90 results about "Phase response" patented technology

A power transmission tower grounding resistance non-contact measurement method based on the electromagnetic coupling principle comprises the following steps that transmitting and receiving electromagnetic coupling coils are arranged around an iron tower grounding body, and geometric calibration and spatial positioning of a measurement area are completed by combining grounding grid structure parameters and soil conduction characteristics; injecting a high-frequency alternating-current excitation signal into the transmitting coil, and synchronously acquiring the amplitude and phase response of the induced voltage at a receiving coil end; carrying out filtering processing on the induction signal by adopting a time-frequency analysis and phase decoupling algorithm, and solving a function relationship between electromagnetic response and grounding impedance by combining a coupling equivalent model; based on experimental calibration data and scene parameters, a nonlinear mapping model of induction response and grounding resistance is constructed, and real-time inversion calculation is carried out by combining a solving result obtained in the third step. According to the invention, the real-time accurate measurement of the grounding resistance under the conditions of no power failure and no wire breakage is realized, and the safety, the operation convenience and the anti-interference capability in a complex environment in the measurement process are obviously improved.

The invention relates to the technical field of radio frequency signal processing, and discloses a digital filtering repair method and system for signal distortion, and the method comprises the steps: obtaining a frequency domain amplitude-frequency response and a phase response; constructing a phase compensation amount by adopting piecewise polynomial fitting and a phase inversion mechanism; a complex number logarithm domain mapping mechanism is adopted to execute composite frequency response inversion; constructing a switchable hybrid digital filter with an amplitude path and a phase path coupled in parallel; multi-band adaptive scheduling is executed; and outputting the radio frequency baseband signal stream. The technical problems that in the prior art, frequency response nonlinear distortion in a broadband range cannot be dealt with by adopting a fixed template or a single-path filter, and particularly, a high-precision and low-delay dynamic compensation effect cannot be realized in a scene that multi-band coupling interference exists in a radio frequency ADC channel with the bandwidth exceeding 800MHz are solved. Due to the fact that the switchable hybrid digital filter is constructed, accurate modeling and flexible recovery of distortion characteristics in broadband signals are achieved.

An example method for improving a metasurface design may include providing a first wavefront; providing a library of metasurface elements, wherein each metasurface element has a variable phase response; creating a metasurface design by selecting metasurface elements via the library based on the first wavefront; simulating an electromagnetic response of the metasurface design; measuring a second wavefront based on the metasurface design; calculating an error between the first wavefront and the second wavefront; and generating a new phase profile by subtracting the error from the first wavefront and the second wavefront. Various other methods, systems, and computer-readable media are also disclosed.

The invention discloses an unmanned aerial vehicle noise elimination method and device for cross-medium direct acoustic communication, and the method comprises the steps: carrying out the sampling of a known detection signal and a receiving signal, obtaining a frequency domain expression, calculating a cross-medium sound pressure transmission function, and extracting amplitude response, phase response and group delay; based on a normalization ratio and local maximum detection method, identifying a center frequency set of unmanned aerial vehicle propeller noise; the notch depth, bandwidth, frequency compensation and phase compensation are determined by combining channel characteristic parameters, and a cascade notch filter is constructed; and inputting the channel characteristic parameters into the deep learning model, outputting a filter parameter correction amount, realizing dynamic updating of the filter, obtaining the filter capable of suppressing noise, and further obtaining a denoised communication signal. According to the invention, precise detection of propeller noise frequency and multi-dimensional adaptive adjustment of filter parameters can be realized.

The invention relates to an intelligent state monitoring method and system for a high-voltage isolation switch operating mechanism, and relates to the technical field of power equipment fault diagnosis, and the method comprises the steps: enabling a collected real-time sequence to update a standard operation response potential energy surface, obtaining a real-time operation response potential energy surface, generating a phase response difference tensor through data projection, and obtaining a real-time operation response potential energy surface; and depicting deviation characteristics of actual and standard operation states. And then, in the constructed graph attention network, on the basis of a real-time sequence, monitoring parameters and video motion characteristics, constructing a multi-modal sequence state graph, and determining a state typing result through fine-grained recognition and interpretable analysis of a fault. And finally, introducing a cyclic fingerprint residual model, performing clustering optimization based on a real-time sequence, determining an abnormal deviation index, and combining the abnormal deviation index with a state typing result to determine a fault diagnosis result. Therefore, the accuracy of intelligent state monitoring of the high-voltage isolation switch operating mechanism can be effectively improved, and the method can be suitable for non-ideal environments, low dominant anomalies and other conditions.

