66 results about "Phase filter" patented technology

The invention discloses an InSAR (Interferometric Synthetic Aperture Radar) phase filtering method based on a plurality of interferograms, which comprises the following steps of: preprocessing acquired main and auxiliary SAR images to obtain the plurality of InSAR interferograms; dividing the plurality of InSAR interferograms into square interferogram patches along the azimuth direction and the distance direction; converting each interferogram patch from a spatial domain into a frequency domain signal, and constructing a corresponding frequency spectrum amplitude diagram; using a K-means clustering method to cluster and extract an initial low-pass filter in the spectrum amplitude diagram, and constructing a phase filter together with a Kaiser window function; the frequency domain signals of the interferogram plaques pass through a phase filter, the signal frequency band power is reserved, the noise at the high-frequency position is filtered out, meanwhile, the noise at the low-frequency position is filtered out through smoothing operation, and the filtered frequency domain signals are obtained; and the filtered frequency domain signals are converted to a spatial domain, filtered interferogram patches are obtained and spliced, and a filtered InSAR interferogram is obtained. The method is beneficial to popularization and promotion of the development of the current time sequence InSAR interferometry technology and the application in engineering.

The invention belongs to the technical field of electronic search, and relates to a radio reconnaissance method and system based on multichannel parallel processing and intelligent clustering, and the method comprises the steps: carrying out the multi-phase filtering digital channelization processing of a broadband radio signal, so as to obtain adjacent channel sequences with overlapped frequency bands; performing square law detection and constant false alarm detection on each channel sequence to generate an initial pulse description word; establishing a candidate corresponding relationship in adjacent channels based on arrival time similarity and noise consistency, and determining a cross-channel merging relationship according to frequency range continuity and frequency-time relationship slope consistency to generate a complete pulse description word; performing hierarchical clustering sorting based on the arrival angle and the pulse width; and performing multi-stage differential analysis on a clustering result to extract a repetition frequency sequence and determine a repetition frequency type. According to the technical scheme, the stability and consistency of cross-channel pulse merging and sorting results can be kept under the broadband high-density condition, and the radio search processing precision under the complex electromagnetic environment is improved.

The invention discloses a broadband low-power-consumption receiving and transmitting shared phase shifter which comprises a differential signal common port, a frequency sampling and control circuit, a dual-mode orthogonal generation circuit and a passive vector modulation synthesis circuit. The differential signal common port comprises a common input / output port interface of RF + and RF-differential radio frequency signals; the frequency sampling and control circuit is composed of a frequency sampling circuit, a frequency detection circuit and a logic control unit. The dual-mode orthogonal generation circuit is composed of a frequency selection change-over switch, a multi-phase filter, a coupling transformer, a matching network 1 and a matching network 2. The passive vector modulation synthesis circuit is composed of two passive vector modulation arrays and two combining / power dividing circuits.

The invention discloses a control method and system for a network-building type energy storage converter. The control method comprises the following steps: acquiring a three-phase filter inductance current value of the network-building type energy storage converter in real time; according to the three-phase filter inductance current value, determining the working state of the grid-forming type energy storage converter; when the converter is in an overload operation state, outputting switching frequency trigger adjustment information to adjust the switching frequency of the switching device to a first switching frequency, and outputting modulation switching trigger information to switch a first modulation mode to a second modulation mode; obtaining a first three-phase filtering inductive current maximum value according to the three-phase filtering inductive current value; switching frequency recovery information is output according to the first three-phase filter inductive current maximum value so as to adjust the switching frequency of the switching device to a second switching frequency; and outputting modulation mode switching information according to the second switching frequency so as to switch the second modulation mode to the first modulation mode, thereby enabling the converter to enter a stable operation state. Therefore, the short-time overload capacity of the grid-forming type energy storage converter is improved.

