795 results about "Dual polarized" patented technology

The invention provides a passive radar seeker anti-interference identification method based on a dual-polarization array, and the method comprises the steps: obtaining a first signal and a second signal, and carrying out the time-space alignment calibration of the first signal and the second signal, and obtaining a first polarization signal and a second polarization signal; performing polarization-Doppler-frequency band three-dimensional tensor construction on the first polarization signal and the second polarization signal; performing dynamic core tensor decomposition processing on the polarization-Doppler-frequency band three-dimensional tensor to obtain a target polarization characteristic parameter and an interference polarization characteristic parameter; performing interference suppression processing on the first polarization signal and the second polarization signal through polarization matched filtering to generate an anti-interference enhanced signal; performing polarization scattering mechanism decomposition processing on the target polarization characteristic parameter to generate a target surface scattering component and a dihedral angle scattering component; and outputting an anti-interference identification result based on the target surface scattering component, the dihedral angle scattering component and the polarization phase consistency parameter of the anti-interference enhancement signal. The method can improve the anti-interference recognition precision of the radar.

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 discloses a soil water content inversion method based on improved combination roughness, and relates to the field of remote sensing, and the method comprises the steps: synchronously obtaining a Sentinel-1 radar image and a Sentinel-2 optical image, and extracting different polarization backscattering coefficients, local incident angles and normalized water body indexes through preprocessing; the method comprises the following steps: generating a bare soil simulation backscattering coefficient data set, removing vegetation scattering contribution by using a water cloud model, obtaining a real bare soil backscattering coefficient, constructing a training set and a verification set containing actually measured soil water content, constructing a lookup table based on double models, and calculating the water content of the bare soil by minimizing a root-mean-square error between simulation and the real backscattering coefficient. Global search is carried out in a preset parameter space to determine an optimal earth surface root mean square height and a correlation length, a novel polynomial combination roughness is constructed, a physical correlation between the roughness and a backscattering coefficient is established, a dual-polarization empirical equation set is constructed, and simultaneous solution is carried out after parameters are optimized according to a criterion; according to the method, a more reasonable inversion result of the soil water content in a large range can be obtained.

The embodiment of the invention provides a ka and k waveband dual-frequency dual-polarization broadband wide-angle scanning common-aperture antenna unit and an antenna array, and relates to the technical field of common-aperture antenna arrays, the antenna unit comprises an antenna unit substrate, a low-frequency antenna, a high-frequency antenna and a wide-angle matching layer; the low-frequency antenna and the high-frequency antenna are arranged in the antenna unit substrate, and the high-frequency antenna comprises a shielding enclosure frame which is located between the low-frequency antenna and the high-frequency horizontal polarization L-shaped feed probe and between the low-frequency antenna and the high-frequency vertical polarization L-shaped feed probe; the wide-angle matching layer is arranged on the front surface of the antenna unit substrate and is positioned above the low-frequency antenna and the high-frequency antenna; wherein the low-frequency antenna is an L-shaped probe coupling microstrip patch antenna with a shielding enclosure frame, and the high-frequency antenna is a slot antenna. The antenna is simple in structure, employs a printed board technology, is very low in processing difficulty, is lower in cost, and is easy to be interconnected with rear-end equipment.

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 dual-polarized antenna comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, a fifth dielectric substrate and a double-feed probe, the first dielectric substrate, the second dielectric substrate and the fifth dielectric substrate are stacked, one surface of the first dielectric substrate is provided with four centrosymmetric patch units, and the surface, close to the first dielectric substrate, of the second dielectric substrate is provided with a radiation patch coaxial with the patch units. A first I-shaped gap and a second I-shaped gap which are crossed, vertical and centrosymmetric are formed in the third dielectric substrate close to the second substrate surface, a plurality of first metalized via holes are formed in the periphery, and the gaps are coaxial with the patch unit; the fourth dielectric substrate is provided with a first T-shaped microstrip feeder line and a second T-shaped microstrip feeder line which are not in contact with each other, the periphery of the fourth dielectric substrate is provided with second metalized via holes which are in one-to-one correspondence with the first via holes, and the feeder lines are respectively corresponding to the I-shaped gaps; and the double-feed probe is respectively connected with the feed points of the first T-shaped microstrip feeder and the second T-shaped microstrip feeder through feed holes. By adopting the dual-polarized antenna, the port isolation and the wide-angle scanning range can be improved.

