62results about How to "Time synchronization" patented technology

The invention relates to a cross-network time synchronization method oriented to AUTBUS and TSN fusion, and belongs to the field of network time synchronization. The invention aims to solve the problems that the traditional Ethernet cannot meet the time-sensitive application requirement and the scale of the TSN is limited and the like. According to the method, a time compensation value prediction algorithm is placed in an AUTBUS terminal, time delay values of all parts in the heterogeneous network are collected and predicted, and finally a prediction result is compensated to a local clock of the AUTBUS terminal, so that end-to-end time synchronization of the AUTBUS and TSN fusion network is realized. The method comprises the four steps of TSN intra-network time synchronization, gateway intra-network time synchronization, AUTBUS intra-network time synchronization and AUTBUS terminal time compensation, time delay data are predicted through a linear regression prediction algorithm, and synchronization precision and efficiency are improved. The method is suitable for the fields of intelligent manufacturing, industrial automation and the like, and an effective solution is provided for time synchronization of the heterogeneous network.

The invention relates to the technical field of intelligent robots, and provides a visual odometer measurement method and device, electronic equipment and a medium. Comprising the following steps: performing time synchronization on each sensor; an image sequence of the first sensor is obtained and preprocessed, and visual motion recovery is obtained; acquiring depth information of the environment through a second sensor, and performing point cloud fusion, feature registration and scale recovery to acquire visual motion recovery; and obtaining a visual odometer according to the visual motion recovery and the IMU motion between the image sequence frames. According to the method, the time of each sensor is synchronized, so that the time consumption uncertainty of data transmission is avoided; and point cloud fusion, feature registration and scale recovery are carried out, so that the problem of scale uncertainty of feature points is solved.

The invention relates to the technical field of cross-modal data processing and graph convolution, and discloses a cross-modal data decoupling method, characterization method and characterization system.The decoupling method comprises the following steps that S1, feature extraction is conducted, specifically, features of each modal data are extracted, and the features of different modal data are synchronized in the time dimension; and S2, feature decoupling: constructing a shared mapping module based on an attention mechanism, performing feature decoupling of different modal data, and outputting the decoupled modal features. According to the method, the problem that cross-modal information is difficult to accurately understand and process in the prior art is solved.

The invention belongs to the technical field of camera time synchronization, and discloses a camera time synchronization method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining relative time or absolute time in a time reference device in real time, converting the relative time or absolute time into corresponding coding information through a time coding rule, and transmitting the coding information to a server; the controller is used for adjusting the light source array to obtain light source array information after real-time adjustment, controlling the camera to shoot, enabling the camera to shoot a shot picture recording the light source array information after real-time adjustment, and decoding the light source array information after real-time adjustment by using a time decoding rule to obtain a shot picture recording shooting time; the light source array is adjusted through the relative time or the absolute time, and the light source array information after real-time adjustment is decoded to obtain the shot picture recording the shooting time, so that time synchronization is performed on the camera, and the time synchronization efficiency of the camera is improved.

The embodiment of the invention provides a time synchronization method applied to an electronic mechanical braking system and the braking system. The braking system comprises a main controller and at least one auxiliary controller. The first clock is arranged on the main controller; the at least one second clock is arranged on the at least one auxiliary controller in a one-to-one correspondence manner; the main controller synchronously sends a first level signal and a second level signal to at least one auxiliary controller at a first moment and a second moment respectively through a hard wire; and when the received second level signal is different from the first level signal, the at least one auxiliary controller sets the at least one second clock to be the same as the first clock. The main controller and the auxiliary controller are connected through the hard line, the hard line is used for replacing a CAN line to carry out time synchronization, the load overhead of a CAN bus is reduced, time synchronization is carried out through the change of a level signal, a CPU is not needed for calculation, CPU resources are not occupied, the CPU load is reduced, and the synchronization precision is improved.

The invention discloses a node time synchronization and distance measurement method and system of a wireless sensor network, which are used for solving the technical problem of poor time synchronization and distance measurement precision caused by the node time synchronization and distance measurement technology of the existing wireless sensor network. The method comprises the following steps: when a passive node in the wireless sensor network receives a first synchronization signal sent by an active node in the wireless sensor network, the passive node determines first observation data according to the first synchronization signal and sends the first observation data to the active node based on a preset communication condition; and the active node screens the first observation data and the second observation data, determines target observation data, and outputs a target filter state vector for realizing time synchronization between the active node and the passive node in combination with the prediction filter state vector, the prediction state covariance matrix and the preset initial observation noise covariance matrix, constructing a node Euclidean distance matrix according to the state vector of the target filter;