The invention belongs to the technical field of digital communication, and particularly relates to a multi-phase filtering channelized ultra-wideband signal detection and fusion method and system.The multi-phase filtering channelized ultra-wideband signal detection and fusion method comprises the steps that channelization is conducted, specifically, a receiving bandwidth is evenly divided into K sub-channels, 50% overlapping is adopted between every two adjacent sub-channels, the method comprises the following steps: designing an appropriate prototype filter according to frequency response, determining a multiphase filter coefficient according to the number of sub-channels and the prototype filter, carrying out D-time extraction at the front end of the multiphase filter, enabling the extracted signal to enter the multiphase filter for filtering, and then carrying out fast Fourier inverse transform on K points output each time to obtain output signals of K sub-channels, time domain amplitude detection: acquiring arrival time and pulse width information of the signal in a time domain; according to the method, the problems of missing detection and feature detection errors of multiple time domain overlapped signals in a single channel are solved, and accurate broadband signal parameters are obtained by using the corresponding relationship between the signal frequency domain and the channel passband.

The invention discloses a power line communication signal sending and receiving method and device based on a semi-parallel architecture, and belongs to the technical field of power system communication. The method comprises the following steps: obtaining a sending signal comprising a plurality of sub-signals, dynamically determining the number R of parallel processing units according to a transmission data rate and a clock frequency, phase adjustment, frequency domain transformation, linear combination and filtering processing are carried out through R parallel processing units in the DCT module, the matrix module and the multi-phase filter module in sequence, and finally processed signals are serialized and sent to a power line channel; and the receiving process reversely executes corresponding processing. Therefore, by implementing the method and the device, the problem that the transmission rate and the communication stability of the system are difficult to effectively improve while low resource consumption and low power consumption are ensured in the prior art can be solved.

One example system for detecting an emergency siren comprises a microphone device, a band pass filter operably coupled to the microphone device and configured to filter sound data from the microphone device to produce filtered sound data, a phase lock loop circuit configured to phase filter the filtered sound data to produce phase filtered data, and a processor configured to determine a presence of a siren signal from the phase filtered data.

The invention discloses a multi-scale complex feature extraction method and system based on a lightweight two-step filter network. The method comprises the following steps: S1, constructing a filter training data set based on a digital elevation model and Gaussian noise; s2, constructing a multi-scale complex feature extraction network model of lightweight two-step filtering; s3, training a multi-scale complex feature extraction network model by using the filtering training data set; and S4, performing phase filtering processing on the terrain interferogram by using the trained multi-scale complex feature extraction network model to complete feature extraction. According to the method, lightweight U-Net and depth separable convolution are introduced, so that the parameter quantity and calculation complexity of the model are greatly reduced, and meanwhile, a two-step filtering mechanism based on complex conjugate operation is combined, so that refined extraction and optimization of complex features are realized; and through the residual attention module and the multi-scale feature fusion module, the cross-scale feature expression capability of the network is enhanced, and the robustness and anti-noise performance of the model are improved.

The invention belongs to the technical field of synthetic aperture radars, and particularly relates to a relative atmospheric wind speed measurement method based on time delay D-I nSAR. The method specifically comprises the steps of 1, obtaining differential interferograms of all distributed SAR satellites, and performing multi-view and phase filtering on the differential interferograms of all the satellites; 2, carrying out thresholding processing on the obtained image, converting the image into a binary image, and identifying water vapor group feature points; calculating an initial wind speed v0 by using the center displacement vectors of the feature points of the two adjacent images; and step 3, performing coordinate system conversion and coordinate axis length conversion on the obtained initial wind speed to obtain a two-dimensional relative wind speed of an atmospheric water vapor dense height layer of a plane parallel to the ground between two moments of satellite heavy orbit observation.

The invention provides a two-degree-of-freedom fundamental frequency modulation method and device of a multi-level current source converter. And triggering each bridge arm in the multi-level current source converter by adopting a fundamental frequency modulation mode according to a preset first degree of freedom and a preset second degree of freedom under the condition that the terminal voltage of the U-phase filter capacitor has a zero crossing point moment. On the basis of the first degree of freedom and the second degree of freedom, the switching speed of a semiconductor device on a bridge arm in the multi-level current source converter can be reduced by adopting a fundamental frequency modulation mode, and the harmonic quality of the multi-level current source converter is greatly improved, so that the operation loss of the multi-level current source converter is reduced, and the service life of the multi-level current source converter is prolonged. And the sampling cost and the control cost of the sensor are reduced. The multi-level current source converter can realize decoupling of voltage and power, so that the operation of the multi-level current source converter is more flexible and efficient.

