51 results about "Antenna calibration" patented technology

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 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.

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.

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.

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.

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 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.

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 present application relates to the technical field of array antenna calibration information processing, and provides an array antenna calibration information processing method and system based on a navigation signal, which comprises the following steps: based on platform motion information and environmental geometry information, a signal feature dictionary is constructed by real-time identification of the direct path feature and the reflected path feature of the digitized navigation signal; based on the signal feature dictionary, the direct signal component and the reflected signal component are identified; when the quality of the direct signal component meets a preset condition, the inter-channel phase difference is extracted from the direct signal component; when the quality of the direct signal component does not meet the preset condition, the reflected signal component is compensated to construct a reference signal, and the inter-channel phase difference is extracted again; based on the inter-channel phase difference, the amplitude and phase calibration parameters of each channel of the array antenna are solved, and the amplitude and phase calibration parameters are applied to the antenna control loop. The present application has the effect of improving the accuracy of array antenna calibration information processing.

The present disclosure provides a method (400) for facilitating Antenna Calibration, AC. The method (400) includes: identifying (410) a leakage signal from a signal received at an AC signal receiver and resulted from a reference signal originated from an AC signal transmitter passing through an AC signal path from the AC signal transmitter to the AC signal receiver; and cancelling (420) an influence of the leakage signal on an AC process.

The application is suitable for the technical field of phased array antenna calibration, and provides a phased array antenna calibration method, device, medium and antenna system.The method comprises the following steps: acquiring network level information of a phased array antenna; acquiring amplitude ratio of field strength amplitude of each antenna unit relative to field strength amplitude of a reference array field, phase difference value; acquiring a to-be-calibrated signal port and the like; and finally obtaining phase and amplitude adjustment amount of the to-be-calibrated signal port.The application has the advantages that the array overall amplitude consistency can be effectively optimized, the array overall amplitude consistency is improved, the array synthesized field quality is improved, the influence of single antenna unit measurement error or local anomaly on the overall calibration result is effectively reduced, and the stability of the calibration result is improved.

The present application belongs to the technical field of calibration of phased array radar, and relates to a two-stage grouping asynchronous rotating electric vector radar array antenna calibration method, and the specific process is as follows: an attenuator and a phase shifter are configured to each element channel of the array antenna to be measured, and signals received by all channels are synthesized through a power divider; the phased array radar to be measured is equally grouped by channel number in a first stage; a grouping matrix is constructed based on a Hadamard matrix, and the channels grouped in the first stage are divided into rotating groups and fixed groups according to elements in the grouping matrix; a phase shift matrix for phase shift measurement of each row in different grouping matrices is constructed based on a discrete Fourier transform matrix with an order of N, and phase shift is performed; linear equations are constructed according to measurement results and solved, and the ambiguity coefficient, the amplitude of each channel and the phase difference between each channel are obtained, and each field normalization amplitude and phase is solved; amplitude and phase compensation of the channels is completed based on each field normalization amplitude and phase, and finally the amplitude and phase of all channels are consistent.

This invention discloses a calibration method, calibration system, equipment, and medium for phased array antenna channels, comprising: when the distance between the phased array antenna and the horn antenna meets the far-field condition, activating at least one transmit channel of the phased array antenna to transmit a first beam signal to the horn antenna, and deactivating other transmit channels; calculating multiple transmit calibration parameters based on the first beam signal received by the horn antenna; calibrating the corresponding transmit channels based on the multiple transmit calibration parameters; after all transmit channels of the phased array antenna have been calibrated, activating at least one receive channel of the phased array antenna to receive a second beam signal transmitted by the horn antenna, and deactivating other receive channels; calculating multiple receive calibration parameters based on the second beam signal received by the phased array antenna; and calibrating the corresponding receive channels based on the multiple receive calibration parameters. This invention improves the efficiency and accuracy of phased array antenna calibration and reduces calibration costs.

The application discloses a phased array antenna calibration method, a control device and an antenna calibration system, and relates to the technical field of phased array antenna calibration. The phased array antenna comprises a plurality of antenna units. The method comprises the following steps: acquiring first signal transmission parameters of a fixed probe relative to each antenna unit in a to-be-tested phased array antenna which is not provided with a radio frequency link gain component; acquiring second signal transmission parameters of the fixed probe relative to each antenna unit in the to-be-tested phased array antenna which is provided with the radio frequency link gain component; confirming gain parameters of the radio frequency link gain component corresponding to each antenna unit based on the ratio of the second signal transmission parameters to the first signal transmission parameters; and confirming calibration parameters of each antenna unit in the to-be-tested phased array antenna based on the gain parameters corresponding to each antenna unit and preset gain parameters corresponding to each antenna unit. The application aims to simplify the confirmation method of the radio frequency link gain of the phased array antenna, so as to improve the efficiency of phased array antenna calibration.

