169 results about "Clock skew" patented technology

The invention discloses a power distribution station overload risk alarm method and device based on multi-source sensing data fusion, and relates to the technical field of intelligent early warning, and the method comprises the following steps: in the operation process of a power distribution station, injecting a micro-amplitude synchronization pulse in a multi-source sensing data collection stage, collecting a pulse feedback result, calculating and collecting clock offset, and constructing a second-level alignment vector; time sequence synchronization among different sensing channels is realized, and a turn-back sensitive baseline is established. According to the method, through multi-source sensing data alignment and turn-back identification, in combination with edge fidelity filtering, heat accumulation calculation and fast and slow variable decoupling, accurate early warning of abnormal load fluctuation is realized, a closed-loop control mechanism of residual feedback is established, and the accuracy and foresight of power distribution station overload risk identification are remarkably improved.

Die or chip interconnect clock skew compensation can be performed for a multi -IC (Integrated Circuit) module. A timing margin or eye-width parameter (for example, a setup or hold time) for each of one or more interconnect lanes may be measured at a first die or chip of the multi - IC module that is receiving data and clock signals from a second die or chip of the multi -IC module. Compensation information can be determined based on the measured timing margin or eye-width parameter for each of one or more interconnect lanes. Compensation for clock skew can then be based on the determined compensation information.

The invention relates to the technical field of copper pipe flaw detection, in particular to a flaw detection ink jet line time sequence synchronous control method, system and equipment, and the method comprises the following steps: flaw detection equipment and an ink jet head establish a master-slave node relationship according to a communication network protocol, the flaw detection equipment is used as a master node, and the ink jet head is used as a slave node; the master node acquires flaw detection signals of the copper pipe in real time, encapsulates the flaw detection signals into a data packet carrying a timestamp, and transmits the data packet to the slave node according to a communication network protocol; after the slave nodes receive the data packets, the timestamps are analyzed, and ink jet trigger compensation time is calculated based on a network transmission delay prediction model; a synchronous ink jet instruction is generated according to the ink jet trigger compensation time, and an ink jet head is controlled to mark the defect position of the copper pipe; and periodically checking clock skew data of the master and slave nodes based on a communication network protocol, and dynamically updating the network transmission delay prediction model. According to the invention, the core problem of mark position offset caused by insufficient clock synchronization precision is effectively solved.

An apparatus includes a clock skew calibration circuit configured to be coupled to a multi-phase clock generator through a plurality of delay lines, wherein a first clock skew calibration unit comprises a frequency doubler configured to receive a plurality of multi-phase clock signals and generate a clock signal based on the plurality of multi-phase clock signals, a frequency divider configured to receive the clock signal and generate a reduced frequency signal based on the clock signal, and a delay line control circuit configured to compare the duty cycle of the reduced frequency signal with a predetermined duty cycle, and generate a first control signal to adjust the skew of the first multi-phase clock signal through adjusting a first delay applied to the first multi-phase clock signal until a calibrated signal of the first multi-phase clock signal is achieved.

The invention belongs to the technical field of unmanned aerial vehicle communication perception integration, discloses a double-base ISAC clock synchronization algorithm design and system based on an LoS reference diameter, and aims to solve the problem of measurement errors caused by clock asynchronization of a transmitting end and a receiving end. And a receiving end receives a communication signal based on an LoS path and a sensing signal based on a non-line-of-sight (NLoS) path through a communication and sensing integrated design. The invention provides a clock synchronization algorithm based on LoS reference path assistance, and the time delay and Doppler frequency of the signal are measured by using the propagation characteristics of the LoS signal, so that the clock skew and Doppler frequency skew are accurately estimated. According to the algorithm, communication and sensing signals are combined, the clock skew of the receiving end is dynamically adjusted and compensated, asynchronous error accumulation is reduced, and sensing precision and system performance are remarkably improved. Simulation results show that the method effectively enhances communication and sensing functions of the system in application scenarios such as low-altitude economy.

