1393 results about "Dual polarized" patented technology

The invention discloses a dual-polarization angle selective surface structure with a wide passband angle and out-of-band steep drop, which is formed by mutually connecting a plurality of periodic units, each periodic unit is provided with at least two metal structure layers from top to bottom, and an air dielectric layer unit is arranged between the adjacent metal structure layers; wherein the metal structure layer comprises a dielectric substrate, an upper surface metal layer and a lower surface metal layer are arranged on the upper surface and the lower surface of the dielectric substrate respectively, and the upper surface metal layer and the lower surface metal layer are connected through a metal via hole formed in the dielectric substrate; the upper surface metal layer and the lower surface metal layer have the same structure, and each periodic unit internally comprises Jerusalem-type metal sheets which are circumferentially distributed around the center of the dielectric substrate; the Jerusalem type metal sheet support arms are mutually connected; the middle through hole of the cross-shaped metal main arm of the Jerusalem metal sheet is the end part of the metal via hole, and the metal via hole is connected with the middle part of the cross-shaped metal main arm at the corresponding position of the upper and lower surfaces of the dielectric substrate.

The invention discloses a method and a system suitable for identifying bird echoes by a Chinese S-band dual-polarization weather radar. The method comprises the following steps: preprocessing observation parameter characteristics of Chinese S-band dual-polarization weather radar base data; establishing a membership function and a weight parameter of each parameter of the weather radar to form a fuzzy logic model; and through comprehensive judgment of statistical bird flock membership function aggregation values, accurate distinguishing of bird flock and rainfall data is realized. Based on four observation parameters and three derivations of the dual-polarization radar, probability density distribution function characteristics of bird flock and rainfall data are analyzed, a fuzzy logic algorithm process and weight parameters suitable for S-band dual-polarization radar bird flock recognition in China are constructed, the accuracy of bird flock and rainfall echo distinguishing is improved, and the probability density distribution function characteristics of the bird flock and rainfall data are analyzed. Through individual verification under different weather conditions such as bird separation, rainfall and clear sky, the effectiveness of the method is verified, and a new technical path is provided for future weather radar biological echo recognition and ecological monitoring.

The invention discloses an SAR sea surface wind speed inversion method based on multiple attention-global enhancement UNet, and the method comprises the following steps: (1), obtaining wind speed data observed by a buoy, carrying out the cleaning and preprocessing, and making a label data set; (2) acquiring dual-polarization ground distance multi-view SAR data collected in an interference width mode IW type; (3) preprocessing the SAR data; and selecting SAR data corresponding to the buoy data information. Dividing the preprocessed SAR data set into a training set, a test set and a verification set; (4) constructing a multiple attention-global enhancement UNet model, namely a CPA-KiTUNet model, training to obtain a sea surface wind speed inversion model, and selecting a test set to test on the trained inversion model to obtain an inversion wind speed result; according to the invention, richness of inversion data is improved, and wind speed inversion can be accurately carried out in a complex scene.

The invention discloses a sea ice classification and intensity inversion method based on deep learning, relates to the technical field of remote sensing image processing, and aims to solve the problems in the prior art, and the method comprises the steps: obtaining original dual-polarization synthetic aperture radar data, and carrying out the preprocessing of the original dual-polarization synthetic aperture radar data; performing superpixel segmentation on the preprocessed data to obtain a plurality of superpixels; calculating the posterior probability of the superpixel by using a conditional random field model, and determining an uncertain superpixel unit; taking the uncertain super-pixel unit as input, outputting sea ice and seawater boundary lines in the uncertain super-pixel unit based on an Ice-WaterNet network model, and combining to obtain a sea ice classification result graph; and performing sea ice concentration inversion on the sea ice classification result map to obtain a sea ice concentration inversion result. According to the method, the inversion precision of sea ice classification and density is improved, and the method can play a more important role in the aspects of global climate change monitoring, marine environment protection, polar region resource development and utilization and the like.

A box dipole radiating element uses a compact quad arrangement of substantially coplanar radiating arms to support slant-polarized radiation, in response to differential-mode currents generated along four sides thereof and in response to common-mode currents, which may be generated in substantially the same plane as the differential-mode currents. A feed signal routing network is provided, which includes a feed signal routing substrate on portions of the radiating arms, first through fourth signal traces on a forward face of the substrate, and first through fourth ground plane segments on a rear face of the substrate. These first through fourth ground plane segments are capacitively coupled to the radiating arms. Each of the signal traces receives a corresponding feed signal, and spans a corresponding air gap between a pair of the radiating arms.

