64results about How to "High time accuracy" patented technology

The invention relates to the technical field of data processing, and discloses a wind wave flow prediction method and system based on meteorological simulation. The method comprises the following steps: performing atmospheric mode simulation on initial condition data and boundary condition data to obtain sea surface wind field data and atmospheric parameter data; performing post-processing and interpolation on the sea surface wind field data and the atmospheric parameter data to obtain wind wave model driving force field data; carrying out wind wave model coupling and simulation on the wind wave model driving force field data to obtain wind wave prediction result data; performing ocean current model coupling and simulation on the wind wave prediction result data and the wind wave model driving force field data to obtain ocean environment prediction result data; and performing data fusion and data assimilation processing on the marine environment prediction result data, the storm prediction result data and the storm model driving force field data to obtain storm flow prediction data, thereby improving timeliness and accuracy of storm flow prediction based on meteorological simulation.

The invention relates to the technical field of satellite time service, and discloses a Beidou anti-interference deception time service method and system based on multilayer detection, and the method comprises the steps: receiving a multi-band signal of a satellite, and recording a noise parameter; performing time frequency domain feature extraction on the multi-band signal, and performing weighted fusion on the extracted time frequency features to obtain a comprehensive feature vector; and establishing a conjoint analysis model, detecting an abnormal signal according to the comprehensive feature vector, performing time calculation on the detected real signal, and outputting time information. According to the method, efficient discrimination and accurate time service output of abnormal signals are ensured, the time service accuracy and stability of a Beidou system in a complex interference scene are remarkably improved, and a reliable time reference is provided for key industries.

The invention discloses a network security and situation awareness equipment data monitoring and early warning system for a centralized control system, and relates to the technical field of equipment situation monitoring, and the monitoring system monitors the risks in the aspects of time synchronization, port activity, electronic element corrosion, part supply chain and memory resource management of equipment in real time. And an alarm is given out in time by rapidly flickering the warning lamps with different colors. And the strategy module automatically generates corresponding coping strategies according to different early warning alarms, such as triggering of a time synchronization mechanism, blocking of abnormal ports, arrangement of equipment maintenance, replacement of parts, adjustment of memory allocation and the like. The comprehensive management scheme not only can effectively prevent system faults, but also can ensure that actions can be taken quickly when abnormity occurs, so that potential safety hazards and operation interruption are reduced. Through automated risk management and response, the system facilitates the improvement of the reliability of device operation and the security of the network.

The invention discloses a fault location method based on primary and secondary fusion complete pole-mounted circuit breakers, and relates to the field of power distribution network fault judgment, and the method comprises the following steps: selecting one pole-mounted circuit breaker between pole-mounted circuit breakers of a power transmission line as a master device, and taking the other pole-mounted circuit breakers as slave devices; the main equipment is configured to be a pole-mounted circuit breaker with the best 4G / 5G signal or a pole-mounted circuit breaker closest to the main station; optical fibers are connected among the pole-mounted circuit breakers and ad hoc networks are formed; the pole-mounted circuit breakers are subjected to time synchronization through optical fibers. When the device is applied, devices on the whole line are cascaded through optical fiber communication, ultrahigh time precision is provided, the fault distance measurement accuracy is improved, the network safety problem is completely eradicated in an ad hoc network mode, the device is not affected by networks and regions, and active fault detection and fault distance measurement are achieved by actively sending pulse signals.

The invention relates to a time-resolved spectral measurement method, device and equipment based on a multi-event time-to-digital converter, and a medium, and the method comprises the steps: carrying out the histogram statistics of photon signals of different time responses in each column of single-photon avalanche diodes in different laser pulse periods through the multi-event time-to-digital converter, the photon signal distribution of the photon signal of the specific wavelength corresponding to each column of single-photon avalanche diodes in different laser pulse periods is determined; the multi-event time-to-digital converter carries out delay combination on photon signal distribution in different laser pulse periods so as to determine a photon lifetime curve corresponding to the photon signal of the specific wavelength of each column of single-photon avalanche diodes. And integrating the photon lifetime curves corresponding to the photon signals of the specific wavelength of each column of single-photon avalanche diodes so as to construct the time-resolved spectrum of the sample to be detected. According to the invention, counting loss or time error caused by dead time can be reduced.

