170results about How to "Synchronization speed is fast" patented technology

The invention discloses a security cloud storage system based on increment synchronization. A three-tier architecture of client-intermediate server-private cloud terminal is adopted, and data security is guaranteed by multiple security protection technology. After being blocked and encrypted, a user file is transmitted to a cloud terminal through an SSL (security socket layer) security transmission protocol; after finishing the work of user management and key management, the intermediate server terminal adopts a mutual authentication mechanism and an access control mechanism to realize the safe data share so as to completely prevent original data from leaking from the server terminal; the binding of the file and a mobile device is realized at a client, the specific file can be only opened on a specific device, and even though the file is leaked by an insider, a leaking device can be traced; moreover, the unique increment synchronization technology is realized, and the file can be synchronized by only synchronizing modified file blocks, so that the flow consumption in the file transmission process is reduced, the transmission efficiency is improved, the system usability is enhanced, and user experience is promoted.

The invention discloses a method for synchronizing multi-region data of a comprehensive monitoring system. The method is characterized by comprising the following steps: 1) synchronization region definition, in which, basic information of data servers of a control center, a spare center, a station and a rolling stock depot is defined; 2) cross-linking of ring queue and data service thread, in which, a thread corresponding to the data server is established, and is simultaneously cross linked with the ring queue so as to manage global state information; 3) data extraction and generation and encapsulation of identification information, in which, data to be synchronized is extracted, data description information is established, and the description information and the extracted data are encapsulated; 4) detection and management of server state, in which, the data synchronizing thread detects the state of the server, and updates state information corresponding to the data server in the global state information; 5) data submission and server failure processing; and 6) data submission result identification and data cleaning. The method for synchronizing data of the comprehensive monitoring system can realize high usability, high synchronization speed and high security of data synchronization.

The invention provides a class synchronization system based on the wireless network. The class synchronization system based on the wireless network comprises a wireless router, an all-in-one computer, a mobile terminal and a server side. The method adopted in the class synchronization system comprises the monitoring step, the judging step and the outputting step. In the monitoring step, the picture information of a brush panel of the mobile terminal is monitored in real time, and a picture synchronization order is sent to the server side to request for the synchronous displaying. In the judging step, whether the picture of the brush panel changes or not is judged, wherein if yes, a screen synchronization processor packages the coordinate pixel points and the corresponding color values of the changing parts in real time and transmits the coordinate pixel points and the corresponding color values of the changing parts to the server side to be processed, and synchronization picture information is generated. In the outputting step, the synchronization picture information is output to the all-in-one computer to be displayed. The screen picture of the mobile terminal can be synchronized to the all-in-one computer to be displayed in real time, the consumption on the CPU, the internal storage and the wireless network flow is reduced, the speed and running efficiency are high, and the synchronization picture is fluent.

The invention discloses a walking hydraulic control system comprising a reversible pump, a first left walking motor and a first right walking motor; the walking hydraulic control system further comprises a first flow split and flow collection valve, wherein a confluence oil opening of the first flow split and flow collection valve is communicated with a first working oil opening of the reversible pump, and two flow split oil openings of the first flow split and flow collection valve are respectively communicated with first working oil openings of the first left walking motor and the first right walking motor; and second working oil openings of the first left walking motor and the first right walking motor are communicated with a second working oil opening of the reversible pump. Compared with the prior art, the walking hydraulic control system is provided with the first flow split and flow collection valve to realize the equivalent flow split and equivalent flow collection of the walking motors on the left and right sides so as to improve the speed synchronism of the walking hydraulic motors and provide reliable guarantee for controlling the non-uniform friction of wheels. On the basis, the invention further provides self-walking type engineering machinery provided with the walking hydraulic control system.

A method and apparatus for synchronizing to a frame structure associated with base station transmissions in a radiocommunication system are described. A broadcast control channel can contain synchronization symbols within each of a plurality of timeslots. The symbols are organized in a sequence that is repeated each frame. Within each sequence are plurality of subsets of symbols which can be used to uniquely identify the phase of the frame.

