50results about How to "Clock synchronization" patented technology

The invention provides a method and device for realizing a boundary clock in a cascade base station, which is used for solving the problem that non-last stage base stations support a BC mode in a clock multicasting mode when the base stations are cascaded in a packet transport network (PTN) network. The method for realizing a boundary clock in a cascade base station comprises the following steps: receiving synchronous messages from a superior clock device; acquiring delay information from a superior clock device to the clock device in the synchronous messages, and determining the clock signal of the clock device in accordance with the delay information and the clock signal of the superior clock device; and sending messages carrying the timestamp of the clock device to a subordinate clock device. In addition, the invention also provides a device for realizing a boundary clock in the cascade base station.

The invention provides an xDSL time synchronization method, device and system. The method comprises the following steps: a far-end sends a first symbol, a local end receives the first symbol, the far-end obtains the time for sending the first symbol and the time for receiving the first symbol; the local end sends a second symbol, the far-end receives the second symbol, the far-end obtains the time for sending the second symbol and the time for receiving the second symbol, when calculating the clock offset of the far-end and the local end, the far-end splits the delay of path from the local end to the far-end and the delay of path from the far-end to the local end, obtains the value of the known part, and uses the condition that the downlink delay is approximately equal to the uplink delay or the downlink delay is proportional to the uplink delay to calculate the clock offset of the far-end and the local end, and the far-end uses the offset to adjust the clock and realize synchronization. The method of the invention can accurately obtain the clock offset of the far-end and the local end and effectively realize the time synchronization of the far-end and the local end by adjusting the read clock time of the far-end and the read clock time of the local end.

The invention provides a three-phase voltage phase distinguishing method, wherein voltage collecting devices are installed on an A phrase, a B phrase, a C phrase at a head end of a power supply line on a low-voltage side of a distribution transformer, and electricity-tested places, sampling is conducted when voltages rise over a zero, the referenced moments when voltages of the A phrase, the B phrase and the C phrase rise over the zero are t1, t2 and t3, the referenced moment when a voltage of a phase distinguishing measurement point rises over the zero is ti, the number values of the moments which are over the zero are uploaded to a server and are compared, and when the ti is closest to one of the t1, the t2 or the t3, phrase of the phase distinguishing measurement point can be distinguished. Through the method, number of users and a three-phase power supply balance rate can be counted according to phrases, and a rate of electric energy loss can be counted in a split-phase mode.

A clock synchronization method provided by the present invention is applied to a cluster routing system, the cluster routing system comprises a main center frame router and two business frame routers, and the clock synchronization method comprises the following steps of using the main center frame router to set a clock source according to the configuration data inputted by users, wherein the clock source is the main center frame router or the business frame router; using the main center frame router to obtain the synchronous clock information preset in the clock source, wherein the synchronous clock information comprises the frequency synchronization information and the phase synchronization information; using the main center frame router to sent the synchronous clock information to the corresponding router according to the type of the clock source, so that the routers are in clock synchronization. The present invention also discloses the cluster routing system. According to the present invention, the working stability of the cluster routing system can be improved.

This invention provides one light network system without source based on Ethernet of TDM business, which comprises fiber branch connection light path terminal and light internet unit, wherein, the terminal and unit are set with TDM business adapter; the said terminal TDM business adapter adopts light network send clock to seal the TDM business data or analysis; the said light network unit TDM business adapter by use of light network receive clock for analysis or sealing.

The invention discloses a wireless Internet-of-Things-based override control obstacle avoidance intelligent vehicle and a control method therefor and belongs to the field of wireless Internet-of-Things. A state sensing module, a wireless Internet-of-Things module, a regulation and control module and an override control module are mounted on the obstacle avoidance intelligent vehicle; the obstacle avoidance intelligent vehicle is suitable for traffic conditions of a crossroad, and the obstacle avoidance intelligent vehicle is allowed to cross the crossroad in a conflict-free manner. Particularly, special conditions can be handled with smooth speed change via the override control module, and effects of timely advancing, smooth deceleration, smooth acceleration and smooth parking can be exerted; clock synchronization and dispatching synchronization of the obstacle avoidance intelligent vehicle in the Internet-of-Things are fulfilled, signal lagging of traffic dispatching and time constants of a traffic system can be greatly reduced, and simplified and unified management of a traffic system model can be facilitated.

