27 results about "Spherical array" patented technology

The invention relates to a uniform spherical array time domain sound source localization method based on a neural network, and belongs to the technical field of sound source localization. The method comprises the following steps: constructing a uniform spherical microphone array, and arranging microphones on a spherical surface by adopting a golden angle distribution strategy; collecting a multi-channel time domain audio signal; a time domain signal is input to a deep regression neural network, the network comprises a time domain encoder, a Transform encoder and a full connection layer, and continuous coordinates of a sound source in a three-dimensional space are directly output. According to the method, frequency domain conversion and space grid division are avoided, the positioning precision, the calculation efficiency and the three-dimensional full-space applicability are improved, and the method is suitable for real-time sound source positioning in a complex acoustic environment.

The application provides an air conditioner production line abnormal sound detection method and system, comprising: acquiring sound signals in real time through a microphone spherical array; processing the sound signals based on an HOA-SHT domain analysis framework to generate a panorama sound image; acquiring an air conditioner image through a panorama camera; locking an air conditioner area according to the air conditioner image; performing multi-modal positioning on the air conditioner area through the panorama sound image to obtain a target area; extracting sound signals from the target area through a multi-scale mel spectrum, and inputting the extracted sound signals into a beamformer of a neural network to obtain noise signals; detecting and identifying the noise signals based on a convolutional neural network-based anomaly classifier to obtain air conditioner abnormal sound classification results; efficiently and accurately detecting air conditioner hanging machine abnormal sounds, effectively overcoming the limitations of traditional manual detection methods, significantly improving production efficiency, reducing the false detection rate and the missed detection rate, and providing strong quality guarantee for the production line.

This invention belongs to the field of spherical array layout design, and discloses a broadband high-gain spherical array layout method based on co-frame design, according to the upper limit f of the operating frequency of the closely packed spherical array. max Calculate the approximate element spacing d0 = (c / f max Step 2: Based on the array space, calculate the maximum diameter R, vertical height H, and vertical arc length L of the spherical array. H This invention addresses the problem of insufficient low-frequency gain caused by the limited installation space of spherical arrays. By using a design that combines a vector sparse spherical array with a scalar close-packed conformal array, it achieves high low-frequency gain, enabling it to have broadband high array gain with only a slight increase in the number of preprocessing channels, thus meeting the requirements for full-band detection.

This invention relates to the field of pressure testing technology and discloses an omnidirectional pressure measurement system and method. The omnidirectional pressure measurement system includes a spherical piezoelectric sensor array module, a signal conditioning module, a signal storage and transmission module, and a host computer. The spherical piezoelectric sensor array module collects pressure signals in space, processes them through the signal conditioning module, and transmits them to the host computer via the storage and transmission module. The host computer calculates the pressure field intensity and pressure source location at each point and reconstructs the pressure field using the data. This invention employs a spherical array design with a dodecahedral vertex topology, enabling the system to achieve multi-angle information acquisition and depth perception, eliminating detection blind spots. This invention constructs a weighting function in a spherical coordinate system, calculates the pressure intensity at each point in space using a weighted average, estimates the initial position of the pressure source by squaring the measured value, and combines iterative algorithms for precise positioning. This invention not only improves measurement accuracy and efficiency but also enables the reconstruction of dynamic pressure fields.

The application provides an acoustic event positioning method, device, system and computer readable storage medium, which is applied to an acoustic event positioning system and relates to the technical field of acoustic positioning. The method comprises the following steps: a high-order surround acoustic spherical array node acquires multi-modal fusion data; the high-order surround acoustic spherical array node sends the multi-modal fusion data to a data processing subsystem after compression processing; the data processing subsystem extracts and identifies features of the multi-modal fusion data based on a pre-trained multi-source data fusion positioning model, and outputs a type of acoustic event and coordinates of the acoustic event; wherein the multi-source data fusion positioning model comprises a feature extraction module and a space-time fusion module; accurate multi-modal fusion data is acquired, and the positioning model with the feature extraction module and the space-time fusion module is used for feature extraction and identification, so that the type and positioning of the acoustic event are accurately output, the calculation is simplified, and the phenotype of the model in a complex environment is significantly improved.

