CN112564828A - OTA (over the air) test system and method for 5G (the third generation telecommunication) large-scale array antenna test - Google Patents
OTA (over the air) test system and method for 5G (the third generation telecommunication) large-scale array antenna test Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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Abstract
The invention provides an OTA test system and method for 5G large-scale array antenna test, comprising the following steps: returning an in-place confirmation signal to the multitask control device when the near-field sampling probe reaches one spatial sampling point position; the multitask control device responds to the signal in real time and sequentially sends the stored test task information to the array surface control device; the array surface control device sequentially generates corresponding beams to be detected; the large-scale array antenna equipment to be tested and the near field sampling probe transmit or receive test signals; converting the radio frequency test signal into an IQ test signal by the large-scale array antenna equipment to be tested, generating an IQ reference signal and sending the IQ reference signal to a test computer; and the test computer normalizes the IQ test digital signal based on the IQ reference digital signal and determines the OTA performance index of the large-scale array antenna equipment to be tested through near-far field transformation. The OTA performance test of a plurality of wave beam states under a plurality of frequency points of the equipment to be tested can be completed by single scanning of the scheme.
Description
Technical Field
The invention relates to the technical field of OTA (over the air) test, in particular to a 5G large-scale array antenna test-oriented OTA test system and a method.
Background
With the development of mobile broadband networks (5G, 6G), the future of mobile communication antennas is developing towards large-scale array, multi-frequency, multi-beam, active integration, and miniaturization. The rapid development of mobile communication antenna technology and antenna industry scale brings a new challenge to the antenna test precision, test efficiency and test function of antenna measurement field.
The introduction of Massive MIMO large-scale array antennas and a new frequency spectrum of a millimeter wave frequency band is a key technology for realizing the great improvement of the frequency spectrum efficiency and the system capacity by 5G. The large-scale antenna array can support a plurality of independent spatial data streams by increasing the number of antennas on the basis of the existing multi-antenna, and the frequency spectrum efficiency of a multi-user system is multiplied. In a millimeter wave frequency band, a phased array antenna mode is adopted, and through a beam forming technology, antenna gain is improved to compensate high path loss of the frequency band. The introduction of the new technology brings great challenges to the test certification of the 5G base station equipment in the future.
At present, the test systems adopted by domestic main antenna equipment manufacturers can be divided into two types, namely a spherical near-field test system and a far-field (compact range) test system:
a spherical near-field test system is mainly used for testing a large-scale passive array antenna directional pattern (gain, front-to-back ratio, cross polarization and the like). And (3) applying single-tone test to quickly obtain the passive three-dimensional directional diagram of the antenna to be tested in a near-far field transformation mode for each wave beam state. And modifying the assignment of the weight simulator, and repeating the test until the test of all the states of the wave beams to be tested is completed.
Far-field (compact field) test system: and configuring the equipment to be tested to work in an appointed state, and directly searching and acquiring the information of the wave beam to be tested through the rotation of the rotary table. Based on a far-field (compact field) test system, the method can measure passive antenna directional pattern information, and can also complete the measurement of 5G large-scale array antenna base station (including BBU, Building base and Unit, Baseband processing Unit) OTA performance (EIRP, Effective Isotropic Radiated Power and EIS, Effective Isotropic reception Sensitivity).
The 5G large-scale array antenna system is a system architecture based on deep fusion of a large-scale antenna array and a multi-channel radio frequency device, and an antenna and the radio frequency device are difficult to split, so that a base station test has to break through the traditional passive antenna directional diagram and conducted radio frequency index test mode, combines an antenna index and a radio frequency index together, and adopts an OTA test scheme; in order to meet the requirement of 5G diversified application scenes, the beam radiation characteristics of a large-scale antenna array system tend to be complex, and the antenna radiation characteristic test also needs to be evolved from the traditional one-dimensional single beam form test to a three-dimensional multiple beam form test; different from a traditional passive base station antenna or analog beam forming framework, the 5G large-scale array antenna system adopts a digital or digital-analog mixed beam forming framework, and great challenges are provided for the test precision and the test efficiency of a test system. Based on this, the shortcomings of the conventional base station antenna test system are mainly reflected in that:
for a spherical near-field test system: in a traditional passive base station antenna or an array antenna with an analog beam forming architecture, uplink and downlink signals are synchronous coherent radio frequency signals, and a closed loop test link is constructed by taking a vector network analyzer as a core; for a digital or digital-analog hybrid beam forming architecture, a complete and same-frequency radio frequency signal closed-loop link does not exist in the uplink and the downlink, the basis of synchronous phase coherence is lost, and a closed-loop test link cannot be constructed by taking a vector network analyzer as a core. The extraction of near-field amplitude and phase information is further completed by improving and introducing a reference signal with synchronous phase coherence, and the method becomes a main difficulty of the existing near-field test system.
