129 results about "Antenna calibration" patented technology

The invention relates to the related technical field of antenna calibration, in particular to a phased-array antenna calibration method and system, and the method comprises the steps: building a three-dimensional near-field calibration reference, and simulating an initial error matrix; wave beam pointing deviation is determined through grouped excitation, and space angle error components are matched; generating a dynamic calibration weight matrix; and deploying distributed calibration nodes, and carrying out mutual coupling effect bias measurement and calibration decision. The technical problems that a static compensation coefficient is difficult to adapt to a dynamic working condition, thermal drift, mechanical deformation and electromagnetic interference cannot be effectively separated, and the stability of a communication link is influenced are solved, an initial error matrix is prepared by establishing a three-dimensional near-field calibration reference and combining phase difference and amplitude errors, collaborative optimization of grouped excitation and angle errors is carried out, and the stability of the communication link is improved. And in combination with the least square method and the deep separable convolutional neural network, environment disturbance is effectively separated and dynamically compensated, distributed calibration nodes are deployed, the mutual coupling calibration efficiency between array elements is improved, and the technical effect of influencing the stability of a communication link is further guaranteed.

The invention belongs to the technical field of microwave antennas, and discloses a quick amplitude-phase self-calibration device and method for an all-digital phased-array antenna. According to the invention, the satellite-borne baseband sends the self-calibration control instruction through the CPRI protocol, enters a transmitting channel amplitude-phase error self-calibration mode, enters a receiving channel amplitude-phase error self-calibration mode, and can realize on-orbit real-time channel amplitude-phase self-calibration of the full-digital phased-array antenna. The method is short in self-calibration period, does not depend on external instruments and equipment, and is particularly suitable for real-time calibration after long-term in-orbit operation of a satellite and change of the amplitude-phase characteristics of an antenna array plane channel; according to the antenna self-calibration method, a transmitting channel traversal form is adopted, and the expansion of the scale of the phased-array antenna does not need to increase hardware computing resources for antenna calibration; according to the invention, the time domain averaging and FFT dot frequency calculation methods are adopted to judge the antenna compensation data at the same time, so that external signal interference in the calibration process can be effectively avoided, and the amplitude-phase compensation precision is high.

Systems and methods are disclosed that relate to Key Performance Indicator (KPI)-driven alarm threshold optimization using machine learning. In one embodiment, a computer-implemented method comprises obtaining network-level KPI data for a network and radio log data for one or more radio systems in the network. The KPI data comprises KPI values for one or more network-level KPIs, and the radio log data comprises a number of faulty or uncalibrated antenna branches in the radio system and cell or user beamforming weights. The method further comprises pre-processing the KPI data and the radio log data, labeling the pre-processed KPI data as degraded or non-degraded, and training, with the labeled KPI data and the pre-processed radio log data, a fault classifier Machine Learning (ML) model to output a value(s) that represent a probability that the KPI(s) will be degraded for a given input feature set.

The invention discloses a calibration method for receiving a digital phased-array antenna, which comprises the following steps of: generating one path of signal as a reference signal by adopting a sampling DBF unit FPGA (Field Programmable Gate Array) itself, opening antenna array element channel signals in a beam pointing normal direction in a far-field test environment, and performing synchronous frequency mixing on each array element channel signal and the reference signal, and finally, the relative phase difference Phase of each antenna array element channel is obtained. According to the method, the complexity of the radio frequency assembly is reduced, and the product cost is reduced; regional calibration can be carried out on a large-scale receiving digital phased-array antenna, and the distance requirement of far-field calibration is reduced.

The invention relates to the technical field of antenna calibration, in particular to an automatic photoelectric marker calibration device and method based on space vector measurement, and the device comprises a tripod, an azimuth pitching two-dimensional precision turntable, a laser range finder, a monitoring camera and an upper computer. The azimuth pitching two-dimensional precision rotary table is fixedly installed on the tripod, the laser range finder is fixedly installed on the azimuth pitching two-dimensional precision rotary table, and the upper computer is electrically connected with the azimuth pitching two-dimensional precision rotary table, the laser range finder and the monitoring camera; the azimuth pitching two-dimensional precision turntable is a two-dimensional precision turntable driven by an ultrasonic motor; the laser range finder is a telescope type one-dimensional laser range finder; the monitoring camera is a rotatable pan-tilt camera; the upper computer is a computer; the problems of low efficiency and poor precision of large-spacing manual operation in the existing photoelectric mark calibration technology are solved.

