59 results about "Array factor" patented technology

The invention relates to an OAM generator based on a parabolic reflector and a circular-ring-shaped array feed source. The OAM generator shown in the picture (a) is composed of the circular-ring-shaped array feed source, the rotary parabolic reflector and a supporting mechanism. A structure of the circular-ring-shaped feed source is shown in the picture (b) and used for generating an original OAM radio frequency wave beam, N array elements distributed at equal intervals along the circumference are utilized, the stimulation amplitudes of the array elements are equal, and phases are shown in the mode shown in the specifications, wherein n represents the serial number of the array elements, l represents an OAM mode, a spiral phase item in the shape shown in the specifications can be formed in an array factor of the feed source, and an OAM radio frequency wave beam with the pattern number being l can be generated. When the OAM mode of the generator during working needs to be adjusted, only the phase relation among various array element currents needs to be reset. The rotating parabolic reflector is used for improving the quality of the OAM radio frequency wave beam and can narrow the OAM radio frequency wave beam, directionality and radiation gains can be improved, and the transmission distance of an OAM radio frequency carrier is increased. The OAM generator based on the parabolic reflector and the circular-ring-shaped array feed source can be applied to a wireless communication system, and compared with the existing wireless technology, the system capacity and the spectrum effectiveness can be greatly improved.

An adaptive antenna system may be used with a GPS system to improve operation in the presence of interference signals. A resulting adapted antenna pattern will cause array pattern distortions affecting GPS satellite signals received at some signal arrival angles. By determining values of array factor distortions applicable to a GPS satellite signal received at a specific arrival angle via a specific adapted array pattern, a correction signal may be developed for use to mitigate the effect of the applicable array factor distortion. By use of satellite angle data, navigational data, or both, a predictive angle value of a future arrival angle of a satellite signal may be identified. By developing a correction signal applicable to that future arrival angle, corrections for arriving signals can be applied without reliance on stale values. Corrections may be made to the received satellite signal or may be supplied to the GPS system for corrective use during processing of the received signal. Other systems and methods applicable to reception of GPS, broadband or other signals via array antennas with or without adaptive processing are also described.

The invention provides an array antenna Taylor-Schelkunoff polynomial design method, and relates to a modular array antenna. The method includes the steps that 1, array antenna parameters are selected; 2, the array antenna is divided into at least two modules; 3, a Taylor synthetic method is selected to calculate an array factor directional diagram of the modules; 4, an SPM synthetic method is selected to obtain a directional diagram with null steering, and the null steering angle is made to correspond to the grating lobe angle of the array factor directional diagram; 5, a directional diagram multiplication principle is adopted, the grating lobe of the array factor directional diagram is offset, the low-minor lobe radiation directional diagram is achieved, and the excitation amplitude of all arrays is controlled through the preset null steering angle; 6, if the obtained low-minor lobe radiation directional diagram cannot meet the design requirement, step 2 is executed, and the array antenna is regrouped. According to the array antenna Taylor-Schelkunoff polynomial design method, the excitation amplitude of all the arrays can be controlled through the preset null steering angle, a modular feed network is achieved through an equipower distributor with the phase and impedance being matched, the radiation loss is reduced, and the design and manufacturing cost is lowered.

The invention discloses an optimizing method for processing signal errors of different array antennas, and relates to the signal processing field of the antenna arrays, especially to an optimized design method for processing errors of the different arrays. According to measured amplitude array and array element phase error of reception signals of an array, an IA algorithm is used to determine an array factor model, an accurate change boundary of a power directional diagram is calculated, a convex optimization model of an array excitation amplitude is established, and a power directional diagram satisfying the performance requirement is obtained in an integrated way according to an obtained optimization excitation weight. Compared with an IA-PSO algorithm in a global random searching manner, the method of the invention can be used to obtain a better array excitation parameter under the same error, and the amplitude error of the array is kept relatively stable. Important parameters including the sidelobe level, the main lobe width and the array direction coefficient can be controlled effectively in antenna design.

