45 results about "Reference antenna" patented technology

The invention discloses a phase-free antenna measurement method, a phase-free antenna measurement system and a storage medium. The phase-free antenna measurement method comprises the following steps: constructing a measurement system comprising an antenna to be measured, a measurement probe, a fixed auxiliary reference antenna and software defined radio; the probe is controlled to move and sample on the scanning plane, and the SDR synchronously collects receiving signals of the probe and the reference antenna; based on the frequency domain transformation result of the two paths of signals, the radiation field amplitude of each sampling point and the relative phase relative to the reference antenna are directly calculated through non-iterative operation, so that complete complex electric field distribution on the scanning plane is reconstructed; and finally, obtaining a far-field directional diagram through near-field-far-field transformation. The fixed reference antenna is introduced to serve as a phase reference, synchronous acquisition and direct calculation are achieved in combination with the SDR, the antenna radiation field can be rapidly and accurately recovered without direct phase measurement or complex iteration in the single scanning plane and single scanning process, and the method has the advantages of being simple in system, high in measurement efficiency and high in signal drift resistance.

Apparatuses and methods for calibration reporting. A method performed by a UE includes receiving information about a CSI report. The information indicates NTRP>1 downlink reference signals (DL RSs), an associated sounding reference signal (SRS) resource in an SRS resource set from Nset≥1 SRS resource sets, and PSRS≥1 reference antenna ports from x SRS ports of the associated SRS resource. The method further includes transmitting, based on the information, the associated SRS using the PSRS reference antenna ports, receiving, based on the information, the NTRP DL RSs using the PSRS reference antenna ports for calibration-related measurement, determining, based on the information and the calibration-related measurement, calibration-related information (CLI), and transmitting the CSI report including the CLI.

Apparatuses and methods for channel state information (CSI) reporting in multi-transmission reception point (TRP) operations in wireless networks. A method performed by a user equipment (UE) includes receiving information about a CSI report associated with Ntrp groups of antenna ports, where Ntrp>1 and, based on the information, determining the CSI report associated with N≤Ntrp groups of antenna ports, where N∈{2, 3, . . . , Ntrp}. The CSI report includes a first indicator indicating, for each layer l=1, . . . , v, indices of Mv vectors including columns of a frequency-domain (FD) basis matrix Wf,l, where v≥1 is a rank value and a second indicator indicating an index of a FD offset value φr for each of the N groups of antenna ports, where r∈{1, . . . , N}, r≠r* and r* is an index of a reference group of antenna ports. The method further includes transmitting the CSI report including the first and the second indicators.

The invention discloses a method for calibrating an antenna array downlink by using a plurality of satellites, and the method comprises the steps: receiving a beacon signal transmitted by each satellite in a time-sharing manner through each antenna in an antenna array, and calculating a relative signal phase difference caused by the difference of the downlink of an antenna to be calibrated relative to a reference antenna; the relative signal phase difference caused by the difference of the downlink of the antenna to be calibrated relative to the reference antenna is obtained; fitting a linear equation through a least square method according to a relative signal phase difference brought by a difference between each antenna to be calibrated in an antenna array corresponding to a plurality of on-orbit satellites and a downlink of a reference antenna; and obtaining the relative delay inequality of each to-be-calibrated antenna in the antenna array relative to the reference antenna after downlink calibration and the relative phase difference of each to-be-calibrated antenna after downlink calibration. The method is simple, reliable and convenient to implement.

The invention relates to a GNSS array antenna-based phase multi-path real-time correction method and system. The method comprises the following steps of: constructing a spatial correlation array antenna system; based on an array antenna system, calculating geometric position relations of other antenna units relative to a reference antenna unit, forming single-difference carrier phase residual observation values of different antenna units and the reference antenna unit, and constructing a carrier phase multipath error parameter estimation model; based on a carrier phase multi-path error parameter estimation model, jointly processing a multi-frequency GNSS observation value by using the consistency and frequency correlation of propagation paths of frequency points of a multi-frequency GNSS signal, and establishing a multi-frequency multi-path error redundancy estimation model; based on the multi-frequency multi-path error redundancy estimation model and particle filtering, performing nonlinear estimation on parameters of the carrier phase multi-path error parameter estimation model to obtain multi-path error parameters; and obtaining a carrier phase multipath error value of each frequency point by using the multipath error parameter, and correcting the error value in real time in GNSS positioning calculation.

