208results about How to "Reduce communication burden" patented technology

The invention discloses an environment noise wireless real-time monitoring system based on a ZigBee technology, mainly comprising a noise monitoring control device and more than one terminal noise monitoring device, wherein the terminal noise monitoring device and the noise monitoring control device are connected by a wireless communication mode. The environment noise wireless real-time monitoring system based on the ZigBee technology can be used for monitoring municipal environment noise, and has broad application prospect; noise intensity analysis is carried out in a dispersed mode at each terminal noise monitoring device, the treatment pressure and system communication expense of the noise monitoring control device are reduced, and the system data treatment delay and transmission delayare reduced to realize real-time noise monitoring; and a ZigBee noise monitoring network has the characteristic of self organization, and the terminal noise monitoring devices are easy to join the network, thereby greatly facilitating the extension of system capacity.

The invention relates to a distributed online monitoring system and method for an electric energy metering device. The distributed online monitoring system for the electric energy metering device at least comprises a monitoring subsystem (4) for the electric energy metering device in a transformer substation, a customer electric energy meter centralized reading motoring subsystem (9), a monitoring unit (10) for the electric energy metering device in a metering point and a monitoring center (7) for the electric energy metering device in a power supply company. Data abnormality and fault early-warning, error alarming and inspection and verification request judgment are performed through an on-site monitoring device; relevant power grid event information is acquired through a master monitoring station (6) for the electric energy metering device in the transformer substation and the monitoring center (7) for the electric energy metering device in the power supply company to be used for assisting in decision making; finally, the decision is made through business personnel. The traditional regular inspection and verification mode is broken, and the inspection, verification or maintenance efficiency is high. The communication burden on a monitoring network is reduced, the requirements for a communication environment are lowered, data amount of the master monitoring station (6) for the electric energy metering device in the transformer substation and the monitoring center (7) for the electric energy metering device in the power supply company is reduced, and the operation efficiency is higher.

The invention discloses a flexible dynamic deployment system and method for a render cluster. The system comprises a rendering task management platform and a rendering unit control dispatcher, and the rendering task management platform is used for distributing tasks to the rendering unit control dispatcher of a cluster management node and receiving task processing schedule information uploaded by the rendering unit control dispatcher of the cluster management node. The rendering unit control dispatcher is used for distributing tasks to a plurality of rendering units and receiving task processing schedule information fed back from each rendering unit, and is used for processing the computing node requests of the rendering units and dynamically adjusting the number of the computing nodes in the rendering units according to a priority sequence in the process of executing the rendering tasks. Each rendering unit comprises a rendering unit Master course, the rendering unit Master courses are in communication with the computing nodes, and one computing node corresponds to one rendering unit Slave course. Computing resources are effectively utilized, and the resource use ratio is maximized. Under the condition of not influencing service quality, the number of the system concurrence users of the render cluster is increased.

The invention relates to a multi-intelligent stand-alone servo control system based on dual redundant CAN bus communication. A main servo control drive receives the instruction of a host computer, so as to carry out corresponding operation. The instruction received by the host computer is redundantly sent to a servo control drive through a first CAN bus and a second CAN bus, wherein the first CAN bus and the second CAN bus are peer to each other. An instruction operation result and measurement parameters are fed back to the host computer, wherein the instruction operation result and the measurement parameters are sent by the main servo control drive in the system and an auxiliary servo control drive. Without increasing additional data transmission, bus error self-diagnosis and bus state self-diagnosis are carried out on the dual redundant CAN buses are in real time. When communication bus abnormities are found through self-diagnosis, corresponding self-recovery measures are taken for self-recovery. The system is used for the communication of different intelligent stand-alones of a rocket flight control servo system, realizes highly reliable communication with relatively low cost, has the functions of self-diagnosis and self-recovery, and ensures the high reliability of a rocket and other flight control systems.