The present application relates to the technical field of visible light communication, in particular to a FTN-mCAP interference mitigation method and system based on gap index modulation, comprising: using FTN-mCAP-GIM mapping at the transmitting end, using a gap index mechanism to activate k subbands in m subbands; the gap activation mechanism is that adjacent subbands cannot be activated at the same time; the m subband signals are up-sampled, the real part and the imaginary part of each subband signal after up-sampling are subtracted after passing through FTN in-phase filters and FTN quadrature filters respectively, and the target signal of each subband is obtained; the target signals of all subbands are combined to generate a transmitting signal. The present application can effectively avoid excessive overlap of different subbands in the frequency spectrum, reduce the inter-band interference generated at the transmitting end, achieve better bit error rate performance, and save bandwidth resources.

This invention relates to the field of power edge computing technology, specifically to a data filtering and transmission method and system based on an edge gateway. The method includes the following steps: generating an original power quantity sequence; constructing a dynamic phase filtering matrix; performing projection comparison on the mapping matrix to accurately separate and extract intrinsic feature components; calculating degradation trend values ​​and determining dynamic transmission priorities; and performing communication scheduling and distribution on the feature components, with high-priority components sent immediately and low-priority components merged after delay. In this invention, by performing multi-dimensional projection comparison on high-frequency sampling points, components reflecting the actual operating status of power distribution equipment are accurately extracted, false mutations are eliminated, and real faults are retained. Transmission priorities are calculated by combining channel congestion and degradation trend values. Status information is classified and graded for scheduling, transmission, and merging, completely eliminating the omission of critical early warning information, reducing the occupation of limited network bandwidth resources by redundant and invalid messages, and ensuring long-term stable operation of cross-level communication.

The invention discloses a TCN-based vehicle-mounted sound equipment equalizer compensation method and system, and relates to the technical field of vehicle-mounted electronic equipment, and the method comprises the steps: playing a test signal in a vehicle-mounted environment, collecting a distorted time domain waveform affected by an acoustic environment in a vehicle through a microphone, and carrying out the preprocessing of the distorted time domain waveform; inputting the processed waveform into a time convolution network, extracting multi-scale time sequence features, and predicting to obtain a first half segment coefficient of a linear phase FIR filter after global average pooling and full connection layer mapping; carrying out symmetrical overturning splicing on the front half segment coefficient, constructing a complete linear phase FIR filter coefficient, and carrying out direct current gain normalization processing; and finally, carrying out one-dimensional convolution operation on the normalized FIR filter coefficient and an original audio signal, and outputting an equalized audio signal subjected to frequency response compensation. According to the invention, the adaptive equalization compensation of the vehicle-mounted audio system is realized, and the tone quality performance and the hearing experience are remarkably improved while the linear phase characteristic is ensured.

An electronic device testing method includes providing an electronic device including a sensor layer and a sensor driver, and testing the electronic device as the sensor driver transmits a test signal to the sensor layer. The sensor layer includes a plurality of first electrodes and a plurality of second electrodes. The sensor driver includes an in-phase filter and a quadrature phase filter. The testing of the electronic device includes testing the sensor driver. The testing of the sensor driver includes transmitting the test signal to the plurality of first electrodes and receiving a sensing signal through the plurality of second electrodes, outputting a first test value, outputting a second test value, and comparing the first test value and the second test value.

A quantitative phase contrast imaging system comprises a light source configured to generate light and to direct the light to a sample, wherein the light comprises nonlinearly polarized light; a first lens configured to receive light from the sample; a phase filter, wherein the first lens is configured to focus the light from the sample onto the phase filter, and the phase filter is configured to modulate multiple components of the nonlinearly polarized light simultaneously (e.g., geometric phase interferometry); a second lens configured to receive light from the phase filter; and a polarized camera, wherein the second lens is configured to collimate the light beam from the phase filter to the polarized camera and the polarized camera is configured to image the sample in response to the light from the phase filter. In absence of the second lens, the camera can be placed at the image plane.