The present invention relates to a single planetary gear hybrid power transmission system which comprises a single planetary row, wherein the single planetary row comprises three rotatable parts, namely, an outer gear ring, a sun gear and a planetary gear respectively meshed with the outer gear ring and the sun gear, and the planetary gear is connected to a planetary frame; a power supply, whereinthe power supply comprises an engine, a first motor and a second motor respectively connected to the single planetary row in a transmission manner, and a power storage battery for charging and powerutilization is mounted on the first motor and the second motor; a gear shift component, wherein the gear shift component comprises a gear shift element and a single-phase clutch or a brake for lockingthe transmission of the engine and the single planetary row; and an output shaft, wherein the output shaft is connected to the single planetary row in a transmission manner, and a main reducer is mounted on the output shaft. Compared with the prior art, the invention has the advantages of low mechanical complexity, low control difficulty, multiple modes and so on.

The invention discloses a method for synchronizing photos. The method includes the steps of uploading thumbnails of the photos to a cloud photo album server, synchronizing the thumbnails of the photos to a second terminal through the cloud photo album server, and uploading the photos to the cloud photo album server for saving. By means of the method, the shot high-quality photos are rapidly and synchronously displayed to other terminal devices through the cloud photo album server, and the downloading requirement of a user for the photos is met. The invention further discloses a device for achieving the method.

The invention discloses a ring network distributed bus protection synchronization method. The ring network distributed bus protection synchronization method includes the steps of sampling synchronization, constant value pressing plate synchronization and time synchronization. According to the sampling synchronization, fixed delay and measurement delay are adopted; the delay correction domain of sampling messages is corrected real time; and after obtaining sampling messages of all interval units, a ring network bus protection unit performs software interpolation synchronization through analyzing sampling delay in the delay correction domain. According to the constant value pressing plate synchronization, a source-end synchronous method is adopted; and a constant value pressing plate can be synchronized at any intervals of ring network bus protection. According to the time synchronization, a time synchronization method based on minimum addresses is adopted; and each interval of the ring network bus protection can still have very high timing precision under the situation in which an external time source is lost at an extreme end. The ring network distributed bus protection synchronization method of the invention is advantageous in easiness in implementation, no need for external synchronization sources and high synchronization precision.

A frame synchronization method of a GPS receiver comprises the following steps: (1) after the GPS receiver is turned on and is fixed firstly, the local clock is adjusted periodically to ensure that the times and variation periods of the local clock and the GPS clock are consistent, the current position of the GPS receiver is recorded; (2) after the channel of the GPS receiver is unlocked and recaptured, the local time and ephemeris are read, the preliminary position of the satellite is calculated according to the ephemeris and the approximate launch time of satellite signals; (3) the uncorrected approximate distance of the GPS receiver and the satellite is calculated according to the recorded initial position of the GPS receiver and the preliminary position of the satellite so as to obtain pseudorange; (4) the local time is corrected according to the time used for executing the step (2) and the step (3) to obtain the satellite launch time of the current teletext; and (5) the frame count, bit count and millisecond count of the current teletext are calculated according to the result of the step (4), and frame synchronization is performed to extract the teletext.

The invention discloses a data synchronization method, a server and a storage medium, which are suitable for terminal data synchronization. The method provided by the invention comprises the followingsteps: receiving an update request of a client; comparing a timestamp of the local data of the client with the timestamp of server data; when the timestamp of the local data of the client is different from the timestamp of the server data, obtaining fields of the to-be-updated data of the client according to the difference of the local data of the client and the server data, and splicing a SQL statement; and sending a set of the SQL statements to the client. In the data synchronization method, the o-be-updated data are spliced into the SQL statements on the server and are sent to the client,so that the client can directly execute the SQL statements and execute the data update operation in the server, thereby greatly improving the data synchronization speed of the client, and reducing thetraffic occupation.