The application discloses a gradient water-collecting surface structure and a preparation method thereof. The gradient water-collecting surface structure comprises a substrate, a hydrophilic region and a hydrophobic region, and the hydrophilic region and the hydrophobic region are arranged on the surface of the substrate. The hydrophobic region has hydrophobicity. The hydrophilic region comprises a low-hydrophilicity subregion and a high-hydrophilicity subregion, and the high-hydrophilicity subregion is located between the low-hydrophilicity subregion and the hydrophobic region. The low-hydrophilicity subregion is provided with a first spherical array, and the high-hydrophilicity subregion is provided with a second spherical array. The specific surface area of the original copper oxide layer in the gradient water-collecting surface structure is increased, the contact area with water droplets is increased, and thus the water-collecting efficiency is improved. The first spherical array is composed of a plurality of first spherical protrusions, and the second spherical array is composed of a plurality of second spherical protrusions. The first spherical protrusions and the second spherical protrusions are both copper oxide. Compared with a copper single-element water-collecting surface, the wetting performance of the copper oxide is more stable when working in air, the copper oxide is not easy to be polluted, and the service life is greatly increased.

The invention discloses a photovoltaic maximum power point detection and visualization system with a human-computer interaction interface, and belongs to the technical field of solar photovoltaic power generation. The photovoltaic maximum power point detection and visualization system is composed of a spherical detector array device, a multi-channel signal acquisition front end, a tracking and power generation part and an upper computer visualization analysis terminal. The spherical detector array device is of a hemispherical structure, a detector array is carried on the outer surface of the spherical detector array device, and the multi-path signal acquisition front end is connected with the spherical detector array device and is composed of an analog switch array module, a signal conditioning circuit module, an MCU control core module, a Lora wireless communication module, a man-machine interaction display module and a power monitoring module. According to the method, illumination distribution is directly detected by adopting a spherical array, and the actual maximum power point direction can be more accurately found in complex weather such as local shadow and cloudy weather; and a local human-computer interaction interface is integrated, so that field maintenance personnel can intuitively obtain a system state and a tracking target in real time.

The application particularly relates to a wind noise source directivity quantization evaluation method. The method comprises the following steps: S1, wind noise directivity test of an in-vehicle spherical array, arranging a spherical microphone array to obtain a spatial distribution nephogram of the in-vehicle wind noise source; S2, spatial angle partition of the wind noise directivity, decomposing the noise source according to spatial regions, and performing equi-angle partition on the in-vehicle space; S3, frequency decomposition of the wind noise directivity, constructing an information matrix according to different frequencies; S4, establishing a quantization evaluation index of space and frequency according to the sound source information matrix, and identifying a short board; and S5, combining the in-vehicle spherical array test position and the quantization evaluation index to form an evaluation method classified according to working conditions, and judging the wind noise source directivity level of a developed vehicle model. The spatial angle partition and frequency decomposition of the sound source effectively support the achievement of the whole vehicle wind noise performance target and the analysis of the wind noise problem.

The invention provides an Au / Ag-PS spherical array SERS (Surface Enhanced Raman Scattering) substrate with an annular gap as well as a preparation method and application of the Au / Ag-PS spherical array SERS substrate, and belongs to the technical field of Raman spectrum detection. The preparation method comprises the following steps: S1, forming a closely arranged periodic PS ball array on a substrate subjected to hydrophilization treatment, and forming gaps between PS balls through etching; s2, depositing a gold layer on the surface of the upper hemisphere of each PS ball, then overturning to enable the lower hemisphere of each PS ball to face upwards, and depositing a silver sacrificial layer and a gold layer on the surface of the lower hemisphere in sequence; and S3, downwards fixing the lower hemisphere of the PS sphere array on the silicon substrate, and corroding the silver sacrificial layer by adopting a silver removing solution to form an annular nano gap, so as to obtain the SERS substrate. According to the SERS substrate, the electromagnetic field enhancement effect is optimized by accurately controlling the size of the annular gap, and the sensitivity and reliability of pollutant detection are remarkably improved.