For far-field (compact field) test systems: the far field (compact range) construction scale meeting the test requirements of a 5G large-scale array antenna system is huge, and the darkroom construction cost is extremely high; in the face of the tendency of complex beam radiation characteristics of a 5G large-scale antenna array system, the process of searching a main beam and a test section is long, and the efficiency is low.
In addition, no matter a far-field (compact field) or spherical near-field test system, only one beam state can be measured by a single scan, and the engineering test requirement under the complex beam radiation scene in the 5G era is difficult to meet.
Disclosure of Invention
The embodiment of the invention provides an OTA test system for 5G large-scale array antenna test, which comprises: the device comprises a multitask control device, a near-field sampling probe, a comprehensive frequency source, a front surface control device and a test computer;
the near field sampling probe is for: traversing each spatial sampling point under the control of a test computer, and returning an in-place confirmation signal to the multitask control device when each spatial sampling point is reached;
the multitask control device is used for: storing test task information, wherein the test task information comprises all test frequency information and transmit-receive beam pointing state information to be tested; responding the in-place confirmation signal in real time under the control of a test computer, and sequentially sending the test task information to the array surface control device;
the front surface control means is for: responding each state information to be tested sent by the multitask control module in real time, generating a corresponding state control instruction, controlling a comprehensive frequency source and the large-scale array antenna equipment to be tested to synchronously switch test frequency according to the corresponding state control instruction, and controlling the large-scale array antenna equipment to be tested to switch a receiving/transmitting beam pointing state;
the integrated frequency source is for: under the corresponding state control instruction, providing a synchronous clock and a local oscillator for the test system and the large-scale array antenna equipment to be tested;
the near field sampling probe is further operable to: when the emission characteristic of the large-scale array antenna equipment to be tested is tested, receiving a radio frequency test signal radiated by the large-scale array antenna equipment to be tested, and sending the radio frequency test signal to the monitoring T/R component of the large-scale array antenna equipment to be tested; when the receiving characteristic of the large-scale array antenna equipment to be tested is tested, receiving the radio frequency test signal output by the monitoring T/R component and radiating the radio frequency test signal to the large-scale array antenna equipment to be tested;
the large-scale array antenna equipment monitoring T/R component to be tested is used for: carrying out digital sampling on the radio frequency test signal to generate an IQ test digital signal; generating an IQ reference digital signal; sending the IQ test digital signal and the IQ reference digital signal to a test computer;
the test computer is used for: normalizing the IQ test digital signal based on the IQ reference digital signal to form complete amplitude-phase distribution, and determining OTA performance index of the large-scale array antenna equipment to be tested through near-far field transformation; the whole test system is controlled in a dispatching mode, and real-time synchronous control of probe moving sampling, multi-task state switching, test data acquisition and test data processing analysis is achieved.