The embodiment of the invention provides a clock synchronization method and device, a computer readable medium and electronic equipment. The clock synchronization method comprises the following steps: acquiring network state information of target equipment, wherein the target equipment is equipment needing to be subjected to clock synchronization with a clock synchronization server; if the network transmission quality between a clock synchronization server and target equipment is determined to be greater than or equal to a set threshold value according to the network state information, entering a clock adjustment stage, and correcting clock information of the target equipment in the clock adjustment stage; and if the clock skew between the target device and the clock synchronization server is adjusted to a set range, entering a clock holding stage, and determining whether to switch to the clock adjustment stage according to the network state information in the clock holding stage. According to the technical scheme of the embodiment of the invention, clock synchronization processing can be performed based on the network state information of the equipment, and the clock synchronization precision can be improved.

Embodiments of the present disclosure describe techniques for implementing enhanced skew control for synchronizing two clock meshes in an IC or chip. A disclosed skew adjust control, methods, and systems enable effective and efficient operations to optimize a coarse delay setting to maintain for a functional mode of operation of the system, where only fine delay steps are applied to an adjustable one of the clock meshes, based on measured clock skew, to synchronize the clock meshes.

The invention provides an electric power internet of things minute-level data acquisition method based on hierarchical time synchronization, which comprises the following steps of: 1, dividing an HPLC (High Performance Liquid Chromatography) channel into a time synchronization time slot and a data uploading time slot, and dynamically adjusting the bandwidth proportion of the time synchronization time slot and the data uploading time slot; 2, clock skew compensation is completed through bidirectional message interaction of the master node and the slave node, and a uniform minute-level time framework of the whole network is established; step 3, based on the local clock calibrated by the terminal equipment, calculating an accurate acquisition triggering moment by combining the distributed offset parameters, and when a preset time slot is reached, automatically executing instantaneous sampling of data; and 4, constructing a priority evaluation model based on the voltage abrupt change rate and the emergency level, calculating data acquisition priorities in real time, and executing corresponding operations according to different priorities. According to the method, active preemptive transmission of fault feature data in a single acquisition period is realized through a dynamic priority model in which the voltage break rate is linked with the event level.

The invention relates to an ephemeris broadcast and time synchronization method for Beidou pseudolite deformation monitoring, and belongs to the technical field of satellite positioning. The method comprises the following steps: constructing a linearization error equation based on a pseudo-range observation value, and solving a clock error correction amount in combination with a robust iterative algorithm to improve the time synchronization precision; analyzing ephemeris parameters of the Beidou GEO satellite, calculating earth-fixed coordinates of the Beidou GEO satellite, and rotating and adapting the earth-fixed coordinates; establishing an affine transformation relationship between the pseudo-satellite coordinates and GEO ephemeris, and generating optimized pseudo-satellite ephemeris data; and a time synchronization protocol is designed, and clock skew is compensated through bidirectional timestamp interaction of the main base station and the pseudo satellite. According to the method, nanosecond synchronization of the pseudo-satellite and the real satellite is realized, the ephemeris parameter redundancy problem of the static pseudo-satellite is optimized, multi-system cooperative work is supported, and the deformation monitoring reliability and precision under the complex terrain are remarkably improved.

The invention provides a multi-magnetic accurate positioning method based on APSO-LM fusion, and solves the technical contradictions that global search and local convergence are unbalanced and the resolving efficiency is low in the existing multi-magnetic accurate positioning technology. The method comprises the following steps: constructing a magnetic moment calibration module, selecting a sensor array calibration point, collecting magnetic field data, and calculating a precise magnetic moment amplitude based on a magnetic dipole model; an NSS-VMGT initial positioning result is input through a parameter initialization module, APSO and LM algorithm parameters are configured, and particle vectors are normalized; generating a particle swarm by using an APSO global search module, and iteratively screening a global optimal parameter as an LM initial value; calculating a residual error and a Jacobian matrix by means of an LM local refining module, and iteratively optimizing and outputting a magnetic source position and a magnetic moment; and the dynamic compensation module is used for calibrating clock skew and inhibiting environment interference. The device is realized based on STM32H743, and comprises a 7 * 7 lis2mdltr sensor array, a dual-chip data acquisition link, an APSO-LM algorithm hardware acceleration module and an upper computer interaction unit.