The application relates to the technical field of detectors, and provides a spherical array Fresnel lens, a detector and a security system, wherein the spherical array Fresnel lens comprises a lens body, the lens body has an inner spherical surface and an outer spherical surface; a center lens sheet layer is arranged at the center of the inner spherical surface of the lens body, and the inner spherical surface of the lens body is further provided with a plurality of annular lens sheet layers; the center lens sheet layer comprises one Fresnel lens element, and the annular lens sheet layer comprises a plurality of Fresnel lens elements; the detector comprises the spherical array Fresnel lens; and the security system comprises the detector. The spherical array Fresnel lens, the detector and the security system provided by the application can be simultaneously applied to a wall-mounted installation mode and a ceiling-mounted installation mode while meeting the requirements of detection angles and detection distances.

This invention discloses an asynchronous measurement technique for 3D imaging of multi-point, non-planar low-frequency sound sources. It utilizes two 64-channel 3D spherical arrays for asynchronous measurement, proposing a unique dual-cylindrical spiral ascent and rotation movement method to achieve 3D point source imaging within low-frequency sound sources. This method differs from previous directional methods. It employs an asynchronous measurement technique involving the centers of two spherical arrays following a designed dual-cylindrical spiral parallel ascent trajectory and the array's rotation, applied to 3D imaging of multi-point, non-planar low-frequency sound sources. This results in a larger and denser array. To a certain extent, the asynchronous measurement method combining the dual-cylindrical spiral trajectory and rotation further improves the density of synthesized microphones compared to cylindrical trajectory asynchronous measurement methods and spherical array center revolution-rotation asynchronous measurement methods. The method is stable and efficient.

The invention discloses a vacuum sealing plate based on a sphere array and a split type vacuum hot pressing preparation method thereof, and belongs to the field of materials, the vacuum sealing plate is formed by hot pressing fusion of an upper function plate and a lower function plate in a vacuum environment, and a two-dimensional array formed by countless independent vacuum sphere units is formed in the vacuum sealing plate. Respectively prefabricating an upper functional board and a lower functional board which are provided with hemispherical pit arrays through injection molding; the prefabricated upper function plate is loaded into a vacuum operation chamber and accurately aligned, and vacuumizing is conducted till the vacuum degree is smaller than or equal to 1 Pa; the butt joint faces of the upper function plate and the lower function plate are heated to be in a molten state, pressure is applied to enable the upper function plate and the lower function plate to be folded, and the two corresponding hemispherical pits are sealed into an independent vacuum sphere unit; and maintaining pressure and cooling to obtain a finished product. The prepared multi-cavity vacuum sealing plate has excellent sound insulation and heat insulation performance, extremely high structural reliability, excellent bending performance and convenient secondary processability which other single-cavity vacuum plates do not have, and can be widely applied to the fields of vehicle light weight and building energy saving.

The invention discloses a multi-sensor efficient integration verification method, system and device based on multiple phase centers and a medium, and relates to the field of radio frequency sensor dynamic integration verification. Aiming at the defect that a single-phase center of a traditional darkroom cannot verify multiple sensors at the same time, multiple phase centers in the same airspace are constructed in the darkroom based on a multi-band triple spherical array radiating antenna, and tested equipment is deployed through multiple synchronously-controlled six-degree-of-freedom motion platforms to ensure attitude consistency; the system master console resolves scene parameters in real time, and high-precision angle and echo simulation is carried out through the array feed control subsystem and the comprehensive signal source; cooperative verification of electronic reconnaissance interception guide radar tracking and radar tracking guide attribute identification is realized in a closed loop. According to the method, the physical space limitation of a darkroom is broken through, a complex space three-dimensional dynamic interaction scene is reproduced with high confidence, and the blank of complete machine multi-sensor cooperative capability integrated verification is filled.

