507 results about "Dual polarized" patented technology

The invention provides a multi-source data fused SAR sea surface significant wave height deep learning inversion method, and belongs to the technical field of remote sensing ocean, and the method specifically comprises the steps: preprocessing buoy data, and obtaining sea wave significant wave height data observed by a buoy; acquiring dual-polarization single-view complex SAR data collected in an interference wide-width mode; preprocessing the SAR data, and taking significant wave height data obtained by buoy observation as a label of the SAR data; acquiring auxiliary data corresponding to the SAR data, wherein the auxiliary data comprises wind speed, wind direction data, rainfall data and OCN data; and constructing a multi-source data-fused SAR significant wave high-depth learning inversion model, training the multi-source data-fused SAR significant wave high-depth learning inversion model, and testing and verifying the trained model by using the test set and the verification set to obtain a final significant wave height inversion result. According to the method, the SAR data inversion capability of the model is improved.

The invention relates to the technical field of remote sensing monitoring, and discloses a lake cyanobacterial bloom detection method and system fused with a remote sensing image. The method comprises the following steps: acquiring a multispectral remote sensing image and a synthetic aperture radar image of a target lake; calculating a phycocyanobilin characteristic index and a chlorophyll fluorescence peak index according to the characteristic wave band reflectivity, and screening pixels meeting discrimination conditions to obtain an optical water bloom distribution mask; calculating a radar inversion phycocyanobilin index through a nonlinear regression model according to the dual-polarization backscattering coefficient to obtain a radar water bloom distribution mask; and fusing the double masks to obtain a cyanobacterial bloom monitoring result. The method solves the problems that an existing cyanobacterial bloom detection method cannot realize all-weather monitoring, lacks cyanobacterial specific recognition capability and is insufficient in reliability of a single data source, and improves the timeliness, accuracy and reliability of cyanobacterial bloom detection.

The invention provides an ocean vortex region one-dimensional wave spectrum inversion method based on a synthetic aperture radar, and the method comprises the steps: recognizing an ocean vortex through HY-2 fusion data, collecting a Sentinel-1 dual-polarized SAR image covering a vortex region, and obtaining WAVEWATCH-III wave mode data; a hydrodynamic modulation transfer function is improved, and a vortex shear flow influence factor is introduced; an XGBoost machine learning model is adopted, and an ocean vortex region SAR one-dimensional sea wave spectrum inversion algorithm is established; and verifying the accuracy of the SAR one-dimensional sea wave spectrum inversion algorithm. According to the method, the precision limitation of traditional wave theory inversion in a vortex region is broken through, and the one-dimensional wave spectrum inversion precision is improved.

The invention relates to the technical field of array antennas, and discloses a common-caliber layout-based ultra-wideband array antenna, which comprises a low-frequency unit and a high-frequency unit which are arranged based on a common caliber, and is characterized in that the working frequency of the low-frequency unit covers an fmin-f0 frequency band, and the working frequency of the high-frequency unit covers an f0-fmax frequency band. The low-frequency unit is a broadband dual-polarized antenna, a uniform tight coupling array distributed at equal intervals is formed by adopting a tight coupling principle, and the unit interval is calculated based on a grating lobe suppression condition at the frequency f0. The high-frequency unit is a miniaturized broadband dual-polarized antenna and adopts a sparse array form; the initial unit spacing and the unit number of the sparse array are calculated based on the grating lobe suppression condition at the highest frequency f2 of the f1-f2 frequency band with the side lobe requirement between the f0-fmax frequency bands. The ultra-wideband array antenna gives consideration to full-band array performance, can provide sufficient space for active circuit arrangement, and effectively reduces power consumption and cost.

The invention discloses a reflective array antenna control method and system based on a broadband dual-polarization unit, and the method comprises the steps: obtaining a target wave beam pointing instruction, and carrying out the orthogonal decomposition of the target wave beam pointing instruction into a first polarization control vector and a second polarization control vector; calculating a theoretical phase frequency spectrum of each unit according to the polarization control vector; calling a preset database to extract a basic phase spectrum; quantitative mapping is carried out by calculating a matching error between a theory and a basic phase frequency spectrum, a phase control code containing the first polarization and the second polarization is obtained and loaded to a corresponding broadband dual-polarization unit to drive the switching of a physical state of the broadband dual-polarization unit, and real-time reconstruction of a wave beam is realized. Compared with the prior art, the antenna can overcome the defects that a traditional reflective array antenna is serious in polarization component coupling, low in phase matching degree in a broadband range and inaccurate in phase control code acquisition, and remarkably enhances the independent pointing precision and the full-band gain stability of dual-polarization beams. Therefore, flexible reconstruction of the wave beam in polarization and frequency dimensions is realized.

