59 results about "Time error" patented technology

The present application relates to host computer control technical field, and specifically provides a kind of host computer and its working condition control method, device and test system and storage medium.The host computer working condition control method described in the present application includes: obtaining the total number of steps contained in working condition, the execution information and duration of each step, and the serial number of the current step to be executed;Obtain the system absolute time corresponding to the starting time of the current step to be executed, and calculate and record the system absolute time corresponding to the starting time of each subsequent step;And, when the current and each subsequent step is executed, the system absolute time corresponding to the starting time of each step is used to jump between adjacent steps.The present application is helpful to reduce the time error generated when the host computer step jumps, helps to reduce the time error generated during the execution of working condition, can make the host computer program execution time meet the required working condition time requirement, and can improve the working condition control effect of host computer.

This invention provides a method and system for controlling the delay time of electronic detonators, comprising: configuring delay values ​​for each electronic detonator via an initiator; sending delay time calibration commands to all electronic detonators and calculating the total duration of the reference square wave of the delay time calibration commands to obtain T0; calculating T1 based on T0; upon receiving the delay initiation command, the electronic detonator calculates and writes the value to a delay timer based on T1, and decrements the timer; after the delay timer of the electronic detonator reaches zero, writing the value of T1mod div to the delay timer and decrementing the timer; and detonating the electronic detonator after the delay timer reaches zero. This invention uses a frequency-division clock to compensate for the delay time error caused by the delay, thus solving the problem of amplified delay time error caused by using only a frequency-division clock.

The application provides a kind of unmanned aerial vehicle time synchronization method and module based on dynamic error compensation, it is related to time synchronization technical field.The method includes confirming the real-time time error between two unmanned aerial vehicles according to the time information of the message sent and received by two unmanned aerial vehicles and the temperature data of the FPGA installed on unmanned aerial vehicle, inputting the recorded historical time error, temperature data and acceleration data into adaptive network model to obtain predicted time error, then determining comprehensive time error, obtaining compensated modified clock frequency according to comprehensive time error, time synchronization period and current clock frequency, and then converting into the control signal of digital phase-locked loop, adjusting the local clock frequency of unmanned aerial vehicle according to the control signal, and adjusting the unmanned aerial vehicle in advance, so that two unmanned aerial vehicles can be time synchronized thereafter.The above-mentioned method is not limited to hardware performance, and considers precision and real-time performance, to realize real-time compensation of time error in high dynamic environment.

The invention discloses a switch cabinet partial discharge sensor time synchronization method and system and a storage medium. A monitoring host sends a time service signal to a sensor; the sensor estimates propagation time delay, determines response time delay and calculates a propagation time delay error; through multiple times of communication between the host and the sensor, response time delay is eliminated, the time error of time service data between the host and the sensor is calculated, the time error is eliminated, and time synchronization is achieved. Time synchronization is achieved through inherent delay data of the monitoring host and the sensor, and the method is stable and reliable and is not affected by the external environment.

This application discloses a time synchronization monitoring method, device, terminal equipment, and storage medium. The time synchronization monitoring method includes: collecting corresponding monitoring data signals for different locations of a preset building; performing modal analysis on the monitoring data signals to obtain several corresponding intrinsic mode function signals; fitting the errors between the intrinsic mode function signals to obtain the relative time error of the location; and eliminating the errors between the monitoring data signals based on the relative time error to obtain synchronized monitoring data. This method can solve the technical problem of time errors in monitoring data from different locations in the time synchronization monitoring of super high-rise buildings, reduce the monitoring cost of time synchronization, and synchronously analyze monitoring data from different locations, thereby providing a more accurate data foundation for structural damage identification and safety assessment.

The present disclosure relates to methods for recovering the time of a clock in a first node after a service interruption, and systems for performing these methods. A second node may hold a time during a downtime of the first node and transmit synchronization pulses to the first node, which may be used to estimate a time error that may be used to adjust a clock of the first node.

The application discloses a mixed networking synchronization path decision method and device, and relates to the technical field of time synchronization. The mixed networking synchronization path decision method comprises the following steps: calibrating time precision information of a time source and a synchronization node; transmitting the time precision information of the time source and synchronization node time cumulative error information to a downstream node; and deciding, by the downstream node, an optimal synchronization path and a working state of a node port according to the time precision information of the time source, the synchronization node time cumulative error information and local time precision information of the node, wherein the working state of the node port comprises a master clock state, a slave clock state and a passive clock state. The application can adapt to time sources and synchronization nodes with different time precisions, and can decide and select an optimal path with the minimum time error in a mixed networking scene.

