27 results about "Scattering function" patented technology

The invention discloses a high-frequency shallow water bottom reverberation signal modeling method, and belongs to the technical field of underwater acoustic engineering and signal processing. The method comprises the following steps: setting a modeling hypothesis; a cylindrical array geometric structure is constructed, scattering units are divided, and channel parameters and scattering functions are obtained in combination with a Bellhop tool and a GABIM model; generating a reverberation signal time domain expression, deducing an array receiving signal spatial domain expression and calculating a spatial spectrum; the model can also adjust underwater environment parameters to realize simulation under different conditions, and performs time domain and space domain theoretical analysis on reverberation signals based on a cylindrical array. Multi-dimensional underwater environment parameters are fused, and the modeling precision is improved; a receiving and transmitting combined cylindrical array is adapted, and spatial gain is embodied; experiments prove that the average error is within 3dB, the practicability is outstanding, support can be provided for design and optimization of the sonar system, and the method is suitable for underwater reverberation signal simulation and characteristic analysis of the sonar system in the high-frequency shallow water environment.

The present application is suitable for oil and gas geophysical exploration field, and provides a shale solid skeleton and organic matter elastic parameter synchronous prediction method, the method comprises the following steps: constructing a petrophysical model representing the elastic modulus of shale reservoir solid skeleton and the elastic modulus of organic matter; developing an inversion method in the well based on the petrophysical model; combining the petrophysical model and the scattering function theory, establishing a reflection coefficient formula linearly characterized by the elastic modulus of shale solid skeleton, the elastic modulus of organic matter and the density parameter; combining the reflection coefficient formula and the Bayesian linear inversion theory, developing a seismic petrophysical inversion method; applying synthetic seismic data, testing and verifying the effectiveness of the seismic petrophysical inversion method constructed in step E; then applied to actual seismic data, predicting the elastic modulus of shale gas reservoir solid skeleton and organic matter in the study area, providing an effective method for the brittleness evaluation of shale gas reservoir engineering sweet spot and the organic matter enrichment prediction of geological sweet spot.

The invention belongs to the technical field of signal processing, and discloses a distance-Doppler domain high-resolution parameter estimation method based on FrFT. Firstly, a target echo multi-bright-spot signal model is constructed, and then a corresponding replica signal set is constructed in combination with a transmitting signal and a to-be-detected target speed range; then selecting an optimal order, and performing fractional order Fourier transform on the received echo signal, the transmitted signal and the replica signal; constructing a distance Doppler fuzzy matrix according to a fractional order domain convolution theorem; an unconvolution integral model is established, and a Richardson-Lucy deconvolution iteration formula is deduced; and finally, solving a high-resolution target scattering function by using an R-L algorithm, and extracting target parameters for estimation. According to the method, the distance, speed resolution and parameter estimation performance of a traditional algorithm on the extended target can be improved, and robustness is achieved.

The present invention relates to a polyamide resin in which an average particle size of individual crystals measured by a small-angle X-ray scattering apparatus is 8.0 nm or less, and a UV-cut slope (dT / dλ) measured for a specimen having a thickness of 45 μm or more and 55 μm or less according to ASTM E424 is 0.25 or more in the range of 10% to 80% transmittance, and a polymer film and resin laminate using the same. In addition, the present invention relates to a polyamide resin with characteristic profile in which a small-angle X-ray scattering function obtained by irradiating the polyamide resin with X-rays having an energy of 10 KeV to 20 KeV using a small-angle X-ray scattering apparatus satisfies Equation 1 and Equation 2, and a polymer film and resin laminate using the same.