The invention relates to the field of array signal processing, and particularly discloses a DOA joint estimation method based on a quaternion polarization sensitive array. Electromagnetic wave dual polarization components are captured through the orthogonal dipole and the loop antenna, and a quaternion observation matrix is constructed; calculating a quaternion covariance matrix by adopting a sliding window mechanism, and separating a signal / noise subspace by adopting quaternion singular value decomposition; and constructing a spatial spectrum function in combination with a quaternion steering vector, and realizing joint estimation of an azimuth angle and a pitch angle through two-dimensional search. According to the method, the unified characterization capability of quaternions on polarization-airspace information is fully utilized, and the DOA estimation precision and the anti-interference performance of the multi-polarization signal are remarkably improved.

The invention relates to the technical field of electromagnetic fields and microwaves, and discloses a broadband high-integration-level dual-circularly polarized antenna which comprises an ultra-wideband self-compensation structure plane radiation surface, an ultra-wideband special-shaped reflection cavity, an ultra-wideband impedance transformer and an ultra-wideband integrated dual-polarized feed network. Wherein the ultra-wide-band self-compensation structure plane radiation surface is arranged at the forward position of the ultra-wide-band special-shaped reflection cavity, and radiation of ultra-wide-band dual circularly polarized waves is executed; the ultra-wide-band special-shaped reflection cavity executes matching and forward reflection of ultra-wide-band backward electromagnetic waves; the ultra-wideband impedance transformer executes radio frequency connection and impedance conversion between the ultra-wideband self-compensation structure plane radiation surface and the ultra-wideband integrated dual-polarization feed network; the ultra-wideband integrated dual-polarization feed network performs conversion from an unbalanced signal to a balanced signal and formation of a dual-circularly polarized signal. Unification of directional diagrams, polarization, axial ratio and standing wave bandwidth of more than 15: 1 frequency multiplication can be realized, and the ultra-wideband dual-circular polarization antenna has the advantages of ultra-wideband, miniaturization, constant wave beam and dual-circular polarization.

The invention discloses a dual-polarization one-dimensional scanning phased-array antenna and a weather radar system, the antenna comprises a radiation layer, a first feed layer, a first PCB layer, a second feed layer, a second PCB layer and a third feed layer which are stacked from top to bottom, and a horizontal polarization radiation unit and a vertical polarization radiation unit of the radiation layer are arranged in an orthogonally staggered manner; each first feeder is etched on the top surface of the first PCB layer and corresponds to a first metal groove formed in the bottom of the first feed layer and a second metal groove formed in the top of the second feed layer in position; and each second feed line etched on the top surface of the second PCB layer corresponds to the position of a third metal groove formed in the bottom of the second feed layer and the position of a fourth metal groove formed in the top of the third feed layer. According to the invention, high cross polarization isolation is realized, and the antenna has dual polarization beams with low side lobes and consistent beam width and pointing height in the whole working frequency band.

The invention belongs to the technical field of meteorology, particularly relates to a rapid rainfall detection system based on a rain detection radar, and aims to solve the problems of large error, many monitoring blind areas and poor stability in the prior art. The rapid rainfall detection system based on the rain detection radar further comprises a dual-polarization detection module, a high-precision servo driving module, an all-solid-state transceiving module, a multi-dimensional signal processing module, an intelligent display control module, a low-power-consumption power supply module, a wide-area communication networking module and an automatic calibration module. The dual-polarization detection module, the high-precision servo driving module, the all-solid-state transceiving module, the multi-dimensional signal processing module, the intelligent display control module, the wide-area communication networking module and the automatic calibration module are electrically connected with the low-power-consumption power supply module, the detection precision is greatly improved, no blind area exists in coverage, the efficiency is high, the stability is high, the power consumption is low, and the system is suitable for popularization and application. And the deployment is flexible, the environmental adaptability is good, and the networking collaboration and automation level is high.