The invention discloses a millimeter wave dual-polarization phased-array antenna beam forming method and device, and relates to the technical field of high-frequency communication, and the method comprises the following steps: obtaining a complex weight signal of each array element in an antenna array under a horizontal polarization channel and a vertical polarization channel, respectively carrying out amplitude response and phase response acquisition and calibration processing on the complex weight signal; performing dynamic extraction and modeling on amplitude errors and phase errors of each array element in different polarization channels; on the basis of error estimation, constructing a machine learning prediction module comprising a time sequence prediction model; performing joint estimation on a real-time error estimation result and a prediction error result; constructing a hardware-software collaborative calibration structure comprising a dynamic gain control module on the basis of the compensation weight; beam focusing of the target space area is realized; according to the invention, the hidden problems of beam offset, sidelobe lifting, gain loss and the like caused by inconsistency of polarization channels are solved.

The present invention relates to a method for managing the low frequency content obtained by a loudspeaker system comprising a plurality of loudspeaker devices, such as a surround sound loudspeaker system, wherein each individual loudspeaker device has a known response as a function of frequency under anechoic conditions comprising a phase response, the method comprising the steps of providing a plurality of loudspeaker devices (1, 2, 3, 4) and for each of said plurality of loudspeaker devices (1, 2, 3, 4) providing the corresponding phase response as a function of frequency obtained under anechoic conditions and for each of the individual loudspeaker devices (1, 2, 3, 4) inserting a filter device (5, 6, 7, 8) in the signal chain to the corresponding loudspeaker device (1, 2, 3, 4), where the individual filter device (5, 6, 7, 8) is configured such that the resulting phase response of each individual loudspeaker device (1, 2, 3, 4) under anechoic conditions is substantially the same for all of the loudspeaker devices (1, 2, 3, 4). The invention further relates to a loudspeaker system implementing the method of the invention.

The present application relates to the technical field of image processing, and more particularly to a self-adaptive periodic background elimination method based on Fourier analysis, comprising the following steps: step one, image input; step two, horizontal and vertical frequency division; step three, respectively performing inverse color, enhancement and normalization preprocessing operations on the horizontal frequency graph and the vertical frequency graph; step four, performing Fourier transform on the image of step three, and performing Fourier transform on the horizontal frequency preprocessed graph and the vertical frequency preprocessed graph; step five, obtaining high-amplitude phase difference of the image of step four; step six, obtaining horizontal and vertical phases; step seven, high-response point elimination; step eight, inverse Fourier transform, performing inverse Fourier transform on the separated frequency response graph and phase response graph in step seven; and step nine, feature recognition; the algorithm of the present application can automatically identify the periodic grid background on the liquid crystal panel, automatically eliminate a number of frequency parts with the highest response in the horizontal and vertical directions, and the remaining non-periodic features after elimination are defects.

The application provides a response measuring device for amplitude and phase of a nanoresonator. The response measuring device comprises: an arbitrary waveform generator for generating a first waveform signal and a second waveform signal; a nanoresonator for generating a vibration signal; a first radio frequency power divider for transmitting an equalized first vibration signal to a first signal path and a second vibration signal to a second signal path; a first processing module for multiplying the first vibration signal with the first waveform signal, filtering high frequency components in a first resultant signal, and obtaining an I(t) signal; a second processing module for multiplying the second vibration signal with the second waveform signal, filtering high frequency components in a second resultant signal, and obtaining a Q(t) signal; and a signal acquisition system for determining an amplitude signal and a phase signal of the nanoresonator according to the I(t) signal and the Q(t) signal. The application can replace a vector network analyzer to obtain the amplitude signal and the phase signal of the nanoresonator.