A first control circuit section (master station) and a second control circuit section (substation) communicate with each other via series-parallel converters. The master station includes regular transmission device and transmission-permitting signal generation device; and the sub station includes regular report device, confirmation reply device relative to a transmission data from the master station, and an unprocessed data table. The unprocessed data table prevents jam-up in upstream communication from the sub station to the master station, enabling to carry out timely regular transmission and regular reporting. Transmission from the sub station to the master station is performed based on a transmission-permitting control signal that the master station generates. Consequently, it is possible to execute communication error processing and diminish communication control burden on the master station while properly performing the regular transmission and regular report between the master station and sub station.

The invention relates to a comprehensive fault positioning method of a transmission line. When it is detected that a single-phase grounding fault occurs in a power transmission system, Prony fitting is carried out on zero-sequence currents of detection points within T / 4 after the fault, a dominant prony component of the transient zero-sequence currents is extracted, and the amplitude, phase, frequency and attenuation factor of the dominant component are uploaded to a system main station; the relative entropy of adjacent detection points is calculated, and a fault section is positioned according to the characteristic that the waveforms of zero-sequence currents of two points at the same side of the fault point is high in similarity and the waveforms of zero-sequence currents of two points at the two sides of the fault point is low in similarity; and in the positioned fault section, the fault distance is measured by utilizing an injection method. Thus, the upload data bulk is reduced, main characteristics of current signals are not lost, the communication pressure is reduced, and the fault positioning precision is improved.

A marine vessel control system includes a control unit, a first communication bus, a second communication bus, and an auxiliary device connection section. The control unit includes a main output section arranged to output marine vessel maneuvering control information including starting information of a marine vessel propulsion device, and a sub output section arranged to output backup information including the starting information of the marine vessel propulsion device. The first communication bus is connected to the marine vessel propulsion device and the control unit, and is arranged to transmit the marine vessel maneuvering control information to the marine vessel propulsion device. The second communication bus is connected to the marine vessel propulsion device and the control unit, and is arranged to transmit the backup information to the marine vessel propulsion device. The second communication bus includes an auxiliary device connection section that is arranged to enable connection of an auxiliary device that executes communication, related to auxiliary information other than the marine vessel maneuvering control information, with at least one of the marine vessel propulsion device and the control unit via the second communication bus.

The invention discloses a fuzzy control method based on an event trigger strategy for a non-linear inverted pendulum system. The method comprises the following steps: 1, establishing a dynamic mathematical model of an inverted pendulum system with a delay resonator; 2, setting an event trigger strategy of the inverted pendulum system, and constructing a fuzzy controller for the inverted pendulum system with the delay resonator; and 3, transmitting a control instruction to an actuator of the inverted pendulum system by virtue of an event trigger mechanism by a fuzzy controller u(k), thereby realizing the objective of control. The fuzzy control method disclosed by the invention has complete robustness on changes of system parameters and external interference, buffeting is eliminated, and thesystem has excellent stability. Moreover, due to the use of the event trigger mechanism, the inverted pendulum system effectively suppresses time-varying delay characteristics, communication burdensare effectively alleviated, and bandwidth resources are saved.

A method is described, for use with an SPS mobile terminal receiver 102, of providing a compact assistance vector to initialize and constrain the computation of the terminal's location within a region of validity. The compact assistance vector is provided to a computing node 108 able also to obtain measurements from a mobile terminal satellite positioning system receiver within said region. For a known reference point 104 within the region, the range or ranges from the reference point to one or more satellites 101 of the satellite positioning system are obtained. The range or ranges are represented by a number or numbers of ranging code repeat intervals in a limited resolution format. The compact assistance vector is created from the representation or representations of ranging code repeat intervals and transferred to the computing node 108. The compact assistance vector can then be used to initialize a location computation for the SPS mobile terminal receiver 102.

