23 results about "Phase resolution" patented technology

The invention relates to the technical field of electromagnetics, in particular to an ultra-wideband full-polarization large-angle beam scanning theory based on an electromagnetic metasurface, which comprises the following steps of: S1, regulating and controlling a beam far-field phase based on an array global reference phase; s2, adjusting and controlling far-field orthogonal polarization vector field superposition based on array factors to realize full-polarization beam control; and S3, theoretical calculation verification of full-polarization beam regulation and full-wave simulation verification of the full-polarization beam. According to the invention, a novel full-polarization wave beam regulation and control theory based on array factor regulation and control orthogonal polarization vector field superposition is provided, and theoretical calculation and full-wave simulation are carried out on the provided full-polarization wave beam regulation and control theory; according to the theory, the effectiveness and universality of realizing ultra-wideband and large-angle full-polarization beam regulation and control by only using one-bit phase resolution are verified.

The system comprises a projection module, an imaging module and a phase resolving module, the projection module comprises at least three light source units and light modulation units corresponding to the light source units, an emergent light path of at least one light source unit is provided with an optical coupling assembly, and the emergent light path of at least one light source unit is provided with an optical coupling assembly. The light modulation unit is used for carrying out gradient phase modulation on a light beam, and the optical coupling assembly couples a light path modulated by the light modulation unit to a coaxial light path of the imaging module; the imaging module is arranged on a path sharing the same optical axis with the optical coupling assembly and is used for acquiring a stripe image modulated on the surface of the measured object; the phase resolving module is used for solving a wrapping phase of the fringe image output by the imaging module and unwrapping the wrapping phase based on a quality image guided space phase unwrapping algorithm; while the high-frequency sine fringe generation capability is ensured, collaborative optimization of phase distribution and light intensity characteristics is realized, and the contradiction between device miniaturization and optical performance is effectively reconciled.

A row-column ultrasound transducer array is controlled to perform excitation in the azimuth dimension with two sets of excitation signals in quadrature. The two sets of excitation signals are delivered such that adjacent transducer elements are simultaneously provided excitation signals in quadrature, or such that transmit events occur temporally in series for synthetic imaging, with each transmit event being generated using a respective set of excitation signals. Separate bias apertures are applied in the bias (elevation) direction for each set of excitation signals, such that elements driven according to one set of excitation signals are biased, in the elevation direction, according to one bias aperture, and the elements driven with quadrature excitation signals are biased according to another bias aperture. The bias apertures are selected such that their combination results in the generation of a Fresnel aperture with fine and controllable phase resolution beyond that of a conventional row-column transducer.

The invention discloses a phase deflection measurement method and device based on four-step phase shift, and belongs to the technical field of computer vision and precision measurement, and the method comprises the steps: S1, classifying patterns needing to be projected according to types, and fusing the patterns into a color image; s2, sequentially projecting color images, and simultaneously collecting a pattern modulated and reflected by an object to be measured to obtain a reflection pattern; s3, carrying out channel separation processing on the reflection pattern, recovering the reflection pattern into an original grey-scale map, and respectively obtaining all phase patterns and Gray code patterns in the horizontal direction and the vertical direction; s4, performing phase calculation and Gray code auxiliary positioning according to the phase pattern and the Gray code pattern to obtain an absolute phase; and S5, mapping the absolute phase into a depth value, and recovering the three-dimensional shape of the surface of the object to be measured in combination with calibration parameters of a camera-projection system. The time of each measurement period is shortened, the system delay in the projection and acquisition process is reduced, and the real-time response capability of the whole set of detection system is improved.