The invention discloses a direct current voltage transformer frequency response test method and system based on wireless synchronization, and the method comprises the steps: configuring a test host and a wireless sub-machine, and carrying out the wireless synchronization of the test host and the wireless sub-machine; the test host collects a standard signal output by the standard source, and the wireless sub-machine collects an optical fiber digital signal output by the tested DC voltage transformer; the test host detects the fundamental frequency of the standard signal and sends the standard signal to the wireless sub-machine; the wireless sub-machine performs interpolation on the acquired optical fiber digital signal according to the fundamental wave frequency so as to adjust the sampling frequency; the test host performs frequency spectrum calculation on the standard signal, and sends the harmonic order needing to be tested to the wireless sub-machine; the wireless sub-machines return the corresponding actual spectrum parameters to the test host; and the test host executes a direct-current voltage transformer frequency response test according to the actual frequency spectrum parameters. The method has the advantages of simplicity in implementation and operation, low test cost, high test efficiency and precision, safety, reliability and the like.

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 embodiment of the invention provides a dynamic encryption verification method and device based on a time network protocol, and the method comprises the steps: collecting historical encryption verification data, carrying out the iteration number label adding operation of the historical encryption verification data, inputting a key encryption algorithm iteration number label into a preset random forest model, and carrying out the model training, according to the model prediction result after model training and a preset feature importance analysis algorithm, determining corresponding important encryption verification features, performing model training on the random forest model according to the important encryption verification features, and determining a corresponding key encryption algorithm iteration model; determining a corresponding number of iterations of the key encryption algorithm according to the network state and a key encryption algorithm iteration model; the decoding data and the number of iterations of the key encryption algorithm are input into a preset key encryption algorithm, a corresponding key pair is determined, and time synchronization between the user side and the server side is achieved according to the key pair, so that the reliability and efficiency of time network protocol key authentication can be improved.

The invention provides a distributed SAR time-frequency synchronization method and device. The method comprises the following steps: determining a local pseudo range of a satellite in a distributed SAR system relative to a Beidou satellite navigation system; and adjusting a reference frequency source signal corresponding to a satellite in the distributed SAR system based on a Beidou satellite navigation system to obtain a reference frequency source signal. And the first satellite opens the inter-satellite link according to the reference frequency source signal corresponding to the first satellite. And sending a first local pseudo range corresponding to the first satellite to a second satellite in the distributed SAR system based on the inter-satellite link. A clock difference of the second satellite relative to the first satellite is determined based on the second local pseudorange and the first local pseudorange. And adjusting the frequency of a voltage-controlled constant-temperature crystal oscillator of the second satellite based on the clock difference. According to the method provided by the invention, time-frequency synchronization between satellites can be realized simply and efficiently at low cost.

The invention discloses a synchronous display method of AR split glasses and the AR split glasses. The AR split glasses comprise glasses, a control box and a data line. The data line is used for connecting the glasses and the control box. The method is applied to the control box. The method comprises the following steps: detecting that the glasses are connected with the control box through a data line under the condition that the glasses are disconnected from the control box; receiving a plurality of synchronization signals periodically sent by the glasses; calculating a first time difference between a first time when the glasses send the first synchronization signal and a second time when the control box receives the first synchronization signal; the synchronization signal is any one of a plurality of synchronization signals; the first time difference is a time difference corresponding to the first synchronization signal; optimizing the first time difference by using a setting algorithm, and adjusting the first time by using the optimized first time difference to obtain target time; and sending the image frame corresponding to the target time to the glasses, so that the glasses display the image frame. The picture tearing problem is avoided, and picture synchronous display is achieved.

The invention provides a distributed Internet of Things simulation system based on time synchronization, event driving and a message bus, and the system comprises a simulation model which is used for simulating different types of Internet of Things equipment or communication entities; the model management system is used for managing and controlling the life cycle, configuration and version management of the simulation model so as to ensure that the system adds, deletes or modifies different simulation models; the time synchronizer is used for ensuring that all nodes in distributed simulation keep a unified time reference so as to ensure the sequence and synchronous execution of events; the message bus is used for transmitting messages, events and data among the simulation nodes so as to ensure real-time communication and cooperation of each unit in the distributed system; and the front-end interface is used for monitoring a simulation process, operating equipment and checking simulation data in real time. According to the invention, the problem of low operation and maintenance efficiency of Internet of Things simulation software in the prior art can be solved.