The present invention discloses a large-scale phased antenna array wide-angle scanning optimization method based on space mapping. The large-scale phased antenna array wide-angle scanning optimization method based on space mapping comprises the following steps of: establishing an array antenna model; under the condition of not considering mutual coupling, obtaining a directional diagram of an array by multiplying directional diagrams of array elements by an array factor so as to establish a rough mode of array antenna space mapping, optimizing the rough model and determining the optimal design parameter of the rough model; processing a fine model by adopting a full-wave analysis moment method, enabling response of the rough model to approach to response of the fine model by parameter extraction and establishing a mapping relation between the rough model parameter and a fine model parameter; and obtaining the predicted parameter of the fine model by utilizing the optimal design parameter of the rough model and inverse mapping of the established mapping relation and if the predicted parameter of the fine model does not meet the design requirement, carrying out iterative updating on the mapping relation until the predicted parameter of the fine model meets the design requirement. According to the method, the designed parameter is integrally optimized and on the premise of ensuring accuracy, calculating time is saved.

The present invention discloses a moving target DOA (direction of arrival)-based null broadening 3D-MIMO beamforming method and belongs to the interference suppression field. The method includes the following steps that: on the basis of existing 3D-MIMO beamforming, an antenna array of M*N array elements is constructed on an xy plane for a base station and a certain mobile terminal which communicates with each other; the weight of each of array factors is calculated; DOA information between a target mobile terminal and the base station as well as between an interference mobile terminal and the base station is determined; the weight of each array factor is re-adjusted according to the DOA information; and constraint is applied to angle regions around a desired direction and an undesired direction, null broadening is performed in the undesired direction, and distortion does not appear in the desired direction. With the method adopted, the problem of the decrease of interference suppression capability in the case of small null width under a user mobile condition can be solved, the robustness of a system is improved, and therefore, the interference of position change can be effectively suppressed, and desired signals can be nearly distortion-free, spectral efficiency is effectively increased, and a requirement for higher rates can be satisfied.

A time modulation array based communication and radar integrated design method is provided. The invention relates to a communication and radar integrated design method. The invention solves the problem that the existing integrated waveform design methods have high complexity, the time division based integrated methods are low in efficiency, the reliability of the space division based integrated methods are low, and scanning detection cannot be performed. The invention comprises: 1, calculating and obtaining an amplitude of a nth array element weighted value; 2, periodically modulating a uniform linear array, and obtaining an array factor of a fundamental component of a time modulation array and an array factor of the time modulation array +a first harmonic component; 3, calculating a phaseof the nth array element weighted value; 4, calculating the turn-on time and the turn-off time of each array element RF switch; and 5, mixing and sending a radar signal and a communication signal tothe time modulation array in the transmit mode; simultaneously receiving the radar signal and the communication signal in the receiving mode, and using a band pass filter to perform distinguishing. The invention is used in the field of communication and radar integration.

A multiple antenna beam steering device includes three-element array, which are controlled to increase power reception in the direction of the desired signal while simultaneously minimizing signal reception in one or more directions of interference, using selective weighting of received signals, and specified summation stages to produce combined array factors that are used to form a beam pattern that is both maximized in at least one signal direction and minimized in at least one interference direction.

The present invention discloses a three-dimensional base line integration aperture imaging method based on array factor integration. The method comprises: calculating a base line vector coordinate sequence and removing redundant base lines wherein to form integrated aperture array non-redundancy uvw distribution; filling a visibility function corresponding to non-redundancy uvw according to the multiple correlation output through system output, obtaining a non-redundancy visibility function vector, and performing discretization of scene brightness temperature distribution; establishing an integration aperture forward model according to the redundancy average visibility function, the non-redundancy uvw distribution, the scene discretization distribution and an extinction fringe function, and establishing an optimal weight solution model according to the inversion image noise minimization and the array directional diagram major lobe pointing observation direction; and traversing object scene observation points, calculating the brightness temperature of each observation point according to an optimal weight, and obtaining an inversion image. Compared to a traditional inversion method based on a G matrix, the three-dimensional base line integration aperture imaging method based on array factor integration is equivalent in prevision, but is better in inversion efficiency and storage space occupation.