The embodiment of the invention also provides an OTA test method for 5G large-scale array antenna test, which comprises the following steps:
the near-field sampling probe traverses each space sampling point under the control of the test computer, and returns an in-place confirmation signal to the multitask control device when reaching one space sampling point;
the multi-task control device stores test task information, wherein the test task information comprises all test frequencies to be tested and directional state information of the transmitting and receiving wave beams; responding to the in-place confirmation signal under the control of a test computer, and sequentially sending the test task information to the array surface control device;
the array surface control device responds to each piece of state information to be tested sent by the multitask control module in real time, generates a corresponding state control instruction, controls the comprehensive frequency source and the large-scale array antenna equipment to be tested to synchronously switch the test frequency according to the corresponding state control instruction, and controls the large-scale array antenna equipment to be tested to switch the beam receiving/transmitting pointing state;
under the corresponding state control instruction, the comprehensive frequency source provides a synchronous clock and a local oscillator for the test system and the large-scale array antenna equipment to be tested;
when the emission characteristic of the large-scale array antenna equipment to be tested is tested, the near-field sampling probe receives a radio frequency test signal radiated by the large-scale array antenna equipment to be tested and sends the radio frequency test signal to a monitoring T/R component of the large-scale array antenna equipment to be tested; when the receiving characteristic of the large-scale array antenna equipment to be tested is tested, receiving the radio frequency test signal output by the monitoring T/R component and radiating the radio frequency test signal to the large-scale array antenna equipment to be tested;
monitoring a radio frequency test signal by a T/R component of large-scale array antenna equipment to be tested, and carrying out digital sampling on the radio frequency test signal to generate an IQ test digital signal; generating an IQ reference digital signal; sending the IQ test digital signal and the IQ reference digital signal to a test computer;
the testing computer normalizes the IQ testing digital signal based on the IQ reference digital signal to form complete amplitude-phase distribution, and determines the OTA performance index of the large-scale array antenna equipment to be tested through near-far field transformation; the whole test system is controlled in a dispatching mode, and real-time synchronous control of probe moving sampling, multi-task state switching, test data acquisition and test data processing analysis is achieved.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium stores a computer program for executing the method.
In the embodiment of the invention, the OTA performance test of a plurality of wave beam states under a plurality of frequency points of the equipment to be tested can be completed by single scanning in a multi-task parallel processing mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an OTA testing system for 5G large-scale array antenna testing according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of a large-scale array antenna device to be tested according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a large-scale array antenna device to be tested according to an embodiment of the present invention;
fig. 4 is a flowchart of an OTA testing method for 5G large-scale array antenna testing according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, an OTA testing system for 5G large-scale array antenna testing is provided, as shown in fig. 1, the system includes: the device comprises a multitask control device, a near-field sampling probe, a comprehensive frequency source, a front surface control device and a test computer;
the near field sampling probe is for: traversing each spatial sampling point under the control of a test computer, and returning an in-place confirmation signal to the multitask control device when each spatial sampling point is reached;
the multitask control device is used for: storing test task information, wherein the test task information comprises all test frequency information and transmit-receive beam pointing state information to be tested; responding the in-place confirmation signal in real time under the control of a test computer, and sequentially sending the test task information to the array surface control device;
the front surface control means is for: responding each state information to be tested sent by the multitask control module in real time, generating a corresponding state control instruction, controlling a comprehensive frequency source and the large-scale array antenna equipment to be tested to synchronously switch test frequency according to the corresponding state control instruction, and controlling the large-scale array antenna equipment to be tested to switch a receiving/transmitting beam pointing state;
the integrated frequency source is for: under the corresponding state control instruction, providing a synchronous clock and a local oscillator for the test system and the large-scale array antenna equipment to be tested;
the near field sampling probe is further operable to: when the emission characteristic of the large-scale array antenna equipment to be tested is tested, receiving a radio frequency test signal radiated by the large-scale array antenna equipment to be tested, and sending the radio frequency test signal to the monitoring T/R component of the large-scale array antenna equipment to be tested; when the receiving characteristic of the large-scale array antenna equipment to be tested is tested, receiving the radio frequency test signal output by the monitoring T/R component and radiating the radio frequency test signal to the large-scale array antenna equipment to be tested;
the large-scale array antenna equipment monitoring T/R component to be tested is used for: carrying out digital sampling on the radio frequency test signal to generate an IQ test digital signal; generating an IQ reference digital signal; sending the IQ test digital signal and the IQ reference digital signal to a test computer;
the test computer is used for: and carrying out normalization processing on the IQ test digital signal based on the IQ reference digital signal to form complete amplitude-phase distribution, and determining OTA performance index of the large-scale array antenna equipment to be tested through near-far field transformation. The test computer schedules and controls the whole test system, and realizes real-time synchronous control of probe mobile sampling, multi-task state switching, test data acquisition and test data processing analysis.