A distributed ring main unit monitor terminal is characterized in that: a microprocessor MCU is set to be a digital signal processor (DSP), peripherals are composed of a CAN communication interface, an RS 232 communication interface, an RS 485 communication interface, an information storage circuit, an alternating current sample circuit, a direct current sample circuit, a digital input circuit, a digital output circuit and a power supply circuit; wherein, the alternating current sample circuit is provided with a signal acquisition unit which comprises each current transformer(CT) and each pressure transformator(PT), which are coupled with a network; a monitor signal sampled by the signal acquisition unit is transferred in a filter circuit and a capacitance divider circuit and output in a multi-chip cascade AD sampler chip in a differential mode for sampling. A multipath real-time monitoring of the ring main unit monitor terminal can be realized by the invention.

The invention discloses a vehicular ad hoc network group awareness data report duplication eliminating method. According to the method, through adoption of an ECC algorithm, secure and reliable task distribution is realized, a label part of a ciphertext is hidden in a communication process, and fog nodes detect awareness report uniqueness and does not detect specific content of reports, so the privacy protection in a data duplication eliminating process can be realized, and a data counterfeiting attack can be resisted. According to the method, in order to record vehicle contributions in a report duplication eliminating process, signature aggregation is supported through adoption of an improved multi-signature scheme based on identities. According to the scheme, an efficient and secure aggregation confirmation function can be realized, and moreover, vehicles making contributions to the group awareness reports also can be recorded.

A cache coherence mechanism for a shared memory computer architecture employs tokens to designate a particular node's rights with respect to writing or reading a block of shared memory. The token system provides a correctness substrate to which a number of performance protocols may be freely added.

The invention relates to a formation flying spacecraft back-stepping sliding-mode control method, and belongs to the technical field of spacecraft posture adjustment. By the back-stepping sliding-modemethod, two distributed robust consistency tracking controllers are designed. The first robust controller can compensate known bounded external interface, is continuous and free from buffeting. In order to meet the use requirements of self-adaptive control, the second robust finite time controller does not need the upper bound of the known external interface. As the two controllers are designed based on a rotation matrix, attitude represented by the rotation matrix has global unique attribute, and the shortcoming of system unwinding can be overcome. By the aid of Lyapunov theorem, a whole closed-loop system is stable in finite time, simulation experiments prove that absolute attitude can be tracked, and formation member attitude consistency can be kept.

This invention discloses a four-layer encryption method for double grouping an encrypted authorization management system including the following steps: setting up a user ciphered key tree according to a subset difference / hierarchical subset difference unit when settin up the encrypted authorization management system to distribute pre-distributed key of users, the ciphered authorization and management system applies a four-layer of ciphered structure of double grouping to service and users to encrypt digit content in real time when distributing digit content to set up broadcasting authorization information and authorization management information to all users to be analyzed and de-ciphered by the receiving end to compute content key to decipher the digit content.

The invention relates to a local type node management method of the wireless sensor network, which comprises the steps that at the current sampling time, a working node in a first node collection can predict that the alternative area where the ideal node combination with the optimum positioning performance at the time of the next sampling is positioned can be provided; each node in the first node collection can broadcast the forecasting information including the alternative area to other nodes in the wireless sensor network; the node which receives the forecasting information judged whether is positioned within the alternative area, and if the node is positioned within the alternative area, the node is added to a second node collection; the alternative nodes in the second node collection can mutually confirm the location and the condition of the other node, and the alternative nodes can come into the working condition at the next sampling time. The invention can effectively avoid the disadvantages that the computing load of the traditional overall type node management method is large, the storage demand is large, the complexity of the system is large, the structure is complex, the expansibility is not strong etc., the invention can rapidly obtain the node combination which can position the object with very high precision, the working complexity of the system can be reduced, and the network service life can be prolonged.