The invention provides an unmanned aerial vehicle dual-polarized antenna multipath interference suppression and polarization mismatch joint optimization algorithm, and relates to the technical field of low-altitude communication, and the algorithm carries out the coupling modeling of a multipath interference problem and a polarization mismatch problem through building a unified dual-polarized channel model which considers multipath propagation and time-varying polarization characteristics; an adaptive polarization state estimation method based on received signal covariance matrix feature analysis is provided; a combined space-time-polarization domain adaptive filter structure is designed; a joint optimization objective function containing a minimum mean square error and a maximum polarization matching degree (MPM) is constructed; a low-complexity adaptive weight updating rule based on a recursive least square (RLS) thought and integrated with polarization constraints is deduced. According to the algorithm, interference suppression and polarization matching are collaboratively optimized through a unified framework, the complexity is reduced by adopting recursive calculation, rapid convergence and strong environmental adaptability are realized, and the low-altitude communication performance of the unmanned aerial vehicle is remarkably improved.

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 dual-polarization radars, and discloses a dual-polarization radar transmitting dual-channel consistency checking method and system, and the method comprises the steps: constructing a dual-polarization radar transmitting dual-channel structure equation model and radar operation state data; determining a dual-polarization radar transmitting dual-channel consistency analysis path diagram; using a daily quantile pairing method and radar operation state data to check the significant difference of the same attribute observation variables of the two channels of the antenna; under the condition that significant difference exists, calculating a dual-channel optimal path coefficient of the same attribute observation variable by adopting a daily quantile-to-daily quantile regression method and radar operation state data; and configuring the optimal path coefficient of the two channels based on the analysis path diagram, and comparing and analyzing the consistency of the two channels on different daily quantiles. According to the method, the dynamic consistency characteristic of dual-channel influence during radar operation can be tested.

Various embodiments relate to a radar system, including: a transmitter; a transmit antenna connected to the transmitter, wherein the transmit antenna is a circular polarized antenna; a receiver; a receive antenna connected to the receiver, wherein the receive antenna is a dual polarization antenna having a main lobe and ambiguity sidelobes; wherein the radar system is configured to: transmit a first and second radar signal with first and second circular polarizations in first and second modes; receive reflected first and second radar signals; process the received first and second radar signals to detect a target and to produce first and second mode target powers; comparing the first mode target power to the second mode target power to determine which lobe of the antenna in which the target is located.

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 discloses a device and a method for realizing a near-field dual-polarization perfect Janus dipole, and relates to the technical field of near-field coupling and excitation of dipoles. The implementation device comprises a dual-polarization perfect Janus dipole and two dielectric waveguides which are arranged in parallel. The implementation method comprises the steps of designing parameters of the dielectric waveguides and the dipoles, constructing a rectangular coordinate system, placing the two parallel dielectric waveguides on an xy plane, and placing the dipoles in the middle positions of the parallel dielectric waveguides. P-polarized and s-polarized waves excited by the dipole are coupled to the dielectric waveguide to excite guided waves, an electromagnetic field on the surface of the dielectric waveguide is detected through a detection device, and the near-field coupling characteristic of the dual-polarized perfect dipole is analyzed based on extracted field distribution data. The invention provides a new way for the development of polarization multiplexing photonic devices, quantum routing and on-chip signal processing technologies.

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 discloses a battery parameter identification method and system, belongs to the technical field of battery management, and solves the problems of high model dependency, weak anti-noise capability, difficulty in balancing real-time performance and precision, lack of aging adaptability and limited generalization capability of an existing method. The method comprises the steps of exciting a battery based on a mixed pulse power characteristic test or a dynamic working condition test, collecting dynamic test data of the battery, pre-constructing a dual-polarization model, identifying and analyzing the dynamic test data by the dual-polarization model, and outputting a parameter identification result. In the invention, the dual-polarization model comprises the ohmic internal resistance and the two RC parallel networks for representing electrochemical polarization and concentration polarization respectively, and the voltage change of the battery in the charging and discharging process can be reflected more accurately, so that the electrochemical process of the battery is described more accurately; the precision, robustness and full-life-cycle applicability of battery parameter identification are remarkably improved, and key technical support is provided for a high-safety and high-reliability battery management system.

For example, an apparatus may include a baseband controller configured to control a plurality of dual-polarization Radio Heads (RHs) to communicate a Multiple-Input-Multiple-Output (MIMO) transmission, the baseband controller configured to control a first dual-polarization RH of the plurality of dual-polarization RHs to communicate a first spatial stream of the MIMO transmission with a horizontal-polarization via one or more first dual-polarization antenna elements of the first dual-polarization RH, and to control a second dual-polarization RH of the plurality of dual-polarization RHs to communicate a second spatial stream of the MIMO transmission with a vertical-polarization via one or more second dual-polarization antenna elements of the second dual-polarization RH.