The invention relates to the technical field of medical instruments and information, and discloses an oral cavity scanner and an oral cavity scanning method, and a self-adaptive flexible shell, the appearance of the self-adaptive flexible shell is set to be of a spherical structure matched with the geometrical shape of the human oral cavity, and the self-adaptive flexible shell is made of a biocompatible elastic material; a rubber bracket is arranged in the self-adaptive flexible shell to limit the relative spatial relationship of the imaging array, and the self-adaptive flexible shell has preset Shore hardness to keep the relative topological reference of internal components through the rubber bracket when the self-adaptive flexible shell is pressed to deform. By means of the spherical array topology and the 140-degree wide-angle macro lens, 360-degree full coverage of the inner wall of the oral cavity is achieved, the problem of collection dead angles of a traditional handheld device in a posterior molar area, a lingual area and the edge of gingiva is solved, handheld guiding is replaced with a self-adaptive flexible sphere holding mode, a user does not need to have professional anatomical knowledge or steady-state control ability, and the user experience is improved. And the operation difficulty in a home scene is greatly reduced.

The invention provides a three-dimensional dereverberation beam forming method and system based on a cross-correlation matrix, and relates to the technical field of sound source recognition, and the method comprises the steps: collecting sound pressure data through a spherical microphone array; performing fast Fourier transform on the sound pressure data to obtain corresponding frequency domain data; calculating a cross-spectrum matrix corresponding to the spherical array according to the frequency domain data; eliminating reflected sound components contained in the cross-spectrum matrix to obtain a filtered cross-spectrum matrix; and drawing a sound source identification cloud picture based on the filtered cross spectrum matrix. According to the three-dimensional dereverberation beam forming method based on the cross-correlation matrix, the technical problem of insufficient sound source recognition precision of a spherical array in a complex sound field environment in the related technology is solved.

The invention discloses a method and a system for quickly and accurately controlling the angular position of a multi-radiation source target. The system comprises a target simulator, an array feed unit and a main control unit, a device control code mapping table is pre-stored in the main control unit; the main control unit performs cooperative control on the target simulator and the array feed unit, and the target simulator generates a multi-radiation source target signal, a pulse synchronization signal, a frequency code and a target code; the array feed unit is triggered by a rising edge of a pulse synchronization signal, calls a device control code from a device control code mapping table according to a target code and a frequency code, performs triple branch channel distribution and amplitude-phase modulation on a multi-radiation source target signal, and radiates to a tested device by a spherical array antenna; according to the invention, rapid and accurate simulation of the multi-radiation source target angular position along with pulse synchronization is realized.

This invention discloses a virtual array formation method for a mathematical multi-beam spherical phased array antenna, comprising: controlling the geometric dimensions of subarrays to keep the influence of aperture transit time of array elements within the subarrays within an effective range, i.e., using phase compensation to complete beamforming within the subarrays without considering the influence of aperture transit time; and then completing beamforming of the spherical array antenna between subarrays in the active region using a time delay compensation method; wherein, only phase compensation is performed between array elements within a subarray, and time delay compensation is performed between subarrays. This invention can meet the beamforming requirements of broadband signals for digital beamforming spherical phased array antennas, and the implementation method is simple.

The application discloses a multi-sensor efficient integration verification method, system, device and medium based on multiple phase centers, relates to the field of radio frequency sensor dynamic integration verification, and aims at the defect that a traditional darkroom single phase center cannot verify multiple sensors simultaneously, constructs multiple phase centers based on a multi-band triplet spherical array radiation antenna in the darkroom, deploys a test device through multiple six-degree-of-freedom motion tables to ensure attitude consistency, and realizes the cooperative verification of electronic reconnaissance interception guiding radar tracking and radar tracking guiding attribute identification in a closed loop. The application breaks through the limitation of the physical space of the darkroom, reproduces a complex spatial three-dimensional dynamic interaction scene with high confidence, and fills the gap of the integration verification of the cooperative capability of the whole machine multiple sensors.

