58results about How to "Realize time synchronization" patented technology

The synchronization (sync) method includes steps: based on repetition characteristic at time domain of down going pilot frequency symbol (PFS) in DwPTS to carry out difference correlation for time domain sequence of received at least one sub frame length; based on peak value of difference correlation to carry out synchronous searching. The invention also discloses a method for searching sector primarily (SSP) including coarse time sync and coarse correction of frequency deviation based on sync channel; and fine correction of frequency deviation and fine procedure of time sync based on PFS of TS0 time slot. Aiming at requirement of broadband time division duplexing cellular system, the invention sets up down going PFS on down going sync channel SCH as repetition characteristic at time domain; based on the setting, the invention carries out time sync and SSP based on OFDM symbol so as to realize sync between UE and access system effectively, and complete SSP.

The invention discloses a microwave time synchronization method and a microwave time synchronization device. The method comprises the following steps that: when time synchronization operation is required by slave equipment and master equipment, the slave equipment inserts synchronization information into a time division multiplexer (TDM) data frame, and records a transmission time T1 of the TDM data frame; when detecting the TDM data frame with the synchronization information, the master equipment records a receiving time T2 of the TDM data frame; the master equipment inserts response information, T2 and a transmission time T3 of the response information into another TDM data frame, and transmits the another TDM data frame to the slave equipment; when detecting the TDM data frame with the response information, the slave equipment records a receiving time T4 of the another TDM data frame, and extracts T2 and T3; and the slave equipment calculates an offset value according to T1, T2, T3 and T4, and regulates the timestamp information of the slave equipment according to the offset value. The transmission and receiving time of the TDM data frames in the master equipment and the slave equipment is recorded to realize the time synchronization operation on microwave air interfaces between the master and slave equipment.

The present invention pertaining to the technical field of communication discloses a time synchronization method, a device and a system thereof. The method comprises the steps of receiving time synchronization signals which comprise data of pulses per second (1PPS) and absolute times; transmitting the time synchronization signals to a client through a wired medium for performing time synchronization. The device comprises a receiving module and a transmitting module. The system comprises a device for time synchronization and a client. Therefore, time synchronization can be realized by the connection of current wired mediums between base stations, and Mus level time synchronization between indoor base stations is solved without adding wiring.

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 discloses a method for realizing automatic time synchronization. Firstly, a sending end sends connection establishing request information which contains the information sending time. Secondly, a receiving end judges whether the time of the sending end and the time of the receiving end are synchronous according to the information sending time, when the time of the sending end and the time of the receiving end are not synchronous, the failed response information is returned to the sending end. Finally, the sending end synchronizes the information sending time with the time of the receiving end according to the receiving end time carried in the failed response information. The invention also discloses a system which can realize automatic time synchronization. The system includes a sending end and a receiving end. The sending end includes a connection processing unit and a time synchronizing unit; the receiving end includes a connection processing unit and a time synchronization judging unit. The invention realizes the automatic time synchronization of the sending end and the receiving end, and does not influence the data operation request of the user when the time is not synchronous.

The invention discloses a high-precision multimode low-voltage load power property recording instrument, which is low in cost and flexible in installation, is not confined to various measuring interfaces, and can realize networked synchronous precise time service, high measurement precision and three-mode transmission, and the working method thereof. The high-precision multimode low-voltage load power property recording instrument comprises a microprocessor unit, wherein the microprocessor unit acquires a power grid simulating signal from a low voltage side power grid through a signal regulation and analog-digital conversion processing unit, computes and analyses the voltage, the current, the frequency, the active power, the passive power and the power factor of a power grid low voltage side phasor signal, acquires a GPS (global positioning system) or a Beidou navigation signal through a double-mode time service unit to obtain time information, integrates the time information with the voltage, the current, the frequency, the active power, the passive power and the power factor which are computed out to obtain a time sequence power grid vector, and sends data to a server terminal through a three-mode data sending unit; and the microprocessor unit also acquires a power voltage from the low voltage side power grid through a power unit and is connected with a liquid crystal display unit and a control unit.

The invention discloses a multimedia file producing method which comprises the following steps: establishing the corresponding relationship between audio data stream position information of an audio and subtitle word information for synchronous display when playing the audio, saving the formed synchronous information, and obtaining and saving sound channel distribution information in audio information. The invention further discloses a multimedia file playing method, a multimedia file producing device and a player, and the invention can realize the synchronization of the audio and words all the time and facilitate the control of the audio output by establishing the synchronous information of the audio and the words and recording the sound channel distribution situation of the audio.