The utility model relates to the technical field of filters, in particular to a phase filter. Comprising a case, a shock absorber is arranged on the case, a liquid cooling plate is arranged in the case, a cooling passage is arranged at the bottom of the liquid cooling plate, a cooling liquid inlet and a cooling liquid outlet are arranged outside the case, and the cooling liquid inlet and the cooling liquid outlet are oppositely arranged and both communicated with the cooling passage; a first filter path and a second filter path are further arranged in the machine box, the first filter path and the second filter path are mutually independent, and the first filter path and the second filter path each comprise a temperature control circuit breaker. According to the phase filter, the inductance device is used for reducing capacitive hazards in a three-phase alternating current power grid, the temperature control circuit breaker is arranged to guarantee safe operation of the filter, and a liquid cooling heat dissipation mode is adopted to guarantee stable and continuous operation of the filter.

The utility model discloses a three-phase interlaced PFC control system which comprises a three-phase filter circuit, a three-phase rectifier circuit, a three-phase interlaced power factor correction circuit, a three-phase AC input current detection circuit and a microcontroller. The input end of the three-interlaced power factor correction circuit is connected with the output end of the three-phase rectification circuit, and the output end is connected with a load; the input end of the three-phase AC input current detection circuit is connected with the three-phase power, and the output end of the three-phase AC input current detection circuit is connected with the microcontroller; the microcontroller collects an output end signal of the three-phase rectification circuit, an output end signal of the three-interlaced power factor correction circuit and an output end signal of the three-phase AC input current detection circuit, and drives the three-interlaced power factor correction circuit. According to the utility model, the problems of overhigh instantaneous voltage and current stress of a single-path PFC are solved, and the unbalance degree of three-phase current is obtained by adding the three-phase AC input current detection circuit, so that the driving mode of the three-path PFC unit circuit is adjusted, and the safety and stability of the system are ensured.

The utility model belongs to the technical field of mobile phase filtering devices, and particularly relates to a novel multifunctional mobile phase filtering device which comprises a mounting frame, a first supporting plate fixedly connected to the end of the mounting frame, a connecting pipe fixedly connected to the bottom of a tank body, and a fixing column fixedly connected to the inner side wall of a first mounting groove. A second mounting groove is formed in the bottom of the connecting pipe, a sealing ring is mounted in the second mounting groove, a filter pipe is movably connected to the interior of the second mounting groove, a limiting convex ring is arranged at the end of the filter pipe, a limiting ring is fixedly connected to the inner side wall of the connecting pipe, and a supporting ring is fixedly connected to the inner side wall of the filter pipe; the top of the supporting ring is movably connected with a filter membrane base, and the bottom of the limiting ring is attached to the top of the filter membrane base. According to the utility model, the limiting frame and the limiting convex ring are arranged, so that the filter pipe and the filter membrane are convenient to replace; and the intermittent rotating assembly is arranged, so that the device has multiple functions.

The application belongs to the technical field of radio frequency communication, and discloses a novel wideband linear phase filter and a design method thereof. The novel wideband linear phase filter comprises a first port, a second port, and three first transmission lines connected in series between the first port and the second port. Four connection points are formed between the first port and the adjacent first transmission line, between the three first transmission lines, and between the second port and the adjacent first transmission line. Four short-circuit branch lines are connected at the four connection points one by one. An inductance circuit module is connected at one end of the connection point between the first port and the adjacent first transmission line, and connected at the other end of the connection point between the second port and the adjacent first transmission line.

The invention discloses a sampling rate conversion device and method and an audio playing system, in the sampling rate conversion device, a control unit determines a target filter order and a target step value based on an input sampling rate and an output sampling rate; a filter coefficient generation unit determines a target filter coefficient and a historical filter coefficient based on a multi-phase filter basic coefficient table according to sampling point address information of a target input sampling point, a target filter order and a target step value; and the multi-phase filter convolution unit performs convolution operation on the target input sample point, the target filter coefficient, the historical sample point and the historical filter coefficient based on the target filter order to obtain a target output sample point. As the order of the target filter is dynamically generated according to the input sampling rate and the output sampling rate, the filtering coefficients can be determined based on the same polyphase filter basic coefficient table for different sampling rate conversion specifications, the storage space is saved, repeated switching of the coefficient table is not needed, the conversion steps are simplified, and the conversion efficiency is improved.