The invention provides an intelligent wiring device and examination method for online test of a gateway electric energy metering device, and solves the problems that frequent opening (closing) of contacts of a conjunction box in a present gateway electric energy metering device causes no-voltage and shunting faults and influences the gateway metering accuracy, and manual test via multiple devicesin multiple points causes high workload, low efficiency and high safety risk.

The invention discloses an electric six-axis robot control system based on EtherCAT, and the system is characterized in that the system comprises a PC and a PLC master control system, the PC and the PLC system carry out data interaction through an ADS protocol, the PLC master control system comprises a PLC master station and a plurality of PLC slave stations, the PLC master station and the plurality of PLC slave stations carry out data interaction through the EtherCAT, and the PLC master station and the plurality of PLC slave stations are connected with the PLC master station. The PLC master station and the PLC slave station perform data interaction with the PC based on an ADS protocol; and the PLC slave station comprises a motion controller and a logic controller which respectively correspond to the joints of the six-axis robot. Data transmission between the PLC master station and the PLC slave station is realized by adopting an EtherCAT communication mode, and the data compatibility is good. A six-axis robot joint injection variable error analysis algorithm provides data reference for installation and debugging of robot joints and opening of a control algorithm. And the TwinCAT is used as a main control core, and a distributed clock technology is adopted to ensure clock synchronization among the EtherCAT slave station modules.

The embodiment of the invention provides a clock processing method, access network equipment and terminal equipment. The method comprises the following steps: determining a first timestamp when the terminal equipment sends a first signal; receiving a second signal which is sent by the terminal equipment and corresponds to the first signal, and determining a fourth timestamp when the second signalis received; and sending a data packet containing the first timestamp and the fourth timestamp to the terminal equipment, wherein the data packet is used for enabling the terminal equipment to adjusta local clock of the terminal equipment. The first timestamp and the fourth timestamp are sent to the terminal equipment at one time in a merged way, so that utilization rate of time frequency resource is improved, then the time frequency resource of a wireless network is more efficiently utilized, and clock synchronization is realized.

A non-transitory computer-readable medium stores instructions readable and executable by a workstation (18) including at least one electronic processor (20) to perform an acquisition and reconstruction method (30, 32). The method includes: acquiring emission imaging data using an emission image acquisition device (12) wherein the acquiring is scheduled to be performed over an acquisition time; during the acquiring, measuring a count or count rate of the acquired emission imaging data; during the acquiring, adjusting the acquisition time based on the measured count or count rate to generate anadjusted acquisition time; stopping the acquiring at the adjusted acquisition time; and reconstructing the emission imaging data acquired over the adjusted acquisition time to generate one or more reconstructed images.

The invention relates to a positioning base station clock synchronization device and a synchronization method thereof. In the positioning base station clock synchronization device, the GPS unit is used for positioning and outputting the first clock signal; the processing unit is used for receiving the first clock signal, the first clock signal is synchronized with the GPS unit clock, and outputs the second Clock signal; the positioning unit is used to receive the second clock signal, and the second clock signal is synchronized with the clock of the processing unit to realize the clock synchronization of the GPS unit and the positioning unit, and the clock precision is the same, then the positioning unit of each positioning unit of the positioning base station Clock synchronization, no longer relying on GPS positioning clocks to keep the clocks of positioning base stations synchronized as in the prior art, without using expensive PLL clock generation/distribution chips, which greatly reduces costs, and has a simple structure and accurate positioning.

The invention discloses an Ethercat bus master station and slave station real-time synchronization method, which comprises the following steps: setting a carrier period and a master station synchronization period, the ratio of the carrier period to the master station synchronization period being an integer N; when the synchronous interrupt program of the MCU slave station is finished, the SyncIO is set to be at a high level, and the SyncIO is an IO port, connected with the FPGA execution module, on the MCU slave station; when the sum of the times of triggering a second event and a fourth event is N, SyncIO is set to be low level, then the sum of the times of triggering the second event and the fourth event is reset, the second event is a sampling interruption triggering event, and the fourth event is a sampling interruption triggering event; and the state of the SyncIO is detected in real time, and when the rising edge of the SyncIO is detected, the FPGA execution module executes a synchronization algorithm. According to the invention, real-time synchronous control of the Ethercat master station, the MCU slave station and the FPGA execution module is realized.