A system and method for determining an error vector magnitude (EVM) of a polarized transmission from a device-under-test (DUT). A first signal transmitted by the DUT is received via a horizontally polarized receiver antenna, and a second signal transmitted by the DUT is received via a vertically polarized receiver antenna. The second signal is coherent with the first signal. The EVM is calculated based at least in part on the first signal and the second signal and a reference signal.

The embodiment of the invention discloses a maritime search and rescue target detection method, device and equipment based on a harmonic radar. A specific implementation mode of the method comprises the following steps: generating a plurality of paths of emission excitation signals through a signal processing board and a first wave band receiving and transmitting module; performing electron beam scanning on the target sea surface area according to the antenna module, the first wave band receiving and transmitting module and the multiple paths of transmitting excitation signals; performing waveband front-end processing on the second waveband echo signal to generate four paths of polarized monopulse channel signals; performing frequency domain polarization feature extraction on the four paths of polarization monopulse channel signals to generate a signal frequency domain polarization feature set; and performing adaptive target detection on the signal frequency domain polarization feature set to generate a search and rescue target detection result. According to the embodiment, an S / C harmonic radar and a dual-polarization phased array structure are adopted, and the search and rescue target generates a receivable harmonic echo, so that sea clutter energy is suppressed in two physical dimensions of frequency band and polarization, and stable detection of the search and rescue target is further realized.

A quad-polarized antenna system according to the present invention comprises a plurality of RF chains, and an antenna array in which rows of first dual-polarized antenna units and rows of second dual-polarized antenna units are alternately arranged in a horizontal direction. The first dual-polarized antenna unit and the second dual-polarized antenna unit have different dual polarization characteristics from each other. The rows of first dual-polarized antenna units are used to form at least one first beam and at least one second beam which have + / −45° polarizations, and the rows of second dual-polarized antenna units are used to form at least one third beam and at least one fourth beam which have 0° / 90° polarizations. The first beam, the second beam, the third beam, and the fourth beam are formed towards different spatial directions, and the first and third beams correspond to main lobes, and the second and fourth beams correspond to grating lobes.

A patch antenna element has a plurality of patches that are coplanar, each having a length along a resonant dimension that is no greater than one-quarter of a wavelength of a maximum operating frequency of the patch antenna element. The antenna element also includes one or more discrete reactive elements. For each pair of neighboring patches of the plurality of patches, the pair forms an electrically insulating space therebetween. At least one discrete reactive element lies within the electrically insulating space and is electrically connected to both of the neighboring patches of the pair. A patch antenna combines the patch antenna element with a counterpoise that is parallel to, and displaced from, the patch antenna element. Each discrete reactive element may be an inductor or capacitor, either planar or non-planar. The patch antenna may be configured as a dual-polarization patch antenna or quarter-wave patch antenna.

A waveguide feed array includes overlapping clusters of elementary feeds, each feed configured to operate in at least two distinct frequency bands with dual-polarization in each frequency band. The feeds have at least four waveguide ports each, one for each pairing of frequency band and polarization, and are connected through beamforming networks, one per frequency band. Clusters of feeds each have at least two beamforming networks and at least two common ports. The waveguide feed array further has a main longitudinal direction that is substantially orthogonal to a plane of an aperture of the waveguide feed array, the plane being defined by two main directions. Adjacent clusters along a first of the main directions are configured to operate, for a given frequency band, in different polarizations. At least one feed of each cluster is rotated around the main longitudinal direction with reference to the other feeds of said cluster.

A wireless communication device includes a MIMO antenna array with dual-polarized antennas to receive RF signals in vertical and horizontal polarizations across a plurality of frequency bands. The received RF signals are filtered to isolate signals-of-interest, down-converted and digitized to obtain digitized down-converted signals. The wireless communication device includes a processor to concurrently process the digitized down-converted signals based on configuration of multi-link operation (MLO) parameters in the wireless communication device. The processor performs cross-band correlation between the processed digitized down-converted signals of the first intermediate frequency band and second intermediate frequency band to identify related signal patterns. The processor classifies detected signals based on the cross-band correlation, null steering, and an angle-of-arrival information and controls the wireless communication device to trigger an operational response based on the classified signals and the cross-band correlation.

