199 results about "Aperture array" patented technology

The invention relates to an optical fiber hydrogen sensor based on a silver film-nanowire hole array structure and a preparation method thereof in the field of photochemical sensors. The optical fiber hydrogen sensor comprises a multimode optical fiber, and a sensing area is formed on the multimode optical fiber; the sensing area is formed by stripping a coating layer with a preset length from the multimode optical fiber, thinning the optical fiber in the area, plating a silver film on the surface of the thinned optical fiber, and adsorbing a nanowire hole array structure which is sequentially and vertically arranged on the surface of the silver film in a liquid level self-assembly manner; the nanowire hole array is of a metal-medium-metal (MIM) structure, a gold-palladium nanowire array is arranged at the bottom, an intermediate medium layer is made of aluminum oxide, and a silver film with a hole array in any shape is arranged at the top. When light is transmitted to a sensing area from a fiber core of the multimode optical fiber, the light and a metal silver film can excite a surface plasmon resonance (SPR) effect, meanwhile, an MIM structure formed by a gold-palladium nanowire, an aluminum oxide dielectric layer and a porous silver film serves as an optical coupling antenna through a local surface plasmon resonance (LSPR) effect at the edge of a top hole, and the optical coupling antenna is used for transmitting the light to the sensing area. Light energy is efficiently converged and excited in an extremely bound gap plasmon (Gap Plasmon) in an aluminum oxide dielectric layer, so that far-unconventional electromagnetic field enhancement is generated in a sensing core area, and the sensitivity of the sensor is greatly improved.

A rapid-deployment satellite communications (satcom) terminal apparatus includes a base capable of rotation relative to a platform (e.g., a mobile platform or trailer to which the apparatus may be mounted or from which it may be detached), and a passive planar array panel comprising an array of antenna elements or apertures, the passive planar array panel pivotably and slidably attached to the base. The passive planar array panel includes a feed arm and feed antenna, the arm articulable relative to the panel and the antenna articulable relative to the arm. The feed antenna transmits and / or receives EM energy focused by the antenna elements in a beam direction adjustable by an array controller to a desired azimuth and elevation via electromechanical adjustment of, respectively, the rotational orientation of the base and the slant angle of the passive planar array panel relative to the platform.

The present invention is a common optical path compound eye optical system based on hexagonal annular arrangement, which solves the problems of small sub-aperture, low space utilization, narrow imaging spectrum range, insufficient integration of multi-band system, and inconsistent information collection in existing bionic compound eye optical systems. The system includes a curved multi-aperture array, an optical relay image receiving system, and an infrared two-color detector arranged in sequence; the curved multi-aperture array adopts a hexagonal annular arrangement, and the optical parameters of each sub-aperture unit are the same; the optical relay image receiving system is used to convert the focal curved surface image information obtained by the curved multi-aperture array into focal plane image information, which is then received by the plane detector; the infrared two-color detector is used to receive the dual-band image information collected by the sub-aperture units at different spatial positions; wherein the sub-aperture optical system and the relay image receiving system both adopt a dual-band common optical path imaging structure.

The invention relates to the technical field of underwater acoustic signal processing in a sonar system, in particular to a large-aperture array robust adaptive waveform recovery method based on focusing covariance sparse reconstruction, and the method comprises the steps: carrying out the time-frequency transformation of all array element receiving time domain data, and obtaining array element domain-frequency domain data; constructing sampling covariance matrixes corresponding to different frequency points according to the array element domain-frequency domain data; constructing a multi-frequency-point focusing covariance matrix according to the sampling covariance matrix and the array manifold vector corresponding to each frequency point; constructing a sparse dictionary matrix adaptive to the focusing covariance matrix according to the linear relation between the focusing covariances of the frequency points, and obtaining a sparse expression of the focusing covariance matrix; according to the sparse representation form of the focusing covariance matrix, utilizing a sparse criterion to carry out iterative reconstruction on the focusing covariance matrix; and robust adaptive waveform recovery is carried out by using the focusing covariance matrix after sparse iteration reconstruction. According to the method, the short-time adaptive waveform recovery performance of the large-aperture array is remarkably improved.

