12 results about "Amplitude weighting" patented technology

The invention relates to the technical field of wireless communication and sensing, and particularly discloses a holographic amplitude weighting-based two-dimensional antenna array multi-beam scanning method, which comprises the following steps of: determining the position information of each radiation unit in a two-dimensional antenna array, including calculating the interval and the arrangement mode of the units; an amplitude weighted value of each radiation unit is generated according to the target wave direction, a two-dimensional multi-beam holographic amplitude weighting technology is used, and the radiation unit amplitude weighted values are determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating a corresponding binary discretization coding sequence based on the amplitude weighted value so as to control the excitation amplitude of each radiation unit; and designing a liquid crystal-based Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array, and regulating and controlling a radiation pattern of a two-dimensional antenna array through the coding sequence to realize multi-beam scanning.

The application relates to the field of wireless communication and sensing technology, and particularly discloses a two-dimensional antenna array multi-beam scanning method based on holographic amplitude weighting, which comprises the following steps: determining the position information of each radiation unit in the two-dimensional antenna array, including calculating the unit spacing and arrangement mode; generating the amplitude weighting value of each radiation unit according to the target wave direction; using the two-dimensional multi-beam holographic amplitude weighting technology, the amplitude weighting value of the radiation unit is determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating the corresponding binary discretization coding sequence based on the amplitude weighting value to control the excitation amplitude of each radiation unit; designing a Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array based on liquid crystals, and the radiation pattern of the two-dimensional antenna array is regulated and controlled through the coding sequence to realize multi-beam scanning.

An apparatus and method of rendering audio. A binaural signal is split on an amplitude weighting basis into a front binaural signal and a rear binaural signal, based on perceived position information of the audio. In this manner, the front-back differentiation of the binaural signal is improved.

The application discloses a dual-frequency microstrip antenna array with different feeding modes and relates to the technical field of antennas. The dual-frequency microstrip antenna array comprises N*N antenna array elements, each of the antenna array elements comprises four antenna units, the four antenna units are arranged in a 2*2 matrix form, and the four antenna units are fed in the same direction; in any four adjacent antenna array elements arranged in the 2*2 matrix form, the horizontal feeding directions of two adjacent antenna array elements in the vertical direction are the same, and the vertical feeding directions are opposite; the horizontal feeding directions of two adjacent antenna array elements in the horizontal direction are opposite, and the vertical feeding directions are the same. The antenna array is divided into four kinds of antenna array elements, and different feeding is conducted, so that cross polarization is greatly improved. Meanwhile, the reverse sparse array and the reverse amplitude weighting technology are adopted, so that the sidelobe of the gain pattern of the antenna is uniform, and the optimization of cross polarization and gain is realized.

The invention particularly relates to a sparse array DOA (direction of arrival) estimation method based on an optimized array manifold dictionary, and the method comprises the steps: firstly carrying out the layout optimization of an initial uniform area array through combining a genetic algorithm, constructing an eight-element sparse array structure, and maintaining a directional diagram which is close to a full array while greatly reducing the number of array elements; performing energy screening on multichannel observation signals acquired by the sparse array, and extracting a dominant frequency band to improve an effective signal-to-noise ratio; and an optimized array manifold dictionary is constructed based on a phase compensation mechanism and an amplitude weighting mechanism, and the internal correlation of the dictionary is reduced by minimizing off-diagonal elements of a dictionary Gramer matrix. And on the basis, sparse reconstruction is carried out on the optimized dictionary by using an orthogonal matching pursuit algorithm, so that a direction-of-arrival estimation result of the sound source signal is obtained. According to the scheme, inherent direction finding fuzziness and grating lobes of the sparse array are effectively suppressed, the direction estimation precision is improved, and high reliability and high robustness are still kept under the condition that the number of array elements is remarkably reduced.

The application relates to a multi-beam forming method and device based on a digital multi-channel cylindrical array, which comprises the following steps: acquiring the azimuth angle, frequency and transceiving mode of a desired beam; calculating the channel number closest to the azimuth angle of the desired beam according to a channel division and numbering rule of the cylindrical array; dynamically dividing a plurality of beam subarrays so that the desired beam is directed to the center of the subarray; mapping the dynamic subarray of the plurality of beams to a corresponding channel enabling table; performing amplitude weighting on the subarray, mapping the amplitude weighting value of the subarray to the corresponding channel of the dynamic subarray, and combining the channel enabling table to obtain an amplitude weighting table of the full array of each beam; calculating the weight coefficient of each channel according to the amplitude weighting table, the amplitude phase compensation value and the frequency; and realizing the above steps through a Vitis HLS tool to generate an IP core and performing digital multi-beam forming in an FPGA. The application guarantees good beam forming performance and can simultaneously form a plurality of transmitting beams or receiving beams in all directions.

The application discloses an imaging method, device, equipment, medium and product of seismic waves. The method comprises the following steps: acquiring seismic data of a region to be imaged; performing amplitude compensation and Laplace filtering on an original reverse-time migration result to obtain a first target result; calculating a three-dimensional reflection coefficient of an original FWI velocity model and performing dip filtering to obtain a second target result; calculating a phase shift operator and an amplitude weighting coefficient according to the target results, and performing weighted processing on the target results to obtain a target imaging result corresponding to the region to be imaged. The original reverse-time migration result and the FWI calculation result are optimized and then weighted and superimposed, the energy of low wave numbers and high wave numbers in the seismic waves is enhanced, the frequency band range of conventional migration is expanded, the imaging result is more stereoscopic, the boundary line and the interface horizon change can be displayed, the full-bandwidth seismic data is mapped into a high-resolution seismic profile in the depth domain in the time domain, and the quality of the seismic wave imaging is improved.