The invention provides an air interface wire rapid calibration method and system, and solves the problems of high execution complexity and difficulty in engineering application caused by the adoption of space violent search in the existing air interface wire calibration technology. The method comprises the following steps: synchronously starting a static calibration antenna and a reference antenna fixedly connected with a rotary table under a plurality of rotation angles of the rotary table, and acquiring measurement data from measured equipment; determining a phase difference data set and a relative amplitude data set according to the measurement data; reconstructing a plurality of air interface transmission matrixes in a digital domain based on the data set, and screening out at least one calibration antenna spatial position combination by taking a matrix condition number as an index; and air interface wire calibration is completed according to the combination. According to the invention, the calibration complexity is reduced from a combination order to a linear order, the hardware cost and the measurement time are significantly reduced, the high-efficiency and high-precision calibration of large-scale terminals such as a whole vehicle is realized, and the method has wide applicability irrelevant to frequency.

The invention discloses a photoelectric sensor system conversion efficiency calibration system and method based on a reverberation chamber, and belongs to the technical field of photoelectric sensor conversion efficiency calibration, the system comprises an electric wave reverberation chamber, a transmitting antenna, a reference antenna and a photoelectric field sensor system; the photoelectric field sensor system is composed of a photoelectric sensor, a laser source, a photoelectric detector, a polarization maintaining optical fiber and a single-mode optical fiber. In the calibration process, the reference antenna and the photoelectric sensor system are used as receiving ends respectively, receiving power at different stirring positions in the reverberation chamber is sampled to obtain two groups of transfer functions, and the total efficiency of the photoelectric sensor system is determined by comparing the two groups of transfer functions under the condition that the radiation efficiency of the reference antenna is known. The conversion efficiency of the photoelectric sensor system is obtained by combining the relation among the power, the field intensity and the total efficiency in the free space; and the effective averaging of the incident direction and the polarization state is realized by using the uniform and isotropic electromagnetic field characteristics of the reverberation chamber.

There is provided a first device comprising means for: transmitting, to a second device, information indicative of a geometry of a plurality of non-planar antennas of the first device; determining at least two reference antennas of the plurality of non-planar antennas based on information indicating a geometry of the plurality of non-planar antennas; and transmitting the reference signal to the second device via the determined at least two reference antennas without transmitting the reference signal via the remainder of the plurality of non-planar antennas.

The present application relates to a kind of separation identification and monitoring method and system of radiation background noise, in separation identification and monitoring method, background noise and equipment emission signal are synchronously collected by multiple fixed reference antennas and main antenna, and time synchronization is realized by central synchronous unit.First, based on spectrum comparison, background noise probability is calculated, and first grade is filtered out;Second, baseline model is established according to reference antenna data, abnormal signal is identified and its source is judged, and burst background noise and equipment real emission are distinguished;Second grade is filtered out by using pre-stored feature library for matching identification;Finally, the comparison result of real emission signal and background noise after filtering is displayed on test interface, and the data exceeding the standard is automatically marked, test margin is calculated and conclusion is generated.Compared with prior art, the present application can effectively solve the technical problem that background noise and equipment signal are difficult to separate in real time and accurately in complex electromagnetic environment, and the reliability and efficiency of radiation test are significantly improved.

The invention discloses an antenna simulation efficiency compensation design method and device, equipment and a storage medium, and relates to the technical field of simulation testing. The method comprises the following steps: acquiring a theoretical difference value between simulation efficiency of a standard reference antenna constructed by an antenna to be designed in simulation software and a microwave anechoic chamber; according to the radio frequency matching circuit structure of the antenna to be designed and the coaxial line parameters, theoretical loss parameters are obtained through calculation; constructing a simulation model of a to-be-designed antenna, and obtaining theoretical radiation efficiency according to the simulation model; and calculating the antenna simulation radiation efficiency according to the obtained theoretical difference value, the theoretical loss parameter and the theoretical radiation efficiency. Theoretical calculation and compensation are carried out on variables related to simulation and real objects, the difference between simulation efficiency and actual efficiency is made up, and more accurate antenna performance evaluation is achieved.