The invention provides a method and a device for solving a time error in 2038. The method comprises the following steps: aiming at the condition that a kernel version of an operating system is smaller than a first preset version, responding to a first operation of a user, setting 64-bit time to obtain system calling and 64-bit time setting system calling, so that an application program obtains and sets 64-bit time, the bit number of RTC time is modified into 64 bits, and kernel time of the operating system comprises 64-bit time; when the application program is in the running state, the application program processes 64-bit time through a preset 64-bit time processing function, and the preset 64-bit time processing function is set in a source code of the application program. According to the method and the device, the operation system can directly process the 64-bit time by using the original kernel version without upgrading the kernel version, the scheme is simple, and the difficulty of processing the 64-bit time by the operation system is reduced.

The present application relates to a kind of aerospace remote sensing instrument imaging time acquisition and corresponding method, in the method, probe head software sends time request pulse to main control software at exposure starting moment, main control software records the system time code of receiving time request pulse moment, the time is called time code, main control software adopts first-in first-out principle, saves the time code of last n times, and the group of time code is sent to probe head software through the command frame of next cycle, probe head software will last n times of time code, imaging command, parameter, remote sensing data together with package, download.This imaging time acquisition and corresponding method produces time error, which is determined by the accuracy parameter of crystal oscillator, and the software does not produce error, so under the condition that the accuracy parameter of crystal oscillator is better than the requirement of time error, the method can obtain imaging time with high precision and assist data corresponding in later period.

The invention is suitable for the technical field of intelligent terminals, and provides an equipment adaptive time synchronization method and device, terminal equipment and a storage medium, and the method comprises the steps: periodically detecting the instantaneous deviation between the local time of the equipment and the network reference time according to a synchronization period; calculating a predicted time error according to the instantaneous deviation, a predicted time window and a clock drift rate, the clock drift rate being determined based on the instantaneous deviation; the predicted time error is compared with an allowable error threshold value, and if the predicted time error is larger than the allowable error threshold value, time synchronization operation is triggered; after the time synchronization operation is triggered, the synchronization period is dynamically adjusted according to the clock drift rate, and the adjusted synchronization period is used for determining the time for detecting the instantaneous deviation next time. According to the invention, the device can adaptively balance time precision and resource consumption, so that the synchronization effect of high precision, low power consumption and network friendliness is realized.

There is provided mechanisms for relative time error (TE) information distribution in a telecommunication network using a precision time protocol (PTP). A method is performed in a gateway device in a telecommunication network having hierarchical segments. The method comprises receiving TE information from a telecom grandmaster (T-GM) of the hierarchical segments. The method comprises preserving a total TE information of the received TE information. The method comprises resetting an accumulated path TE of the received TE information. The method comprises outputting an indication of the reset accumulated path TE and the preserved total TE information to a sub-segment of the hierarchical segments.

A method to detect time errors in a global navigation satellite system (GNSS) receiver can include determining a carrier-to-noise (CNo) delta between a CNo ratio of a first type of GNSS signal and a CNo ratio of a second type of GNSS signal. A time error may be detected based on the first CNo delta and a first threshold CNo delta, the time error indicating a use of an erroneous time uncertainty (TUNC) by the GNSS receiver. An error mitigation operation may be performed based on detecting the time error. The first type of GNSS signal may be selected based on determining that a first level of susceptibility to errors associated with the first type of GNSS signal is lower than a second level of susceptibility to errors associated with the second type of GNSS signal.

Aspects presented herein may enable a user equipment (UE) to obtain and utilize crowdsourced system information block (SIB) data from a server do determine whether to decode SIB to improve the overall performance of positioning and power consumption. In one aspect, a UE receives, from a network entity, a portion of information related to a SIB based on a position of the UE, where the SIB is associated with a time transfer, where the information related to the SIB includes at least one of: an availability of the SIB, a type of the SIB, a transmitting interval of the SIB, a time uncertainty (TUNC) associated with the SIB, a time error associated with the SIB, or a reliability of a serving cell timing. The UE decodes the SIB based on the portion of the information.

