antenna to be tested corresponding to the wireless equipment is obtained; generating far-field radiation pattern information of the measured antenna according to the near-field radiation pattern information of the measured antenna corresponding to the wireless equipment; acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position; generating radio frequency characteristic information of the wireless equipment at other test positions according to the radio frequency characteristic information of the wireless equipment at least one arbitrary test position and the far-field radiation pattern information of the tested antenna corresponding to the wireless equipment; and calculating the radio frequency performance of the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at other test positions. Therefore, even if the antenna test distance cannot meet the far field condition, the radio frequency performance test of the wireless equipment can be carried out by obtaining the far field radiation pattern information of the antenna to be tested meeting the far field condition according to the near field radiation pattern information of the antenna to be tested obtained in the near field environment, and the accuracy and the reliability of the radio frequency performance test of the wireless equipment are improved.
Fig. 4 is a schematic structural diagram of a radio frequency performance testing system of a wireless device according to an embodiment of the present invention. The wireless device 9 includes at least one antenna under test (not shown in fig. 4), and as shown in fig. 4, the radio frequency performance testing system of the wireless device includes:
the test antenna 5 is positioned inside the microwave darkroom 1, and is connected to the outside of the microwave darkroom through a radio frequency cable;
the rotary table 8 is arranged in the microwave darkroom 1 and is used for bearing the wireless equipment 9;
the slide rail 7 is arranged in the microwave darkroom 1 and is used for bearing the test antenna 5;
the positioning controller 4, the vector network analyzer 10, the upper computer 2 and the simulation base station 3 are arranged outside the microwave darkroom 1;
the positioning controller 4 is used for controlling the rotary table 8 to rotate under the control of the upper computer 2 and controlling the test antenna 5 to slide in the slide rail 7 so as to change the position of the test antenna 5;
the vector network analyzer 10 is configured to receive and analyze the signal of the antenna under test and the signal of the test antenna received under the condition that the test antenna is at different positions at different turntable angles, so as to obtain near-field radiation pattern information of the antenna under test and send the near-field radiation pattern information to the upper computer 2;
the upper computer 2 is used for generating far field radiation directional diagram information of the antenna to be measured according to the near field radiation directional diagram information of the antenna to be measured;
the simulation base station 3 is used for transmitting and receiving signals and acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position;
the upper computer 2 is further configured to generate radio frequency characteristic information of the wireless device at other test positions according to the radio frequency characteristic information of the wireless device at least one arbitrary test position and far-field radiation pattern information of the measured antenna corresponding to the wireless device.
How the radio frequency performance testing system of the wireless device 9 performs the radio frequency performance testing method of the wireless device is described below, specifically as follows:
it should be noted that the wireless device in fig. 4 is a vehicle as an example, but is not limited to a vehicle.
First, a test environment needs to be set up.
A turntable 8, a slide rail 7 and a vehicle 9 are arranged in the microwave darkroom 1. Wherein the vehicle 9 is arranged above the turntable 8.
Outside the microwave anechoic chamber 1, a vector network analyzer 10, a simulation base station 3, a positioning controller 4, an upper computer 2, a preparation test antenna 5 (which can be a horn antenna) and two communication antennas 6 are arranged. Wherein, test antenna 5, communication antenna 6, all are located the inside of microwave darkroom 1, and test antenna 5 communication antenna 6 all connects the outside of microwave darkroom 1 through the radio frequency cable, and it needs to point out that test antenna 5 slidable mounting is in slide rail 7, and test antenna 5 can slide along slide rail 7. The communication antenna 6 is used to establish a communication connection.
Secondly, after the test environment is built, testing is started, and the specific flow is as follows:
the first step is as follows: the step of obtaining near field radiation pattern information of the antenna under test is performed.
Specifically, the vector network analyzer 10 is connected to at least one antenna under test (not shown in fig. 4) in the vehicle 9 and to the test antenna 5, respectively. The upper computer 2 is respectively connected with the positioning controller 4 and the vector network analyzer 10. The upper computer 2 sends a signal to the simulation base station so that the simulation base station can transmit the signal, the upper computer 2 feeds a control instruction to the positioning controller 11 of the test antenna, and the positioning controller 4 responds to the received control instruction of the upper computer 2 and adjusts the angle of the rotary table 8 and the position of the test antenna 5 in the slide rail 7 according to a preset step length. The vector network analyzer 10 analyzes the information of the antenna to be tested received at different turntable angles and different positions of the antenna to be tested 5, so as to perform radiation pattern test on the antenna to be tested and obtain the near-field radiation pattern information of the antenna to be tested. The vector network analyzer 10 uploads the obtained near-field radiation pattern information of the antenna to be measured to the upper computer, and the step of obtaining the near-field radiation pattern information of the antenna to be measured is completed.
The second step is that: and executing the generation of the far-field radiation pattern information of the measured antenna according to the near-field radiation pattern information of the measured antenna corresponding to the wireless equipment.