The utility model provides a myopia prevention and control lens, which relates to the technical field of optical lenses, and comprises a lens body, a first optical area and a second optical area, the second optical area is composed of a plurality of ring mirrors with diopters; the first optical area and the second optical area are arranged on the lens body; according to the utility model, the first optical area composed of a plurality of optical devices with a scattering function and the second optical area composed of a plurality of ring mirrors with diopter are arranged, so that multiple optical signal stimulation is provided for the eyes of a myopic patient, and the myopic eye mask is suitable for myopic crowds insensitive to single optical signals, and meanwhile, the myopic eye mask is suitable for myopic people. Due to the fact that the out-of-focus ring mirror can provide continuous out-of-focus signal stimulation, visual fatigue of a wearer can be relieved, and the myopia prevention and control effect is improved.

The invention relates to the technical field of diffractive optical elements, and discloses a four-point square diffractive optical element with a bottom stray light scattering function, the four-point square diffractive optical element comprises a laser head body and a four-point square diffractive optical element body, the surface of the laser head body is provided with a control panel, and the surface of the laser head body is in threaded connection with a head cover; the four-point square diffraction optical element body is arranged in the head cover, and by arranging the auxiliary device, when the four-point square diffraction optical element body is installed, after the head cover and the laser head body are installed, the pressing assembly can press the outer ring base, positioning is achieved, and damage to the optical element is reduced; the outer ring base is matched with the inner heat conduction ring to separate the four-point square diffractive optical element body from the head cover, meanwhile, the inner heat conduction ring can conduct heat on the four-point square diffractive optical element body, the head cover through hole, the protruding block penetrating hole and the flowing space form a through airflow path, external air can directly make contact with the inner heat conduction ring and take away heat, and effective heat dissipation is achieved.

The invention discloses a differential dynamic microscopic image processing method based on a root-mean-square error. The differential dynamic microscopic image processing method comprises the following steps: a sequence image acquisition step: acquiring a time sequence microscopic image; a sequence image processing step: obtaining a difference image data set; performing one-dimensional Fourier transform in two directions on the differential image data set in sequence to obtain two-dimensional transform result data, and calculating to obtain Fourier amplitude spectrum image data; an obtained data processing step: carrying out dimension reduction processing on the Fourier amplitude spectrum image data; introducing structure function fitting, calculating a root-mean-square error between a fitting curve of the data after dimension reduction processing and the Fourier amplitude spectrum image data, and selecting a data truncation point according to the root-mean-square error; and an intermediate scattering function is introduced, and dynamic information of Brown particles is obtained based on the relationship between the data after selection of the truncation point and the diffusion coefficient. According to the method, the data truncation point is determined through the root-mean-square error, so that the processing time is remarkably shortened while the measurement precision is ensured.

The application discloses an imaging domain least square migration method and device, electronic equipment and medium. The method can comprise: acquiring a global space-varying scattering function, interpolating and reconstructing the global space-varying scattering function to generate a plurality of scattering function data volumes; calculating the spatial deconvolution of the plurality of scattering function data volumes according to a depth domain imaging volume through an MPI parallel strategy to obtain corresponding least square migration images; and reducing the least square migration images corresponding to the plurality of scattering function data volumes to obtain a final imaging result. The application encrypts the point spread function through the interpolation and reconstruction strategy, and further deconvolves the reconstruction to suppress discontinuous noise through multiple superimpositions to obtain higher imaging accuracy.

The application relates to a chemical short-range order measurement method and system based on an atomic pair distribution function, and the method comprises the following steps: performing a total scattering experiment on a polycrystalline powder sample to obtain total scattering data, a scattering function and an atomic pair distribution function; based on the total scattering data, an initial three-dimensional atomic structure model is constructed; further, the initial three-dimensional atomic structure model is fitted and reconstructed by taking minimization of a fitting goodness factor as a target, so that a three-dimensional atomic structure model after fitting and reconstruction is obtained; according to the three-dimensional atomic structure model after fitting and reconstruction, a radial distribution function and a bulk average distribution concentration are calculated, and a chemical short-range order parameter calculation cutoff is set according to a near-neighbor atomic cutoff distance; further, the probability of an atom finding other types of atoms under the calculation cutoff is calculated; and the chemical short-range order parameter is calculated based on the probability and the bulk average distribution concentration. Compared with the prior art, the application has the advantage of wide application scenarios.

