133results about How to "Shorten initialization time" patented technology

Provided are a method and apparatus for using a synchronous sensor network medium access control (MAC) protocol such as a ZigBee or IEEE 802.15.4 low-rate wireless personal area network (WPAN). Also provided are a method and apparatus for constructing a ubiquitous sensor network (USN) of which a life is increased by using power beacons and reducing the number of unnecessary control packets (beacon packets), thereby reducing an initialization time between nodes and preventing beacon collision. According to the present invention, a beacon packet channel having a large output power and a data channel of which a transmission range is restricted by reducing an output power to be less than that of the beacon packet channel, may be simultaneously used.

The invention relates to a GPS, GLONASS and BDS unified solution positioning method. The method includes the steps of conducting static relative positioning based on GPS, GLONASS and BDS three-satellite unified solution, and conducting dynamic relative positioning based on GPS, GLONASS and BDS three-satellite unified solution. By means of the GPS, GLONASS and BDS unified solution positioning method, solution is achieved through three-satellite unification, positioning accuracy and positioning reliability under the severe observation environment are improved, and initialization time is shortened; the partial ambiguity fixing strategies, namely, the partial ambiguity fixing method oriented to statistic relative positioning and based on the RMS and the partial ambiguity fixing method oriented to dynamic relative positioning and based on the coordinated factor matrix, are adopted, and therefore the success rate of ambiguity fixing can be increased, and accuracy and reliability of baseline solution can be improved; a unified observation model is set up, the method can be easily expanded and used, and the method has a wider application range.

Disclosed is a context modeller (103) used in decoding data (202) encoded using Context Adaptive Binary Arithmetic Coding, said context modeler (103) comprising a Read Only Memory (1001) for storing uninitialized context model values, said uninitialized context model values being stored in the Read Only Memory (1001) in a manner that enables a plurality of uninitialized context model values to be read from the Read Only Memory (1001) in a single clock cycle, an Arithmetic Logic Module (1003) comprising a plurality of parallel processing paths (2202-2207), each said processing path comprising a plurality of pipeline stages, a Random Access Memory (1005) and a memory controller (1008) for determining, using the Arithmetic Logic Module (1005) operating on said plurality of uninitialized context model values read from the Read Only Memory (1001) in each clock cycle, initialized context model values for storage in the Random Access Memory (1001) based upon header information in said incoming encoded data (202).

The invention discloses a Beidou tri-band network RTK ambiguity single epoch fixing method accompanied by wide-lane constraint. The method comprises steps of utilizing a combined single epoch of a carrier wave and a pseudo range to resolve two super-wide-lane ambiguity values of whole cycles of Beidou, performing simultaneity on two equations free of ionized layer combination and two equations free of geometric combination, and resolving three ambiguity parameters through third-kind six equations. By reasonably weighing the third-kind equations, Beidou tri-band basic ambiguity N1, N2 and N3 can be resolved in a single epoch mode. By means of the method, accuracy and efficiency on fast resolving of Beidou ambiguity are increased remarkably.

The invention discloses a GNSS (Global Navigation Satellite System)-based Kalman relative positioning method. The method comprises steps: 1, a double difference carrier phase is built; 2, relative positioning of a triple difference carrier phase is carried out; 3, a Kalman filter dynamic model is improved adaptively; 4, the Kalman filter state is updated; 5, satellite geometrical configuration changes are processed; 6, Kalman filter measurement is updated; 7, integer ambiguity is solved; and 8, relative position information is outputted. The method is better adaptive to relative positioning of a variably accelerated motion carrier, the precision of ambiguity floating point solution and the integer ambiguity fixing success rate are improved, the initialization time of a relative positioning system is shortened, and the real-time performance and the reliability of relative positioning are enhanced.

The invention discloses a monocular robustness visual-inertial tight coupling localization method which comprises the steps of: acquiring visual data by a camera, and acquiring inertial data by an IMU(Inertial Measurement Unit); carrying out IMU pre-integration and obtaining an IMU priori value; substituting the IMU priori value into a visual-inertial combined initialization model, and completinginitialization of a parameter; and in time required for initializing the parameter, calculating motion information by utilizing a transformation matrix among continuous key frames, and substituting the motion information into a rear-end module of a visual-inertial fused localization framework so as to implement tight coupling localization. After initialization of the parameter is completed, the parameter is substituted into the visual-inertial fused localization framework, and the motion information is calculated and is substituted into the rear-end module of the visual-inertial fused localization framework so as to implement tight coupling localization. By using the method disclosed by the invention, initialization time can be shortened to be within 10 seconds, and compared to localization accuracy of a conventional ORB_SLAM2 (ORB_ Simultaneous Localization and Mapping)-based monocular visual-inertial localization system, localization accuracy of the monocular robustness visual-inertial tight coupling localization method can be improved by about 30%.

