1511 results about "Beam scanning" patented technology

The invention discloses a broadband high-efficiency 1bit circularly polarized reconfigurable transmission unit and an array antenna. The reconfigurable transmission unit comprises a circularly polarized wave receiving patch, an upper-layer dielectric substrate, an upper-layer metal ground plane, a middle dielectric substrate, a DC bias line, a lower-layer metal ground plane, a lower-layer dielectric substrate and a radiation patch which are sequentially arranged from top to bottom, and can directly realize two unit phases of 0 degree and 180 degrees of circularly polarized transmission waves; the equivalent rotation phase is free of dispersion; the state of each unit in the transmission array is controlled through the FPGA, + / -60-degree large-angle scanning of circular polarization transmission beams can be achieved, the beam performance is good, and high circular polarization purity is achieved. The array antenna provided by the invention has the advantages of wide axial ratio bandwidth and high aperture efficiency, and has relatively high application potential and value in scenes requiring real-time electric control circular polarization beam scanning antennas, such as application of long-distance radar detection, communication systems and the like.

The invention relates to the technical field of unmanned aerial vehicles, and particularly discloses an unmanned aerial vehicle millimeter wave radar detection system and method and an unmanned aerial vehicle, and the system comprises a millimeter wave radar module which is used for executing multiple detection tasks and detecting the distance, speed and angle information of a target object, and has the functions of beam scanning and signal transmitting and receiving; the signal processing module is used for processing the received radar echo signal, performing target object detection and positioning through signal analysis, and generating a target positioning result; the target tracking module is used for tracking the target according to the target positioning result and the sensor data of the unmanned aerial vehicle; the method improves the signal intensity and detection distance in different detection environments by optimizing the direction and focusing of radar beams in real time, effectively eliminates noise interference through the Kalman filtering and particle filtering technology, accurately estimates the distance, speed and angle information of a target, and improves the detection accuracy through combining a deep learning algorithm and an adaptive filtering strategy. And processing details of the radar echo signals are dynamically optimized.

The invention relates to the technical field of TDOA (time difference of arrival) positioning, and provides an ultrasonic three-dimensional positioning method based on beam enhancement and TDOA, which comprises the following steps: extracting initial space parameters based on beam scanning of an array receiving signal, carrying out iterative optimization on beam weight to adjust a direct wave component and suppress reflection interference, constructing a closed-loop optimization mechanism, and carrying out beam enhancement and TDOA positioning. Calculating an enhanced signal and an array element reliability measurement index through frequency domain segmentation and energy normalization; forming an optimization array based on the array element reliability measurement index, extracting a time delay parameter from the optimization array, constructing a distance measurement equation set, and calculating an initial estimation value of a target position by adopting a weighted optimization algorithm; and constructing a residual error model, constructing an optimized weight matrix by combining an array element reliability measurement index and a signal quality index, iteratively calculating a target coordinate until a convergence condition is met, and outputting a final three-dimensional coordinate. According to the method, the comprehensive performance of ultrasonic three-dimensional positioning in the aspects of anti-interference performance, stability and positioning precision in a complex environment is improved, and error source control is realized.

The invention discloses a statistical result-based X-band phased array weather radar multi-beam scanning mode observation error calibration method and system. The method comprises the following steps of: S1, acquiring observation base data of an S-band dual-polarization Doppler weather radar and an X-band dual-polarization phased array weather radar as initial data; s2, performing data quality control on the radar-based data to obtain preprocessed data; and S3, by adopting a different radar time and space sampling volume coordinate matching method and taking an observation value of the S-band radar as a reference, counting a matching difference of the preprocessed data to obtain an observation error of the X-band radar and correcting the observation error.