The invention belongs to the technical field of antennas, discloses a double-frequency common-caliber high-isolation phased-array antenna in a sparse array distribution mode, and mainly solves the problems that an existing double-frequency common-caliber array antenna sparse distribution optimization algorithm is large in calculation amount and low in design efficiency. According to the invention, through the thirteen-sided Einstein pattern, aperiodic tiling of an infinite plane can be realized through a certain splicing rule. A Ka-band high-frequency antenna and a K-band low-frequency antenna are placed at the gravity center of the Einstein pattern, and the high-frequency antenna and the low-frequency antenna are distributed in a staggered mode in a translation mode. The antenna unit adopts a cross symmetric array antenna, and high isolation of the dual-frequency antenna unit is realized by loading a coaxial filter at the bottom of the antenna unit. The rear end of each antenna unit is connected with a T / R assembly, and array beam scanning is realized by controlling the amplitude and phase of an input signal. The method is low in arrangement cost and high in design efficiency, and can be used for radar, communication, navigation and information confrontation.

The ball is a thin-walled hollow sphere that includes an array of apertures with dimples in a pattern that are concentric to the aperture array. Dimples are provided on the exterior surface of the ball between the apertures with the pattern and dimensions of the dimples varying based on proximity to the apertures. Internal protuberances are provided on the interior surface of the hollow ball such that the interior surface also manages aerodynamic airflow through the ball. Channels are also provided around each of the apertures within the ball which may intersect proximate dimples or be spaced therefrom. The ball also includes apertures having converging and diverging sidewalls that form a venturi shape to increase inflow air into the apertures and outflow air out of the apertures. Finally, the ball also maintains a weight:diameter ratio within a fixed range.

A charged particle device projects charged-particle beams along beampaths towards a sample location. The device comprises: a charged-particle lens assembly for manipulating the beams and a controller. The lens assembly comprises plates each having an aperture array for passage of beampaths. The plates are at different plate locations along the beampaths. The controller controls the charged-particle device such that charged particles of the beams have different energy values at the different plate locations along the beampaths. The lens assembly comprises a corrector comprising an individual correctors configured to perform aberration correction at respective apertures independently of each other. The corrector is associated with the plate at the plate location at which the energy value is smallest, the strength of an electric field adjacent to the plate is greatest and / or a ratio of the energy value to strength of an electric field adjacent to the plate is smallest.

The invention discloses a distributed aperture OPA array co-phase system based on a phase measurement chip, and belongs to the field of laser radars, the output end of a laser generating device is connected with an optical fiber beam splitter, output laser is divided into two paths, one path is a main light path, and the other path is a reference light path; after being amplified by the optical fiber amplifier, the main optical path laser is equally divided into N paths by the optical fiber beam splitter, and each path of sub light beam enters the integrated optical chip through the optical fiber-waveguide coupler and is emitted through the OPA module; the reference light path laser enters the phase identification twin chip through the optical fiber-waveguide coupler; and an on-chip interference result is fed back to the phase measurement compensation module, and active measurement and real-time correction are performed on a phase error by adopting an in-waveguide co-phase synthesis technology. According to the invention, a plurality of main laser non-common-path phase error measurement methods are used, and the overall emission aperture, emission power and detection distance of the laser phased array are greatly improved in a multi-aperture cooperative coherence mode.

The invention provides a dual-band oblique polarization common-caliber array antenna based on a tight coupling effect. The dual-band oblique polarization common-caliber array antenna comprises a dielectric substrate, a low-frequency antenna, a high-frequency antenna and a metal floor which are perpendicular to one another, the low-frequency antenna comprises a low-frequency modification dipole, a low-frequency feed balun and a low-frequency metal wide-angle impedance matching layer, and the high-frequency antenna comprises a high-frequency modification dipole, a high-frequency feed balun and a high-frequency metal wide-angle impedance matching layer. The design of the common-caliber array antenna is realized in a mode that the dual-band antenna is vertically inserted and the metal floor is shared. The antenna has the advantages of ultra wide band, beam scanning and oblique polarization, and can be used for broadband radar wireless communication.

