18 results about "Phase frequency response" patented technology

The invention discloses a servo steering engine performance parameter testing method and device and a medium, and relates to the technical field of industrial control, and the method comprises the steps: collecting the real-time feedback data of a servo steering engine, adjusting the frequency range and the frequency step length of a sweep frequency through employing a genetic algorithm, and generating a sweep frequency parameter; calculating the amplitude of the frequency sweep instruction and the amplitude of the steering engine operation feedback data based on the performance fitting data set, obtaining an amplitude-frequency characteristic curve, selecting a bandwidth frequency point when the amplitude is reduced to a specified proportion according to the amplitude-frequency characteristic curve, and generating a phase-frequency characteristic curve; analyzing the phase frequency response of the target frequency point according to the phase frequency characteristic curve, judging whether the phase requirement is met or not, obtaining the bandwidth qualification state, evaluating the overall performance of the servo steering engine, and generating a performance evaluation report. According to the invention, the automation and flexibility of the test process are improved, and the test efficiency and performance of the industrial control system are further optimized.

This invention discloses a low-overhead error calibration method and apparatus for array optical digitization systems. Addressing the issues of synchronization errors, mixing phase errors, and optical time-domain demultiplexing crosstalk errors that easily occur in multi-channel structures and synchronization processing of ultra-wideband array optical digitization systems, this invention proposes for the first time a method for joint extraction and correction based on the phase-frequency response differences of these three types of errors through a single injection of multi-frequency signals. This invention establishes a global error model for the array optical digitization system. By acquiring and analyzing the phase-frequency response of the decoupled signal through a single signal input, various major errors can be accurately separated and compensated, eliminating the need for complex iterative processes and additional reference paths, thus significantly simplifying the calibration process. This method effectively improves array channel consistency and digital beamforming accuracy, and has significant implications for enhancing the real-time performance and large-scale scalability of array photonic digitization systems. This invention is applicable to array optical digitization systems in various high-channel-count, wideband application scenarios.

The invention provides a consistency test method, device, system and equipment and a readable storage medium, and the method comprises the steps: obtaining a reference signal sequence and a to-be-tested signal sequence, the reference signal sequence and the to-be-tested signal sequence are electric signals synchronously generated by the reference microphone and the to-be-tested microphone in response to the same preset audio test signal respectively; according to the reference signal sequence and the to-be-tested signal sequence, obtaining a transfer function from the to-be-tested microphone to the reference microphone; based on the transfer function, calculating amplitude-frequency response and phase-frequency response of the microphone to be tested relative to the reference microphone; and obtaining a consistency test result of the microphone to be tested according to the amplitude-frequency response and the phase-frequency response. The objective and quantifiable consistency evaluation method provided by the invention can identify the fine consistency deviation which cannot be found only by an absolute performance test from a more comprehensive performance perspective, and realizes the automatic evaluation of the microphone consistency.

This application discloses an optical domain decoupling amplitude-frequency response equalization optimization method and apparatus. First, a system-level calibration is performed on the optoelectronic link, which includes an arbitrary waveform generator, intensity modulator, photodetector, and oscilloscope, to obtain the overall frequency response of the link, including amplitude and phase frequency responses. Then, the transmitter amplitude-frequency response is obtained through optical domain scanning and normalization. The receiver amplitude-frequency response is separated from the overall amplitude-frequency response through decoupling operations. Finally, a transmit-receive domain equalization strategy is used to complete transmit signal pre-distortion compensation and receive signal de-embedding compensation, respectively. This successfully achieves a balance between testing cost, testing time, and equalization performance, realizing low-cost, high-efficiency, and high-performance frequency response decoupling and equalization compensation for IMDD high-speed optical links. It provides an efficient, economical, and high-performance solution for the research and testing of IMDD high-speed optical modules.

This application provides a virtual playback simulation method, apparatus, device, and medium, relating to the fields of audio signal processing and audio playback device simulation technology. The method includes: acquiring an input audio signal and complex frequency response data of a target audio playback device, the response data including amplitude frequency response data and phase frequency response data; adaptively selecting a target algorithm from multiple preset virtual playback simulation algorithms according to preset application constraints; the multiple preset algorithms have different delay characteristics, accuracy levels, and computational complexity, and at least one algorithm adopts a frequency resolution processing method matching the characteristics of human auditory perception; using the target algorithm, processing the input audio signal based on the complex frequency response data to generate an output audio signal simulating the playback effect of the target audio playback device. This application improves the flexibility, accuracy, real-time performance, and perception optimization effect of virtual simulation through the organic combination of adaptive algorithm selection and auditory perception optimization.

Method for determining a function state (FZ) of an ultrasonic sensor (2) for a vehicle (1), having the steps of: a) applying (S1) an electrical test signal (P) to the ultrasonic sensor (2); b) detecting (S2) an electrical response signal (A) from the ultrasonic sensor (2); c) determining (S3) a phase-frequency response (PF) comprising the phase angle (α) of the detected response signal (A) for the applied test signal (P) on the basis of an excitation frequency (f) of the applied test signal (P); d) comparing (S4) at least a first phase angle (P1) below and a second phase angle (P2) above a resonant frequency (R) in the determined phase-frequency response (PF) with a respective expected phase angle (PE1, PE2); e) correcting (S5) the determined phase-frequency response (PF) on the basis of the comparison; and f) determining (S6) the function state (FZ) on the basis of the corrected phase-frequency response (PFK).