The embodiment of the invention discloses a time synchronization method and device based on Kalman filtering, a medium and a product. According to the method, the precision and the speed of time synchronization are improved by establishing a double-state model containing clock skew and clock drift; a dynamic suppression factor is introduced to adaptively adjust an observation noise covariance to deal with abnormal noise; distinguishing and independently adjusting the process noise covariance of the clock skew and the clock drift by adopting a block self-adaptive strategy so as to match different noise characteristics of the clock skew and the clock drift; and finally, high-precision and high-robustness time synchronization is realized through Kalman filtering.

The invention provides an inter-satellite link bidirectional measurement method based on a same-time same-frequency full-duplex system, which overcomes the problem that receiving and transmitting of a traditional time-division half-duplex system cannot work at the same time and at the same frequency, and can effectively improve the information transmission rate and the ranging precision. The inter-satellite transmission rate, the measurement frequency and the data updating rate can be doubled; simultaneous and same-frequency measurement between satellites can greatly eliminate distance measurement errors caused by relative motion between satellites, clock skew and Doppler effect; a complex orbit model does not need to be established to improve the distance measurement precision, the time scale reduction error is greatly reduced, and the overall measurement performance is improved.

The invention relates to the technical field of radio orientation, in particular to an enhanced Beidou precise time service method based on a receiver clock model, which comprises the following steps: acquiring multi-source data, and preprocessing the multi-source data; establishing a Beidou receiver clock model, optimizing model parameters through a least square method, outputting a first clock drift value and a first coefficient, and predicting a second clock drift value and a second coefficient by using a machine learning model; then, a Bayesian fusion model is utilized to be combined with the Beidou receiver clock model and the machine learning model, a clock drift predicted value is output, and a time migration predicted value is calculated; calculating a carrier-to-noise ratio loss value, an autocorrelation function distortion value and a phase change value, generating a signal quality index, and calculating an error compensation value by using a weight distribution mechanism; and finally, correcting the clock skew according to the error compensation value. Through combination of multiple models, the precision of clock drift prediction is improved, and the clock skew is effectively corrected, so that the precision of mountainous area time service is improved.

The invention relates to the technical field of telecommunication, and discloses an earphone and sound box multichannel audio synchronous transmission method and system, and the method comprises the steps: firstly obtaining an initial audio stream of a target device (earphone and sound box), recognizing format features, analyzing a frequency spectrum component, generating a left / right sound channel signal, then detecting the transmission priority of the sound channel signal, analyzing a channel distribution demand, and carrying out the transmission of the sound channel signal; the query equipment responds to the time delay and calculates a synchronization reference value, then determines a signal competition hotspot based on the value, analyzes the interference intensity and the frequency band occupancy rate, calculates a clock offset index, then determines a collaborative playing path according to the index, queries a phase tolerance threshold, formulates a time sequence calibration process, and finally corrects a sound channel signal by using the process. Obtaining, recording and optimizing clock reference parameters, and generating a synchronous transmission scheme. The overall sound effect stability of cooperative playing of the earphone and the sound box can be improved.

A signal generator may include a reference horizontal synchronization signal generation block which generates reference horizontal synchronization signals based on a number of clock signals per a horizontal time, a frame clock calculation block which calculates a first frame clock number based on a number of the clock signals per the horizontal time, a frame clock comparation block which calculates a clock offset by comparing the first frame clock number and a second frame clock number generated based on a number of the clock signals per a frame time, a clock distribution block which generates horizontal synchronization signals by distributing a number of the clock signals corresponding to the clock offset to the reference horizontal synchronization signals, and a vertical synchronization signal generation block which generates a vertical synchronization signal based on the horizontal synchronization signals.