The invention discloses a power transmission tower environment inversion monitoring method and device, terminal equipment and a storage medium, and relates to the technical field of power systems, and the method comprises the steps: obtaining multi-source data of a target region of a power transmission tower; building mask information of the target area is extracted based on the optical remote sensing image and the dual-polarization remote sensing image, and the building mask information in the dual-polarization remote sensing image and the optical remote sensing image is removed to obtain a to-be-input remote sensing image; inputting a remote sensing image to be input and meteorological data into a pre-constructed convolution model as input data; and performing inversion monitoring according to the input data through the convolution model, and outputting a plurality of meteorological parameter predicted values. According to the method, two different types of remote sensing data are combined to extract the building mask information of the power transmission tower in a complex environment, so that the precision error caused by taking the building mask information as a misjudgment area can be effectively avoided, and the environment inversion monitoring effect can be effectively improved.

The invention discloses a dual-frequency dual-polarization duplex phased array for multi-standard communication, aims to solve the technical bottleneck of the existing millimeter wave phased array in frequency band compatibility, polarization diversity and duplex operation, and comprises a millimeter wave broadband dual-polarization end-on-fire antenna and a dual-frequency dual-polarization duplex phased array architecture. According to the phased array established by the invention, four sets of independent beam forming systems are integrated on a single printed circuit board and correspond to a first frequency band vertical polarization channel, a first frequency band horizontal polarization channel, a second frequency band vertical polarization channel and a second frequency band horizontal polarization channel respectively, and concurrent transmission and independent beam control of dual-frequency-band and dual-polarization signals are supported. The phased array realizes two-dimensional expandability based on a brick-shaped framework, can be used for constructing a planar array, and is suitable for a large-scale deployment scene. The compact size and low-cost scheme provides a high-integration, high-flexibility and high-reliability communication solution for B5G / 6G multi-standard scenes such as intelligent transportation, industrial Internet of Things and smart home.

The invention belongs to the field of particle accelerator microwaves, and particularly relates to a C-band compact spherical microwave pulse compression device which comprises a shell, a dual-polarization mode coupler and a circular waveguide, a spherical energy storage cavity is formed in the shell, and the circular waveguide and the spherical energy storage cavity are communicated through a coupling hole; the dual-polarization mode coupler comprises a rectangular waveguide, a butterfly-shaped matching section and a cylindrical matching section. According to the klystron radio frequency pulse compression circuit, the radio frequency pulse with the pulse width of 2.5 microseconds of the klystron can be compressed to 300ns, the average power gain in a single pulse is more than 4 times, the peak power gain is 6.3 times, and the compression efficiency is about 54%. According to the dual-polarization mode coupler, the functions of power distribution, mode conversion and polarization mode generation are synchronously realized, a TE10 mode in a rectangular waveguide is converted into two polarization TE11 modes which are equal in amplitude and orthogonal in phase, and then the two orthogonal TE114 modes are excited in a spherical energy storage cavity.

Various example embodiments for supporting optical communications in an optical communication system may be configured to support dual-polarization alignment for dual-polarization communications within an optical communication network. Various example embodiments for supporting dual-polarization alignment, within an optical communication network supporting optical communications from a transmitter to a receiver based on dual polarizations including a first polarization and a second polarization, may be configured to support dual-polarization alignment to the dual polarizations at the receiver based on communication of a data segment such that a first portion of the data segment is communicated based on the first polarization and a second portion of the data segment is communicated based on the first polarization and the second polarization.

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 relates to the technical field of communication, and provides an antenna polarization mode switching circuit, a switching method, a storage medium and a program product, the antenna polarization mode switching circuit comprises a control unit, a radio frequency system and a polarization switching module; one end of a first double-pole double-throw switch in the polarization switching module is connected with a single-pole three-throw switch, and the other end of the first double-pole double-throw switch is connected to an electric bridge; the other end of the bridge is connected to the second double-pole-double-throw switch; the other end of the second double-pole-double-throw switch is respectively connected to two feeding points of the dual-polarized antenna; the radio frequency system is connected to the first double-pole double-throw switch or any one of the two feeding points of the dual-polarized antenna through the single-pole three-throw switch, and is used for receiving an antenna signal or transmitting a radio frequency signal; and the control unit is used for outputting a control signal to the switch in the polarization switching module so as to realize polarization mode switching of the dual-polarized antenna by switching the connection state of the switch. Through the antenna polarization mode switching circuit, the communication effect between the two wireless communication devices can be guaranteed.

