176 results about "Phase response" patented technology

The invention discloses a light-operated reconfigurable metasurface for full-space terahertz wave beam regulation and control, solves the problem of how to provide ubiquitous full-space wave beam coverage for multi-user wireless communication application, and belongs to the field of artificial electromagnetic metamaterials. The super subunit comprises N super subunits which are arranged periodically, each super subunit comprises 4 * 4 identical coding units, corresponding codes are '0' and '1' respectively when illumination exists or not, and the phase response difference of the two coding units at 0.7 THz is 180 degrees. Each super subunit comprises five layers, the third layer is used for switching between reflection and transmission, when vanadium dioxide is in a medium state, the super surface is in a transmission mode, and when vanadium dioxide is in a metal state, the super surface is in a reflection mode. The first layer, the second layer, the fourth layer and the fifth layer are used for controlling the amplitude and the phase of the total-space terahertz wave, the conductivity of the photosensitive silicon pattern is changed under excitation of light with different intensities, the phase of the total-space terahertz wave beam is effectively modulated, and one-bit terahertz information coding is achieved.

The invention provides an LCOS linearity correction method based on a cubesat laser communication terminal, and relates to the technical field of communication, and the method comprises the steps: obtaining the corresponding relation between the driving voltage and phase response of an LCOS device; generating an initial correction curve; performing least square fitting according to driving voltage segments, and dynamically adjusting segment points until the slope difference of boundary points of adjacent segment curves is smaller than a preset threshold value; establishing a mapping relation table between the target phase value and the driving voltage; and temperature parameters are collected in real time for compensation and correction. According to the invention, the phase modulation precision of the LCOS is improved, and the on-orbit working stability of the system is enhanced.

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 relates to a reconfigurable reflection wide beam generation metasurface design method for enhancing indoor signal coverage, and belongs to the technical field of artificial electromagnetism, and the method comprises the following steps: designing a reflection metasurface unit which can correspond to different phase responses by changing the capacitance value of an adjustable capacitor; the value of the adjustable capacitor is selected to regulate and control the phase, and 1-bit phase quantization is realized; estimating the scale of the metasurface reflective array and the distance between the feed source and the center of the metasurface reflective array; a phase distribution diagram is calculated according to the phase compensation principle, the compensation phase of each unit in the metasurface reflection array and the corresponding capacitance value are searched from the phase distribution diagram, the units are arranged into a square reflection array, and after a feed source signal is added, the reflection array can generate an emergent wave beam with a preset angle; by changing the rotation angle of the capacitor moving plate, different phase responses to the unit are realized, and the array phase of the preset angle is compensated, so that reconfigurable beam generation can be realized under incident waves.

The invention provides a compensation device and system of an LCoS chip, and relates to the technical field of display. The device comprises a wavefront measuring module, a processing module and a micro-control module, the wavefront measurement module is used for measuring an interference pattern generated by the LCoS chip to be measured and measuring interference fringes generated when the LCoS chip loads different test gray-scale graphs; the processing module is used for processing the interference pattern to obtain initial surface type data of the LCoS chip, and processing the interference fringes to generate a gray scale-phase response curve of the LCoS chip; and the micro-control module is used for obtaining a voltage-phase compensation curve of the LCoS chip according to the initial surface type data and the gray scale-phase response curve, so that the phase of each pixel point on the LCoS chip in the compensated LCoS device is compensated based on the voltage-phase compensation curve, the accuracy of a compensation result is ensured, and the phase modulation uniformity of the LCoS chip is improved.

The application discloses a loudspeaker phase equalization signal processing system and a pole parameter determination method thereof, which equalizes the loudspeaker phase response in a set equalization frequency range to linear phase, and the system comprises a phase controller and a group delay equalizer in cascade; the phase controller is a first-order IIR all-pass filter; the group delay equalizer comprises S low-order IIR all-pass filters in cascade, wherein the first N1 low-order IIR all-pass filters are low-order causal IIR all-pass filters, and the last N2 low-order IIR all-pass filters are low-order non-causal IIR all-pass filters. The application can equalize the loudspeaker phase through the all-pass filter with low operation complexity and parameters, can significantly reduce the calculation amount required by low-frequency phase equalization, can improve the linear degree of the loudspeaker phase response, and can improve the sound quality and listening experience.