The invention provides a distributed group robot cooperative clustering algorithm based on an improved gene regulation network. Through embedding a diamond mesh distribution equation and a trajectoryfollowing equation in a gene regulation network model based on the Turing reaction diffusion mechanism, the moving vector speed of each robot is controlled, thus each robot whose initial state is in random distribution always gathers at a preset cluster trajectory position at a time t, the robots are arranged in a self-organized way to be in a diamond mesh distribution and can avoid obstacles in adynamic environment and repair formation by themselves. Parameter values in the improved gene regulation network are given by an NSGA II optimization algorithm. The distributed group robot cooperative clustering algorithm has the advantages of low computational complexity and good expansibility, for any robot, only the collection of the location information of a neighboring robot is needed, so arequired communication range is small, and the communication burden is effectively reduced. In addition, if some robots fail in operation, a system can still work normally, and the algorithm has goodrobustness and a great application prospect.

Upon a request for a teleportation operation, a user of a virtual universe is provided with an interface for specification of image resolution parameters for initial rendering of a teleportation destination and the user's avatar which are degraded from a full resolution rendering of the teleportation destination and avatar. Degradation of resolution can be in regard to any of a plurality of image qualities such as spatial resolution, temporal resolution colors or color depth, light modeling and rendering style or the like or combinations thereof. Alternatively, a degraded copy of the teleportation destination can be provided as an alternative initial teleportation destination image. Since a rendering of a degraded image can be done with reduced response time, the user is thus provided with full control over a trade-off between image quality and response time and teleportation operations are thus encouraged.

The invention provides a distributed mobile mechanical arm task layered optimization control method based on generalized coordinates. A main task is that a plurality of mobile mechanical arms carry atarget object through cooperation of an end executor to enable the center of the target object to track a given reference trajectory, and a subtask is that joint angles and a mobile base formation arecontrolled to avoid obstacles through the sum of the maximum operability of all the mechanical arms; and by introducing the generalized coordinates, the tasks are divided into optimization layers andcontrol layers, reasonable allocation of redundancy in the control process is realized, and conflict with the main task is avoided while the subtask is completed. The fully-distributed control methodcan be used for realizing cooperative control over the multiple distributed mobile mechanical arms.

The present invention relates to a method and device for electric car cluster power regulation based on two-stage cross control. The method comprises the following steps: 1) establishing a grid-connected model of electric car cluster active and reactive mixed control, and determining an objective function for performing active and reactive optimization control of an electric car cluster and constraint conditions thereof; 2) establishing an objective function for performing active optimization of the electric car cluster and constraint conditions thereof; 3) dividing the charging duration of the electric car cluster into a plurality of power control durations; 4) performing solution of the objective function for active power control, and obtaining an active power optimization result; 5) establishing an objective function for performing grid-connected reactive optimization of the electric car cluster and constraint conditions thereof; 6) performing solution of the objective function for reactive optimization, and obtaining a reactive power optimization result; and 7) repeating the step 4), the step 5) and the step 6, and performing active optimization and reactive optimization for the electric car cluster in each power control duration. The method and device for electric car cluster power regulation based on the two-stage cross control can be widely applied to the power regulation of the electric car cluster.

The invention discloses an online grid fault detection method based on relative protection entropy and nominal transition resistance. According to the method, when a regional online detection system operating in a main unit on the monitoring layer of a transformer substation finds out that a protection signal, corresponding to a protection device, of a certain circuit in the station is started, online grid fault detection is started, seven kinds of protective action values of the two ends of the circuit and adjacent circuits are collected through a local area network and a wide area communication network, the relative protection entropy values of the circuit and adjacent circuits are calculated and ranked from large to small, circuits the relative protection entropy values of which are ranked first and second are taken as suspected circuits, and the relative protection entropy values of the two circuits are compared with a relative protection entropy threshold value to judge the fault circuit with multiple criteria. According to the method, the relative protection entropy fault detection method and the limited PMU-based nominal transition resistance fault detection method are combined, faults of a single circuit, double faults of two non-adjacent circuits and complicated faults of two adjacent circuits can be detected effectively, and fault tolerance of grid fault detection is improved greatly.