The invention discloses an SSPP leaky-wave antenna and a design method thereof, and belongs to the technical field of wireless communication, and the antenna comprises a dielectric substrate, and a positive microstrip line and a negative microstrip line which are correspondingly arranged on the upper surface and the lower surface of the dielectric substrate; the positive microstrip line and the negative microstrip line are respectively symmetrical about two current transmission ends; and the SSPP structure of the middle section of the positive microstrip line and the SSPP structure of the middle section of the negative microstrip line are arranged in a way that the groove openings are opposite to each other. According to the invention, high-gain signal radiation and multi-angle beam scanning can be realized.

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

The invention discloses an array antenna phase-only real-time beam scanning and side lobe control method based on machine learning. Firstly, array geometry, scanning angles and minor lobe indexes are set; and then, array element excitation phases meeting requirements are rapidly synthesized by using a phase-only fast Fourier FFT (Fast Fourier Transform) algorithm. Constructing a training data set by taking the scanning angle and the minor lobe index as input and the corresponding phase distribution as output; training a neural network by using the data set to obtain a real-time prediction model from initial excitation distribution to accurate excitation distribution; and according to a target expected directional diagram scanning angle and a sidelobe feature, inputting the scanning angle and the sidelobe feature into a neural network to predict and obtain an array element excitation phase so as to realize a real-time phase-only beam and sidelobe control function. Input dimensions are reduced by extracting key features of a directional diagram, data generation is accelerated by means of FFT, real-time performance and precision are both considered, and the method is suitable for fast beam scheduling tasks of various array antennas.

The invention discloses a laser processing device, a silicon carbide crystal ingot cutting method and a laser processing system. The laser processing device comprises a laser used for emitting Gaussian beams with preset laser parameters; the beam shaping element is used for shaping the Gaussian beam into a linear beam; and the scanning mechanism is used for focusing the linear light beam and cutting the silicon carbide crystal ingot by utilizing the focused linear light beam according to a preset cutting path and a preset cutting speed. Compared with the focused Gaussian beam, the focused linear beam has a small spot size in the direction of the optical axis, which means that the action depth of the focused linear beam in the silicon carbide crystal ingot is shallower, so that the length of the growth area of the microcracks generated in the direction of the optical axis in the machining process is reduced, and the machining precision is improved. And therefore, the roughness generated on the surface of the silicon carbide wafer is reduced, and the quality of the silicon carbide wafer is improved.

The invention relates to a super-resolution fluorescence lifetime microscopic imaging method and system based on pixel relocation. The method comprises the following steps: S1, carrying out multi-focus parallel scanning on a sample by using an acousto-optic deflector; s2, synchronously collecting a fluorescence intensity image and fluorescence lifetime data through an area array detector and a point detector; and S3, carrying out super-resolution reconstruction on the fluorescence intensity image based on a pixel relocation algorithm, and mapping fluorescence lifetime data to a reconstructed image to generate a super-resolution fluorescence lifetime microscopic image. According to the invention, an AOD is adopted to replace a scanning galvanometer in a traditional TCSPC-FLIM imaging system as a light beam scanner; addressing scanning of AOD, image acquisition of EMCCD and life data acquisition of PMT and TCSPC cards are closely linked by combining well-designed multiple paths of synchronizing signals, and fluorescence life data are distributed to each dot matrix through a later data processing method, so that organic combination of super-resolution and FLIM can be realized without complicated equipment, and SR-FLIM images of samples are obtained.

The invention provides a multifunctional satellite-borne integrated radio frequency system and device. The multifunctional satellite-borne integrated radio frequency system comprises a broadband low-profile integrated transceiver array, a reconfigurable integrated radio frequency front end and a flexible high-performance processing platform, the broadband low-profile integrated transceiving array adopts a multi-subarray design, has the capabilities of multi-beam signal transceiving, two-dimensional wide-angle beam scanning and received signal low-noise amplification, and adopts a low-profile and foldable structural design to adapt to the constraint of a satellite-borne platform; the reconfigurable integrated radio frequency front end has the capabilities of full-band signal up-down conversion processing and multi-channel full-interaction radio frequency routing; the flexible high-performance processing platform adopts a reconfigurable, open-type and high-reliability digital processing architecture, and has the functions of intermediate-frequency signal high-speed sampling, high-performance digital processing, software definition and on-orbit dynamic upgrading. According to the invention, a traditional discrete satellite-borne radio frequency system can be converted into a high-integration, multifunctional and conformal system, and the scale of the satellite-borne radio frequency system can be effectively reduced.