The invention relates to an electromagnetic logging technology, and discloses a while-drilling forward focusing electromagnetic logging method, which comprises the following two stages: (1) a pre-testing stage: a magnetic ring antenna array linearly arranged along a drill collar is utilized, an antenna at the rearmost end is used as a reference antenna to transmit a signal, and a front preorder antenna simultaneously receives the signal, and the amplitude and the phase delay of the received signal of each preorder antenna are synchronously obtained. (2) forward focusing stage: configuring transmitting parameters for the preorder antennas, setting the initial phase of each preorder antenna as a negative value of measured phase delay, and calculating an inversely proportional weight coefficient according to the receiving amplitude so as to configure the driving amplitude of each preorder antenna; and finally, driving the reference antenna and the configured preorder antenna to synchronously transmit, performing coherent superposition in front of the drill bit to form a focused wave beam, and weakening signal interference of lateral and backward stratums of the instrument at the same time. Equipment does not need to be preset in an undrilled stratum, the method is completely compatible with an existing instrument, and the signal strength and the signal-to-noise ratio of forward detection can be remarkably improved.

The application discloses a dynamic hybrid beam tracking system for satellite communication. The system divides the beam tracking into three operation modes according to the current reference antenna steering in the memory, the antenna steering updated by the mechanical three-axis transmission shaft, the satellite incoming path direction relative to the antenna main shaft direction of the user terminal, the received signal strength indicator and the predefined antenna field of view. The three operation modes include: the first mode, using coarse beams to realize large range tracking at a low sampling rate; the second mode, using fine beams to realize medium range tracking at the same low sampling rate; and the third mode, using fine beams to realize small range tracking at a high sampling rate. The system can realize accurate and adaptive beam alignment to improve the satellite communication efficiency.

This invention relates to electromagnetic logging technology and discloses a forward-focusing electromagnetic logging method while drilling, comprising two stages: (1) Pre-testing stage: using a magnetic ring antenna array arranged in a straight line along the drill collar, the last antenna is used as a reference antenna to transmit signals, and the preceding antennas simultaneously receive them, so as to synchronously acquire the amplitude and phase delay of the received signals of each preceding antenna. (2) Forward focusing stage: configuring the transmission parameters for the preceding antennas, setting their initial phase to the negative value of the measured phase delay, and calculating an inversely proportional weighting coefficient based on the received amplitude, thereby configuring the driving amplitude of each preceding antenna; finally, driving the reference antenna and the configured preceding antennas to transmit synchronously, and coherently superimposing them in front of the drill bit to form a focused beam, while weakening the signal interference from the instrument's sides and back to the formation. This invention does not require pre-setting equipment in un-drilled formations, is fully compatible with existing instruments, and can significantly improve the signal strength and signal-to-noise ratio of forward detection.

The invention discloses an accurate attitude determination method and system based on GNSS multi-antenna multi-frequency ambiguity step-by-step solution, and the method comprises the steps: firstly calculating the coordinates of a reference antenna in an ECEF coordinate system through employing a reference antenna observation value, and then calculating a rotation matrix from the ECEF coordinate system to a navigation coordinate system at the reference antenna; constructing a double-difference pseudo-range and carrier phase observation equation between the reference antenna and each auxiliary antenna on the carrier according to GNSS multi-antenna multi-frequency observation data, constructing a wide-lane carrier phase observation equation according to the double-difference pseudo-range and carrier phase observation equation, and obtaining double-difference wide-lane ambiguity of each baseline; according to the GNSS multi-antenna multi-frequency attitude determination method, the function of performing high-precision attitude determination according to step-by-step calculation according to the GNSS multi-antenna multi-frequency ambiguity and by adopting a mode of combining a direct method and a least square method is realized, and the GNSS multi-frequency attitude determination calculation efficiency is improved by utilizing the advantage that the ambiguity of the multi-frequency combination observation value is easy to fix, so that the GNSS multi-frequency observation value is reasonably utilized, and the GNSS multi-antenna multi-frequency attitude determination accuracy is improved. And the attitude calculation precision is also improved.