The invention provides a deep-sea large-aperture array deconvolution near-field high-precision direction finding method based on sound velocity correction. According to the method, an equivalent sound velocity mapping table generated by a BELLHOP ray model is established, a sound ray bending effect is innovatively converted into a real-time table look-up correction mechanism, sound velocity correction time delay is injected in beam forming and deconvolution calculation, the problem of PSF distortion of a traditional linear model in a deep sea near field is thoroughly solved, high-precision direction finding and distance measuring are achieved, and the accuracy of direction finding and distance measuring is improved. And a subversive direction finding solution with physical accuracy, algorithm stability and engineering real-time performance is provided for the deep-sea large-aperture array.

The invention discloses a low-frequency sound source three-dimensional passive positioning method for a deep-sea small-aperture array, and belongs to the technical field of ocean engineering, underwater acoustic engineering, array signal processing and sonar technologies, and the method comprises the following steps: S1, setting initial parameters of the small-aperture array; s2, carrying out super-directivity azimuth estimation on the small-aperture array; s3, performing super-directivity matching field positioning by using the small-aperture array; s4, estimating the target depth by using estimation results of S2 and S3 and a small-aperture array beam output result; according to the method, the limitation that a conventional scalar array cannot obtain the target azimuth, distance and depth information at the same time under the condition of a smaller array aperture is broken through, the target azimuth and distance information can be obtained at the same time with a smaller aperture, the target depth information is obtained according to the known target azimuth and distance information, the method has better azimuth estimation performance, and the method is suitable for being used in a large scale. And the device is convenient to lay and recycle, wider in application range and lower in cost.

A telecentric charged particle beam, which can be an electron beam, is directed through an array of apertures to divide the telecentric charged particle beam to a plurality of telecentric illumination beamlets. The telecentric illumination beamlets through an imaging lens, a field lens at an intermediate image plane, and a transfer lens. The telecentric illumination beamlets are scanned as the telecentric illumination beamlets are directed through an upper scan deflector and a lower scan deflector and directed onto a workpiece on a stage.

Ultra-wideband (UWB) arrays that are fully planar are provided. Fully-planar inverted-L element (FILE) arrays that are tightly coupled arrays (TCAs) can realize UWB tightly coupled apertures in the W and higher millimeter wave (mmWave) bands. The unit cell architecture of the FILE array, (which can have any desired size, can be comprised of an inverted-L shaped antenna and a capacitively coupled via-fence.

The invention relates to the technical field of image processing, in particular to an implicit nerve-guided super-network blind light field image quality evaluation method, which comprises the following steps: acquiring a to-be-evaluated light field sub-aperture array image; extracting target Y channel information of the light field sub-aperture array image; the target Y channel information is input into a preset quality evaluation model, a perception quality evaluation result is output, and the quality evaluation model uses an implicit neural guidance network to extract high-dimensional features of the Y channel information and obtains a perception quality score according to the high-dimensional features. According to the method, through a representation form extracted from a light field sub-aperture image stack, high-dimensional feature representation is obtained by using an implicit neural guidance network. In addition, a multi-scale semantic feature extraction network is combined, a perception quality score is finally generated, visual characteristics of human eyes are fully considered, and the scoring accuracy and effect of non-reference light field image quality evaluation are remarkably improved.

Various arrangements of transmit and receive shared-aperture array antenna systems are presented herein. The arrangements can include an antenna that includes: a planar substrate; a first row of a first plurality of transmit patches arranged on the planar substrate; a second row of a plurality of receive patches arranged on the planar substrate; and a third row of a second plurality of transmit patches arranged on the planar substrate. The first row, second row, and third row can be parallel and the second row can be between the first row and the third row.