The invention discloses a millimeter wave dual-polarization phased-array antenna beam forming method and device, and relates to the technical field of high-frequency communication, and the method comprises the following steps: obtaining a complex weight signal of each array element in an antenna array under a horizontal polarization channel and a vertical polarization channel, respectively carrying out amplitude response and phase response acquisition and calibration processing on the complex weight signal; performing dynamic extraction and modeling on amplitude errors and phase errors of each array element in different polarization channels; on the basis of error estimation, constructing a machine learning prediction module comprising a time sequence prediction model; performing joint estimation on a real-time error estimation result and a prediction error result; constructing a hardware-software collaborative calibration structure comprising a dynamic gain control module on the basis of the compensation weight; beam focusing of the target space area is realized; according to the invention, the hidden problems of beam offset, sidelobe lifting, gain loss and the like caused by inconsistency of polarization channels are solved.

The invention discloses a main lobe suppression type polarization agility interference suppression method, which aims at main lobe suppression type interference with polarization parameters dynamically changing, and constructs a transient polarization projection vector IPPV of an orthogonal polarization receiving signal based on the orthogonal polarization receiving signal of a dual-polarization radar. And detecting polarization parameter abrupt change points of the orthogonal polarization receiving signals by adopting a heuristic segmentation algorithm, and segmenting the orthogonal polarization receiving signals by using the polarization parameter abrupt change points to obtain polarization segmented receiving signals. And aiming at polarization segmented receiving signals with different polarization parameters, obtaining interference cancellation parameters and carrying out interference suppression by utilizing a self-adaptive polarization cancellation algorithm based on a minimum variance criterion to obtain interference suppression signals. According to the interference cancellation parameters of different polarization segment receiving signals, amplitude and phase compensation is carried out on the interference suppression signals, reference signals for pulse compression are reconstructed, and after pulse compression processing is carried out, main lobe suppression type polarization agility interference cancellation and target detection are achieved.

The invention discloses an NRCS determination method for a Ku wave band scatterometer under a rainfall condition, and relates to the field of satellite ocean remote sensing and meteorological detection.The method comprises the steps that the action mechanism of rainfall on radar signals in the atmosphere is considered, and a sea surface radar back scattering theoretical model is constructed based on a wind-generated sea surface wave spectrum and a dual-scale Bragg scattering theory; obtaining a rainfall attenuation coefficient, a normalized radar backscattering cross section contributed by raindrop scattering and dual-polarization normalized radar backscattering cross sections of a C wave band and a Ku wave band based on a sea surface radar backscattering theoretical model; according to the rainfall attenuation coefficient, the normalized radar backscattering cross section contributed by raindrop scattering and the dual-polarization normalized radar backscattering cross sections of the C wave band and the Ku wave band, the normalized radar backscattering cross section of the Ku wave band scatterometer under the rainfall condition is obtained; according to the method, the accurate normalized radar back scattering cross section of the Ku wave band scatterometer is obtained under the rainfall condition.

Dual-polarized antenna, including several antenna elements arranged in cell units. Each cell unit includes four antenna elements and two 1-to-4 junctions, a first of the two junctions being associated with a first polarization and a second of the two junctions being associated with a second polarization. The antenna also includes an array of dividers / combiners. The four antenna elements of each cell unit are superposed and several cell units are juxtaposed. Each cell unit includes two antenna elements and two other antenna elements which are offset.

The invention provides a multi-modal fusion radar tide level intelligent adaptive filtering method, which belongs to the technical field of radar tide, and comprises the following steps: through dual-polarization radar signal acquisition, performing three-layer wavelet decomposition on vertical and horizontal polarization digital intermediate frequency signals, and marking clutter coefficients based on variance and skewness threshold values; performing adaptive soft threshold processing, evaluating residual clutter confidence coefficient by using a convolutional neural network, dynamically adjusting suppression intensity, calculating a polarization phase difference sequence, inputting the polarization phase difference sequence into a long-short-term memory network to identify a false target distance unit, and calculating multipath path parameters by combining ray tracing of a digital elevation model to perform phase compensation and amplitude correction; finally, an accurate tide level height value is obtained by detecting a real tide level distance Doppler spectrum peak value, and the technical problem that the measurement precision is reduced due to the fact that radar tide level measurement cannot effectively distinguish clutter interference and multipath false targets in a complex marine environment is solved.

