70 results about "Position domain" patented technology

Continuous monitoring and fault diagnosis of rotating machinery during variable speed operation is performed using only a position feedback signal. The position sensor generates a periodic waveform having multiple pulses per revolution of the machine. A circuit is included to detect, for example, a zero crossing or edge of the periodic waveform. At each detected zero crossing or edge, the time and position of the event is stored in memory. Other data, such as the current in the motor, may also be sampled and stored in memory. Because the sampled data is triggered by repeated feature of the position feedback signal, the sampled data is in a stationary reference frame in the position domain. Frequency analysis is performed on the sampled data, and the frequency components present in either the sampled signal are analyzed to identify the presence of a fault in the rotating machinery.

The invention discloses a realization method and system for accessing data service, thus solving the problem of the existing technology that a user can not access the data service of the currently positioned domains of the other users. The method of the invention comprises the following steps: each user domain is provided with an application server, the service data of the positioned user domain are stored in the application server, a domain name server receives the domain name resolution request of user terminal; the domain name server obtains the address information, corresponding to the domain name to be analyzed, of the application server of the currently positioned user domain of the user terminal according to the correspondence of the stored domain name and the application server address and the name resolution request, and returns the obtained address information; and the service data of the currently positioned user domain of the user terminal are obtained from the corresponding application server according to the address information returned by the domain name server. By adopting the technical scheme of the invention, the user can access the data service of any currently positioned user domain.

The present invention relates to providing navigation guidance for mobile users, using Global Navigation Satellite Systems (GNSSs) for applications where the user position needs to be determined in real time while meeting the navigation requirements, especially integrity requirement, for the given application. The present invention assists in providing guidance with a high availability of integrity function by trading accuracy for integrity for two different types of navigation applications. A first type of application requires a capability of detecting an occurrence of multiple satellite signal faults; the first embodiment of the invention provides this capability with a high availability of integrity, using two or more independent GNSSs. A second type of application requires a capability of detecting an occurrence of a single satellite signal fault; the second embodiment of the invention provides this capability with a high availability of integrity, using any one or a combination of GNSSs. The detecting and deriving of both methods are (i) in position domain and (ii) determinative of mobile user safety.

The invention relates to a single-frequency dynamic cycle slip detection and restoration method based on position domain curve constraint, and the method comprises the steps: selecting a time window with a proper length, solving a kinetic model of a detected object in the time window through the positions of all epochs in the window, taking the obtained kinetic model as a constraint condition, andcombining the constraint condition and a three-difference observation equation of a current epoch for solving and obtaining a floating point cycle slip value; preferably, trying to fix a cycle slip solution through a LAMBDA method. The method is designed according to the data features of a single-frequency low-cost GNSS satellite. The method is suitable for a stationary measurement mode and a dynamic measurement mode. The method is suitable for the combined application of a single-satellite system and a multi-satellite system. A curve fitting constraint equation is built based on the positionparameters, the model strength is higher, and the method is not affected by the changes of available satellites, and is higher in stability. Compared with a conventional three-difference iteration solution baseline method, the method does not require the redundant observation quantity of a single epoch, is wider in application range, and is more suitable for actual application.

The invention provides a GBAS integrity performance evaluation method based on a pseudo-range error distribution model. The method is characterized in that an airborne receiving end collects pseudo-range error sample data for GBAS integrity performance evaluation, and comprises the following steps: a) grouping the pseudo-range error sample data; b) for each group of pseudo-range error samples, establishing a Gaussian kernel quadratic Gaussian polynomial tail distribution model; c) carrying out weighted sum on each group of pseudo-range error distribution model to obtain an overall pseudo-rangeerror distribution model; d) projecting the pseudo-range domain error to positioning domain error; e) calculating the probability that the positioning domain error is larger than an alarm limit to obtain an integrity risk probability value; and f) evaluating the integrity performance of a GBAS system. The GBAS integrity performance evaluation method based on the pseudo-range error distribution model improves calculation accuracy of the integrity risk probability value and improves effectiveness of integrity assessment.

The invention discloses a method for inhibiting position domain periodic interference of an electromechanical servo system based on time sampling, belongs to the technical field of servo control, and solves the problem that the accuracy of equipment is seriously affected by the position domain periodic interference in the conventional electromechanical servo system. According to the technical main points, the method comprises the following steps: performing frequency characteristic testing and modeling on a controlled object by the electromechanical servo system; designing a stabilizing controller for an obtained controlled object model; testing the position domain periodic interference of the electromechanical servo system by utilizing a closed loop system with the stabilizing controller to obtain the frequency and the amplitude value of the position domain periodic interference; designing a position domain repetitive controller according to the tested frequency of the position domain periodic interference, and performing discretization on the position domain repetitive controller; setting parameters of the repetitive controller and designing a low-pass filter; embedding the repetitive controller which is subjected to the discretization into the electromechanical servo system, so that the purpose of inhibiting the position domain periodic interference is achieved. The method disclosed by the invention is applicable to inhibiting the position domain periodic interference of the electromechanical servo system.