The invention provides an SAR (synthetic aperture radar) satellite on-satellite real-time imaging processing load whole-satellite closed-loop test method, which comprises the following steps: generating orbit and attitude data by using a simulator, and determining observation time and observation wave position of an SAR load; an existing SAR image is used as a simulation scene target to generate a target backscattering coefficient; generating a radio frequency SAR echo signal by using the generated orbit, attitude and beam position and the generated target backscattering coefficient; the AD optimal level of echo sampling in an on-satellite SAR load receiver and the gain of an SAR central electronic equipment receiver are obtained; measuring antenna receiving gains of different wave positions from the antenna calibration network by using a vector network analyzer; measuring test cable loss from the antenna calibration network to the echo simulator; measuring echo power by using a high-speed oscilloscope according to the generated radio frequency SAR echo signals under different wave positions; calculating an MGC value set by the SAR load receiver corresponding to each echo; and connecting a test system, and carrying out real-time imaging processing, load imaging processing and image detection test.

The invention discloses a method for calculating a channel time delay compensation value of a large-aperture antenna adopting near-field coupling, and the method comprises the steps: setting a calibration antenna on a main reflection surface of each antenna in an antenna array, and building a downlink channel time delay test loop and an uplink channel time delay test loop of each antenna in the antenna array; obtaining a downlink loop time delay and an uplink loop time delay of each antenna in the antenna array according to the downlink channel time delay test loop and the uplink channel time delay test loop of each antenna in the antenna array; obtaining a channel time delay compensation value of each antenna in the antenna array according to the downlink loop time delay and the uplink loop time delay of each antenna in the antenna array; the channel time delay compensation value comprises relative downlink channel time delay and relative uplink channel time delay. According to the invention, a far-field calibration tower of an antenna array system does not need to be established, the signal delay requirement of the antenna calibration channel can be met, and the system design is simplified.

The invention relates to the field of antenna calibration, and discloses a phased-array antenna calibration method and device, computer equipment and a phased-array antenna, and the method comprises the steps: obtaining an array element clustering result associated with a to-be-calibrated phased-array antenna; dividing the phased-array antenna to be calibrated into a plurality of array element groups according to an array element clustering result; obtaining measurement data of each array element group; and calibrating the phased-array antenna to be calibrated according to the measurement data. Through a grouping calibration strategy, the calibration efficiency of the phased array antenna is greatly improved, and the method is particularly suitable for a phased array system in a large-scale, high-density and dynamic environment.

The utility model discloses a high-precision waveguide antenna calibration device which comprises an analyzer and a connecting element which are used in cooperation with each other. One side of the analyzer is connected with a containing bin in a sliding manner, and the containing bin is used for containing a connecting element; the connecting element comprises a plurality of waveguide wires matched with the analyzer, a plurality of calibration pieces matched with the waveguide wires, and an auxiliary connecting piece; the two ends of the waveguide wire are fixedly connected with a first connector corresponding to a wiring port of the analyzer and a second connector corresponding to the calibration piece respectively, and the calibration piece always tends to get close to the second connector through the auxiliary connecting piece. According to the utility model, the analyzer and the connecting element are placed together through the design of the accommodating bin, the probability that the connecting element is lost is reduced, meanwhile, the connecting element is also internally provided with the auxiliary connecting piece, the tightness and firmness of the connection between the calibration piece and the waveguide antenna are reinforced, the calibration accuracy of the analyzer through the calibration piece is ensured, and the calibration accuracy is improved. Therefore, the accuracy of antenna test calibration is ensured.

For example, a radar apparatus may include a mismatch calibrator configured to determine antenna mismatch calibration information to calibrate an antenna mismatch of a radar antenna array comprising a plurality of receive (Rx) antennas; and a processor to process radar Rx data, and to generate radar information based on the radar Rx data and the antenna mismatch calibration information, the radar Rx data is based on Rx radar signals received at the plurality of Rx antennas.

The present invention belongs to the technical field of antenna calibration, and relates to a calibration coupling network device for an array antenna, which includes a PCB board and multiple groups of radio frequency coupling modules. A main port and multiple pair ports are provided on the PCB board. The multiple pair ports are respectively connected to the multiple groups of radio frequency coupling modules. A connector is connected to the main port. A printed circuit is provided on the PCB board, and the printed circuit connects the main port and the multiple pair ports. A calibration cable is provided between the main port and the connector. The present invention has the advantages of being able to accurately and real-time monitor the amplitude and phase of each element unit and shielding the interference of external electromagnetic fields on the calibration coupling network.