The embodiment of the invention discloses a spatial light modulator, a wavelength selection switch, optical communication equipment and a system, and relates to the technical field of optical communication, and the spatial light modulator comprises a first modulation assembly and a second modulation assembly which are sequentially arranged along a specific direction. The first modulation assembly comprises a first common electrode, a first pixel electrode array and a first liquid crystal layer located between the first common electrode and the first pixel electrode array. Liquid crystal molecules in the first liquid crystal layer are periodically arranged in a fan-column shape in a plane perpendicular to the incident direction of an optical signal. The second modulation assembly comprises a second common electrode, a second pixel electrode array and a second liquid crystal layer located between the second common electrode and the second pixel electrode array, and further comprises a super surface layer, a reflecting layer and a CMOS silicon-based backboard which are sequentially arranged in the specific direction. And pixel electrodes in the second pixel electrode array are electrically connected with the CMOS silicon-based back plate. The spatial light modulator has a polarization-independent phase response characteristic, and when the spatial light modulator is applied to a wavelength selective switch, output port switching of optical signals can be rapidly achieved without crosstalk.

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 ship sheet welding part deformation monitoring method and system. According to the method, controllable elastic disturbance is introduced into a welding area through a phased array sound wave excitation module, and tiny response of the surface of a welding part under the action of thermal stress is excited; a multi-frequency interference light intensity image of a welding area is obtained through a laser interference measurement module, phase responses under all sound wave frequencies are extracted through Fourier spectrum analysis, and a multi-frequency comprehensive disturbance amplitude graph is obtained; and in combination with temperature gradient information acquired by the thermal infrared imager, a disturbance direction vector field is constructed, and then a two-dimensional disturbance vector field of the welding area is generated. An abnormal deformation area possibly generated in the welding process is recognized in real time by constructing a judgment early warning mechanism, and visual early warning information is output. The method has the technical characteristics of non-contact, high precision, real-time performance and multi-dimensional cooperation, and is suitable for intelligent deformation monitoring and early risk early warning in the ship thin plate component welding process.

The invention relates to the technical field of computational fluid dynamics, and discloses a full-time-domain fluid dynamics simulation optimization method and system, and the method comprises the following steps: S1, collecting flow field data through a sensor, and constructing a time-domain Navi er-Stokes fluid dynamics model; s2, inputting the model in the S1 into a machine learning prediction module; s3, calculating a pneumatic phase lag amount and generating a complex frequency domain phase response function; s4, generating a virtual damping control instruction in real time; and S5, feeding back the damping control instruction optimized in the step S4 to the CFD solver. According to the method, reliable extrapolation of the evolution trend of the flow field is realized by fusing a physical solver and a two-channel prediction mechanism of the LSTM, the simulation time step length is remarkably expanded in combination with dynamic generation of a discrete phase compensation function, and the problem of rapid increase of computing resources caused by strict limitation of the time step length is solved; therefore, the simulation period of a complex fluid system is shortened.

An apparatus and method for cancelling leakage interference of phased array antenna based on microwave photonic. The apparatus consists of a signal generation unit, a splitter, a beaming unit, a transmitting antenna, a receiving antenna, a microwave photonic channel construction array, a control unit, a combiner array, and a signal receiving unit. The receiving antennas are divided into several receiving subarrays, and the microwave photonic channel construction unit corresponds to each receiving subarray, respectively. For each receiving subarray, a reference channel is constructed by adjusting the array of amplitude adjustment unit, the array of time delay adjustment unit, and the array of phase adjustment unit in the microwave photonic channel construction array. Thus, the reference channel has the matched delay, equal amplitude response, and opposite phase response relative to the leakage interference channel, based on which the leakage interference of phased array antenna is cancelled.

In some implementations, a radar device can determine a corner frequency associated with a first analog baseband processing component in a first receive (RX) channel of the radar device. The radar device can measure a baseband delay associated with the first analog baseband processing component. The radar device can 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 can digitize an analog output signal of the first analog baseband processing component to produce a digitized output signal associated with the first RX channel.The radar device can correct the digitized output signal based on the phase response to produce a phase-corrected output signal that is assigned to the first RX channel.

The invention relates to the field of 5G-A / 6G terminal equipment, and discloses a wireless terminal-oriented metamaterial intelligent antenna system, which comprises a liquid crystal adjustable metasurface array for receiving control parameters to adjust the phase response of each unit in the array so as to construct direction-controllable electromagnetic beams; the heterogeneous sensing module is used for collecting and processing multi-source data of the surrounding environment of the wireless terminal, and the multi-source data comprises Wi-Fi channel state information and millimeter wave radar reflection information; and the spatial modeling module is used for generating a sensing map of a spatial environment where the terminal is located according to the multi-source data. By constructing the liquid crystal adjustable metasurface array and applying continuous voltage to each unit of the liquid crystal adjustable metasurface array, fine phase control is achieved, rapid reconstruction and dynamic adjustment of the antenna beam direction are achieved, the effect of completing beam switching within the millisecond level is achieved, and the communication stability of a wireless terminal in a high-speed moving environment is effectively improved.

