117 results about "Planar array" patented technology

The invention relates to a two-dimensional slicing method and device for a three-dimensional model, and the method comprises the steps: carrying out the coordinate system conversion and bounding box calculation of the three-dimensional model constructed by a triangle, and obtaining a target bounding box; according to the size of the target bounding box, the direction with the small cutting number is determined as the cutting direction, and orthogonal cutting is conducted on the target bounding box; performing intersection judgment on all triangular patches in the three-dimensional model according to the target bounding box and the cutting direction; cutting and comparing triangles in the intersecting triangle set with planes in the cutting plane array to obtain a plurality of sequence points, and connecting all the sequence points to obtain a two-dimensional slicing result; the optimal cutting direction is determined through coordinate system conversion and bounding box calculation, orthogonal cutting and triangular patch intersection judgment are combined, the slicing efficiency of the large-scale three-dimensional model is remarkably improved, manual intervention is reduced, the real-time processing requirement is met, and the method has the advantages that the optimal cutting direction is automatically determined, and the processing efficiency of the large-scale model is improved.

The invention relates to the technical field of satellite communication, in particular to a high-gain phased array receiving antenna system for low-orbit satellite communication, which comprises a radiation feed integration module, a beam phase mapping module, a digital beam forming module, a signal amplification module, a protection packaging module and a performance verification module. Stacking strip line feed networks and performing electromagnetic coupling to obtain an initial radiation channel; receiving and analyzing a beam control instruction through an embedded circuit, extracting a target beam pointing angle and mapping the target beam pointing angle into a phase offset; generating a digital phase control word according to the phase offset, and applying the digital phase control word to the radio frequency signal to complete phase calibration; a transistor with a low-noise amplification structure is used for enhancing the calibrated signal energy; the wave-transparent front cover covers the radiator, and the electromagnetic shielding rear cover wraps the internal components to form an assembly in a sealing manner; and verifying the gain and beam switching rate of the assembly in the typical frequency band of the low-orbit satellite. According to the invention, the low-orbit satellite communication signal receiving efficiency can be improved.

The application provides a uniform plane array FDA-MIMO three-dimensional target positioning method and system based on complete decoupling atomic norm minimization. The method converts the problem into a semi-positive programming solution by constructing a low-dimensional observation matrix and using complete decoupling atomic norm, and realizes joint estimation of distance, pitch angle and azimuth angle through Vandermonde decomposition. Compared with high complexity algorithms (VANM, etc.), the application significantly reduces the calculation amount by decomposing the Toeplitz matrix, and improves the single snapshot precision by using the multi-slice constraint mechanism. Compared with low complexity algorithms (3D-DANM), the application introduces an auxiliary variable matrix to restore the distance-angle coupling structure, avoids the performance loss caused by excessive relaxation, and significantly improves the estimation accuracy and multi-target resolution capability while ensuring the calculation efficiency.

The application provides a FDA-MIMO radar gridless target parameter estimation method based on a single base plane array, relates to the technical field of array signal processing, constructs a single base plane array FDA-MIMO radar system, and the transmitting end and the receiving end of the radar system are composed of a uniform plane array; a receiving signal model is established based on the radar system, the model is vectorized, a selection matrix is introduced to construct an angle-distance decoupling receiving signal model; the covariance matrix of the receiving signal model is calculated; a low-rank matrix reconstruction optimization problem suitable for the model is established according to the covariance matching criterion; the optimization problem is solved by the idea of alternating projection by using the properties of the covariance matrix; the information of the angle theta and the distance r is estimated by the multiple signal classification method according to the covariance matrix; the problems that the FDA-MIMO radar angle-distance decoupling model in the prior art is only suitable for a linear array, and the target parameter estimation method has low estimation accuracy and high calculation complexity can be solved.

