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86results about How to "Achieving Clock Synchronization" patented technology
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Time synchronization method and system for multi-core system
ActiveCN101359238ARealize time synchronizationAchieving Clock SynchronizationResource allocationGenerating/distributing signalsTime deviationSlave clock
Owner:ZTE CORP
Clock synchronization method among wireless network devices
ActiveCN106131947AGuaranteed synchronizationEnsure consistencySynchronisation arrangementTime-division multiplexSynchronous controlInterconnection
The invention provides a clock synchronization method among wireless network devices. The method comprises the steps that 1, a clock source device and at least one clock slave device are in network interconnection; 2, the clock source device obtains a reference clock, and the clock slave devices obtain unsynchronized reference clocks; 3, the clock source device interacts clock information with the clock slave devices through clock synchronization frames; 4, the clock source device transmits information containing the frequency and phase of the reference clock to the clock slave devices; the CPU processors in the clock slave devices calculate the reference clock of the clock source device and calibrate own reference clocks according to the reference clock; and the clock synchronization among the wireless network devices is realized through the steps. The synchronized reference clock can be used for synchronous scheduling of CPU system tasks, synchronous control of performance of instructions, high-precision synchronous measurement of external signals and synchronous measurement of high-speed moving objects, basic wireless take scheduling can be satisfied, and the synchronous awakening tasks of the devices in an ultra low-power-consumption application can be satisfied.
Owner:潘进
Clock synchronization device for synchronous phase measuring in power system
InactiveCN101242231AReduce dependenceMeet the requirements of high-precision clock synchronizationBeacon systems using radio wavesTime-division multiplexTime informationReal-time clock
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.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Real-time communication and clock synchronization method of chain network
ActiveCN102332973AAvoid confictTroubleshoot clock synchronization issuesData switching networksSynchronising arrangementPath delayChain network
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.
Owner:SHANGHAI JIAO TONG UNIV
Clock synchronization method and base station
ActiveCN101668333AAchieving Clock SynchronizationLow costSynchronisation arrangementRadio transmission for post communicationGps receiverClock synchronization
The embodiment of the invention provides a clock synchronization method and a base station; the method comprises the following steps: the base station obtains clock synchronization information of theadjacent base station, the clock synchronization information comprises a synchronous state identification of the adjacent base station; the base station determines the synchronized adjacent base station according to the synchronous state identification of the adjacent base station; the base station chooses the adjacent base station used as a clock reference in the synchronized adjacent base stations; the base station carries out clock synchronization according to synchronization parameters of the adjacent base station used as the clock standard. By adopting the embodiment of the invention, thesynchronization parameters of the synchronized adjacent base stations can be used as a synchronization reference to carry out clock synchronization without allocating with a GPS receiver, the cost issaved and the reliability and the performance of the synchronization can be improved.
Owner:HUAWEI TECH CO LTD
Clock synchronization realization method for loop network
InactiveCN101170373AAchieving Clock SynchronizationTime-division multiplexComputer hardwareLoop network
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.
Owner:NO 3 AUTOMATION INSTR & METERS FACTORY SHANGHAI AUTOMATION INSTR & METERS CO LTD
High-precision GPS (global position system) distributive time-service method based on ping-pong buffer and message mechanism
InactiveCN103076737AAchieving Clock SynchronizationDoes not affect time synchronization accuracyTime-division multiplexRadio-controlled time-piecesVIT signalsSatellite
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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method and device for time synchronization in a tdma multi-hop wireless network
InactiveCN101616479AHigh precisionAchieving Clock SynchronizationSynchronisation arrangementAssess restrictionTime division multiple accessConflict free
Owner:INTERDIGITAL CE PATENT HLDG
Method, device and system for realizing clock synchronization
InactiveCN101771528AAchieving Clock SynchronizationImprove time synchronization qualityError prevention/detection by using return channelTime-division multiplexClock synchronizationClock control
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.
Owner:HUAWEI TECH CO LTD
Clock synchronization processing method, device and communication system
ActiveCN102761951AAchieving Clock SynchronizationSynchronisation arrangementTime informationCommunications system
The invention provides a clock synchronization processing method, a device and a communication system. The processing method comprises the steps as follows: acquiring the system day time information; generating the air interface day time information corresponding to a specific system frame according to the system day time information and the specific system frame information; wherein the air interface day time information corresponding to the specific system frame is used for delivering the system day time information between a long-term evolution return base station and long-term evolution return user equipment; and sending the air interface information containing the air interface day time information corresponding to the specific system frame to the long-term evolution return user equipment. The invention provides a corresponding device and a communication system comprising device. On the basis of the technical scheme provided by the invention, the system time information with high precision can be provided for a remote base station by using the LTE (Long Term Evolution) as the return of the base station, thereby realizing clock synchronization.