The invention discloses a target state estimation method and system. The method comprises the following steps: acquiring a communication topological graph of a distributed sensor network; obtaining anobservation model of a nonlinear system and prediction information of a sensor at the previous moment; calculating interaction information of the sensor at the current moment according to the observation model and the prediction information of the sensor at the previous moment, and enabling the interaction information of the sensor and the interaction information of a neighbor node sensor to interact with each other; according to the interaction information of the sensor and the interaction information of the neighbor node sensor, performing fusion by a weighted average consistency algorithmto obtain state estimation parameters of the sensor at the current moment, wherein the state estimation parameters of the sensor comprise a state estimation value and an error covariance estimation matrix of the sensor; and determining the state estimation parameter of the sensor at the current moment as the state estimation parameter of the target at the current moment. The method can reduce thecommunication burden of the network, guarantees that the filtering result cannot be diverged, improves the network communication efficiency, and improves the estimation precision of the target state.

The invention discloses a multi-spacecraft cooperative control method based on integral sliding mode and model predictive control. The method comprises the following steps: 1, establishing a spacecraft attitude dynamics model, obtaining a spacecraft attitude dynamics model of Lagrangian form by transformation, and further obtaining a spacecraft attitude dynamics model in the state space; 2, adopting a random communication protocol between multiple spacecrafts, and modeling the random communication protocol as a Markov jump model; and 3, using a hybrid control method combining integral slidingmode control and robust model prediction control to obtain the amount of control for each spacecraft, thereby solving the problem of communication defects and insufficient anti-interference in the multi-spacecraft cooperative control in the prior art. The multi-spacecraft cooperative control method based on integral sliding mode and model predictive control can perform cooperative control on multiple spacecrafts by fully utilizing the advantage of the integral sliding mode control to effectively suppress the matching interference, and combining the characteristic of the robust model predictivecontrol to deal with the constraint and non-matching interference.

A two-level hierarchical communication architecture for segmented material conveyors having separate motor zones for sensing and control is presented herein. The architecture utilizes peer-to-peer serial communications among a plurality of motor zones to coordinate the article handling actions of those zones. Specific communications connectivity and message content schemes are used to better provide ZPA functionality that is performed in prior art conveyors by discrete contact-logic single bit “look-ahead” wiring. Additional features of the present invention include variations on placements of one or more barcode, tag reader or article presence sensors; a variable speed ZPA scheme; and a token-passing scheme for relaying pre-arranged article routing decisions among zone controllers.

The invention provides a cloud server storage integrity detection method and a detection system with high efficiency and capability of supporting data delete and user identity anonymity. Compared with a traditional cloud server, the cloud server supporting data delete provided by the invention can know identities of different users owning the same file, so that the cloud server can infer the attribution of the encrypted file according to the identities of the users. An authenticator required for auditing and generated by the user does not contain any information of the user identity. In addition, when the user downloads the file, the user only needs to send a legal certificate to the cloud server without the need for any identity information. In the whole scheme, the cloud server does not know any information of the user identities. In the method, the quantitative storage of the cloud server is realized.

The invention discloses a distributed model predictive control method based on hierarchical decomposition, comprising the following steps: for a distributed system, an adjacency matrix of the distributed system is acquired according to a communication network structure, and each subsystem is divided into a plurality of connected sets by the adjacency matrix by using an adjacent matrix based path search method; a reachable matrix of the connected sets is constructed, the level of each connected set is determined based on a hierarchical decomposition method in an interpretative modeling method, all the connected sets of the same level are combined into one connected set, and therefore, a connected-set set of a serial structure is constructed; and at each sampling moment, the optimal control input sequence of each subsystem in each connected set is solved in sequence according to the series order, and predictive control is performed on the distributed system. By using the method, communication between connected sets not correlated directly is avoided, the communication burden is reduced greatly while the system stability is ensured, and the problem that the traditional collaborative distributed model predictive control method is of high necessary communication burden is solved.