Specifically, after acquiring the near-field radiation pattern information of the measured antenna, the upper computer 2 converts the near-field radiation pattern information of the measured antenna into the far-field radiation pattern information of the measured antenna based on a near-field to far-field conversion method. The near-field to far-field conversion method is, for example, a fourier transform, a spherical wave transform, or a field source reconstruction algorithm, but not limited thereto.
The third step: obtaining radio frequency characteristic information of the wireless device at least one arbitrary test location is performed.
Specifically, after the near field radiation pattern information of the antenna under test is acquired by the vector network analyzer 10, the vector network analyzer 10 is disconnected from at least one antenna under test and the test antenna 5. At the same time, at least one tested antenna is connected with the receiver of the wireless device, and the test antenna 5 is connected with the simulation base station 3, so that the signal output by the simulation base station 3 can be input into the receiver of the wireless device 9 through the test antenna and at least one tested antenna to test the wireless device 9.
The simulation base station 3 can test the effective isotropic sensitivity of the wireless device at any test position and the effective isotropic radiation power at any test position.
Specifically, the upper computer 2 controls the simulation base station 3 to transmit signals, and the signals transmitted by the simulation base station 3 are fed into the wireless device through the test antenna 5. At this time, the simulation base station 3 can test the effective isotropic sensitivity of the wireless device at any test position and the effective isotropic radiation power at any test position, and upload the effective isotropic radiation power to the upper computer 2.
The fourth step: and executing the step of generating the radio frequency characteristic information of the wireless device at other test positions according to the radio frequency characteristic information of the wireless device at least one arbitrary test position and the far-field radiation pattern information of the tested antenna corresponding to the wireless device.
The fifth step: and executing the step of calculating the radio frequency performance of the wireless equipment according to the radio frequency characteristic information of the wireless equipment in at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment in other test positions.
And the fourth step and the fifth step are executed by an upper computer, and the upper computer performs radio frequency performance test on the wireless equipment according to the radio frequency characteristic information of the wireless equipment at any test position uploaded by the test instrument and the far field radiation pattern information of the tested antenna corresponding to the wireless equipment uploaded by the vector network analyzer 10.
It should be noted that the foregoing explanation of the embodiment of the method for testing radio frequency performance of a wireless device is also applicable to the radio frequency performance testing system of the wireless device of the embodiment, and the implementation principle is similar, which is not described herein again.
According to the radio frequency performance test system of the wireless equipment, even if the antenna test distance cannot meet the far field condition, the radio frequency performance test of the wireless equipment can be carried out according to the near field radiation pattern information of the antenna to be tested, which is obtained in the near field environment, and the far field radiation pattern information of the antenna to be tested, which meets the far field condition, so that the accuracy and the reliability of the radio frequency performance test of the wireless equipment are improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Further, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A method for radio frequency performance testing of a wireless device, the wireless device including at least one antenna under test, the method comprising:
acquiring near-field radiation pattern information of a measured antenna corresponding to the wireless equipment;
generating far-field radiation pattern information of the measured antenna according to the near-field radiation pattern information of the measured antenna corresponding to the wireless equipment;
acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position;
generating radio frequency characteristic information of the wireless equipment at other test positions according to the radio frequency characteristic information of the wireless equipment at least one arbitrary test position and the far-field radiation pattern information of the tested antenna corresponding to the wireless equipment;
and performing radio frequency performance calculation on the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at the other test positions.
2. The method for testing radio frequency performance of a wireless device according to claim 1, wherein the wireless device is carried on a turntable, and the obtaining the near-field radiation pattern information of the measured antenna corresponding to the wireless device includes:
connecting a vector network analyzer with a tested antenna and a test antenna in the wireless equipment;
and adjusting the angle of the rotary table and the position of the test antenna according to a preset step length to obtain the near-field radiation pattern information of the antenna to be tested corresponding to the wireless equipment.
3. The method of claim 1, wherein near-field radiation pattern information of a measured antenna corresponding to the wireless device is converted into the far-field radiation pattern information by a fourier transform, a spherical wave transform, or a field source reconstruction algorithm.
4. The method for testing radio frequency performance of a wireless device according to claim 2, wherein before said obtaining radio frequency characteristic information of said wireless device at least one arbitrary test location, further comprising:
disconnecting the vector network analyzer from the at least one antenna under test and the test antenna, connecting the at least one antenna under test to a receiver of the wireless device, and connecting the test antenna to a simulation base station.
5. The radio frequency performance test method of a wireless device according to claim 1, wherein the radio frequency characteristic information includes Effective Isotropic Radiated Power (EIRP) and/or Effective Isotropic Sensitivity (EIS).