The invention relates to the technical field of power distribution and utilization and communication, in particular to a multi-source wide-area power distribution and utilization terminal time correction method and device, electronic equipment and a chip. The time correction method comprises the steps that a multi-source fusion power distribution and utilization terminal obtains reference time service time based on a preset reference time service source or based on multiple different time service sources, a time service deviation value between the reference time service time and the time service time of the to-be-corrected time service source is calculated, a time service time optimization parameter is determined according to the time service deviation value in combination with a moving average filtering algorithm improved based on Pearson's correlation, and the time service time optimization parameter is used for correcting the time service time of the to-be-corrected time service source. When time service time optimization parameters are determined, a moving average filtering algorithm which is improved based on Pearson's correlation is combined, and the correlation between data is considered, so that noise can be effectively filtered, time deviation can be smoothed, the accuracy of time service correction is improved, and the high-accuracy time service synchronization requirement of the power distribution and utilization terminal in a power system is met.

The invention relates to the technical field of aircraft brake systems, in particular to a multi-actuation structure all-electric brake control method. By adopting software and hardware platform development, the provided multi-actuation structure all-electric brake control method and strategy are based on the software and hardware platform, the force response time is prolonged, the control precision is improved, the brake efficiency is improved, synchronous control of a motor is ensured, reasonable degradation use is formulated, and normal use can be ensured when an all-electric brake system breaks down once; and the secondary fault can be safe and reliable, so that the operation reliability of the brake system is effectively improved, and the use safety of an airplane is effectively improved.

The invention discloses a single Beidou global precision time service method and system based on broadcast ephemeris, and the method comprises the steps: obtaining broadcast ephemeris data and satellite observation data transmitted by a Beidou satellite, and carrying out the analysis, and obtaining a real-time satellite orbit and a real-time satellite clock error; calculating an actual spatial distance error value of last time service of the broadcast ephemeris according to difference values between the real-time satellite orbit and the real-time satellite clock difference and a Beidou satellite precision product published by international GNSS service, and estimating an estimated spatial distance error value of the time service according to the actual spatial distance error value of the last time service; the satellite observation data and the space distance error estimation value are substituted into a broadcast ephemeris single Beidou PPP time service model based on the space distance error, and the receiver clock error is corrected; and carrying out clock taming according to the corrected receiver clock difference, and sending a tamed clock signal to the Beidou satellite receiver, so that the Beidou satellite receiver outputs corrected time information, and precise time service is completed. The method is higher in precision and better in stability.

The present invention provides a method, device and relay protection device for determining a timestamp, wherein a first component corresponds to a counter, a comparison register and a crystal oscillator, and the method comprises: if it is identified that the first component performs a first operation for a first message, a first time is determined according to a first current value of the counter and a current value of the comparison register, the first time is used to represent the time of the target time accuracy of the first component when performing the first operation, the target time accuracy is higher than the reference time accuracy, the reference time accuracy is the highest time accuracy that can be determined by the first component, the update period of the counter value is equal to the oscillation period of the crystal oscillator, the value of the counter is equal to the value of the comparison register every time a reference time accuracy passes, and the update period of the value of the comparison register is 1 reference time accuracy; the target time for the first component to perform the first operation is determined according to the first time.

The invention provides an automatic feature vector extraction method for ultrasonic binary gas sensors, which comprises the following steps of: constructing an ultrasonic feature vector extraction system, and connecting ultrasonic binary gas sensors which are connected in sequence into the ultrasonic feature vector extraction system; introducing gas with known concentration into the ultrasonic feature vector extraction system to control the concentration of gas in the ultrasonic binary gas sensor, and extracting a feature period amplitude threshold value and a feature period flight time compensation value in batches; according to the extracted characteristic period amplitude threshold value, the ultrasonic wave flight time is calculated, and therefore the target gas concentration is calculated. According to the invention, by extracting the characteristic period amplitude threshold value and the characteristic period flight time compensation value of the ultrasonic characteristic vector, matching can be carried out according to the transducer performance of each ultrasonic binary gas sensor, so that the effectiveness of the characteristic period in the detection gas concentration measuring range is ensured; and the influence of environmental noise and noise in an ultrasonic binary gas sensor circuit is effectively reduced.

