85results about How to "Achieving Clock Synchronization" patented technology

The invention discloses a clock synchronization device for measuring the synchronous phasor of an electric power system. Wherein, the local time synchronization module constitutes a synchronization time service network through connecting to the network protocol, an antenna and the GPS time receiver module receive the signal of the time information, the main module resolves the time information and resets the local real-time clock in the main module; the main module sends the time information to a second module through the network protocol and resets the local real-time clock in the second module, thus completes the time service of the local time synchronization modules in the main and second modules as the synchronization time service network. The clock synchronization device of the invention adopts a high-precision GPS time service mode and a low-cost main and second network time service mode, which satisfying the requirement of the high-precision clock synchronization in the measurement of the synchronous phasor in an electric power system, decreases the dependence on the GPS time receiving module when adopting the high-precision GPS time service mode in the entire network, and reduces the cost.

The invention discloses a real-time communication and clock synchronization method of a chain network, comprising the following steps that: A, a primary device enumerates and configures each slave device, starts a forwarding function of each slave device and forms an Ethernet chain network structure; B, the primary device and the slave device or the slave devices mutually exchange a delay request message and a delay response message to obtain related time stamps, and then, calculate a path delay between the current device and the next slave device and store the path delay in the current device; C, the primary device sends an initial deviation correcting signal message, each slave device orderly finishes initial deviation correction on a local clock after receiving the initial deviation correcting signal message; D, the primary device periodically communicates with each slave device in real time in a manner of collecting total frames, wherein a clock synchronization process is embedded in the real-time communication process. The method provided by the invention solves the real-time communication scheduling problem caused by combination of the real-time communication and the clock synchronization.

The invention relates to a method to realize clock synchronization in a ring network. Because what the equipment in the ring network realizes is a boundary clock, the ports thereof can have three status including a master clock, a slave clock and a passive clock, the ports in the status of the master clock are used as a base for the clock on the communication path thereof, and the ports connected therewith needs synchronizing therewith; the ports in the status of the slave clock needs synchronizing with the master clock on the communication path thereof; the ports in the status of the passive clock neglect the clock synchronization information thereon, each port on the communication path thereof conducts master clock competition, and generates three status including the master clock, the slave clock and the passive clock after competition, and therefore, the invention realizes the clock synchronization of equipment under the topological structure of the ring network.

The invention provides a high-precision GPS (global position system) distributive time-service method based on ping-pong buffer and a message mechanism. Clock synchronization among special equipment in a space remote control system is realized by a precise clock synchronization policy of hardware on time; and a GPS satellite synchronous clock serves as a clock source, and the time of each piece of special equipment is checked periodically by second pulse. Time information processing operation is completely finished in an FPGA (Field Programmable Gate Array), so that the time synchronization precision of the special equipment is not affected and the normal work of application programs of the special equipment is not intervened. A time-service time source also supports an IRIG-B (Inter Range Instrumentation Group) code time service, wherein the time frame speed of an IRIG-B type code is 1 frame/second, and 100-bit information can be transmitted. After a B type code is decoded, a 1c/s pulse signal, a 10c/s pulse signal, a 100c/s pulse signal. a 1,000c/s pulse signal, BCD (Binary-Coded Decimal) encoding time information and control function information can be acquired, and the synchronization precision can be up to dozens of nanosecond.

The embodiment of the invention discloses a method, a device and a system for realizing clock synchronization. The method for realizing the clock synchronization comprises the following steps: acquiring a time stamp group of terminals; selecting one time stamp to be used as a reference time stamp from the time stamp group and acquiring synchronous clock control information according to the reference time stamp; and transmitting the synchronous clock control information to each terminal, wherein the synchronous clock control information is provided for each terminal to perform time synchronization. The embodiment of the invention also discloses the device and the system for realizing the clock synchronization. The method, the device and the system are suitable for realizing the clock synchronization in IP communication network equipment.

A clock synchronization method based on a PTP (Precision Time Protocol) and a reflective memory network relates to the technical field of virtual simulation tests. According to the invention, the problem of the existing communication method that the clock synchronization precision is low due to unstable network can be solved, and the clock synchronization method based on the PTP and the reflective memory network is provided. The method is applicable to the clock synchronization between a host and node equipment in a virtual simulation experiment. A reflective memory card is inserted into each of the host and the node equipment respectively, and the data transmission is carried out by a fiber between the reflective memory cards in the host and the node equipment. The method comprises the following steps: a main clock and a slave clock are constructed; an offset correction phase is carried out; the offset correction is repeated; an offset value is obtained by a data processing algorithm; an optimal fitting value is obtained; a delay correction phase is carried out; the relay correction is repeated; a delay value is obtained by the data processing algorithm; and an optimal fitting value is obtained to complete the synchronization of the main clock and the slave clock. The method is suitable for virtual simulation tests.