Method for determining the antenna gain of an antenna (21) to be tested in free space, wherein the method comprises the following steps: Acquisition of measurement results of a transmitted power of a measurement signal (24a, 24b) transmitted between a reference antenna (22) and an antenna to be tested (21); Determining an input reflection factor ( P e _ TP e _ R ) | P g _ R = 0 the antenna (21) to be tested and an input reflection factor ( P g _ TP g _ R ) | P e _ R = 0 the reference antenna (22); Detecting polarization losses based on an angle between the unit vector of the electric field vector (p̂) T ) the antenna (21) to be tested and the electric field vector (p̂ R ) the reference antenna (22); where the detection takes place in the frequency domain; Converting the recorded measurement results into the time domain; Applying a time domain filter (26) to the measurement results converted into the time domain, wherein a filter width of the time domain filter (26) is determined as a function of a spatial distance (r) between the reference antenna (22) and the antenna (21) to be tested, so that measurement result components (24b) resulting from multipath propagation of the measurement signal (24a, 24b) between the reference antenna (22) and the antenna (21) to be tested are reduced or removed; Converting the filtered measurement results into the frequency domain; and Determining the antenna gain G T (ϑ, φ) of the antenna (21) to be tested, taking into account the recorded input reflection factors and polarization losses, based on the filtered measurement results available in the frequency domain using the following equation: GT ( ϑ , ϕ ) = 10 log 10 ( P _ TP g _ R ) − 20 log 10 ( λ 4 π r ) − GREF ( ϑ , φ ) − ( 10 log ( 1 − ( P _ TP g _ R ) | P g _ R = 0 ) + 10 log ( 1 − ( P g _ TP g _ R ) |. P _ R = 0 ) + 20 log |

An arrangement for determining a characteristic of a plurality of antennas, the arrangement comprising: a plurality of field probes, each field probe having a transmitter for sending information about an amplitude of an electric field existing at the respective field probe; a test antenna; a reference antenna with a predetermined radiation pattern; at least one signal source connected to the test antenna and the reference antenna and configured to supply mutually coherent signals to the test antenna and the reference antenna; a device for determining phase information of the electric field existing at the respective field probe by means of interference of a first signal emitted by the test antenna with a second signal emitted by the reference antenna having the same frequency as the first signal;and a phase shifter designed to shift the phase of the emitted second signal, thereby changing the interference pattern.

This disclosure provides an antenna testing system and method, relating to the field of antenna technology. The testing system includes a voltage loading device, the output of which is connected to the input of a phased array antenna; a field testing system for testing the antenna parameters of the phased array antenna; and a computer device, the output of which is connected to the voltage loading device, and the input of which is connected to the field testing system. In real-time mode, this disclosure allows for the pre-testing of the target loading voltage corresponding to the phased array antenna when its performance most closely approximates the reference antenna parameters during beam radiation. Since the tested target loading voltage is obtained through actual testing using the field testing system, the accuracy of the tested target loading voltage is guaranteed, thus ensuring the antenna performance of the phased array antenna in subsequent use.

The invention relates to the technical field of wireless sensing, and discloses an RFID (Radio Frequency Identification Device) pose estimation non-line-of-sight shielding influence suppression method based on antenna weight, which comprises the following steps of: S1, constructing a relation model of a label position and a non-line-of-sight shielding error; s2, distributing antenna weights according to the theoretical phase difference and the actual phase difference between each antenna and the reference antenna; s3, constructing an augmented Lagrangian convex optimization algorithm according to the relation model in the S1 and the antenna weight in the S2, and finally obtaining label position information by continuously iteratively inhibiting the influence of non-line-of-sight shielding; and S4, in combination with an antenna weight and a multi-signal classification algorithm, label attitude information is obtained through peak detection. By constructing a relation model of a label position and a non-line-of-sight occlusion error, the error size is quantified instead of being simply regarded as environmental noise; in addition, through an adaptive antenna weight distribution mechanism based on phase residual statistical analysis, the shielding condition of the antenna is automatically identified, and the corresponding weight is reduced.

The application relates to the technical field of communication, and particularly discloses a kind of angle of arrival measurement method and system suitable for low-cost receiver, the low-cost receiver has multiple radio frequency front ends and its shared analog-to-digital converter (ADC) and digital signal processor, wherein each radio frequency front end is connected with a corresponding antenna, the method comprises the following steps: receiving the signal of remote device through n antennas simultaneously, obtaining a reference antenna;Obtain the mixed signal of the jth antenna and the reference antenna, determine the phase of the mixed signal;Calculate the phase difference between the signal received by the reference antenna and the signal received by the jth antenna, generate a phase difference set;Determine the angle of arrival (AOA) of the signal sent by the remote device based on the phase difference set and the distance information between the n antennas.The application realizes low-power and low-cost AOA measurement, and reduces the cost of positioning.