The invention discloses an InSAR (Interferometric Synthetic Aperture Radar) phase filtering method, device and system and a storage medium. The InSAR phase filtering method comprises the following steps: S1, acquiring an InSAR simulated data set; s2, according to the data set simulated by the InSAR, constructing a multi-scale convolutional neural network model based on physical constraints; and S3, inputting real SAR data into the multi-scale convolutional neural network model to carry out InSAR phase filtering. By adopting the technical scheme of the invention, effective noise suppression, detail maintenance and result stability are realized.

The invention relates to the technical field of signal and information processing, and particularly discloses a gear vibration signal decomposition method based on improved group sparse mode decomposition, which comprises the following steps: S1, measuring a gearbox to obtain gear vibration data; s2, using discrete Fourier transform to obtain a vibration signal frequency spectrum; s3, performing group sparse optimization on the frequency spectrum, and constructing a zero-phase filter group; s4, decomposing signal frequency spectrum filtering by using a zero-phase filter bank, and performing inverse Fourier transform to obtain a modal component; s5, calculating the periodicity of all groups of sparse mode components; s6, fusing the group sparse mode components with relatively high period similarity into an intrinsic mode component; and S7, selecting a fault component, extracting a fault characteristic frequency, and carrying out fault diagnosis. According to the method, the problem that the integrity of the gear fault feature information is damaged due to an over-decomposition phenomenon generated based on group sparse mode decomposition in the prior art is solved, the gear fault feature information can be protected, and the vibration feature of the gear signal is effectively extracted.

The application discloses a low-resource-overhead super-high-speed modulation and demodulation method. In view of the signal processing demand faced by high-frequency bands and large bandwidths in millimeter wave and terahertz communication, the application adopts a parallel architecture to meet the high-speed signal processing demand and correct non-ideal characteristics of a channel; and adopts a fusion processing method to fuse interpolation, anti-aliasing, timing interpolation, matched filtering, time domain equalization and decimation into a multi-phase filter, so that the signal overhead caused by high-speed demodulation is greatly reduced. The application can be applied to a millimeter wave / terahertz super-high-speed transmission system, and provides low-complexity super-high-speed modulation and demodulation to meet the performance and resource demand of super-high-speed transmission.

The invention discloses a self-diagnosis method, system and device for the protection state of energy storage variable flow test equipment and a storage medium. The self-diagnosis method comprises the steps that a controlled perturbation excitation signal is injected into the input end of a protection link of the energy storage variable flow test equipment; performing synchronous sampling on response signals of all levels of function units in the protection link, performing baseline correction on the sampled signals, and performing in-phase filtering processing on the sampled signals to obtain preprocessed response signals; extracting a protection time sequence response fingerprint parameter corresponding to each level of function unit; performing energy calculation on the pre-processing response signal of each level of function unit to obtain an energy characteristic parameter of the protection link; constructing a protection link structure invariant parameter based on the protection time sequence response fingerprint parameter and the energy characteristic parameter; and performing consistency calculation on the structure invariant parameter and a pre-established structure baseline parameter to obtain a structure deviation parameter, and generating a protection state diagnosis result and corresponding link section identification information.

The invention provides a method and a system for eliminating a pulsating pressure interference peak in a pump source pipeline. A sparse interference peak filtering model for a pulsating pressure amplitude logarithmic spectrum is established by using a zero-phase filtering principle and a total variation filtering method, and then a pulsating pressure amplitude spectrum effective signal iterative calculation method is formed through a main minimization algorithm. The effective signal of the pulsating pressure can be extracted from the amplitude spectrum containing the sparse interference peak through iterative calculation, and the accuracy of a pulsating pressure signal measurement result is improved. In order to solve the problem of signal distortion of a result obtained by a total variation filtering model, the invention proposes to carry out secondary processing on the pulsating pressure obtained by the filtering model by using a moving least square method, so that the divergence problem of the extraction result of the filtering model is solved, and the reliability of a pulsating pressure filtering algorithm is enhanced.

