52 results about "Pattern synthesis" patented technology

An adaptive processing method of and system for clutter rejection in a phased array beam pattern. The amplitude distribution of the transmit elements of a two-dimensional phased array is determined. A desired pattern with low side lobes for a linear array is synthesized. The amplitude distribution of the transmit elements of the two-dimensional phased array is compared with the synthesized pattern. Select elements of the two-dimensional array are disabled to best fit the determined amplitude distribution of the transmit elements of the two-dimensional phased array to the synthesized beam pattern. Phase only pattern synthesis is performed to produce a desired two-dimensional beam pattern with low side lobes to minimize any best fit errors.

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 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.

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 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 discloses a cross coupler based on mode synthesis, a construction method and an impedance matching structure. Compared with the traditional cross-coupler structure, the cross-coupler of the present invention is formed by symmetrical cascading of two diaphragm polarizers, and the method of mode synthesis is used to make the diaphragm polarizer operate in both odd mode and even mode. The cross coupler is superimposed under the excitation mode, which not only has the advantages of wide frequency band, low insertion loss and high isolation, but also has a simple and compact structure and is easy to process, so that the cross coupler based on the rectangular waveguide design can be widely used in the millimeter wave band The application can meet the full performance test and the basic test performance of the cross coupler.

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 effectis more vivid. Compared with a texture synthesis method, the synthesized pattern is more accordant with the human vision cognition low.