6. The method for radio frequency performance testing of a wireless device of claim 5, wherein when the radio frequency characteristic information includes effective isotropic radiated power, generating the radio frequency characteristic information of the wireless device at other test locations based on the radio frequency characteristic information of the wireless device at least one arbitrary test location and far-field radiation pattern information of a measured antenna corresponding to the wireless device comprises: obtaining the antenna gain of the antenna to be tested at least one arbitrary test position and the antenna gain of the antenna to be tested at other arbitrary test positions from the far-field radiation pattern information of the antenna to be tested;
calculating power fed to a feed point of the antenna to be tested according to the antenna gain of the antenna to be tested at least one arbitrary test position and the effective isotropic radiation power of the wireless equipment at least one arbitrary test position;
and calculating the effective isotropic radiation power of the wireless equipment at any other test position according to the antenna gain of the antenna to be tested at any other test position and the power of the feed point of the antenna to be tested.
7. The method for testing radio frequency performance of a wireless device according to claim 6, wherein the calculating radio frequency performance of the wireless device according to the radio frequency characteristic information of the wireless device at the at least one arbitrary test location and the radio frequency characteristic information of the wireless device at the other test locations comprises:
and calculating the total radiation power of the wireless equipment according to the effective isotropic radiation power of the wireless equipment at the at least one arbitrary test position and the effective isotropic radiation power of the wireless equipment at other test positions.
8. The method of claim 5, wherein when the radio frequency characteristic information includes effective isotropic sensitivity, generating the radio frequency characteristic information of the wireless device at other test locations according to the radio frequency characteristic information of the wireless device at least one arbitrary test location and far-field radiation pattern information of a measured antenna corresponding to the wireless device comprises:
obtaining the antenna gain of the antenna to be tested at least one arbitrary test position and the antenna gain of the antenna to be tested at other arbitrary test positions from the far-field radiation pattern information of the antenna to be tested;
calculating the sensitivity of a receiver according to the antenna gain of the antenna to be tested at least one arbitrary test position and the effective isotropic sensitivity of the wireless equipment at least one arbitrary test position;
and calculating the effective isotropic sensitivity of the wireless equipment at any other test position according to the antenna gain of the antenna to be tested at any other test position and the sensitivity of the receiver.
9. The method for testing radio frequency performance of a wireless device according to claim 8, wherein performing the radio frequency performance calculation on the wireless device according to the radio frequency characteristic information of the wireless device at the at least one arbitrary test location and the radio frequency characteristic information of the wireless device at the other test locations comprises:
and calculating the total isotropic sensitivity of the wireless equipment according to the effective isotropic sensitivity of the wireless equipment in the at least one arbitrary test position and the effective isotropic sensitivity of the wireless equipment in the other test positions.
10. A radio frequency performance testing system for a wireless device, the wireless device including at least one antenna under test, the system comprising:
the test antenna is positioned inside the microwave darkroom and is connected to the outside of the microwave darkroom through a radio frequency cable;
the rotary table is arranged in the microwave darkroom and used for bearing wireless equipment;
the sliding rail is arranged in the microwave darkroom and used for bearing the test antenna;
the positioning controller, the vector network analyzer, the upper computer and the simulation base station are arranged outside the microwave darkroom;
the positioning controller is used for controlling the rotary table to rotate under the control of the upper computer and controlling the test antenna to slide in the slide rail so as to change the position of the test antenna;
the vector network analyzer is used for receiving and analyzing the signals of the antenna to be tested and the signals of the test antenna which are received under the conditions that the rotating table angles are different and the test antenna is located at different positions, so as to obtain the near-field radiation pattern information of the antenna to be tested and send the near-field radiation pattern information to the upper computer;
the upper computer is used for generating far field radiation pattern information of the antenna to be measured according to the near field radiation pattern information of the antenna to be measured;
the simulation base station is used for transmitting and receiving signals, the transmitted signals are fed into the test antenna, and meanwhile, the simulation base station is used for acquiring radio frequency characteristic information of the wireless equipment at least one arbitrary test position;
the upper computer is further used for generating radio frequency characteristic information of the wireless equipment at other test positions according to the radio frequency characteristic information of the wireless equipment at least one arbitrary test position and the far field radiation pattern information of the tested antenna corresponding to the wireless equipment;
and the upper computer is also used for carrying out radio frequency performance calculation on the wireless equipment according to the radio frequency characteristic information of the wireless equipment at the at least one arbitrary test position and the radio frequency characteristic information of the wireless equipment at other test positions.
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| US11515952B1 (en) | 2021-12-14 | 2022-11-29 | Mediatek Inc. | Testing method and testing system for evaluating radio device |
| TWI797887B (en) * | 2021-12-14 | 2023-04-01 | 聯發科技股份有限公司 | Testing method and testing system for determining radiation performance of a device under test (dut) |
| CN114070428B (en) * | 2022-01-11 | 2022-03-29 | 中国信息通信研究院 | Method and system for testing active performance of finished automobile antenna |
| CN115378518B (en) * | 2022-09-19 | 2023-04-07 | 深圳市中承科技有限公司 | Radio frequency communication equipment space radiation test system and method based on deep learning |
| CN116973819B (en) * | 2023-09-22 | 2023-12-12 | 上海优立检测技术股份有限公司 | Three-dimensional testing method, system and storage medium for microwave electromagnetic parameters |
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