An antenna, in particular for a mobile communication cell site, comprises at least one radiator and a radiator feed being electrically coupled to the at least one radiator, the radiator being a dual polarized dipole radiator, wherein each dipole is formed of two dipole arms and the dipoles are in a crossed arrangement relative to each other, wherein the radiator feed comprises a respective feed line for each polarized dipole and extends within a single feed plane between the dipole arms intersecting the dipoles in the region of the crossing. Further, a cell site comprising such antenna is shown.

The invention discloses a millimeter wave broadband dual circularly polarized antenna and an array. The millimeter wave broadband dual circularly polarized antenna comprises two layers of microwave medium substrates, a bonding medium, a grounding metal plate and a coaxial feed probe. Two E-shaped patch antennas, four small square patches and an L-shaped metal strip are printed on the upper surface of the upper-layer dielectric substrate, gaps are obliquely formed in the centers of the small square patches, the L-shaped metal strip is used for increasing port isolation, and the E-shaped patches excite the four small square patches to achieve the broadband radiation characteristic. And two coaxial feed probes are respectively connected with two output ends with 90-degree phase difference of the 3dB directional coupler on the lower surface of the lower-layer microwave dielectric substrate, sequentially penetrate through the lower-layer microwave dielectric substrate, the bonding medium, the grounding metal plate and the upper-layer microwave dielectric substrate, and are electrically connected with the two E-shaped patch antennas, so that circularly polarized radiation is realized. According to the invention, the circularly polarized antenna with wide beam width, wide impedance bandwidth, wide axial ratio bandwidth and dual polarization characteristics is realized, and the circularly polarized antenna is suitable for potential application requirements of millimeter wave frequency band wireless communication and satellite communication.

The broadband dual-polarization magnetoelectric dipole antenna comprises a first dielectric layer and a second dielectric layer arranged below the first dielectric layer, and the first dielectric layer and the second dielectric layer are connected through a bonding layer to serve as an antenna substrate for supporting a magnetoelectric dipole unit. The magnetoelectric dipole unit comprises metal patches and magnetic dipoles, the metal patches and the magnetic dipoles are used as electric dipoles and magnetic dipoles, the magnetic dipoles penetrate through the first dielectric layer and are arranged on the lower side of the second dielectric layer, and the four metal patches are annularly and uniformly arranged on the upper side face of the first dielectric layer; the shape of the metal patch is a rectangle with semi-elliptical chamfers on two side edges of the outer edge; any metal patch is coupled with two gain patches arranged on the first dielectric layer, and the gain patches are circular. The problem that in the prior art, a magnetoelectric dipole antenna is poor in impedance bandwidth capacity, and therefore the requirement of people for the network information transmission speed cannot be met is solved.

The invention discloses an MT-InSAR deformation monitoring method in combination with reservoir bank landslide deformation spatial-temporal characteristics. The method comprises the following steps: S1, selecting SAR data; step S2, constructing small baseline set InSAR data, including SAR image registration, interferogram combination, differential interference processing, phase filtering, coherence estimation and interferogram optimization combination; s3, based on the dual-polarized SAR intensity image, performing earth surface classification in combination with random forest classification, gradient and direction constraint and a deep neural network; then adaptive homogeneous filtering is carried out on the interferometric phase based on a secondary classification result; s4, combining a plurality of Sigmoid functions and a linear creep and periodic function to obtain an adaptive deformation model of the reservoir bank landslide; s5, performing deformation parameter nonlinear search by using a genetic algorithm to determine an optimal parameter set; on the basis of low-frequency deformation, atmospheric delay and decoherence noise are separated through low-pass filtering of a space domain and high-pass filtering of a time domain, and finally a deformation time sequence and an average deformation rate are recovered.

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 discloses a broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feed. The broadband low-coupling dual-polarization dielectric resonator antenna comprises a dielectric resonator, two pairs of orthogonal coaxial probe pairs, a first Wilkinson power divider, a second Wilkinson power divider, a first feed port and a second feed port, the two pairs of orthogonal coaxial probes are both inserted into the dielectric resonator; each pair of coaxial probes is connected with two output ends of the corresponding Wilkinson power divider; the first feed port excites the pair of coaxial probes to feed the dielectric resonator through the first Wilkinson power divider, and excites a horizontal polarization radiation mode in the x-axis direction; a second feed port excites the other pair of coaxial probes to feed towards the dielectric resonator through a second Wilkinson power divider, and a horizontal polarization radiation mode in the y-axis direction is excited; according to the invention, a dual-polarization radiation mode which is compact in structure, broadband and low in coupling is realized, and each polarization further increases the bandwidth by exciting two resonance modes with close frequency points.