The present application relates to the field of beam scanning technology and provides a galvanometer motor and a LiDAR. The galvanometer motor includes a stator assembly, a rotor assembly, a tunneling magnetoresistance sensor, a first magnet, and a second magnet. The stator assembly includes a housing and a stator body, while the rotor assembly includes a rotating shaft, a rotor magnet, and an angle limiting member. The rotating shaft is rotatably mounted in the housing around a first shaft line, with a gap between the rotor magnet and the stator body. The rotor magnet rotates around the first shaft line under the magnetic field of the stator body. The tunneling magnetoresistance sensor can map the limited angles formed by the first angle and the second angle into finite position codes.

Implementations disclosed describe, among other things, a system and a method of scanning a substrate with a beam of light and detecting for each of a set of locations of the substrate, a respective one of a set of intensity values associated with a beam of light reflected from (or transmitted through) the substrate. The detected intensity values are used to determine a profile of a thickness of the substrate.

The invention discloses a satellite beam scanning scheduling method and device and a storage medium. The method belongs to the field of satellite communication, and comprises the following steps: acquiring parameter characteristics of coverage areas of multiple beams of a satellite; inputting the parameter features into a pre-trained neural network model, and determining sub-bands adapted to the plurality of beams through the neural network model; a chromosome vector is initialized, an initial population is constructed, and the chromosome vector is used for indicating the beam position scanned by each beam of the satellite in each beam hopping time slot of the beam hopping period; constructing a fitness function; performing iterative optimization on the initial population according to a genetic algorithm, and determining an optimal chromosome vector; and according to the optimal chromosome vector, determining the beam position scanned by each beam in each beam hopping time slot of the beam hopping period. Therefore, coverage overlapping and sidelobe leakage interference of same-frequency beams are avoided to the maximum extent from the scanning time sequence dimension, and dual targets of sub-band adaptation and interference suppression are synchronously achieved.

The invention, which relates to the technical field of the radar system, discloses a swash plate machine phase-sweeping radan installation angle adaptive correction method comprising the following steps: acquiring three-axis attitude angle data of an installation reference surface, and synchronously acquiring azimuth angle rotation data of a radar antenna; based on the three-axis attitude angle data of the installation reference surface, establishing a coordinate transformation matrix from a radar antenna coordinate system to an inertial coordinate system, and mapping the three-axis attitude angle data of the installation reference surface to the inertial coordinate system; obtaining a beam scanning conical surface deviation angle according to the coordinate transformation matrix and azimuth angle rotation data of the radar antenna; generating antenna attitude correction according to the beam scanning conical surface deviation angle; and inputting the antenna attitude correction quantity into an antenna driving controller, adjusting the attitude of two axes of pitching and orientation of the antenna, and compensating the beam scanning conical surface deviation. According to the method, the precise coordinate transformation matrix and the angle difference compensation model are established, and the inertial measurement unit and a closed-loop feedback control mechanism are combined, so that the self-adaptive real-time correction of the mounting angle is realized.