The present application belongs to the field of rocket launch measurement and control technology, and particularly relates to a method and system for timing the separation of a rocket connector. The method comprises: collecting and preprocessing a separation trigger signal generated when the rocket connector separates from the rocket body; identifying the first generation time of the separation trigger signal based on the preprocessed separation trigger signal; determining the separation start time using the first generation time as a reference; simultaneously receiving a positioning signal of the rocket connector and using the disappearance time of the positioning signal as the separation end time; obtaining the separation duration based on the difference between the separation end time and the separation start time; storing the separation start time, the separation end time, and the separation duration; comparing the separation duration with a preset standard duration; generating a timing report and sending a timing completion instruction; and completing the timing of the separation of the rocket connector. The present application achieves timing of the separation of the rocket connector without the need for additional on-rocket equipment, has strong anti-interference capability, and has high timing accuracy.

The utility model provides an air quality detector, including main casing and the top cover of being connected in the top of main casing, be equipped with a plurality of independent chambers for installing sensor in main casing, and the part of main casing is directly opposite sensor is evenly distributed with a plurality of air inlet hole, be equipped with a plurality of interval setting ridge between top cover and main casing to make the clearance between the periphery of top cover and main casing form the flow guide groove. The utility model discloses a flow guide groove is arranged in the periphery of top cover, and the air inlet hole is used for air inlet in the position of corresponding sensor in lower part, not only makes the air even flow, avoids the airflow dead angle and retention, improves the response time and measurement accuracy of sensor, also ensures internal gas flow unobstructed, reduces the internal and external pressure difference, promotes the detection accuracy, through setting up independent detection chamber, different sensor module is isolated, and each sensor is equipped with independent detection chamber, prevents the cross interference between sensor, ensures each sensor independent work, improves the independence and reliability of measurement data.

The invention relates to the field of timers, and discloses a double-clock-driven high-precision timer and a timing method thereof, and the method comprises the steps: a slow clock test module tests the frequency ratio of a fast clock to a slow clock; the error statistics module accumulates the decimal part of the frequency ratio when the system is switched to the sleep state, and outputs an error correction mark to the timing module when the accumulated value is greater than or equal to 1; when the system is in a working state, the timing module adds 1 on the rising edge of each fast clock; when the system is in a sleep state, if the timing module does not receive an error correction mark, the timing module carries out timing at each slow clock rising edge to increase an integer part of a fast and slow clock frequency ratio; and if the timing module receives the error correction mark, the timing module adds 1 on the basis of the rising edge of the current slow clock and the integer part of the frequency ratio of the fast and slow clocks increased in timing, so that the error is reduced to the minimum, the influence of the error on the timing precision is greatly reduced, and the timing precision of the timer is improved.

The present invention relates to a high counting rate alpha particle detection method for accompanying particle imaging of a fusion neutron generator, which can effectively improve the measurement counting rate and timing accuracy of the accompanying particle imaging system of a fusion neutron source. The method comprises: by setting a barrier layer of a semiconductor detector, the thickness of a detection sensitive area, and thinning the thickness of an electrode and a substrate, the energy deposition of interference particles in a deuterium-tritium neutron source in the sensitive area of ​​the detector is reduced, and the proportion of energy deposition of accompanying alpha particles in the sensitive area of ​​the detector is increased, so that the amplitude of the current pulse signal output by the detector is proportional to the particle deposition energy; a current sensitive amplifier is used to amplify and reduce noise on the pulse signal output by the detector, and a narrow width voltage signal proportional to the current signal of the detector is output; a leading edge timing discriminator is used to time the pulse leading edge of the amplified voltage signal, and a reasonable trigger threshold is set to eliminate interference particle signals, so that only accompanying alpha particle timing signals are obtained.

The invention relates to the technical field of power distribution and utilization and communication, in particular to a power distribution and utilization network timing method, device, system and chip based on multi-mode communication, and the timing method comprises the following steps: a timing node and a timed node are respectively located on the same layer, adjacent layer or cross-layer, and first timing information and second timing information are obtained, and then performing time correction on the node to be subjected to time correction based on the first time correction information and the second time correction information. According to the invention, the concept of a reference node is introduced, the reference beacon sent by the reference node and simultaneously received by the time calibration node and the calibrated node is taken as the reference moment, and the time values which are recorded at the reference moment and are counted by the local clock are respectively taken as the first time calibration information and the second time calibration information; or the specified zero-crossing time which is relatively stable in position, predictable, high in repeatability and easy to detect is used as the reference time, so that the time correction precision of the power distribution and utilization network node during clock synchronization is effectively improved, and the reliability and the stability of the whole power distribution and utilization network are improved.