The present invention provides a method and apparatus for a satellite navigation receiver to lock onto satellite signals in the cold start mode with no information on the receiver position, the satellite position, or time estimates stored in the receiver's memory. All satellites in a positioning system are divided into groups based on the satellite constellation structure. In an embodiment, the positioning system is the Global Positioning System (GPS) and all GPS satellites are divided into three groups. During initialization of the receiver, the satellites are searched per group to lock onto at least one satellite signal. Other satellites are then searched in a given order based on their respective distance or proximity to the first satellite acquired. This method reduces the Time-to-First-Fix (TTFF) ordinarily required by conventional receivers in the cold start mode.

A signal processing apparatus and a control method thereof are provided. The signal processing apparatus includes a signal receiver which receives a video signal; a video processor which processes the video signal received by the signal receiver; a display which displays the video signal processed by the video processor; a main controller which determines whether the signal processing apparatus is powered on and initializes the signal receiver and the video processor; and a sub controller which initializes the display while the main controller initializes at least one of the signal receiver and the video processor.

A device for image classification comprising a convolutional neural network configured to generate a plurality of probability values, each probability value being linked to a respective one of a plurality of predetermined classes and indicating the probability that the image or a pixel of the image is associated with the respective class, and the convolutional neural network comprises a plurality of convolutional blocks and each of the convolutional blocks comprises: a first convolutional layer configured to perform a pointwise convolution using a first kernel, a second convolutional layer configured to perform a depthwise convolution using a second kernel, wherein the second kernel has one of a single row and a single column, a third convolutional layer configured to perform a depthwise convolution using a third kernel, wherein the third kernel has a single column if the second kernel has a single row, and the third kernel has a single row if the second kernel has a single column, and a fourth convolutional layer configured to perform a convolution using a fourth kernel.

The invention is suitable for the technical fields of air conditioning and provides an air outgoing head shaking device of a wide-angle air conditioner. The device comprises a driving part controlled by a central controller of the air conditioner, a head shaking part driven to rotate by the driving part and provided with an air outlet, a photoelectric switch used for detecting whether the head shaking part is at an initial position or not, and an air outgoing fixed retaining block, and the photoelectric switch is electrically connected with the central controller; a blocking element driven to rotate by the head shaking part and used for blocking optical signal reflection of the photoelectric switch is arranged on the head shaking part, a Hall element capable of outputting pulse signals is arranged on the driving part, and an air outlet moving retaining block capable of rotating along with the head shaking part and used for being matched with the fixed retaining block is arranged on the head shaking part. Consequently, the problem of long initialization time of a conventional wide-angle air conditioner due to the fact that an air outlet or a swing fan blade of the conventional wide-angle air conditioner is large in rotating angle is solved, and running condition of the head shaking part can be monitored in real time. The invention further provides a wide-angle conditioner with the device.

The invention relates to a routing lookup method based on range of an IP address, which comprises the following steps: subsets of route prefix are divided by levels according to the inclusion relation of the route prefix in a routing table; specific lookup is carried out in the range of a determined subset of the next level of route prefix included in the upper level of route prefix according to the receiving destination IP address from high to low level by level until a corresponding subset of the next level of route prefix is empty and takes a next hop port corresponding to the route prefix determined at last as a lookup result. The method of the invention adopts level division and specific lookup level by level, only has the prefix information of the destination route and no pre-calculation, reduces the range of lookup space, can reduce the complexity of data space and lookup time and be good for the realization of the process.

An apparatus and a method for initializing data storage units of a volume or multiple volumes in parallel for data access as part of an initialization process. The method may include assigning initialization tasks for each of the data storage units to the multiple worker threads, and each of the worker threads independently performing each of the initialization tasks. The apparatus may include a processor and a memory storing instructions which configure the processor to initialize an initialization process to initialize the data storage units of a volume or of multiple volumes in parallel for data access.