The embodiment of the invention discloses an orientation estimation method, device and system for leakage noise of a water supply network. The method comprises the following steps: acquiring an acoustic signal acquired by a positioning array, wherein the array element spacing of the positioning array is smaller than half-wavelength; the method comprises the following steps of: extracting a main frequency band of each channel signal in an acoustic signal by utilizing power spectral density based on the channel signal acquired by each array element in the acoustic signal; the method includes determining an adaptive dominant frequency band of an acoustic signal based on dominant frequency bands of all channel signals in the acoustic signal. Furthermore, the method includes estimating the orientation of the leakage noise by using a beamforming algorithm based on the acoustic signal and its adaptive dominant frequency band. In this way, according to the embodiment of the invention, the small-aperture array can be used for replacing a leakage listening rod to collect the sound signals of the pipe network, the frequency component with the high signal-to-noise ratio in the self-adaptive main frequency band is screened out from the sound signals, and then high-resolution orientation estimation is achieved through the beam forming algorithm.

The invention relates to a light field image space angle joint reconstruction method. The method comprises the following steps: extracting Y channel information of a light field sub-aperture image array with low angle resolution and low space resolution; performing feature reconstruction on the extracted Y channel information to obtain Y channel information of the light field sub-aperture image array with high angular resolution and high spatial resolution; acquiring U channel information and V channel information of the light field sub-aperture array image with high angular resolution and high spatial resolution; and combining the Y channel information after feature reconstruction with the U and V channel information of the light field sub-aperture array image with the high angle resolution and the high spatial resolution, and converting the combined data into an RGB space to obtain an RGB image of the light field sub-aperture array image with the high angle resolution and the high spatial resolution. According to the method, high-quality light field sub-aperture array images with high angle resolution and high spatial resolution can be obtained, and the requirements of applications such as three-dimensional reconstruction, virtual reality and depth estimation are met.

Embodiments of the present application provide a base station antenna and a base station. The base station antenna comprises a first antenna array, a metasurface lens, and a second antenna array; the metasurface lens is located between the second antenna array and a first radiator of a radiation unit of the first antenna array; and the metasurface lens is used for reflecting radiation signals of the first antenna array, and performing wavefront phase regulation and transmission on radiation signals of the second antenna array, so that the radiation signals of the second antenna array penetrating through the metasurface lens are approximately focused into plane waves. The base station comprises the base station antenna. According to the solution, shared-aperture array antennas can be achieved, the defects of mutual shielding of antennas and mutual interference of antenna performance are avoided, the problem of structural interference can be avoided, and the antenna gain can be improved.

The invention relates to a mobile dipole sound source positioning device and method of a minimum aperture array, the device comprises a vector sound transmission array and a processor, the vector sound transmission array comprises at least three array elements, the distance between the array elements is 1 / 6 lambda, lambda is the wavelength, the vector sound transmission array is used for measuring sound pressure signals, the processor is used for processing the sound pressure signals, and the processor is used for processing the sound pressure signals. And a positioning result of the dipole source is solved through a nonlinear optimization algorithm. The method comprises the following steps: measuring a sound pressure signal within a preset time by using a vector sound transmission array, and converting a measured time domain sound pressure signal into a frequency domain sound pressure signal; calculating a vibration velocity signal according to the frequency domain sound pressure signal, and establishing a dipole sound source propagation model; and performing nonlinear optimization solution on the dipole sound source propagation model to obtain a positioning result of the dipole source. Compared with the prior art, high-precision and real-time positioning of the moving dipole source can be realized.

A phase-difference-based high-resolution azimuth estimation algorithm for a small-aperture array with multiple targets comprises the following steps: 1) according to various array structures, the coordinate vectors of the array elements are subtracted and then combined accordingly to obtain new vectors along each coordinate axis; 2) the phase of each array element is obtained by performing a fast Fourier transform on the array element sampling data, the phase difference between the array elements is obtained by subtracting the phase of each array element, and the phase differences are combined according to the combination of the array element coordinate vector differences to extract the component k of the incident direction along each coordinate axis. x , k y and k z 3) After obtaining the various components of the incident direction, the unambiguous incident angle across the entire spatial range is calculated using inverse trigonometric functions. This invention utilizes a combination of array element sampling data to achieve more accurate target direction estimation, enhances resistance to noise and other interference, and broadens the applicable frequency band, enabling flexible application to various arrays, as well as direction estimation using multi-line spectrum signals and broadband signals.