The invention relates to a method and equipment for capturing a cold start long code signal of a satellite navigation receiver, and a medium. According to the method, for the three-dimensional search process of different satellites, carrier frequency and code phase confronted by long code signal capture, a minimized initial list of satellites to be captured is generated, the search space of different satellites is greatly compressed, and after receiver local time correction is carried out through the first satellite captured in the list, the time of the satellite to be captured is corrected. And residual satellite parallel acquisition is carried out, so that cold start time consumption of the receiver can be effectively reduced, and rapid acquisition of the cold start time length code signal of the receiver is realized.

This application provides a printing timing control method, a printer, a program product, and a storage medium, relating to the field of electronic digital data processing. Utilizing a double-buffered structure of a character buffer and a transmit character buffer, the generation process of print data is physically isolated from the hardware transmission process. This avoids the serial dependency of waiting to transmit and transmitting while waiting to generate, as found in related technologies. It allows the main control module to pre-generate subsequent data and store it in the first-level cache during the hardware transmission intervals. This smooths out fluctuations in data generation time caused by differences in image complexity and avoids hardware stalls caused by computational delays.

The invention relates to the technical field of time frequency transmission, in particular to a PTP and SDH cross-network time service method and device, an SDH overhead channel is used for transmitting a PTP time signal, compared with an E1 service channel, the overhead channel is fixed in position in an SDH frame structure, is not influenced by branch pointer adjustment and is small in transmission delay jitter, meanwhile, PTP messages are not directly transmitted, and the transmission efficiency is improved. The PTP protocol is converted into a simplified time service protocol and then is transmitted by using an SDH overhead channel, so that the bandwidth occupation is reduced, the time synchronization frequency can be improved, the time service precision is improved, in addition, a time signal transmission path is more flattened, a multi-layer communication protocol nesting and a communication protocol conversion buffer area required by directly transmitting the PTP protocol are avoided, and the transmission efficiency is improved. According to the invention, the transmission delay jitter is reduced, the time service precision is improved, and the technical problem that the time service precision is seriously degraded when the PTP time signal crosses the SDH network for long-distance transmission in the existing scheme is solved.

The embodiment of the present application discloses a satellite timing method, apparatus, terminal device and storage medium, wherein the terminal device is connected to a base station in communication, and the terminal device and the base station correspond to multiple co-viewing satellites, and the method comprises: determining the first ionospheric delay and the second ionospheric delay respectively corresponding to the multiple co-viewing satellites; judging whether each co-viewing satellite is a target satellite available for timing according to the first ionospheric delay and the second ionospheric delay respectively corresponding to the multiple co-viewing satellites; determining the clock of the terminal device based on the first satellite data and the second satellite data corresponding to the target satellite. Implementation of this embodiment can improve the timing accuracy of satellite timing.

According to the long-distance high-precision time service system and method based on the time-triggered Ethernet, absolute time synchronization of one master and multiple slaves in a domain is achieved on the basis of being compatible with the standard of the time-triggered Ethernet, the system and method can be used for the single time reference of the whole network, a plurality of time synchronization master nodes can also be arranged according to subsystems, and the time synchronization efficiency is improved. The subsystems use respective time reference sources and time formats and do not interfere with one another; the redundancy time synchronization based on the priority can be conveniently realized only by deploying a plurality of time synchronization master nodes using the same time format in the whole network, and a plurality of time reference redundancies can be set and work simultaneously, so that the synchronization reliability is improved.

The invention relates to a train clock synchronization control method and device based on NTP. The method comprises the steps that NTP request messages are sent to an NTP server side every first duration; receiving an NTP response message to obtain NTP time information; if the difference between the NTP time information and the operating system time exceeds a second duration, synchronizing the operating system time as the NTP time information; and issuing the operating system time to a subsystem hung under the physical network port, so that the subsystem synchronizes the time of the subsystem itself as the operating system time under the condition that the difference between the operating system time and the time of the subsystem itself exceeds a third duration. On one hand, the transmission delay of a clock message in an Ethernet link is eliminated, and on the other hand, a time synchronization control strategy between the central control unit and the switch and a time synchronization control strategy between the switch and a sub-system hung below are set, so that the time calibration precision of the whole vehicle can be effectively improved on the premise of not increasing the functional complexity of the sub-system; and the recorded time of different systems of the train is consistent.