A hologram acquisition apparatus and a hologram acquisition system are disclosed. A hologram acquisition apparatus includes a beam splitter configured to split light emitted from an object into a first beam and a second beam, a first reflective optical element configured to receive and emit the first beam to the beam splitter, and a second reflective optical element configured to receive and emit the second beam to the beam splitter and formed as an annular spherical array having discontinuous surfaces, wherein the second reflective optical element has a plurality of segment regions that are concentric and divided to have the discontinuous surfaces and, the plurality of segment regions are formed to have the same focal point.

This application relates to the field of wind tunnel simulation testing technology, specifically to a complex wind environment simulation testing device, used to solve the problem in existing wind tunnels where direct convergence of airflow can easily lead to turbulence and impede airflow quality improvement. It includes a support frame and a wind tunnel assembly connected to the support frame; wherein the wind tunnel assembly includes multiple sub-wind tunnels, each sub-wind tunnel having an inlet and an outlet. All the inlets are arranged in a spherical array, and all the outlets are arranged in a rectangular array. The inlets have an arc-shaped flared structure, and the outlets of all the sub-wind tunnels are arranged adjacently so that the overall structure of all the sub-wind tunnels forms a contraction shape. This application utilizes the inlets to provide guidance, reducing airflow rebound, and since each sub-wind tunnel is independent, turbulence is less likely to occur, resulting in a relatively high quality of the final output airflow.

The application discloses a deployment support structure and an inflatable spherical array antenna system using the same. The deployment support structure comprises a plurality of deployment and retraction modules arranged in a central symmetry. The deployment and retraction modules are used for supporting a spherical body and providing structural rigidity for the spherical body after being deployed. The inflatable spherical array antenna system comprises a base, a deployment support structure and an inflatable spherical body arranged above the base. The deployment support structure is used for supporting the inflated inflatable spherical body. The inflated inflatable spherical body is in a spherical structure. A waistband and an array antenna are arranged at the equator of the spherical body of the inflatable spherical body. The array antenna is arranged inside the inflatable spherical body. The waistband and the array antenna are coaxially arranged and fixed. A buoy is arranged at the bottom of the base. The array antenna is in the form of an array antenna, and automatic deployment is realized. The application has the characteristics of low cost, light weight, large storage ratio and easy deployment.

This invention relates to a channel estimation and user localization method based on a spherical array intelligent metasurface. Specifically, it includes: designing a spherical array intelligent metasurface (RIS) by arranging reconfigurable reflective elements in an ordered manner according to a three-dimensional spherical topology; constructing a beam training signal model based on standard multivariate decomposition according to the multipath propagation characteristics of cascaded channels, and recovering the path angle parameters on the base station side using a tensor signal processing algorithm; designing a RIS training reflection coefficient beamforming method based on the spherical phase mode excitation principle, and recovering the equivalent path angle parameters on the RIS side using a spatial spectrum estimation algorithm; and achieving unique decoupling of user path angle and time delay parameters based on the free-space propagation characteristics of broadband multicarrier signals, thus completing user localization. This invention can achieve unambiguous channel estimation, which is unsupported by traditional planar array RIS, with lower hardware costs and training overhead, thereby enabling high-precision user localization applications.

The invention discloses a monopulse simulation method under the condition of local damage of a darkroom array, and the method comprises the steps: determining an array region which needs to be used on a spherical array when an aircraft carries out the semi-physical simulation in a radar darkroom, and a damaged array region on the spherical array, and selecting a new array region; a rotary table for fixing an aircraft is controlled to rotate according to a preset angle, so that the midpoint of the area corresponds to the zero position of the rotary table at the center of a radar darkroom, and the orientation of a monopulse radar guide device carried on the aircraft is kept away from a damaged array area; according to the determined preset angle and a rotation angle instruction of executing the first rotation sequence by the aircraft on the turntable, calculating a rotation angle instruction of executing a second rotation sequence by the turntable; according to the preset angle and a sight angle needing to be simulated during simulation of the aircraft, a rotation angle instruction of executing a second rotation sequence by the spherical array is calculated; and the rotary table and the spherical array are executed according to the corresponding rotation angle instructions, so that a monopulse simulation process is performed.