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 invention relates to a printed circuit board solder resisting method, which is characterized in that distinguishable miniature passive synchronous marks are preset in a PCB design stage, and optical phase coding is combined, so that multi-dimensional physical identifier embedding and automatic parameterization layout design are realized. Before and after exposure, a high-speed imaging detection and self-adaptive optical algorithm is adopted, phase response of multiple layers of synchronous marks is collected and normalized, multi-dimensional alignment reference features are extracted, a distribution alignment error model is established, overall rigid displacement and local stress deformation are distinguished, exposure equipment parameters are corrected in real time based on the model, and space error compensation is achieved.

The invention belongs to the technical field of nonlinear acoustics, and particularly relates to an array amplitude-phase consistency calibration method of a parametric array, a program, equipment and a storage medium. According to the invention, by measuring the amplitude phase response of the high-frequency sound wave emitted by each array element, the amplitude phase response of the difference frequency sound wave is determined and compensated, so that the array amplitude phase consistency calibration of the parametric array in multiple test scenes such as a pool and an anechoic chamber can be realized. The method has high robustness for installation errors, and the calibrated array elements have more consistent difference frequency amplitude-phase response. The method is simple in implementation mode, can be suitable for various test scenes, provides necessary pre-calibration for beam forming of the parametric array, and has high application value.

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.

A multi-input, multi-output audio processing is implemented as a linear system for use in an audio filter bank to convert a set of frequency-domain input audio signals into a set of frequency-domain output audio signals. The transfer function from one input to one output is defined as a frequency-dependent gain function. In some implementations, the transfer function includes a direct component that is substantially defined as a frequency-dependent gain and one or more decorrelating components having a frequency-varying group phase response. The transfer function is formed by a set of sub-band functions, where each sub-band function is formed by a set of corresponding component transfer functions that include the direct component and one or more decorrelating components.

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 invention discloses a physical layer authentication method based on mixed frequency hopping and channel phase response, and aims to improve authentication performance under various attack strategies. According to the technical scheme, frequency hopping (FH) is introduced in the authentication process, and a frequency hopping mode is generated through nonlinear transformation based on a timestamp and a shared key, so that it is ensured that the carrier frequency used in each authentication process changes randomly. Eve is difficult to effectively carry out interference attack or passive attack on the correct carrier frequency. Furthermore, in consideration that the time-varying characteristics of the wireless channel may not be well matched, particularly for some quasi-static channels, the FH may provide fast time-varying characteristics as the carrier frequency is updated during different authentication processes. According to the method, the anti-interference capability of the system is improved, so that a legal user can still keep a relatively high authentication success rate under interference attack.

The invention provides a metasurface structure and a design method thereof. The design method of the metasurface structure comprises the following steps: determining materials of a substrate and a metasurface unit on the substrate, and the shape of the metasurface unit; determining a transmittance curve and / or a phase response curve of the metasurface unit in the first size range; judging whether a resonance peak exists in the transmittance curve and / or the phase response curve or not; if the resonance peak exists in the transmittance curve and / or the phase response curve, adjusting the material and the thickness of the covering layer to eliminate the resonance peak; if no resonance peak exists in the transmittance curve and / or the phase response curve, it is judged that the design method is completed. The metasurface structure solves the problem that in the prior art, a metasurface structure has harmonic peaks in phase response, and therefore transmittance is affected.

The present invention relates to the field of chip performance testing technology, and specifically, to a performance testing and calibration method for a photonic interconnect chip based on a deep machine learning algorithm. It includes the following steps: calibrating the output of a light source, calculating the root mean square error of the light source power over time; considering the connection loss and alignment loss between the optical fiber and the chip, calculating the insertion loss and return loss; using a photonic chip deep learning analysis algorithm to analyze the spectral response and phase response of the chip, and calculating the spectral response width; measuring the output signal of the photonic interconnect chip to generate an eye diagram, calculating the signal-to-noise ratio and the bit error rate; placing the photonic interconnect chip in an environment with adjustable temperature, introducing the thermal expansion of the material to affect the calculation of the temperature coefficient, and establishing an optical output power model. This method effectively improves the accuracy and reliability of chip testing by compensating for connection loss and alignment error, and using a deep learning model to model transmission characteristics.

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 relates to a metasurface for electromagnetic waves. The metasurface comprises unit cells; each of the unit cells has a unique phase response and includes a plurality of independent scatterers. Furthermore, the present disclosure relates to a method for designing a metasurface for electromagnetic waves, where the method comprises providing unit cells in the metasurface, where each of the unit cells has a unique phase response and comprises a plurality of independent scatterers.