The invention discloses an orthogonal dual-polarization metal slot antenna substructure and a manufacturing method thereof, and an array antenna, and the substructure comprises a first horizontal antenna unit half-radiation sheet, a second horizontal antenna unit half-radiation sheet, a first vertical antenna unit half-radiation sheet, and a second vertical antenna unit half-radiation sheet. The first horizontal antenna unit half-radiation sheet, the second horizontal antenna unit half-radiation sheet, the first vertical antenna unit half-radiation sheet and the second vertical antenna unit half-radiation sheet are of a cross-shaped integrally-formed structure. The outer edges of the first horizontal antenna unit half-radiation sheet, the second horizontal antenna unit half-radiation sheet, the first vertical antenna unit half-radiation sheet and the second vertical antenna unit half-radiation sheet are of arc-shaped structures; the non-electromagnetic sensitive area of each half radiation sheet in the orthogonal dual-polarization metal slot antenna substructure is provided with a plurality of weight reduction cavities. Therefore, the problems of structural design and manufacturing of some high-frequency-band, small-size and high-performance orthogonal dual-polarization metal slot array antennas are solved.

This application provides a dual-polarized differential base station antenna, relating to the field of communication technology. The dual-polarized differential base station antenna includes a dielectric substrate, a first resonant cavity, multiple second resonant cavity groups, a coupling component, and a coaxial feed conductor. The first resonant cavity is disposed inside the dielectric substrate and extends to the upper and lower surfaces of the substrate. A first radiation slot is provided on the upper surface of the first resonant cavity. Multiple second resonant cavity groups are symmetrically distributed around the first resonant cavity. Each second resonant cavity group includes at least one second resonant cavity, and a second radiation slot is provided on the upper surface of each second resonant cavity. The coupling component connects the first resonant cavity to each second resonant cavity group. The coaxial feed conductor is connected to a ground plane and penetrates the dielectric substrate to connect to the upper surface of the first resonant cavity. The dual-polarized differential base station antenna of this application achieves high gain, high isolation, and wide bandwidth performance while maintaining a low profile structure.

The invention relates to a dual-polarization 2bit transmission type metasurface unit working in a Ka wave band, which can realize four-state phase regulation and control of horizontal polarization and vertical polarization on a specified frequency band. And an implementation scheme with a better system integration advantage is provided for the high-frequency multi-polarization reconfigurable antenna system. The unit is composed of two groups of linearly polarized 2bit reconfigurable units which are orthogonally arranged, and each unit is composed of a pair of active receiving antennas at the bottom and a pair of active transmitting antennas at the top; a pair of PIN diodes are respectively integrated in a receiving antenna and a transmitting antenna, and four discrete phase states are realized through combination of switch states, so that 2-bit phase regulation and control are completed. The invention has the following advantages: 1, low transmission amplitude loss and precise phase gradient characteristic are shown in the dual-polarization Ka wave band, and high-precision wave beam regulation and control can be realized; 2, due to the fact that dual-line polarization adopts a synchronous regulation and control mode, the unit can complete phase control only through two feeder lines, and compared with an independent polarization control scheme, the complexity of a feed and bias network is remarkably reduced, so that interference of a bias circuit on electromagnetic radiation characteristics is effectively reduced; and 3, the emergent wave beam of the transmission type metasurface is located on the same side with the transmission type metasurface, so that the shielding of the feed source can be reduced, the interference of a reflection path is avoided, the aperture efficiency is improved, and the sidelobe is reduced.

An optical system includes a first modulator configured to: receive first input light, modulate an amplitude of the first input light with a first data signal, modulate a phase of the first input light with a first marker signal, and output to an optical element, as first modulated light, the first input light modulated with the first data signal and the first marker signal. The optical system includes a second modulator configured to: receive second input light, modulate an amplitude of the second input light with a second data signal, modulate a phase of the second input light with a second marker signal, and output to the optical element, as second modulated light, the second input light modulated with the second data signal and the second marker signal. The second marker signal includes a complementary version of the first marker signal.