The invention relates to the technical field of wind tunnel simulation tests, in particular to a complex wind environment simulation test device, which is used for solving the problems that turbulence is easily caused and the quality of airflow needs to be improved due to direct convergence when the airflow is taken in a wind tunnel in the prior art. The device comprises a support and a wind tunnel assembly connected to the support. Wherein the wind tunnel assembly comprises a plurality of sub wind tunnels, each sub wind tunnel is provided with an air inlet and an air outlet, all the air inlets are arranged in a spherical array, all the air outlets are arranged in a rectangular array, each air inlet is of an arc-shaped flaring structure, and each air outlet is of an arc-shaped flaring structure. And the air outlets of all the sub-wind tunnels are adjacently arranged so that all the sub-wind tunnel structures integrally form a contraction shape. The air inlet is used for providing a guiding effect, airflow rebound can be reduced, the sub-wind tunnels are mutually independent, turbulent flow is not likely to be generated, and the quality of the finally output airflow is relatively high.

This invention provides a planar receiving transducer array for deep-sea mapping and its implementation method, comprising: fixing all spherical array elements of the multibeam transducer array using a positioning mold, and performing a first encapsulation with polyurethane; removing the upper spherical positioning fixture, cleaning the surface of the spherical elements, preheating them in an 80°C oven for 1 hour, then coating the surface of the spherical elements and the upper end of the polyurethane with a coupling agent, and placing them in an 80°C constant temperature oven for 1 hour before performing a second polyurethane encapsulation; flipping the receiving transducer array over, completing the array lead welding, and performing a third encapsulation of the receiving transducer array; preheating the receiving transducer array after three encapsulations for 1 hour, coating the surface with a coupling agent, placing it in a fourth encapsulation mold to complete a fourth encapsulation, curing it in an 80°C constant temperature oven for 8 hours, and then demolding it after it naturally cools to room temperature; and finally, assembling the fastening clamps onto the fastening studs of the encapsulated receiving transducer array to obtain a planar receiving transducer array suitable for deep-sea mapping.

The application discloses a kind of arbitrary electromagnetic scene near-field simulation device, belong to electromagnetic test and simulation technical field.The device is mainly by target field, near-field synthesis method and near-field synthesis phased array face composition.Through the unit excitation weighting of optimization phased array aperture array, the synthesis of arbitrary target field can be realized in near-field synthesis surface, wherein phased array aperture array needs to be laid out according to the highest spatial frequency of target field.If the highest spatial frequency of target field is smaller, it requires that the unit spacing of phased array aperture array is larger, then phased array aperture array can be plane array;If the highest spatial frequency of target field is larger, it requires that the unit spacing of phased array aperture array is smaller and the space angle of phased array surface is larger, then phased array aperture array needs to be cylindrical array or spherical array.The application can realize the near-field simulation of arbitrary electromagnetic scene, has the advantages of compact system, electromagnetic environment simulation materialization, and high fidelity, can be applied to radar target scene, communication channel scene and other fields electromagnetic environment simulation.

The application provides a three-dimensional spherical array interferometer direction finding method based on MUSIC, which comprises the following steps: constructing a spherical array; using the method of uniform spherical array, constructing a direction finding device with array elements distributed in a spherical form, and representing the position parameters of each array element on the array surface in a polar coordinate form; assuming wave incidence parameters, taking the center of the sphere as a reference zero phase point, and calculating the received phase data of each array element under the condition of plane wave incidence; performing fast sampling on the received phase data of each array element at a sampling rate to obtain a receiving matrix; calculating the covariance matrix of the receiving matrix to obtain an eigenvalue matrix and an eigenvector; estimating the number of signals according to the eigenvalue matrix, dividing the eigenvector into a signal subspace and a noise subspace; using the characteristic that the eigenvectors of the signal and noise subspaces are irrelevant, obtaining the spatial spectrum value in the search region, and finding the position corresponding to the maximum value. The application solves the problem that the elevation angle direction finding accuracy of a two-dimensional plane array decreases rapidly with the increase of the elevation angle.