This invention discloses a mercury cadmium telluride infrared detector and its fabrication method. The method innovatively employs negative photoresist and a lift-off process to grow a metal mask and define contact hole patterns. This metal mask layer serves as both an ion implantation mask and a contact hole etching mask, solving the problems of implantation region positioning deviation and size mismatch in traditional processes. It enables ultra-small cell spacing, improves the detector's photoelectric performance and array uniformity, and is suitable for the large-scale fabrication of high-density infrared detector planar arrays.

The sensing system includes a focal plane array, a detector dual input circuit, a detector selector circuit, and a selection module. The focal plane array includes a plurality of detectors. The detector dual input circuit combines outputs from the detectors received on a first input channel without using outputs received on a second input channel. The detector selector circuit establishes a first signal path between the detectors and the first input channel and a second signal path between the detectors and the second input channel. The detector selector circuit includes a mask that maps the detectors to a first detector group or a second detector group. Based on the mask assignment, the selection module connects one or more of the detectors to the first signal path to establish the first detector group and connects one or more of the detectors to the second signal path to establish the second detector group.

The invention relates to the technical field of shock absorption supporting of aircrafts, and discloses a low-frequency shock absorption supporting structure and an aircraft, and the supporting structure is a metamaterial which is formed by arranging a plurality of cell element structures with the same structure in a planar array mode to form one or more layers of coupled and stacked metamaterials; the cell structure is a cylindrical structure enclosed by four wall plates, and a cavity is formed in the cell structure; each wall plate comprises a first plate section and second plate sections located on the upper side and the lower side of the first plate section. The first plate section is rectangular, and the second plate section is isosceles trapezoid; the first plate section is provided with two first edges which are opposite up and down; the second plate section is provided with a second edge parallel to the first edge, and the second edge is shorter than the first edge; the first plate sections of the adjacent cell structures are attached to each other, and the openings of the upper and lower cell structures are aligned during stacking. Through relative compression deformation motion between the top substrate and the cell element structure, vibration energy is absorbed, and the influence of vibration on precise instruments in the aircraft is reduced.

The application discloses a two-dimensional sparse array single-shot DOA estimation method based on a deep unfolding convolutional network, and belongs to the technical field of cross array signal processing and deep learning. First, a two-dimensional uniform planar array is constructed, and sparse observation data are constructed. Then, an isomorphic tensor mapping mode of separating real parts and imaginary parts is adopted to decompose the sparse observation signals and splice them along the channel dimension, so that a three-dimensional input tensor containing real part channels and imaginary part channels is constructed to maintain the two-dimensional spatial topological structure of the array. Then, the overall structure of the deep unfolding network is unfolded, and a sliding window rule with a predetermined size is used to rearrange the two-dimensional array data into a block Hankel matrix. Finally, network training is performed to realize DOA estimation. The application maintains the two-dimensional spatial structure, improves the reconstruction accuracy, reduces the computational complexity, improves the robustness under a low signal-to-noise ratio condition, realizes high-precision DOA estimation under a single-shot condition, and has good engineering application value.

The invention discloses a histogram data processing method and related equipment thereof, and relates to the field of laser radars, and the method comprises the steps: obtaining a current histogram which is obtained after an area array laser radar module with a plurality of pixel points detects a target object; converting the current histogram to a target domain, wherein the target domain comprises a frequency domain; part of target spectrum values of the current histogram in the target domain are reserved, a compression result is obtained, and the part of target spectrum values reflect corresponding peaks and peak height information of the current histogram. According to the invention, consumption of excessive coding resources and storage space can be avoided.

The present application relates to a kind of improved precision angle measurement method of face array camera interior orientation element calibration method, steps are as follows: according to the arrangement of precision angle measurement method, record the angle of each measuring line and camera image coordinate axis, the coordinates of each measuring point and corresponding two-dimensional turntable angle of measurement equipment;Measuring point coordinates normalization calculation, constructs distortion model;All interior orientation parameters and measurement data are uniformly constructed distortion correction residual model;With distortion residual minimum as objective function, solve interior orientation element using nonlinear optimization algorithm.The present application method is applied to face array camera, without limiting the angle of parallel light rotation respectively and the accurate parallelism of camera image coordinate axis in experimental measurement, reduce the cost and difficulty of calibration, and construct the interior orientation element unified solution framework covering camera principal point, camera principal distance, distortion parameter, improve the precision of interior orientation element.