The present disclosure provides an air interface antenna calibration threshold adjustment method, an electronic device, and a computer readable medium. The air interface antenna calibration threshold adjustment method comprises: on the basis of a first path determination rule, respectively determining each path of a cell within a threshold adjustment period to obtain a cell path determination result; and on the basis of the cell path determination result, adjusting an air interface antenna calibration threshold of the cell, so that air interface antenna calibration is performed on the basis of an adjusted air interface antenna calibration threshold.

An embodiment of the present application provides an antenna calibration method, device, apparatus, and storage medium. The method is applied to a terminal and includes: receiving a calibration resource set sent by a network device, where the calibration resource set is used to indicate configuration information associated with a calibration pilot signal; and receiving a downlink calibration pilot signal and / or transmitting an uplink calibration pilot signal based on the calibration resource set to assist the network device in completing an antenna calibration process. The embodiment of the present application provides a complete millimeter-wave antenna array calibration scheme, including determining a primary selection set of auxiliary calibration terminals, and the auxiliary calibration terminals and the beams used by them can be updated during the calibration process; for the calibration process, one or more calibration resource sets can be configured through messages such as RRC, different types of calibration pilot signals are supported, and DCI, MAC CE, etc. can be used as indication information to dynamically trigger the calibration process, improving the flexibility of antenna calibration.

The present application discloses a phased array antenna calibration method, device, electronic device, and readable storage medium. The method of the present application includes: dividing the phased array antenna into subarrays to obtain multiple subarrays; generating orthogonal coded signals for each subarray, controlling multiple antenna units of the multiple subarrays to radiate the corresponding orthogonal coded signals in a polling manner, and controlling the calibration antenna unit corresponding to each subarray to receive the orthogonal coded signals radiated by the subarray to obtain the corresponding spatially synthesized signal; obtaining a transmit beam response function between the orthogonal coded signal of each subarray and the amplitude and phase errors of the multiple antenna units in the subarray according to the beam synthesis method on the transmitting side of the phased array antenna; and obtaining the amplitude and phase errors corresponding to each antenna unit of each subarray according to the transmit beam response function and the corresponding spatially synthesized signal. The present application does not require complex testing environments and conditions, and calibration tests can be performed during normal use of the phased array, which is convenient and reliable.

1. A phased antenna array calibration station, comprising: an enclosure including: a rectangular first internal room including at least one exterior door, a power supply, a cooling unit, a control device configured to control power, cooling, and testing within the second internal room, and an antenna under test (AUT); and a rectangular second internal room including at least one interior door abutting the first internal room, an opening in one wall of the second internal room, radio frequency (RF) absorbing material covering all interior surfaces of the second internal room, and at least one movable electromagnetic interference (EMI) shield configured to form an EMI seal around the opening and active elements of the AUT aligned with the opening; and a support fixture configured to support the AUT and align the active elements of the AUT with the opening in the second internal room including a cooling and electronics unit (CEU) configured to cool the AUT and operate the AUT.

The application relates to an antenna calibration method and device, comprising the following steps: selecting qualified visible satellites from GNSS satellites based on carrier phase observations, calculating unit observation vectors of the visible satellites, and determining reference satellites of each epoch according to the unit observation vectors of all the visible satellites; constructing a set of triple difference phase center error measurements; constructing a spherical harmonic function fitting model according to the set of triple difference phase center error measurements, and obtaining a phase pattern of the antenna to be calibrated after solving. The application is suitable for large-scale calibration of low-cost antennas. The carrier phase ambiguity is eliminated, the complex ambiguity resolution and verification process is avoided, the complexity of the phase center error calibration is reduced, the influence of triple difference noise on the fitting accuracy of the phase pattern is reduced, and the accuracy of the antenna calibration result is improved. The application also relates to an equipment and a storage medium.

An antenna calibration system and method use a transmitter antenna array and a receiver antenna array. Calibration automatically initiates in response to a trigger condition. Each receiver antenna in the receiver antenna array receives frequency-modulated signals from the transmitter antenna array. Optionally, the transmitter antenna array transmits signals of increasing frequency ("up chirps") and / or signals of decreasing frequency ("down chirps"). The frequency-modulated signals are processed through matched filters to determine filter responses. The phase differences for each receiver antenna are calculated based on the filter responses. Calibration coefficients for each receiver antenna are generated based on the calculated phase differences. The phase of signals received from the receiver antennae are then adjusted using the respective calibration coefficients.

