24 results about "Time error" patented technology

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.

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 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 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.

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.

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 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.

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 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.

A virtual clock device, a time synchronization method, a device, equipment and a storage medium are disclosed, and relate to the technical field of time management and time synchronization. The device comprises a processor. The processor determines a frequency adjustment signal corresponding to a virtual clock based on a target time error between a target hardware clock and the virtual clock within a time synchronization period of the virtual clock and the target hardware clock. The processor resets a first time parameter of the virtual clock in a previous time synchronization period based on the frequency adjustment signal, obtains a second time parameter of the virtual clock, and writes the second time parameter into a shared memory. The processor reads the second time parameter from the shared memory in response to a time reading request of the virtual clock by an application program, and determines a current virtual time of the virtual clock based on the second time parameter and a time value of a hardware monotonic clock at a current time. The device can establish a high-precision smooth synchronization mechanism between the two time axes of the virtual clock and the target hardware clock, and the reading overhead is very low.

An apparatus including at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: sending at least one timing error, where the at least one timing error is for use in estimating a position of the apparatus.

The invention discloses a multi-channel TIADC time deviation calibration method. The method comprises the following steps: calculating a channel difference value between output values of adjacent channels of a multi-channel TIADC; obtaining a time error value according to each channel difference value, and obtaining a time error correlation vector by taking each time error value as an element; multiplying the time error correlation vector by a pre-designed error extraction matrix to obtain a sampling time mismatch value of each channel; performing iterative convergence on the sampling time mismatch value of each channel to obtain a mismatch estimated value of the channel; and compensating the output value of each channel according to the mismatch estimation value of each channel. The sampling time mismatch estimation method provided by the invention is low in resource consumption and is not limited by the number of channels, error estimation of all the channels can be carried out simultaneously, and the required convergence time is shorter under the condition of multiple channels.

The application provides a time error determination method of a measuring instrument, belonging to the technical field of data processing, to improve the accuracy of time error determination. The test system comprises a processing device, a synchronizer and a time pulse generator, the processing device, the synchronizer and the time pulse generator are connected with M measuring instruments to be tested, the synchronizer is connected with the time pulse generator, and the method comprises the following steps: the synchronizer triggers the test process to start; under the condition that the test process starts, the time pulse generator sends a first pulse signal to the M measuring instruments at t1, and sends a second pulse signal to the M measuring instruments at t2 after t1, and the interval between t1 and t2 is a preset time length t; under the condition that the test process starts, the processing device determines the time error of each of the M measuring instruments according to the time of the first pulse signal received by each of the M measuring instruments, the time of the second pulse signal received by each of the M measuring instruments and the preset time length t.

The application discloses a video synchronization method, a distributed system and a computer program product, the method comprising: taking the time of the master device as a time reference, synchronizing the local clock, vertical synchronization signal phase and the start time of the first frame of video of all slave devices based on the PTP protocol; when any device performs video frame decoding abnormally, sending a notification to all other devices in the distributed system to delete the video frame corresponding to the display timing; all devices in the distributed system dynamically adjust the picture update rate based on the accumulator cycle until the picture update rate is aligned with the display refresh rate, end the cycle, and display the decoded video frame according to the video frame display timing, so as to solve the problem that the time stamp is affected by the network signal and the timer is affected by the operation time error, resulting in the display of the master and slave devices being out of synchronization or there being picture tearing.

An apparatus including at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: receiving, by the apparatus, a request for capability information of the apparatus regarding at least one timing error for use by the apparatus in estimating a position of the apparatus; and sending the capability information of the apparatus.

There is provided a method for enabling time comparison and dynamic delay compensation of timing between a first node (A) and a second node (B) in a two-way time transfer network (N), which provides a delay compensation with improved ability to compensate for dynamic delays during for real-world network conditions The method comprises monitoring time information sent between the nodes and observations associated with delays caused by environmental effects associated with the transmission medium in the network that affects the timing, to derive at least two delay compensation factors for reducing time errors in the two way time transfer to compensate for static and dynamic environmental delays in the timing.

The application provides a high-precision synchronous clock method without PPS pulse, a device, equipment and medium, which comprises the following steps: acquiring time error information of an external clock source and a GPS clock and generating a time message; confirming a first time value and a second time value of the time message; the external clock source analyzes the time message at a first time point in response to a time request, obtains a third time value, obtains a first delay error of the intelligent power distribution terminal according to multiple time values, and confirms current time information of the GPS clock; acquiring a fourth time value at a second time point and arranging a time request message, sending the time request message to the intelligent power distribution terminal at a third time point to obtain a second delay error and confirm a first current time value of the time request message; writing the first current time value into a real-time clock of the intelligent power distribution terminal, and re-reading a second current time value. According to the technical scheme, the time synchronization accuracy can be improved, and the system anti-interference reliability can be improved.