154 results about "Scattering cross-section" patented technology

The invention discloses a phased array weather radar calibration method based on a generalized metal ball calibration theory. Comprising the following steps: in a microwave anechoic chamber, collecting two-dimensional antenna pattern data of a phased array weather radar in at least one working mode and pointing to a plurality of different beams; performing numerical integration on the two-dimensional antenna pattern data, calculating a combined beam main lobe solid angle of the transmitting antenna and the receiving antenna, and calculating an equivalent beam width product; calculating a calibration theoretical reflectivity factor of the metal ball based on the product of the theoretical radar scattering sectional area and the equivalent beam width of the metal ball; actual detection echo data of the phased array radar on the metal ball under different working modes and beam pointing is acquired, and an actual reflectivity factor is calculated; and comparing the actual reflectivity factor with the calibration theoretical reflectivity factor to complete calibration of the phased array weather radar. Aiming at the non-Gaussian working mode of the phased array weather radar, the reflectivity factor of the phased array weather radar can be quantitatively evaluated, and the radar detection performance is improved.

The invention discloses a broadband circular polarization metasurface antenna with a low radar cross section. The broadband circular polarization metasurface antenna is composed of a top layer 4 * 4 antenna array, a middle layer metal ground, a bottom layer one-to-sixteen sequential rotation feed network and two dielectric plates among the three layers. The antenna array is composed of four subarrays which are arranged in a 2 * 2 period, and the four groups of subarrays are symmetrical up and down and left and right along the center of the antenna array and are arranged in a chessboard shape. Each antenna unit in the antenna array comprises a bow-tie-shaped metal patch, and the patch is connected with the output end of the feed network at the bottom layer through a first metalized through hole; the feed network is composed of three one-to-two second-order Wilkinson power dividers, four 90-degree phase shifters, twelve T-shaped power dividers and a plurality of sections of 50-ohm microstrip lines. Through fusion design of the antenna and the metasurface, the problem that in the design process of the metasurface antenna with the low radar cross section, the antenna aperture is increased due to the fact that the antenna and the metasurface are independently designed firstly and then integrated is solved, and the low radar cross section characteristic of the broadband and the high-performance circular polarization radiation characteristic are achieved.

The invention discloses a scattering center modeling method under continuous distance variation, which comprises the following steps of: performing far-field frequency sweeping, azimuth sweeping and pitching sweeping three-dimensional radar scattering cross section simulation on a target by adopting simulation software to obtain far-field three-dimensional scattering data, and performing near-field to far-field scanning distance radar scattering cross section simulation on the target to obtain continuous distance scattering data; according to the far-field three-dimensional scattering data, scattering images of a target in three dimensional directions are obtained; performing amplitude parameter estimation to obtain a target three-dimensional scattering center model; the distance and the attitude angle from the antenna to each scattering center are obtained, a plurality of scattering fields of each scattering center are reconstructed, and a total scattering field is obtained after vector superposition. According to the method, the amplitude of the scattering center is corrected through the position and angle geometrical relationship between the scattering center and the near-field antenna, scattering data at any distance can be reconstructed through far-field data, and the modeling efficiency is greatly improved while the modeling precision is ensured.

The invention discloses a method for estimating a radar scattering cross section of a coated medium target, relates to the field of radar application, is suitable for an electrically large coated medium target, and improves the calculation efficiency of the radar scattering cross section while ensuring the calculation precision. The method comprises the following steps: calculating a reflection coefficient of a target surface by adopting a stepping method based on target coating medium characteristics; respectively calculating induced electromagnetic currents of different surface elements after the target is subdivided; based on the induction electromagnetic currents of different surface elements, the scattering electric field of each surface element of the target is calculated, the scattering electric fields of the visible surface elements are summed to obtain the total scattering electric field of the target, and the radar cross section RCS is calculated according to the total scattering electric field. The method can be suitable for electromagnetic characteristic analysis of the electrically large-size coating target, and the calculation precision is improved while the calculation efficiency is ensured.

The present invention discloses a broadband radar cross section reduction metasurface with reflection and scattering characteristics, which includes a number of square structural units arranged in a set manner. Each square structural unit includes a bottom metal plate unit, an upper special-shaped metal strip unit, and a dielectric substrate unit disposed between the bottom metal plate unit and the upper special-shaped metal strip unit. The present invention can integrate two special functions within a relatively wide frequency band, namely the reflection and scattering of incident electromagnetic waves, so as to achieve the functions of specular reflection and RCS reduction.