The invention discloses a beetle elytra-imitated interlocking structure, a metamaterial plate comprising the beetle elytra-imitated interlocking structure and a composite armor system, and belongs to the field of multifunctional advanced protective materials. The interlocking structure comprises a plurality of functional elements arranged in a planar array, the adjacent functional elements are mechanically connected through geometric interlocking interfaces, the contact surfaces of the geometric interlocking interfaces are in a non-chemical bonding state and can generate relative dislocation under an impact load, and the geometric interlocking interfaces are in a non-chemical bonding state. Each functional element is integrally prepared from a polymer-based composite material dispersed with an electromagnetic loss filler, the interior of each functional element is of a three-dimensional porous micro-lattice structure with a negative Poisson's ratio effect, and the porosity and / or cell size of each three-dimensional porous micro-lattice structure are / is changed in a gradient manner in the thickness direction of the corresponding functional element. The metamaterial plate and the composite armor system using the interlocking structure can effectively inhibit structural layering under an impact load, can actively improve anti-penetration capability, and also have an excellent broadband electromagnetic wave absorption function.

A focal plane array system includes a plurality of pixels configured to output a first signal light beam and to receive a second signal light beam reflected from a target object. Each of the plurality of pixels includes a transmitter, a receiver, and an interference light beam controller that includes a splitter disposed on an emission path of the first signal light beam to split a portion of the first signal light beam into an interference light beam, a receiving coupler disposed on a receiving path of the second signal light beam reflected from the target object, and a waveguide configured to transport the interference light beam split from the splitter to the receiving coupler. The receiving coupler is configured to transport the second signal light beam reflected from the target object to the receiver and to combine the interference light beam with the second signal light beam.

The present invention belongs to the technical field of electroacoustics in electronics, and relates to an audio system formed by a speaker-enclosure planar array, and a preparation method for the audio system. Different from the prior art, the present invention uses a plurality of small / -micro-aperture speakers to form a special planar array audio device, such that by using the plurality of small- / micro-aperture speakers, audio signals with frequencies of 20-120 Hz or even higher, which are typically cut off in small-aperture speaker systems, are caused, by means of synchronous superposition operation, to output powerful, clear and pure bass sound waves. Moreover, an algorithm for a linear digital filter is used to perform frequency division and surround sound processing on digital audio signals of the speakers without generating a phase shift. Therefore, a series of functional defects in conventional large-aperture subwoofers are overcome, thereby enabling the planar-array audio system to achieve a surround sound effect in a three-dimensional or two-dimensional space.

The invention discloses a three-dimensional force tactile representation method and system based on planar Halbach array magnetic moment vector regulation and control. A planar array electromagnet is excited to generate a three-dimensional controllable electromagnetic field, excitation current of the planar array electromagnet is adjusted, and electromagnetic acting force borne by a fingertip magnet module is regulated and controlled; using a finite element simulation method to calculate and obtain electromagnetic force simulation discrete data when the fingertip magnet module is located at discrete grid points of the real operation space; analyzing data to design a control strategy, namely determining excitation current of each coil of the planar Halbach array electromagnet according to the relative position and expected stress of a fingertip magnet module in an operation space so as to realize force feedback in a three-dimensional space; according to the three-dimensional force tactile representation method, a planar Halbach array magnetic moment vector regulation and control method is innovatively proposed to regulate the electromagnetic field of each position in a real operation space, and three-dimensional force tactile feedback capable of precisely regulating and controlling the magnitude and direction of feedback force in a large range is realized in combination with a fingertip magnet module.