The invention relates to a cross-chip clock synchronization system, chips and electronic equipment. The clock synchronization system comprises a first clock adjustment link, a second clock adjustment link and a clock phase difference detection module, the first clock adjustment link is configured to adjust the phase delay of an input clock signal and generate a first clock signal based on the adjusted input clock signal; the first clock adjusting link is arranged in the two chips in a crossing manner, and the first clock adjusting link comprises a first cross-chip transmission circuit; the second clock adjustment link is configured to adjust the phase delay of the input clock signal and generate a second clock signal based on the adjusted input clock signal; the second clock adjusting link comprises a delay copy circuit, and the transmission delay of the first cross-chip transmission circuit is consistent with the transmission delay of the delay copy circuit; the clock phase difference detection circuit is configured to detect a phase difference between the first clock signal and the second clock signal. According to the invention, clock skew across chips can be reduced.

Clock synchronization in a multichip module is provided. Relative clock skews among a plurality of digital devices are detected based on a pairwise exchange of clock signals between digital devices. In some aspects, the plurality of digital devices comprising at least one noncommunicating pair of digital devices. Based on the relative clock skews of the various devices, the respective clock signals of the plurality of digital devices are deskewed.

The invention relates to the technical field of photoetching machine data transmission, and discloses an ultra-high-speed distributed data transmission synchronization system of a direct-writing photoetching machine. The system comprises a dynamic exposure pulse analysis module which constructs a distributed transmission delay calculation model based on historical operation data, collects data such as a laser trigger pulse sequence in real time and outputs a theoretical transmission synchronization value; the multi-channel time sequence offset detection module generates a node-level multi-channel time sequence offset matrix through multi-dimensional comparison of the theoretical value and the actual transmission time sequence; the spatial topology mapping module is combined with the physical position and the link impedance parameter to generate a time sequence abnormal propagation path probability distribution cloud picture so as to locate a high-delay area; and the dynamic bandwidth allocation module configures a transmission strategy according to the data, starts redundant channel parallel transmission for a high-delay area, and implements dynamic clock offset compensation for adjacent nodes, so that the synchronization stability and transmission efficiency of data transmission are effectively improved.

Provided is a method for performing clock synchronization in a wireless network performed by an electronic device acting as a third device. The method includes: receiving a data packet transmitted from a first device via a second device, the data packet including a first timestamp when the first device transmits the data packet; acquiring a local timestamp indicating when the third device receives the data packet, and time information transmitted by the second device indicating when the data packet is received; computing delay information of a specified link part of a transmission link between the third device and the first device accordingly; computing, according to the delay information of the specified link part and a link type of the specified link part, a clock skew corresponding to the specified link part; and performing, according to the clock skew, clock synchronization on a transmission node corresponding to the specified link part.

This application discloses a clock synchronization method and a related apparatus in a distributed system. The distributed system includes a plurality of nodes, and the plurality of nodes include a master node and a plurality of slave nodes. The master node obtains a plurality of local clock offsets, where each of the plurality of local clock offsets indicates a clock offset between two nodes in the distributed system. The master node determines a global clock offset of a target slave node relative to the master node based on the plurality of local clock offsets, and sends the global clock offset to the target slave node. The target slave node obtains a clock reference value of a local clock, and then performs clock synchronization based on the clock reference value and the global clock offset.

An apparatus includes a clock skew calibration circuit configured to be coupled to a multi-phase clock generator through a plurality of delay lines, wherein a first clock skew calibration unit comprises a frequency doubler configured to receive a plurality of multi-phase clock signals and generate a clock signal based on the plurality of multi-phase clock signals, a frequency divider configured to receive the clock signal and generate a reduced frequency signal based on the clock signal, and a delay line control circuit configured to compare the duty cycle of the reduced frequency signal with a predetermined duty cycle, and generate a first control signal to adjust the skew of the first multi-phase clock signal through adjusting a first delay applied to the first multi-phase clock signal until a calibrated signal of the first multi-phase clock signal is achieved.