The invention discloses a flexible conformal array structure scattering characteristic analysis method and device, and the method comprises the steps: carrying out the fitting of a whole flexible array surface arc length through employing a plurality of osculating circles through the evaluation of a flexible array surface structure, and determining the number of osculating circles divided by a whole arc length curve through iteration; constructing feature units to realize reconstruction of the whole flexible array plane, and calculating an initial excitation coefficient, a feature weight coefficient and a mutual coupling coefficient between the units of each flexible unit; and constructing and solving a balance equation to obtain an actual excitation coefficient of each flexible unit considering the mutual coupling effect, and calculating a total scattering field of the flexible array structure to obtain a radar cross section of the flexible array. According to the method, the scattering characteristic analysis of the flexible conformal array structure is realized, the problem of inconsistent deformation degree of each unit caused by the flexible structure is considered, a small number of characteristic units are used for replacing the units in the actual flexible array structure through an iteration mode, and the analysis efficiency is improved.

The invention discloses a laser radar ranging process simulation method suitable for a complex scene. The method belongs to the field of full-waveform laser radar ranging simulation. The method comprises the following steps: setting initial parameters, and calculating to obtain a backscatter cross section function of a complex scene; an ideal echo signal is obtained through convolution; generating random noise and superposing the random noise with the ideal echo signal; filtering the signal on which the noise is superposed; carrying out adaptive threshold detection on the filtered signal to judge whether an effective signal exists or not; determining an echo pulse arrival time by using a standard waveform fitting method, and calculating to obtain a distance measurement result; and carrying out multiple detection to obtain laser radar ranging statistical characteristics. According to the invention, the Monte Carlo ray tracing algorithm is introduced to realize the calculation of the backscattering cross section function of the complex scene, the transmission process of the light beam in the complex scene is truly restored, and the adaptive threshold detection method is adopted to effectively reduce the false alarm probability of the laser radar system and improve the detection probability.

The invention discloses an ultra-wideband RCS (radar cross section) reduction metasurface with mixed wave absorption and diffuse scattering and a wave-transparent window, and belongs to the technical field of electromagnetic metamaterials. The metasurface adopts a four-layer cascade structure and comprises a first layer of polarization conversion structure, a second layer of 2.5 D lossy structure, a third layer of Jerusalem cross-shaped lossy structure and a fourth layer of frequency selective surface structure. By loading a lumped resistor at a specific position and adopting a metal through hole interconnection technology, dual functions of radar cross section reduction in a 1-20GHz ultra-wideband and low insertion loss wave transmission in a 8-12GHz frequency band are realized. The structure of each layer adopts a highly symmetrical design and has the characteristic of polarization insensitivity, and meanwhile, by optimizing interlayer air gaps and dielectric material selection, the structure compactness is realized on the premise of ensuring the performance. The method has important application value in the aspect of integration of stealth equipment and a communication system.

The invention discloses a single-layer fully-polarized reflective double-sided image metasurface and a design method. The reflective double-sided image metasurface is composed of a positive structure metasurface, a complementary structure metasurface and an intermediate dielectric substrate. The positive structure metasurface is formed by periodically extending and arranging m * m polarization conversion units in a plane, and arbitrary polarization conversion and phase regulation and control of electromagnetic waves of a specific frequency band are achieved. The polarization conversion unit is composed of an upper-layer chamfered rectangular patch or elliptical patch metal; the complementary structure metasurface is formed by periodically extending and arranging m * m complementary I-shaped units in a plane, and radar cross section reduction of back incident electromagnetic waves is achieved. Each complementary I-shaped unit is composed of a circular ring groove and I-shaped ring groove metal. The reflective double-sided image metasurface can realize polarization conversion under the excitation of forward arbitrary polarization electromagnetic waves and is used for near-field energy detection, can reduce the radar cross section under the excitation of backward orthogonal electromagnetic waves, and has the advantages of high working efficiency, small thickness and the like.

The invention discloses a multi-modal site identification method based on a multi-scale self-attention mechanism, and belongs to the field of site identification. The implementation method comprises the steps of performing multi-modal feature fusion on multiple feature scales through a self-attention mechanism by simultaneously taking a look-around multi-view RGB image, a laser radar environment point cloud and a millimeter wave radar environment point cloud as input, generating a multi-modal global LCGD descriptor, and screening k candidate samples by using the LCGD descriptor according to an Euclidean distance; a point cloud scattering sectional area probability density function is extracted from millimeter wave radar environment point clouds, the total reordering distance is calculated, k candidate samples are reordered, and the coordinates of the candidate sample with the minimum reordering distance serve as the coordinates of the vehicle at the current moment. The method can be used for solving the problem of poor robustness for changes of environmental factors such as illumination and weather and changes of the visual angle of the vehicle in the existing site identification technology, and the identification precision of the site identification method and the generalization under different environmental conditions are enhanced.

