52 results about "Pattern synthesis" patented technology

The invention discloses a side-lobe suppression method for a three-dimensional array antenna pattern based on an improved MOPSO and a convex optimization algorithm. Firstly, three-dimensional array antenna pattern synthesis is modeled and analyzed, and a basic mathematic model of the array antenna radiation pattern synthesis is given, and multi-objective functions of low side-lobe pattern synthesis under constraint conditions of an array radiation direction and first side-lobe suppression are constructed respectively; then, the maximal excitation of a polarization directivity coefficient is obtained by a Lagrange multiplier method and is added in the MOPSO algorithm as preference information, an initial population is generated in the vicinity of optimal solutions, and the model is solved by iterative calculation; a convex optimization model of the low side-lobe pattern synthesis is constructed, a convex optimization tool is utilized to solve the corresponding optimal solutions under different threshold constraints, then the three-dimensional array antenna pattern under the low side-lobe constraint is obtained, and therefore the purpose of side-lobe suppression is achieved. According to the side-lobe suppression method for the three-dimensional array antenna pattern based on the improved MOPSO and the convex optimization algorithm, the optimization performance of the algorithms is improved, and the side-lobe suppression problem of the three-dimensional array antenna pattern can be solved efficiently and quickly.

A moving radar generates a search mode synthetic aperture image of a patch from periodic pulse returns reflected from the patch. The patch is imaged from radar returns derived from two or more overlapping arrays. A strong scatterer is located within each array, then the data from each array is motion compensated with respect to the motion of the radar and the strong scatterer. The motion compensated results for each array are autofocused to derive a phase error for each array. Using the phase error for each array, a connected phase error estimate is computed, added to the phase error of each array to minimize the differences between phases in the overlap between arrays insuring that there is no or minimal phase discontinuity in the overlap region between arrays. Avoiding phase discontinuity yields a clear SAR image of the combination of arrays rendering the patch.

The invention discloses a synthesis method of an array antenna shaped beam with a controllable excitation amplitude dynamic range, and relates to array antennae. The method comprises the following steps: expressing an array antenna shaped power pattern synthesis problem with the controllable excitation amplitude dynamic range into a mathematical model; introducing an auxiliary variable zeta, performing equality conversion on the constraint of an array excitation amplitude dynamic range ratio, so as to ensure that the constraint of the array excitation amplitude dynamic range ratio is equivalent to the constraint of a square mode on each array element excitation; respectively converting power constraint conditions of a main lobe and a side lobe of a shaped beam into the mode of a trace of a matrix Tr (.), and meanwhile further expressing the DRR constraint of the array element excitation into a constraint mode of a trace of a matrix. As the synthesis problem belongs to a typical nonlinear and nonconvex problem, certain nonconvex constraints are loosened, and meanwhile the looseness is controlled through certain other measures, the nonconvex problem is converted into a convex problem, further a characteristic value decomposition method can be utilized for solving, and finally excitation amplitude distribution meeting requirements is finally obtained.

A haptic feedback apparatus using a vibration atmosphere compensation algorithm may include: a vibration sensor configured to collect vibration atmosphere data; a memory configured to store a pattern for compensating for the vibration atmosphere and a haptic pattern corresponding to a touch input; a controller configured to generate a pattern for compensating for the vibration atmosphere based on the vibration atmosphere data, synthesize the haptic pattern stored in the memory with a pattern for compensating for the vibration atmosphere, when a touch input of the user is detected through a touch panel, and output the synthesized haptic pattern; and an actuator configured to vibrate according to the haptic pattern outputted from the controller.

The invention discloses a conformal phased array antenna pattern synthesis method applied to an unmanned aerial vehicle. The conformal phased array antenna pattern synthesis method comprises the following steps of: acquiring a general pattern of conformal phased array antennas, and acquiring an initial optimization value of the amplitude Amn of each antenna unit; optimizing the initial value of the Amn by virtue of a genetic algorithm; and acquiring a conformal phased array antenna pattern with a low side lobe characteristic. According to the invention, a plane phased array optimization method is used for quickly obtaining the amplitude of each unit and the approximate value of each phase; and as a side lobe hunting zone is reduced by designating side lobe areas, the optimization speed ofthe genetic algorithm is improved greatly. The method disclosed by the invention also can be applied to the low side lobe pattern synthesis of any conformal phased array of the antenna units projected on a plane.