This application provides a satellite synchronization method and apparatus based on a wheel-type formation satellite constellation. After acquiring the observation data and satellite status information obtained by the main satellite and each auxiliary satellite from the target GNSS navigation satellite, the method, during a preset first synchronization period, uses a preset time synchronization algorithm to process the observation data obtained by the main satellite and any auxiliary satellite to obtain the relative clock difference between the main satellite and that auxiliary satellite, thus achieving time synchronization. A preset spatial synchronization algorithm is then used to periodically process the satellite status information to obtain the attitude information of each satellite, achieving spatial synchronization. During a preset second synchronization period, the main satellite and each auxiliary satellite are controlled to send phase synchronization signals to each other before and after the radar echo reception window, obtaining the phase synchronization error between the main satellite and each auxiliary satellite, thus achieving phase synchronization. This method improves upon the problems of long imaging periods, low imaging accuracy, and narrow imaging range in satellite imaging processes.

The present invention discloses a distribution network differential protection method, system and distribution terminal in the field of distribution network technology. The method is executed by the distribution terminal, including: obtaining the reference time forwarded by the customer terminal device; exchanging data with the adjacent distribution terminal through the customer terminal device through the 5G deterministic network to collect complete information required for differential protection calculation; generating a data message by combining the reference time and the collected information required for differential protection calculation; transmitting the data message to the distribution management system through the 5G deterministic network, so that the distribution management system can perform differential protection calculation according to the data message; wherein the adjacent distribution terminal refers to a distribution terminal located on the same distribution line as the input end or output end of the current distribution terminal, and the information required for differential protection calculation includes at least the current sampling value flowing into and out of the distribution terminal and the time stamp information of the current sampling value. The present invention can improve the reliability of differential protection.

The invention discloses a high-precision time calibration method for spacecraft equipment, which comprises the following steps: step 1, after equipment needing high-precision time service is powered on and runs, the equipment performs accumulated self-punctuality according to an initial moment and an internal crystal oscillator, and updates whole-second time information and intra-second time information of maintenance time of the equipment; 2, the time service upper computer sends ETR second pulse signals strictly aligned with the whole second moment and whole second time information of the time code of the current second to the equipment in a fixed period per second; and step 3, the equipment completes local time updating according to the ETR pulse per second signal sent by the time service upper computer and the whole second time information of the current beat time code, and keeps synchronization with the time of the time service upper computer. The method is easy to implement, can overcome the defect that when a time service upper computer hard pulse ETR signal and time information serve as a time correction method in the prior art, time correction fails due to the fact that an upper computer signal breaks down, effectively reduces the risk of system function failure, and remarkably improves reliability and safety of spacecraft equipment time synchronization.

The application relates to a time synchronization method, system, device and computer readable storage medium, which comprises the following steps: taking the current time of a navigation controller as a reference time, time-synchronizing a bottom controller according to the reference time; acquiring time information of the time-synchronized bottom controller, time-synchronizing a laser radar sensor according to the acquired time information of the bottom controller; adding timestamp information in sensor information collected by the bottom controller according to the time information of the time-synchronized bottom controller, and adding timestamp information in point cloud data collected by the laser radar sensor according to the time information of the time-synchronized laser radar sensor. The application takes the current time of the navigation controller as the reference time, time-synchronizes the bottom controller and the laser radar sensor, synchronizes several different time systems to a unified time system, realizes data alignment and fusion, and guarantees accurate positioning of an automatic guiding vehicle.

The present application relates to the technical field of metrological test, in particular to a kind of dynamic tracking performance calibration system and method of adiabatic accelerating calorimeter, comprising: the surface temperature variation of the sample to be detected is simulated using programmable multifunctional signal source generator, and a kind of temperature rise curve type of the sample to be detected is set in advance, then when the temperature rise rate of adiabatic calorimeter is detected to reach the set threshold, it automatically enters adiabatic tracking mode;Real-time acquisition of sample temperature data and cavity temperature data, respectively generate target temperature curve and actual temperature curve, and the temperature rise rate of two curves at each time is calculated using filtering and central difference method;Based on target temperature curve and actual temperature curve, calculate tracking temperature difference and temperature rise rate error, and use tracking temperature difference and temperature rise rate error to analyze the dynamic tracking performance of adiabatic calorimeter.The present application is suitable for calibrating and evaluating the temperature tracking accuracy and temperature rise rate response capability of adiabatic accelerating calorimeter in adiabatic tracking mode.

The present disclosure provides a communication node wake-up method, system and automobile, and relates to the technical field of vehicle communication. The method comprises the following steps: after entering a device sleep mode, if a target receiving time window corresponding to a slave communication node is entered, enabling a receiving function to receive a wake-up frame from a master communication node in the target receiving time window, and entering a wake-up state; if the target receiving time window corresponding to the slave communication node is not entered, keeping the receiving function closed to keep the slave communication node in a sleep state. The present disclosure is used to solve the problem of device false wake-up caused by the wake-up frame of any communication node when the communication node enters a sleep mode in the prior art.

