45 results about "Clock correction" patented technology

The invention provides a precision compensation method and device for a real-time clock of an electric energy meter. The method comprises the following steps: acquiring the current environment temperature of a to-be-measured electric energy meter; when it is determined that the current environment temperature exceeds a preset normal temperature interval, on the basis of a plurality of preset temperature correction points and compensation coefficients corresponding to the preset temperature correction points, real-time clock correction is carried out on the to-be-measured electric energy meter at the preset temperature correction points in sequence according to the temperature from low to high; wherein the compensation coefficient is obtained by performing polynomial fitting on the original temperature value reading of the sensor corresponding to the preset temperature correction point and a reference temperature value. According to the invention, error transmission during precision compensation is avoided, and the real-time clock precision of the electric energy meter is improved.

The invention discloses a clock correction prediction method based on multi-scale feature extraction and dynamic attention fusion. The used prediction model comprises a multi-scale feature extraction layer, a double-branch time sequence modeling layer and a dynamic attention fusion layer; the multi-scale feature extraction layer extracts low-frequency features, transition features and high-frequency features of the input sequence, further generates three different features, and splices all the different features with the low-frequency features, the transition features and the high-frequency features in a channel dimension to obtain multi-scale fusion features; the multi-scale fusion features sequentially pass through channel attention and space attention, then pass through an adaptive gating network to generate two dynamic weight coefficients, and are subjected to weighted fusion to obtain input features of a high-frequency branch and a low-frequency branch; the double-branch time sequence modeling layer generates short-term fluctuation features and long-term trend features, and the dynamic attention fusion layer generates long and short-term fusion features. According to the method, the analysis capability of the model on the complex sudden change mode in the clock error data is remarkably improved, and the prediction precision is further remarkably improved.

The application provides a clock correction method, system, medium and product of a storage logging instrument, relates to the technical field of clock correction, and the method comprises the following steps: when a starting instruction is received, reading an accelerometer file path in a target configuration file, obtaining acceleration data and corresponding local time stamps of a plurality of storage logging instruments; displaying acceleration curves of the plurality of storage logging instruments on a visual interface, determining a reference storage logging instrument in response to a reference selection operation of a user, determining a starting baseline and an ending baseline in response to a baseline setting operation of the user on the acceleration curve of the reference storage logging instrument, and calibrating a starting moving point corresponding to the starting baseline and an ending moving point corresponding to the ending baseline in response to a moving point calibration operation of the user on the acceleration curve of the other storage logging instrument; and performing time synchronization correction on the local time stamps of the other storage logging instruments according to the starting baseline, the ending baseline, the starting moving point and the ending moving point.

The invention discloses a joint correction method and system for GNSS (Global Navigation Satellite System) non-structural deformation and a storage medium. According to the method, GNSS pseudo-range and carrier phase observation data and precise products such as a precise orbit and clock correction are obtained, a three-component displacement time sequence caused by a non-tidal atmospheric load, a non-tidal ocean load and a land hydrological load and a temperature-driven thermoelastic displacement time sequence are constructed, and the three-component displacement time sequence and the temperature-driven thermoelastic displacement time sequence are unified to a reference frame and a time system consistent with GNSS calculation. After interpolating the non-structural displacement vector to an observation epoch according to time, converting the non-structural displacement vector to a geocentric rectangular coordinate system from a site local coordinate system ENU, and projecting the non-structural displacement vector to a sight line direction from a satellite to an observation station reference point to form an equivalent geometric distance correction item; the correction terms are respectively applied to pseudo-range observation and carrier phase equivalent meter domain observation in the form of the same domain as observation, and then GNSS daily arc precise calculation is performed to output a coordinate time sequence, and preferably, the method can be used for a precise single-point positioning integer ambiguity fixing technology.

In one embodiment, a peripheral device includes an oscillator, a counter to be driven by the oscillator and provide a peripheral device counter value, and processing circuitry to receive a host device counter value from a host device, read host device clock translation parameters from a host memory of the host device, the host device clock translation parameters providing translation between the host device counter value and a host device clock time, read peripheral device clock translation parameters providing a translation between the peripheral device counter value and a peripheral device clock time, read the peripheral device counter value, compute a clock correction as a function of a difference between the host device clock time and the peripheral clock time, based on the host device and peripheral device counter values and clock translation parameters, and correct the host device or peripheral device clock translation parameters based on the clock correction.