A semiconductor test system includes a user device configured to operate a reference device in accordance with an interface signal based on a timing signal having a variable operating frequency, a pattern synthesis apparatus configured to measure an interval between adjacent edges of the timing signal transmitted from the user device, and extract a logic value of the interface signal in accordance with the timing signal so as to generate test pattern data, and a test device configured to receive the test pattern data, reconstruct the timing signal based on the measured interval, generate a test driving signal such that the logic value is extracted from a device under test (DUT) based on the reconstructed timing signal, and apply the test driving signal to the DUT so as to determine an operating state of the DUT.

The invention discloses a planar array antenna pattern synthesis method based on sub arrays. A hybrid optimization algorithm combining an improved iterative Fourier transform method (IFT) and multiple intelligent optimization algorithms is adopted to perform pattern synthesis design on a sub array planar array antenna, a sub array optimization variable construction method is adopted in the design process, and the synthesis design is concise. The synthesis method further takes an influence of a mutual coupling factor between antenna units into account, and an optimization result is accurate. The method aims at a synthesis design problem of the sub array form planar array antenna, and has the advantages of high calculation efficiency and good universality.

A radar tracking method and system is disclosed that improves radar resource utilization and increases Doppler resolution. The method includes tracking a primary target and a secondary target by directing a radar transmit signal main lobe at a primary target, the radar transmit signal main lobe having associated radar transmit signal side lobes, and receiving a main lobe radar return signal and side lobe radar return signals. A secondary target proximate to a first side lobe radar transmit signal is identified. Then, the primary target is tracked using the radar transmit signal main lobe and the main lobe radar return signal, and the secondary target is tracked using the first side lobe radar transmit signal proximate the secondary target and an independent side lobe return beam formed to align with the secondary target.

The invention provides a sparse antenna pattern synthesis method based on an ant lion algorithm, which is mainly used for solving the problems that the prior art is prone to trap into local optimization in the process of side lobe suppression of the sparse antenna, and overly relies on an initial solution, so as to reduce the side lobe suppression ability of the sparse antenna. The initializing population is divided into an elite ant lion, ant lion populations and ant populations according to the fitness value, At the same time, the elite ant lion, ant lion population and ant population are optimized by multiple alternating projection mechanism, differential evolution mechanism and stochastic optimization, which have the ability of global searching and fast convergence, so that the sidelobe and main lobe width suppression performance of the sparse antenna can be improved maximally under the condition of a small number of iterations.

The invention provides a synthesis method of a hand painted pattern, relating to a pattern synthesis technology and providing a synthesis method of a hand painted pattern according to human vision mechanism features. The synthesis method comprises the following steps of: painting a pattern sample by using a digitizer; inputting the size of a synthesis pattern; clustering pattern elements in the pattern sample, and classifying each pattern element in the pattern sample into an element category; analyzing distribution features of the pattern elements; placing seed points to generate a seed drawings; constructing a mapping relation; mapping each seed point to one element category; and displacing each seed point into one pattern element to synthesize the pattern. The synthesis method can obtain the large-scale synthesis pattern similar to the pattern sample on the visual perception and overcomes the defects of the hand painted pattern. Compared with the pure hand painting method, the synthesis method can greatly improve the painting efficiency. The synthesized pattern has not periodic repeat on the structure. Compared with the traditional square continuous method, the synthesis effect is more vivid. Compared with a texture synthesis method, the synthesized pattern is more accordant with the human vision cognition low.

The invention provides a convex optimization-based near-field array antenna pattern synthesis method. The method comprises the following steps of: 1, determining a shape of a main lobe, a position range in which minor lobe control needs to be carried out, and a peak minor lobe level; 2, establishing a radiation model of a radiation near-field region on the basis of a point focusing antenna array;and 3, establishing a convex optimization model and solving motivation of the antenna array. The method has the advantages of generating radiation near-field regions into patterns with any shape and controllable minor lobes and being high in calculation speed, and can be used for optimum design of near-field planar array antennas.