The invention provides a time error determination method of a measuring instrument, belongs to the technical field of data processing, and is used for improving the accuracy of time error determination. The test system comprises a processing device, a synchronous machine and a time pulse generator, the processing device, the synchronous machine and the time pulse generator are connected with M tested measuring instruments, the synchronous machine is connected with the time pulse generator, and the method comprises the following steps: the synchronous machine triggers a test process to start; the time pulse generator sends a first pulse signal to the M measuring instruments at the moment t1 and sends a second pulse signal to the M measuring instruments at the moment t2 after the moment t1, and the interval between the moment t1 and the moment t2 is a preset duration t; and under the condition that the test process is started, the processing equipment determines respective time errors of the M measuring instruments according to the moments of the first pulse signals received by the M measuring instruments, the moments of the second pulse signals received by the M measuring instruments and a preset duration t.

A symbol time synchronization device with parallel architecture is disclosed having a sample storage and reordering module including a control unit and 2×P cyclically ordered FIFOs, an interpolation module configured to supply, at each clock stroke, a time error indication (Err-Ind) taking one of the values “Nominal”, “Underrun” or “Overrun”, at a current clock stroke, the control unit is configured to write a sample to each of P successive FIFOs, read a sample from each of P, P−1, or P+1 successive FIFOs depending on whether the time error indication (Err-Ind) is respectively “nominal”, “underrun” or “overrun”, reorder samples to be supplied to the interpolation module using a permutation network.

The invention discloses a time synchronization method suitable for a large-scale wireless ad hoc network, and the method comprises the steps: capturing a hop of neighbor node with the highest time precision among nodes through periodically broadcasting a time notification message, and enabling the hop of neighbor node to serve as a time reference node of the node, and interacting a round trip timing (RTT) time synchronization protocol message with the node, so as to measure and calculate a time error between the node and a high-time-precision one-hop neighbor node, and adjust local time, thereby realizing high-precision time synchronization of the whole network. By using the time synchronization method provided by the invention, the time synchronization of the whole network nodes of the large-scale wireless ad hoc network can be realized, and the sub-microsecond time synchronization precision can be realized in a 20-hop range.

Method for regulating and / or controlling an electrical machine by extended synchronous modulation based on space vector modulation, using the following input variables: - a set (α) of switching times (α1, ..., α x ), which appear within a subsequent sampling interval, - a current angular error (α Error,Now ) and a subsequent angular error ( α Error,Next ), - a minimum switching angle (α min ), where an online calculation of switching angles (τ1) and a flow trajectory (ψ) ab ) is done, and where pulse pattern (s uvw (γ el )) depending on a modulation level (m) can be calculated online, characterized by the fact that with different signs of the angular error (α) Error,Now , α Error,Next ) α the smaller angular error in absolute value (α Error,Now , α Error,Next) determines the maximum switching time (Δα) Error,max ) can potentially be redistributed, where by summing all around the minimum switching angle (α min ) reduced switching times from the set (α) that corresponds to a current or subsequent space vector ( u → Now , u → N ext ) are associated with the switching time (Δα) Now,max , Δα Next,max ) is determined to predict the occurrence of the space vector ( u → Now , u → N ext ) can be reduced to a maximum within the sampling interval, - where in the case of a negative current angular error (α) Error,Now ) to shorten the current space vector ( u → Now ) the actual switching time to be redistributed (Δα) from the minimum of the maximum switching time (Δα) Error,max ) and α of the switching time (Δα Now,max) is determined, whereby the switching duration to be redistributed (Δα) is chronologically distributed to the corresponding switching durations (α) Now,i ) divided and then each individual switching duration (α) Now,i ) to determine the corresponding Δα i is reduced, whereby the extension of the switching state ( u → N ext ) to determine the switching duration to be redistributed (Δα) solely by considering the first associated switching duration (α) Next,1 ) is done, - where in the case of a positive angular error (α Error,Now ) to shorten the space vector ( u → N ext ) the actual switching time to be redistributed (Δα) from the minimum of the maximum switching time (Δα) Error,max ) and the switching time ( Δα Next,max ) is determined, whereby the switching duration to be redistributed (Δα) is chronologically distributed to the corresponding switching durations (α) Next,i ) divided and then each individual switching duration (α) Next,i ) around the corresponding (Δα i) is reduced, whereby the extension of the switching state ( u → Now ) to determine the switching duration to be redistributed (Δα) solely by considering the first one for the switching state ( u → Now ) apparent switching time (α) Now,1 ) is carried out, where the modified set (α) of switching durations is output.