The invention discloses a large-scale cluster target electromagnetic scattering analysis method and system based on a parallel equivalence principle, and the method specifically comprises the steps: carrying out the geometric modeling and equivalent surface construction of each target unit in a cluster target, and generating discrete surface element information; starting a parallel computing process, and distributing a target-equivalent face by adopting a greedy algorithm; a calculation process group corresponding to each sub-domain is partitioned according to a two-dimensional Cartesian coordinate grid, a transfer operator matrix between the sub-domains is partitioned according to the same two-dimensional calculation process grid, global parallel iterative solution circulation is carried out, and the equivalent surface flow of the sub-domain is updated; and the converged equivalent surface flow of each sub-domain is used as an equivalent source, and the radar cross section RCS of the whole cluster target in the specified observation direction is synthesized through far-field radiation integration. The method has good parallel expandability and calculation efficiency, is suitable for complex and diverse cluster target scenes, reduces memory requirements and calculation time overhead, improves calculation efficiency, and is high in engineering practicability.

The invention provides a ship detection-oriented multi-source remote sensing image fusion method, a ship detection-oriented multi-source remote sensing image fusion medium and a ship detection-oriented multi-source remote sensing image fusion system, and belongs to the technical field of remote sensing images. Constructing an electromagnetic scattering constraint model based on physical optical approximation and a geometric diffraction theory to calculate a predicted value of the backscattering cross section of the target, introducing a fusion cost function, generating a fusion weight matrix by adopting an adaptive feature weighting model, and performing multi-scale fusion on the image through hypercomplex wavelet transform; and iteratively optimizing the fusion result by using an information diffusion heat conduction equation, and performing physical consistency correction to output an enhanced fusion image, thereby solving the technical problem of poor physical consistency of the fusion result caused by lack of physical model constraint when the synthetic aperture radar image and the multispectral image are fused.

The invention relates to the technical field of radar target characteristic analysis, in particular to a radar near-field target polarization characteristic analysis method based on a vector Green function. Firstly, a target three-dimensional scattering point model is constructed, a coordinate-based scattering coefficient is defined, a full-polarization observation mode is designed, a near-field measurement matrix is calculated based on a vector Green function, and an observation model is constructed. Secondly, designing a fusion far-field constraint orthogonal matching pursuit (OMP) algorithm, realizing high-precision inversion of scattering coefficients, calculating a target far-field single-station RCS (HH / HV / VV mode) through dynamic polarization-based projection and phase compensation, and establishing a near-far field scattering characteristic mapping model; according to the method, near-field three-dimensional imaging and far-field polarization characteristic analysis are fused, the problem of insufficient cross polarization component recovery in a traditional method is solved, and the method has the advantages of high-resolution imaging, multi-physical field collaborative optimization, adaptive noise suppression and the like, and can be applied to the fields of stealth target recognition, radar cross section testing, unmanned aerial vehicle navigation and the like.

The invention discloses a radar cross section measuring system and method, and relates to the technical field of electromagnetic scattering measurement, and the system comprises a transmitting antenna which is used for transmitting a step frequency broadband signal; the spiral phase plate rotating disc is vertically and rotatably arranged in front of the transmitting port surface of the transmitting antenna through a rotating assembly, a plurality of spiral phase plates with different modalities are arranged on the spiral phase plate rotating disc, and the spiral phase plates modulate step frequency broadband signals, generate vortex electromagnetic waves with corresponding modalities and transmit the vortex electromagnetic waves to a target on the same horizontal plane; the receiving antenna is used for receiving a near-field echo signal reflected by a target on the same horizontal plane; and the controller is used for receiving the near-field echo signals of the vortex electromagnetic waves in different modes and processing the near-field echo signals to obtain the radar cross section of the target. The radar cross section of a large-size radar target can be quickly, accurately and effectively obtained through the measurement system and the measurement method which are used for near-field measurement and are converted into far-field conditions.