The invention discloses a system which can be used not only as a positioning signal emission source but also as positioning signal synchronization under the high dynamic environment. The system comprises main functional modules of at least a GPS/Northern Dipper/Galileo/GLONASS signal receiving unit, a positioning signal source signal emitting unit, a transceiving master control platform, reception control software and the like, and the main functional modules are integrated into a system unity of a multi-mode positioning signal source. The 1PPS of the receiving unit is prospectively integrated with the design of the positioning signal source, and the time synchronization problem of the multi-mode positioning signal source is solved in the system; in virtue of the transceiving master control platform, the current coordinate of the positioning signal source can be input in real time, and the signal can be launched or reflected by data processing. The system is a new method of the positioning signal source technology in the expanding research and system design in the space navigation positioning field.

The invention discloses a method and system for realizing SNTP client time synchronization. The method includes the following steps of determining whether the time synchronization channel of an SNTP client is a TR069 channel or VOIP channel, if no, the time synchronization is carried out by a default route, if yes, the DNS address of the WAN port of the time synchronization channel is acquired; adding a strategy route having the DNS address as the destination address into the routing table of the time synchronization channel; performing domain name resolution of the SNTP server through the strategy route; deleting the strategy route after the domain name resolution is completed; and constructing an NTP message, by which the SNTP client is in network communication with the IP address of the resolved SNTP server to realize the time synchronization of the SNTP client. The method and system are not influenced by network structure change and have no influence to user networking, the flexibility and the reliability are high, and the defects of time synchronization carried out by the default route and a conventional time synchronization mechanism are made up.

The invention discloses a dynamic compensation pulse circuit which comprises a signal generation module for generating a primary second pulse signal, a standard signal module for receiving a standardsecond pulse signal and capturing a rising edge time point of the standard second pulse signal; a processor for generating an updating storage value according to the rising edge time point of the standard second pulse signal; a signal adjusting module which is connected with the signal generating module and the processor and is used for receiving the updating storage value; wherein the signal adjusting module is started by the primary second pulse signal, and transmits the updating storage value to the signal generation module; and the signal generation module generates an update second pulsesignal according to the updating storage value. The method has the advantages and beneficial effects that the influence of channel transmission delay on time synchronization clock precision is eliminated, and the clock synchronization of the dynamic compensation pulse circuit and the standard time source is realized. The clock synchronization between the standard time source and the synchronized device is guaranteed, the structure is simple, and the cost is low.

The invention provides a non-intrusive time synchronization method and system and a storage medium, and the method comprises the following steps: 1, collecting a network packet from a mirror port of a switch, and filtering and screening out an IP network message containing time synchronization information from the collected network packet; 2, extracting a timestamp field from the IP network message; 3, calculating proofreading time based on the extracted timestamp field; 4, checking the time of the flow monitoring equipment by using the calculated checking time. According to the non-intrusive time synchronization method and the non-intrusive time synchronization system provided by the invention, the time correction of the flow monitoring equipment can be realized under the conditions that the original complex network topology structure is not adjusted and new time synchronization service equipment is not installed.

The invention discloses a time synchronization method, which comprises the steps of receiving the data sent from a time service system, recording a first time for receiving the data, acquiring a second time through parsing the data on the condition that the received data includes the time information and the time information is the system time of the time service system, calculating the time offset of a slave system relative to the time service system, calculating the time stamp of network data on the condition that the received data are just the network data, and adopting the time stamp as the system time of the slave system. According to the technical scheme of the invention, the time offset is the difference value between the first time and the second time and the time stamp is the sum value of the first time and the latest time offset obtained through calculation. Based on the above method, the time synchronization function for all slave systems of a simulation system is realized without the arrangement of any time synchronization apparatus. Meanwhile, the system is low in cost and the operation of the simulation person is simplified. The workload of the simulation person is lowered. The invention also discloses a time synchronization apparatus and a simulation system.

The invention provides a time synchronization method, relates to the field of communications, and solves the problem that an AFDX (Avionics Full Duplex Switched Ethernet) time synchronization machine is lacked. The time synchronization method comprises the following steps: a transceiving end receives a serial time code adopting the IRIG-B format; the serial time code is used as reference time, and time breakdown is performed to obtain time signals. The time synchronization method adopting the technical scheme is applicable to AFDX, and realizes the time synchronization based on IRIG-B.

The invention belongs to the technical field of virtual reality, particularly relates to an immersive virtual reality device and system and a control method, and aims at solving the problems that an existing virtual reality system is single in sensing information, inflexible in operation, poor in interactivity and poor in immersion. The immersive virtual reality device comprises a virtual movementdevice, a virtual reality display device, a virtual sensing device and a central control system, and specifically, a measured object moves on the virtual movement device, and a virtual reality imageis generated on the virtual reality display device in real time through a virtual scene model based on the detected movement speed and direction; an experimenter can control a trigger mechanism in thevirtual sensing device through visual programming, so that the visual, auditory, tactile, olfactory and other sensory information of a tested object are simulated; according to the immersive virtualreality device, the authenticity, the immersion, the interactivity and the flexibility of the virtual reality system are improved, and the tested object can be completely immersed in a virtual scene to carry out outward cognitive behavior training.