A rapid-deployment satellite communications (satcom) terminal apparatus includes a base capable of rotation relative to a platform (e.g., a mobile platform or trailer to which the apparatus may be mounted or from which it may be detached), and a passive planar array panel comprising an array of antenna elements or apertures, the passive planar array panel pivotably and slidably attached to the base. The passive planar array panel includes a feed arm and feed antenna, the arm articulable relative to the panel and the antenna articulable relative to the arm. The feed antenna transmits and / or receives EM energy focused by the antenna elements in a beam direction adjustable by an array controller to a desired azimuth and elevation via electromechanical adjustment of, respectively, the rotational orientation of the base and the slant angle of the passive planar array panel relative to the platform.

The aperture array includes a plurality of apertures arranged in one or more dimensions. Each aperture is configured to receive a respective portion of the received light wavefront. Each aperture is coupled to a respective optical mixer that coherently interferes the respective portion of the received light wavefront with a respective local oscillator light wave. The processing module is configured to process the electrical signals detected from the outputs of the optical mixers, including: for each optical mixer, determining at least one phase or amplitude information based on at least one electrical signal detected from at least one output of the optical mixer; determining direction-based information associated with a subset of the field of view based on the phase or amplitude information from at least two of the plurality of optical mixers; and determining distance information based on the direction-based information.

The invention discloses an X / Ku frequency band high-isolation heterogeneous common-caliber array antenna applied to satellite communication, and belongs to the technical field of common-caliber antennas. The heterogeneous common-caliber antenna comprises a parasitic patch layer, a first heterogeneous dielectric layer, a radiation patch layer, a second heterogeneous dielectric layer, a first grounding plane, a first dielectric layer, a feed network layer, a second dielectric layer, a second grounding plane and a coaxial line which are tightly attached in sequence from top to bottom. According to the heterogeneous common-caliber antenna, the X-waveband antenna and the Ku-waveband antenna share the same caliber face, the X-waveband antenna and the Ku-waveband antenna are heterogeneous in a medium nesting mode, the isolation degree of the two kinds of antennas in the same caliber face is very high, receiving and sending work can be conducted at the same time, and the miniaturization effect is outstanding; the array formation based on the heterogeneous common-caliber antenna can realize the simultaneous work of the X / Ku frequency band antennas under the half-wavelength spacing of the Ku frequency band, and the radiation performance is hardly influenced.

The present invention discloses an L\S band dual-frequency common aperture filter antenna array and communication equipment, belonging to the field of communication antennas. The antenna array includes: a metal floor; a plurality of array-arranged magnetic resonance near-field parasitic filter antennas, including a dielectric substrate four, an L-shaped radiation metal strip arranged on an end face of the dielectric substrate four, a parasitic semi-circular metal strip and a coaxial device A; and a plurality of microstrip filter antennas, including a dielectric substrate three arranged on the metal floor, a dielectric substrate two arranged parallel to the dielectric substrate three, a parasitic metal patch, a coaxial device B and a Y-shaped radiation metal strip. The antenna array of the present invention can effectively reduce the hetero-frequency coupling between L\S band antennas by utilizing the filtering characteristics, and the L\S band antennas are compactly arranged by combining vertical and horizontal placement, and antenna units of different operating frequencies will not generate shielding and coupling, while realizing the compact and miniaturized layout of the common aperture array.