The invention discloses an on-site interaction system and method for a competition assistant group based on a synchronous metronome, and relates to the technical field of multi-terminal cooperative control, and the method comprises the following steps: obtaining program list data of each target object, and carrying out the local caching of the program list data, and generating cached data; obtaining time calibration data through an operator time service interface; executing instruction triggering according to the cache data, and generating triggering instruction data including future absolute execution moments according to the program data and the time calibration data. According to the scheme, the local cache of the program list data and the time calibration data are accurately acquired, so that high-precision synchronous operation among multiple target objects is realized, the influence of network delay or terminal time error on field interaction is avoided, and in the metronome processing process, the main node is appointed and the heartbeat packet data is generated, so that the efficiency of the metronome processing is improved. And other target objects carry out progress deviation calculation and fine tuning instruction generation according to the heartbeat packet.

The present invention discloses a multi-axis motion control method and system for automated equipment, which relates to the technical field of multi-axis motion control. By collecting the data of the equipment in real time and based on the real-time error and equipment status, an adaptive compensation strategy is designed and adjusted. This adaptive ability enables the system to flexibly cope with factors such as equipment aging and external environment changes, ensuring high control accuracy and stability under different working conditions. Through the cooperation of the data acquisition and processing module and the error detection and analysis module, the system can accurately obtain the motion error value and change trend. This provides an accurate basis for subsequent compensation adjustment, enabling the compensation amount to be dynamically optimized in each control cycle, avoiding error accumulation, and improving the system accuracy and stability; by cleaning and standardizing the multi-axis data group DW, the system can more accurately identify and evaluate the source of errors, thereby designing a more refined compensation strategy.

Embodiments of the present disclosure provide methods and apparatuses for determining link asymmetry delay. A method performed by a network node may include determining a first difference of a time error of a first port of a network node and a time error of a second port of the network node. The method may further include determining a second difference of a time error of the first port of the network node and a time error of the second port of the network node after a receiving link and a transmitting link of the first port are flipped. The method may further include determining a delay asymmetry value of the first port of the network node based on the first difference and the second difference.

The invention discloses a video synchronization method, a distributed system and a computer program product, and the method comprises the steps: taking the time of a master device as a time reference, and synchronizing local clocks, vertical synchronization signal phases and play starting time of a first video frame of all slave devices based on a PTP protocol; when the video frame decoding of any device is abnormal, sending a notification of deleting the video frame of the corresponding display time sequence to all other devices in the distributed system; and all devices in the distributed system cyclically and dynamically adjust the picture updating rate based on an accumulator until the picture updating rate is aligned with the display refresh rate, ending the cycle, and displaying the decoded video frames according to the video frame display time sequence. The method and the device are used for solving the problem that display between a master device and a slave device is asynchronous or a picture is torn due to the fact that a timestamp is influenced by a network signal and a timer is influenced by an operation time error.

In some implementations, a monitoring system may obtain reporting data from a node of a plurality of nodes in a synchronization network. The monitoring system may determine, based on the reporting data, relative time error information associated with the node. The monitoring system may determine, based on at least one of the reporting data or the relative time error information, whether the node is associated with one or more time error performance issues. The monitoring system may provide information indicating whether the node is associated with the one or more time error performance issues.

The embodiment of the invention discloses a time synchronization and time source quality evaluation model training method and device, and the time synchronization method comprises the steps: determining the statistical feature data and time sequence feature data of a time error between a local time source and a candidate time source based on the time data fed back by the candidate time source and the local time, determining statistical characteristic data of the network quality based on the network quality index data fed back by the candidate time source, taking the statistical characteristic data of the time error and the statistical characteristic data of the network quality as target statistical characteristic data, and determining environmental characteristic data based on the environmental index data; determining quality evaluation indexes of the candidate time sources based on all the feature data, and selecting an optimal time source; and acquiring current time data of the optimal time source, updating local time based on the current time data, and performing time synchronization on the terminal. According to the technical scheme provided by the embodiment of the invention, the accurate reference time can be adopted for time synchronization, and the accuracy of time synchronization can be improved.