The present application relates to the technical field of material performance testing, and discloses a kind of test methods for evaluating the chemical solvent penetration resistance of reinforced plastic, comprising the following steps: constructing inverse transfer function to compensate platform lag, using historical strain data to predict the starting time of microcrack opening in the next cycle, combining platform inherent delay to calculate instruction sending time, based on stiffness attenuation rate calculated in real time to adaptively adjust the best disturbance frequency, using inverse transfer function to generate modified disturbance instruction and superimposed injection, deducting fluid viscous damping work previously calibrated from single cycle data to obtain effective dissipation density, determining failure end point based on the second derivative change of effective dissipation density sequence.The present application realizes the time synchronization of pressure wave and crack opening through prediction feedforward strategy, maintains deep penetration driving force using adaptive disturbance, and eliminates fluid damping interference through energy decoupling mechanism, improving the authenticity and result accuracy of stress-assisted solvent penetration test.

The invention provides a vehicle-mounted terminal time synchronization system and a synchronization method, the system comprises a plurality of domain controllers and a plurality of vehicle-mounted terminals, the plurality of domain controllers are mutually connected to form a vehicle-mounted Ethernet, the plurality of vehicle-mounted terminals are respectively connected to one of the plurality of domain controllers, each vehicle-mounted terminal comprises a physical layer, a plurality of domain controllers, a plurality of domain controllers and a plurality of domain controllers, the physical layer is synchronized with a master clock device through an Ethernet interface, and the physical layer is used for generating a whole-network absolute timestamp; the data link layer is connected to the physical layer and used for calling the whole network absolute timestamp generated by the physical layer; and the processor is connected to the data link layer and is used for calling a whole-network absolute timestamp corresponding to the vehicle-mounted terminal data through the data link layer when the vehicle-mounted terminal data is sent, packaging the vehicle-mounted terminal data and the whole-network absolute timestamp into an Ethernet message and sending the Ethernet message through the Ethernet interface. And time synchronization and multi-domain transmission of the vehicle-mounted terminal are realized.

The invention relates to information security, in particular to an anti-plug-in method for online auction quotation, which comprises the following steps that: a client performs time synchronization verification and calculates a 2FA dynamic code, and performs signing and data encryption operations at the same time; the client sends a service request to the server; the server verifies the service request sent by the client and performs data interaction with the client according to a verification result; according to the technical scheme provided by the invention, the defects of easy cracking and poor protection effect in the prior art can be effectively overcome.

The embodiment of the invention discloses a time synchronization method, a chip and computer equipment, and belongs to the technical field of computers. The method is applied to the chip, the chip comprises a first function module, a second function module and an on-chip bus, the first function module and the second function module are electrically connected with the on-chip bus, and the first function module is electrically connected with the second function module. The first function module obtains the transmission delay of the electric connection with the second function module; the first function module sends a time synchronization request to the second function module through electric connection, and the second function module receives the time synchronization request and updates local timing of the second function module based on a first time point carried by the time synchronization request. According to the embodiment of the invention, the method does not need to carry out the time synchronization through an on-chip total chip, can guarantee the accuracy of the time synchronization among a plurality of function modules, and improves the usability and efficiency of a chip.

The present application relates to a time synchronization method, a terminal device and a network device. The time synchronization method includes: the terminal device obtains timing advance TA information through a random access process; the terminal device uses the TA information for time synchronization. By triggering the random access process by the terminal device, it can be ensured that the terminal device can obtain valid TA information in various scenarios, perform propagation delay compensation, and perform time synchronization.

The present application relates to the technical field of intelligent dry ice production hydraulic control, a dry ice production hydraulic control method and system based on multi-sensor cooperation, the method comprising: confirming a dry ice production hydraulic control environment based on a dry ice production hydraulic control instruction, performing hydraulic pressure on the dry ice raw material based on a hydraulic cylinder, collecting data based on a multi-source sensing unit, time-synchronizing multi-source information to obtain synchronized multi-source information, analyzing the synchronized multi-source information based on an intelligent analysis and decision unit, calculating a target flow based on a working condition stage, calculating a compensation pressure based on a pipe cross-sectional area and the target flow, performing comparative analysis based on synchronized real-time pressure, synchronized output flow, the target flow and the target pressure, and obtaining a reversing valve control instruction based on the working condition stage. The present application can improve the precision, efficiency, reliability and energy utilization rate of dry ice production hydraulic control.