The invention discloses a method for detecting a visual area of a super-large scale intelligent super-surface (RIS) auxiliary communication system, the RIS is a uniform planar array, and the method comprises the following steps: sequentially detecting the first unit, the second unit and the fifth unit on an RIS array plane, and judging whether the first unit, the second unit and the fifth unit are shielded or not; delimiting an initial area according to the shielding conditions of the five units, and judging whether the initial area is completely shielded or not; if the initial area is completely shielded, a DFS algorithm is used for all units on the boundary of the initial area in sequence, all shielded units are detected, and therefore the final visible area is recovered; if the initial area is not completely shielded, a binary search strategy is adopted, a shielded unit is detected firstly, then the unit serves as a starting point, all shielded units are detected through a DFS algorithm, and then the final visible area is recovered. According to the invention, accurate visual area detection is realized with low complexity and measurement overhead.

The present application belongs to the technical field of 3D printing model preprocessing, and particularly relates to a group support unit generation method and device, electronic equipment and a storage medium. The method comprises the following steps: traversing a model; obtaining a model frame; aligning to an origin; raising the model; dividing a preset grid; obtaining a model vertical projection range; obtaining a preset grid in the projection range; obtaining a grid center point; determining an extraction point; determining a projection intersection point; establishing a planar array of polygons; sequentially grouping the extraction point and the nearest polygon vertex and determining them as a grouping set; obtaining a projection intersection point normal vector; extending downward by P millimeters from the projection intersection point in the direction of the normal vector to generate a contact column, and then extending to the plane coordinates of the polygon vertex in the grouping set according to a preset offset angle to generate a folding column and a support node; generating a main support column; generating an intra-group truss between the main support columns according to the polygon vertex connection relationship; and storing data. The method can generate group support units in batches at the bottom of the model.

The invention relates to an ultrasonic hollow plane array focusing method based on pseudo-inverse matrix solution, and belongs to the technical field of man-machine interaction and virtual reality. Based on a sound pressure radiation model of a circular piston, sound pressure distribution characteristics generated by a single emitter in a sound field are established, a mathematical relationship between the total sound field sound pressure of the whole array and excitation amplitudes of all the emitters is derived on the basis, and an ideal sound field distribution target is set, so that the sound field of the array is obtained. And inversely solving the optimal amplitude configuration of each transmitter by adopting a pseudo-inverse matrix algorithm so as to control the sound field. The method is used for solving the problems that focusing energy is dispersed and the focus shape tends to be oval due to the fact that the side lobe is too large during single-point focusing of the hollow plane ultrasonic array, the side lobe level is remarkably restrained, the focus energy concentration ratio and shape regularity are improved, and the focusing performance of the hollow plane array is effectively improved.

The invention belongs to the technical field of millimeter wave phased-array antennas, and particularly discloses a circularly polarized spherical phased-array antenna for Ka-band operation, which comprises a hemispherical antenna base and a plurality of radiation units, the plurality of radiation units are arranged on the hemispherical surface of the hemispherical antenna base in an array form; the circularly polarized spherical phased-array antenna is configured in a frequency range from 27GHz to 29GHz, so that + / -90-degree beam scanning of any azimuth tangent plane is realized. The scanning angle limitation of a planar array is broken through, and + / -90-degree continuous scanning of any tangent plane is realized; meanwhile, the array element spacing and the arrangement density are optimized in combination with the short wavelength characteristic of the Ka wave band, the mutual coupling effect of the high frequency band is reduced, and the problem that the actual use effect is poor due to the fact that the large-angle scanning radiation capacity of an existing Ka wave band planar phased array antenna is limited and the polarization purity is reduced is solved.

A stacked focal planar array (FPA) device and method of fabrication. The method can include forming photodetectors or FPAs by heteroepitaxial growth of III-V PINs, APDs, or other photodetector devices that are bonded to a Si-based read-out integrated circuit (ROIC) wafer in a stacked configuration. In a single-color device example, a wavelength configuring buffer layer and photodetector are grown on a first substrate using compound semiconductor materials to enable infrared detection at desired wavelength(s). Depending on the application, this growth can be done on a graded compliant buffer layer and / or a selectively transparent buffer layer. And, silicon detectors can be incorporated to detect visible and NIR wavelengths in a dual-color device example. Further, the resulting devices can be bonded overlying the ROIC device in a flipped orientation and configured as pixels in a sensor array device coupled to the ROIC device.