The invention discloses a method and a system for predicting luminosity of a low-earth-orbit satellite during transit, and the method comprises the steps: obtaining historical observation data, and constructing a comprehensive parameter data set of luminosity, position and related observation information of the low-earth-orbit satellite at different observation moments; equivalently representing the optical scattering sectional area of the low-orbit satellite by using the sectional area of the sphere generating the same brightness; key factors influencing the equivalent sectional area are determined; integrating the obtained parameterized relationship of the equivalent sectional area into a ball model formula to obtain a luminosity prediction model; taking the obtained comprehensive parameter data set as the input of the luminosity prediction model, and optimizing the luminosity prediction model through a data driving method to obtain an optimized luminosity prediction model; and substituting to-be-predicted low-earth-orbit satellite data into the optimized luminosity prediction model to obtain a luminosity prediction value of the low-earth-orbit satellite in the transit period. According to the method, the correction ball model is fitted through observation data, the luminosity prediction model is constructed in combination with key parameters, and the brightness of the low-orbit satellite is accurately predicted.

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.

The invention discloses a circularly polarized antenna with an RCS (radar cross section) suppression characteristic in the field of antennas. The circularly polarized antenna comprises a first dielectric substrate and a second dielectric substrate which are stacked, a metasurface structure array is arranged on the first dielectric substrate; the metasurface structure array comprises a plurality of distributed metasurface units; the plurality of first metal patches are arranged to form a convex metasurface module, and the plurality of second metal patches are arranged to form a concave metasurface module; the convex metasurface module is embedded into the concave metasurface module to form a metasurface unit; a metal floor is arranged between the first dielectric substrate and the second dielectric substrate; the metal floor is provided with a coupling slot; one side, far away from the first dielectric substrate, of the second dielectric substrate is provided with a sequential rotation feed network; energy is input by the sequential rotation feed network, and the metasurface structure is excited through the coupling gap to form a radiation signal; good radiation performance is still kept on the premise that the radar cross section of the antenna is reduced.

The invention discloses a super scattering and zero forward scattering coordinated regulation system and method based on optical gain, and relates to the technical field of optical scattering enhancement. The method comprises the steps that a space rectangular coordinate system is constructed; the cylindrical scatterer is vertically placed along the z axis; a transverse magnetic wave emitted by an emitting device is incident along the x axis; the emitting device emits the transverse magnetic wave, the transverse magnetic wave interacts with the cylindrical scatterer, and a total magnetic field of a free space in coordinates of the cylindrical scatterer is detected by using a detection device. Scattering coefficients and a total scattering cross section of different scattering channels of the cylinder are obtained based on the total magnetic field, key parameters for controlling scattering intensity and directivity are obtained based on the scattering coefficients and the total scattering cross section, and a scattering pattern is obtained by adjusting the key parameters of the cylindrical scatterer. The invention provides a new way for designing advanced optical devices applied to the fields of sub-wavelength antennas, optical communication, radar sensing, imaging and the like.

The invention discloses a method, a system, equipment and a medium for evaluating the gas-bearing property of a water-flooded area, and the method comprises the steps: confirming three pieces of quantitatively measured skeleton information and fluid medium information in a time domain through different minerals and fluid components, and calculating a fast neutron scattering cross section according to pulse neutron logging data; carrying out qualitative identification on the gas reservoir by combining the fast neutron scattering cross section and the stratum hydrogen-containing index; according to the fast neutron scattering cross section, the thermal neutron capture cross section, the hydrogen content index and the respective volume content, a linear equation set is established, and the simultaneous equation set is solved to obtain the content of different fluid components in the stratum. The gas reservoir evaluation method solves the problem that a conventional gas reservoir evaluation method is seriously influenced by detection depth, borehole environment, invasion, low contrast ratio and pore fluid properties, and does not depend on conventional logging curves and electrical characteristics.

The invention discloses a laser radar temperature measurement method and device based on oxygen atom vibration Raman scattering, and particularly relates to the technical field of laser radar atmosphere detection, and the method comprises the steps: calculating a differential Raman scattering cross section value of a to-be-measured altitude in a resonance Raman scattering transition spectral line; constructing a radar parameter equation; determining a relational expression between the ratio of the Stokes Raman scattering signal to the anti-Stokes Raman scattering signal and the temperature; and determining the absolute temperature of the atmosphere at the altitude to be measured based on the differential Raman scattering cross section value of the altitude to be measured in the resonance Raman scattering transition spectral line and the relational expression of the ratio of the Stokes Raman scattering signal to the anti-Stokes Raman scattering signal and the temperature. The method can overcome the problem that observation objects of a traditional method are limited in spatial distribution, is wide in temperature measurement range, is not easily influenced by other scattered signals, and is stable and reliable.

