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.

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.

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 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 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 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 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 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 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.