The invention discloses a millimeter wave imaging scanning detection method and system based on a lens antenna, and relates to the field of object scanning detection, and the method comprises the steps: S1, configuring the hardware structure data of a lens antenna array; s2, controlling the lens antenna array to execute micro displacement to perform preliminary scanning; s3, obtaining target priority areas, and setting a local scanning path of each target priority area; s4, carrying out local scanning; and S5, executing an imaging output path based on an image data quality evaluation result. According to the invention, the target priority area is identified through linear micro-displacement scanning controlled by the central control unit. According to the method, local high-precision scanning is carried out on a target priority area, precise focusing of a beam main lobe is realized by adjusting the phase delay and the amplitude weight of a lens antenna sub-array, and the image acquisition quality is improved. Based on an image data quality evaluation result, a scanning path and beam parameters are dynamically optimized, the imaging precision is ensured, and a high-quality comprehensive image is output through a fusion weighting mechanism of a receiving channel.

The invention relates to a W-band low-sidelobe slot waveguide array antenna, and the antenna comprises a metal waveguide housing which is internally provided with a waveguide channel; the radiation slot array comprises a plurality of radiation slots formed in the wide wall surface of the metal waveguide shell, the plurality of radiation slots are arranged in a two-dimensional array, and the excitation amplitude of each radiation slot is determined by a two-dimensional Taylor distribution weighting coefficient; the hierarchical power division feed network comprises multi-stage power dividers which are branched stage by stage, the power division ratio of each stage of power divider is determined by a two-dimensional Taylor distribution weighting coefficient, each stage of power divider generates an inherent phase difference under the condition of unequal power division ratios, and the power division ratios, the geometric parameters of a bifurcation region and the length of a phase compensation section meet a constraint relation. The sum of the inherent phase difference and the compensation phase difference compensates for the path phase difference between the two output branches. Amplitude weighting and phase compensation are jointly achieved in the same power divider structure, the number of independent compensation sections is reduced, the total path of a feed network is shortened, and W-waveband transmission loss is reduced.

The application provides an ultra-wideband impulse SAR standing wave suppression method and device, relates to the field of radars, and comprises the following steps: obtaining echo data through ultra-wideband impulse SAR scanning and performing data preprocessing; performing two-dimensional SAR imaging by using the preprocessed echo data to obtain a two-dimensional SAR image with a standing wave; selecting a mismatch frequency range according to a standing wave signal frequency model and actual antenna parameters, and removing in the distance spectrum of the two-dimensional SAR image; extrapolating the removed frequency components by using an energy-weighted least square method to obtain a complete distance spectrum; and transforming the obtained distance spectrum back to an image domain after a certain amplitude weighting to obtain a two-dimensional SAR image after standing wave suppression. The application discards mismatch frequency components in the distance spectrum of the two-dimensional SAR image, realizes the suppression of mismatch signal components, and solves the spectrum leakage and distance resolution loss caused by the removal of the frequency components through spectrum extrapolation.

The invention provides a substrate integrated dielectric resonator antenna array with multiple sidelobe suppression schemes, relates to the technical field of antenna wireless communication, and solves the technical problems that in the prior art, the application sidelobe suppression capability of a high-order mode technology is insufficient and incomplete, and an amplitude weighting or spacing optimization method is limited. According to the technical scheme, the method comprises the following steps of: accurately designing a unit interval to align an array factor grating lobe with a zero point of a unit directional diagram; the distance between the two gaps is regulated and controlled to control the zero point position of a unit directional diagram, and the radiation zero point depth is deepened by using a substrate integrated structure; amplitude weighting fed to each port is realized through thickness difference and position offset of impedance conversion lines of different ports of the feed network, and the sidelobe level of the array is inhibited; the triangular grooving structure improves the flexibility of impedance matching adjustment and port amplitude weighting. Cooperative sidelobe suppression is achieved, integrated manufacturing is achieved through the substrate integrated structure, and the overall performance and reliability of the array are remarkably improved while high gain is kept.

The invention provides an ultra wide band impulse SAR standing wave suppression method and device, and relates to the radar field, and the method comprises the steps: obtaining echo data through ultra wide band impulse SAR scanning, and carrying out the data preprocessing; performing two-dimensional SAR imaging by using the preprocessed echo data to obtain a two-dimensional SAR image with standing waves; selecting a mismatching frequency range according to a standing wave signal frequency model and actual parameters of an antenna, and removing the mismatching frequency range in a distance spectrum of the two-dimensional SAR image; extrapolating the removed frequency components by using an energy weighted least square method to obtain a complete distance spectrum; and performing certain amplitude weighting on the distance spectrum obtained by extrapolation, and then transforming the distance spectrum back to an image domain to obtain a two-dimensional SAR image after standing wave suppression. According to the method, the mismatched frequency component is abandoned in the distance spectrum of the two-dimensional SAR image, so that the suppression of the mismatched signal component is realized, and the spectrum leakage and distance resolution loss caused by removing the frequency component are solved through spectrum extrapolation.