22 results about "Frequency correction" patented technology

This invention discloses a distributed adaptive frequency regulation method for isolated microgrids. The method is executed collaboratively by each distributed power generation unit. First, it monitors the system frequency and its own status in real time to determine frequency regulation needs, and dynamically activates or suspends its frequency regulation participation status through an event-triggered mechanism. The activated frequency regulation participating units calculate dynamic weighting coefficients based on the frequency deviation direction, combined with equipment type, power generation stability, reserve power utilization rate, and operating costs. Then, it exchanges information with neighboring units through a sparse communication network, runs an adaptive distributed consensus algorithm based on the dynamic weights, and generates frequency recovery and power allocation control signals. After integration, a reference frequency correction is obtained, and the traditional droop control is corrected in real time to adjust the unit output. This invention can achieve dynamic adaptive allocation of frequency regulation priorities, reduce communication burden, quickly restore system frequency, and improve the stability and economy of isolated microgrid operation.

The application relates to the technical field of magnetic field measurement, in particular to a double-frequency resonance locking system of an NMOR atomic magnetometer based on FPGA, which comprises an FPGA, a laser modulation driving unit and a signal acquisition and processing unit, a homologous synchronous reference signal source, a first demodulation branch and a second demodulation branch are arranged in the FPGA, signals corresponding to a single Larmor frequency and double Larmor frequency are synchronously demodulated respectively to obtain corresponding in-phase signals and quadrature signals. The FPGA determines corresponding weight coefficients according to the output signals of the two demodulation branches, fuses corresponding frequency correction amounts and obtains a frequency control amount to adjust the laser modulation frequency. The system is also provided with a frequency sweeping and peak searching logic and a host computer parameter configuration module. The application is used for realizing that there is always a feedback signal with sufficient signal-to-noise ratio in the whole space range, so that the measurement blind area of the single-frequency NMOR magnetometer is eliminated.

The application discloses an elevator operation data monitoring method and system, and belongs to the technical field of control systems, and comprises the following steps: obtaining an elevator first sensing position, thereby analyzing a radar positioning determination result; if the radar positioning determination result is unqualified, S2 is executed, otherwise the operation is continuously executed; S2, a radar carrier frequency is adjusted in real time, and a radar carrier frequency adjustment determination result is analyzed; if the radar carrier frequency adjustment determination result is unqualified, S3 is executed, otherwise the operation is continuously executed; S3, a radar carrier frequency correction coefficient set is obtained; S4, an optimized and adjusted radar sensing real-time spatial position is obtained; S5, an optimized adjustment determination result is analyzed; if the optimized adjustment determination result is qualified, the adjustment is completed, otherwise self-shielding avoidance adjustment is carried out. The application solves the problem that the elevator radar positioning is not accurate due to external influence recognition real-time change, and realizes accurate positioning of the radar system.

This application discloses a frequency correction method, apparatus, computer equipment, and storage medium, belonging to the field of computer technology. The method includes: acquiring a time-frequency amplitude matrix and frequency sequence of a vibration signal from rotating machinery, where the frequency sequence indicates the first instantaneous frequency of the vibration signal at multiple time points; determining a target amplitude, a first adjacent amplitude, and a second adjacent amplitude of the vibration signal at each time point based on the time-frequency amplitude matrix and the frequency sequence; determining an offset parameter based on the difference between the target amplitude, the first adjacent amplitude, and the second adjacent amplitude; and correcting the first instantaneous frequency at each time point according to the offset parameter to obtain a second instantaneous frequency at that time point. This application overcomes the limitation of frequency resolution in the time-frequency amplitude matrix on the accuracy of instantaneous frequency, thus improving frequency accuracy.

The application relates to the technical field of radar calibration, and provides a ground-based lunar radar geometric calibration method. The method comprises the following steps: processing radar echo original data into a first radar image, each pixel in the first radar image having a range-Doppler coordinate; performing coordinate projection on each pixel in the first radar image to obtain the geographic coordinates of each pixel; performing homonym matching according to the geographic coordinates of each pixel to obtain a plurality of homonym point pairs; each homonym point pair comprises an oblique range-Doppler coordinate and a lunar surface optical image coordinate; performing geometric calibration according to the plurality of homonym point pairs to determine correction parameters; the correction parameters comprise a radar lower point oblique range correction amount, a radar lower point Doppler frequency correction amount, a range direction sampling frequency correction amount and a pulse repetition frequency correction amount; and obtaining corrected lunar surface geographic longitude and latitude coordinates according to the correction parameters. The application solves the correction amount from the radar parameter level, thereby realizing high-precision geographic positioning error correction that is universal in the full field of view.