The invention provides a full-airspace multi-beam phased-array antenna, and the phased-array antenna comprises a structural frame which is provided with a plurality of antenna array plane installation frames and is internally provided with a cavity; the plurality of antenna array surfaces are respectively and obliquely arranged on the antenna array surface mounting frame body; a radio frequency assembly unit which is vertically interconnected with the antenna array plane; the control unit, the switch matrix, the receiver and the power supply module are all located in the cavity, and the control unit is in communication connection with the radio frequency assembly unit; the switch matrix is connected with the radio frequency assembly unit and the baseband; the receiver is connected with the switch matrix and is in communication connection with the control unit; the power module is connected with the control unit. By adopting the array plane inclined layout, tracking of multiple targets in the same frequency band or tracking of multiple targets in different frequency bands is achieved, then the wave beam scanning and tracking range of 0-360 degrees in the azimuth and 2-90 degrees in the pitching direction is achieved, the modular design is adopted, and the technical effects of being convenient to install and operate are achieved.

A metasurface array comprises a plurality of electronic control metasurface units, and each electronic control metasurface unit comprises a patch layer, a first dielectric substrate layer, a floor layer, a bonding layer, a second dielectric substrate layer and a bias line layer from top to bottom; the patch layer comprises four square double-ring metal patch structures and a dipole arm structure provided with a pin diode, a central metal through hole penetrating downwards to be connected with the offset line layer is formed in the crossed position, and corresponding to the diameter of the central metal through hole, only the diameter of an opening in the floor layer is large, and the other layers are the same; a peripheral metal blind hole penetrating through the first dielectric substrate layer is downwards formed in the central point of each square double-ring metal patch structure; the bias line layer is of a fan-shaped branch knot structure; under the cooperation of the feed source antenna, the electric control metasurface unit realizes the on-off of a pin diode through phase distribution coding under the control of the direct current control circuit board and the ARDUINO microprocessor, and realizes beam scanning in a specified direction. The antenna is wide in frequency band and low in cost.

The invention relates to the technical field of spaceflight measurement and control phased-array antennas, aims to solve the problems that an existing antenna is few in tracking measurement and control flying targets and limited in beam scanning range, and provides a planar subarray distributed omnidirectional phased-array antenna which comprises an antenna framework, a wave control system and a plurality of antenna subarrays. The antenna framework is provided with a plurality of windows, each window is internally provided with an antenna sub-array, and the windows are matched with the antenna sub-arrays; each antenna sub-array comprises a beam forming network, a duplexer, a multi-channel TR, a signal processing module and n * n antenna array elements arranged in an array, and n is an integer greater than or equal to 2; the wave control system is arranged in the antenna skeleton and is used for performing in-phase superposition on signal energy of each antenna array element in different target projection areas on an expected point and performing phase-shifting shunt control to realize full-airspace multi-beam signal receiving and transmitting; the omnidirectional phased-array antenna is wide in beam scanning range and can realize multi-target measurement and control.

A flying-over beam pattern scanning hologram microscope device includes: a scan beam generation unit which converts a first beam and a second beam to a first spherical wave and a second spherical wave, and then allows the first and second spherical waves to interfere with each other to form a scan beam; a scanning unit, which comprises a scan mirror for controlling the scan beam in the horizontal direction, and a translation stage for moving an object in the vertical direction at the rear end of the projection unit; the projection unit projecting the scan beam onto an object plane; and a light collection unit for detecting a beam that has passed through the objective lens again after fluorescing or being reflected from an object.

The invention relates to the technical field of wireless communication and sensing, and particularly discloses a holographic amplitude weighting-based two-dimensional antenna array multi-beam scanning method, which comprises the following steps of: determining the position information of each radiation unit in a two-dimensional antenna array, including calculating the interval and the arrangement mode of the units; an amplitude weighted value of each radiation unit is generated according to the target wave direction, a two-dimensional multi-beam holographic amplitude weighting technology is used, and the radiation unit amplitude weighted values are determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating a corresponding binary discretization coding sequence based on the amplitude weighted value so as to control the excitation amplitude of each radiation unit; and designing a liquid crystal-based Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array, and regulating and controlling a radiation pattern of a two-dimensional antenna array through the coding sequence to realize multi-beam scanning.