The invention relates to a TCAM (Ternary Content Addressable Memory) multi-mode character string matching method and device. The method comprises the steps of: receiving a multi-mode character string and character string configuration information input by a user, and selecting a TCAM with qualified TCAM list item width, TCAM capacity and TCAM working frequency according to the multi-mode character string and the character string configuration information; storing the multi-mode character string in the TCAM according to the fact that the value of a position domain and a front mask domain are used for characterizing character string offset and a character ring domain contains mode character ring contents; receiving a to-be-matched character string input by the user, and dividing the to-be-matched character string into a plurality of character fields according to the byte number repeatedly sent each time the matching is performed and the TCAM list item width; sending the character fieldsand the corresponding matching sequence values to the TCAM for matching; and obtaining and outputting matched results of the character string from the TCAM. According to the method and device disclosed by the invention, the scale of multi-mode character string matching is equivalent to the TCAM capacity, and the matching speed is equivalent to the TCAM matching bandwidth, therefore the scale and the speed of the multi-mode character string matching are increased.

The invention provides a method and device for editing characters by using gestures. The method comprises the steps of: comparing position data of use input strokes with position domain value data of at least one corresponding character, and further judging that the input strokes are whether the input strokes are used for edition and a user selects which characters for edition; when judging that the input stokes are intersected with the characters, further obtaining geometrical characteristics of the input strokes according to the obtained position data, and judging whether the input strokes are edition gestures according to the obtained geometrical characteristics; if yes, making corresponding edition processing on the characters intersected with the input strokes. Therefore, the method provided by the invention can be used for directly carrying out corresponding edition processing on the corresponding characters through the corresponding characters selected by the edition gestures, is simple in an operation process, and is convenient and rapid in use of a user, therefore, operation time when the user edits the characters can be saved, condition of breaking a user though train due to longer operation time interval is avoided as soon as possible, and user experience is improved.

The invention belongs to the technical field of satellite precise navigation and positioning, and particularly relates to an integrity monitoring based baseline deformation detection method capable of improving the monitoring reliability of satellite navigation and positioning for baseline deformation. The integrity monitoring based baseline deformation detection method comprises the steps of 1, detecting baseline deformation according to integrity monitoring, analyzing multiple types of errors, and acquiring an optimal estimated value of a baseline solution by combining multi-reference consistency detection and a total least square theory through introducing a multi-reference receiver; 2, introducing an adaptive attenuation factor into a positioning domain according to the characteristic that reference receiver faults and baseline deformation are major integrity risk sources, and designing a Kalman filtering based multi-reference consistency detection algorithm and the like. According to the detection for baseline deformation according to integrity monitoring, the multi-reference receiver is introduced, the optimal estimated value of the baseline solution is acquired through combining integrity monitoring for the deformation with the multi-reference consistency detection and the total least square theory, and integrity monitoring based baseline deformation detection is realized.

The invention provides a wireless resource united control method applied in communication technology field. In the method, wireless resource in related geographical area is integrally controlled by constructing a layered wireless resource control network which consists of pyramid topology network entity; the network entity adopts layered management and establishes related synchronization system to guarantee the communication equipment of the geographical area to select free competition, cooperation and central control style for using wireless resource; wireless resource constitutes wireless resource container of European space according to time domain, frequency domain, geographical position domain and energy domain; wireless resource control network dynamically divides and uses wireless resource container at different dimension space. The invention has merits of promoting utilization rate of wireless resource and avoiding wireless interference of homogeneous network or heterogeneous network.

The invention discloses a positioning method based on three-dimension-to-one-direction carrier phase whole cycle ambiguity search. The ambiguity search calculated quantity can be reduced to a large degree, and rapid determination of a whole cycle ambiguity position domain search method is achieved. Meanwhile, according to the method, satellites with large observed quantity errors can be eliminated while whole cycle ambiguity is determined, high-accuracy positioning is completed, and positioning accuracy and reliability are effectively guaranteed. The method can be used for a multi-constellation GNSS compatible system or single system including a GPS, a GLONASS, a Compass, a Galileo and the like, and rapid determination and high-accuracy positioning of the whole cycle ambiguity are achieved.