The present invention discloses a high polarization isolation dual-polarization tightly coupled ultra-wideband phased array antenna. It includes a dipole unit, a coaxial feed line, a metal reflective floor, a fishbone cross-shaped patch and a cross-shaped metal wall; the dipole unit includes a horizontal and two vertical dielectric substrates, and the vertical dielectric substrates are orthogonal to each other; two groups of coplanar and mutually perpendicular butterfly-shaped dipole units are printed on the lower surface of the horizontal dielectric substrate; a fishbone cross-shaped patch is embedded at the intersection of the ends of the dipole units, and there is a gap between the patch and the end of the dipole; a patch with an etched groove line is printed on one side of the vertical dielectric substrate; the patch is connected to the dipole; the microstrip line on the upper surface of the horizontal dielectric substrate is connected to the inner conductor of the coaxial feed line, and the dipole is connected to the outer conductor of the coaxial feed line; the fishbone cross-shaped patch is in contact with the cross-shaped metal wall. The present invention realizes high polarization isolation and low cross-polarization of the dual-polarization tightly coupled ultra-wideband phased array in a lower frequency band without the need for a complex feeding network.

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 invention relates to the technical field of antennas, in particular to a dual-frequency dual-polarization low-profile patch antenna. The dual-frequency dual-polarization low-profile patch antenna comprises a first dielectric substrate, a middle metal layer and a second dielectric substrate which are sequentially arranged, the first dielectric substrate is provided with a patch resonator and a plurality of metalized through holes, and the middle metal layer, the patch resonator and the metalized through holes jointly form an SIW resonator. The middle metal layer is provided with a first gap and a second gap. The second dielectric substrate is provided with two first microstrip resonators and two second microstrip resonators. The two first microstrip resonators are respectively used for externally connecting electromagnetic signals in different polarization directions, and the two second microstrip resonators are respectively coupled with the patch resonator and the SIW resonator through the first gap and the second gap. According to the dual-frequency dual-polarization low-profile patch antenna provided by the invention, the problems of high overall profile thickness and large size of the existing dual-frequency dual-polarization patch antenna are solved.

The invention relates to a three-dimensional stacked high-power multi-channel dual-polarization airtight packaging T / R assembly, which comprises a power supply modulation layer, a multifunctional processing layer and a power amplifier low-noise amplifier layer which are sequentially stacked from bottom to top, and electrical interconnection among the three circuit layers and with the outside is realized by adopting the BGA solder balls. The three circuit layers adopt LTCC (Low Temperature Co-Fired Ceramic) or HTCC (High Temperature Coefficient Chip) to realize an integrated packaging structure with a cavity; the interior of the integrated structure is divided into a plurality of same independent cavities so as to accommodate circuits and structures of the channels; a signal transmission structure and a grounding through hole array are arranged in the cavity wall of the integrated structure, so that electrical interconnection, impedance matching and electromagnetic shielding inside and outside the package are realized; each cavity is sealed in an independent airtight mode through a metal cover plate. When necessary, a wave-absorbing material is added in the cavity to prevent self-excitation of the assembly. According to the invention, the product structure and the production process are simplified, the production efficiency, the packaging efficiency and the yield are improved, and the cost is reduced; the power capacity and the reliability of the product are improved, and the maintainability is good.

The invention discloses an SAR image mountain shadow dynamic threshold removal method based on an inverse exponential function, and relates to the technical field of remote sensing image data processing, and the method comprises the steps: preliminarily extracting a water body region based on an SAR image through employing a dual polarization water body index SDWI, and randomly generating sample points in the range of the water body region; assigning corresponding elevation and gradient attributes to each sample point through digital elevation data SRTM, and performing artificial interpretation by using an optical image to obtain a sample data set containing two types of sample points of a mountain shadow and a water body; and removing abnormal values of a sample data set through a quartile distance method, performing thinning processing on sample points to calculate a demarcation point of the two types of sample points, and constructing a demarcation function model of an inverse index for distinguishing a mountain shadow and a water body. Therefore, by adopting the SAR image mountain shadow dynamic threshold removal method based on the inverse exponential function, the false water body region caused by the misjudgment of the terrain shadow is effectively eliminated, and the authenticity and the consistency of the water body space distribution are improved.