This invention relates to the field of millimeter-wave radar and discloses a millimeter-wave antenna. The millimeter-wave antenna of this invention includes a feed line and multiple antenna elements connected to the feed line. The multiple antenna elements include a feed-end antenna element and a terminal antenna element connected to the feed line's feed end and end, as well as one or more trapezoidal antenna elements. The millimeter-wave antenna of this invention has a wide antenna bandwidth; the antenna linear arrays can be very close together, which is beneficial for selecting smaller element spacing during antenna linear array layout design. Furthermore, when forming a planar array, reducing the spacing between adjacent antenna linear arrays can reduce the lateral dimension of the antenna planar array.

The invention discloses a spatial three-dimensional fixed-point secure transmission method based on a planar array, constructs a spatial three-dimensional fixed-point secure transmission architecture based on a planar array antenna, and solves the problems that aiming transmission can only be realized in a two-dimensional space based on a linear frequency control array antenna, and accurate fixed points in a vertical distance of a three-dimensional space cannot be realized. By means of a beam forming algorithm based on weighted vector product optimization, the problems that planar frequency control array beam forming is high in complexity and poor in main lobe energy focusing degree are solved.

The application discloses a 3D ranging system, comprising: a line light source assembly for generating and collimating a line light beam in a first direction to irradiate a target scene; a scanning assembly for scanning the line light beam in the first direction to cover the target scene; a receiving assembly comprising a receiving lens and a planar array detector, the planar array detector being a SPAD planar array detector with a counting function, for receiving a light spot of the line light beam reflected by the target scene and counting photons during exposure; and a signal processing unit connected with the receiving assembly, for: after each frame exposure, extracting pixel position information and integral energy information of the light spot in the first direction based on counting data of the SPAD planar array detector; calculating distance data of each point of the target scene in a second direction according to the pixel position information by using a triangulation principle; obtaining a current scanning angle of the scanning assembly in the first direction; and combining the current scanning angle with the distance data to generate three-dimensional point cloud data of the target scene.

This invention provides a non-destructive testing device and method for nut quality based on a fully automated micro-CT scanner. The method includes: S1, using a transport mechanism to transport the nuts to a rotating platform; S2, keeping the micro-focal spot X-ray source and the flat panel detector stationary, and controlling the rotating platform to rotate intermittently via a PLC controller to achieve full-angle irradiation of the nuts by the micro-focal spot X-ray source; S3, during the intermittent stops of the rotating platform, acquiring planar array images of the nuts from various angles using the flat panel detector to obtain a full-angle planar array image of the nuts, and transmitting it to a computer; S4, the computer performs tomographic reconstruction and image processing based on the full-angle planar array image to obtain the quality trait parameters of the nuts. This invention enables non-destructive testing of nut quality trait parameters through visual recognition technology, significantly improving testing accuracy and efficiency compared to manual trait testing methods and traditional culture methods for detecting mold infection.

The application discloses a kind of area response difference's face array satellite image relative radiation correction method considering difference. The method is first based on NSCT transformation to remove the coarse features of image, then remove the fine features of image by RCV, and then obtain the image mainly containing noise, estimate relative radiation correction coefficient by constructing prior model considering area response difference, and under the constraint of corresponding cloud mask, other images obtained by the same sensor are carried out relative radiation correction, so as to eliminate the imaging quality degradation of face array satellite image caused by inconsistent response of probe element, and improve the radiation quality of face array satellite image. By removing coarse features and fine features, the application can effectively reduce the number of face array satellite images required for estimating relative radiation correction coefficient.