The invention provides a method for realizing peripheral access control based on MMU (memory management unit) in an ARM virtual machine. The method comprises the following steps of: firstly, for a peripheral device required to be monitored by the virtual machine, changing a segmental page table item mapping corresponding to the physical register address of the peripheral device in each upper operating system; changing the position Domain in a corresponding page table item to a wrong value and simultaneously establishing a correct address mapping of the peripheral device in the address space of a bottom virtual machine wherein the bottom virtual machine takes over the data exception processing of hardware to capture possible address access mistakes of the upper operating systems; if Domain Fault occurs during address translation of the MMU when the upper operating systems access the address of the peripheral device, entering data exception processing mode of a processor; judging whether the mode is of the Domain Fault type or not by reading a hardware register when the action is captured by the virtual machine; if not, returning to the address space of the operating systems; and if so, processing the current access data of the operating systems by the bottom virtual machine, and allowing the virtual machines to access the corresponding peripheral register according to the processed data. The method solves the problem that the conflict of access to the same one peripheral device occurs when multiple operating systems run at the same time.

The invention discloses an SAR imaging method based on spatial domain support area fusion, mainly comprising the following steps: acquiring sub-aperture echo data; carrying out 2D fast Fourier transform, range matching filtering, phase compensation, expanded stolt interpolation and range pulse compression on the sub-aperture echo data, and getting range distance domain-azimuth wave number domain sub-aperture data after range pulse compression through calculation; de-chirping the range distance domain-azimuth wave number domain sub-aperture data after range pulse compression to get de-chirped range distance domain-azimuth wave number domain sub-aperture data, carrying out azimuth inverse fast Fourier transform on the de-chirped range distance domain-azimuth wave number domain sub-aperture data to get 2D position domain sub-aperture data, and calculating imaging data of each sub-aperture; and getting an azimuth focused full-aperture high-resolution SAR image.

The invention provides a virtual transponder capture method and capture system based on satellite space distribution inspection. The virtual transponder capture method comprises the following steps: firstly, establishing a virtual transponder basic database; then acquiring the current position and running state of a train according to satellite navigation, and predicting a target virtual transponder to be captured and a pre-capturing triggering moment according to the basic database; from the pre-capturing triggering moment, calculating a visual satellite space distribution characteristic value and a prediction value in real time; meanwhile, estimating a satellite spatial distribution reference value according to the basic database; judging the capture state of the target virtual transponder to be captured according to the satellite spatial distribution characteristic value, the characteristic value prediction value and the reference value; and determining the capture moment, correcting the current position of the train and updating the virtual transponder basic database. According to the method, the limitation of implementing capture space analysis from a positioning domain is overcome, the capture precision and real-time performance of the virtual transponder are improved, and the design, development and equipment manufacturing of a novel train control system can be effectively supported.

The invention provides a position domain impedance control method and device, a storage medium and an operation robot. A three-stage cascade control closed loop of a position planning loop, an impedance control loop and a speed control loop is established so that the robot can complete the movement of a predetermined trajectory, any position trajectory can be superposed at any time through position planning, and the instability of a control system cannot be caused. When the robot touches a fixed obstacle, the robot can immediately stop moving to prevent collision. Besides, the actual movementdistance of the robot is introduced as the independent variable of the system, the continuous integration of the closed-loop control error is not caused by the time migration when the robot stops moving, the overshoot of the control input after the obstacle quits is not caused, and the position and force control of the robot in the position domain is realized.

The invention relates to an electric vehicle charging position data privacy convergence method based on local differential privacy. According to the method, on the basis of analysis of application scenarios and charging position data characteristics, a novel Bayesian multi-pseudo local differential privacy method and a method based on power supply line partitioning are combined, and the electric vehicle charging position data privacy convergence method is designed. According to the method, the disturbance output sample size is increased through a Bayesian multi-pseudo method, and meanwhile, the availability of an electric vehicle charging position data aggregation result is effectively improved in a manner of reducing a privacy position domain by partition.

The invention discloses a method and a device for reducing motor torque ripple. An augmented system is constructed in a position domain by adopting an electrical angle of a motor as an independent variable, a finite element mesh is constructed by adopting an electrical angular velocity of the motor as an intermediate parameter, a stabilizer is designed for the augmented system, an infinite-dimensional matrix inequality is transformed into a finite-dimensional matrix, a first target control parameter matrix and a second target control parameter matrix are obtained according to motor position sampling signals obtained periodically, output quantity is calculated according to updated control parameter matrixes and motor current value, motor operation is controlled according to the output quantity, the motor torque ripple is reduced, that is, reduction of the motor torque ripple is associated with tracking control based on a turning angle variation system, so that the motor torque ripple isreduced effectively, power loss is reduced, system efficiency is increased, and driving comfort is improved.