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 embodiment of the invention discloses a method for suppressing distance ambiguity based on antenna pattern synthesis. The method comprises the steps of obtaining a target wave position working instruction; determining a target wave position signal parameter according to the target wave position working instruction; initializing measurement parameters which comprise the target wave position signal parameter, an SAR system parameter and a user-defined parameter; determining a signal emission weight corresponding to the target wave position signal according to the measurement parameter; determining a signal correlation matrix and a range ambiguity correlation matrix of the target wave position signal according to the signal emission weight and the measurement parameters; determining an initial array weight according to the signal correlation matrix and the distance ambiguity correlation matrix; determining a convex optimization problem according to the target wave position working instruction; and determining a receiving weight corresponding to the target wave position signal according to the initial array weight and the convex optimization problem. The embodiment of the invention also discloses a device for suppressing distance ambiguity based on antenna pattern synthesis.

The invention relates to an OSD pattern generation device which comprises: an analog-digital converter for converting CVBS image signals in the analog form to the CVBS image signals in the digital form; a synchronous signal separation module for separating synchronous signals from the CVBS image signals in the digital form; an OSD generation module for generating OSD pattern signals; a signal modulation module for modulating the OSD pattern signals to the OSD pattern signals which are synchronous with the image signals and have the CVBS format according to the synchronous signals; and a pattern synthesis module for overlapping the CVBS image signals in the digital form and the OSD pattern signals in the CVBS format. The OSD pattern generation device of the invention has the advantages of low cost.

The invention discloses an array pattern synthesis method based on a hybrid differential evolution algorithm and a weighted total least square method. The array pattern synthesis method comprises thefollowing steps: step 1, setting target parameters of the hybrid differential evolution algorithm and the weighted total least square method; 2, writing the comprehensive problem of the array directional diagram into a formula [A] [I] = [S], and adding a diagonal matrix X to control the weights of different angle differences of the directional diagram; 3, calculating to obtain an array element current I in the array by using a total least square method, and substituting the array element current I into a radiation pattern formula to obtain a preliminary radiation pattern; 4, updating and optimizing the weight matrix X by using a differential evolution algorithm; 5, calculating a fitness function value of the array antenna population through a fitness function; 6, judging whether the fitness function value is smaller than a certain value epsilon or reaches the maximum evolution algebra or not; and step 7, outputting an optimal solution, and recording a radiation pattern corresponding tothe fitness value. According to the invention, a lower sidelobe level and a deeper zero point can be obtained.

The invention discloses a conformal array low sidelobe pattern synthesis method and system based on aperture field inversion and belongs to the technical field of microwave. The method comprises the following steps of S1, carrying out the aperture field inversion; S2, carrying out unit amplitude and phase compensation; S3, carrying out weighting amplitude optimization; and S4, synthesizing a far-field pattern. In the S2 and the S4, methods for obtaining conformal array antenna plane near-field data and synthesizing the far-field pattern are a time sharing data synthesizing conformal array testing method. The method and the system are applicable to an arbitrary curved surface conformal array antenna. Conformal array low sidelobe pattern synthesis efficiency is greatly improved. A new way for the conformal array low sidelobe pattern synthesis is provided. Through the aperture field inversion, conformal array optimization is transformed into plane array optimization. A cross polarizationand phase center non-co-planar complex solving process is avoided. The method and the system are deserved to be popularized.

The invention provides a sum-difference beam sparse array synthesis method for broadband wide-angle beam scanning, and relates to array antenna pattern synthesis and antenna array element position optimization. The method comprises the following steps: step 1, introducing a concept of'design frequency ', and converting a sum-difference beam array synthesis problem of broadband wide-angle beam scanning into a sum-difference beam array synthesis problem based on a single frequency point; step 2, carrying out initial layout on the array elements by adopting a power series increasing (RPS) analysis method; and step 3, performing multi-step array element position perturbation optimization at the'design frequency 'by adopting an iterative convex optimization method, and setting a plurality of constraint conditions in the optimization process, such as a sidelobe level constraint of a sum beam and a difference beam, a difference beam slope constraint in a target direction, an array element position perturbation quantity amplitude constraint, an array element minimum spacing constraint and the like. According to the method, the sum beam and the difference beam with the broadband wide-angle beam scanning performance can be generated at the same time by optimizing the array element layout, and a plurality of constraint conditions are set to meet actual application requirements.

The invention provides a sub-array phased array antenna pattern synthesis method based on Drosophila algorithm, which is mainly used for solving the problems that the prior art is prone to have more control parameters in the side lobe suppression process of the sub-array phased array antenna pattern, and is prone to fall into local optimization and premature convergence due to improper control parameters. A sub-array level phased array antenna population is taken as a drosophila population, and the particle collapse-orthogonal cross mechanism is adopted to update the sub-array normalized excitation value of the Drosophila population. The global optimal excitation value and the global optimal fitness value are obtained by an annealing simulation method. The method reduces the control parameters, improves the stability of the side lobe suppression method, and improves the side lobe suppression performance of the sub-array phased array antenna pattern amplitude.