This invention relates to a method for testing the modulation transfer function (MJF) of TDICMOS detectors. It addresses the problem of difficulty in identifying and interpreting useful image data during existing MJF testing of TDICMOS detectors. The invention first adjusts the relative position of the detector and target using a planar array mode, and then switches to a linear array mode. The gate transfer control signal of the TDICMOS detector is output normally during the charge transfer phase, but is disabled during the exposure phase. The valid data signal outputs periodic high and low level signals when the gate transfer control signal is present; otherwise, it is a constant level. The charge transfer levels for panchromatic and multispectral images are set to the maximum available levels, and the cyclic frame period length is an integer multiple. Synchronous transmission of panchromatic and multispectral images is ensured, resulting in relatively stable panchromatic and multispectral images in each received frame.

This invention provides an electronic card cooling device with a multi-dimensional extended structure. Through a collaborative design of a two-dimensional planar array and a three-dimensional cascade, it significantly increases the effective working volume of the electronic card material within a limited space, thus laying the structural foundation for improved cooling capacity. Based on this, the cooperation between the magnetic drive unit and the mechanical linkage module enables stable and rapid reciprocating motion of the electronic card components between the hot and cold ends. Furthermore, the timing delay control of the circuit control system further ensures precise synchronization between the temperature change cycle of the electronic card effect and the mechanical motion cycle, allowing the electronic card material to absorb heat when in contact with the hot end and release heat when in contact with the cold end, avoiding energy loss. This invention, by simultaneously expanding the number of electronic card materials and components in two-dimensional and three-dimensional space, achieves a spatial dimension multiplication of cooling capacity, maximizing the cooling effect in space-constrained scenarios, and providing an effective solution to overcome the bottlenecks of existing electronic card cooling technologies.

An enclosed spaces fire detection system is provided. An enclosed spaces fire detection system includes a housing configured to be mounted in an enclosed space, such as an attic, a garage, a kitchen, or a laundry room; and at least one infrared imaging camera supported by the housing and including a thermopile focal plane array (FPA) with an antireflective layer on a thermopile lens configured to pass infrared radiance in a first range corresponding to a fire in the enclosed space.

This invention relates to the field of acoustic wave measurement technology, and more particularly to a sound pressure sensor based on the Fabry-Perot principle and its manufacturing method, comprising: a sleeve, the sleeve including a horn-shaped cavity; an optical fiber, fixedly disposed on the sleeve and located at the end with the smaller opening of the horn-shaped cavity, the end of the optical fiber inside the horn-shaped cavity including a first reflecting surface; an array diaphragm, fixedly disposed on the sleeve and located at the end with the larger opening of the horn-shaped cavity, the end of the array diaphragm inside the horn-shaped cavity including a second reflecting plane; and a plurality of protrusions arranged in an array on the surface of the array diaphragm at the other end of the second reflecting surface. In this invention, the array diaphragm is provided with a plurality of protrusions arranged in an array on the surface of the diaphragm at the other end of the second reflecting surface. The design of these protrusions helps to increase the deflection change of the diaphragm under the action of sound waves, amplifying the influence of external sound pressure on the deflection of the center point of the compressed diaphragm, thereby enhancing the sensitivity of the sensor.

This application relates to a method for achieving super-resolution angle measurement in a non-uniform area array tracking radar. The method includes: performing first-level amplitude and phase correction and azimuth-dimensional digital beamforming on the non-uniform area array based on the amplitude ratio and phase difference of each element relative to a reference element, thus converting the non-uniform area array into an equivalent virtual non-uniform linear array; and performing second-level amplitude and phase correction on the virtual non-uniform linear array based on the amplitude ratio and phase difference of each equivalent element relative to a reference equivalent element. This application achieves super-resolution angle measurement by performing two-level amplitude and phase correction on the non-uniform area array, effectively converting the complex non-uniform area array into a simple virtual uniform linear array. Furthermore, based on this virtual uniform linear array, a computationally efficient maximum likelihood estimation algorithm based on observation geometry is applied.