The present application relates to the technical field of acoustic device resource scheduling and conflict determination, first, a standardized multi-type excitation signal is applied to the measured device, audio input and output and near-field sound pressure signals are collected and fused, mel-frequency cepstral coefficients, harmonic-to-noise ratios and formant frequencies are extracted and combined to generate acoustic fingerprints, a multi-dimensional semantic association graph of acoustic fingerprints and physical resource nodes is constructed, and resource real-time mapping and occupation relationship tracking are realized. When scheduling a new task, multi-dimensional features and time sequence overlap queries are performed based on the fingerprint graph, and multi-level conflict state determination is combined with parameters such as phase response and formant shift. Through adaptive adjustment of the graph weight, dynamic optimization of resource conflict prediction is realized. The method improves the accuracy of task scheduling and the resource utilization efficiency in a complex acoustic test environment, and effectively reduces the test risk caused by resource competition.

The invention provides a cross polarization suppression system and method based on a reconfigurable phased array. The cross polarization suppression system provided by the invention comprises a reconfigurable phased array, a network analyzer, an external synthesizer and a control terminal, the reconfigurable phased array can reconstruct a plurality of independent wave beams; the control terminal is used for controlling and calibrating each channel of the reconfigurable phased array according to at least one expected directional angle under a specified working frequency; the control terminal is used for controlling the reconfigurable phased array to reconstruct the main beam pointing to each expected pointing angle; the network analyzer is used for testing the gain and phase response of the cross polarization component of the main wave beam for a specified angle; the control terminal is used for controlling the reconfigurable phased array to reconstruct the main and auxiliary beams pointing to the expected pointing angle; and the external synthesizer is used for synthesizing the main wave beam and the main auxiliary wave beam to generate a synthesized wave beam so as to suppress the cross polarization component of the main wave beam through the auxiliary wave beam.

The application relates to the technical field of semiconductor manufacturing, and discloses a wafer defect detection method, a wafer defect detection device and a medium. The method comprises the following steps: performing image processing on a target wafer image of a wafer object to be detected to obtain a plurality of local spectrum regions; performing complex filtering processing on the local spectrum regions in a plurality of scales and a plurality of directions to obtain response information of each local spectrum region under different scales and different directions; determining a phase consistency residual graph, a frequency band leakage residual graph and a direction offset residual graph based on phase responses and energy responses in the response information, a pre-constructed spectrum phase reference field, a main frequency band and a main direction; performing multi-scale residual back projection processing on the target wafer image to obtain a multi-scale residual back projection graph; generating a defect saliency graph based on any one or several of the phase consistency residual graph, the frequency band leakage residual graph, the direction offset residual graph and the multi-scale residual back projection graph; and performing defect detection based on the defect saliency graph to obtain a target detection result.

The invention discloses a radio frequency fingerprint extraction method and device, electronic equipment and a storage medium. The radio frequency fingerprint extraction method comprises the following steps: sampling a received signal, and carrying out down-conversion to obtain a baseband signal; frame synchronization is carried out on the baseband signal, carrier frequency offset compensation and phase offset compensation are carried out on the signal after frame synchronization, and a target signal is obtained; converting the target signal to a frequency domain to obtain a frequency domain representation; and according to the frequency domain representation of the target signal, a phase curvature feature is extracted as a radio frequency fingerprint, and the phase curvature feature is a second-order difference of phases between adjacent frequency points. According to the method, linear phase distortion introduced by channels can be effectively eliminated, and only nonlinear phase response caused by transmitter hardware distortion is reserved, so that robust radio frequency fingerprint extraction is realized under various channel conditions, and reliable support is provided for high-precision physical layer identity authentication.

The invention relates to the technical field of data processing, and further relates to a data extraction method and system for digital geological mineral exploration. Comprising the following steps: step 1, performing analog-to-digital conversion on multiple paths of original magnetic field response voltage signals synchronously acquired by multiple optical pump atomic magnetometer sensing units to obtain multiple paths of original magnetic field response digital sequences; 2, performing phase gradient field iteration reconstruction processing on the magnetic field in-phase response matrix and the magnetic field orthogonal response matrix to obtain a reconstructed phase matrix and a magnetic field amplitude matrix; and 3, calculating a magnetic field amplitude deviation matrix and a phase deviation matrix according to the magnetic field amplitude matrix and the reconstructed phase matrix, converting the mineral anomaly candidate position into a geological space coordinate, and outputting geological mineral anomaly feature data.