A multi-aperture array for manipulating a plurality of charged first single-particle beams, comprising: a base body with a plurality of apertures, wherein, during operation of the multi-aperture array, one of the charged first single-particle beams passes through each aperture; at least a plurality of first electrodes, wherein one of the first electrodes is arranged at each of the apertures to individually influence the first single-particle beam passing through the aperture, and wherein each of the first electrodes is connected to a control unit; wherein the base body has a first depth TG in a z-direction along which the first apertures extend through the base body; wherein the first electrodes each have a depth TE in the z-direction that is less than the depth TG, i.e., TE < TG;wherein the first electrodes are each embedded in the base body such that they are exposed in an area adjacent to and forming the aperture, and are otherwise embedded directly in the base body and thus without an electrical insulating layer; and wherein the material of the base body is glass or consists of glass.

The present application relates to the image processing method of optical remote sensing imaging detection, specifically relates to a multi-modal image fusion method and imaging system, in order to solve the existing technical image capture of target scene depends on time-sharing type imaging system or multi-device acquisition, resulting in different modal image registration difficulty, low registration accuracy, image edge details are inconsistent, the deficiency of poor fusion effect, the multi-modal image fusion method of the present application includes the original image and characteristic spectrum of target scene, multi-modal image preprocessing and multi-modal image fusion steps, based on the spectral radiation curve of target scene, spectral image and polarization image realizes multi-modal image fusion.Simultaneously, provide a kind of multi-modal image imaging system, including sub-aperture array compound eye unit, for obtaining the original image of target scene, realize the spectral image and polarization image of target scene are acquired simultaneously.

A lens element of a charged particle system comprises an electrode having a central opening. The lens element is configured for functionally cooperating with an aperture array that is located directly adjacent said electrode, wherein the aperture array is configured for blocking 5 part of a charged particle beam passing through the central opening of said electrode. The electrode is configured to operate at a first electric potential and the aperture array is configured to operate at a second electric potential different from the first electric potential. The electrode and the aperture array together form an aberration correcting lens.

Systems and methods are described, and one system includes a three-dimensional (3D) geometric tracker connected to a multiband (MB) inverse synthetic aperture array radar (ISAR), and a classification / alarm logic. The MB ISAR includes spatially distributed radar transmitters (TXs) and receivers (RXs), a TX / RX allocation logic, and a tomographic (TM) image logic. The TX / RX allocation logic is configured to receive 3D tracking data from the 3D geometric tracker, indicating subject 3D position and 3D orientation and, in response, dynamically allocate TXs and RXs to maintain MB illumination of and maintain MB reception of multiple scatter angles from subjects. The TM image processor is configured to construct TM images from the scatter angles, using 3D tracking data, for input to the classification and alarm logic. Optionally, the TX / RX resource allocation logic is configured to receive situation feedback data, for feedback adjusting of allocation of TXs and RXs.

The invention relates to the field of infrared thermal imaging, in particular to a miniaturized medium-wave infrared curved surface bionic compound eye optical system which comprises a curved surface multi-aperture array, an optical relay image rotation unit and an infrared detection unit. The curved surface multi-aperture array is of a compound eye structure formed by a plurality of sub-eyes with the same parameters. And the number of the lenses contained in each sub-eye is not more than 3. The optical relay image rotation unit converts a focal curved surface image of the curved surface multi-aperture array into a focal plane image, and the focal plane image is collected to the infrared detection unit. The number of lenses contained in the optical relay image rotation unit is not more than 6, and the optical relay image rotation unit has an object curved surface with the same curvature radius as the curved surface multi-aperture array and is matched with a diaphragm of the infrared detection unit. The system has the advantages of multiple compound eye apertures, light weight, miniaturization, large relative aperture, large target surface size, large field of view, high spatial resolution, cold diaphragm matching and the like, can perform operations such as quick capture, positioning and distance measurement on a moving target, and is particularly suitable for application scenes such as high-altitude over-the-ground wide-area detection, quick moving target positioning and tracking and the like.

A gun lens receives an electron beam or other particle beam, which is then divided into beamlets by an aperture array. Each of the beamlets is telecentric. A global imaging lens receives the beamlets from the aperture array. A micro deflector array on a plane of the global imaging lens includes deflectors configured to be individually controlled.