The invention discloses an alternating current charging pile comprising a touch display, a card reader, a metering unit, a self-checking state indication unit, a trigger switch, a main controller and a satellite navigation system. The satellite navigation system is arranged inside the charging pile; the communication connection between a ground control center and an electric vehicle can be established by the satellite navigation system; the alternating current charging pile can be effectively managed by a monitoring center through the satellite; the clock synchronization among various charging piles can be realized and the unified time-sharing valuation function can be achieved; and by using the positioning function of the satellite navigation system, the monitoring center can effectively grasp the position of each charging pile and inform of electric vehicles, so that the electric vehicles can quickly position the positions of the charging piles for charging.

The invention discloses a clock synchronization method and device. The method comprises the following steps: first equipment sends local clock information to second equipment through the overhead of FlexE, thereby enabling the second equipment to perform clock synchronization according to the local clock information of the first equipment. The first equipment sends the local clock information to the second equipment through the overhead of the FlexE, thereby enabling the second equipment to perform clock synchronization according to the local clock information of the first equipment, and the transmission of the time information message is accomplished through the overhead frame sending, the transmission process is free from the influence of different optical fiber lengths, and the clock synchronization can be accurately realized, and the following problems in the prior art are solved: the link delay can change continuously since the optical fiber lengths of several lines correspondingto the flexE interface are different in the time information transmission, the larger the optical fiber difference is, the larger the jiggering of the clock synchronization is, and the clock synchronization cannot be realized.

The method includes steps: receiving clock synchronization (CS) message including synchronizing time (CT) sent from the objective network; converting CS message to format of CS protocol adopted by network device; sending the format converted CS message including CT to network device to implement CS between the network device and the objective network. The method can realize CS among networks when interconnected networks use different CS protocols. Correspondingly, the invention also discloses devices and system for CS of network.

The invention discloses a clock synchronization method and device as well as a cascaded base station system. A first-type base station obtains first clock synchronization information from an external clock source; a local clock is adjusted according to the first clock synchronization information, and second clock synchronization information is transmitted to another base station in a preset manner, wherein the second clock synchronization information comprises the first clock synchronization information or is generated according to the first clock synchronization information. A second-type base station obtains second clock synchronization information from at least one external base station; second clock synchronization information as a clock reference is determined from each second clock synchronization information according to a preset manner; the local clock is adjusted according to the second clock synchronization information as the clock reference. By adopting the technical scheme provided by the invention, the clock synchronization information is transmitted depending on links among base stations, so that sharing of the clock synchronization information among the base stations is achieved, and clock synchronization of multiple base stations is implemented finally; compared with the prior art, the invention has the advantage that a GPS does not need to be mounted on each site, so that the costs are reduced.

The invention provides a textile industrial ethernet monitoring system and a monitoring method of the textile industrial ethernet monitoring system, which can realize interconversion of multiple protocols to monitor the site of the whole textile industry. The textile industrial ethernet monitoring system comprises a data collecting control server which is used for sending data, collecting orders and receiving, analyzing, storing and displaying equipment information; the data collecting control server is connected with at least one monitoring module through an optical fiber ring network; and each monitoring module comprises a control module and also comprises an interactive module, a power supply module, a document storage module, a data storage module, a real-time clock, a reset circuit and a network port chip which are connected with the control module. The textile industrial ethernet monitoring system and the monitoring method of the textile industrial ethernet monitoring system are compatible with most types of PLCs (programmable logic controller) and human-computer interfaces used on textile equipment and realize the interconvention among an RS485 protocol, a CAN (controller area network) protocol and an Ethernet protocol, so as to realize seamless connection between Ethernet and a site bus.

The embodiment of the invention discloses a clock synchronization method and system. The clock synchronization method comprises the following steps that: a controller acquires clock information transmitted by a switch in an SDN (Software Defined Network), determines a master clock according to the clock information, generates a synchronization file, and instructs a master switch corresponding to the master clock to send a synchronization message to a first switch; the master switch sends the synchronization message to first switch; the first switch sends the synchronization message and receiving time to the controller; the controller resolves the synchronization message to obtain transmission time, acquires link delay between the first switch and the master switch, calculates a phase offset according to the transmission time, the receiving time and the link delay, calculates a frequency offset according to the transmission time and the receiving time, transmits the phase offset and the frequency offset to the first switch, and instructs the first switch to forward the synchronization message to one of other first switches in the SDN; and the first switches receive the phase offset and the frequency offset, perform clock synchronization, and forward the synchronization message. Through adoption of the clock synchronization method and system, synchronization of an SDN clock can be realized.

The invention discloses a method for implementing time calibration. The method for implementing time calibration comprises the following steps that a device to be calibrated generates a calibration time request message according to request message transmitting time, transmits the calibration time request message to a standard time device, and records the request message transmitting time; the device to be calibrated receives a respond message returned by the standard time device, records respond message receiving time, analyzes the respond message to obtain request message receiving time and respond message transmitting time, and obtains time difference and message transmission delay between the device to be calibrated and the standard time device according to the request message transmitting time, the respond message receiving time, the request message receiving time and the respond message transmitting time; the device to be calibrated calibrates a clock arranged inside the device to be calibrated according to the time difference and the message transmission delay between the device to be calibrated and the standard time device. According to the method for implementing time calibration, the device to be calibrated is calibrated by using network standard time, so that clock synchronization of the device in a network can be implemented quickly, and meanwhile, a relatively high calibration precision can also be ensured.