The invention discloses a cable partial discharge mode identification method and device based on multi-mode fusion, electronic equipment and a storage medium, and belongs to the technical field of cable partial discharge online monitoring. And converting the original signal into a multi-modal spectrum through phase resolution analysis, wavelet packet energy analysis, skewness and kurtosis statistics and recurrence plot analysis. The group of maps are input into a multi-modal fusion recognition model, the model analyzes the spatial distribution characteristics and the time sequence characteristics of the maps at the same time through parallel vision and time sequence coding modules, and two analysis results are subjected to weighted fusion, so that final classification recognition of the discharge mode is realized. Through the implementation of the method and the device, the problems that key information is lost due to dependence on single-dimensional feature representation and the identification accuracy is limited due to the fact that an existing identification model cannot analyze the spatial distribution characteristic and the time sequence evolution characteristic of the signal at the same time in the prior art can be solved.

The invention discloses a cross-resolution remote sensing image change detection method based on resolution difference perception. Firstly, a pseudo-image sequence with smooth resolution transition is constructed, spatial-temporal feature extraction with continuous resolution transition is realized by using pseudo-resolution guide feature fusion, and the problem that ground feature features are difficult to extract due to large spatial detail difference between high-resolution and low-resolution images is solved. On the basis, the resolution difference of the double-time-phase images is embedded into model learning, and key features of the changing ground objects in the images with different resolutions are enhanced by designing a double-time-phase resolution difference modulation module, so that the model is helped to better identify the changing ground objects, and the detection performance is improved.

This invention provides a phase correction circuit, an energy metering device, and a corresponding method thereof. The phase correction circuit provided in this embodiment includes: a first delay module for receiving at least two input signals with asynchronous phases, and obtaining a first delayed signal by performing a first delay of M sampling intervals on the phase-leading signal based on a first phase difference between a phase-leading signal and a phase-lag signal among the at least two input signals; and a second delay module for performing a second delay of less than one sampling interval on the first delayed signal based on a second phase difference between the first delayed signal and the phase-lag signal; wherein M is a positive integer greater than or equal to 1, and the second delayed signal is phase-synchronized with the phase-lag signal. Using this invention not only enables more accurate and faster phase correction, but also simplifies the circuit design, ensuring high phase resolution without occupying a large circuit area.

The present invention discloses a carrier demodulation method based on eliminating the influence of modulation depth by third harmonics. The method uses a modulation depth elimination module to eliminate the influence of light intensity disturbance and modulation depth drift by performing operations such as subtraction, self-differentiation multiplication, and division on the sine and cosine components after frequency mixing and filtering, followed by single, double, and triple frequency multiplication. After the phase resolution module performs power reduction operations and sign judgment, the phase to be resolved can be accurately calculated, and the modulation depth value of the current system can be accurately calculated by the modulation depth resolution module. The present invention can eliminate the influence of the modulation depth of the external carrier on the demodulated signal, and can also eliminate the influence of light intensity disturbance on the demodulated signal, so that the demodulation result has a high signal-to-noise ratio and low harmonic distortion, thereby improving the accuracy of signal amplitude detection and the stability of the demodulation system. It can be widely used in high-precision optical fiber measurement and sensing systems.

The invention discloses an atlas processing method and device based on a semantic segmentation technology, and the method comprises the steps: obtaining a to-be-recognized atlas which is a phase resolution partial discharge atlas; processing the to-be-identified atlas according to a pre-constructed semantic segmentation model to obtain a dichotomy result of the to-be-identified atlas, the dichotomy result being used for indicating partial discharge pixels and background pixels of the to-be-identified atlas, the partial discharge pixels being pixels corresponding to partial discharge signals in the to-be-identified atlas, and the background pixels being pixels corresponding to the partial discharge signals in the to-be-identified atlas; the background pixels are pixels except the partial discharge pixels in the atlas to be identified; according to the dichotomy result, background pixels and partial discharge pixels of the to-be-recognized atlas are processed according to background colors and partial discharge pixel rendering modes of standard atlas contained in a standard recognition database to obtain processed to-be-recognized atlas, the processed to-be-recognized atlas and the standard atlas have the same atlas format, and the processed to-be-recognized atlas and the standard atlas have the same atlas format. The processed to-be-identified map is used for identifying the partial discharge type. According to the scheme, the domain offset problem of the PRPD atlas to be recognized can be solved by utilizing the semantic segmentation model.