The present application relates to a kind of multi-dimension gradual scattering light guide plate, processing method and backlight plate, and the light guide plate includes substrate layer and scattering function layer.Substrate layer and scattering function layer are closely adhered, and substrate layer and scattering function layer are respectively made of different light-transmitting material composite;Scattering structure is gradually distributed along at least two dimensions on the light guide plate, scattering structure penetrates substrate layer and scattering function layer, scattering structure is misaligned arrangement in adjacent column in plane, and misalignment amount is 1 / 2-2 / 3 of column spacing;Light guide plate includes light inlet end and light outlet end, in the direction of light outlet end towards light inlet end, the distribution density of scattering structure gradually increases, in the direction of substrate layer towards scattering function layer, the size of scattering structure gradually decreases.Scattering structure gradually increases along light inlet end to light outlet end density, gradually decreases along substrate layer to scattering function layer size, and misaligned arrangement in adjacent column spacing in plane, it is favorable to eliminate bright and dark stripe, let light emitting surface brightness distribution be more uniform.

This invention relates to the field of shortwave antenna communication channel testing and modeling technology, specifically to a method for measuring the angular power spectrum of an antenna in a shortwave skywave scenario. The method includes: the receiver performing a two-dimensional equally spaced angular scan within a preset azimuth and elevation range; establishing an angular power spectrum measurement equation based on the received signal power, antenna pattern, and noise power channel, using the scattering function; convolving this equation with the pattern to obtain the angular power spectrum within a single path; discretizing the single-path received power matrix and antenna pattern matrix in two dimensions, and then performing zero-plugging expansion on each; converting the discretized single-path received power matrix and antenna pattern matrix into two-dimensional frequency domain matrices, and determining the frequency domain ratio between the received power matrix and the antenna pattern matrix mapped to the angular domain using time-delay Doppler domain parameters. This invention improves the accuracy of angular power spectrum measurement in shortwave skywave channels while reducing the dependence of traditional empirical modeling methods on a single propagation assumption.

The application discloses a hyperspectral backscattering function and scattering coefficient measuring device, and belongs to the technical field of backscattering function measuring devices. The device comprises a light source. The light emitted by the light source is divided into two beams of collimated light through a one-to-two optical fiber jumper wire. One beam of collimated light is introduced into a reference light flux detector through a first optical fiber. The other beam of collimated light enters a first optical window through a second optical fiber and irradiates a scattering body in a sample cell. The scattered light generated after scattering by the scattering body is introduced through a second optical window and transmitted to a scattering flux detector through a third optical fiber. The scattering flux detector is used for receiving the scattered light from the scattering body and performing spectral spectroscopy and array detection on the scattered light. The reference light flux detector is used for receiving the light flux from the light source introduced through the first optical fiber and performing spectral spectroscopy and array detection on the light flux. The application solves the problem that the existing water backscattering function and scattering coefficient measuring device can only detect the backscattering coefficient of water at several wavelengths.

The invention is suitable for the technical field of oil and gas geophysical exploration, and provides a shale geology and engineering double-dessert synchronous prediction method and system, and the method comprises the following steps: constructing a rock physical model which represents a shale skeleton brittleness index, a solid skeleton volume modulus and an organic matter elastic modulus; on the basis of the rock physical model, developing an in-well rock physical inversion method, and predicting a skeleton brittleness index, a solid skeleton volume modulus and an organic matter elastic modulus by using logging data; establishing a reflection coefficient formula by combining a rock physical model based on a scattering function theory; based on a Bayesian inversion framework and a multi-data assimilation set inversion method, in combination with a reflection coefficient formula, a pre-stack seismic inversion method is developed, and the above parameters are synchronously predicted by using pre-stack seismic data. According to the method, a new effective method can be provided for simultaneous prediction of organic matter enrichment characterization of geological sweet spots of shale gas reservoirs and brittleness evaluation of engineering sweet spots.