The invention discloses a real-time precise point positioning method based on the satellite clock and R-orbit error mixed estimation. A real-time satellite clock error estimation terminal and a mobile station client terminal are adopted. The method includes that the real-time satellite clock error estimation terminal estimates the satellite clock errors in real time through broadcast Ephesus and regional CORS continuous observation data and transmits to a mobile station through a mobile network rapidly; the mobile station client terminal receives GNSS observation data and acquires and decodes satellite clock error data through the mobile network, and the precise point positioning is performed after data p reprocessing. By the aid of the method, the positioning precision and convergence time of precise point positioning are improved and increased significantly on the basis of the IGS real-time data flow method, the small-scale CORS application is supported, and the limitation that satellite orbit determination requires a large range of ground stations is overcome; a user of the mobile station only receives the real-time satellite clock error correcting data instead of precise orbit data, and the network communication load is reduced.

The present invention discloses a linked storage fine-grained access control model based on attribute encryption and timestamp. The linked storage fine-grained access control model based on attribute encryption and timestamp of the present invention comprises a method of uploading data by a data owner, a user registration method, a process of establishing relationship among users, a user data access method and a user revocation method. The beneficial effects of the present invention are that: by the common effect of attribute and time, the linked storage fine-grained access control model is constructed, the fine-grained access control of users on the private data is realized, at the same time, the problem that the secret key amount hold by users in the actual application increases rapidly along with the overmuch encryption data types is solved, namely, users can decrypt a plurality of data blocks encrypted by different secret keys with the least secret keys, the situation that users only accept the requests of other users in the on-line state, and do not accept any requests in the off-line state is guaranteed, thereby reducing the communication burdens.

When first wireless communication is established, a mobile terminal sends image data specific information for specifying a set of image data to an image recording apparatus by the first wireless communication. When a set of image data associated with the image data specific information corresponding to the image data specific information received by the first wireless communication is stored, an image recording apparatus records an image corresponding to the stored set of image data onto a recording medium. When such a set of image data is not stored, the image recording apparatus receives the set of image data from the mobile terminal by the second wireless communication and records an image corresponding to the received set of image data onto the recording medium. The image recording apparatus then stores the received set of image data and the image data specific information in association with each other.

The invention relates to a spacecraft anti-interference attitude cooperative control method based on event-triggered communication. The method comprises the following steps: firstly, for a group of rigid spacecrafts which comprises a pilot spacecraft and a following spacecraft, describing an attitude kinematics equation and a kinetic equation of the following spacecraft by using modified Rodrige parameters (MRPs), and modeling unknown bounded interference of the spacecraft, the model being used for describing a plurality of actual interferences; secondly, designing a disturbance observer, estimating disturbance, and enabling a disturbance estimation error index to converge to zero; secondly, establishing a filter and introducing an event triggering mechanism to describe discontinuous communication between spacecrafts; and finally, designing a controller based on a backstepping method in combination with a disturbance observer and a filter to ensure that all closed-loop signals are consistent and bounded, and the attitude railing error can be converged into a residual set smaller than a predetermined threshold. According to the method, attitude cooperative railing of multiple spacecrafts under the condition of no continuous communication is ensured, and unknown interference can be compensated.

The present invention provides through associate response system realizing mobile terminal safety updating method and system, suitable for mobile communication field. Said associate response system at least includes terminal side located safety associate proxy, and network side located air interface safety associate proxy communicative safety associate server. Said method includes said safety associate server interacting with said safety associate proxy, controlling mobile terminal to make automatically safety updating; said automatically safety updating including automatically updating safety associate proxy and to make self-repairing to mobile terminal insecurity factor. The present invention can control mobile terminal completing automatically safety updating without user participation.