The invention belongs to the technical field of image processing. The invention provides an OCTA image processing method and system based on intensity phase fusion, and the method comprises the steps: carrying out the split spectrum processing of OCTA data, and obtaining a plurality of sub-band signals; for any sub-band signal, performing time domain phase correction and frequency domain phase correction on each frame of OCTA image according to an inter-frame error between the current frame of OCTA image and the previous frame of OCTA image, and determining an intensity difference image and a phase difference image of the current frame of OCTA image and the previous frame of OCTA image according to a frequency domain correction result; further obtaining an intensity phase fusion image of the current frame OCTA image; and overlapping the intensity phase fusion images corresponding to the OCTA images of the frames of the sub-band signals to obtain a fused OCTA image. According to the method, jumping errors in a motion area can be avoided, meanwhile, the phase resolution of a static area is not sacrificed, and the OCTA image correction precision is improved.

The present invention discloses a communication and ranging integrated target displacement measurement method based on a heterodyne interference system, which mainly solves the problem of low ranging accuracy in the prior art. The solution is as follows: A communication and ranging integrated light beam is generated by a frequency-stabilized laser, and is divided into a reference-end light beam and a measurement-end light beam by a beam splitter prism; the reference-end light beam undergoes interference through a reference polarizer and is converted into a reference-end electrical signal by a photoelectric converter; the measurement-end light beam is divided into two light beams with different frequencies by a polarization beam splitter prism, and then is reflected by a reference corner reflector and a measurement corner reflector respectively onto a measurement polarizer to undergo interference, and is converted into a measurement-end electrical signal by a photoelectric converter; the electrical signals at the reference end and the measurement end are subjected to phase resolution to obtain two sine and cosine signals; the integer and fractional parts of the phase are calculated using these two signals, and then the relative displacement of the object is calculated through the phase. The present invention greatly improves the ranging accuracy and can be used for satellite communication and ranging integration.

The application discloses a power cable partial discharge enhanced spectrum construction and small sample recognition method, and belongs to the technical field of power cable diagnosis and detection. The method first acquires a partial discharge phase resolution spectrum, and divides the spectrum into laboratory and field sample sets according to discharge types and collection scenes. After standardization processing of the spectrum, phase and amplitude distribution characteristics are extracted to construct a multi-channel enhanced spectrum. Small sample amplification is completed under the constraint of physical distribution rules, and then stable structure characteristics of the two types of samples are aligned. Finally, the processed samples are input into a recognition model, and discharge recognition results are output. The application can improve spectrum distinguishability, alleviate small sample overfitting problems, reduce cross-scene sample distribution deviation, enhance model generalization capability, and is suitable for multi-type power cable partial discharge defect recognition.

The invention discloses a code sequence generation method based on non-integer multiple sampling and hardware implementation, which overcome the problem that the rising edge of the traditional 1-bit pseudo-random code sequence is too large in jitter by combining template convolution multiplexing, table look-up splicing and non-integer multiple sampling rate conversion technologies, remarkably improve the phase resolution of the code sequence generation, and improve the generation efficiency of the code sequence. The method is suitable for the fields of high-precision ranging systems, time synchronization systems, radar signal modulation and the like.

The present invention discloses an eight-phase output phase interpolator, which belongs to the field of analog integrated circuit design technology, and includes: a frequency divider, an input buffer, a CMOS-to-CML circuit, a digital decoder, a first phase interpolation core, a second phase interpolation core, a limiter, a phase blender and a CML-to-CMOS circuit. The present invention adopts a phase interpolation structure, and two phase interpolation cores, an odd-path and an even-path, respectively interpolate the four-phase orthogonal CML signals. The two output signals differ by 45°, and the phase deviation introduced in its linear interpolation structure presents a characteristic of opposite directions between the two paths. By fusing the two output signals through the phase blender, the nonlinear error in the single-path structure is effectively offset, the linearity of the overall interpolation output is improved, the INL of the interpolator is significantly reduced, and the phase resolution and accuracy of the multi-phase clock system are improved.