The utility model provides a positive and negative 45-degree orthogonal dual-polarization cross anti-unmanned aerial vehicle antenna structure, which comprises a shell, a positive and negative 45-degree orthogonal dual-polarization cross anti-unmanned aerial vehicle antenna module and an antenna outer cover, the positive and negative 45-degree orthogonal dual-polarization cross anti-unmanned aerial vehicle antenna module and the antenna outer cover are positioned in the shell, and the positive and negative 45-degree orthogonal dual-polarization cross anti-unmanned aerial vehicle antenna module adopts six antenna module outputs. Comprising an antenna bearing aluminum plate; a mechanical mounting hole, a 868MHz / 915MHz radio frequency cable joint, a 1.5 GHz radio frequency cable joint, a + 2.4 GHz radio frequency cable joint, a-2.4 GHz radio frequency cable joint, a 5.8 GHz radio frequency cable joint, a 5333MHz-6GHz radio frequency cable joint, a 1.5 GHz coupler, a 2.4 GHz directional coupler, a 868MHz / 915MHz power divider, a 5.8 GHz aluminum plate antenna, a 5.8 GHz antenna oscillator, a 1.5 GHz T-shaped antenna, a 1.5 GHz antenna oscillator, a 868MHz / 915MHz symmetrical antenna, a 868MHz / 915MHz antenna oscillator, a 2.4 GHz ceramic antenna and a 2.4 GHz antenna oscillator are arranged on the base. The device is scientific in structure and easy to install.

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 provides a frequency selective surface unit and a frequency selective surface antenna housing, and relates to the technical field of communication. The frequency selection surface unit is composed of a first metal layer, a first dielectric layer, a second metal layer, a second dielectric layer, another second metal layer, a third dielectric layer and another first metal layer which are sequentially stacked from top to bottom. Wherein the two first metal layers form an improved square gap ring, and the two second metal layers form an improved Jerusalem cross gap. Moreover, the two first metal layers and the two second metal layers are respectively of a rotational symmetry structure, and the rotation centers of the two first metal layers coincide with the rotation centers of the two second metal layers. And the M * N periodically arranged frequency selective surface units form the frequency selective surface antenna housing. The frequency selective surface antenna housing provided by the invention has the advantages of high frequency selectivity, large-angle incidence stability and miniaturization while realizing a dual-frequency dual-polarization function.

The utility model provides an ultra-wide-band high-performance array antenna, which comprises a plurality of ultra-wide-band oscillator units arranged on a reflecting substrate in an array form, the ultra-wideband oscillator unit comprises a plurality of radiation parts arranged on the dielectric plate at intervals, and the radiation arm of any radiation part and the radiation arm of the adjacent radiation part are collinear to form a dipole; in one radiation piece, any two adjacent radiation arms are perpendicular to each other to form a dual-polarized oscillator; the ultra-wideband oscillator unit further comprises a parasitic branch knot. The parasitic branches are arranged between every two radiation pieces, and the parasitic branches are arranged on the dielectric plate in the horizontal direction and the vertical direction; the radiation part and the parasitic branch knot are coupled and connected to form a frequency expanding structure. According to the utility model, the S parameter of the oscillator unit is optimized by arranging the coupling frequency-broadening structure and the parasitic branch knot, electromagnetic waves are guided through the cooperation of the reflecting strip, the isolating strip and the director, the interference of high frequency to low frequency is reduced, the standing-wave ratio of the antenna is further reduced, and the directivity of the antenna is improved.

The invention discloses a dual-polarization filtering integrated antenna and a manufacturing method, and relates to the technical field of communication, the dual-polarization filtering integrated antenna comprises an antenna assembly and a filtering assembly, the antenna assembly comprises a substrate, a grounding plate and two groups of radiation units, the grounding plate is arranged at the first end of the substrate, and the filtering assembly is arranged at the second end of the substrate; each radiation unit comprises an electric dipole, a magnetic dipole and a feed part, the magnetic dipole comprises two single walls, each single wall comprises a plurality of metal columns, the feed part is arranged at the second end of the substrate, the electric dipole is arranged in the horizontal direction and located between the first end and the second end, and the metal columns are arranged at intervals and form an electromagnetic shielding cavity; the filtering assembly is arranged between the electric dipole and the first end and is positioned in the electromagnetic shielding cavity; the filtering assembly comprises a filter, a vertical transmission line and an improved structure; the filter comprises a plurality of capacitors and inductors; according to the technical scheme provided by the invention, the limitation of contradiction between the structural integration level and the electromagnetic performance in the conventional filtering antenna design can be broken through.

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.