The invention discloses a multi-port PTP time service device and a time service method thereof, and the device comprises a main time server which is used for providing high-precision time information; the auxiliary time server is used for providing time information when the main time server fails; the multi-port PTP switch is provided with a plurality of network interfaces and is used for connecting the main time server, the auxiliary time server and the plurality of time synchronization clients; the plurality of time synchronization clients are used for receiving the time information and performing time synchronization; according to the invention, a time synchronization service is provided for a plurality of devices at the same time, and the time synchronization requirement in a multi-device and multi-node complex network environment is met; the clock skew and the network delay are accurately estimated and compensated, and the synchronization precision is further improved; the synchronization strategy is dynamically adjusted according to the network condition and the number of devices, it is ensured that the synchronization precision is not affected when the network environment changes or the number of the devices increases, the auxiliary time server is automatically switched to when the main time server breaks down, and the reliability and stability of the system are improved.

The invention discloses a data synchronous backup method and system for a distributed mobile storage cluster, and relates to the technical field of mobile distributed storage, comprising the following steps of: cooperatively calculating clock skew and drift of each node based on an ultra-wideband bidirectional ranging result of a mobile node in the distributed mobile storage cluster; forming a distributed relative clock under the conditions of no external time source and fixed master control node; when any mobile node is subjected to data change, calling a distributed relative clock to obtain a logic timestamp; generating difference information through a local conflict-free copy data engine; binding the logic timestamps with the difference information to form increment synchronization entries and storing the increment synchronization entries in a to-be-synchronized list; when the two mobile nodes enter a communication range, comparing the maximum logic timestamps in the to-be-synchronized lists of the two mobile nodes, and initiating a synchronization request from a backward party to a leading party; according to the invention, the distributed relative clock is formed based on the bidirectional ranging result, and the autonomous synchronization capability and the consistency keeping efficiency of the mobile distributed storage cluster are improved.

The invention relates to a positioning method, a positioning device and a readable storage medium, and relates to the technical field of satellite navigation. The positioning method is applied to a receiver, and the receiver receives a pseudo satellite signal sent by each target satellite in a plurality of target satellites simulated by a pseudo satellite base station; wherein the number of the target satellites is at least four, and the target satellites are satellites which are invisible at the position where the receiver is located; for each pseudo-satellite base station, determining auxiliary positioning information of the pseudo-satellite base station according to the pseudo-satellite signal corresponding to the pseudo-satellite base station; wherein the auxiliary positioning information comprises the base station position of the pseudo satellite base station and the clock skew, and the clock skew is the skew between the clock of the pseudo satellite base station and the local clock of the receiver; and determining the position of the receiver according to the auxiliary positioning information of the pseudo satellite base station.

The invention discloses a method for realizing synchronization of a local clock and a system clock based on Beidou time service, which comprises the following steps that: a Beidou terminal receives a Beidou time service signal, packages time information into a data packet through a preset communication protocol and an interface, and adds a check code and a timestamp; errors and interferences in a data transmission process are processed by adopting error correction coding and digital filtering technologies, so that the data transmission reliability is improved; according to a network topology structure and link quality, an optimal transmission route is dynamically selected, and a multi-path transmission and load balancing technology is adopted, so that the transmission efficiency is improved; the receiving end reorganizes and verifies the received time information data packet, extracts time information and converts the time information into a standard time format; the method comprises the following steps: receiving Beidou time service signals for multiple times, calculating transmission delay and clock skew by utilizing a least square method, and dynamically adjusting local clock parameters by adopting a proportional integral control algorithm and a Kalman filtering algorithm to realize nanosecond time synchronization.