The present application relates to the technical field of microwave measurement and reverberation chamber, and particularly relates to a test model of total scattering cross section of a reverberation chamber stirrer based on mirror principle and application, comprising: constructing a mirror model, and obtaining the number of mirror objects after multiple reflections and the total surface area of the mirror model; obtaining the time constant of the reverberation chamber; obtaining the damping time constant of the stirrer; and constructing the test model of the total scattering cross section of the reverberation chamber stirrer. The present application directly reflects the propagation mechanism of electromagnetic waves in the reverberation chamber and the scattering characteristics of the stirrer on the electromagnetic waves, has a certain guiding effect on the optimization of the stirrer and the test configuration, helps to understand, analyze and reduce the un-stirred energy in the reverberation chamber, and finally realizes the effective improvement of the performance of the reverberation chamber.

The invention provides a satellite-borne SAR radiometric calibration precision evaluation method and system, a medium and equipment, and belongs to the technical field of radiometric calibration, and the method comprises the steps: recognizing and analyzing an error source which affects the calibration precision; selecting a flat area as a calibration field according to the error source; arranging a plurality of standard calibration devices with known radar cross sections in an imaging band according to the satellite top crossing position and the wave position; controlling the satellite-borne SAR to irradiate the selected area at a specified wave position, acquiring and processing scene echo data, and generating an SAR image; according to the SAR image and a known radar cross section, calculating a radar cross section measurement value; and evaluating the satellite-borne SAR radiometric calibration precision according to the measured value of the scattering sectional area and the true value of the scattering sectional area. According to the method, multiple types of error sources in the radiometric calibration link are identified and analyzed, the calibration field is selected and multiple standard calibration devices are arranged based on the error sources, and the actually measured data are compared with the true value, so that the accuracy and credibility of radiometric calibration precision evaluation are improved.

The present invention discloses a method for calculating a photon-atom coherent scattering cross section that takes into account the molecular interference effect. For a specific molecule, the Thomson differential scattering cross section of each element contained in the molecule is first calculated; secondly, a molecular interference function of the molecule to be calculated is obtained based on experimental measurement or molecular dynamics simulation; then, the molecular interference function is used to correct the atomic shape factor of each element contained in the molecule based on the independent atomic shape factor approximation method to obtain an atomic shape factor that takes into account the molecular interference effect; then, the factor is integrated to obtain an integrated atomic shape factor in a continuous energy ACE format database used by a Monte Carlo program; at the same time, the atomic shape factor that takes into account the molecular interference effect is used to correct the Thomson differential scattering cross section to obtain a differential scattering cross section of a coherent scattering reaction that takes into account the molecular interference effect, and the energy angle integration of the modified Thomson differential scattering cross section can be used to obtain a multi-group coherent scattering cross section used by a deterministic program.

This invention belongs to the field of computational electromagnetics numerical simulation and provides a simulation method for electromagnetic scattering of thin-coated targets based on Schur complement preconditions. First, for the IBC scattering target to be solved, equivalent surface current and equivalent surface magnetic current are introduced as independent unknowns. The electromagnetic scattering solution equation is established using SDIE and then discretized. Next, the impedance matrix is ​​decomposed into near-field and far-field matrices using an octree structure. For the near-field matrix, key operator sub-blocks are explicitly assembled and extracted. Then, approximate operators in block diagonal form and Schur complement operators are constructed and approximately inverted. Simultaneously, the diagonal product of intermediate blocks is pre-calculated and stored based on the approximate operators. Finally, the constructed preconditions are applied to the GMRES iterative solver. When the iteration error reaches the preset convergence criterion, the current and magnetic current distributions on the target surface are output. Further calculations of radiation characteristic parameters such as the target's radar cross section are then performed, achieving low-cost, high-efficiency, and easily parallelizable electromagnetic simulation solutions.

This invention relates to the field of RCS testing technology, specifically to an image-domain-based near-field anomalous scattering filtering method. The method first obtains a raw near-field image by near-field imaging of the acquired near-field swept data. Second, based on set anomalous scattering judgment conditions, the anomalous scattering centers are identified and extracted. Then, using a point target as a reference object, the scattering field distribution in the determined filtering area is simulated and reconstructed to generate a new near-field image. Finally, it is determined whether the new near-field image meets the anomalous scattering judgment conditions. If not, a filtered near-field image is generated. By identifying and removing scattering centers that do not belong to the test target from the two-dimensional image generated by the near-field imaging, near-field clutter suppression and higher-precision radar cross section testing are achieved.

