77 results about "Time error" patented technology

The invention provides a cumulative time error prediction method based on a time window LSTM model. The method comprises the steps of obtaining historical data of a sensor; performing time feature processing on the historical data, and selecting the historical data in a time window with a certain length as a time sequence; an LSTM model is used for modeling and training the time sequence, the input of the LSTM model is the sensor time error change condition in the time window, and the output of the LSTM model is the difference value between the sensor time at the current moment and the standard time; and correcting the sensor time according to a prediction result of the LSTM model. The actual time is independent from the time on the sensor, so that the time synchronization process is simplified; through selection of a time window, consumption of computing resources is remarkably reduced on the premise that prediction precision is guaranteed; through a correction mechanism, high-precision synchronization is achieved, computing resources are optimized, and it is ensured that sensor time and standard time are kept consistent.

The invention relates to a broadband power line carrier node ranging method, which is characterized in that transmission time is obtained based on each count value of a source node and the frequency of the source node, so that time deviation caused by reference time difference between the nodes is avoided; meanwhile, the destination node corrects the response delay count value through the frequency deviation coefficient, so that the fine difference of the frequency between the source node and the destination node is considered, and the duration corresponding to the response delay count value in the source node is equal to the duration corresponding to the corrected response delay count value in the destination node; therefore, the response signal can be sent at the accurate sending moment, and correspondingly, the source node can receive the signal at the accurate moment, so that the time error in the signal transmission process between the nodes is reduced, and the ranging accuracy is improved. The distance measurement method provided by the embodiment of the invention is simple and convenient, and can accurately obtain the distance between the nodes.

The invention discloses a time synchronization method and system for a detector in a pipeline, and mainly relates to the technical field of application of the detector in the pipeline. Comprising the following steps: setting the transmitting frequency of a transmitter in a MARK box; detecting a second pulse synchronization signal sent by a satellite through the MARK box; resetting a timer in the MARK box by a rising edge of a pulse per second signal sent by the satellite, and pulling up a PWM pulse level; the timer turns over the PWM level, and PWM wave output is closed after the PWM level is turned over five times; the steps are repeated once every five seconds. The method has the beneficial effects that the time of the inner detector can be periodically synchronized, the time error accumulated due to the jitter of the crystal oscillator of the inner detector is reduced, and the accuracy of subsequent defect positioning is improved.

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.

The embodiment of the present invention relates to a processing method and device for detecting the time accuracy of an intelligent switch, the method comprising: a testing device receives a test temperature zone, a single-step temperature difference, a test number and a temperature adjustment mode, and sets a corresponding temperature measurement sequence; and the temperature adjustment mode traverses the temperature measurement sequence; and during the traversal process, the ambient temperature in the thermostat is adjusted to the currently traversed test temperature, and an absolute time error test is performed on the intelligent switch in the thermostat, and the current test temperature and the absolute time error form a corresponding temperature-error pair; and positive / abnormal temperature zones are identified based on all obtained temperature-error pairs; and a time accuracy detection state is set based on a positive / abnormal temperature zone set; and a detection report is formed by the obtained positive / abnormal temperature zone set and the time accuracy detection state and saved. Through the present invention, a time accuracy detection mechanism for intelligent switches related to temperature changes can be provided.

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 present application discloses a method and device for time synchronization of a monocular camera assisted by an IMU for unmanned aerial vehicle (UAV), which relates to the technical field of time synchronization. The method comprises the following steps: calibrating an inertial measurement unit (IMU) and a monocular camera, using a time signal generated by a clock source as a data acquisition synchronization point, performing time synchronization on the inertial measurement unit (IMU) and the monocular camera, placing a target in front of the monocular camera or making the monocular camera point to the target, photographing the target to obtain N frames of target images and corresponding IMU data, using an interpolation algorithm to align each frame of the image and the corresponding IMU data according to the timestamp, generating a data set with the same timestamp, finally analyzing the target image in the data set, tracking the movement speed of feature points in the pixel plane, calculating the UAV speed according to the IMU data, estimating and correcting the time deviation of the monocular camera based on the difference between the movement speed and the UAV speed, implementing dynamic compensation, and using an arbitrary target to calculate and compensate for the synchronization time error between the IMU and the monocular camera.

The present disclosure provides a calibration method, system, device, medium and program product for sampling time error, and the calibration method includes: obtaining the calibration times of different channels of an analog-to-digital converter to a preset direction; obtaining the difference between data correlations based on the calibration times; adjusting the preset direction based on the difference to obtain a target direction; and calibrating the sampling time of the channel based on the target direction. The present disclosure achieves calibration of the sampling time by obtaining the calibration times of different channels of an analog-to-digital converter to a preset direction, and then obtaining the difference between data correlations to adjust the preset direction. The sampling time error calibration can be completed when any Nyquist frequency domain signal is input, and the calibration direction judgment and error correction can be completed without the need for TIADC to design additional calibration channels, thereby reducing hardware circuit overhead, expanding the application scenarios of the error calibration method, and having universal applicability.

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 invention discloses an unmanned aerial vehicle ad hoc network test platform and method, and the platform comprises a time synchronization module which achieves the high-precision time synchronization; the process management module is used for reducing time delay and intelligently allocating resources; the information packet structure definition module is used for specially making an information packet structure to facilitate comprehensive tracking analysis; and the path management module is used for dynamically switching paths and correcting errors to reduce the packet loss rate. The testing method comprises the steps of preparation before testing, data transmission testing and receiving end processing. Various optimization designs are provided in the modules and steps, including high-precision calibration of the time synchronization module, improvement of efficiency and flexibility of the process management module, adaptation of the information packet structure definition module to a complex environment, and guarantee of data transmission efficiency of the path management module. Compared with the prior art, the method has the advantages that the problems of disordered data packet sequence and inaccurate transmission delay calculation caused by time errors are reduced, and the accuracy of data transmission test results is improved.

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

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.

The present invention provides a cumulative time error prediction method based on a time window LSTM model, the method acquires historical data of a sensor; performs time feature processing on the historical data, and selects historical data within a time window of a certain length as a time series; uses an LSTM model to model and train the time series, the input of the LSTM model is the change of the sensor time error within the time window, and the output is the difference between the current sensor time and the standard time; the sensor time is corrected according to the prediction result of the LSTM model. The actual time is separated from the time on the sensor, which simplifies the time synchronization process; through the selection of the time window, the consumption of computing resources is significantly reduced while ensuring the prediction accuracy; through the correction mechanism, high-precision synchronization is achieved while optimizing computing resources to ensure that the sensor time is consistent with the standard time.

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.

There are provided an Ethernet unit that performs transmission and reception of a packet with an O-RU, a time generation unit that generates a base time of a measurement device, a transmission time error insertion unit that inserts an error in a time generated by the time generation unit in a case of inserting a PTP error, and a reception time error insertion unit that inserts an error in a time which is notified by the Ethernet unit in a case of inserting a PTP error, in which the transmission time error insertion unit and the reception time error insertion unit add an error amount while gradually increasing the error amount to an offset value in a case where an offset-attached error addition test is performed, and perform the error addition test in a case where the error amount reaches the offset value.

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.