The application relates to a transformer fault identification method, and belongs to the technical field of power system equipment fault diagnosis. The method comprises the following steps: an acoustic feature library containing multiple transformer fault types is established; an acoustic signal of a transformer is collected to generate a real-time phase resolution spectrum of the acoustic signal; the real-time phase resolution spectrum is compared with the acoustic feature library through an SVM model; and a diagnosis result is output based on the comparison result and a fault response action is performed. The transformer fault identification method provided by the application compares the real-time phase resolution spectrum of the acoustic signal with the acoustic feature library, and realizes rapid and accurate identification of transformer faults.

The application discloses a cost-controlled phased resolution generation and cache reuse system and method applied to the field of computer technology, which firstly performs rapid preliminary screening at a low resolution level, and removes candidate configurations which are obviously unreasonable in physical structure or whose energy significantly deviates from a threshold; then gradually improves the resolution of the configurations, introduces a physical constraint and an energy calculation model, and gradually approaches a high-fidelity simulation result; meanwhile, a structure feature cache mechanism is arranged at each resolution level, intermediate states and energy gradient information of the calculated configurations are standardized stored and indexed, and are called at a higher resolution level for subsequent same or similar configurations, so that repeated calculation is avoided; finally, through a resolution transition determination module, whether to enter a next resolution level or terminate calculation is dynamically decided according to an energy convergence trend of the current configuration, a structure stability index and a calculation resource budget, so that an optimal balance between physical rationality and calculation efficiency is realized in a global range.

The present invention belongs to the field of image processing technology. Provided is an OCTA image processing method and system based on intensity phase fusion, which performs split spectrum processing on OCTA data to obtain multiple sub-band signals; for any sub-band signal, based on the inter-frame error between the current frame OCTA image and the previous frame OCTA image, performs time domain phase correction and frequency domain phase correction on each frame OCTA image; based on the results of the frequency domain correction, determines the intensity difference image and phase difference image between the current frame OCTA image and the previous frame OCTA image, and then obtains an intensity phase fusion image of the current frame OCTA image; superimposes the intensity phase fusion images corresponding to each frame OCTA image of each sub-band signal to obtain a fused OCTA image. The present invention can avoid jump errors in moving areas without sacrificing the phase resolution of static areas, thereby improving the accuracy of OCTA image correction.

A dual-scan high-precision ranging method based on distance spectrum signal reconstruction belongs to the field of laser interferometry ranging. The present invention addresses the problem of reduced signal-to-noise ratio caused by multiplying interference signals in order to offset Doppler frequency shift in the dual-scan frequency-interference ranging method. It includes: based on the dual-scan FMCW structure, first obtaining the auxiliary and measurement interference signals corresponding to the up-scan and down-scan lasers, then performing phase resolution on the auxiliary interference signals, and obtaining the distance spectrum containing Doppler information through NUDFT respectively; then indexing the range of the distance spectrum containing only Doppler information, and using the indexed distance spectrum information to construct interference measurement signals based on the DSR algorithm that have eliminated the noise introduced by nonlinear broadening, and finally multiplying the reconstructed measurement signal and performing NUDFT with the auxiliary signal after multiplication to obtain high-precision distance information. The present invention is used for high-precision ranging.

The present invention discloses an antenna array and a phase resolution method adapted to high-precision angle measurement with an ultra-wide field of view, belonging to the technical field of antenna measurement. A plurality of antennas are arranged on three circular arrays with different radii, forming three independent and symmetric measurement baselines. The difference between the radii of the two smaller circular arrays is less than half of the wavelength of the incident wave, and the sum of the diameters of the two smaller circular arrays is greater than the diameter of the largest circular array. Based on the above antenna array, the present invention proposes a phase resolution method to achieve angle measurement in a wide field of view and greatly simplifies the phase ambiguity resolution operation.