In the embodiment of the present invention, as shown in fig. 2, the large-scale array antenna device to be tested includes: a large-scale array antenna, a multi-channel T/R component, a (digital) monitoring T/R component and a DBF module;
the monitoring T/R component is used for: forming an IQ test digital signal after the radio frequency test signal is subjected to down-conversion and AD sampling; generating an IQ reference digital signal (specifically, generating a reference signal by a T/R component to perform self-closed loop acquisition to form an IQ reference digital signal);
the DBF (Digital Beam Forming) module is used for: and carrying out digital beam synthesis on the received data of each T/R channel based on preset digital domain amplitude-phase weighting to synthesize an IQ test digital signal.
The T/R component, i.e., the T/R (transmitter and receiver) component, generally means a portion between a digital baseband and an antenna in a wireless transceiver system, i.e., one end of the T/R component is connected to the antenna, and one end is connected to a baseband processing unit, thereby forming a wireless transceiver system.
In the embodiment of the present invention, as shown in fig. 3, the large-scale array antenna device to be tested further includes: and the comprehensive feed network (comprising a feed network and a local oscillator/clock network).
In the embodiment of the present invention, as shown in fig. 1, the method further includes: vector signal source: the Base Band Unit (BBU) is used for simulating the large-scale array antenna equipment to be tested and providing a base band digital signal for the large-scale array antenna equipment to be tested;
in the embodiment of the present invention, as shown in fig. 1, the method further includes: light amplifier-distributor (i.e. light amplifier/distributor): the system is used for completing the amplification, distribution and synthesis of the optical fiber control signal, the IQ test digital signal and/or the IQ reference digital signal of the large-scale array antenna equipment to be tested.
In the embodiment of the present invention, the method further includes: a turntable control device and a turntable; the large-scale array antenna equipment to be tested is placed on the rotary table;
the turntable control device is used for: and controlling the rotation of the turntable and the near field sampling probe, adjusting the posture of the large-scale array antenna equipment to be tested, and completing the three-dimensional space near field data sampling of the large-scale array antenna to be tested.
In the embodiment of the present invention, as shown in fig. 1, the method further includes: externally arranging a DBF device for testing;
the external DBF device for testing is used for: and carrying out digital beam synthesis on the received signals of all the T/R channels based on preset digital domain amplitude-phase weighting to synthesize an IQ test digital signal.
For some antenna devices with small scale or large-scale array antenna devices to be tested without DBF modules, the system provides an external DBF device for testing to complete the configuration and switching of the state of the beams to be tested, and the applicability of the testing system is expanded.
In the embodiment of the present invention, as shown in fig. 1, the method further includes: and the IQ data recorder is used for carrying out data acquisition and storage on the IQ test digital signal and the IQ reference digital signal.
The system also comprises a network switch, a multi-task control device, a front control device and a test computer, wherein the network switch is connected with the IQ data recorder and the multi-task control device.
Based on the same inventive concept, the embodiment of the present invention further provides an OTA testing method for 5G large-scale array antenna testing, as described in the following embodiments. Because the principle of solving the problems of the OTA test method for the 5G large-scale array antenna test is similar to that of the OTA test system for the 5G large-scale array antenna test, the implementation of the OTA test method for the 5G large-scale array antenna test can be referred to the implementation of the OTA test system for the 5G large-scale array antenna test, and repeated parts are not described again.