Certain aspects of the present disclosure provide techniques for wireless communications. A method for wireless communications by a user equipment (UE) includes sending, via a plurality of antenna ports, one or more sounding reference signals (SRSs) via one or more SRS ports; obtaining, via the plurality of antenna ports, one or more downlink reference signals (DL-RSs) corresponding to one or more DL-RS ports; and communicating, via the plurality of antenna ports, according to a respective inter-antenna phase offset for each of the plurality of antenna ports, wherein the respective inter-antenna phase offset for each of the plurality of antenna ports is based on a same receive-to-transmit phase offset for the plurality of antenna ports, the same receive-to-transmit phase offset for the plurality of antenna ports based on at least the one or more DL-RSs.

The described techniques provide for a user equipment (UE) to transmit maximum ratio transmission (MRT) precoded sounding reference signals (SRSs), where the SRSs may be precoded according to a phase of a downlink reference signal received at each antenna port of the UE. The UE may precode a first SRS for transmission by a first antenna port according to a first phase of the downlink reference signal at a first antenna port and may generate a second SRS for transmission by the second antenna port that is MRT-precoded according to a second phase of the downlink reference signal at a second antenna port. The UE may transmit the first SRS and the second SRS, and the network entity may calculate one or more inter-UE antenna offset values according to the received SRSs.

The invention relates to an amplitude-phase coupling type antenna array initial excitation estimation method based on amplitude measurement, and belongs to the technical field of antenna calibration. According to the method, a precise signal model containing amplitude-phase coupling characteristics is established, and a corresponding optimization solution strategy is designed, so that high-precision estimation of the initial excitation of the array unit can be realized without phase information. The initial excitation estimation method only based on amplitude measurement is suitable for an antenna array system with amplitude-phase coupling characteristics, and the initial excitation estimation of the antenna array element can be realized without obtaining phase information.

Embodiments of the present disclosure provide method and apparatus for antenna calibration. A method implemented at a first network device. The method includes receiving a first radio signal generated by the first network device via a receiver connected to an antenna of the first network device. The method further includes receiving at least one second radio signal from at least one second network device via the antenna of the first network device. The method further includes determining an impairment related to the antenna of the first network device based on the received first radio signal and the at least one second radio signal. There is a line of sight (LOS) path between the antenna of the first network device and the antenna of each of the at least one second network device.

The application discloses a low-orbit satellite phased array antenna calibration device, wherein the calibration antenna is connected with a transmitting calibration component and a receiving calibration component through a duplexer; a first calibration integrated circuit is connected with a first test circuit in series through a power divider and the calibration antenna to form a closed loop, and the first calibration integrated circuit is connected with a first reference circuit in series through the power divider to form a closed loop; the first calibration integrated circuit is used for calculating compensation amplitude and phase values according to comparison of amplitudes and phases between the first test circuit and the first reference circuit; a second calibration integrated circuit is connected with a second test circuit in series through a power divider and the calibration antenna to form a closed loop, and the first calibration integrated circuit is connected with a second reference circuit in series through the power divider to form a closed loop; and the second calibration integrated circuit is used for calculating compensation amplitude and phase values according to comparison of amplitudes and phases between the second test circuit and the second reference circuit.

Examples disclosed herein relate to an antenna calibration method for a beam steering radar. A first set of input voltages is determined for a plurality of phase shifters coupled to a plurality of antenna elements in an antenna array in the beam steering radar, the voltages to control phases of signals for transmission by the antenna array. A first set of input voltages is applied to the antenna array. Radiating signals resulting from the first set of input voltages are measured. Voltage and phase values for the plurality of phase shifters are iteratively optimized to determine voltage and phase value pairs that result in a desired gain for the antenna array. The voltage and phase value pairs are stored in a look-up-table in the beam steering radar.

The invention discloses a UWB antenna calibration device and method. The device comprises an actual installation platform used for installing UWB anchor points and an annular track. An actual installation platform computer is installed on the actual installation platform, and the UWB anchor points are in communication connection with the actual installation platform computer; a mobile platform carrying a UWB tag is arranged on the mobile track, a mobile platform computer and a navigation unit used for acquiring the position of the mobile platform are installed on the mobile platform, the navigation unit and the UWB tag are in communication connection with the mobile platform computer, and the mobile platform computer is in communication connection with the actual installation platform computer. The UWB anchor point network is deployed in an actual application scene, the UWB tag and the navigation unit are integrated by adopting the track-type mobile platform, the mobile platform can move according to a preset track and acquire related parameters in the movement process to complete calibration data acquisition and analysis operation to obtain calibration parameters, the operation logic is close to the actual application scene, and the calibration accuracy is improved. Cost is low, operation is convenient, and application prospects are good.