This application relates to the field of power grid voltage control technology and relates to a PLL-based frequency controller and frequency control method. The purpose of this application is to address the problems of complex control and high switching risks associated with existing islanding detection algorithms combined with mode switching logic. This application generates a first frequency correction value based on the q-axis component of the common coupling point voltage; generates a second frequency correction value using the deviation between a fixed frequency reference and the real-time output frequency of the phase-locked loop (PLL); and synthesizes the first frequency correction value, the second frequency correction value, and the rated angular frequency to correct the PLL output frequency. By superimposing the correction value at the frequency output terminal to achieve feedforward compensation, the frequency deviation generated by the PLL automatically switches to dominate the frequency correction stage during off-grid operation, enabling the PLL to automatically adapt to both grid-connected and off-grid operating states.

This invention discloses a frequency correction and accurate testing method for low-frequency transformer core loss, belonging to the field of transformer performance testing technology. The method includes: standardizing and defining multi-factor frequency influence parameters and test constraint parameters for low-frequency transformer core loss to obtain standardized parameters; based on the standardized parameters, extending and modifying the traditional Steinmetz equation by introducing a skin effect correction factor, a temperature compensation coefficient, and a magnetic flux density coupling term to construct a frequency correction model; inputting the collected test data into the frequency correction model for loss calculation to obtain the measurement results of low-frequency transformer core loss. This achieves accurate measurement of low-frequency transformer core loss.

The present disclosure relates to a device for controlling a voltage balancing circuit for series-connected capacitors. The voltage balancing circuit comprises a first and second switching circuit being connected in series, and a resonant circuit. The first and second switching circuit may be connected in parallel to the series-connected capacitors. Each of the first and second switching circuit comprises a series connection of a first and second switching unit each comprising one or more semiconductor switches. A capacitor of the resonant circuit is connected between a node of the first switching circuit and a node of the second switching circuit. The device is configured to control, with a fixed duty cycle of 50% and a switching frequency computed using a resonant frequency of the resonant circuit, the first and second switching units. The device is configured to perform a resonant frequency correction method.

A frequency generator and a frequency correction method for a frequency generator, which have the purpose to provide a frequency correction technology that actively responds to continuous frequency fluctuations of a clock signal through a frequency measurement period of at least two unit periods. The frequency generator comprises: an oscillator which generates an oscillator clock signal; and a frequency correction circuit which selectively operates in one of a normal mode and a fast mode, which have different correction periods according to the state of the oscillator clock signal.

The application provides a control method and device of an independent variable frequency outdoor unit and an air conditioner. The control method of the independent variable frequency outdoor unit comprises the following steps: acquiring a connection pipe size and a real-time running frequency of a compressor; simulating an inner disc temperature according to the connection pipe size and the real-time running frequency of the compressor; determining a frequency correction coefficient according to a temperature difference between the inner disc temperature and a target inner disc temperature; and correcting a target frequency according to the frequency correction coefficient. The application solves the problem that the air conditioner unit control is not accurate, comfortable and energy-saving due to the fact that a pressure sensor is added at the gas return end of the compressor, the inner disc temperature data of the indoor unit is simulated through the pressure value, and 24V and 485 communication are taken into account.

The application discloses a surface acoustic wave resonator, a filter and a frequency correction method, and belongs to the technical field of resonators. In view of the problem that, in the frequency correction mode of the related art, the frequency correction precision is sensitive to the thickness of the silicon oxide layer and is prone to cause frequency over-adjustment or insufficient correction, the surface acoustic wave resonator provided by the application decomposes the overall frequency correction amount into multiple frequency adjustment layers, so that the frequency correction amount of a single frequency adjustment layer is reduced, the dependence of the frequency correction precision on the thickness of the frequency adjustment layer is reduced, and when the second frequency adjustment layer serves as a device protection layer, the protection performance and the frequency correction precision can be considered, so that the surface acoustic wave resonator can have good stability and obtain accurate resonant frequency.

This invention belongs to the field of control, specifically a method and system for graded crushing control of construction waste. It includes achieving refined crushing through multimodal sensing and collaborative control, acquiring multi-view texture images of the primary crushing chamber inlet; constructing a gray-level-gradient co-occurrence matrix and analyzing singular value entropy to represent the hardness dispersion of waste components, thereby adjusting the tilt angle of the moving jaw plate; extracting acoustic emission signals from each chamber, reconstructing the energy spectrum using wavelet packet transform, and calculating the KL divergence with the empty energy spectrum as a real-time load index; if the fractal dimension of the final stage aggregate projection profile exceeds the shaping threshold, extracting the secondary chamber load index to construct an attenuation function, generating a frequency correction factor to adjust the eccentric shaft speed, and combining the hardness and load weighted results to collaboratively control the inter-stage screening throughput, thus restoring the fractal dimension. This invention solves the problem of maintaining a balance between crushing throughput and energy consumption in the processing system, enabling intelligent graded crushing of construction waste.