The invention provides a method for synchronizing a radio navigation system of a direct sequence spread-spectrum and frequency hopping system, which comprises the steps that: an antenna (1) receives a radio signal and transmits the radio signal to a low-noise amplifier (2); the low-noise amplifier (2) performs low-noise amplification on the signal and transmits the amplified signal to a radio frequency processing module (3), the radio frequency processing module (3) performs filtering and automatic gain control (AGC) on the signal and then transmits the processed signal to a direct sequence spread-spectrum and frequency hopping synchronizing module (4); the direct sequence spread-spectrum and frequency hopping synchronizing module (4) realizes the synchronization of a frequency hopping sequence and a direct sequence spread-spectrum sequence; and a subsequent processing module (5) performs subsequent operations which are observed vector extraction, information demodulation and position resolution respectively according to synchronization information provided by the direct sequence spread-spectrum and frequency hopping module (4). The method effectively improves performance of capturing and tracking direct sequence spread-spectrum and frequency hopping signals, can quickly capture and stably track the direct sequence spread-spectrum sequence and the frequency hopping sequence which are relatively longer, and compared with the conventional method for synchronizing frequency hopping first and then synchronizing direct sequence spread-spectrum, is higher in synchronization speed, higher in synchronization accuracy and more ensured in privacy.

The invention relates to a network operating on a time triggered protocol using time slots, wherein at least two clusters are included in the network, each cluster includes at least a node. Further, it relates to a method for clock synchronization within a time triggered network. To provide a network and a method reducing the amount of time needed for aligning multiple communication clusters as much as possible it is proposed to provide a network operating on a time triggered protocol using time slots, wherein at least two clusters (A, B, X) are included in the network, each cluster (A, B, X) includes at least a node (11), wherein the node (11) includes a communication controller (15) having a node clock source (18) for determining a timing for the node (11), wherein the clusters (A, B, X) are connected to a coupling unit (10) having a clock alignment control logic (20) comprising a coupling unit clock source (21) which is more accurate than the node clock source (18), wherein the coupling unit clock source (21) is used for aligning the timing between the at least two clusters (A, B, X). Further it is proposed to provide a method for clock synchronization within a time triggered network using time slots, having at least two clusters (A, B, X), wherein each cluster includes at least one node (11), each node (11) comprises a node clock source (18) and a communication controller (15) and the clusters (A, B, X) are connected to a coupling unit (10) having a clock alignment control logic (20) comprising a coupling unit clock source (21) which is more accurate than the node clock source (18), the method comprising the steps of: monitoring the timing of the connected clusters (A, B, X) within the coupling unit (10); increasing or decreasing a cycle length of the timing within the clusters by use of the coupling unit clock source (21).

The invention discloses a database data synchronization method and device and a computer storage medium. Time stamps and version hash values are set for version information of databases of the Internet of Things terminal device and the cloud server. Only when the timestamps and the version hash values of the respective version information of the databases are consistent, synchronization of database is performed. The cloud server only sends different data between the data of the database corresponding to the latest update record of the cloud server and the data of the database of the version corresponding to the successful consistency check to the Internet of Things terminal device for synchronization. Through the scheme, data synchronization of the cloud server and the database of the Internet of Things terminal device can be ensured, and after consistency verification is successful, the cloud server only sends the difference data between the latest version of the database and the database when consistency verification is successful, so that the resource occupancy rate can be reduced, and the synchronization speed can be increased.

A multi-motor motion synchronization improved adjacent coupling control method based on active disturbance rejection comprises the steps of establishing a model of a permanent magnet synchronous motor system and initializing the system state and control parameters, designing an improved adjacent coupling control strategy, designing a multi-motor speed controller based on an active disturbance rejection technology, and designing a multi-motor synchronization controller by combining the improved adjacent coupling control strategy and an integral sliding mode technology. The speed consistency problem of a multi-motor synchronization system is solved effectively, the tracking performance and robustness of the system are improved, and stable operation of the multi-motor synchronization system is realized.