The invention discloses a cluster time synchronization method, device, system and apparatus and a readable storage medium. The method disclosed by the invention is applied to a cloud platform, and comprises the following steps: receiving an updating request of a time synchronization strategy; updating time server information and/or synchronization rules in the time synchronization strategy according to the updating request, and obtaining a target time synchronization strategy; calling all cluster interfaces so as to update the chrony configmap configuration files in the nodes included in all the clusters according to the target time synchronization strategy, and triggering the chrony daemonset container services in the nodes included in all the clusters to be restarted by utilizing the updated chrony configmap configuration files, thereby realizing time synchronization, wherein the cloud platform contains and manages a plurality of clusters, and different clusters are realized based ondifferent architectures. Time synchronization is realized for clusters of different architectures based on the cloud platform, and large-scale management is facilitated. Correspondingly, the invention also provides a cluster time synchronization device, system and apparatus and a readable storage medium, which also have the above technical effects.

The invention provides a communication method and device for a wireless local area network and a communication terminal. The communication method for the wireless local area network comprises a step of receiving a first type of wake-up frames, wherein the first type of wake-up frames include timing synchronization functions wherein the timing synchronization functions in the first type of wake-upframes are used for indicating time synchronization with associated access point equipment, and the timing synchronization functions in the first type of wake-up frames are consistent with the timingsynchronization functions in a beacon frame broadcast by the access point equipment. According to the technical scheme, work station equipment is prevented from being periodically awakened to monitorTIM (Traffic Indication Map) information in the beacon frame and being accessed to a channel in a competitive mode to obtain cached downlink data, the power consumption loss of the work station equipment is reduced, the frequency spectrum utilization efficiency is improved, and meanwhile, the time synchronization between the work station equipment and the access point equipment is realized.

The invention discloses a time type plug-in authentication method and system. The method comprises the following steps: step S100, a client initiates request information of applying for a plug-in to a server; step S200, the server releases applied plug-in information to the client according to device identification information of the client; step S300, the client applies to the server for time information authentication in the received plug-in information; and after the authentication success of the server, step S400 is executed; and step S400, the client updates the time information in the plug-in information to the current time when the plug-in information is authenticated. The purpose is to solve the problem that the plug-in information is subjected to tampering and replay attacks by authenticating the time in the plug-in information, and the security of the system is effectively improved.

The invention discloses a time synchronization method. The time synchronization method comprises the following steps that: an OLT sends a synchronous message to a base station through an ONU; after receiving the synchronous message sent by the OLT, the ONU carries a first timestamp in the synchronous message and forwards the synchronous message to the base station; the first timestamp is the local time of the ONU itself, which is recorded when the synchronous message is forwarded; after receiving the synchronous message forwarded by the ONU, the base station sends a delay request message to the OLT through the ONU; after receiving the delay request message sent by the base station, the ONU carries a fourth timestamp in the delay request message and forwards the delay request message to the OLT; the fourth timestamp is the local time of the ONU itself, which is recorded when the delay request message is received; and, after receiving the delay request message forwarded by the ONU, the OLT carries the fourth timestamp in a delay response message and sends the delay response message to the base station. The invention further discloses a time synchronization method for the OLT, a time synchronization method for the ONU, the OLT, the ONU and a time synchronization system.

The invention provides a multi-sensor time synchronization device and method. The device comprises an acquired data processing module, a frequency divider, a camera, a laser radar and a data storage module, a pulse per second (PPS) signal output by a GPS module is used as a time reference of sensor time synchronization, the camera and the laser radar are triggered to acquire data, and the data are stored in the data storage module; the UTC time obtained by a GPS module from a satellite is used as a system clock source, and timestamps are added to the image data and the point cloud data, so that time synchronization of multiple sensors is realized, a time synchronization result is ensured to be accurate and reliable, and dependence of the sensors on a PTP protocol function and influence brought by network instability can be avoided.

The invention provides a time determination method and system based on hierarchical control and a medium. The time determination method comprises the following steps: S1, each standby TS receives a wireless time service signal and completes respective first time service integrity monitoring based on the wireless time service signal so as to obtain a first 1PPS of the standby TS, the first 1PPS is a demodulation second of the standby TS, and the wireless time service signal does not access a hierarchical control network; S2, each main TS completes respective second time service integrity monitoring based on a wired time service signal received by the wired time service link so as to obtain a second 1PPS of the main TS, and the second 1PPS is a demodulation second of the main TS; and S3, a deviation between the first 1PPS and the second 1PPS is determined, and third time service integrity monitoring is completed based on the deviation as time service integrity information of the current node.