The invention discloses a partial discharge fault assessment method and device, an electronic device and a storage medium, multi-dimensional sensing signals are synchronously collected, time alignment and amplitude normalization processing are carried out, a phase resolution partial discharge spectrogram containing deep structure information is generated, two-dimensional features of discharge density distribution and contour form are extracted from the phase resolution partial discharge spectrogram, and a partial discharge fault assessment result is obtained. The method does not only depend on few statistical characteristics; and then the fault type and confidence are judged by fusing features and an intelligent recognition model in combination with a soft scoring mechanism, and the fault level is judged by calculating a comprehensive fault index in combination with a parameter deviation degree, so that the limitation of artificial experience interpretation is eliminated, deep information in a spectrogram is fully mined, and the fault diagnosis accuracy is improved. The technical effects of enhancing feature expression capability, improving complex fault mode identification accuracy, realizing accurate judgment of fault types and grades, and improving reliability of electrical switch cabinet insulation state evaluation are achieved.

The application discloses an IRS configuration optimization and AoI scheduling optimization method in a UAV-IRS assisted IoT network, which is applied to a UAV with an IRS, and the UAV corresponds to multiple IoT devices, and the method comprises the following steps: acquiring current position information of the UAV; determining an optimal moving direction according to the current position information and a pre-trained Q table; moving to a next position information along the optimal moving direction; determining a reflection phase shift matrix of the IRS by a combinatorial optimization method according to the number of surface elements of the IRS, a preset phase resolution and a signal amplitude of the IRS at the next position information; determining a signal-to-noise ratio of each corresponding IoT device based on the reflection phase shift matrix at the next position information; when the signal-to-noise ratio of each corresponding IoT device is greater than or equal to a preset threshold, acquiring an AoI of each corresponding IoT device in a current time slot, inputting the AoI into a pre-trained DQN model, and outputting an IoT device to be relayed in the current time slot; and sending information sent by the IoT device to be relayed to a base station.

The invention discloses a partial discharge mode identification method based on ultrahigh frequency signal phase independent characteristics. The method comprises the following steps: generating a phase resolution partial discharge map; obtaining a pre-processing phase resolution partial discharge map with a uniform size; forming a phase-independent composite feature vector; obtaining a low-redundancy phase-independent discrimination feature vector; establishing a corresponding discriminant energy potential function set after the discriminant diffusion matrix is stabilized, and forming a discriminant energy potential function model; and determining a partial discharge mode to which the partial discharge sample to be detected belongs according to a minimum discriminant energy criterion, and outputting a partial discharge mode identification result. According to the method, the interference of noise features and weak discrimination features on the model can be remarkably reduced through adaptive dimensionality reduction, and the stability and robustness of the discrimination model under small sample and short-time monitoring conditions are improved.

The invention provides a phase resolution partial discharge map processing method and a related device, and relates to the field of image processing, and the method comprises the steps: obtaining a binary map of a PRPD map; the distribution statistical characteristics of each row of pixels in the vertical coordinate direction and the distribution statistical characteristics of each column of pixels in the horizontal coordinate direction in the binary map are obtained, and the distribution statistical characteristics of each row of pixels in the vertical coordinate direction are used for indicating the distribution condition of each row of pixels in the phase; the distribution statistical characteristics of each column of pixels in the horizontal coordinate direction are used for indicating the amplitude range of each column of pixels; according to preset distribution statistical characteristics of noise pixels, the distribution statistical characteristics of each row of pixels in the vertical coordinate direction and the distribution statistical characteristics of each column of pixels in the horizontal coordinate direction, identifying the noise pixels in the binary map; according to the method, the interference pixels in the binary map are identified according to the preset distribution statistical characteristics of the interference pixels, so that the problem of curse of dimensionality is avoided, and the accuracy and the robust performance are improved.