The invention provides a master-secondary synchronization method and device. The method comprises steps that data synchronization commands sent by a master node are received the first thread of secondary nodes, and log files are sequentially recorded according to the order of the data synchronization commands; the data synchronization commands are distributed by the first thread to multiple secondthreads of the secondary nodes and are simultaneously performed by the multiple second threads; if the data synchronization commands are successfully performed by the second threads, the confirmationinformation is sent to third threads of the secondary nodes; the offset amount of the log files is updated by the third threads according to the confirmation information. The master-secondary synchronization method is advantaged in that on the condition that the synchronization command input order of the secondary nodes and the command sending order of the master node are guaranteed to be consistent, the multiple second threads are opened and the data synchronization commands are simultaneously performed, the data synchronization speed is accelerated, master-secondary synchronization delay isshortened, and master-secondary data synchronization is efficiently accomplished.

The invention discloses a method for directly operating a file stored at a cloud end. The method comprises the following steps that a terminal device periodically obtains file structure indexing information of a file stored at a cloud end by a network and locally establishes a directory structure which is the same as the directory structure at the cloud end; when the file stored at the cloud end is to be operated locally at the terminal device according to the established directory structure, a file content request is sent to the cloud end, the file content sent by the cloud end is received and cached locally for operation; after operation, the terminal device records change of the file structure indexing information, caused by local operation, and sends the changed file structure indexing information to the cloud end; and the cloud end receives the changed file structure indexing information and synchronizes the file and the directory structure at the cloud end according to the information. The method disclosed by the invention provides convenience for operation of files stored at the cloud end and is high in synchronizing efficiency.

The invention provides a high frequency domain energy concentration synchronization method based on fractional Fourier transform. Three chirp signals are connected in series as a synchronization signal, and the synchronization signal is transmitted at a transmitting terminal; the transmitted synchronization signal is received at a receiving terminal, and the fractional Fourier transform in performed on the received synchronization signal to produce a fractional domain magnitude spectrum; three peak value positions of the fractional domain magnitude spectrum are detected, and the three peak value positions are compared with peak value positions in the case of without time offset and without frequency offset to produce an offset deviation; calculating time offset and frequency offset of the system according to the offset deviation; and adjusting a time window position of the system and the frequency of local carrier waves according to the time offset and the frequency offset of the system to realize synchronization. Aiming at low synchronization signal frequency domain energy concentration and susceptible system synchronization accuracy problems in synchronization methods adopted in modern frequency modulation communication systems, a synchronization method based on the fractional Fourier transform is provided. The method is applicable for synchronization of communication signals.

The invention relates to a cluster-based distributed antenna time frequency synchronizing method in wireless communication, and belongs to the technical field of wireless communication. The method comprises the following steps of: dividing mass distributed antennas into clusters, selecting cluster representative antennas, and performing distributed bidirectional coordinated synchronization on the cluster representative antennas; and then, initiating intra-cluster distributed bidirectional coordinated synchronization by the cluster representative antennas so as to finally realize time frequency synchronization of all distributed antennas in a system. The method has the following advantages that: through cluster division, a plurality of clusters are simultaneously synchronized, the total synchronization time is reduced and the synchronization speed is quickened; the synchronization between the cluster representative antennas is performed first and then the intra-cluster distributed bidirectional coordinated synchronization is performed so as to obtain higher synchronization precision and meet the requirement of a distributed wireless communication system for synchronization precision; and the synchronization between the distributed antennas is finished in advance so as to avoid multiple times of synchronization between a terminal user and a plurality of distributed antennas. The method reduces the system resource overhead of the terminal user, and improves the communication reliability.

The invention relates to a caller identification method and device. The method comprises the steps of submitting a local version number of a local address list to a background server by a mobile terminal, comparing the local version number with a latest remote version number of a remote address list by the background server; analyzing to obtain all operation records between a remote version number corresponding to the local version number and the latest remote version number and forming operation data by the background server; updating the data and the local version number of the local address list according to the operation data and the latest remote version number by the mobile terminal; monitoring communication state by the mobile terminal. According to the method and the device, a version number comparing mode is adopted, comparing all contact information in the address list is not needed each time, and the loads of the mobile terminal and the background server are reduced; only updated contact information is synchronized into the local address list, and incremental updating is realized, so that the synchronizing speed is improved.