Owner:HONOR DEVICE CO LTD
Clock synchronization method based on PTP (Precision Time Protocol) and reflective memory network
ActiveCN103248471AAchieving Clock SynchronizationSynchronising arrangementSlave clockReflective memory
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.
Owner:北京飞秒留声科技有限公司
Alternating current charging pile based on satellite navigation system
InactiveCN102013719AEfficient managementAchieving Clock SynchronizationBatteries circuit arrangementsNavigation instrumentsTime-sharingElectric vehicle
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.
Owner:CHONGQING ELECTRIC POWER RES INST
Clock synchronization method, system and optical transmission equipment
ActiveCN108880722AAccurate implementation of clock synchronizationAchieving Clock SynchronizationWavelength-division multiplex systemsTime-division multiplexTime informationComputer science
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.
Owner:SHENZHEN ZHONGXING SOFTWARE CO LTD
Network clock synchronous method, device and system
InactiveCN101136738AAchieving Clock SynchronizationSmall clock skewNetworks interconnectionSynchronising arrangementDistributed computingNetwork clock
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.
Owner:SUPCON GRP +1
High-reliability clock synchronization system and method for time sensitive network
ActiveCN111585683AReduce dependenceImprove fault toleranceTime-division multiplexFault toleranceNetwork clock
The invention discloses a high-reliability clock synchronization system and method for a time sensitive network, and relates to the technical field of communication. The network is divided into two levels according to a clock synchronization function, a master-slave synchronization method is adopted for a top-layer network to achieve time and frequency offset correction, the time and frequency offset is compared with a bottom-layer network clock reference in order that the network reliability is guaranteed; and the bottom-layer network adopts a distributed structure to realize calculation release and frequency release of the time reference. According to the invention, the dependence of the network clock reference on the GM is reduced, and the fault tolerance and reliability are improved; roles of all devices in the network are dynamically distributed so that the agglomeration phenomenon is avoided, and clock synchronization of all network devices is achieved; time and frequency offsetcorrection is considered at the same time, synchronization of a network system clock and UTC in time and frequency is achieved, the problems that in a traditional clock synchronization method, time offset correction precision is not high, and frequency offset correction is slow are effectively solved, namely synchronization precision is improved, and synchronization speed is increased.
Owner:SHANGHAI JIAO TONG UNIV
Method and device for performing clock synchronization between equipment
InactiveCN101848051AAchieving Clock SynchronizationHigh precisionTime-division multiplexData switching networksNetwork clockTime delays
The invention discloses a method for performing clock synchronization between equipment, which comprises the steps of: A, performing coarse synchronization on clocks between a home terminal and an opposite terminal by using a network timing protocol; B, initiating bidirectional network time delay measurement by the home terminal, and acquiring TxTimeStampb, RxTimeb and Single-Delay; C, repeating the step B for multiple times, and calculating the mean value of the TxTimeStampb, the mean value of the RxTimeb and average time delay of a unidirectional frame; D, calculating a time correction value; and E, correcting the local current time according to the time correction value. The invention also discloses a device for performing clock synchronization between equipment. The time delay between the equipment through TWO-DM function is calculated for multiple times, so the average time delay of the unidirectional frame between the equipment is acquired; and the local current time is corrected through the local current time of the equipment and the average time delay of the unidirectional frame. Therefore, the clock synchronization between the equipment is realized. The clock synchronization has high accuracy up to nanosecond scale.
Owner:ZTE CORP
Clock synchronization method, time reference source device and clock recurrence equipment
InactiveCN108882356AAchieving Clock SynchronizationSynchronisation arrangementTime-division multiplexTime deviationClock correction
The invention discloses a clock synchronization method, a time reference source device and clock recurrence equipment. The method comprises the steps that a first network element determines time deviation correction information according to respective network element clock corrections, specific to a predetermined satellite, of the first network element and a second network element and the time deviation correction information is sent to the second network element, so as to synchronize a clock of the second network element. The method disclosed by the invention has the advantages that the firstnetwork element is taken as the time reference source device and determines the time deviation correction information according to the respective network element clock corrections, specific to the predetermined satellite, of the first network element and the second network element, thus the clock of the second network element can be corrected according to the clock correction obtained through calculation; and the clock correction is calculated by monitoring the same satellite, thus clock synchronization between the network elements is accurately and rapidly realized, and the problems in the prior art are solved.
Owner:SHENZHEN ZHONGXING SOFTWARE CO LTD
Clock synchronization method and device as well as cascaded base station system
InactiveCN105682215ANo topology changesReduce loadSynchronisation arrangementClock synchronizationReal-time computing
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.