The invention discloses an irregular antenna array sub-array distribution optimization method based on sub-array factor gain maximization. According to the method, an irregular antenna array directional diagram calculation formula is decomposed into a product of a sub-array factor and a sub-array directional diagram, and the sub-array factor plays a decisive role in the radiation performance of an irregular antenna array, so that the maximum sub-array factor gain is firstly established, meanwhile, the integer optimization problem that the antenna array surface is accurately and completely divided is met, and an optimal array topological structure of the irregular antenna array by utilizing an integer optimization solver is solved; and then, according to the optimized array topological structure, a convex optimization problem which takes beam width and peak side lobe level as constraint conditions, takes maximized irregular antenna array gain as a target function and takes sub-array level amplitude-phase excitation as an optimization variable is established, and an efficient solution is solved by using a convex optimization algorithm to avoid direct solving of a complex mixed integer optimization problem.

The invention discloses an array factor molding method of a synthesis aperture microwave radiometer. The array factor molding method comprises the steps of calculating the positions of sampling points in a space frequency domain corresponding to an antenna unit according to the position coordinates of the antenna unit; multiplying each sampling point by a coefficient corresponding to the sampling point to obtain amended array factors, selecting a desired array factor, and calculating the error function of the amended array factors and the desired array factor; calculating a coefficient under the condition of enabling the norm or mean square error of the error function to be minimal; multiplying the calculated coefficient by the corresponding sampling points to obtain amended array factors. Each amended array factor has a smaller sidelobe or narrower main wave beam, and the inversion precision of a non-uniform sampling synthesis aperture radiometer is improved; the array factor molding method is suitable for both the non-uniformity sampling synthesis aperture radiometer and a uniform sampling synthesis aperture radiometer, and has a better effect for improving the inversion precision and the space resolution of the synthesis aperture radiometers.

The invention discloses an arbitrary mode eddy electromagnetic wave generation method based on a time modulation array, which mainly solves the problem that the prior art cannot generate fractional eddy electromagnetic waves in a radio frequency band and the beam alignment cost is high. A scheme for realizing the method comprises the steps of arranging a plurality of antenna elements into a circlewith equal spacing and connecting a radio frequency switch to each antenna element; calculating the array factors of the circular antenna array and expanding to extract the array factor of the mth harmonic; setting the desired direction of transmission and the desired mode to be generated in order to find the equation relationship between the amplitude part and the phase part found out from the mth harmonic array factor to calculate the gain of each antenna, the opening and closing time of the radio frequency switch, and then loading these parameters on the radio frequency switch of the corresponding antenna unit in the form of periodic square wave signal to generate the eddy electromagnetic wave. The invention can generate integer-order and fractional-order arbitrary mode eddy electromagnetic waves, has low beam alignment cost, and can be used for wireless communication and radar imaging.

The invention discloses a self-adaptive radiation unit with multiple phase centers and an array antenna. The self-adaptive radiation unit comprises a dielectric substrate and two rectangular metal patches of a lower surface metal layer and an upper surface printing circuit, wherein the two rectangular metal patches are connected with the lower surface metal layer via grounding metal through holesand are connected with a feeding port, the feeding port is connected with a phase shifter, the self-adaptive radiation unit is provided with multiple phase centers, a feeding phase of each phase center is variable, and a radiation direction diagram of the self-adaptive radiation unit is changed by changing a phase relation among the phase centers. A plurality of self-adaptive radiation units of the array antenna are connected, adjacent ports of adjacent self-adaptive radiation units share the phase shifter, the pointing direction of a unit directional diagram points is automatically deflectedwith an array factor, and the deflection of a unit wave beam with an array scanning angle and large-angle scanning of the array are achieved under the condition that the number of the phase shifters of a traditional array antenna is not increased and the complexity of a feeding is not improved.

The invention belongs to the technical field of antenna array pattern synthesis, and particularly relates to an array pattern synthesis method based on a non-uniform fast Fourier transform algorithm.The method comprises the steps of setting an antenna array with a certain array element number, wherein the uniform linear array has an array element interval of d; initializing parameters: setting apeak sidelobe level value, randomly initializing array element excitation, and setting the maximum number of iterations; calculating an interpolation coefficient x(cm) and a matrix W; calculating thevalue of the vector T according to T = WA; performing K-point IFFT on the vector T; modifying the array factor after the IFFT operation; carrying out fast Fourier transform on the modified array factor, intercepting the first L points, and obtaining the modified array element excitation T again; and finally, according to the formula (shown in the specification), converting the matrix into an excitation value A corresponding to each real array element. According to the method, fast Fourier transform is adopted for calculation of each pattern, so that the operation efficiency is high, and the processing speed is high under the condition of complex data; the method can be used for synthesizing the uniform array and the non-uniform array pattern at the same time, and the application range is wide.