The application relates to a printed circuit board solder resist method, which realizes multi-dimensional physical mark embedding and automatic parameterized layout design by presetting distinguishable micro passive synchronous marks in the PCB design stage and combining optical phase coding. Before and after exposure, high-speed imaging detection and adaptive optical algorithms are used to collect and normalize the phase response of the multi-layer synchronous marks, extract multi-dimensional alignment reference features, establish a distributed alignment error model, distinguish the overall rigid displacement and local stress deformation, and based on the model, real-time correct the exposure equipment parameters to realize spatial error compensation.

A method for designing a metalens comprises selecting a group of metacells from a library at least based on their corresponding phase responses; receiving a description of incident optical signals and target optical signals; defining a phase rounding threshold value and a maximum number of rounding operations, wherein the phase rounding threshold value varies in terms of a rounding operation number; generating a phase for each metacell of the metalens with IFTA at least based on the description of the incident optical signals and the target optical signals; determining if the generated phase for each metacell meets the phase rounding threshold value, and if the phase rounding threshold value is met, performing a rounding operation by rounding the generated phase to the phase of one of the metacells from the selected group; and outputting the generated phases of all metacells when all rounding operations are completed.

The application discloses a kind of low-loss proportional amplification fluxgate current sensor measurement methods, it is related to current measurement technical field, including, obtaining the observation set of synchronous demodulation by phase-locked;Based on the scheduling optimization function of prediction set construction, apply soft opening constraint, amplitude stability constraint, phase consistency constraint and saturation depth constraint, output corresponding control variable;According to control variable setting excitation signal parameter and executing excitation drive and compensation injection, extract the harmonic amplitude-phase response of current cycle in demodulation window position;Harmonic amplitude-phase response is converted into linear measurement output of current cycle, while updating observation set.The application implements proportional closed-loop conversion in I / Q rectangular coordinates, combines amplitude error and phase error into compensation current update amount, and combines calibration proportionality coefficient and output amplitude limiting, so that closed-loop converges amplitude-phase deviation in linear interval quickly, improves compensation current stability and response speed and reduces energy consumption.

The invention discloses a measurement method of a fluxgate current sensor with low loss and scale amplification, which relates to the technical field of current measurement and comprises the following steps of: acquiring an observed quantity set subjected to phase locking synchronous demodulation; constructing a scheduling optimization function based on the pre-measurement set, applying a soft opening constraint, an amplitude stability constraint, a phase consistency constraint and a saturation depth constraint, and outputting a corresponding control variable; excitation signal parameters are set according to the control variables, excitation driving and compensation injection are executed, and harmonic amplitude phase response of the current period is extracted in the position of the demodulation window; and converting the harmonic amplitude-phase response into linear measurement output of the current period, and updating the observed quantity set at the same time. Proportional closed-loop conversion is implemented in I / Q rectangular coordinates, amplitude errors and phase errors are synthesized into compensation current updating quantity, and a calibration proportionality coefficient and output amplitude limiting are combined, so that a closed loop quickly converges amplitude-phase deviation in a linear interval, the stability and response speed of compensation current are improved, and energy consumption is reduced.

The invention discloses a frequency compensation system based on a low-noise operational amplifier, and relates to the technical field of analog circuit frequency domain modeling and stability optimizing.The unity gain frequency, the maximum phase lag angle and the low-frequency cut-off point of the operational amplifier are obtained; constructing a frequency compensation parameter group, and establishing an initial frequency domain stability model based on an open-loop transfer function; sequentially importing the compensation parameter groups into the model, performing frequency scanning simulation, extracting a phase response value under each compensation configuration, constructing a stability function, and performing label marking; further screening out a compensation parameter which meets the stability requirement and has the minimum capacitive reactance amplitude, and feeding back the compensation parameter for adjusting a frequency compensation loop; according to the method, fine modeling and optimal selection of the frequency compensation strategy are realized, the stability and efficiency of the system in low-noise and high-precision application are improved, and the method has good engineering applicability.