The invention relates to the technical field of phased-array antenna calibration, in particular to a parallel calibration method based on a multi-unit dual-circular-polarization phased-array spherical antenna, which comprises the following steps of: fusing a calibration clamp and a direct coupling coefficient matrix of array elements and a mutual coupling coefficient matrix among the array elements to obtain a three-dimensional coupling matrix; constructing a full-link signal model to synchronously acquire multiple paths of dual-polarization signals; any array element is selected as a reference array element, and initial calibration is carried out; performing channel separation on the dual-polarization signal, eliminating mutual coupling interference, and using the dual-polarization signal as a correction signal for calculating calibration parameters of all array elements relative to the reference array element; and when the phased array spherical antenna carries out beam forming, carrying out real-time calibration on the multiple paths of dual-polarized signals by using the calibration parameters. According to the invention, the amplitude and phase consistency between large-scale receiving channels is improved, and a reliable calibration foundation is laid for a high-performance multi-beam phased array system.

This application provides a calibration method, apparatus, storage medium, and calibration device for radar angle measurement. The radar includes a radar body and a cover. The radar body includes a receiving antenna. The calibration method includes: acquiring a first phase change, which is determined based on the distance between different receiving antennas; acquiring a second phase change, which includes the phase change caused by the radar body's influence on the reflected wave and the phase change caused by the cover's influence on the reflected wave; calculating the sum of the first and second phase changes to obtain a phase calibration value in the echo direction; and calibrating the phases to be calibrated measured in multiple echo directions based on the phase calibration value to obtain multiple calibration data. This application solves the problem that traditional radar angle measurement calibration methods do not consider the influence of the radar cover on the angle measurement accuracy by calibrating the radar body and the cover as a whole.

This application discloses an antenna calibration method, apparatus, electronic device, and readable storage medium, belonging to the field of communication technology. The method includes: selecting multiple sets of candidate calibration weights from a set of calibration weights; sending channel state information measurement reference signals (CSI-RS) corresponding to each set of candidate calibration weights to a target terminal; determining a target calibration weight from the multiple sets of candidate calibration weights based on CSI-RS resource indication information fed back by the target terminal; and calibrating the antenna array according to the target calibration weight.

This application discloses a calibration device and method for an active rod antenna, relating to the field of antenna calibration. The device includes a metal shielding housing and a resistive T-network module and a capacitor integrated within the metal shielding housing. The resistive T-network module simulates the input impedance of the active rod antenna, and the capacitor simulates the distributed capacitance. When the input RF interface is connected to a standard signal source, the output RF interface is connected to a spectrum analyzer, and the ground terminal is connected to the active antenna host, the antenna factor of the active rod antenna is calculated by measuring the first signal strength at the output RF interface and the second signal strength at the output port of the active antenna host, thus completing the calibration. This application enables portable, accurate, and efficient calibration of active rod antennas.

An antenna calibration method, system, and apparatus are disclosed. In the method, at least one first metasurface element is located along the path of a signal transmitted by the first antenna element. A control module acquires first error information indicating parameter errors in the signal transmitted by the first antenna element. Based on the first error information, the electromagnetic response of at least one first metasurface element is adjusted to calibrate the parameters of the signal transmitted by the first antenna element. Thus, a mechanism for calibrating the parameters of the signal transmitted by the first antenna element is provided, which can improve antenna calibration performance.

The present application provides an antenna calibration method and apparatus, and a remote radio unit. The method includes: generating a calibration sequence of a channel to be calibrated; determining, according to obtained calibration configuration information of the channel to be calibrated and an output sequence of the channel to be calibrated, a calibration response sequence of the channel to be calibrated; and calibrating the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated.

The described technology is generally directed towards scheduling, by a distributed unit, the injection of custom traffic (signals / data) into a radio unit communications path. The custom traffic can be used to improve the performance of the radio unit, such as to perform antenna calibration, to perform test and measurement operations to obtain performance data, which can be used, for example, to modify operating parameters of the radio unit to improve performance of the radio unit. The distributed unit coordinates with the radio unit to schedule and synchronize such custom traffic in unscheduled (physical resource block), such as interleaved with to live-air and non-live-air traffic. Further, the distributed unit, which has scheduling knowledge of upcoming traffic of the radio unit, can communicate such knowledge to the radio unit for the radio unit to change its operating state based on the upcoming traffic knowledge.

The application provides an antenna calibration method, device, storage medium and electronic equipment. The antenna calibration method comprises the following steps: determining a target calibration frequency band according to the frequency bands of multiple calibration signals transmitted by a same radio frequency channel, the target calibration frequency band intersecting with the frequency bands of other calibration signals; acquiring a current frequency band of a current calibration signal when the current calibration signal is transmitted by the radio frequency channel; performing a calibration operation on the current calibration signal and outputting a first calibration result when the current frequency band is the target calibration frequency band; and stopping the calibration operation on the current calibration signal and directly outputting the first calibration result when the current frequency band is not the target calibration frequency band. Thus, the antenna calibration method can ensure the accuracy of calibration and improve the calibration efficiency.

Embodiments of this disclosure provide methods and apparatus for antenna calibration. One method, implemented at a network function, includes calibrating an antenna for the network function based on available time-frequency resources. The method also includes communicating with at least one terminal device via the calibrated antenna.