The invention discloses an HAR microstructure morphology restoration method based on a modulation aberration data model, which avoids using expensive devices such as a deformable mirror to compensate aberration in the process of measuring a microstructure by near-infrared microscopic interferometry, avoids an aberration detection link, achieves transient response and accelerates the characterization process of a sample to be detected. On the basis of a BP neural network, a modulation aberration data network is constructed, errors are transmitted layer by layer through training, so that network parameters are corrected, a modulation aberration data model is constructed and optimized, required modulation aberration data are obtained through prediction according to characteristic parameters of a sample to be tested, a virtual phase filter is constructed, and accordingly aberration of an HAR microstructure interferogram is corrected. And finishing the morphology restoration of the HAR microstructure. The modulation aberration data model is continuously iterated and updated, accidental errors are avoided, and the robustness of the correction algorithm is higher.

The present application provides a direct detection method, apparatus and system for complex-valued double-sideband signals. In the embodiments of the present application, a frequency selective phase shifter is used to apply a single-side phase shift to the left sideband signal or the right sideband signal of the information-bearing signal. Thus, even if the frequency of the carrier signal drifts towards the side without phase shift relative to the frequency at the zero point of the phase filter, the detection result will not be affected. Therefore, it is not necessary to accurately align the operating wavelength of the transmitter laser (equivalent to the frequency of the carrier signal) with the wavelength at the phase mutation point of the phase filter (the frequency at the zero point of the phase filter), improving the tolerance to the carrier wavelength drift in complex-valued double-sideband signals. At the same time, since the frequency selective phase shifter applies a single-side phase shift instead of a double-side phase shift, the number of phase mutations to be completed is reduced from two to one, reducing the physical implementation difficulty of the frequency selective phase shifter and providing more options for the physical implementation of the frequency selective phase shifter.

The application discloses a high-arch dam modal parameter identification method under non-stationary working conditions. The method first arranges sensors on the high-arch dam to collect multi-channel vibration data, and removes non-stationary components in the signals based on a simple empirical Fourier decomposition method. Then, a parameter self-adaptive optimization multivariate modal decomposition method is used to process the data to obtain multi-channel intrinsic modal components. Finally, the random decrement method and Hilbert transform are combined for modal parameter identification, and the working modal parameters are output. The method effectively separates the non-stationary components by using the frequency cutoff strategy and the zero-phase filter, and realizes efficient and accurate decomposition of the multi-channel signals by using the correlation variance contribution rate fusion and the adaptive optimization algorithm. The method overcomes the shortcomings of the traditional method, such as insufficient interference processing of multi-channel data and lack of consideration of signal non-stationarity, and can more comprehensively and accurately identify the modal parameters of the high-arch dam, thereby providing reliable data support for the safety monitoring and stable operation of the high-arch dam.

The application discloses a distributed InSAR system atmospheric phase correction and deformation extraction method, belongs to the field of satellite image processing, and is characterized in that the method comprises the following steps: acquiring multi-satellite near-synchronous observation data of a distributed InSAR system to perform image registration; performing conjugate multiplication on the registered images to obtain interference phases; performing difference on the two interference phases to perform atmospheric phase correction; performing phase filtering processing on the interference phases after the atmospheric phase correction; performing phase unwrapping on the interference phases after the filtering processing; and performing geocoding processing to complete deformation extraction. Through near-synchronous imaging of multiple platforms on the same region, the generation path of time dimension interference is cut off from the physical layer, the influence of short-term atmospheric fluctuation on the phase is greatly weakened, noise and ambiguity in the phase unwrapping process are further removed in combination with the redundancy of multi-view observation of the distributed system, and high-precision extraction of the surface deformation field is realized.

The application provides a power line identification method, system, device and storage medium, and belongs to the technical field of power system detection. The method comprises the following steps: acquiring a to-be-detected image containing a power line; constructing a phase filter stretching kernel function based on a phase shift kernel function and a convolution theorem; inputting the to-be-detected image into the phase filter stretching kernel function, using the phase filter stretching kernel function to perform stretching transformation on the to-be-detected image, converting the to-be-detected image in the frequency domain into an angle image in the spatial domain, and extracting a contour edge in the angle image; superimposing the to-be-detected image and the angle image containing the contour edge to obtain a superimposed image, using relative total variation (RTV) to perform sharpening enhancement processing on the superimposed image, and identifying the power line. The application can improve the identification accuracy of the power line.