The invention discloses a method for synthesizing vortex electromagnetic wave pattern based on a concentric circular ring array antenna, which comprises the following steps: S1, selecting basic functions according to the topological charge generated as required, and establishing a preliminary pattern function; S2, selecting the preliminary direction The graph function performs sidelobe level optimization to obtain the optimized function; S3, obtain the circular aperture excitation current of the optimized function, and bring it into the radiation pattern to obtain the direction diagram of the continuous surface source distribution; S4, convert the continuous surface The excitation current in the pattern of the source distribution is discretized to obtain the excitation current of the discrete concentric ring antenna, and then the vortex electromagnetic wave pattern based on the concentric ring array antenna is obtained, and the pattern synthesis is completed. The invention solves the comprehensive problem of the pattern of the vortex electromagnetic wave emission and reception in the vortex electromagnetic wave imaging, and provides theoretical support and design guidance for the experimental research of the vortex electromagnetic wave imaging.

The invention discloses a multi-objective optimization array pattern synthesis method based on an improved genetic algorithm, and belongs to the field of antenna array pattern synthesis. According to the method, the genetic algorithm is improved and optimized, and in order to avoid local convergence and prevent close-to-close combination, the Hamming distance is introduced to carry out close-to-close discrimination; in order to improve the convergence speed and ensure that an excellent mode in a parent body can be inherited to the next generation, the size of a crossover operator is adaptively determined according to the fitness. According to the method, a mutual coupling effect between array elements is considered, an active unit directional diagram is combined, an accurate antenna array model is constructed, different fitness function parameters are set for different target array directional diagrams, and an improved genetic algorithm is used for performing multi-target rapid optimization on the antenna array directional diagrams; finally, array synthesis such as beam broadening, low sidelobe, beam null, phased array scanning and the like is realized, and verification is carried out through full-wave electromagnetic simulation software.

A semiconductor test system includes a user device configured to operate a reference device in accordance with an interface signal based on a timing signal having a variable operating frequency, a pattern synthesis apparatus configured to measure an interval between adjacent edges of the timing signal transmitted from the user device, and extract a logic value of the interface signal in accordance with the timing signal so as to generate test pattern data, and a test device configured to receive the test pattern data, reconstruct the timing signal based on the measured interval, generate a test driving signal such that the logic value is extracted from a device under test (DUT) based on the reconstructed timing signal, and apply the test driving signal to the DUT so as to determine an operating state of the DUT.

The invention discloses a design method of a to-earth ultralow side lobe. The method comprises the following realizing steps: 1. establishing a coordinate system, and determining a to-earth region according to the altitude of a satellite orbital; 2. determining the number of partitions to be subjected to an ultralow side lobe pattern synthesis, and determining an initial region of each partition;3. separately performing the ultralow side lobe pattern synthesis on the region of each partition by using an improved alternating projection algorithm, so as to obtain an array weighting value of each partition separately subjected to the ultralow side lobe pattern synthesis, and determining an actual action region of each ultralow side lobe pattern; and 4. selecting an appropriate array weighting value according to a scanning angle of the pitching direction of a main beam. The design method can quickly perform the ultralow side lobe pattern synthesis on the to-earth region through a large-scale planar array, has a relatively good suppression effect on side lobes in the to-earth region, effectively lowers the demand for the dynamic range of an attenuator, improves the aperture efficiencyof the array, reduces the gain loss, has short array synthesis time, and can meet the demand of a satellite-borne phased array for to-earth side lobe suppression.

The invention provides a method for applying deep learning to conformal (irregular arrangement) array antenna radiation pattern synthesis. The method comprises the following steps of: 1, calculating a directional diagram sample set by utilizing a forward analytical method according to the design requirement of a directional diagram and aiming at the arrangement mode of a specific antenna array unit, and configuring a corresponding directional diagram feature tag for the sample set; and step 2, training end-to-end deep convolutional neural network structure parameters by taking the directional diagram and the directional diagram feature tag as neural network input data and taking the excitation distribution of the array unit as output, and finally obtaining a convolutional neural network with a relatively good effect. And step 3, outputting the amplitude and phase information of the corresponding array antenna unit after the trained neural network inputs the characteristic requirement of the target radiation pattern.