This invention proposes a measurement system, method, apparatus, and medium for a delay-locked loop (PLL) within a chip. The system includes: a clock correction unit, with the output of the PLL communicatively connected to it; the clock correction unit includes a period calibration delay unit, a fine adjustment delay unit, a calibration control terminal, and an adjustment control terminal; a clock comparison unit, with the output of the clock correction unit communicatively connected to its input; a counting unit, with its input communicatively connected to both the output of the clock comparison unit and the clock correction unit; and a data processing unit, with its input communicatively connected to the counting unit. The data processing unit outputs the period jitter measurement result and the phase linearity measurement result of the clock signal under test based on the count value. According to the technical solution of this invention, the measurement results can reflect the true clock signal under test, improving the efficiency of chip circuit structure adjustment.

The invention relates to the technical field of internal clock correction of an intelligent fusion terminal, in particular to a self-adaptive clock synchronization method for the intelligent fusion terminal, which comprises the following steps: S1, acquiring a plurality of clock synchronization sources and corresponding quality characteristic parameters thereof; s2, calculating a corresponding comprehensive quality score, and selecting a clock synchronization source with the highest comprehensive quality score as a main clock source; s3, calculating the time deviation between the internal clock of the intelligent fusion terminal and the main clock source, and if the time deviation exceeds a deviation threshold value, correcting the internal clock of the intelligent fusion terminal through the main clock source; s4, calculating a clock drift rate between a current corrected value and a previous corrected value of the internal clock of the intelligent fusion terminal, if the clock drift rate exceeds a drift rate threshold value, triggering main clock source switching, and returning to the step S2; and S5, periodically executing the step S2, and dynamically updating the main clock source. According to the invention, the flexibility, reliability and stability of clock synchronization of the intelligent fusion terminal can be improved.

This application relates to the field of clock correction technology, and provides a clock correction method, apparatus, electronic device, and storage medium. The method receives a first synchronization message sent by a master clock node in the current scheduling cycle. If the first synchronization message indicates that a slave clock node is the time synchronization target, the method records the synchronization message reception time of the first synchronization message. It then sends a delay request message to the master clock node and records the delayed message transmission time of the delay request message. The method receives a response message returned by the master clock node in response to the delay request message, the response message carrying the delayed message reception time of the master clock node. Finally, it receives a second synchronization message sent by the master clock node in the next scheduling cycle, and parses the synchronization message transmission time of the master clock node sending the first synchronization message from the second synchronization message. Based on the four acquired times, it calculates the clock deviation between the slave clock node and the master clock node, and performs time correction on the slave clock node according to the clock deviation.

This provides a real-time kinematic (RTK) solution for mobile devices with multi-constellation, multi-frequency (MCMF) capabilities, where a single base station may have a baseline much farther than that of a traditional base station. To achieve this, the embodiment addresses atmospheric effect differences between the rover and the base station when the GNSS positioning of the mobile device (rover) is fixed, thereby allowing the determination of individual tropospheric delay errors at the base station. The embodiment can utilize additional satellite measurements that are not available without RTK correction, and can also use orbital clock correction for these additional satellite measurements.

The invention discloses an indoor positioning method, device, equipment, medium and product, and the method comprises the steps: packaging an RTCM message sent by a CORS base station platform into a positioning system information block through an LMF network element, and transmitting the positioning system information block to an indoor distribution system, thereby enabling a terminal to carry out the positioning through the positioning system information block broadcasted by the indoor distribution system, and enabling the positioning efficiency to be improved. Wherein the RTCM telegraph text comprises satellite ephemeris, orbit correction, clock correction and RTK differential data, so that the terminal can perform high-precision indoor positioning by combining the satellite ephemeris, the orbit correction, the clock correction and the RTK differential data, and the indoor positioning precision is improved.

