104 results about "Recursion method" patented technology

The invention discloses an automotive adaptive cruise control method taking multiple targets into consideration. A layer control strategy is utilized, upper layer control can decide an expected longitudinal acceleration according to a target vehicle and a current state of a controlled vehicle, and lower layer control can track the expected longitudinal acceleration through a reverse recursion method. The automotive adaptive cruise control method comprises the following steps: a mutual longitudinal dynamitic model between two vehicles is established, a design model predicating controller can obtain the expected distance between two vehicles according to a constant time headway strategy, a model prediction control algorithm is utilized to decide an expected longitudinal acceleration for tracking the expected distance between the two vehicles, vehicle control work conditions are divided into a driving work condition and a braking work condition, reverse longitudinal dynamic models for the two work conditions are established respectively according to a vehicle driving equation, an expected throttle percentage is obtained according to the vehicle reverse longitudinal dynamic model and the expected acceleration in the driving work condition, and an expected brake pedal openness is obtained according to the expected acceleration in the braking work condition.

A web based menu system that allows the users such as buyers and sellers to locate, purchase, and sell goods, items and services easily without any search queries. The knowledge base of the system increases with user interaction at variable levels. The database contains an orderly classification of goods and services throughout. Point-and-click technology can be used to navigate through a series of menus. The system can also respond to voice activation and recognition commands. At the web site, the user first selects a category followed by a selection of makes, items, or services called a Sub-Category that relate to the category. The system responds by displaying a uniform series of menus referred to as a "Fluidity of Taxonomy". This process repeats until the user reaches the finite end of the menu series. Next, the system completes the interaction based upon if the user is a buyer or a seller. For buyers, the database is accessed resulting in a list of ads based upon the user's accumulated menu selections. The user can filter and sort the presentation of ads based on various criteria and place requests for instant notification of subsequent new ad placements. Banner ads that are applicable to the buyers' area of interest are also presented by the system. For sellers, an input form for ad placement is presented based upon the user's accumulated menu selections. Sellers can also grow the database based on their menu selections and form input. The system can be used for retreiving any orderly classification of information.

An improved method and apparatus for Viterbi Algorithm calculations for maximum likelihood sequence estimators in communication receivers is disclosed. The calculations for the maximum likelihood sequence estimator, in accordance with the invention, utilizes a variant of the Viterbi algorithm developed by Ungerboeck in which the associated branch metric calculations for the trellis require the computation of a set of branch metric parameters. An embodiment of the present invention provides for an improved recursive method and apparatus for calculation of the branch metric parameters that reduces the number of processor clock cycles required per state metric calculation. This enables real time computation of the branch metric parameters during execution of the Viterbi Algorithm.

The invention belongs to the technical field of communication control and communication processing, and discloses an isolated forest-based binary classification abnormal point detection method and aninformation data processing terminal. The method comprises the steps of carrying out initial static average blocking on an original data set, and calculating the density in the block and the mean density; after calculating the density in each block of the static block, reducing the data set by taking the mean density of the original data set as a threshold value; constructing an isolated forest byusing a node recursion method; performing corresponding feature extraction and datamation on the original data set, and calculating the spatial position distances between the clustering center pointand other points; adding the abnormal score calculated on the basis of the density and the distance and the abnormal score calculated on the basis of the proof information and comparing with a corresponding threshold value. According to the method, the accuracy of an abnormal point detection algorithm is effectively improved, the actual data size in the abnormal detection process can be greatly reduced, the calculation resources are saved, and the abnormal detection efficiency is improved, and the robustness of an abnormal detection algorithm is enhanced.

The invention discloses a ballistic trajectory forming method based on output correlation adaptive Kalman filter. During the ballistic trajectory forming process, an output correlation functional matrix is estimated by the utilization of bullet flying parameters, and the optimal steady-state solution of Kalman filter gain matrix is calculated by the correlation functional matrix so as to make the steady-state gain fit in with an actual observed value; and the correlation functional matrix is continuously adjusted according to the observed value by a recursion method, and adaptive filtering estimation and correction of trajectory data are realized so as to obtain accurate ballistic trajectory. According to the invention, the filter divergence problem caused by factors such as incomplete consistency between a trajectory attribute model and an actual physical model, inaccurate system noise and observation noise parameter estimation and the like is inhibited effectively, and filtering accuracy and accuracy of the ballistic trajectory are raised.