The present invention relates to a phased array tracking method based on four-dimensional joint weighted dynamic pre-switching, and belongs to the field of phased array communication technology. The present invention includes: updating the spatiotemporal correlation parameters to the target historical motion trajectory database, generating the target state prediction value based on the UKF prediction method; starting the four-dimensional joint gradual weighting program, performing linear phase interpolation in the time delay dimension, and generating a phase-continuous control signal; solving the mutual coupling matrix, establishing a cross-array phase mapping model based on cubic spline interpolation, and compensating for the residual phase error; dynamically adjusting the number of effective array elements participating in beam synthesis according to the real-time radar scattering cross section, generating the final beam pointing signal, and completing the stable relay tracking of the current cycle. The present invention solves the problems of phase jump and signal attenuation during multi-array switching, and is suitable for continuous tracking of UAVs in high-speed moving scenarios.

The present application relates to a kind of radar scattering cross section test methods based on deep learning and ISAR imaging inversion, the method includes using ISAR imaging test mode to obtain target and calibration body broadband radar scattering echo signal, calibration processing and applying filter-inverse projection imaging algorithm to carry out ISAR imaging, application completes the deep learning model of accurate extraction ISAR image scattering signal area, application FFT transform-interpolation integral ISAR imaging inversion algorithm high-precision inversion reconstruction RCS value, change ISAR imaging aperture center azimuth angle traversal acquisition target all azimuth angle RCS data.The radar scattering cross section test method based on deep learning and ISAR imaging inversion provided by the present application solves the accurate extraction ISAR image scattering area and ISAR image high-precision inversion reconstruction RCS and other test practical problems, expands RCS data acquisition method.

A spherical designer electromagnetic surface plasmon open resonator is provided. The open resonator includes a resonator inner core and a resonator outer shell. The resonator inner core is located in an inner center of the resonator outer shell, and the resonator inner core and the resonator outer shell are coaxial. The disclosure provides a device that implements the superscattering function for incident waves in all incident directions and in all polarization directions, and a spherical open resonator is implemented. The scattering cross section of the disclosure can be more than five times greater than that of a metal sphere of the same size, and the operating frequency can be flexibly designed. By utilizing the characteristic that the scattering cross section of the spherical designer electromagnetic surface plasmon resonator is much greater than its own geometric cross section, the electromagnetic super-scattering device can be implemented.

The invention relates to a multi-probe near-field electromagnetic characteristic test system and method based on an ultra-wide-band plane wave synthesis method, and the system comprises a test darkroom, a plurality of ultra-wide-band plane wave synthesizers, one or more supports, and a tested object. The plurality of ultra wide band plane wave synthesizers are arranged on one or more brackets, and the tested object is arranged in one bracket or among the plurality of brackets; at least one of the plurality of ultra-wideband plane wave synthesizers serves as a transmitting antenna, a transmitting plane wave probe of the ultra-wideband plane wave synthesizers is used for transmitting uniform plane waves to a measured object, the rest ultra-wideband plane wave synthesizers serve as receiving antennas, and receiving plane wave probes of the ultra-wideband plane wave synthesizers are used for receiving the uniform plane waves reflected by the measured object. Therefore, the double-station or multi-station electromagnetic characteristic of the tested object can be tested. According to the invention, measurement of various electromagnetic characteristics such as a target double-station / multi-station radar scattering cross section and an antenna radiation pattern can be realized.

The application provides a radar scattering cross section (RCS) acquisition method based on CBFM-AIM-EDM, and the implementation steps are as follows: initializing parameters; calculating main characteristic basis functions of each sub-region based on CBFM-AIM; calculating secondary characteristic basis functions of each sub-region based on CBFM-AIM-EDM; constructing a reduction matrix and acquiring the radar scattering cross section (RCS). The main characteristic basis functions and the secondary characteristic basis functions of each sub-region are calculated by using the characteristic basis function method (CBFM), then the RWG basis functions and their divergence on each sub-region can be projected on the matrix grid respectively by using the adaptive integration method (AIM) to obtain the Topelitz matrix, so that the calculation speed is accelerated, the RCS acquisition efficiency is improved under the condition of ensuring the accuracy, and the coupling between two sub-regions of the target is equivalent to the coupling between equivalent dipoles by using the equivalent dipole moment method (EDM), so that the RCS acquisition efficiency is further improved.