The invention provides a nuclear power DCS system time calibration method and system, an electronic device and a medium, in the method, when a time calibration task is responded, whether a reference clock is forcibly calibrated or not is judged through local time and first calendar time of a dynamic clock, and the reference clock is forcibly calibrated without forcibly calibrating; the crystal oscillator error is quantized based on the second calendar time and the local time of the reference clock so as to capture the actual condition of the crystal oscillator deviation, then the dynamic clock timing rate is corrected by combining the first calendar time, the local time and the quantization parameter, and the obtained crystal oscillator deviation compensation parameter can dynamically adjust the dynamic clock timing rate instead of direct hopping timing. Time deviation caused by crystal oscillator errors is eliminated, the time reference of lower-level equipment can be effectively unified, and the problem of time errors caused by the crystal oscillator errors among the modules in the nuclear power DCS system is effectively solved.

A method to detect time errors in a global navigation satellite system (GNSS) receiver can include determining a carrier-to-noise (CNo) delta between a CNo ratio of a first type of GNSS signal and a CNo ratio of a second type of GNSS signal. A time error may be detected based on the first CNo delta and a first threshold CNo delta, the time error indicating a use of an erroneous time uncertainty (TUNC) by the GNSS receiver. An error mitigation operation may be performed based on detecting the time error. The first type of GNSS signal may be selected based on determining that a first level of susceptibility to errors associated with the first type of GNSS signal is lower than a second level of susceptibility to errors associated with the second type of GNSS signal.

The invention discloses an industrial equipment fault prediction and health management method and system, and relates to the technical field of industrial control, and the method comprises the steps: sending a time synchronization instruction to equipment, recording a time synchronization moment, setting a power-off waiting time length, calculating an RTC time error after the equipment is powered on again, and recording environment parameters; acquiring the RTC time of the equipment and the time drift distance of the last time synchronization moment in real time, updating an abnormal criterion based on the time drift distance and an RTC time error, and entering a time correction mode; the method comprises the following steps: identifying a key event based on a machine learning model, extracting a time anchor point of the key event, constructing an LSTM model based on environmental parameters and RTC time, predicting estimated time intervals, respectively correcting the estimated time intervals including the time anchor point and not including the time anchor point, and updating an RTC time error, thereby realizing adaptive equipment time anomaly detection and repair.

The invention discloses a real-time clock adaptive digital temperature compensation method, equipment, a medium and a product, and relates to the field of real-time clocks. The method comprises the following steps: measuring a digital fine tuning register value enabling the output frequency of a real-time clock to reach a target frequency under a plurality of reference temperature points, generating digital fine tuning register reference data covering a complete working temperature range based on the symmetry of a crystal frequency temperature curve, and constructing a static compensation model; in the running process of the real-time clock, dynamically correcting reference data in the static compensation model by acquiring reference time and local time, calculating a time error and combining a temperature distribution condition to obtain a self-adaptive updated compensation model; and obtaining a target digital fine tuning register value from the corrected model according to the current temperature, and compensating the output frequency of the real-time clock. The problem that a traditional fixed compensation model cannot cope with crystal aging and stress changes can be relieved, and the long-term timing precision and reliability of a real-time clock are improved.

A method to detect time errors in a global navigation satellite system (GNSS) receiver can include determining a carrier-to-noise (CNo) delta between a CNo ratio of a first type of GNSS signal and a CNo ratio of a second type of GNSS signal. A time error may be detected based on the first CNo delta and a first threshold CNo delta, the time error indicating a use of an erroneous time uncertainty (TUNC) by the GNSS receiver. An error mitigation operation may be performed based on detecting the time error. The first type of GNSS signal may be selected based on determining that a first level of susceptibility to errors associated with the first type of GNSS signal is lower than a second level of susceptibility to errors associated with the second type of GNSS signal.

This invention discloses a method and system for playing back air traffic control data based on message timing. The method includes: a reading thread extracting the timestamp and hexadecimal message data of each line of the message based on a two-level timestamp extraction strategy; a decoding thread extracting the message and sorting it using a sliding time window double threshold sorting algorithm before sending it to the decoding queue; a sorting thread transmitting the message data; and a sending thread and a dynamic scheduling algorithm based on a reference time calculating the precise sending time of each message and sending it to the target system for playback. The advantages of this invention are as follows: (1) The playback timing accuracy is naturally matched with the protocol accuracy, and the time error is strictly controlled within 1 / 128 seconds; (2) It effectively solves the trajectory distortion caused by the disorder of the original data; (3) The system resource occupancy rate is low, supporting high-concurrency playback tasks; (4) The startup delay is short, meeting the fast response requirements of the playback system; (5) The processing throughput is high, adapting to high-density air traffic control data playback application scenarios.