This invention discloses a gapped waveguide antenna array, a frequency tuning kit, and a frequency correction method. The gapped waveguide antenna array includes a gapped layer that transitions from a first surface to a second surface along its thickness direction. The gapped layer has coupling holes. Both the first and second surfaces are provided with frame borders and multiple pins. A first cover plate is connected to the frame border of the first surface and has a radiation window. A second cover plate is connected to the frame border of the second surface and has a waveguide window. Multiple tuning dielectric blocks are included and can contact the pins of the gapped layer. The tuning dielectric blocks are replaceable. By providing replaceable tuning dielectric blocks, the frequency offset of the entire gapped waveguide antenna array can be adjusted according to actual conditions. Therefore, even if thermal or mechanical deformation occurs in the waveguide structure during production or use, the frequency offset can be compensated for later, maintaining high stability and reliability of the system.

Title: System and Method for Synchronizing Nonlinear Resonators in Chaotic Regime. The invention relates to a system comprising a first and a second generator (E1, E2) delivering excitation signals to a first and a second resonator (R1, R2) generating chaotic signals. The resonators (R1, R2) are structurally different and coupled to each other. Advantageously, this system allows the synchronization of chaotic signals and comprises: a dissipation correction module acting on the modulation frequencies fm1, fm2 of the excitation signals; a nonlinearity correction module acting on the amplitudes of the excitation signals; a resonance frequency correction module acting on the carrier frequencies fc1, fc2 of the excitation signals; and an amplitude correction module acting on the amplitudes of the chaotic signals. The invention also relates to a synchronization method based on this system.Figure for the abridged version: Fig.9.

The application provides a high-dynamic TT&C data transmission signal differential correlation acquisition method and device, and belongs to the technical field of signal acquisition. The method comprises the following steps: generating a local pilot sampling signal and obtaining a baseband discrete received signal; performing inter-symbol differential processing on the received signal and the local pilot sampling signal respectively to obtain corresponding differential signals; completing sampling time deviation acquisition based on the differential signals; constructing a carrier parameter acquisition window based on the sampling time deviation acquisition result, and obtaining an effective baseband signal by intercepting; completing carrier frequency deviation acquisition in the window based on the local pilot sampling signal; after frequency correction of the effective baseband signal by using the carrier frequency deviation acquisition result, extracting a phase by cross-correlation operation with the local pilot sampling signal to complete carrier initial phase deviation acquisition. The application can realize multi-parameter collaborative acquisition in a high-dynamic large frequency deviation scene, and improve the accuracy and robustness of signal acquisition.

This invention provides a frequency correction method, electronic device, and storage medium for vibrating wire strain gauges, relating to the field of vibrating wire strain testing technology. The method includes: acquiring a vibrating wire vibration signal; extracting fixture influence parameters based on the vibration signal; wherein the fixture influence parameters include: amplitude decay rate, quality factor of the vibrating wire vibration, and frequency fluctuation characteristic parameters; determining a frequency correction amount based on the fixture influence parameters; and subtracting the frequency correction amount from the measured vibrating wire frequency to obtain the target vibrating wire frequency. This invention, by acquiring a vibrating wire vibration signal and extracting characteristic parameters that characterize the fixture influence, such as amplitude decay rate, quality factor of the vibrating wire vibration, and frequency fluctuation characteristic parameters, achieves a quantitative characterization of the vibrating wire boundary conditions, fixture material, and structural stability, thereby correcting the measured vibrating wire frequency and improving the accuracy and stability of frequency measurement.

The application relates to the field of image processing, and provides an image relighting method and system based on asymmetric frequency space modulation, which comprises the following steps: performing encoder decoupling to obtain spatial intrinsic features and global illumination embedding vectors; performing group normalization and convolution operation to obtain intermediate features, performing linear projection and spatial dimension broadcast to obtain spatial broadcast illumination features, and obtaining a spatial modulation map according to the spatial broadcast illumination features and the intermediate features; performing normalization and feature extraction activation on the intermediate features to obtain dynamic weights, so as to obtain low-frequency components and high-frequency components; obtaining modulated low-frequency components by using the spatial modulation map and the low-frequency components, performing high-frequency correction on the high-frequency components based on the spatial modulation map to obtain modulated high-frequency components, and using the modulated low-frequency components and the modulated high-frequency components to perform relighting on an original image to obtain an output image; and training model parameters and performing image output to obtain a target output image. The application is used for completing image relighting.