The application provides a particle backscattering coefficient acquisition method and device, a storage medium and a terminal, wherein the method comprises the following steps: acquiring wide-angle VSF data of a target sea area, and acquiring corresponding backscattering full-angle volume scattering function data of the wide-angle VSF data by using an interpolation algorithm; acquiring corresponding backscattering distribution curves based on the backscattering full-angle volume scattering function data; extracting a plurality of corresponding angle values from a first interval, a second interval, a third interval and a fourth interval at a preset interval respectively, and arranging and combining all the angle values to acquire a plurality of different preset angle combinations; performing polynomial fitting based on each preset angle combination to acquire an estimated backscattering coefficient fitting model corresponding to the backscattering distribution curves; and inputting the backscattering full-angle volume scattering function data into the estimated backscattering coefficient fitting model for calculation to acquire a particle backscattering coefficient result. The application can improve the accuracy of acquiring the particle backscattering coefficient.

The embodiment of the utility model provides a metering detection device with an anti-tilting function, which relates to the technical field of metering detection equipment and comprises a metering box, a positioning unit is arranged at the lower end in the metering box and comprises a fixed disc fixedly mounted at the bottom of the metering box and positioning feet arranged at the upper end of the fixed disc, and the positioning feet are arranged on the fixed disc. The positioning feet are movably installed at the upper end of the fixing disc, the adjusting screw rod is installed at the upper end of the fixing disc and penetrates through the positioning feet, and when liquid needs to be added into the metering cup, the driving motor can drive the second bevel gear installed at the lower end to rotate, and then the first bevel gear installed on one side in a meshed mode is driven to rotate; and then the adjusting screw rod fixedly installed on one side rotates to drive the positioning feet installed at the upper end in a threaded mode to synchronously stretch or contract, then centering clamping can be conducted on the metering cup movably installed in the middle, quantitative materials can be conveniently injected into a feeding device at the upper end, and the metering cup is prevented from being placed in an offset mode.

The application discloses a kind of based on super surface's radiation scattering integrated antenna structure, including the basic structure unit of two layers of dielectric layer and three layers of metal layer, dielectric layer is by first dielectric layer and second dielectric layer from top to bottom distribution;Metal layer is from top to bottom respectively the super surface scattering and radiation layer of first metal layer, the copper column layer and direct current bias layer of second metal layer, the metal ground layer of third metal layer;The super surface scattering and radiation layer has scattering function and radiation function, copper column layer and direct current bias layer provide voltage difference and excitation for super surface;Metal ground layer is as the floor layer of entire antenna;Super surface is by n×n basic structure unit copy translation composition.The application can let RCS under the irradiation of different incident waves realize the effect of reduction.The radiation and scattering characteristics of the proposed digital metasurface array are independent of each other and can be flexibly controlled respectively.

The invention discloses an optical synergistic adhesive film as well as a preparation method and application thereof. The optical synergistic adhesive film comprises a first light scattering function layer, a light storage function layer and a second light scattering function layer, the two faces of the light storage function layer make contact with the first light scattering function layer and the second light scattering function layer respectively, the first light scattering function layer comprises first matrix resin and first light scattering particles, and the second light scattering function layer comprises second matrix resin and second light scattering particles. The second light scattering functional layer comprises second matrix resin and second light scattering particles, and the light storage functional layer comprises third matrix resin and a long afterglow luminescent material. The light-emitting duration of the optical synergistic adhesive film and the power increment and the actual power generation increment of the photovoltaic module are effectively improved.