Fig. 4 is a flowchart of an OTA testing method for 5G large-scale array antenna testing according to an embodiment of the present invention, as shown in fig. 4, including:
s1: the near-field sampling probe traverses each space sampling point under the control of the test computer, and returns an in-place confirmation signal to the multitask control device when reaching one space sampling point;
s2: the multi-task control device stores test task information, wherein the test task information comprises all test frequency information and transmit-receive beam pointing state information which need to be tested; responding to the in-place confirmation signal under the control of a test computer, and sending the test task information to a front surface control device;
s3: the array surface control device responds to each piece of state information to be tested sent by the multitask control module in real time, generates a corresponding state control instruction, controls the comprehensive frequency source and the large-scale array antenna equipment to be tested to synchronously switch the test frequency according to the corresponding state control instruction, and controls the large-scale array antenna equipment to be tested to switch the beam receiving/transmitting pointing state;
s4: under the corresponding state control instruction, the comprehensive frequency source provides a synchronous clock and a local oscillator for the test system and the large-scale array antenna equipment to be tested;
s5: when the emission characteristic of the large-scale array antenna equipment to be tested is tested, the near-field sampling probe receives a radio frequency test signal radiated by the large-scale array antenna equipment to be tested and sends the radio frequency test signal to a monitoring T/R component of the large-scale array antenna equipment to be tested; when the receiving characteristic of the large-scale array antenna equipment to be tested is tested, receiving the radio frequency test signal output by the monitoring T/R component and radiating the radio frequency test signal to the large-scale array antenna equipment to be tested;
s6: the large-scale array antenna equipment to be tested digitally samples the radio frequency test signal to generate an IQ test digital signal; generating an IQ reference digital signal; sending the IQ test digital signal and the IQ reference digital signal to a test computer;
s7: the testing computer normalizes the IQ testing digital signal based on the IQ reference digital signal to form complete amplitude-phase distribution, and determines the OTA performance index of the large-scale array antenna equipment to be tested through near-far field transformation; the whole test system is controlled in a dispatching mode, and real-time synchronous control of probe moving sampling, multi-task state switching, test data acquisition and test data processing analysis is achieved.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium stores a computer program for executing the method.
In summary, the OTA testing system and method for 5G large-scale array antenna testing provided by the invention have the following beneficial effects:
(1) and (3) multi-task test system scheme design: different from the traditional OTA test scheme of the base station equipment, the test scheme provided by the invention can complete the OTA performance test (far field EIRP and receiving directional diagram) of the large-scale array antenna base station equipment to be tested in a state of multiple frequency points and multiple beams by single scanning, can greatly improve the test efficiency, and meets the engineering test requirement under the complex beam radiation scene in the 5G era;
(2) and (3) multi-task test system design: the multitask control device is the key of the test system with multitask test capability. Before the test starts, a test engineer needs to pre-store all test task information such as frequency points to be tested, the directions of the receiving and transmitting wave beams and the like in a multi-task control module, and after the test starts, the module responds to a probe position confirmation signal in real time and sequentially packages and sends all pre-stored test task information to a front surface control module;
(3) near-field synchronous phase-coherent scheme: for a large-scale array antenna system with a digital or digital-analog hybrid beam forming framework, the extraction of near-field amplitude phase information is completed based on a digital monitoring T/R component serving as a reference of synchronous phase-coherent. When the emission characteristic of the equipment to be tested is tested, a radio frequency signal received by the near-field sampling probe enters the monitoring T/R component to form an IQ test digital signal through down-conversion and AD sampling, and meanwhile, the monitoring T/R component generates a reference signal to carry out self-closed loop acquisition to form an IQ reference digital signal; when the receiving characteristic of the equipment to be tested is tested, an antenna DBF module synthesizes an IQ digital signal according to the preset digital domain amplitude-phase weighting, and simultaneously monitors a T/R component to generate a reference signal for carrying out self-closed loop acquisition to form an IQ reference digital signal;
(4) design of the DBF device for external test: for some large-scale array antennas to be tested with smaller antenna scale or without DBF module in the antenna array surface, the system provides an external DBF device for testing to complete the configuration and switching of the state of the wave beam to be tested and expand the applicability of the testing system.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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| CN114578142A (en) * | 2022-02-23 | 2022-06-03 | 北京理工大学 | Antenna measurement method, device, spherical surface measurement device and readable storage medium |
| CN115207629A (en) * | 2022-07-21 | 2022-10-18 | 中国信息通信研究院 | Amplitude and phase calibration method of 5G large-scale array antenna |
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| CN116068283A (en) * | 2022-09-06 | 2023-05-05 | 山东科技大学 | Far-field two-probe active antenna OTA test method |
| CN116388894A (en) * | 2023-06-06 | 2023-07-04 | 中国电子科技集团公司第五十四研究所 | Non-stationary orbit satellite emission EIRP value test method |
| WO2024045649A1 (en) * | 2022-08-31 | 2024-03-07 | 东南大学 | Near-field air interface rapid measurement system and method for pattern of active array antenna |
| WO2024125051A1 (en) * | 2022-12-16 | 2024-06-20 | 中兴通讯股份有限公司 | Base station testing apparatus |
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