A computer architecture with multiple operating systems (OS) using a common disc partition and a method for the same are proposed. The computer architecture includes: a first operating system having a file system used to store a second operating system; a random access memory (RAM) disc, wherein the RAM disc is a virtual storage device composed of partial memory of a memory unit and the second operating system can be executed in the RAM disc; and a basic input/output system (BIOS) used to control a booting procedure of a computer system and load the second operating system into the RAM disc. Therein, the second operating system can use parameter information and a multimedia playback system of the first operating system directly via an interface unit.

In a cognitive radio system, when communication in an operational channel is determined to be discontinued due to that an incumbent user (IU) entering the operational channel that is currently being used or due to that an excessive interference occurring in the operational channel, the operational channel is switched to a pre-arranged channel. However, since some parameters are different between the operational channel and the pre-arranged channel, an initialization procedure has to be performed to allow the cognitive radio system to be adapted to those some parameters. Since an initialization technique aiming for this situation is not developed yet, a conventional cognitive radio system uses a general initialization technique used to initially operate a system. However, the general initialization technique has to allow the system to be adapted to many parameters so that it takes a relatively long initialization time. A channel switching apparatus and method thereof of a base station, which allocates a slot for data exchange with each of a plurality of terminals in a frequency channel that is not used by the IU and thus performs communication, include transmitting a channel switching message for requesting to switch to a backup channel when a signal of the IU is sensed in the frequency channel; transmitting a beacon frame via the backup channel, wherein the beacon frame comprises allocation information about slots which are in the frequency channel and which are respectively allocated to each of the plurality of terminals; and allocating the slot for data exchange with each of the plurality of terminals to the backup channel according to the allocation information, and communicating with each of the plurality of terminals. By doing so, frequency resources between each of networks can be efficiently used, and convenience and efficiency with respect to network operation can be maximized.

The invention provides a visual inertial odometer method based on point-line initialization; the method comprises the following steps: step 1, collecting visual data through a camera, and collecting inertial data through an IMU; step 2, performing image feature extraction and tracking: extracting any two frames of images and tracking point features and line features to obtain a feature corresponding relationship between front and back frames; step 3, performing IMU pre-integration: carrying out pre-integration on all IMU data between any two frames of images to obtain an IMU prior value, and if IMU zero offset changes, recalculating an IMU pre-integration measurement value according to new zero offset; step 4, performing initialization: sending the features extracted and tracked in the step 2 and the IMU pre-integration value calculated in the step 3 into a visual inertia initialization model to obtain an initial parameter value; step 5, performing tight coupling visual inertial positioning: sending the initial parameters to a tight coupling visual inertial estimator to realize real-time positioning of the carrier; according to the method, the initialization success rate of the system in a texture-free environment is increased, and the initialization time is shortened.

The invention provides a GNSS double-frequency carrier phase integer ambiguity resolving method, and belongs to the technical field of satellite high-precision positioning. The method comprises the following steps that: after preprocessing a double-frequency carrier phase observation value. screening out an optimal carrier observed quantity to establish a double-difference geometric-free ionosphere-free observed quantity and a wide-lane carrier combined observed quantity; on the premise of estimating the wide lane ambiguity floating point solution precision and the single epoch wide lane ambiguity passing rate, searching fixed wide lane whole cycle ambiguity by using an LAMBDA method, estimating an ambiguity floating point solution of ionosphere-free combined observed quantity by using a Kalman filter, searching and fixing narrow lane whole cycle ambiguity by using the LAMBDA method, and finally performing back substitution solution on a positioning equation set to realize high-precision positioning and attitude solution of a satellite. According to the method, while the precision of the wide-lane ambiguity floating point solution is considered, the problem of low wide-lane ambiguity fixation rate is solved by utilizing an LAMBDA search algorithm, and meanwhile, the narrow-lane ambiguity floating point solution is well estimated, so that the overall fixation rate of a baselineis improved.

The invention discloses a wireless sensor network clustering routing method based on hexagonal regional division. The method comprises the following steps that six line segments (base lines) from a Sink node of a sensing area center divide a sensing area into six sector areas, wherein the included angle between every two adjacent base lines is 60 degrees; the sensing area is densely paved by hexagonal grids, a sensing node acquires longitude and latitude information by sensing self position information and calculates the distance between the position thereof and the closest base line, so that whether the hexagonal area where the sensing node is located is on the base line or not is judged, and if the hexagonal area is on the base line, after a clustering head is selected, the node that is selected to be the clustering head is changed into a gathering point; clustering head selection and data are transmitted by a multi-hop relay between the clustering head and the gathering point; the flow of the wireless sensing network from start to data acquisition is divided into a clustering head selecting and intra-cluster single-hop transmission process, and inter-cluster routing between the clustering head and the gathering point. The problem of too high energy consumption caused by too long transmission distance between clustering heads is solved, and the energy consumption during data acquisition of the network is greatly reduced.