The invention belongs to the category of array signal processing of antennas receiving wireless transmission signals, discloses a method for obtaining the array antenna receiving signal power range, and particularly relates to a method for calculating the power error generated when an antenna receives signals when array errors exist. The method comprises the steps that according to measured array receiving signal amplitude errors and array element position errors, an array factor model is determined, the array factor model is made to deform to obtain a real part and an imaginary part, and then the upper and lower bounds of the array receiving signal amplitude and phase part errors are obtained, so that the upper and lower bounds of the array factor real and imaginary parts are obtained, and finally the upper and lower bounds of the signal power errors are obtained through calculation. Accordingly, the obtained antenna receiving signal power errors are more accurate, and major parameters such as the minor lobe level, the main lobe width and the array direction coefficient can be effectively controlled in the antenna design.

The invention relates to a method for implementing a light pipe field array having predetermined characteristic. According to the method, a hollow light pipe array is achieved by reversely rotating aradiation field of an isotropic collinear magnetic current antenna array arranged at a focus region. A simulation example shows that the implemented hollow light pipe is in pure azimuthal polarization, the light intensity distribution within the whole focal depth range is hardly maintained unchanged, and the shape and the position of the hollow light pipe are respectively dependent on an element factor and an array factor. The light pipe array having predetermined property, implemented by the method, can be expected to be used for the fields of multi-particle capturing and control, multi-particle processing and photoetching and the like.

The invention provides a linearization method for reducing the number of design parameters in an antenna array synthesis problem. The method comprises the following steps of converting an amplitude-phase form of the port excitation design parameters of an antenna array into a real part-imaginary part form; establishing a nonlinear equation set of the antenna array according to an expected array factor in a real part-imaginary part form of the antenna array in a certain direction in combination with the actual array factor in the certain direction; setting a parameter vector to equivalently process the nonlinear equation set of the antenna array to obtain a linear equation set of the antenna array about the parameter vector and the port excitation design parameter; solving the port excitation design parameter meeting the design requirement of the antenna array according to the design requirement of the antenna array. The method has the beneficial effects that the complexity of the antenna array synthesis problem is reduced, the number of the design parameters of the port excitation parameters related to the antenna array scale is reduced, the calculation cost is further reduced, andthe design efficiency of the antenna array is improved.

The invention discloses a stealth metasurface radar scattering cross section reduction method based on spatial mapping. The stealth metasurface radar scattering cross section reduction method includes the steps: firstly, establishing a stealth metasurface model, enabling uniform plane waves to be irradiated to the stealth metasurface, and determining the total scattering field of the stealth metasurface; secondly, calculating the RCS of the stealth metasurface obtained in the first step according to an array factor considering coupling, taking the RCS as a coarse model of a stealth metasurface SM algorithm, optimizing the coarse model and finding out an optimal solution of the coarse model; and finally, obtaining prediction parameters of the fine model by using the optimal solution of the coarse model and the mapping relationship established in the step 3, judging whether the obtained response meets the optimization design requirement or not, and if not, performing iterative updating on the mapping relationship between the established coarse model parameters and the established fine model parameters until the obtained response meets the design requirement. According to the stealth metasurface radar scattering cross section reduction method, the arrangement mode of the two units forming the super surface is optimized, and under the condition that the size of the array surface of the super surface is determined, and the RCS reduction amount is increased, and meanwhile time and internal storage are saved.

The invention belongs to the technical field of a broad-angle scanning phased-array antenna, and discloses a broad-angle scanning phased-array antenna adopting a special directional diagram array element, and a design method. A low-profile phased array adopts sub arrays with special directional diagrams as the array element to enable a low-profile phased-array antenna to realize stable gain withina broad scanning angle range or to satisfy the requirement of higher gain with a large scanning angle; the maximum gain directions of the special directional diagram are symmetrically distributed between the normal direction of the array plane and the maximum scanning angle direction close to the maximum scanning angle direction so as to form the characteristic of a concave center of the directional diagram; the central concave depth of the array element directional diagram is designed according to the array group requirement; and the array factor directivity is stronger, the central concaveis deeper. Stable gain of the low-profile phased-array antenna in the broad scanning angel range can be realized or the requirement of higher gain with a large scanning angle can be satisfied under the premise of not changing the phased array factors.