The invention provides a beam scanning device, and the device comprises an antenna module, the antenna module comprises S antenna arrays, and S is an integer greater than 1; a coverage area of the satellite communication system is divided into S sub-areas according to quadrants, and each antenna array is used for carrying out beam scanning on one sub-area. The invention also provides an antenna array determination method and a satellite communication system. The technical problem of how to realize large-angle beam scanning by a satellite communication system is at least solved.

The invention discloses an intelligent adaptive metasurface and an electromagnetic regulation and control method. The metasurface unit is of a three-layer composite structure and comprises a programmable phase shifter, a slot antenna and a coupling circuit, and real-time sensing of amplitude and phase information of incident electromagnetic waves and 0-360-degree continuous regulation and control of reflection phases are achieved. The array is composed of 6 * 6 independent control units and supports + / -60-degree beam scanning and high-precision direction of arrival estimation (error lt; 1 degree). Channel state information is obtained through a coupling link, a coding matrix is dynamically optimized in combination with a closed-loop feedback algorithm, and the communication quality is improved in a complex environment. Experiments show that the metasurface respectively brings 16dB, 19dB and 8dB channel gains in ideal, non-line-of-sight and real scenes, the problems that a traditional metasurface is poor in environmental adaptability and insufficient in phase precision are solved, and an innovative hardware platform is provided for 6G communication, an intelligent reflecting surface and a radar sensing system.

The technology described herein is directed towards a transceiver with beam scanning capability based on leaky wave antenna technology and substrate integrated waveguide technology, along with a metallic covering that determines which direction the antenna radiates signals. The leaky wave antenna can include different respective groups of slot pairs having different respective periodicities, corresponding to different respective beam steering directions. One or more metallic covers can be used to cover some of the slot pair sections, such that the sections under cover behave like a conventional substrate integrated waveguide and the exposed section(s) behave like conventional leaky wave antennas. The metallic covers can be moved as desired, such as attached via magnets. The transceiver can thus steer signals to a wearable or portable device that includes a passive metasurface while mitigating null regions. The slot pairs can be asymmetrical reflection-canceling slot pairs, to achieve broadside radiation while avoiding band-stop effects.

Disclosed are an antenna unit, an antenna array, a beam scanning method, a communication apparatus, and a computer-readable storage medium. The antenna unit includes a microstrip patch antenna and a phase shifter. The phase shifter includes: a microstrip line; a liquid crystal layer, arranged between the microstrip line and the microstrip patch antenna; and a metal layer, arranged between the liquid crystal layer and the microstrip patch antenna, where a first through hole is formed in the metal layer, and the output ends of the microstrip patch antenna and the microstrip line are coupled by means of the first through hole. The antenna unit capable of implementing beam phase change is simple in structure, low in manufacturing cost, and small in weight, can be manufactured into a planar structure, and is low in profile, easy to process, easy to downsize, convenient to carry, and convenient to integrate.

The invention belongs to the technical field of ultrasonic nondestructive testing, and relates to a pipeline defect quantitative detection method and system based on an annular ultrasonic phased array, and the method comprises the following steps: carrying out sound beam scanning on the inner wall of a pipeline based on the annular ultrasonic phased array; sound beams are controlled to be propagated in the pipeline at different incident angles, and the incident sound waves at different angles interact with the defect to generate defect echo signal information; and detecting the defect depth and the circumferential and axial defect sizes according to the defect echo signal information. The system comprises an acoustic beam scanning module, a defect echo signal information generation module and a detection module. According to the method and the system, the pipeline can be subjected to defect detection and long-time monitoring through single equipment, meanwhile, the potential defects of the pipeline can be quantitatively detected without replacing the equipment, and the operation is simple.