The invention discloses a slot wave seismograph, and an underground clock calibration and time synchronization method thereof and belongs to the technical field of geophysical exploration. An acquisition system and a triggering system are included, wherein the acquisition system includes an acquisition host and a plurality of acquisition stations, the trigger system includes a trigger recorder andan exploder, the acquisition host is connected with an underground explosion-proof notebook computer, the acquisition stations are connected with one another through large wires and sensors, the acquisition host is connected with the trigger recorder through a cable, and the trigger recorder is connected with the exploder; and the acquisition host records acquired seismic waveform data, the trigger recorder records detonator detonation time, and the acquisition host communicates with the trigger recorder through the cable to complete clock calibration and clock synchronization.

The invention provides a timing device, a base station, a positioning system, a calibration method and a positioning method. The timing device comprises a processor and an ultra wide band UWB chip which are in communication connection. The UWB chip comprises a UWB clock, and the UWB clock crosses zero once every first preset time length; the processor comprises a timer, carries out zero-crossing detection on the UWB clock according to a second preset duration by the processor, and records the zero-crossing times of the UWB clock; the processor is used for obtaining the current time of the UWB chip, and obtaining the system time according to the current time, the zero-crossing frequency and the duration corresponding to each zero-crossing. According to the timing device provided by the embodiment of the invention, the precision of the timing device can be greatly improved, and in addition, the clock device can provide picosecond-level timing with atomic clock-like precision for a time-based positioning system. Based on the timing device, the invention provides a base station, a positioning system, a calibration method and a positioning method for realizing millimeter-scale positioning.

The invention discloses a clock processing device and a clock processing method for an OTN branch board card, and relates to the technical field of optical communication application. A Framer chip ofthe device comprises an SFP module and an 8K clock processing module connected with the SFP module. The 8K clock processing module can extract a clock from a client business end specified by the userto a clock unit of the system, and monitors a client business port in real time when the OTN branch board card is used as a clock source; once a fault alarm is monitored, an interruption level signalis output to an FPGA processing module, and meanwhile a clock source switching signal is sent to the clock unit of the system. After the FPGA processing module of the device receives the interruptionlevel signal, a clock extraction channel is closed, and after the clock unit of the system receives the clock source switching signal, the clock source is switched. According to the device and the method provided by the invention, the clock source can be timely switched when the clock source is failed or lost, and a response can be made within 1ms, and thus the TIE index requirement of the systemis met, and user experience is good.

The invention specifically provides a synchronous detection system for an intelligent transformer substation device. The problem that an existing transformer substation device is large in labor intensity, low in effect and free of detection result reliability is solved. The synchronous detection system for the intelligent transformer substation device comprises a satellite signal receiving device, a satellite signal demodulation unit, a clock synchronization adjustment device, an operation parameter acquisition device, a wireless communication unit, a detected device and a control room mainframe. The transmitting end of the satellite signal receiving device is connected with the receiving end of the satellite signal demodulation unit, the transmitting end of the satellite signal demodulation unit is connected with the receiving end of the clock synchronization adjustment device, the clock synchronization adjustment device is connected with the detected device, the output end of the detected device is connected with the input end of the operation parameter acquisition device, the output end of the operation parameter acquisition device is connected with the input end of the wireless communication unit, and the output end of the wireless communication unit is connected with the input end of the control room mainframe. The synchronous detection system for the intelligent transformer substation device ensures that a detection result is accurate and reliable.

The invention relates to the technical field of communication, and provides a base station synchronization method, a plurality of base stations share one fixed time service source, the time service level of the fixed time service source is 1, each base station is provided with an original time service level and a current time service level, the original time service level is unique, and the current time service level is unique. The initial value of the original time service level is equal to the initial value of the current time service level; when a fixed time service source works normally, base station synchronization is carried out according to the following method: when a first base station receives a data packet sent by the fixed time service source, clock synchronization of the first base station and the fixed time service source is executed, and the current time service level of the first base station is 2; the first base station is any base station in a plurality of base stations. Through the technical scheme, the problem of poor synchronization effect of the base station synchronization method in the prior art is solved.