The invention discloses a multi-sub-array antenna beam switching method based on maximization of power of a receiving signal. The method comprises the following steps of 1, establishing an array factor directional diagram model of a multi-sub-array phased array antenna; 2, acquiring strength g (0, 0, alpha, f1) of the receiving signal of an array factor directional diagram of the sub-array phased array antennas in a target satellite direction, and then computing power of the receiving signal of the array factor; 3, establishing an optimization model maxS by taking the maximal power P (alpha, f1, L) of the receiving signal after compensation of a delay line as a target and using the length of each sub-array delay line as a variable, and thus acquiring the length Lq of each sub-array delay line and a corresponding elevation angle beta aiming a satellite when compensation is performed by the delay line; and 4, computing a value of an elevation angle [alpha]n of each partition node, and then implementing multi-sub-array antenna beam switching according to the length Lq of each sub-array delay line, the corresponding elevation angle beta aiming the satellite when compensation is performed by the delay line and the value of the elevation angle [alpha]n of the partition node. According to the method of the invention, a delay error is compensated by the delay line, occurrence of the problem that the power of the receiving signal of the antenna is reduced caused by frequency variation is inhibited, and the cost is low.

The invention provides an antenna array sparse cloth optimization method, device and equipment and a readable storage medium, the antenna array sparse cloth optimization method comprises the following steps: S1, initializing antenna array parameters; s2, generating an antenna array initial population; s3, genetic algorithm circulation; s4, retaining the optimal individual in the new population; s5, storing the optimal antenna distribution position; s6, array factors after large-scale array sparse position optimization are calculated according to the optimal result, and the sparse / sparse cloth optimization method suitable for the large-scale antenna array is provided so that the number of channels can be reduced, and hardware cost can be reduced.

The invention discloses a bidirectional beam forming method based on a time modulation linear array. The method comprises the following steps: constructing an array factor of a time modulation lineararray capable of forming a bidirectional beam; calculating the switching time of each array element in the time modulation linear array according to the required sidelobe, beam pointing and null direction; carrying out modulation by switching time to form a bidirectional wave beam. According to a traditional beam forming method of a time modulation linear array, a single sequence is adopted for successive scanning, and the mode is low in efficiency and can only control a single beam. Based on time sequence offset, a plurality of sequences are adopted for simultaneous scanning, so that bidirectional +1 harmonic waves are generated, a hardware structure does not need to be improved, and the available harmonic wave direction is increased while the cost is saved. In addition, fundamental wavesare added, beams in three directions can be generated at most, and the purpose of efficient and low-cost multi-beam forming is achieved.

According to a flatness optimization method for the sum-difference beam signal level of a phased-array antenna provided by the invention, the consumed hardware resources are small, and the beam formation of the multi-beam phased-array antenna can be improved. The method is realized through the following technical scheme: realizing peak sidelobe level optimization of a linear sparse array based on an iterative FFT algorithm; respectively carrying out iterative circulation on different initial random array element excitations by utilizing a Fourier transform pair relation between an excitation array factor and array element excitations in an activation region of the phased-array antenna to obtain optimal array element distribution; obtaining an array element excitation coefficient in a loop iteration mode, calculating sum and difference beam weighting coefficients of each array element or sub-array, completing sum and difference beam level smooth sliding design of the phased-array antenna during self-tracking of a space target according to an automatically generated excitation signal, and based on the sum and difference beam level smooth sliding design, obtaining the corrected sum and difference beam levels by using the difference array division characteristic of the multi-beam forming spherical array antenna.

According to the phase control array antenna sidelobe quick calculation method and the sidelobe reduction method, the power directional diagram of the phase control array antenna is obtained based on the array factor of the phase control array antenna; deriving a power pattern of the phased array antenna to obtain a difference value between any point in the power pattern and a peak value closest to a reference point, and taking the difference value as a minor lobe accurate position of the phased array antenna; and substituting the side lobe position of the phased array antenna into the array factor of the phased array antenna, and calculating to obtain the side lobe size of the phased array antenna. Array synthesis can be performed on any one-dimensional and two-dimensional distributed phased antennas in combination with a genetic algorithm, quick amplitude reduction of the minor lobes of the phased array antennas is realized, the calculation time is short, and the algorithm efficiency is high.