The application discloses a terminal positioning method and device, equipment and storage medium, and specifically discloses the following: receiving a ranging code decoding key issued by a core network; receiving encrypted ranging codes broadcast by at least four base stations; using the ranging code decoding key to decrypt the received encrypted ranging codes to obtain original ranging codes corresponding to the base stations; based on the original ranging codes, performing code phase alignment processing on the original ranging codes and copied ranging codes with the same structure as the original ranging codes to obtain the propagation time of signals of the encrypted ranging codes from the base stations to a terminal, and calculating the pseudo distances between the terminal and each base station according to the propagation time; obtaining high-precision geographic positions and clock correction information of the at least four base stations, and based on the pseudo distances corresponding to the at least four base stations respectively, the high-precision geographic positions and the clock correction information, constructing an equation group with the three-dimensional coordinates and clock bias of the terminal as unknowns, and determining the position coordinates of the terminal by solving the equation group.

This invention discloses a real-time dynamic relative positioning method, system, and device based on state domain correction information. The method involves: a server receiving real-time GNSS observation data streams from the entire network of reference stations and real-time precise orbit clock correction streams to perform real-time precise single-point positioning calculations, and broadcasting network-wide floating-point ambiguity information; then performing real-time phase deviation estimation and broadcasting it; further, combining the network-wide reference station observation data streams and real-time precise orbit clock errors to perform real-time precise single-point positioning fixed-solution calculations, and broadcasting network-wide atmospheric delay information; performing atmospheric modeling and broadcasting the model information; and a user terminal receiving the precise orbit clock correction information, phase deviation information, and model information broadcast by the server in real-time, generating virtual observation values ​​at its approximate coordinates, and performing real-time dynamic relative positioning calculations. This invention can significantly reduce the algorithm complexity of current precise positioning servers and is compatible with existing relative positioning user terminals while ensuring one-way communication and privacy protection.

The application relates to a clock calibration device, a method and a tire pressure monitoring system. The clock calibration device is applied to a tire pressure sensing device. A temperature reading module reads the working temperature of the tire pressure sensing device when the tire pressure sensing device is in a wake-up reset state. Then, a query module queries clock buffer data corresponding to the working temperature. A correction determination module determines whether the clock buffer data is consistent with initial data and generates a determination result. A correction module obtains clock correction data according to the determination result. Finally, a clock calibration module modulates the clock signal of the tire pressure sensing device according to the clock correction data, so that the frequency of the modulated clock signal reaches a target frequency. In this way, the working period offset of the tire pressure sensing device caused by temperature change can be dynamically corrected during the working process, thereby prolonging the service life of the tire pressure sensing device and finally improving the reliability of the monitoring system.

The invention provides a high-precision synchronous fire-fighting emergency broadcasting system and method with state feedback, relates to the field of fire-fighting emergency broadcasting, and solves the technical problems that a traditional fire-fighting emergency broadcasting system is low in time synchronization precision, unknowable in playing state and unverifiable in integrity. The method comprises the following steps: acquiring a plurality of timestamps of a time synchronization message, and analyzing a clock delay amount; analyzing the current temperature compensation clock drift amount of each broadcast terminal; analyzing the clock correction amount of each broadcast terminal based on the clock delay amount and the temperature compensation clock drift amount, and correcting the clock of each broadcast terminal based on the clock correction amount; and constructing an original audio fingerprint sequence and a return audio fingerprint sequence, and analyzing the playing integrity of each broadcast terminal. The application is used in a fire-fighting emergency broadcast process.

Disclosed are systems, apparatuses, methods, and computer-readable media for machine learning-based clock generation. An example method includes collecting measurements from a plurality of sensors within a network device obtaining clock drift information from a machine learning (ML) model based on the measurements from the plurality of sensors and a clock signal of the network device, wherein the ML model is trained to determine a clock drift with reference to a reference clock, generating a clock correction signal to correcting the clock signal using the clock drift information, wherein the clock signal is synchronized to the reference clock based on the clock correction signal, and communicating with an external network device based on the clock signal.