This invention discloses a method for testing the frequency characteristics of intelligent transformers based on smart grids, belonging to the field of power system testing technology. The method includes: injecting a sweep frequency excitation signal into the winding of the transformer under test and simultaneously acquiring the response signal to obtain amplitude-frequency and phase-frequency response data; performing logarithmic transformation and median filtering preprocessing on the amplitude-frequency data; constructing a high-order rational fractional transfer function model using a vector fitting algorithm; extracting complex poles and calculating the quality factor to construct a multi-dimensional pole distribution map; introducing a pre-constructed frequency band sensitivity matrix to divide the entire frequency band into characteristic frequency bands and preliminarily determine axial displacement faults in the winding coil; performing coordinate registration between the current pole map and the reference fingerprint pole set, calculating the offset vector, and diagnosing the defect type based on multiple criteria to generate a report. This invention can effectively suppress noise interference from complex electromagnetic environments, provide quantitative damage diagnosis indicators, and achieve highly sensitive and fully automated assessment of the mechanical state of transformer windings.

The invention discloses a high-precision rapid in-situ measurement device and method for polarization parameters of an atomic common magnetometer, and belongs to the technical field of quantum precision measurement and ultrahigh-sensitivity inertial measurement. Based on an atom manipulation technology, a transverse modulation magnetic field is applied to an atom ensemble through a three-axis magnetic field coil, a lock-in amplifier is adopted to extract device output phase frequency response, a longitudinal axis magnetic field is gradually scanned until the minimum phase frequency response is obtained, and therefore a nuclear spin polarization equivalent magnetic field and an electron spin polarization equivalent magnetic field are obtained. And further obtaining the electron spin polarizability, the nuclear spin polarizability and the nuclear spin longitudinal relaxation time. According to the invention, the rapid in-situ measurement of the atom ensemble polarization parameters of the SERF gyroscope is realized, and the measurement precision is improved.

The present application relates to a kind of methods for measuring the amplitude-frequency and phase-frequency response of radio frequency cavity, comprising: the digital radio frequency low level system generates sawtooth wave pulse frequency signal, and generates frequency control word;The digital radio frequency low level system generates sine data sequence and cosine data sequence according to the frequency control word, and the sine data sequence and the cosine data sequence are quadrature modulated, the output of the quadrature modulation is converted to digital-analog after output to the power source, and then the power amplifier is carried out power amplification and the directional coupler coupling after generation radio frequency signal input to the radio frequency cavity;The digital radio frequency low level system obtains the cavity pressure signal of the radio frequency cavity, and the forward voltage signal and reverse voltage signal of the directional coupler;The digital radio frequency low level system carries out real-time signal processing according to the cavity pressure signal, the forward voltage signal and the reverse voltage signal, and obtains the amplitude-frequency and phase-frequency response curve of the radio frequency cavity.

The embodiment of the application discloses a voice coil motor hysteresis modeling method and a related product, wherein the steps of the method comprise: determining a transfer function relationship between an output displacement and an input current, determining a phase frequency response and an amplitude frequency response relationship according to the transfer function relationship between the output displacement and the input current; and based on the phase frequency response and the amplitude frequency response relationship, fitting a voice coil motor hysteresis trajectory by using a neural network to obtain a voice coil motor hysteresis model. The scheme disclosed in the application can effectively describe the hysteresis phenomenon exhibited by the voice coil motor when the output millimeter-level displacement is output, and the description effect of the model basically remains unchanged with the change of the frequency, and the scheme has a more stable dynamic trajectory tracking effect than a pure NARX neural network model.

The application discloses a small frequency difference MEMS gyroscope detection phase shift suppression system, which is composed of a MEMS gyroscope, a driving loop, an angular velocity demodulation module and a parametric suppression loop. The application focuses on applying a parametric suppression signal to the detection resonator, electrostatically correcting the amplitude-phase frequency response, suppressing the detection phase shift under the small frequency difference mode, and improving the impact resistance. The detection resonator is embedded in the parametric suppression loop to generate stable amplitude self-excitation oscillation. A band-pass phase shifter is used to generate a parametric suppression signal twice the detection frequency from the detection amplitude multiplier. After the phase is shifted by 90 degrees to meet the parametric suppression phase condition, the parametric suppression signal acts on the parametric suppression electrode. Without losing the mechanical sensitivity of the MEMS gyroscope, the detection phase shift and the resonance peak amplitude at the detection natural frequency are suppressed, and the impact resistance is improved.