This application discloses a frequency offset tracking method, apparatus, device, and medium, relating to the field of wireless communication. The method involves receiving a burst direct sequence spread spectrum signal; generating multiple parallel frequency correction values ​​based on the burst direct sequence spread spectrum signal and a local carrier; wherein the local carrier is generated based on the burst direct sequence spread spectrum signal; despreading the multiple parallel frequency correction values ​​to generate corresponding multiple parallel correlation matching values; merging the multiple parallel correlation matching values; and performing frequency offset tracking using a frequency-locked loop method and the merged correlation matching values. Therefore, the above scheme performs parallel multi-path frequency offset correction on the received burst direct sequence spread spectrum signal and then performs frequency offset tracking using a frequency-locked loop method. This not only achieves high-precision frequency offset tracking but also adapts to large frequency offset change rates, enabling frequency tracking of burst direct sequence spread spectrum signals under high dynamic conditions.

The present application relates to the field of automation detection, and more particularly to a kind of harness electrical performance automation detection method and system.The method includes obtaining harness fluctuation signal and carrying out amplitude-frequency and phase-frequency correction, obtain original time domain data and carry out fast Fourier transform, obtain frequency component sequence and carry out cross interference calculation, obtain line interference information;Threshold comparison is carried out based on the line interference information and feature classification is carried out, obtain coupling strength label and combine with the time domain feature parameter obtained by feature extraction based on the original time domain data, obtain feature vector group, then sequence prediction is carried out, obtain future time domain data and integrate with the original time domain data, obtain signal evolution trajectory;Signal oscillation information is obtained based on the signal evolution trajectory, extract abnormal value according to the signal oscillation information, obtain key feature vector, carry out fault risk calculation according to the key feature vector, obtain risk prediction report.

The present application relates to the technical field of satellite communication, and particularly to a method for real-time correction of frequency deviation of burst carrier, which solves the problems of poor receiving effect, complex manual correction operation, high professional requirement and low automation level caused by TDMA burst carrier frequency deviation in the existing VSAT satellite communication. The method is realized by cooperation of hardware platform and software. First, the TDMA carrier parameters are configured to FPGA to complete DDC data acquisition, and the DDC data is stored by using non-real-time mechanism. Then, the IQ data is preprocessed, multi-order spectrum FFT calculation and maximum retention buffer are completed, the carrier center point is positioned by high-order spectrum threshold value determination, and finally the frequency deviation is calculated and the carrier frequency correction is completed. The present application can automatically complete frequency deviation detection and correction without manual professional analysis, greatly improves the accuracy and convenience of TDMA burst carrier receiving, and is suitable for various burst carrier receiving scenes of VSAT satellite communication system.

This application relates to the field of satellite communication technology, specifically to a satellite communication frequency offset estimation and synchronization method, a storage medium, and a satellite communication terminal. The satellite communication frequency offset estimation and synchronization method includes: receiving a satellite radio signal containing a frequency correction channel burst and a broadcast control channel burst; detecting the frequency correction channel burst to obtain a coarse carrier frequency offset; locating the baseband data corresponding to the broadcast control channel burst in the satellite radio signal; pre-compensating the baseband data corresponding to the broadcast control channel burst using the coarse carrier frequency offset, and calculating the residual frequency offset for the residual frequency offset signal; obtaining the total carrier frequency offset based on the coarse carrier frequency offset and the residual frequency offset; and performing full compensation, demodulation, and channel decoding on the baseband data corresponding to the broadcast control channel burst using the total carrier frequency offset to obtain decoded data. This invention combines coarse estimation of the FCCH with fine estimation and verification mechanisms of the BCCH, ensuring the reliability of synchronization even under complex channel conditions.

The present application relates to a resonance sensor reading self-adaptive optimization method and system based on reinforcement learning, comprising the steps of: integrating the current sampling spectrum local maximum value set, the historical sampled spectrum local maximum value point set and its linear compensation trend to construct a state space vector, and taking it as the input of the reinforcement learning strategy network; fusing the action based on the strategy network output, the fusion action including the historical local selected maximum value point selection action and the corresponding compensation action, and the fusion action being used to simultaneously realize the spectrum peak value determination and the frequency correction; the present application can fully utilize the historical information and dynamic characteristics of the sensor by introducing the modeling method based on reinforcement learning, realize the real-time optimization of the reading, and overcome the problem that the traditional fixed filtering or single point correction method is not sensitive to interference; the fusion action mechanism adopted simultaneously considers the peak value selection and the frequency compensation, and significantly improves the anti-noise and anti-vibration ability of the resonance sensor in complex environment.