The invention provides a semantic entity relation extraction method and device, and electronic equipment. The method relates to the fields of artificial intelligence and information extraction technology of natural language processing. The method comprises: identifying each word node of an input text; constructing a dependency characteristic of each word node; and when more than two word nodes arein a coordinating relation, extracting relational triples of candidate nodes by recursively calling pre-stored semantic rules; wherein the pre-stored semantic rules comprise a pre-modification structure rule and a verb-related rule. Compared with the prior art, the method and the device avoid extraction omission due to complicated rules and incomplete definitions by using a recursive method, andcan improve the accuracy of entity relation extraction.

The invention discloses a judgment method for the voltage level of a high power accessing power grid. The judgment method comprises the steps of constructing a target hierarchical structure; constructing a judgment matrix and a calculation target weight by an expert experience method; then calculating respective anti-entropy weight values of ten indexes under three target layers by an anti-entropy method, and obtaining a total weight by a hierarchical recursion method to obtain a reliable voltage level judgment result. Due to the combination of subjective and objective weighting methods, the stability and the objectiveness of a voltage level evaluation result are guaranteed when high power is accessed into a power grid.

Disclosed is a milk somatic cell counting method based on the computer vision. The method comprises the steps of dropping a coloring agent into milk, coloring somatic cells with the coloring agent, dropping the milk into a slide, and acquiring cell images by using a digital microscope, wherein the cell images are color images; preprocessing the cell images; and performing the cell image counting process: setting the somatic cell occupied pixel area range S1-S2; scanning cell binaryzation images progressively, and probing the size S of a communication area where the pixel is positioned by using a recursion method if a white pixel is found, wherein, the communication area to which the white pixel belongs is somatic cells if S1<=S<=S2, 1 is added to the somatic cell number count; otherwise, the somatic cell number count does not change; and obtaining the somatic cell number count in the cell images. According to the milk somatic cell counting method based on the computer vision, human factor influences are avoided effectively, the detection efficiency is high and the accuracy is good.

A term-by-document (or part-by-collection) matrix can be used to index documents (or collections) for information retrieval applications. Reducing the rank of the indexing matrix can further reduce the complexity of information retrieval. A method for index matrix rank reduction can involve computing a singular value decomposition and then retaining singular values based on the singular values corresponding to singular values of multiple topics. The expected singular values corresponding to a topic can be determined using the roots of a specially formed characteristic polynomial. The coefficients of the special characteristic polynomial can be based on computing the determinants of a Gram matrix of term (or part) probabilities, a method of recursion, or a method of recursion further weighted by the probability of document (or collection) lengths.

The invention provides an autonomous control method for a GEO (Geosynchronous) orbit satellite by using angle information only. The method comprises the steps of correcting the orbit deviation of a star sensor and an infrared earth sensor; calculating the projection of a geocentric unit vector in an inertial equatorial coordinate system; calculating longitude and latitude deviation between the current satellite and an ideal fixed point, and using a result as a filter observed quantity; using a C_W equation as a system equation and estimating the right ascension and the declination of the satellite by using a Kalman recursion method; determining the reference coordinate system of the current attitude control of the satellite by using the result; calculating the attitude deviation of the satellite by using the information of the star sensor again and using the attitude deviation as system control input; and repeating the steps to realize the autonomous continuous navigation and the autonomous attitude control of the satellite. By conducting the autonomous on-star resolution and the autonomous attitude control of the position of a spacecraft through on-star sensor observation only, the problems that a measurement and control network cannot be globally distributed and the measurement and control cost is high are solved, the autonomous running of the satellite is realized and the survivability of the satellite is improved.

The invention discloses a multi-controller optimal state estimation control strategy design method based on Kalman filtering, and the method comprises the steps: firstly carrying out the system modeling of a wireless networking control system, and analyzing the impact on the closed-loop control of the system when there is network transmission time delay in the wireless networking control system; secondly carrying out the research of the information fusion of distributed controllers, and constructing a network control optimization problem based on double distributed controllers; finally carrying out the Kalman filtering analysis of the platform state information received by the two controllers through employing a Kalman filtering algorithm, solving an optimal state estimation control strategy through an iteration regression method, and verifying the feasibility through a simulation experiment. The method solves a problem of an optimal state estimation control strategy of the distributedcontrollers when there is the transmission time delay in a wireless communication network and the accurate platform state information cannot be obtained because of the noise interference, thereby achieving a purpose of improving the stability of the networking control system and reducing the system loss through the cooperative control of the distributed controllers.