The invention discloses a memory page active merging technology based sandbox concurrence method. The method comprises the steps of building a sandbox template in an initialized sandbox system and calibrating a basic memory page set; receiving a new task by the sandbox system, copying a virtual magnetic disk of the sandbox template to a new position, recording the position, and writing files and configuration of the new task into a new virtual magnetic disk; and generating a new sandbox based on the sandbox template, carrying out specific setting on the new sandbox, enabling the memory page set in the new sandbox to be in consistence with the basic memory page set of the sandbox template before the setting, and changing the memory page which requires change after the setting. The technical scheme can solve the technical problems that a portion with possibly little memory change of the operating system cannot be notified actively, resident sets of each sandbox system are reduced, and the memory utilization of the sandbox system cannot be optimized efficiently.

The invention discloses a method for rapidly initializing client communication of an IEC61850 intelligent device. The method comprises the following steps of: analyzing an scd file according to an IEC61850 standard through a guide library subsystem, processing a data object model of an intelligent device model, saving a data object type and a corresponding index to a client communication configuration file, reading the client communication configuration file through the client, establishing and saving a data structure of the data object through the client, finishing initialization of the data object until the processing of all data objects is finished, and finishing the initialization process of the client. Aiming at the problem that the conventional IEC61850 intelligent device client is low in initialization speed in the process of processing lots of data, the trouble that the model needs to be continuously modified and the client needs to be restarted in the processes of mounting and debugging the system, the problem that the data is lost caused by switching of the master and slave intelligent device clients due to various factors in the process of operating the system, and other problems caused by the reason that the restoration of intelligent device and client communication needs to be reinitialized are caused.

The invention discloses a wireless sensor network routing method based on an improved whale group algorithm. The method comprises the following steps: separately encoding sensor nodes in the network;collecting, by an aggregation node, the information of each sensor to form global information; performing routing calculation according to the global information to obtain an optimal forwarding path of each sensor; sending, by the sensor, a data packet containing the information to the aggregation node according to the optimal forwarding path in a routing table; and receiving, by the aggregation node, the data packet, obtaining the residual energy information of the node, and updating the global information. By adoption of the method in the technical scheme of the invention, the WSA is improved to solve the wireless sensor network routing problem via the excellent performance of multi-peak optimization. By mans of corresponding improvement of the whale group algorithm and the objective function model, the energy consumption of the path and the length of the path are considered, the energy efficiency is effectively improved, and the service life of the whole wireless sensor network is prolonged.

The present application provides a navigation augmentation method and system, the method includes: broadcasting, by satellites of a Low Earth Orbit (LEO) constellation, navigation direct signals and navigation augmentation information; performing, by a user receiver, precise positioning, speed measurement and timing according to the navigation direct signals of navigation satellites, the navigation direct signals of the LEO satellites and the navigation augmentation information broadcasted by the LEO satellites.

The invention belongs to the technical field of satellite navigation, in particular to a broadcasting method of a satellite real-time accurate positioning product. Satellite positioning information is separated into a large number and a small number according to the height above or below a hundred meter at a server end, and a client end recovers an identical accurate positioning product through the large number acquired from broadcast ephemeris and the small number transferred by the server. The invention can solve the problems of failure or reduced accuracy of a high-accuracy differential product, and the like caused by the inconsistence for upgrading the broadcasting ephemeris of the server and the client end and the inconsistence between a server and client end software algorithm module and a truncation error.

The invention discloses a control method of an Internet of Things chip based on a cellular technology, which comprises the following steps: when in a low power consumption mode, a wake-up circuit catches a wake-up event, the system hardware in a power-down state is awakened and enters a solidification start program; a system boot program is started in combination with a boot reason of the boot program, the system boot program analyzes the validity of a paging message corresponding to the wake-up event; When the paging message is a validity message, the system core software is started to process the paging message; When the paging message is an invalidation message, the system boot program re-enters a low power mode. After the invention captures the wake-up event, the system hardware is awakened, and the whole system is started only when it is confirmed that the paging message is valid to be processed. Compared with the traditional low power mode, it saves more power. So that pow consumption is greatly reduced.