The invention relates to a cross-domain clock synchronization method and system based on a PTP (Precision Time Protocol). The method comprises the steps of judging whether a master clock in the local setting domain loses or not when clock synchronization is carried out by a switchboard according to a set period, judging whether the master clock is connected with other domains or not when the master clock in the local setting domain is determined to be lost; selecting one domain in the stored domains when the master clock is connected with other domains; synchronizing the local clock according to the clock information of the selected domain; and sending the synchronized local clock information. When the master clock in the local setting domain is lost, the local clock information is altered by selecting the clock information of other domains and storing the clock information of other domains so as to realize the clock synchronization of the local setting domain and ensure stable operation of the network.

The invention discloses a clock synchronization method of a satellite communication-based base station. The method comprises the following steps: very small aperture terminal (VSAT) main station of a very small aperture satellite terminal station based on IP technology receives a clock signal from a base station controller (BSC) and transmits the clock signal to a VSAT end station through satellite communication; and the VSAT end station receives the clock signal, sends the clock signal to a base station and indicates the base station to use the clock signal as the reference clock signal. By using the method, clock synchronization of the base station and the BSC can be ensured without adopting a GPS receiver. The invention also discloses a clock synchronization system of the satellite communication-based base station.

The invention discloses a real-time clock synchronization circuit of a battery management system and a method thereof. The real-time clock synchronization circuit comprises a battery management module, a main controller module and an external communication interface module, wherein the battery management module, the main controller module and the external communication interface module are connected in sequence through buses; the battery management module is used for carrying out unified control and management on multiple strings of batteries in a battery pack; the main controller module is used for controlling and managing an integral clock monitoring circuit; and the external communication interface module is used for providing an information interaction channel for carrying out time synchronization with external equipment. According to the real-time clock synchronization circuit of the battery management system, which is provided by the invention, additional arrangement of an onboard battery for power supply of a clock chip is not needed and the clock chip is arranged in a distributed manner, so that the accuracy for timing of the clock chip and the clock self-synchronizing alignment function are improved.

The invention relates to the technical field of wind tunnel pressure measurement, and discloses a clock synchronization implementation method for a wind tunnel pressure measurement system, and the method comprises the steps: taking the time of a data collection server in the wind tunnel pressure measurement system as the reference time as a master clock, and taking the time of a plurality of upper computers and a plurality of digital pressure measurement modules in the wind tunnel pressure measurement system as slave clocks; the data acquisition server synchronizes the upper computer based on an NTP protocol; the upper computer carries out soft synchronization on the digital pressure measuring module in a mode of broadcasting a command message. In this way, aiming at the current situation that networking or satellite coverage master clocks cannot be added on a wind tunnel site, the NTP protocol and a software synchronization mechanism are combined, synchronization of all equipment clocks of a wind tunnel pressure measuring system and clocks of a data acquisition server can be achieved, and the requirement for data confidentiality is met.

The invention relates to binocular video synchronous acquisition equipment. The conventional multi-channel video acquisition module adopts a time-sharing acquisition way and cannot really realize double-channel video synchronous acquisition. The binocular video synchronous acquisition equipment comprises a clock synchronous circuit, a first video decoding circuit, a second video decoding circuit, a programmable logic device, a first memory buffer circuit and a second memory buffer circuit, wherein the first video decoding circuit is in signal connection with a first input end of the programmable logic device and the second video decoding circuit is in signal connection with a second input end of the programmable logic device; the clock synchronous circuit is in signal connection with the first video decoding circuit and the second video decoding circuit respectively and provides clock signals for the first video decoding circuit and the second video decoding circuit; and the first output end of the programmable logic device is in signal connection with the first memory buffer circuit and the second output end of the programmable logic device is in signal connection with the second memory buffer circuit. The binocular video synchronous acquisition equipment realizes clock synchronization of two channels of video decoding chips and seamless buffer storage of the two channels of video data.

The invention provides a coal mine power grid line impedance estimation system. The coal mine power grid line impedance estimation system comprises a signal collecting device, a looped network access device, a network topology generating device, a data validity verification device and an impedance estimation device, wherein the signal collecting device is used for synchronously collecting and processing voltage and current signals of a coal mine power grid explosive-proof switch which is connected with the signal collecting device, the looped network access device is used for connecting the signal collecting device with the data validity verification device through an optical fiber Ethernet loop network, the network topology generating device is used for generating network topology information, the data validity verification device is used for performing synchronism and reasonability processing on collected data, and the impedance estimation device is used for estimating verified data by combination with the network topology information so as to figure out impedance of each line of a coal mine power grid. The working method mainly includes system synchronization timing, signal collection, validity judgment, impedance estimation and the like. By means of the coal mine power grid line impedance estimation system and the working method thereof, the credibility of estimation results of line impedance of the coal mine power grid can be improved, and scientific and reasonable supporting data can be provided for setting calculation of short-circuit protection in coal mine relay protection.