The present invention relates to a coordinated control method for the wind power plant of a double-fed fan to participate in the one-time frequency modulation of a power system and belongs to the operation and control technical field of the power system. The method comprises the steps of establishing energy status evaluation indexes and power generation level evaluation indexes for fans; setting a communication coefficient matrix between fans; measuring the frequency of the coordination layer of the wind power plant and generating the reference value of the output power of the wind power plant; exchanging power generation level evaluation indexes between adjacent fans, conducting the Newton iteration through the outer loop iteration method, and tracking a reference value generated by the coordination layer; during each iteration step, calculating the approximate Newton direction of the step by each fan through the inner loop recursion method. In this way, the necessary information is provided for the outer loop iteration operation. According to the technical scheme of the invention, the stored kinetic energy of a double-fed fan can be fully utilized, and a coordinated control system is designed to reduce the computational burden of the coordination layer. Meanwhile, based on the second-order convergence of the distributed Newton method, the rapid primary frequency modulation of the overall wind power plant is realized. At the same time, the power can be reasonably distributed among fans, so that the safe operation of the fans is ensured.

The invention relates to a combined selecting method and apparatus of transmitting and receiving antenna in wireless communication technique. The method comprises the steps that: step 1: a transmitting end transmits a training sequence, a receiving end carries out the channel estimate based on the received training sequence to obtain the MIMO channel transfers matrix; step 2: the receiving end uses a forward-inverse direction recursive method to perform the combined selecting of transmitting and receiving antenna; and step 3: the receiving end feeds back the transmitting antenna sequence number to the transmitting end by the mapping feedback or direct feedback. The apparatus includes a channel estimate unit, a transmitting and receiving antenna combined selecting unit, a feedback unit, which are used to perform the processes of the steps. The performance of the invention can approach to the high limit of the antenna selecting MIMO system, remarkably reduce the computing complexity as well as ensure the near-optimized channel capacity of the system, and has high application in MIMO system which has higher request of real time processing.

The invention discloses a parameter design method of a direct current side main loop of a flexible direct current system containing a superconducting direct current limiter, which comprises the following steps of: (1) determining a short circuit current peak value, a lightning arrester branch access moment and a most severe working condition; (2) calculating the relationship between the smoothingreactance and the short circuit current peak value; (3) solving the magnitude of the smoothing reactance; (4) solving the magnitude of the current limiting resistor. The parameter design method of thedirect current side main loop can fill the blank of the design research of the direct current main loop containing the superconducting current limiter and can play a certain guiding role for the design of the future engineering; the calculation formula of the short circuit current based on the recursion method can improve the calculation efficiency, avoid the time-consuming time domain simulationcalculation and reduce the time spent by the design of the direct current main loop under the premise of ensuring the effectiveness.

An automated and algorithmic method utilizing motor vehicle steering geometry knowledge, applicable to small and large turn angles, along with knowledge of motor vehicle understeer gradient, for determining motor vehicle yaw gain by which a motor vehicle yaw gain table is populated for use by an electronic stability control system of the motor vehicle. The method may utilize either a recursive methodology of population or an open loop methodology of population.

The invention discloses a self-adaptive trace tracking control method of an uncertain wheel type mobile robot. The self-adaptive trace tracking control method comprises the following steps: S1, establishing a kinetic equation of a system model module of the wheel type mobile robot; S2, aiming at unknown parameters of a robot system, adopting an integral inversion strategy to design a model of a control input module established based on a Lyapunov stability theory through a Lyapunov function recursion method. The self-adaptive trace tracking control method of the uncertain wheel type mobile robot, disclosed by the invention, has the advantages that influences of system parameter perturbation can be compensated relatively well, and the trace tracking performance and robustness of the mobilerobot are improved. Under conditions that part of parameters of a system are unknown and a boundary of external perturbation is unknown, the control precision is improved and the trace tracking performance and robustness of the mobile robot are ensured; the self-adaptive trace tracking control method has relatively good actual application value and social significance.