The invention relates to a fast convergence satellite clock error resolving method under regional station distribution, which belongs to the field of satellite navigation, and comprises the following steps: in a regional monitoring network, constructing a normal equation by using an ionosphere-free combination pseudo range and a carrier phase by using a known precise orbit and a station coordinate; in the Kalman filtering stage, covariance forecasting is carried out on satellite clock correction, receiver clock correction and troposphere delay, cycle slip detection and covariance forecasting are carried out on ambiguity, when the ambiguity has no cycle slip and converges, the forecasting covariance is reset to be a minimum value so as to apply reinforced constraint, and the reinitialization time is remarkably compressed; performing parameter estimation to obtain an optimal value and a pseudo-range post-test residual error; the satellite clock error constant deviation is calculated through multi-station multi-epoch residual errors in a combined mode, and the satellite clock error constant deviation is fused into the original code deviation to form extended code deviation parameter broadcasting; the user side only needs to add the extension correction in the pseudo-range observation value to realize instantaneous centimeter-level positioning. According to the invention, high-precision and high-availability real-time precise single-point positioning service under the regional network condition is realized.

The application discloses a kind of time correction method and system for ensuring the validity of electric energy meter period electric quantity, comprising: judging whether electric energy meter needs to be corrected, obtains the determination result;When the determination result indicates that electric energy meter needs to be corrected, determine the time correction strategy;Based on the time correction strategy selected and the preset time interval for obtaining electric energy meter period electric quantity, electric energy meter is time corrected.Therein, the time correction strategy includes: point-to-point time correction strategy and broadcast time correction strategy.The method of the present application can realize the clock correction of gateway electric energy meter while ensuring that period electric quantity is not lost, ensure the effectiveness and uniqueness of electric energy meter period electric quantity while carrying out electric energy meter clock time, ensure the legality of electric energy metering, ensure the fairness and justice of electric power trade;The method of the present application can be applied to electric energy meter acquisition master station at all levels, and the minute-level time correction of various gateway and user electric energy meters is realized through the master station;It can also be applied to electric energy meter field inspection equipment, and the time correction of electric energy meter is realized through field detection.

The application provides a TCMS system quadruple redundancy time correction method and system, which determines a master clock of a train control and management system (TCMS); wherein, the TCMS has quadruple redundancy, and the TCMS comprises a master vehicle control unit (VCU) and a slave VCU; based on the master clock, the master VCU and the slave VCU are respectively corrected; after a preset time length, the master VCU and the slave VCU are re-corrected according to a current clock difference between the master VCU and the slave VCU. The method provided by the application determines the master clock of the TCMS with quadruple redundancy, corrects the master VCU and the slave VCU according to the master clock, and re-corrects the master VCU and the slave VCU according to the current clock difference between the master VCU and the slave VCU after the preset time length, so that more accurate and reliable clock correction is achieved.

The invention discloses a multi-satellite-based enhanced precision single-point positioning service real-time fusion method, which belongs to the technical field of navigation positioning, is used for real-time precision single-point navigation positioning, and comprises the following steps of: eliminating abnormal corrections according to the consistency of adjacent epoch corrections of the same service; unifying coordinate frames of different services by using a Helmert seven-parameter coordinate transformation model, and carrying out weighted average on the track product to obtain a high-precision fused track product; after orbital change compensation and broadcast ephemeris unified compensation of the clock correction number are calculated, constraint conditions are introduced to construct an improved clock correction Kalman filtering fusion model to obtain a high-precision fusion clock correction product; and the two products are applied to real-time precise single-point positioning of a receiver end. According to the invention, by unifying coordinate frames of different services and introducing constraint conditions to construct an improved clock correction Kalman filtering fusion model, real-time and rapid multi-service ephemeris orbit and clock correction high-precision fusion is realized, and a fused product can be effectively applied to real-time precise single-point positioning of a receiver end.

This invention proposes a method for clock calibration of an SPI device, comprising the following steps: Step 1: When the master device in the SPI device performs a write operation, the master device pulls the CSN signal low and provides 48 consecutive SCK clock signals; after the slave device detects that the CSN signal is low, it starts counting from the rising edge of the first SCK clock signal, and the counter starts counting from 0; the counting frequency is the high-frequency clock f inside the slave device. HSI When the slave device detects the 48th SCK clock signal, the counter stops counting and stores the count value CNT in the slave device's register; Step 2: The master device reads the count value CNT held in the slave device's counter register; Step 3: Calculate the slave device's system clock f based on the count value. HSI Step 4: The master device writes the correction compensation value, i.e., the correction frequency mentioned in step 3, into the corresponding address of the slave device's register to complete the clock correction.

