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 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.

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 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 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 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.

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.