The invention discloses a three-dimensional texture pattern synthesis method based on dragonfly vision imaging model setting. The method comprises the steps that the two-dimensional texture patterns of the three-dimensional space under three different illumination angles are acquired; a dragonfly vision imaging model is established; multiple hexagonal texture pattern feature matching regions are set and aggregated into the three-dimensional texture patterns; a three-dimensional texture pattern feature matching function is set for performing image feature matching so as to perform three-dimensional texture pattern feature inputting and output the three-dimensional texture pattern matching features to perform matching; the optimal three-dimensional texture pattern feature matching distribution and the distribution region are set; three-dimensional texture pattern style setting is performed on the three-dimensional texture pattern style feature change; and feature matching optimization isperformed and the set three-dimensional texture patterns are synthesized. The three-dimensional texture pattern feature matching detail features are ensured not to be lost, the texture pattern features are continuous and the continuity and texture patterns of the three-dimensional texture pattern features can be greatly saved.

The invention provides a rapid array antenna pattern synthesis method based on a new optimization problem, relates to the field of array antennae, and constructs a new optimization problem of an array antenna pattern by introducing a phase of an expected radiation field as a design variable; the design variable is initialized; L-BFGS-B is used to find a local optimal solution for the new optimization problem; and whether the optimal solution meets a termination condition is judged, if so, a local optimal phase is output to obtain a corresponding array antenna pattern, and if not, iteration is continued until a satisfactory array antenna pattern is obtained. The method has the beneficial effects that the design variable dimension in the array antenna is greatly reduced, the calculation complexity is reduced, and the calculation speed of the comprehensive problem of the array antenna directional diagram is improved.

The invention provides a sparse antenna pattern synthesis method based on an ant lion algorithm, which is mainly used for solving the problems that the prior art is prone to trap into local optimization in the process of side lobe suppression of the sparse antenna, and overly relies on an initial solution, so as to reduce the side lobe suppression ability of the sparse antenna. The initializing population is divided into an elite ant lion, ant lion populations and ant populations according to the fitness value, At the same time, the elite ant lion, ant lion population and ant population are optimized by multiple alternating projection mechanism, differential evolution mechanism and stochastic optimization, which have the ability of global searching and fast convergence, so that the sidelobe and main lobe width suppression performance of the sparse antenna can be improved maximally under the condition of a small number of iterations.

The invention discloses a cross coupler based on mode synthesis and a construction method thereof, and an impedance matching structure. The cross coupler comprises a body, wherein the cross coupler body comprises two separator polarizers, and the two separator polarizers are symmetrically cascaded to form the body. Compared with a traditional cross coupler structure, the cross coupler is characterized in that the cross coupler is formed by symmetrically cascading two partition plate polarizers, and the cross coupler is obtained by superposing the separator polarizers under two excitation modes, namely an odd mode and an even mode, by adopting a mode synthesis method; and the cross coupler not only has the advantages of wide frequency band, low insertion loss and high isolation, but also issimple and compact in structure and easy to process, so the cross coupler based on a rectangular waveguide design can be widely applied to millimeter wave bands and can meet requirements of full-performance tests and basic performance tests of the cross coupler.

The invention provides a synthesis method of a hand painted pattern, relating to a pattern synthesis technology and providing a synthesis method of a hand painted pattern according to human vision mechanism features. The synthesis method comprises the following steps of: painting a pattern sample by using a digitizer; inputting the size of a synthesis pattern; clustering pattern elements in the pattern sample, and classifying each pattern element in the pattern sample into an element category; analyzing distribution features of the pattern elements; placing seed points to generate a seed drawings; constructing a mapping relation; mapping each seed point to one element category; and displacing each seed point into one pattern element to synthesize the pattern. The synthesis method can obtain the large-scale synthesis pattern similar to the pattern sample on the visual perception and overcomes the defects of the hand painted pattern. Compared with the pure hand painting method, the synthesis method can greatly improve the painting efficiency. The synthesized pattern has not periodic repeat on the structure. Compared with the traditional square continuous method, the synthesis effectis more vivid. Compared with a texture synthesis method, the synthesized pattern is more accordant with the human vision cognition low.