The invention provides a dynamic baseline positioning domain monitoring method based on satellite navigation and inertial navigation. The method comprises the following steps: a) determining a coordinate system and a conversion matrix; b) calculating a coordinate theoretical value of the antenna baseline vector under an earth-centered earth-fixed coordinate system in the movement process of the base station carrier; c) determining the number of antenna baseline vectors to be monitored; d) resolving the measured value of the antenna baseline vector; e) calculating positioning domain errors of the antenna baseline vector change rate in x, y and z directions at the epoch k moment, and normalizing the positioning domain errors to obtain normalized values of the positioning domain errors; f) obtaining a cumulative sum value; and g) comparing the cumulative sum value with an error monitoring threshold, and sending an integrity risk alarm. According to the method, errors generated by vector position measurement of the baseline between the antennas are reduced, the accuracy of protection-level calculation is improved, the integrity risk in the aircraft dynamic-to-dynamic approach landing process is reduced, and the performance improvement of a propulsion dynamic-to-dynamic approach guiding system is facilitated.

The invention discloses a method for sampling and diagnosing position sequences of a reciprocating machine. The method comprises sampling and diagnosing steps as follows: step one, trigger sequences are generated when N Hall sensors uniformly distributed on the side surface of a cylinder are close to a magnetic pole embedded in a piston, an acoustic emission sensor collects an acoustic emission position sequence of a corresponding position domain of each Hall sensor, a vibration acceleration sensor collects a vibration position sequence of a corresponding position domain of each Hall sensor, and an acoustic emission position sequence sampling matrix set and a vibration position sequence sampling matrix set are formed; and step two, according to the acoustic emission position sequence sampling matrix set formed by the acoustic emission position sequences and the vibration position sequence sampling matrix set formed by the vibration position sequences, the health condition of the reciprocating machine is judged in combination of definition of the acoustic emission position sequence sampling matrix set and the vibration position sequence sampling matrix set and diagnosis domains.

The invention relates to a differential privacy time sequence position publishing method and system based on a personalized privacy policy, and the method comprises the steps: determining an LBS service position domain, carrying out the grid division, dividing the LBS service position domain into a plurality of position points, and obtaining the position points under a grid coordinate system, wherein each grid comprises a position point; constructing an initial undirected graph according to all position points under the grid coordinate system; obtaining a probability state transition matrix of the hidden Markov model according to the historical position data of the user; and disturbing the real position of the user based on the probability state transition matrix and the initial undirected graph in combination with a Laplacian mechanism, and obtaining and publishing a disturbed position. The user is allowed to customize the connection relation between the nodes in the undirected graph in a personalized manner, so that the user can adjust the privacy protection degree according to the privacy requirement of the user. Meanwhile, Laplace noise is introduced, and the time sequence position is published by using the hidden Markov model, so that the security of user position publishing is improved, and the privacy leakage of the real position of a user is avoided.

In a method for improving the quality, particularly the signal-to-noise ratio, of an image, first image data are subjected to a mathematical operation in the position domain that improves the image quality, with picture elements in the environment of the individual picture element, for each individual picture element of the image to be subjected to the mathematical operation are provided with mutually independent, first weighting factors that have a magnitude dependent on the spatial distance of the respective picture element of the environment from the individual picture element, and with which the mathematical operation is implemented for the individual picture element. Picture elements in the environment of the individual picture element for each individual picture element of the image are additionally provided with mutually independent, second weighting factors that have a magnitude dependent on intensity differences or color differences of the respective picture element of the environment compared to the individual picture element. The method enables an improvement of the image quality with approximately unaltered sharpness and can be realized as a real-time procedure in medical imaging.

Methods and apparatuses for a receiver of signals from one or more satellite navigational systems to detect and/or eliminate impaired satellites from the set of estimated/acquired satellites in view are described. One method includes acquiring coarse position, time, and frequency values for each of a plurality of satellites from one or more satellite navigational systems, the plurality of satellites being those currently estimated to be in view of the receiver; determining whether one or more of the acquired coarse values are within a minimum range; and if it is determined that the one or more acquired coarse values are within the minimum range: determining a pseudo-true peak of a position domain correlogram comprising Line of Sight (LOS) vectors of each of the plurality of satellites; and identifying any satellite whose cross-correlation peak is beyond a maximum distance from the pseudo-true peak as an impaired satellite.