19results about How to "Improve time synchronization accuracy" patented technology

The invention belongs to the technical field of data center network and clock synchronization, and discloses a dynamic time synchronization path optimization method and system based on topology awareness. The invention provides a closed-loop framework of state awareness-path optimization-resource assurance-dynamic adjustment and optimization: in the first stage, network topology, link load and PTP message performance data are periodically acquired through an SDN controller, and a global state view is constructed; in the second stage, the optimal path is dynamically calculated for the PTP synchronous flow through a multi-constraint optimization algorithm with the purpose of minimizing transmission delay jitter, and deterministic transmission is achieved in combination with bandwidth reservation and a priority queue; and meanwhile, a seamless switching mechanism of building first and disassembling second is introduced to adapt to the network state change in real time. On the basis of multiplexing existing hardware, the time synchronization error is remarkably reduced, the transmission stability and the dynamic adaptability are improved, microsecond-level time synchronization can be efficiently achieved, and the method is suitable for high-precision service scenes.

The invention discloses an automobile cabin software control method and system based on multi-mode interaction, and relates to the field of multi-mode data, and the method comprises the steps: S1, multi-source signal synchronous collection and timestamp calibration; a user voice instruction, a gesture track and eye fixation point information are collected in real time through a distributed sensor array; according to sensor data, a three-level synchronization architecture is combined with a PTP precise time protocol to achieve microsecond-level clock synchronization, a unified time service timestamp is embedded in a data packet header, and the timestamp error is controlled within + / -0.5 ms; s2, dynamic environment interference compensation; the method comprises the following steps: constructing an environmental noise perception model; the construction of the environmental noise perception model comprises the following steps: starting a regional strong light suppression algorithm for a strong light scene with the illumination intensity greater than 10,000 lux; activating a motion compensation module for a bumpy scene with a vertical acceleration greater than 0.3 g, and outputting an environment compensation multi-modal data stream; s3, analyzing time-space association semantics; and S4, confidence decision and instruction execution.

The invention discloses a Doppler frequency shift-based high-precision time synchronization method, which comprises the following steps that: a common node sends a time synchronization request message to a time reference node, and when the time reference node receives the time synchronization request message, the time reference node records the time when the time synchronization request message reaches an air interface and estimates the Doppler frequency shift of the time synchronization request message; the time reference node replies a time synchronization response message, and when the common node receives the time synchronization response message replied by the time reference node, the time when the time synchronization response message reaches an air interface is recorded, and meanwhile, the Doppler frequency shift of the time synchronization response message is estimated; and the common node solves the time synchronization error between the common node and the time reference node by using the Doppler frequency shift of the time synchronization request message and the time synchronization response message and the transmission delay of the time synchronization request message and the time synchronization response message, thereby realizing time synchronization. The problem of asymmetry of message propagation paths is solved, and the time synchronization precision of the mobile ad hoc network is improved.

The invention discloses a multi-core controller clock calibration method, device and equipment and a storage medium, and relates to the technical field of vehicles. The calibration reference time of the vehicle control processor is obtained through the vehicle-mounted wireless communication box and is synchronized to the MCU core to realize accurate time calibration, the vehicle-mounted wireless communication box and the local RTC chip of the MCU are calibrated by obtaining the network UTC time in the online state, and the real-time calibration of the vehicle control processor is realized by obtaining the network UTC time in the offline state. According to the off-line duration, confidence analysis is carried out on the calibration reference time called in the RTC chip, the calibration reference time in the current state is determined to complete clock calibration of the MCU core, after the MCU core completes calibration, the calibration time is immediately synchronized to the SOC core to complete multi-core time synchronization in the vehicle controller, and dual-core time consistency is ensured. The time synchronization precision of the vehicle control processor is improved, and the robustness of the system is enhanced.