The present application relates to the technical field of communications, and provides a communication method, an apparatus and a system. The method comprises: a terminal sends on a first resource a first reference signal, the first resource comprising a first port, the first port being associated with a first antenna port, and the first reference signal being used to estimate a channel of the first port; and the terminal sends a first factor to a network device, the first factor being used to compensate the estimated channel of the first port, and the first factor being determined at least by means of receiving gains corresponding to the first antenna port and a reference antenna port. The network device can compensate an uplink channel of the first port on the basis of the receiving gains of the first antenna port and the reference antenna port, so that the network device can estimate a downlink channel more accurately on the basis of the uplink channel, thereby alleviating the problem of non-reciprocity between the uplink channel and the downlink channel, improving the downlink precoding performance based on the uplink channel, and ensuring the receiving performance of the downlink shared channel of the terminal.

The invention provides an antenna phase center calibration method and system, a terminal and a readable storage medium. The method comprises the following steps: collecting carrier phase observation data corresponding to a to-be-tested antenna and a reference antenna; calculating a non-geometric distance combination observation value of the to-be-measured antenna and a non-geometric distance combination observation value of the reference antenna; subtracting the non-geometric distance combination observation value of the to-be-measured antenna at the corresponding frequency from the non-geometric distance combination observation value of the reference antenna to obtain an initial difference combination observation value, obtaining a non-cycle-slip difference combination observation value in combination with a preset cycle slip threshold, and constructing a target difference combination observation value; fitting a phase center change model corresponding to the to-be-tested antenna based on the target differential combination observation value and a preset satellite; and calibrating the phase center of a to-be-tested antenna based on the phase center change model. The antenna phase center calibration is completed by eliminating external error interference and fitting the phase center change model, and the antenna phase calibration accuracy is improved.

The invention discloses an unmanned aerial vehicle-mounted radio receiving noise reduction method and system based on flight control data, and belongs to the technical field of unmanned aerial vehicle communication. The method comprises the following steps: acquiring flight control data of the multi-rotor aircraft, wherein the flight control data comprises rotating speed parameters and / or flight attitude parameters of each rotation driving device; determining noise characteristic data corresponding to the current working state based on the flight control data; generating a noise offset signal according to the noise characteristic data; and carrying out synthesis processing on the noise offset signal and a receiving signal of a radio receiver so as to suppress electromagnetic interference generated by the rotation driving device. Flight control data is used as priori knowledge, cross-domain data fusion is achieved, additional reference antenna hardware is not needed, and the method has the advantages of being high in response speed and low in system complexity and is suitable for application scenes such as unmanned aerial vehicle-mounted medium-wave DRM digital broadcast receiving.

The application relates to the technical field of millimeter wave radars, and discloses an array channel correction method of a millimeter wave radar, which solves the problem of high cost of array channel correction of an existing millimeter wave radar, and mainly comprises the following steps: obtaining radar echo data of each receiving channel of a to-be-corrected array antenna under multiple rotation angles, and extracting measurement phase values of each receiving channel under each rotation angle according to the radar echo data; for each measurement phase value, a corresponding reference antenna is selected, and the reference antenna is dephased to obtain a target measurement phase value; the target measurement phase values of all rotation angles under each receiving channel are traversed, and the target measurement phase values corresponding to the rotation angles of phase value outliers are removed; theoretical phase values of each receiving channel under each rotation angle are calculated, and phase correction values of each receiving channel are determined according to the theoretical phase values and the target measurement phase values; and the spectrum data of each receiving channel are phase-corrected according to the phase correction values. The application reduces the phase correction cost.

This disclosure relates to 5G or 6G communication systems for supporting higher data transmission rates. A method performed by a user equipment (UE) includes: receiving information about a report, the information indicating an antenna group; determining a reference antenna group based on the information; and determining a first delay value and a second delay value for each antenna group based on the information and the reference antenna group. The method further includes: sending the report, the report including a first indicator indicating the reference antenna group, a second indicator indicating the interval to which the first delay value belongs for each antenna group, and a third indicator for each antenna group indicating whether the second delay value is within or outside a predefined range via a 1-bit indicator.