The application discloses a transformer winding short-circuit state detection method based on pulse frequency response curve characteristics, first extracts the anti-resonance point of the amplitude-frequency response curve and the L-C zero-crossing point of the phase-frequency response curve to carry out function fitting, calculates amplitude-phase coexistence fitness TS, judges whether the winding to be detected is faulty or not; then carries out gray scale transformation on the pulse frequency response curve image, calculates image metric relationship TC, distinguishes winding inter-turn short circuit or winding capacitor fault; after judging the winding capacitor fault, calculates the gray scale-gradient coexistence rate TM of the pulse frequency response curve image, and distinguishes winding inter-turn short circuit or pie inter-turn short circuit.

The invention discloses a hearing aid earplug sound leakage ultrasonic characteristic diagnosis method based on an intelligent sensor, and relates to the technical field of nondestructive testing, and the method comprises the steps: collecting the initial state data of a hearing aid, executing signal modulation and parameter calibration, and obtaining an earplug configuration and control list; according to the earplug configuration and control list, transmitting an ultrasonic detection signal to the hearing aid earplug, synchronously acquiring echo time domain data, and executing fast Fourier transform to generate an amplitude-phase frequency response curve; and performing feature crude extraction on the amplitude-phase frequency response curve by using an envelope detection method to form acoustic impedance anomaly spectrum features. Through the constructed loss acoustic model, accurate inversion of the leakage rate is realized, the diagnosis accuracy is remarkably improved, defect classification is performed by adopting an SVM algorithm, the sealing performance test instruction is generated according to a preset rule, closed-loop control from diagnosis to execution is realized, and the detection efficiency is remarkably improved.

The application discloses a kind of thermal coupling decoupling measurement methods based on composite sensitive structure, it is related to extreme environment sensing measurement technical field, provide composite sensitive structure: composite sensitive structure from bottom to top includes substrate, thermoelectric pile film formed on substrate, heat insulation layer formed on thermoelectric pile film, and piezoelectric film formed on heat insulation layer;Dynamic response characteristic matrix of composite sensitive structure is constructed: the thermal coupling coefficient between piezoelectric film and thermoelectric pile film when pressure and thermal excitation act simultaneously is calculated, and dynamic response characteristic matrix is constituted by amplitude-frequency response coefficient, phase-frequency response coefficient and thermal coupling coefficient.The application adopts the technical route of composite sensitive structure, dynamic characteristic matrix and frequency domain decoupling, solves the problem that traditional method is difficult to separate thermal coupling signal in real time from measurement principle, realizes the synchronous measurement of dynamic pressure and transient temperature under extreme environment.

The invention relates to the technical field of power equipment state detection, in particular to a transformer winding turn-to-turn short circuit degree evaluation and positioning method, system and device and a storage medium. Preparing a layered calibration sample and carrying out turn number calibration, replacing a winding sample layer by layer, collecting frequency response data and carrying out denoising processing, and constructing a sample data set covering different layers and short circuit degrees; mapping the phase-frequency response and the amplitude-frequency response into a polar graph, converting the polar graph into a grayscale image, extracting multi-dimensional texture features, and performing dimension reduction and weight distribution optimization to form a deformation evaluation matrix; frequency response data of a winding to be measured are collected, feature vectors are extracted, and two-dimensional matching calculation is carried out on the feature vectors and global features and layered features of the deformation evaluation matrix; an error correction factor is introduced to determine a short-circuit degree quantized value and position a fault layer number, and a fault level is determined according to an evaluation threshold and a result is output; the problems that in the prior art, sample preparation precision is low, data collection interference resistance is weak, a fault layer cannot be positioned, and evaluation adaptability is poor are solved.

The application relates to the general power transformer winding fault diagnosis technical field, in particular to a transformer winding fault diagnosis method based on a group delay residual network, which comprises the following steps: after injecting a sweep signal into one end of a transformer winding, measuring a response signal output from the other end, and obtaining a phase frequency response according to the measurement result; performing unwinding processing on the phase frequency response to obtain unwound phase frequency response; constructing a discrete Gaussian smoothing filter; performing noise filtering processing on the unwound phase frequency response by using the discrete Gaussian smoothing filter to obtain denoised phase frequency response; performing derivation processing on the diagonal frequency of the denoised phase frequency response to obtain a group delay spectrum; inputting the group delay spectrum into a one-dimensional residual network for feature extraction and classification to obtain a fault diagnosis result of the transformer winding to be measured.

The present application belongs to the technical field of satellite navigation jamming, and relates to a navigation jamming method and device for space-frequency adaptive anti-jamming unmanned aerial vehicles. The method comprises the following steps: dividing the navigation signal spectrum into several equal parts; randomly generating a first random number; generating at least one second random number; assigning the frequency point values of the signals emitted by the first jammer and the second jammer according to the value of the first random number and the second random number to obtain a frequency point signal, until the corresponding frequency point signals for all navigation signal spectrums are generated; converting the time domain signals to obtain the first sequence signal and the second sequence signal; and emitting the signals by the first jammer and the second jammer. The present application utilizes the characteristics of space-frequency adaptive processing, and through the cooperation of the two stations, induces the severe nonlinear phase frequency response of the spatial filter generated by the anti-jamming system, actively disturbs the phase of the satellite navigation signal, solves the problems of low efficiency and easy exposure of the traditional jamming, and can realize customized jamming.