The invention discloses a seabed node clock drift type determination and correction method and device, electronic equipment and a medium. The method comprises the following steps: collecting a plurality of ocean nodes, and counting nodes needing clock correction as to-be-corrected nodes; seismic data corresponding to each node is extracted, and then the clock drift type of the node is determined; and performing clock drift correction processing according to the clock drift type to obtain a corrected node. According to the method, nodes with drifting and nodes without drifting are selected from actual data, the maximum energy curve is extracted through cross-correlation processing, the type of the curve is the type of clock drifting, then clock drifting correction processing is completed, quality control of subsequent node data and rationality of processing are guaranteed, and the accuracy of clock drifting correction is improved. And the quality of node data information is further improved.

A communication system includes correction circuitry. The correction circuitry includes detection circuitry and clock correction circuitry. The detection circuitry determines a first correction value based on a first rising edge and a second rising edge of a divided clock signal. The clock correction circuitry receives a first clock signal, a second clock signal and the first correction value, and generates a first adjusted clock signal and a second adjusted clock signal based on the first correction value. The first clock signal and the second clock signal. The first adjusted clock signal and the second adjusted clock signal are used by divider circuitry to generate the divided clock signal. A frequency of the divided clock signal is less than a frequency of the first clock signal and the second clock signal.

The invention provides a high-precision clock synchronization method, and relates to the technical field of clock synchronization, and the method comprises the steps: S1, collecting the historical data of a constant-temperature crystal oscillator; s2, using the constant temperature crystal oscillator data to train a BP neural network to obtain a BP neural network frequency prediction model; s3, the BDS receiver and the GPS receiver are used for receiving the corresponding satellite clock information and resolving the satellite clock information, timestamps of the BDS and the GPS are obtained, and a source clock is determined; s4, determining standard time; s5, when communication interruption occurs in the BDS and the GPS and the constant-temperature crystal oscillator enters a punctuality state, performing frequency adjustment according to the obtained prediction frequency, then converting the virtual prediction timestamp into prediction time, and taking the prediction time as standard time; s6, sending the standard time information to the base station in a message form; and S7, the base station sends the standard clock information to a local device, and the local device performs clock correction synchronization according to the standard time. The method has the beneficial effects that the stability can be improved while the synchronization accuracy is improved.

The invention discloses a road surface positioning data supplementing method and system based on a Beidou satellite navigation system. The method comprises the following steps: acquiring the number of satellites which can participate in calculation at present; if the number of satellites which can participate in calculation currently is larger than or equal to four, a normal calculation process is executed; if the number of satellites which can participate in calculation at present is equal to three, executing a three-satellite fixed elevation positioning and timing process; if the number of satellites which can participate in calculation at present is less than three, executing a clock correction and position calculation process; and outputting a positioning result. The invention provides a processing method for two states of three satellites and less than three satellites, which is realized from the perspective of software and is simple and easy to implement; through actual measurement, under the condition that the satellite receiver captures less than four satellites and the local position cannot be calculated, position data supplementation can be effectively carried out.

The invention relates to a clock error forecasting method and device, computer equipment and a readable storage medium. The method comprises the following steps: acquiring a to-be-processed clock error sequence; performing data preprocessing on the to-be-processed clock error sequence to obtain a standardized residual error sequence; processing the standardized residual error sequence by using a probability weighted fuzzy time sequence model to obtain a probability weighted fuzzy time rule set; recursive prediction is carried out in combination with the fuzzy time rule set, and a predicted value set matched with the fuzzy time rule is obtained; performing defuzzification processing on the prediction value set to obtain a prediction residual error; and carrying out inverse standardization processing on the prediction residual error, and combining the prediction residual error with a trend term extracted by fitting in a data preprocessing process to obtain a target clock error prediction result. According to the method, data noise and magnitude difference are eliminated through data preprocessing, and sequence time sequence characteristics are fully captured by adopting the probability weighted fuzzy time sequence, so that the clock correction forecasting precision can be effectively improved, and a reliable clock correction forecasting solution is provided for high-precision real-time positioning of a satellite navigation system.