The embodiment of the invention provides a radio frequency processing method and system and a medium, and the method specifically comprises the steps that a main reader-writer generates a first synchronization signal according to the local clock frequency and time; the main reader-writer sends a first synchronization signal according to a first preset period; the slave reader-writer monitors the synchronization signal according to a first preset stage corresponding to the second preset period; the second preset period is a second preset multiple of the work period, and the second preset multiple is greater than the first preset multiple; and the slave reader-writer updates the local clock frequency and time according to the interception result so as to synchronize the clock frequency and time of the slave reader-writer with the clock frequency and time of the reader-writer where the interception result is located. According to the embodiment of the invention, synchronization between clock frequencies and time corresponding to the master reader-writer and the slave reader-writer can be realized.

A hybrid detection and ranging (HyDAR) system configured for detecting signals having a plurality of wavelengths is provided. The system comprises a laser light source which provides a laser signal; an aperture window; one or more steering mechanisms configured to guide the laser signals toward the aperture window, receive a first return light signal formed based on at least a portion of the laser signals provided by the laser light source, and receiving a second return light signal formed by light provided by one or more light sources external to the HyDAR system. The system further includes a multi-mode sensor including a light detection and ranging (LiDAR) sensor and an image sensor. The point cloud data and the image data at least partially implement temporal and spatial synchronization on the hardware level of the HyDAR system. The system further includes a controller configured to detect one or more degradation factors that affect performance of the HyDAR system.

The present application is applicable to the field of signal processing technology, and provides a signal processing method and a signal transmission system, the method comprising: obtaining sampling signals transmitted by multiple optical fiber transmission channels; determining the target wavelet basis function and the target decomposition layer number corresponding to each of the sampling signals; performing discrete wavelet transform on each of the sampling signals based on the target wavelet basis function and the target decomposition layer number corresponding to each of the sampling signals; performing autocorrelation function analysis on each of the sampling signals after discrete wavelet transform to obtain the time delay information of each of the sampling signals; aligning the timestamps of the multiple sampling signals based on the time delay information. Through the above method, time synchronization can be performed on signals transmitted through different transmission channels.

The present invention discloses a time synchronization method, device and medium for low-orbit satellites, which are applicable to the field of satellite communications. A first synchronization calibration is performed on the current satellite node according to the node time quality, and a second synchronization calibration is performed on the calibrated current satellite node through an improved RTT synchronization method to eliminate the delay difference; when each satellite node of the constellation network completes the time synchronization, the corresponding time synchronization maintenance strategy is executed according to the relationship between the node time quality corresponding to each satellite node and the preset conditions to achieve time synchronization of the low-orbit satellite. At the same time, the time synchronization maintenance strategy is added, so that in the case of communication interruption caused by a sudden loss of synchronization of a certain satellite or inability to locate and provide timing during a special period, time synchronization can be maintained autonomously, thereby improving the reliability of the low-orbit satellite communication system.

The application discloses an improved evidence theory multi-modal tunnel anomaly identification method, and belongs to the technical field of underground engineering safety monitoring; different modal data are collected in the robot inspection process, and the space-time synchronous registration of the modal data is realized through unified time stamp and external parameter calibration; laser radar three-dimensional structure features, visible light texture edge features and infrared temperature field features are respectively extracted, and basic probability distribution functions of the modes are constructed; a modal confidence coefficient and an environment adjustment coefficient are introduced to double-dynamically correct the data, a conflict adaptive attenuation mechanism is used to improve D-S evidence fusion rules, and the modal data fusion is realized; finally, the anomaly identification result and the early warning information are output based on the fusion trust function. The problems of low tunnel anomaly identification precision, weak environment anti-interference ability and high conflict information fusion loss in the prior art are effectively solved, the precision and stability of the tunnel anomaly identification in the complex underground environment are greatly improved, and the method has a good engineering application prospect.

The invention discloses a real-time distributed actual battlefield scene simulation control system, and relates to the technical field of real-time distributed simulation, and the system comprises three core modules: 1, a distributed architecture construction module for constructing a deployment architecture combining a central node and an edge node, accessing a hardware terminal and formulating a unified data interaction specification, the system comprises a first module, a second module, a clock synchronization and load monitoring module, a task migration execution module and a third module, wherein the first module is used for guaranteeing node time consistency through a user-defined synchronization mechanism, collecting load data, calculating a dynamic association load value and setting a load threshold value in combination with a training scale; the migration cost is quantified, the task with the minimum migration cost is preferentially migrated, data transmission specifications and space-time consistency are ensured, actual combat training requirements of different scales are met, and system load balance, real-time response and scene high fidelity are achieved through the content of the method.