The invention discloses a method and device for measuring a complex scattering function of a radar target, and relates to the field of microwave stealth technology and active microwave remote sensing, and the method comprises the steps: constructing a generalized radar equation represented by a complex voltage for a radar detection target; according to the generalized radar equation, fitting to obtain a relation curve of the amplitude and the distance of the complex scattering function and a relation curve of the phase and the distance; performing low-pass filtering processing on the relation curve of the amplitude and the distance and the relation curve of the phase and the distance; and for the relation curve of the amplitude and the distance after filtering and the relation curve of the phase and the distance after filtering, obtaining the amplitude and the phase of the complex scattering function at the infinite far field by adopting a polynomial fitting and limit taking method. According to the invention, the method can directly and accurately measure the complex scattering function of any small to-be-measured target (including a standard device), and does not need an RCS standard device with a known standard value in the measurement process.

The utility model discloses a multispectral water body attenuation and forward small-angle scattering measurement device, which is characterized by comprising a light source, a scatterer and a water body attenuation and forward scattering luminous flux detection module, wherein the light source comprises N collimation lasers and a laser output gating module; each collimating laser is transmitted or reflected by the laser output gating module after being subjected to electric control time-sharing gating, and then outputs a single-wavelength collimating working light source in a time-sharing manner; the single-wavelength collimation working light source is scattered by the scatterer to form scattered light in different directions; the water body attenuation and forward scattering luminous flux detection module comprises a scattered light receiving and converging hyperbolic convex lens, an optical filter and an area array CCD (Charge Coupled Device); scattered light is collimated and converged to a radial optical filter through a scattered light receiving and converging hyperbolic convex lens, and scattered light signals are attenuated by the optical filter according to the attenuation amount of the radial optical filter in proportion and then are incident to a photosensitive element of the area array CCD. According to the utility model, measurement of multi-wavelength multi-angle forward small-angle volume scattering functions is realized.

This invention relates to shortwave communication technology, and particularly to a shortwave MIMO channel modeling method based on multi-domain coordination of time-space-frequency-polarization-angle. The method includes: constructing a nonlinear array of transceiver antennas; determining the geometric relationships of element spacing, element velocity, distance from the reflector cluster to the antenna, and reflector cluster velocity based on three-dimensional vectors; establishing a path transmission delay characterization mechanism jointly determined by propagation distance, the number of inseparable multipath paths, and time-difference statistical characteristics; decomposing the distance from the element to the reflector cluster into time-space stationary and non-stationary terms; establishing a polarization matrix and performing amplitude-phase weighting on multipath components with different arrival and departure angles; obtaining the existence and disappearance states of the path over time based on the reflector cluster probability model combined with Markov processes; incorporating the influence of antenna polarization on channel amplitude into the channel expression; and generating impulse response and corresponding scattering functions using the obtained angular power spectrum, delay domain model, and time-varying path state model. This invention improves the polarization adaptability of large-scale arrays to actual arrays.

The invention relates to a chemical short-distance ordered measurement method and system based on an atom pair distribution function, and the method comprises the steps: carrying out a total scattering experiment on a polycrystalline powder sample, and obtaining total scattering data, a scattering function and the atom pair distribution function; constructing an initial three-dimensional atomic structure model based on the total scattering data; further performing fitting reconstruction on the initial three-dimensional atomic structure model by taking minimization of the fitting high-quality factor as a target to obtain a three-dimensional atomic structure model after fitting reconstruction; according to the fitted and reconstructed three-dimensional atomic structure model, calculating a radial distribution function and a volume phase average distribution concentration, and setting chemical short-range ordered parameters according to a neighbor atom truncation distance to calculate truncation; further calculating the probability of finding other types of atoms under the calculation truncation of the atoms; and calculating a chemical short-range order parameter based on the probability and the volume phase average distribution concentration. Compared with the prior art, the method has the advantage of wide application scenes.