A method and system for real-time feedback self-calibration of phase mismatch in parallel demultiplexed photonic analog-to-digital conversion (ADC) systems are disclosed. This method processes and analyzes the output digital signal of an interleaved photonic ADC system, extracts phase mismatch information under system operating conditions by leveraging the characteristics of the inter-channel phase response curves, and constructs a feedback link combining a demultiplexing module and an optically adjustable delay module to achieve phase mismatch calibration. This invention overcomes the challenges of complex hardware design and cumbersome software algorithms in traditional ADC system calibration, achieving real-time feedback self-calibration without the need for external equipment. This invention is of great significance for improving the performance of time-interleaved photonic ADC systems and promoting their practical application.

An apparatus comprises: antennas to each receive energy across a radio frequency range; a controller; and receiver channels configured to (i) when energized, pass the energy received by corresponding ones of the antennas to the controller with phase responses that vary with temperature, and (ii) when de-energized, not pass the energy; wherein the controller is configured to perform: operating one or more first receiver channels of the receiver channels in an operational mode that continuously energizes each first receiver channel; and operating second receiver channels of the receiver channels that are not in the operational mode in a phase-keeping mode that cyclically energizes and de-energizes each second receiver channel to maintain temperature equilibrium across the second receiver channels.

In some implementations, a radar device may determine a corner frequency associated with a first analog baseband processing component in a first receive (RX) channel of a radar device. The radar device may measure a baseband delay associated with the first analog baseband processing component. The radar device may determine a phase response of the first analog baseband processing component based on the corner frequency, the baseband delay, and a phase transfer function model associated with the first analog baseband processing component. The radar device may digitize an analog output signal of the first analog baseband processing component to create a digitized output signal associated with the first RX channel. The radar device may correct the digitized output signal based on the phase response to create a phase corrected output signal associated with the first RX channel.

Tunable distributed oscillators (DOs) with flexible electrical length and associated systems, components, and devices are disclosed. In one aspect, a DO may include a plurality of DO units coupled in series. An individual DO unit includes a transmission-line segment having first and second ends and a middle portion between the first end and the second end. The DO unit further includes a first oscillator coupled with the first end, a second oscillator coupled with the second end, a first inductive matching circuit coupled between the first oscillator and the middle portion, and a second inductive matching circuit coupled between the second oscillator and the middle portion. By tuning the inductance or effective reactance of the first and second inductive matching circuits, the phase response of the DO unit may be adjusted so that the effective electrical length of the transmission-line segment is shortened relative to its physical length.

The invention discloses a switch self-phase-shifting passive phase shifter, which comprises a switch self-phase-shifting unit, a transmission line segment network and a phase error compensation network, and is characterized in that the switch self-phase-shifting unit comprises a single-pole double-throw switch, and the single-pole double-throw switch comprises a common end, a first throw end and a second throw end; the transmission line segment network is electrically connected with the single-pole double-throw switch and is used for providing different path lengths or equivalent phase responses for signals when the single-pole double-throw switch is in different switching states, so that a predetermined phase difference is generated; the phase error compensation network comprises an inductance element which is connected in parallel between a preset node of the single-pole double-throw switch and a reference potential; the inductance element and an inherent parasitic capacitor of the single-pole double-throw switch jointly form an LC network presenting a negative group delay characteristic in a target working frequency band, and the LC network is used for compensating a frequency-related error of a predetermined phase difference; according to the invention, the layout compactness and the array expandability are improved at the same time.

Embodiments are directed towards a method for designing a metalens, comprising selecting a group of metacells from a library at least based on their corresponding phase responses; receiving a description of incident optical signals and target optical signals; defining a phase rounding threshold value and a maximum number of rounding operations, wherein the phase rounding threshold value varies in terms of a rounding operation number; generating a phase for each metacell of the metalens with IFTA at least based on the description of the incident optical signals and the target optical signals; determining if the generated phase for each metacell meets the phase rounding threshold value, and if the phase rounding threshold value is met, performing a rounding operation by rounding the generated phase to the phase of one of the metacells from the selected group; and outputting the generated phases of all metacells when all rounding operations are completed.