The invention provides a test system of wireless communication equipment and a control method thereof. The test system comprises a radio frequency shielding box and a radio frequency attenuator arranged in the radio frequency shielding box, the radio frequency shielding box is used for placing a wireless communication device and a signal transmitter, and the signal transmitter is used for transmitting a radio frequency signal to the wireless communication device through the radio frequency attenuator; the test system further comprises a power detection device and a reference antenna, the power detection device is connected with the reference antenna, and the power detection device is used for acquiring the actual receiving power of the radio frequency signal at the reference antenna; the test system further comprises a control device, the control device is in communication connection with the power detection device and the radio frequency attenuator, and the control device is configured to adjust the attenuation value of the radio frequency attenuator if the error between the actual receiving power and the target receiving power of the radio frequency signal is larger than a first threshold value. The error between the actual receiving power and the target receiving power is smaller than or equal to the first threshold value.

A radar apparatus and a radar signal processing method are provided. The radar apparatus includes a plurality of transmitting antennas, a plurality of non-uniformly and linearly deployed receiving antennas, a sensor signal processor configured to calculate target range-Doppler data from signals input from a receiving antenna arrangement according to virtual antennas while sequentially driving the plurality of transmitting antennas, and a target position calculator configured to calculate position data of a target from arrangement mapped data obtained by rearranging the virtual antenna-specific range-Doppler data output from the sensor signal processor with reference to antenna configuration related information.

A user equipment may be configured to assist channel reconstruction using partial spatial sounding. In some aspects, the user equipment (UE) may transmit, to another device, correlation capability information indicating a sounding reference signal (SRS) grouping capability of the UE, and receive, from the other device, reference signal (RS) configuration information for configuring a sounding procedure to be performed by the UE. Further, the UE may transmit a reference signal to the other device over a reference antenna port of the UE to allow the other device to determine channel information for another antenna port of the UE, and receive data from the other device based on the channel information.

The invention relates to a method and a system for near field reconstruction in an indirect far field system. The method comprises the steps of measuring a reference antenna (14) for orthogonal field components in a direct spherical near field system at a suitably geometry defined distance (R0), measuring the reference antenna (14) for orthogonal field components in an indirect far field system, and optimizing the orthogonal field components in the indirect far field system with respect to the orthogonal field components in the direct spherical near field system.

This invention discloses a precise attitude determination method and system based on the step-by-step resolution of GNSS multi-antenna multi-frequency ambiguities. First, the coordinates of the reference antenna in the ECEF coordinate system are calculated using reference antenna observations. Then, the rotation matrix from the ECEF coordinate system to the navigation coordinate system at the reference antenna is calculated. Next, based on GNSS multi-antenna multi-frequency observation data, a double-difference pseudorange and carrier phase observation equation is constructed between the reference antenna and each auxiliary antenna on the carrier. Subsequently, based on the double-difference pseudorange and carrier phase observation equation, a wide-lane carrier phase observation equation is constructed, and the double-difference wide-lane ambiguity of each baseline is obtained. This invention achieves high-precision attitude determination by step-by-step resolution of GNSS multi-antenna multi-frequency ambiguities and a combination of direct and least squares methods. Furthermore, by utilizing the advantage of easily fixed ambiguities in multi-frequency combined observations, the resolution efficiency of GNSS multi-frequency attitude determination is improved. This not only makes reasonable use of GNSS multi-frequency observations but also improves the accuracy of attitude determination.

The application discloses a noise vector direct estimation method for a receiver multiplexing single-target direction finding system of a BLE AoA / AoD type direction finding system, and belongs to the technical field of measurement and testing. The method estimates the autocorrelation coefficients of each antenna and a reference antenna by calculating the sum of the single-time acquisition data of each antenna in an antenna array and the single-time acquisition data of the reference antenna and then taking the average, and constructs an estimation matrix of a noise space feature vector from the estimated autocorrelation coefficients of each antenna and the reference antenna, without needing to perform matrix autocorrelation, eigenvalue decomposition, eigenvalue sorting and other operations. With the noise space feature vector provided by the application and a traditional direction finding algorithm, such as Root-MUSIC, high-precision direction finding effects can be obtained with lower computing resources, and the application is suitable for Internet of Things devices with limited computing resources.