The method includes modified Cholesky decomposition, which decomposes system correlation matrix R into product of unit of lower triangular matrix, diagonal matrix and unit of upper triangular matrix. The method omits radication operation in traditional Cholesky decomposition, and reduces quantity of division operation greatly so as to be implemented by hardware. Based on features of matrix obtained by Cholesky decomposition, new double recursive algorithm is adopted. Thus, matrix recursion and recursion method for solving unit triangular coefficient matrix equation set prevents operation from solving matrix inversion. Advantages are: reducing complexity of software, easy of realizing reuse of storage space for recursion operation, saving power consumption and storage space of handset as much as possible so as to suit hardware implementation.

The invention relates to a grid grading method for near-surface ground motion simulation, and belongs to the field of engineering wave theory and seismology. The method comprises the following steps: firstly, a block to be researched is established, and a dynamic balance equation of the block to be researchedis established; secondly, the stress and displacement on the contour of the block to be researched are calculated; finally, by a recursive method, the stress field, displacement field and accelerated speed field of the block to be researched at the connecting part of a thick grid and a thin grid are calculated from time t to time t + <delta>t, and a speed field is calculated from time t - <delta>t/2 to time t + <delta> t/2. According to the method, an irregular grid with different steps can be adopted to disperse a calculation model, and the simulation process is efficient and flexible, and the calculation efficiency can be improved greatly.

The invention discloses an adaptive filtering method used for NSHV tracking filtering and an adaptive filtering system thereof. According to the method, a dynamical model (state transition equation) based on the unknown attack angle and a radar measurement model (measurement equation) are established; and a recursion method based on the suboptimal unbiased noise statistical estimator is acquired.The method is used for near space hypersonic boost-glide aircraft tracking so that the filtering stability and the tracking accuracy can be effectively enhanced, the rate average tracking accuracy canbe enhanced for 50% than that of the Sage-Husa adaptive method, the rate average tracking accuracy can be enhanced for 6.77% than that of the Sage-Husa adaptive method, and the geocentric distance tracking accuracy within 100m and speed tracking within 6m/s can meet the defense requirements of the near space hypersonic glide aircraft.

The invention discloses an emission wave beam nulling widening method based on orthogonal projection, and relates to the digital array radar emission wave beam nulling widening technology. The method utilizes a reconstruction zero setting vector matrix, and data volume is reduced greatly. In addition, in order to avoid matrix inversion operation, a Gram-Schmidt orthogonalization (GSO) thought is introduced, and a recursion method is employed to carry out deducing of orthogonal complementary space. The provided method achieves emission wave beam nulling widening rapidly and flexibly under a condition that an emission wave beam pointing direction, a zero setting direction and a nulling width are known and the anti-interference performance of the system is enhanced.

The invention provides a high-precision broadband measurement method for the dielectric property of a low-loss material. The high-precision broadband measurement method is applicable to a split type cylindrical resonant cavity. Two flange plates of the split type cylindrical resonant cavity form radial waveguides, the measured material is clamped between two half cavities to be measured in the modes of TE011, TE111, TE211, TE311, TE411, TE511, TE611, TE711, TE811 and TE911; all the measurement modes are identified through the constraint relation between the resonant frequencies of the measurement modes and dielectric constants on the basis of a recursion method, and the dielectric constants of the measured material at the resonant frequencies of the measurement modes are calculated. Meanwhile, material loss at the resonant frequencies of the measurement modes is calculated through the relation between quality factors of the measurement modes and material loss. In this way, the dielectric property of the low-loss material at multiple frequency points is obtained through measurement.

Method of generating a number of steps constituting an adaptable clinical workflow based on a recursive approach in which for each step of the workflow the following steps are executed: Selecting a number of knowledge bases to be included in a reasoning step on the basis of (a) goal(s), generating (a) query(ies) taking into account the goal(s), applying the selected knowledge bases and the generated queries to a reasoning engine so as to generate a solution, interpreting this solution by translating the solution given in a formal representation into (an) executable action(s) for the current step in the clinical workflow.