The present application relates to the technical field of aerial bomb fuze, and discloses a novel aerial bomb fuze clockwork mechanism with rotation speed control, which comprises a gear train, a rotor prime mover body, a safety device, a lower check ring and a rotor, characterized in that the safety device is fixed on the shaft of the gear train by the lower check ring, the safety device is provided with gear teeth and is engaged with the output wheel in the gear train, and the safety device is driven to rotate by the output wheel; the constant speed governor is located between the gear train and the toothed disc, the toothed disc is fixed with the bushing through riveting and is fixed on the central shaft by the upper check ring; the other end of the anemometer shaft is connected with the rotor seat through screw threads, the rotor seat can rotate relative to the time mechanism shell and drives the anemometer to rotate; and the rotor is fixed on the rotor seat. The present application can improve the timing accuracy, prevent the safety from being released too early, better protect the safety of the airplane and the pilot, has certain overload resistance, and when the overload reaches 20G, all the internal parts can remain stable and will not be damaged.

The invention discloses a time reference correction system, which comprises a clock initialization module and a virtual clock module, and is characterized in that the clock initialization module is connected with the virtual clock module; the clock initialization module comprises a GPS device, a 5G communication module, an RTC clock, a counter capture channel, a credibility calculation module, a priority selector and an oscillator. The invention further comprises a clock establishment method of the time reference correction system, the composition of the system is improved and optimized, based on an embedded system scheme, a new time reference correction system is formed in a software and hardware combination mode, a GPS and a 5G time service source are combined, the time service jitter behavior generated due to environment willing during independent GPS time service is eliminated, and the time service accuracy is improved. The method has the advantages that no accumulated error exists, no jitter error exists in a local vibrator, a periodic quasi-local oscillator is calibrated through a GPS time service source or a 5G network time service source, and local time and coordinated world time are kept synchronous.

The invention relates to the technical field of particle size recognition, and discloses a particle size recognition method and device for nano metal powder, and the method comprises the steps: obtaining a network recognition parameter matched with a suspension medium; when the network identification parameters are generated, constructing a standard suspension sample by taking a suspension medium as a benchmark, and adding a plurality of different medium redundancies to the suspension medium so as to construct a plurality of groups of different comparison suspension samples; determining the current environment characteristics of the suspension sample, analyzing the environment characteristics, and generating an environment label corresponding to the suspension sample; taking the environment label as an auxiliary parameter, taking the network identification parameter as a main body parameter, and constructing a particle size identification model suitable for the suspension sample; and identifying the particle size of the nano metal powder in the suspension sample through the particle size identification model. According to the technical scheme provided by the invention, the recognition precision of the grain size of the nano metal powder can be improved.

The present application discloses a distributed collaborative simulation method, device, equipment and medium for satellite systems. The method includes: synchronously starting the clock pulse cards of M simulation machines, and transmitting pulse signals through the clock pulse cards; when the synchronized node receives the pulse signal, executing a simulation operation through the synchronized node, and writing the current total simulation steps of the synchronized node into the shared memory corresponding to the corresponding simulation machine; reading the shared memory of the corresponding simulation machine in real time through the distributed simulation node, and when the N current total simulation steps read in the shared memory are consistent, determining that the current one-step simulation operation of the corresponding simulation machine has been completed, and writing the current total execution steps of the corresponding simulation machine into the VMIC reflection memory card through the distributed simulation node; when the M current total execution steps in the VMIC reflection memory card are consistent, determining that the current one-step simulation operation of the distributed simulation system has been completed.

The present application belongs to the field of measurement technology, and discloses a method, device and system for measuring the synchronization error of a timing clock. The method comprises: obtaining point cloud data collected by the laser radar during the reciprocating swing of the laser radar, and recording each time when the photoelectric sensor is irradiated by the laser radar, and comparing the timing time data of the GNSS receiver to obtain a first time series; determining a target cloud point corresponding to a light-transmitting hole in the point cloud data to obtain the acquisition time data of the target cloud point to form a second time series; the acquisition time data of the target cloud point is calculated by the laser radar according to the timing time data of the GNSS receiver under test; calculating the timing clock synchronization error between the laser radar and the GNSS receiver under test according to the time difference between each time data of the first time series and the second time series; thereby being able to simply and conveniently measure the timing clock synchronization error between the laser radar and the GNSS receiver.