The present invention relates to a method for identifying components in a telecommunication system, which method comprises the steps representing a uniform linear array, ULA, antenna (5), having at least two antenna elements, by an array factor polynomial comprising at least two terms, each term having a certain weight (wK); setting said weights (wK) to desired values such that a desired antenna radiation pattern is acquired. Furthermore, the method comprises the steps: changing the desired weights such that a number of sets of desired weights (wK) is acquired, such that the ULA antenna (5) scans a spatial portion, a certain scan corresponding to a certain set of desired weights, analyzing a received signal (h0) being represented by a received array factor polynomial having terms with certain received weights, which is parameterized by at least one pole; and using each corresponding set of desired weights (wK) and received weights to determine the pole parameterization.

The invention discloses an optimization method and system for an ultra-wideband RCS reduced metasurface array and a medium. The method comprises the steps of determining RCS phases and amplitudes of diffuse reflection structure units with different heights and different square ring side length combinations; rCS of different initial arrays is calculated through array factors, a metasurface array containing a multi-element subarray is optimized through a genetic algorithm, further optimization is carried out through verification of a space mapping algorithm and a full-wave analysis method, and rapid design of the ultra-wideband radar scattering cross section reduction metasurface is achieved. Compared with a traditional metasurface algorithm optimization design method, the method not only considers the influence of subarray coupling, but also greatly shortens the verification time of electromagnetic simulation software, has the advantages of being simple in programming and high in calculation efficiency, and has high practical value.

The invention relates to a vector near-field light modulation device and method based on an annular particle array, which are characterized in that each particle in the array can be equivalent to an electric dipole by utilizing the periodically arranged particle array under the excitation of a vector light field with the same symmetry. Based on a classical electromagnetic theory, an array factor corresponding to a circular ring array is constructed, so that polarization of each particle is associated with an incident light field. On the basis, the near field of any array can be accurately calculated. Near-field distribution behind the array can be generated and modulated by changing the parameters of the array structure and the particles and the parameters of the excitation field.

The invention discloses a self-adaptive radiation unit with multiple phase centers and an array antenna. The self-adaptive radiation unit comprises a dielectric substrate and two rectangular metal patches of a lower surface metal layer and an upper surface printing circuit, wherein the two rectangular metal patches are connected with the lower surface metal layer via grounding metal through holesand are connected with a feeding port, the feeding port is connected with a phase shifter, the self-adaptive radiation unit is provided with multiple phase centers, a feeding phase of each phase center is variable, and a radiation direction diagram of the self-adaptive radiation unit is changed by changing a phase relation among the phase centers. A plurality of self-adaptive radiation units of the array antenna are connected, adjacent ports of adjacent self-adaptive radiation units share the phase shifter, the pointing direction of a unit directional diagram points is automatically deflectedwith an array factor, and the deflection of a unit wave beam with an array scanning angle and large-angle scanning of the array are achieved under the condition that the number of the phase shifters of a traditional array antenna is not increased and the complexity of a feeding is not improved.

The present invention discloses a moving target DOA (direction of arrival)-based null broadening 3D-MIMO beamforming method and belongs to the interference suppression field. The method includes the following steps that: on the basis of existing 3D-MIMO beamforming, an antenna array of M*N array elements is constructed on an xy plane for a base station and a certain mobile terminal which communicates with each other; the weight of each of array factors is calculated; DOA information between a target mobile terminal and the base station as well as between an interference mobile terminal and the base station is determined; the weight of each array factor is re-adjusted according to the DOA information; and constraint is applied to angle regions around a desired direction and an undesired direction, null broadening is performed in the undesired direction, and distortion does not appear in the desired direction. With the method adopted, the problem of the decrease of interference suppression capability in the case of small null width under a user mobile condition can be solved, the robustness of a system is improved, and therefore, the interference of position change can be effectively suppressed, and desired signals can be nearly distortion-free, spectral efficiency is effectively increased, and a requirement for higher rates can be satisfied.