An apparatus includes a substrate, a first antenna panel, a second antenna panel, and an antenna isolator. The first antenna panel is coupled on the substrate and includes an array of first antenna elements. The second antenna panel is coupled on the substrate and includes an array of second antenna elements. The antenna isolator is coupled on the substrate and including a plurality of walls extending outwardly from the substrate along a length of the substrate between the first antenna panel and the second antenna panel. The antenna isolator reduces reduce wave propagation between the array of first antenna elements and the array of second antenna elements.

The invention discloses a sea ice type identification method and device based on a synthetic aperture radar image, and belongs to the technical field of satellite remote sensing marine monitoring. The method comprises the steps of 1, preprocessing a dual-polarized SAR image, and extracting input feature data; step 2, constructing a finely labeled sea ice type data set covering a generic north pole scene by combining visual interpretation and external auxiliary data; step 3, inputting the constructed finely labeled sea ice type data set into a sea ice type identification model improved based on a DeepLabv3 + architecture, and performing iterative optimization through a multi-graphics card parallel training mode to generate a high-precision sea ice type identification model; and 4, performing sea ice type identification on the extracted input feature data by using a high-precision sea ice type identification model. According to the method, the incidence angle dependency related to the sea ice type in the original SAR data is more accurately reserved, and the precision of the model is improved.

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.

A dual-polarization (DP) intensity-modulated direct detection (IMDD) receiver includes an input port configured to receive input light; an optical polarization splitter configured to split the input light into a pair of optical transmission paths; a pair of photodetectors including (i) a first photodetector configured to detect light at a first carrier frequency and output an electrical signal into a first electrical transmission path, (ii) a second photodetector configured to detect light at a second carrier frequency and output an electrical signal into a second electrical transmission path, wherein the first carrier frequency and the second carrier frequency are separated by a frequency difference; and an electrical 2×2 multi-input-multi-output (MIMO) polarization demultiplexer configured to input the first electrical transmission path and the second electrical transmission path and perform electrical 2×2 MIMO polarization demultiplexing to output a first demultiplexed signal and a second demultiplexed signal.

A dual-band, tri-band, or higher-order multi-band array of antenna elements, with each element, or subsets of elements, connected to multiple radios at each antenna port. In one embodiment, an array comprises a 128 element Massive MIMO array having 64 horizontally-polarized (H-pol) and 64 vertically-polarized (V-pol) elements configured to provide dual polarization capability over multiple bands to accommodate highly-configurable simultaneous 4G and 5G operation.

The invention belongs to the technical field of high-orbit satellite communication. A ground station antenna S, Q, V multi-band dual-polarization feed source implementation device comprises an S-band dual-polarization feed source network, the S-band dual-polarization feed source network comprises a polarization switch, first duplexers, first sum-difference networks, a polarizer assembly and an S feed source horn, the polarization switch is connected with the two first duplexers, each first duplexer is connected with the first sum-difference network, and the S feed source horn is connected with the second duplexers. The output of one first sum-difference network is connected to a left-hand polarization port of each polarizer assembly, the output of the other first sum-difference network is connected to a right-hand polarization port of each polarizer assembly, and each polarizer assembly is connected with an S feed source horn; the Q / V frequency band feed source network comprises two second duplexers which are respectively connected with a quadrature device, a polarizer is respectively connected with the quadrature device and a tracker, and the tracker is respectively connected with a difference signal synthesis network and a Q / V corrugated horn; and the S feed source horns are arranged around the Q / V corrugated horns. And the optimal utilization effect of space and signal receiving and transmitting efficiency is achieved.

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 an ultra-low side lobe row feed array. The main types of current engineering include a traveling wave waveguide array and passive row feed with unequal power division feed. Due to the existence of an azimuth frequency scanning angle, zenith scanning blind spots exist, the larger the frequency deflection angle is, the larger the scanning dome blind area is, and azimuth beams are fixed, so that multiple beams cannot be formed; although the beam points to the normal direction, the defect of large loss exists. Aiming at the defects in the prior art, the invention provides the ultra-low side lobe dual-polarization active row feed array with variable unit number and unequal power division, a form based on an unequal unit active subarray is adopted, dual-polarization active row feed is realized, and the ultra-low side lobe dual-polarization active row feed array has the characteristics of ultra-low side lobe, low cost and low loss.