The invention relates to a clock skew digital calibration method based on similar triangles, and belongs to the field of clock interleaving type digital-to-analog conversion circuits. The method comprises the following steps: firstly, carrying out preliminary calibration on sub-channel output through an imbalance and gain mismatch calibration module; a clock skew calibration module is adopted to perform clock skew calibration, the selected sub-channel is used as a reference, a correlation coefficient and a skew percentage are calculated by comparing sampling point difference values of a channel to be calibrated and a reference channel, a sampling error value is calculated according to the skew percentage by using a similar triangle principle, and an output code is compensated; therefore, accurate output after calibration is obtained. According to the calibration method, an additional reference channel is not needed, the selected sub-channel is directly used as the reference channel, calculation is relatively simple when the clock skew percentage is extracted, and the clock skew of the clock interleaving ADC can be rapidly calibrated with small resource consumption and power consumption.

The invention discloses a cascade clock synchronization circuit. The cascade clock synchronization circuit comprises M stages of clock synchronization circuits in cascade connection, and each clock synchronization circuit comprises a phase detection module and a clock generation module. When the i-th count value is X + 2N-1 and X + N-1, the phase detection module outputs an i-th phase detection signal and sets the i-th phase detection signal as an effective level; and the clock generation module carries out frequency division on the ith high-frequency clock N according to the effective level of the ith phase detection signal to generate an ith Nth frequency division clock synchronous with the ith high-frequency clock N, counts the level change of the ith-level phase detection signal to obtain an ith cascade count value, and outputs the ith-level cascade signal and sets the ith-level cascade signal as the effective level when the ith cascade count value is X + 2N-1 and X. According to the invention, the problem of synchronization failure caused by clock skew accumulation of the high-speed clock and the low-speed clock in the multi-channel clock synchronization process is solved. Especially in a multi-channel data synchronous transmission scene such as a multi-BANK multi-SerDes architecture, the problem of clock synchronization failure caused by clock skew accumulation is effectively solved.

The invention provides a time-space structured sparse optical coding deepwater heterogeneous network data synchronization method and system, and the method comprises the steps: carrying out the sparse decomposition of the time sequence clock deviation data of each current underwater node at a transmitting end device of a deepwater heterogeneous network based on a trained over-complete dictionary, and obtaining an original sparse vector; converting the dynamic compression observation data corresponding to the original sparse vector into an optical signal, and transmitting the optical signal to a receiving end device of the deepwater heterogeneous network by a transmitting end device through an umbilical cable; demodulating the optical signal into an observation vector through receiving end equipment, inputting the observation vector into the trained deep expansion network model, and outputting a reconstructed sparse vector by the deep expansion network model; and recovering the reconstructed sparse vector into a clock skew signal through the over-complete dictionary, and generating a clock synchronization calibration instruction to realize data synchronization of the corresponding underwater node. According to the invention, the problems of high bandwidth occupation, low signal ratio and poor reconstruction time efficiency existing in the underwater network time synchronization technology can be solved.

The invention relates to a TMR sensor network self-synchronization time service method, device and equipment and a medium, and the method comprises the following steps: obtaining a power line power frequency magnetic field signal collected by a TMR sensor in real time, extracting a fundamental component, and marking a magnetic field zero crossing point; based on a PTP protocol, a master node periodically broadcasts a synchronous message at a magnetic field zero crossing point and adds a magnetic field zero crossing point timestamp, and a slave node compares a time difference between the receiving timestamp and the magnetic field zero crossing point and calculates a first delay; the slave node sends a delay request message, the master node compares the receiving timestamp with the magnetic field zero crossing point time difference, and second delay is calculated; and calculating a clock skew based on the first time delay and the second time delay, calculating a result obtained by subtracting the clock skew from the current time by the slave node, and taking the result as accurate time of the slave node to finish time synchronization. Compared with the prior art, the method has the advantages that passive high-precision self-synchronizing time service can be realized, and the like.

Embodiments of the present disclosure describe techniques for implementing enhanced skew control for synchronizing two clock meshes in an IC or chip. A disclosed skew adjust control, methods, and systems enable effective and efficient operations to optimize a coarse delay setting to maintain for a functional mode of operation of the system, where only fine delay steps are applied to an adjustable one of the clock meshes, based on measured clock skew, to synchronize the clock meshes.