The present invention provides a method for realizing a two-step mode of a precision time protocol transparent clock, which comprises: S1: when a PTP message is detected on a PHY / MAC, an arrival timestamp IngressTs is recorded, and the process proceeds to step S2; S2: the PTP message is parsed by a switching chip, and it is determined whether it is a Sync or DelayReq message, if it is, the message feature information and the residence time are stored in a FIFO of the switching chip, and the exit PHY / MAC records the departure timestamp EgressTs in the FIFO of the switching chip, and then the process proceeds to step S4, otherwise, the process proceeds to step S3; S3: the switching chip is determined whether the PTP message is a FollowUp or DelayResp message, if it is, the FIFO is searched according to the message feature information to obtain the residence time, and the residence time is modified to the message correction domain, and then the processed PTP message is forwarded to the PHY / MAC and the process proceeds to step S4, otherwise, the switching chip directly forwards the PTP message to the exit PHY / MAC, and the process proceeds to step S4; S4: the message is sent through the exit PHY / MAC.

The invention provides a collaborative data link mobile platform time synchronization method, which comprises the following steps that: S1, a slave station mobile platform sends an inquiry message to a master station mobile platform, and the master station mobile platform sends a response message to the slave station mobile platform; s2, the master station mobile platform performs correlation calculation on the inquiry message and a locally generated PN code, and obtains the arrival time of the inquiry message based on a calculation result; s3, the slave station mobile platform performs correlation operation on the response message and a locally generated PN code, and obtains the arrival time of the response message based on a calculation result; s4, calculating to obtain a clock difference of the slave station mobile platform relative to the master station mobile platform based on a round-trip transmission distance between the master station mobile platform and the slave station mobile platform, the arrival time of the inquiry message and the arrival time of the response message; and S5, the slave station mobile platform calibrates the local clock based on the clock difference. The method has the advantages of being suitable for long-distance and dynamic scenes, high in time synchronization precision, good in stability and high in anti-interference performance.

The application provides a time synchronization system and method based on a TDMA system wireless network virtual-real joint simulation, which comprises a physical network and a virtual network simulation system, time synchronization between multiple physical nodes of the physical network is completed through radio frequency signals, and wireless communication of the TDMA system is adopted; one of the physical nodes is a gateway node, the gateway node is provided with a first interface and a second interface, the first interface is used for generating a time slot pulse signal, and the second interface is used for generating a time slot numerical signal; the virtual network simulation system communicates with the physical network, and the virtual physical network system is provided with a third interface for receiving the time slot pulse signal and a fourth interface for receiving the time slot numerical signal; wherein the time slot pulse signal carries synchronization interrupt information, the time slot numerical signal carries time slot time information, and the virtual network simulation system realizes time synchronization with the physical network through the time slot pulse signal and the time slot numerical signal. The application has high time synchronization precision and low resource consumption.

The invention provides a multi-sensor original data synchronous acquisition system and method, and the system comprises a configuration management module which is used for analyzing a sensor configuration file; the acquisition processing unit is used for dynamically instantiating the sensor according to the analyzed sensor configuration file; and the time synchronization module is used for generating a nanosecond timestamp and carrying out time synchronization on the collected original data of the sensor. According to the technical scheme, various protocol sensors are compatible, and meanwhile the fidelity of collected data and the time synchronization precision are improved.

The invention discloses a time synchronization method and system for a narrowband communication signal among multiple devices, and the system comprises a signal calibration module which generates a single-tone signal with a specified frequency, configures an independent control network, and transmits a periodic pulse signal; a common GPS chip and a BD chip are arranged in the signal receiving module, and the signal receiving module is used for receiving GPS signals or BD signals, obtaining time and position information and outputting the time information to other modules for use; and the time synchronization module receives the time pulse of the signal receiving module to generate time information, is connected with a network cable of the signal calibration module for autonomous communication, and controls the signal calibration module to send a signal. According to the scheme, the time synchronization precision between the devices is greatly improved, and the synchronization precision between the devices can reach the nanosecond level.