The application provides a high-isolation dual-polarized phased array TR assembly based on front and back layouts, and relates to the technical fields of microwave and phased array radar. The assembly comprises a multilayer printed board structure cavity, a first surface of the multilayer printed board structure cavity is provided with a radio frequency link of a first polarization channel, and a second surface is mirror-imaged with a radio frequency link of a second polarization channel; the first surface is opposite to the second surface; the first polarization channel and the second polarization channel are orthogonal polarization channels. The application fundamentally solves the polarization crosstalk problem caused by the traditional side-by-side layout, can improve the dual-polarization isolation to more than 80 dB, optimizes the space utilization and the heat dissipation path, and is particularly suitable for high-density and high-performance dual-polarized phased array antenna systems.

The invention discloses a high-precision InSAR (Interferometric Synthetic Aperture Radar) deformation monitoring method combining polarization information and deep learning, and particularly relates to the crossing field of radar remote sensing and deep learning technologies. The method comprises the following steps: acquiring multi-temporal complete polarization or dual polarization SAR original data, generating single-view complex data through radiometric calibration, registration and multi-view processing, and extracting a polarization coherence matrix; constructing a sample set containing polarization features and interferometric phase labels; designing a double-branch deep learning network model composed of a polarization feature extraction branch and a phase optimization branch, and processing a polarization matrix and a phase sequence by adopting a three-dimensional convolution structure and a long and short term memory-convolution hybrid structure; the deep polarization features and the optimized phase information are fused through the trained model, and the deformation quantity is output through regression calculation; and finally, generating a deformation graph under a geodetic coordinate system through geocoding. The polarization scattering characteristic is effectively utilized, and the monitoring precision and reliability in a complex scene are improved.

The invention is suitable for the technical field of electromagnetic wave regulation and control, and provides a dual-polarization angle selection surface for suppressing antenna side lobes, which comprises a plurality of periodically arranged dual-polarization angle selection surface units, the dual-polarization angle selection surface unit comprises a first metal layer, a first dielectric substrate, PMI foam, a second dielectric substrate and a second metal layer which are sequentially stacked from top to bottom; the centers of the first metal layer, the first dielectric substrate, the PMI foam, the second dielectric substrate and the second metal layer coincide; the first metal layer and the second metal layer are of the same structure and each comprise a hexagonal gap and a gap shaped like a Chinese character'mi '. According to the invention, the in-band radiation performance can be ensured, and the antenna sidelobe can be significantly reduced.

The embodiment of the invention provides a dual-polarization indoor distribution antenna, and belongs to the antenna communication equipment technology, the dual-polarization indoor distribution antenna comprises a vertical polarization radiation unit and a horizontal polarization radiation unit, the vertical polarization radiation unit comprises a grounding plate and a conical radiation oscillator arranged on the grounding plate, the conical radiation oscillator is used for being excited to radiate vertical polarization electromagnetic waves; the horizontally polarized radiation unit comprises a plurality of radiation subunits, the plurality of radiation subunits are sequentially arranged around the peripheral side of the conical radiation oscillator, a radiation gap is formed between every two adjacent radiation subunits, and the radiation gaps are used for being excited to radiate horizontally polarized electromagnetic waves; the orthographic projection of the radiation subunit on the grounding plate is located in the grounding plate. According to the dual-polarization indoor distribution antenna provided by the embodiment of the invention, broadband coverage can be realized, and the multi-band requirement of an indoor communication system is met.

The invention discloses a dual-polarized antenna with an adjustable radiation zero point applied to a satellite communication phased array system. The dual-polarized antenna comprises a radio frequency connector, a radiation metal patch, a metal floor and a dielectric substrate located between the radiation metal patch and the metal floor. The radiation metal patch comprises four groups of metal sheets, and any two adjacent groups of metal sheets are arranged at intervals; the number of the radio frequency connectors is four, and each radio frequency connector is connected with a group of metal sheets; the dual-polarized antenna with the adjustable radiation zero point further comprises two groups of radiation zero point scanning control networks, one group of radiation zero point scanning control networks is connected with two groups of opposite metal sheets through radio frequency connectors, and the other group of radiation zero point scanning control networks is connected with the other two groups of opposite metal sheets through radio frequency connectors. The dual-polarized antenna with the adjustable radiation zero point is simple in structure, and scanning control and dual polarization of the radiation zero point can be achieved.