The invention belongs to the technical field of iron core grounding current monitoring of transformers, and particularly relates to an iron core grounding current recording method based on precise time synchronization. Comprising the following steps: collecting a current signal through an iron core and a clamp grounding current sensor; time deviation caused by RTC is calibrated continuously in the collection process; performing cyclic sampling and calculation on an output signal of the sensor, sending total current and multiple harmonic waves obtained by Fourier calculation to a display end of an upper computer, and starting fault recording when the value of the total current meets a fault judgment threshold value; when it is judged that a fault occurs, an accurate time mark is provided through an accurate time synchronization function, reserved historical data and collected real-time data are spliced into a wave recording graph during the fault period, and the wave recording graph is backed up and transmitted to a display end of an upper computer to be stored and displayed. According to the invention, some fault phenomena which are short in duration and rapid in generation and disappearance can be effectively monitored, and the change trend of iron core and clamp current when faults occur can be effectively monitored.

The invention discloses a system and method for atomic nucleus spinning pointing control and precession signal measurement, and the system comprises a radio frequency generator, a radio frequency amplifier, a single-pole double-throw switch, a nuclear magnetic resonance coil, a signal processing module, a DAQ data collection system, an upper computer, and a time reference module. The time reference module is respectively connected with the DAQ data acquisition system, the signal processing module and the radio frequency generator, the radio frequency generator is connected with the radio frequency amplifier, the radio frequency amplifier, the nuclear magnetic resonance coil and the signal processing module are all connected with the single-pole double-throw switch, the upper computer is connected with the DAQ data acquisition system, the DAQ data acquisition system is connected with the signal processing module, and the signal processing module is connected with the single-pole double-throw switch. The DAQ data acquisition system outputs TTL control signals to the signal processing module, the single-pole double-throw switch and the radio frequency amplifier. The device has the advantages that accurate control of nuclear spin pointing to the 360-degree range is achieved, and integration of signal receiving and transmitting is achieved.

The invention provides a time service system based on double Beidou receivers and a time service precision analysis method, and relates to the technical field of time service, a pair of Beidou receivers is used for receiving satellite signals and outputting original observed quantity messages and time messages, an SOC processor receives and processes the original observed quantity messages and the time messages, and the time service precision analysis method is used for analyzing the time service precision of the Beidou receivers. Data values such as a carrier-to-noise ratio, an elevation angle, a phase residual error value, a satellite PDOP information value and the number of available satellites in the message are analyzed and calculated; then, a local rubidium atomic clock is used as a reference, and phase deviation values between the receivers and the rubidium atomic clock and between the receivers are calculated; and finally, through a triangular cross phase deviation comparison analysis method, the influence of abnormal phase jump, channel delay, internal noise and multipath effect of the receiver on the time service precision is effectively eliminated, and phase and frequency deviation correction values are obtained, so that the time service system can automatically calibrate the system core time and correct the phase and the frequency deviation, and the time service precision is improved. And outputting a high-precision time service signal and a frequency signal.

The present invention discloses an autonomous integrity monitoring method, device, equipment and storage medium for an advanced timing receiver, the method comprising: constructing a fault subset, smoothing pseudorange observation values ​​according to the carrier phase of the receiver to obtain a prior residual, using integrity support information and integrity parameters broadcast by the Beidou satellite-based augmentation system to calculate the residual weight matrix of the pseudorange, using a weighted least squares estimator to estimate the timing solution of the full-view subset composed of all visible satellites and the timing solution of all fault subsets; performing fault detection based on solution separation hypothesis detection for each fault-tolerant timing solution and a chi-square test for the full-view timing solution; in the case where the fault detection passes, calculating the timing protection level according to the integrity risk budget, and determining the availability of the timing service. The present invention eliminates the largest error source in the timing process, the ionospheric error; and adopts multi-constellation signals to greatly enhance satellite geometry and observation value redundancy.