The invention provides a CSAC-based miniature PNT system high-reliability clock synchronization method, and the method comprises the steps: firstly, obtaining a 1pps signal of a CSAC and a 1pps signal of a GNSS in real time, and calculating a clock difference signal; under the condition that the GNSS signal is effective, whether the clock difference signal is larger than a preset threshold value or not is judged, and if the clock difference signal is larger than the threshold value, a coarse adjustment function of the chip-level atomic clock is started; otherwise, performing the following fine adjustment operation; and if the 1pps signal of the GNSS fails, the system automatically starts a clock holding function, and the time precision of the CSAC is predicted and maintained through an extended Kalman filtering method, so that the relatively high time synchronization precision can still be maintained during the loss of the GNSS signal. Once the GNSS signal recovers, the system will exit the clock hold mode and perform time synchronization with the GNSS again. According to the invention, the clock synchronization problem between the CSAC and the GNSS is solved, so that the high-precision time synchronization of the system is ensured, and the reliability of the system is remarkably enhanced.

The invention provides an uplink information transmission method and device, and relates to the technical field of communication. The method comprises the following steps: acquiring a modulation signal corresponding to A-IoT uplink information to be sent to uplink information receiving equipment; generating an uplink pilot frequency code corresponding to the A-IoT uplink information based on at least one bit sequence, wherein the at least one bit sequence is used for mapping at least two rising edge hops or at least two falling edge hops on one OOK symbol; adding the uplink pilot frequency code to the modulation signal to obtain an uplink message corresponding to the A-IoT uplink information; and sending the uplink message to the uplink information receiving equipment through the PDRCH. Some embodiments of the invention are used for improving the time synchronization precision of uplink information receiving equipment in an A-IoT communication scene.

The present disclosure provides a method for time synchronization between base stations based on UWB, including: receiving synchronization data sent by a second base station relative to a first base station; updating a time sequence table of the second base station relative to the first base station based on the synchronization data; fitting a clock model of the second base station relative to the first base station according to the time sequence table; and synchronizing the time of the second base station with the first base station based on the clock model. By utilizing the technical solution of the present invention, multiple base stations can process data on the same time axis with less resource occupation and cost, and the time synchronization accuracy between base stations can be improved to 0.1ns, thereby improving the positioning accuracy of the system and enhancing the adaptability of the positioning system in complex environments.

The invention relates to the technical field of distribution network operation and maintenance management, and discloses a distribution network operation and maintenance management method and system based on multi-dimensional intelligent perception, and the method comprises the steps: constructing a distributed cooperative sampling perception architecture, collecting distribution network operation and maintenance data through multiple types of sensors, and carrying out the space-time alignment compensation of the distribution network operation and maintenance data through combining with a digital twin space-time coordinate system; establishing an electromagnetic interference self-adaptive filtering architecture to filter interference data, performing equipment characteristic decoupling of equipment type adaptation, performing decoding at a cloud side after encoding, and reconstructing an equipment core operation state; constructing a three-dimensional topological twin body of the distribution network, establishing a health assessment model to predict a degradation track, calculating a fault risk entropy, and substituting the fault risk entropy into a corrected life prediction result; constructing an operation and maintenance decision space in combination with the fault risk entropy and the distribution network three-dimensional topological twin state, and solving an optimal decision; and injecting the decision into the distribution network three-dimensional topology twinborn simulation verification security constraint, evaluating the fault risk entropy change, and feeding back and updating the health evaluation model and the decision engine.