A method for calibrating an antenna array in a wireless network node (100) is disclosed, the wireless network node comprising a plurality of antenna branches (110), each of the plurality of antenna branches comprising a corresponding antenna element (130). The method comprises repeatedly transmitting (508) slices of a fountain-coded sequence to the corresponding antenna element via the plurality of antenna branches, and for each of the plurality of antenna branches, selecting (516) the transmitted slice as a feedback signal via a return path (214) and determining (520) a signal quality of the feedback signal until the signal quality of the feedback signal for each antenna branch is greater than a threshold level. The method further comprises performing (512) antenna calibration based on the feedback signal for each antenna branch. Related apparatus, computer programs, and computer program products are disclosed.

The application discloses a traffic monitoring antenna receiving channel phase and array error joint calibration method, comprising the following steps: S1) establishing a TCAS antenna array model; S2) establishing a TCAS antenna far-field antenna calibration model; S3) moving a radiation source to a preset mark position to emit a calibration signal, so that each receiving channel antenna of the TCAS receives the calibration signal; S4) repeating S3 until the radiation source traverses all preset mark positions; S5) performing FFT processing on the received signal after mixing to obtain a received signal spectrum; S6) searching for a spectrum peak of the received signal spectrum to calculate a phase difference between a reference channel and a channel to be calibrated; S7) using a least square method to solve a fixed phase difference and an installation error; and S8) compensating for the channel phase by using the solving result to complete the calibration. The application can comprehensively calibrate the influence of the channel fixed phase difference and the antenna array element position coordinate error, and further improves the accuracy of the antenna channel calibration.

Systems and methods for antenna calibration of transmit chains in a base station are described. In particular, the method includes determining, by a controller, that user data transmission is initiated in an operating phase of the base station. A need for calibration of a plurality of transmit chains in the base station is determined. In response to the determination, the method includes detecting an arrival of at least one of a guard period of a special time slot in a Time-Division Duplex (TDD) radio frame, and an Orthogonal Frequency-Division Multiplexing (OFDM) symbol allocated by one or more higher layers in a Frequency Division Duplex (FDD) radio frame. The method includes performing fine-tuned calibration of each of the plurality of transmit chains based on the detection.

The present invention belongs to the technical field of phased array radar, and specifically relates to a frequency synthesizer receiver based on automatic amplitude and phase calibration of phased array radar. The present invention specifically includes a calibration transceiver switch module, an antenna calibration network module, a calibration receiver module, and a sum-difference channel receiver module, and by establishing a calibration timing and a calibration signal, the amplitude and phase in the transmitting and receiving channels are compensated and automatically calibrated. The automatic amplitude and phase calibration method of the phased array radar described in the present invention generates a receiving phase correction excitation signal during the receiving phase correction period and processes the received signal, sends the transmitting excitation signal to the calibration network during the transmitting phase correction period, and receives and processes the calibration signal coupled by the waveguide power divider by the calibration receiver, thereby completing the automatic amplitude and phase calibration, and improving the detection accuracy and reliability of the phased array radar in the process of object detection.

A tomographic imaging system including an extended source antenna, which produces a wavefield scattered by the internal structure of an object. A processor recursively reconstructs the internal structure by processing a current image of the internal structure of the object with a neural network operator trained to synthesize measurements of a point-source antenna corresponding to a wavefield scattered by the current image of the internal structure of the object, processing the synthesized measurements of the point-source antenna with a calibration neural network to estimate measurements of the extended-source antenna, and updating the current image of the internal structure of the object based on a difference between the measurements of the extended-source antenna and the estimation of the measurements produced by the calibration neural network.

The present invention discloses a GNSS dual-antenna calibration method and system, wherein a GNSS dual-antenna calibration method includes: determining a coarsely calibrated installation deflection between the dual antenna and the longitudinal axis of the vehicle body through the difference between the track angle and the dual-antenna heading angle in the GNSS positioning data; compensating the dual-antenna heading angle using the coarsely calibrated installation deflection to obtain a compensated dual-antenna heading angle; and obtaining a precisely calibrated dual-antenna orientation through the heading angle of the vehicle body and the compensated dual-antenna heading angle. In an embodiment of the present application, a coarsely calibrated installation deflection is first obtained using the track angle and the dual-antenna heading angle, and the compensated dual-antenna heading angle is obtained using the coarsely calibrated installation deflection. The compensated dual-antenna heading angle is then used in subsequent calculations, and a more accurate precisely calibrated dual-antenna orientation can be obtained through the vehicle body heading angle and the compensated dual-antenna heading angle.