The invention provides a fault tolerance method and system for a clock synchronization network, the clock synchronization network and a computer readable storage medium. The clock synchronization network comprises at least two compression hosts and a plurality of synchronization hosts, the compression hosts comprise a main compression host and a standby compression host, and the fault tolerance method of the clock synchronization network comprises the following steps: responding to the situation that the main compression host cannot operate normally; starting a fault-tolerant function of the standby compression host to determine a local clock of the standby compression host in the integration period, and correcting local clocks of the plurality of synchronization hosts according to the local clock of the standby compression host to realize clock fault-tolerant synchronization in the integration period; and responding to normal operation or successful restarting of the main compression host, starting a fault-tolerant function of the main compression host to determine a local clock of the main compression host in the integration period, and correcting local clocks of the standby compression host and the plurality of synchronization hosts according to the local clock of the main compression host to realize clock fault-tolerant synchronization in the integration period.

The invention discloses a 4G base station satellite communication clock synchronization method based on an atomic clock, and relates to the technical field of satellite communication clock synchronization, and the method comprises the steps: collecting initial time references of a satellite portable station terminal atomic clock, a satellite load atomic clock and a baseband atomic clock calibration end, carrying out the deviation calculation of every two, and generating a synchronization ready signal; sliding window updating is carried out on the one-way signal propagation delay in the delay sequence buffer area, a synchronous correction step length coefficient is set in combination with the time deviation compensation amount, and the clock correction amount with step length scaling is obtained; issuing the clock correction with step size zooming to a satellite portable station terminal atomic clock, constructing a three-dimensional phase space trajectory, calculating a maximum Lyapunov index, and generating a preventive re-calibration instruction; and a preventive re-calibration instruction is sent to a satellite portable station terminal atomic clock, a satellite load atomic clock and a baseband atomic clock calibration end, and an optimized synchronous ready signal is generated. According to the invention, the robustness and timeliness of full-link synchronization are enhanced.

Embodiments of the present disclosure provide a solution for BeiDou Navigation Satellite System (BDS) B2b signal assistance information transmission. In the solution, a target device(110) receives, from a server(120), assistance information of a BDS B2b signal. The server(120) manages positioning for the target device(110). The assistance information comprises at least one of: navigation precision information related to the BDS B2b signal, data bit assistance information related to the BDS B2b signal, almanac assistance information related to the BDS B2b signal, universal time coordinate information related to the BDS B2b signal, orbit correction information related to the BDS B2b signal, clock correction information related to the BDS B2b signal, or quality information associated with a state space representation (SSR), or an ionospheric model information for BDS B2b signal. In this way, the BDS B2b signal can be used for positioning of the target device(110).

The application relates to the technical field of power system automation and protection control, and is a traveling wave sampling frequency clock correction method and system based on Kalman filtering. The system comprises an MCU internal phase-locked loop unit, a GPS / Beidou second pulse unit, a local clock unit and a digital phase-locked loop unit. The digital phase-locked loop unit comprises a frequency discriminator and phase detector, a filter unit and a voltage-controlled oscillator. The system outputs a GPS / Beidou second pulse signal and a local second pulse signal. The frequency discriminator and phase detector calculates the phase difference and sampling frequency difference between the GPS / Beidou second pulse signal and the local second pulse signal. The whole system constitutes a negative feedback regulation loop, and is adjusted in real time through a voltage-controlled temperature compensation crystal oscillator, so that the local clock is completely synchronized with the GPS / Beidou clock, that is, the phase difference is zero, and the Kalman filter outputs the final frequency and phase information, which is used for accurately calibrating the ADC sampling time stamp in the MCU internal phase-locked loop unit.

The invention provides a clock correction method and system for storage logging instruments, a medium and a product, and relates to the technical field of clock correction, and the method comprises the steps: reading an accelerometer file path in a target configuration file when a starting instruction is received, and obtaining acceleration data of a plurality of storage logging instruments and corresponding local timestamps; the acceleration curves of the multiple storage logging instruments are displayed on a visual interface, and a benchmark storage logging instrument is determined in response to benchmark selection operation of a user; in response to baseline setting operation of a user on the acceleration curve of the reference storage logging instrument, determining a starting baseline and an ending baseline; in response to a moving point calibration operation of a user on other storage logging instrument acceleration curves, calibrating a starting moving point corresponding to the starting base line and an ending moving point corresponding to the ending base line; and according to the starting baseline, the ending baseline, the starting moving point and the ending moving point, executing time synchronization correction on the local timestamps of other storage logging instruments.