This invention discloses an algorithm for improving time synchronization accuracy in a master-slave network topology. The algorithm comprises the following steps: S1, establishing a master-slave network topology; S2, exchanging messages to obtain four timestamps and calculating the master-slave clock offset and average link delay, sending an Optimize_Req message to the master clock; S3, selecting the optimal master-slave clock offset from multiple offsets and calculating the asymmetric link delay ratio for each synchronization; S4, if the current link delay is approximately symmetrical, the master-slave clock offset is used to update the slave clock; S5, if the current link delay is asymmetric, the clock offset estimate is obtained using the maximum likelihood estimation algorithm, and an Optimize_Resp message is sent to the slave clock to update it. This invention improves the PTP time synchronization protocol by using the above algorithm, adding two message transmissions. The master clock receives the synchronization results from multiple slave clocks, further performs filtering and optimization, and then sends the updated results to the slave clocks, allowing the slave clocks to adjust themselves.

The invention relates to a synchronous control system and method for a galvanometer and a linear array camera based on an FPGA (Field Programmable Gate Array). The method comprises the following steps of: 1, generating a unified clock for a galvanometer driving signal and a linear array camera triggering signal; 2, generating a galvanometer driving signal through a galvanometer scanning signal generation module; 3, corresponding data are generated through a camera trigger signal generation module, and linear array camera trigger signals are generated through a high-precision DAC module; 4, uniformly adjusting the pulse width, the period length and the relative phase of the galvanometer driving signal and the linear array camera triggering signal through the clock period count value; 5, compensating and correcting the output delay of the linear array camera trigger signal or the phase offset of the galvanometer drive signal; and step 6, outputting a galvanometer driving signal and a camera triggering signal at the same time through an FPGA output driving module, and realizing high-precision time sequence synchronization of galvanometer scanning and linear array camera acquisition. According to the invention, high-precision synchronization between galvanometer scanning and linear array camera acquisition is realized.

The invention provides a time synchronization device for multichannel insulation detection data, which is connected with a plurality of multichannel insulation detection units in a power data network and comprises a GPS (Global Positioning System) receiver, a PTP (Precision Time Protocol) clock and a local oscillator, the GPS receiver establishes communication with a specified satellite to receive a GPS time signal; the PTP clock generates a PTP clock signal based on a preset master clock server; the local oscillator fuses the GPS time signal and the PTP clock signal based on a preset adaptive fusion algorithm to obtain a preliminary fusion time signal, corrects the preliminary fusion time signal in combination with a preset time reference signal to obtain a time reference signal, and further synchronously issues the time reference signal to all the multi-channel insulation detection units; therefore, data acquisition synchronization of all the multi-channel insulation detection units is realized. According to the invention, the time synchronization precision can be improved.

The invention discloses a regional unmanned aerial vehicle dynamic time synchronization method and system, and relates to unmanned aerial vehicles and time synchronization, and the method comprises the steps: generating a clock reference signal as a frequency time reference benchmark of other composition units; modulating a first time synchronization message frame corresponding to the clock reference signal to generate a transmission enhanced radio frequency signal; receiving an enhanced radio frequency signal transmitted by a ground center, demodulating a first time synchronization message frame, and measuring an observed quantity after frame synchronization; forming a second time synchronization message frame according to the measurement time delay and the measurement time information of the unmanned aerial vehicle; analyzing the measurement time delay in the second time synchronization message frame and the measurement time information of the unmanned aerial vehicle to calculate an initial clock difference; performing unmanned aerial vehicle motion error correction on the initial clock error data to generate a corrected clock error result; and adjusting the clock reference signal synchronization of the unmanned aerial vehicle according to the clock error result. The method provided by the invention can improve the time synchronization precision between the loads of the air-based area navigation enhancement system.

This invention discloses a method and apparatus for transformer fault detection based on sound signals. The method includes: acquiring a target sound signal and a leakage flux signal of the transformer; determining the phase deviation between the target sound signal and the leakage flux signal based on the fundamental frequency of the target sound signal and the fundamental frequency of the leakage flux signal; determining the frequency coupling relationship between the leakage flux signal and the target sound signal; extracting the time-frequency features of the target sound signal; and determining the transformer fault detection result based on the phase deviation, frequency coupling relationship, and time-frequency features. This invention solves the technical problem of inaccurate fault detection in related technologies when using sound signals to detect transformer faults.