The application specifically relates to a deep-sea reverberation suppression method based on a generalized spatial filtering principle, which comprises the following steps: constructing a three-dimensional scattering function based on an incident grazing angle, a scattering grazing angle and a scattering azimuth angle; constructing seabed reverberation intensity received from a scatterer based on the three-dimensional scattering function; determining a peak moment of the reverberation intensity based on the attenuation characteristics of the seabed reverberation intensity; selecting a reverberation acoustic line at the peak moment and a target echo acoustic line, constructing an array reverberation copy vector according to the reverberation acoustic line, and constructing a target echo copy vector according to the target echo acoustic line; constructing a second-order cone programming model based on the reverberation copy vector and the echo copy vector, and solving the second-order cone programming model to obtain a generalized spatial filtering matrix; and suppressing the array reverberation signal by using the generalized spatial filtering matrix. The application considers the change of the reverberation characteristics caused by the uncertainty of the real marine environment, and has good robustness for the reverberation suppression method in the fluctuating deep-sea environment.

The invention relates to the related technical field of monitoring and testing signals in a wireless communication system, in particular to a midspan latitudinal slot short-wave communication channel modeling method based on ionosphere model reconstruction, which comprises the following steps: acquiring punctuation data, and carrying out ionosphere gridding processing on the punctuation data; filling the punctuation data into a corresponding grid in the ionized layer grid chart; carrying out grid data stacking to obtain 3D ionized layer grid parameters; carrying out channel connectivity rate analysis by adopting a ray tracing technology, and calculating signal propagation parameters; the method comprises the following steps: fitting signal propagation parameters by adopting Nakagami-m distribution, and constructing a time delay power spectrum function; describing a frequency spectrum type corresponding to the time delay power spectrum function according to the ionosphere condition, and constructing a scattering function; according to the mid-latitude slot crossing short-wave communication channel modeling method designed by the invention, the problems of relatively low connectivity rate and high calculation complexity of short-wave signals transmitted across mid-latitude slots at night are solved, the communication reliability is relatively high, and the use limitation on regions is relatively small.

The application discloses a global space-varying scattering function calculation method and device, electronic equipment and medium. The method can include: establishing a scattering point model; according to the velocity model and the real-time scattering point model, performing three-dimensional seismic wave field simulation on the two-way wave equation and its inverse migration equation to obtain inverse migration data; and according to the velocity model and the inverse migration data, performing reverse-time migration to obtain the global space-varying scattering function. The application performs sparse optimization sampling on the scattering point model, avoids interference of wave fields of adjacent scattering points while ensuring the density of point scattering functions, realizes efficient calculation of the global space-varying scattering function by using the calculation cost of the space-invariant scattering function, and finally provides an accurate and effective Hessian approximation operator to promote the practicalization process of the imaging domain least square reverse-time migration.

The invention belongs to the technical field of data processing, and particularly relates to a forest region microwave remote sensing earth surface dead combustible moisture content monitoring method and system, and the method comprises the steps: building a soil background scattering prediction model through historical time sequence data, and obtaining a soil background scattering coefficient in a current environment; constructing a dielectric and energy coupling balance equation considering the two-way attenuation effect, and introducing a moisture impedance attenuation function and a moisture gain scattering function; and constructing a residual target function according to the total backscattering coefficient observed by the satellite and the soil background scattering coefficient, and inverting the moisture content of the dead combustible matters on the earth surface by using a constrained interval search algorithm. According to the method, the soil background and dead combustible signals are decoupled, the problem that a traditional linear addition model loses efficacy in a humid environment is solved, and accurate monitoring of the moisture content of the earth surface dead combustible under the complex hydrothermal condition is achieved.

A method for dynamic modeling and manipulation of multi-object scenes is described. The method includes using object-centric neural implicit scattering functions (OSFs) as object representations in a model-predictive control (MPC) framework for the multi-object scenes. The method also includes modeling a per-object light transport to enable compositional scene re-rendering under object rearrangement and varying lighting conditions. The method further includes applying inverse parameter estimation and graph neural network (GNN) dynamics models to estimate initial object poses and a light position in the multi-object scene. The method also includes manipulating an object perceived in the multi-object scene according to the applying of the inverse parameter estimation and the GNN dynamics models.