The invention discloses a circularly polarized dielectric resonator two-dimensional beam scanning phased-array antenna based on liquid crystal, and belongs to the technical field of microwave antennas. The antenna comprises an elliptic cylindrical dielectric resonator radiation structure, a sequential rotation feed network and a liquid crystal phase shifter structure based on a glass plate, wherein the elliptic cylindrical dielectric resonator radiation structure and the sequential rotation feed network are arranged on a flexible printed circuit board (FPC); the radiation structure and the feed network which are arranged on the FPC comprise a radiation unit, an FPC layer and a feed network; the liquid crystal phase shifter comprises a glass dielectric substrate, a liquid crystal layer, an inverted spiral microstrip line and a bias network; the elliptic cylindrical dielectric resonator radiation structure realizes wide impedance bandwidth and wide axial ratio bandwidth; the antenna array also uses a sequential rotation method, the axial ratio characteristic of the phased-array antenna is further improved, and the coupling feed structure is simplified by using the design that the L-shaped microstrip line is connected with the inverted spiral microstrip line after sequential rotation.

The invention discloses an image denoising device based on adaptive local enhancement and dynamic multi-scale dependent fusion, and the device comprises a data preprocessing module which is used for carrying out the pixel normalization processing, color space conversion and size and resolution adjustment of a to-be-denoised image, and obtaining a standard image; the adaptive local convolution enhancement module dynamically adjusts a receptive field of a convolution kernel according to noise characteristics on the standard image, and extracts an original feature map on the standard image; the long and short term dependency modeling module based on beam scanning captures long and short term dependency on the original feature map by using a beam scanning technology, and fuses the long and short term dependency with a standard image to obtain a preliminary de-noised feature map; the multi-level representation information extraction module is used for extracting deep-level de-noising feature maps of different scales in the preliminary de-noising feature maps; and the refined reconstruction module carries out fusion and refined reconstruction on the original feature map and the deep denoising feature map, and outputs a noiseless image. According to the invention, efficient and accurate image denoising processing can be realized.

The invention discloses a satellite beam scanning scheduling method and device for preventing same-frequency interference and a storage medium. The method belongs to the field of satellite communication, and comprises the following steps: determining sub-bands respectively adapted to a plurality of beams of a satellite; initializing a particle swarm, wherein each element of a particle vector of the particle swarm indicates a beam position scanned by each beam of the satellite in each beam hopping time slot of a beam hopping period through different numerical intervals; a fitness function is constructed, and the function value of the fitness function is related to the severity of the same-frequency interference in the satellite coverage area; performing iterative optimization on the particle swarm according to a particle swarm optimization algorithm, and determining an optimal particle vector; and according to the optimal particle vector, determining the beam position scanned by each beam in each beam hopping time slot of the beam hopping period. According to the invention, by optimizing the beam position scanning scheduling scheme of the beam in the beam hopping period, the coverage overlapping and signal cross interference of adjacent same-frequency sub-beams are effectively avoided.

Aspects of the present disclosure provide techniques and apparatus for enabling network power savings using keep-alive signaling in idle mode. When a network is in an idle mode, a network entity may send a keep-alive signal (KAS) to reduce energy consumption of the network. In some aspects, the KAS may be a simplified synchronization signal block (SSB) that is transmitted more frequently than a complete SSB. In some aspects, the KAS may have a different beam scanning pattern and / or beam width than the complete SSB.

The invention provides an electric control beam scanning leaky-wave antenna and communication equipment, and the leaky-wave antenna comprises a gap waveguide which comprises a strip-shaped ridge, the gap waveguide is used for transmitting electromagnetic waves in a traveling wave manner, and the strip-shaped ridge extends in the transmission direction of the electromagnetic waves and is arranged in the gap waveguide; the plurality of radiation units are arranged on the side wall of the gap waveguide, each radiation unit comprises a radiation slot and an electric control switch, and the radiation slots are used for leaking electromagnetic waves in the gap waveguide to a free space to form wave beams; and the electric control switch is used for controlling the working state of the radiation slot so as to realize beam scanning. According to the leaky-wave antenna provided by the invention, the beam tilt characteristic of the antenna can be improved, and the communication quality of the antenna is improved.