Owner:ZTE CORP
Clock synchronization method and system in 1588-2008 protocol
InactiveCN103051406AAchieving Clock SynchronizationTime-division multiplexComputer hardwareSlave clock
The invention discloses a clock synchronization method and a system in a 1588-2008 protocol. The method comprises the following steps that when a signalling message negotiation mechanism is not initiated by means of a unicast communication mode, a slave clock device receives a PTP (precision time protocol) message sent from a master clock device, acquires a message average interval field value in the PTP message, detects the state of a clock link between the slave clock device and the master clock device according to the actual interval of the PTP message, initiates a synchronization operation according to the clock link state to obtain synchronization information, and adjusts the local clock of the slave clock device according to the synchronization information. According to the invention, the slave clock device can precisely acquire the value of the average message interval field when a master clock device sends each message, precisely acquires the interval at which the master clock device sends PTP messages, completes the adjustment of the local clock according to the obtained average message interval field value, and finally realizes the effect of clock synchronization between the local clock of the slave clock device and the clock of the opposite clock of the master clock device.
Owner:ZTE CORP
Textile industrial ethernet monitoring system and method thereof
ActiveCN102684943ASeamless connectionImplement filteringData switching by path configurationArea networkHuman–machine interface
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.
Owner:BEIJING JINGWEI TEXTILE MACHINERY NEW TECH
Clock synchronization method and system
ActiveCN106130710AAchieving Clock SynchronizationSynchronisation error correctionSoftware define networkFrequency offset
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.
Owner:KYLAND TECH CO LTD
Method and system for realizing clock synchronization
ActiveCN102624512ASolve the phase identification problemAchieving Clock SynchronizationSynchronisation arrangementSynchronising arrangementAir interfaceGlobal Positioning System
The invention discloses a method and a system for realizing clock synchronization. A received 1pulse per second (PPS) clock can be used for reference, phase discrimination is conducted by aiming at the 1PPS clock and air interface frame rates recovered by and a radio remote unit (RRU), and a phase discrimination result is obtained; the phase discrimination result is sent to a base band Unit (BBU); and the BBU conducts genlock according to the phase discrimination result. By adopting the method for realizing clock synchronization, the phase discrimination problem of a remote global positioning system (GPS) is solved, and clock synchronization is realized.
Owner:ZTE CORP
Method for implementing time calibration
ActiveCN104506268AAchieving Clock SynchronizationImprove calibration accuracyTime-division multiplexSynchronising arrangementStandard timeTransmission delay
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.
Owner:FEITIAN TECHNOLOGIES
Clock synchronization method and stack controller in switch stack system
ActiveCN102263633AAchieving Clock SynchronizationMeet the needs of mobile backhaul clock synchronizationTime-division multiplexData switching networksSource-synchronousSystem controller
The present invention provides a clock synchronization method in a switch stacking system. The method includes: determining a switch used for clock synchronization, and using the switch as a synchronization clock source; and using the synchronization clock source as a reference, sequentially configuring the clock synchronization of each switch. stack port, so that the clock of the synchronization clock source is synchronized to each switch in the stack system; the synchronization clock source synchronizes the clock to each switch in the stack system according to the configured stack port. The invention also discloses a stacking controller in a switch stacking system. By applying the clock synchronization method and the stacking controller of the invention, the clock synchronization inside the switch stacking system can be effectively realized, so that the switch stacking system can meet the requirements of mobile Returns the need for clock synchronization.
Owner:XINHUASAN INFORMATION TECH CO LTD
Cross-domain clock synchronization method and system based on PTP (Precision Time Protocol)
ActiveCN102904662AGuaranteed uptimeAchieving Clock SynchronizationTime-division multiplexReal-time computingPrecision Time Protocol
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.
Owner:KYLAND TECH CO LTD
Clock synchronization method and system of satellite communication-based base station
ActiveCN101860392AAchieving Clock SynchronizationRadio transmission for post communicationSynchronising arrangementSatelliteClock synchronization
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.
Owner:CHINA MOBILE COMM GRP CO LTD
Real-time clock synchronization circuit of battery management system and method thereof
ActiveCN104410400ANo need to consider hidden dangersMeet quality requirementsLogic circuitsCommunication interfaceElectrical battery
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.
Owner:HUIZHOU EPOWER ELECTRONICS
Clock synchronization implementation method of wind tunnel pressure measurement system
ActiveCN114785445AAchieving Clock SynchronizationMeet confidentiality requirementsAerodynamic testingTime-division multiplexSlave clockData acquisition
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.
Owner:LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
Binocular video synchronous acquisition equipment
InactiveCN101790106AAchieving Clock SynchronizationAchieve seamless buffer storageSteroscopic systemsProgrammable logic deviceEngineering
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.
Owner:SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
Coal mine power grid line impedance estimation system and working method thereof
ActiveCN104198816AHigh precisionFast precisionNon-electrical signal transmission systemsResistance/reactance/impedenceTopology informationPower grid
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.
Owner:TIANDI CHANGZHOU AUTOMATION +1
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