An antenna device includes an antenna array having a plurality of antennas. An RF structure has a component that can vary phase response over frequency through the antenna array. A controller controls the component to create frequency-direction multi-beams from the antenna array. The antenna device can be part of an RF receiver and the RF structure can include a transmission line for each of the plurality of antennas and an RF signal connection to the transmission line for each of the plurality of antennas. The component can include a programmable delay element and a programmable phase element. The controller can set a delay of each programmable delay element and a phase each of programmable phase element in real-time to create frequency-direction multi-beams from the antenna array.

The embodiment of the invention provides a darkroom channel reconstruction method and device based on an RIS and electronic equipment, a tested device, an intelligent metasurface RIS and a probe wall are arranged in a darkroom, the RIS is arranged between the tested device and the probe wall, and the distance between the probe wall and the tested device is smaller than a preset threshold value; the method comprises the following steps: determining a target channel parameter of a target channel to be reconstructed; acquiring position information of the tested equipment, the RIS and the probe wall; according to the target channel parameters and the position information, the amplitude-phase response characteristics of the RIS are determined, and the amplitude-phase response characteristics of the RIS are used for indicating the regulation and control quantity of the RIS on the amplitude and the phase of the transmission signal; power characteristics of the probe wall are determined according to the target channel parameters and the position information, and the power characteristics are used for indicating transmitting power of each probe on the probe wall; and determining reconstructed channel characteristics of the reconstructed channel according to the position information, the amplitude-phase response characteristics of the RIS and the power characteristics of the probe wall. Through the method, the channel reconstruction error can be reduced.

The invention discloses a sound field spatial directivity regulation and control method based on a level sound pressure theory, and the method comprises the steps: taking a Helmholtz-like unit structure as an adjusting unit of a metasurface to construct a sound grating structure, and determining the surface of the sound grating structure according to the phase response of the Helmholtz-like unit structure. Solving the relationship between the sound pressure of the diffraction order in the specified direction and the surface phase response distribution of the sound grating structure; reconstructing a complete sound field directivity distribution function by adopting an interpolation method according to the sound pressure of the diffraction order; a cost function is determined according to the sound field directivity distribution function, a global optimal phase sequence solution is obtained based on a simulated annealing algorithm by adopting a Metropolis criterion, and regulation and control of sound field spatial directivity are achieved. The method does not depend on an iteration optimization method, so that an optimization result can jump out of local optimum more easily, the design limitation of the unit size and the number of types is broken through, more design freedom degrees are provided, and the design problem of a complex optimization target can be solved; and a new method is provided for searching global optimum.

Systems and methods described herein include a two-dimensional antenna array of antenna pixels having length and width dimensions of less than one-half of an operational wavelength. In various examples, each antenna pixel comprises a fixed number of phase-adjustable antenna elements. The antenna elements of each antenna pixel may be coupled to the waveguide with interelement spacings selected to associate each antenna element with a distinct phase advance value. A controller identifies a target phase value for each antenna pixel that corresponds to a target beamform for the two-dimensional antenna. A controller activates and adjusts a phase response of one of the antenna elements in each antenna pixel, such that the phase advance value associate with the activated antenna element and the adjusted phase response combine to attain the target phase value for the antenna pixel as a whole.

The invention discloses an aircraft bumping monitoring method based on identical weak reflection fiber bragg gratings, and belongs to the field of flight safety monitoring. The method comprises the following steps: firstly, arranging an identical weak reflection fiber grating array, acquiring a phase response signal of each grating point, and constructing an original vibration signal of an aircraft wing; secondly, performing power frequency interference suppression processing on the original vibration signal of the aircraft wing to obtain a mixed vibration signal; thirdly, denoising the mixed vibration signal to obtain a boundary layer disturbance vibration signal; finally, feature extraction is carried out on the boundary layer airflow disturbance vibration signals, the boundary layer state is judged, and boundary layer separation points are positioned; and extracting the time-frequency characteristics by adopting a wavelet transform method, identifying a boundary layer separation point and judging a boundary layer state. According to the method, the stall risk can be pre-warned in advance by combining the dynamic behavior of the separation point according to the location of the boundary layer separation and the state change trend of the boundary layer, and the bumping intensity can be quantitatively evaluated according to the amplitude of the output boundary layer disturbance vibration signal.