The present application relates to a kind of multi-channel radar system external calibration method, comprising the following steps: adapter tool is fixedly connected on the calibration surface of radar antenna, the plane position of radar antenna calibration surface and adapter tool calibration surface is measured by measuring instrument, the inherent relative position relationship of both is solved;Radar antenna and adapter tool are combined and loaded into cabin;The position of adapter tool calibration surface and external calibration source is measured respectively using measuring instrument, the relative position of both is solved, and external calibration source position is adjusted until external calibration source is located at the mechanical zero of antenna;The inter-channel phase difference under the external calibration and internal calibration of radar receiver is analyzed, and the insertion phase is solved.The present application realizes the measurable of antenna calibration surface by the conversion of adapter tool, thereby carries out external calibration to multi-channel radar system, and improves the measurement accuracy of radar system.

The application provides an antenna calibration method, a network side device, an apparatus and a storage medium. The method comprises the following steps: determining a channel error type according to a precoding matrix indicator set sent by a target terminal, wherein the channel error type comprises a wideband error and a narrowband error; and performing antenna calibration according to the channel error type. The application determines the channel error type according to the precoding matrix indicator set, and then performs antenna calibration according to the channel error type, thereby improving the accuracy of antenna calibration.

According to one example, a massive multiple-input multiple-output (mMIMO) system configured for beamforming control may include an open radio access network (O-RU) radio unit with a processing device configured to: compute one or more predictive channel estimates, beamforming estimates, or antenna calibrations; calculate, based on an objective function having one or more of the predictive channel estimate, beamforming estimate, or antenna calibration as inputs, a power level for a data stream connected to a transmit antenna path, selecting the power level for the data stream to facilitate equal power distribution over a plurality of transmit antenna paths; and set the power level for the data stream connected to the transmit antenna path.

The invention discloses a UWB positioning device based on a six-unit array antenna, and relates to the technical field of wireless positioning, the UWB positioning device comprises a lower base, an antenna calibration plate, six miniaturized omnidirectional antennas and an upper cover protective cover, the lower base is connected with a network power line; the lower base is internally provided with an MCU algorithm processing module, a UWB positioning chip module, a power supply module and a network communication module, according to the design, through innovative antenna layout, an optimized signal processing algorithm and a built-in antenna calibration board, the problems that in the prior art, the deployment cost of multiple base stations is high, the positioning precision of a single base station is low, and the anti-interference capability is weak are solved; the single-base-station high-precision two-dimensional or three-dimensional positioning method is suitable for indoor and outdoor high-precision positioning scenes, and has the advantages of high positioning precision, strong anti-interference capability, long coverage distance and the like.

The present application discloses an antenna calibration method and system for the field of communication technology. The system includes: a baseband processing unit, a radio frequency remote unit, an antenna array, and a coupling antenna; the antenna array is configured to send a radio frequency calibration signal sent by the baseband processing unit to a wireless network; or to receive a radio frequency calibration signal; the radio frequency remote unit is configured to provide multiple transmission channels; the multiple transmission channels correspond to the multiple transmission ports; the coupling antenna is configured to receive the radio frequency calibration signal sent by the baseband processing unit in the wireless network and transmit a coupling signal corresponding to the radio frequency calibration signal to the baseband processing unit; or to send the radio frequency calibration signal to the wireless network; the baseband processing unit is configured to calibrate multiple baseband signals to be transmitted corresponding to the multiple transmission channels based on the difference between the radio frequency calibration signal and the coupling signal.

The present invention discloses a broadband antenna calibration network based on a multi-layer coupling technology, comprising: a power splitting layer, including a 1-to-4 power splitting network in a strip structure, and the 1-to-4 power splitting network includes three two-stage Wilkinson power splitters; a coupling layer, including 16 groups of coupling slots, and each group of coupling slots is composed of a first coupling slot, two second coupling slots and two third coupling slots; a feeder layer, including two groups of feeders symmetric about the center, and each group of feeders includes 8 bent transmission channels. In the present invention, the power splitting layer adopts a 1-to-4 power splitting network composed of broadband two-stage Wilkinson power splitters, which has good power distribution effect and high isolation; in addition, the coupling layer adopts a multi-slot form, which can achieve a weakly coupled characteristic that is flat and adjustable within a broadband. The present invention can be widely applied to the field of phased array antenna calibration technology.