14results about How to "Time synchronization" patented technology

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 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 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 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.

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 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.

This invention discloses a logistics monitoring system based on OBD devices, belonging to the field of logistics monitoring and big data analysis technology. The system includes: a data acquisition module, a data preprocessing module, a big data coupling analysis module, an intelligent adjustment module, and a storage module. This invention achieves full-dimensional data coverage and synchronization by constructing a collaborative acquisition system between OBD devices and multi-regional IoT sensors; big data coupling analysis generates fused feature vectors to support decision-making; and based on energy consumption optimization algorithms and closed-loop feedback mechanisms, it achieves coordinated optimization of the vehicle's environmental control and energy consumption, ensuring that instructions are adapted to the vehicle system, dynamically adjusting the model, and achieving data-driven precise control and energy efficiency optimization.

The invention relates to the technical field of material performance testing, and discloses a testing method for evaluating the chemical solvent permeation resistance of reinforced plastics, which comprises the following steps: constructing an inverse transfer function to compensate platform lag, and predicting the starting time of microcrack opening in the next period by using historical strain data, the method comprises the following steps: calculating an instruction sending moment by combining inherent delay of a platform, adaptively adjusting an optimal disturbance frequency based on a stiffness attenuation rate calculated in real time, generating a correction disturbance instruction by using an inverse transfer function, performing superposition injection, and deducting pre-calibrated fluid viscous damping work from single-cycle data to obtain effective dissipation density. And determining a failure end point based on the second derivative change of the effective dissipation density sequence. According to the method, the time synchronization of pressure waves and crack opening is realized through a prediction feedforward strategy, the deep penetration driving force is maintained by utilizing self-adaptive disturbance, the fluid damping interference is eliminated through an energy decoupling mechanism, and the authenticity and the result accuracy of the stress-assisted solvent penetration test are improved.

The application relates to the technical field of spacecraft electronic systems, and provides a high-function-density integrated electronic system for micro-nano satellites, which comprises the following: a core heterogeneous computing unit formed by adopting system-level packaging technology; a multifunctional radio frequency and communication unit which integrates a radio frequency transceiver front end, a baseband processing circuit, a power amplifier module and a radio frequency switch by adopting heterogeneous integration technology; an intelligent power management unit which adopts a wide-band semiconductor power device to improve conversion efficiency; a three-dimensional mother board which internally integrates a signal layer, a power supply layer, a ground layer and embedded passive components; a multi-mode hybrid bus which is composed of a high-speed serial bus, a low-speed control bus and an on-chip high-speed interconnection bus; a driving unit which realizes overcurrent protection and state monitoring; and a heat management structure which comprises a heat conduction path embedded in the mother board, a heat spreading plate in contact with high-power chips and a phase change heat storage material. The problems of low function density, insufficient processing capacity, large volume and weight and high power consumption of a traditional architecture are solved.

The application discloses a kind of optical fiber gyro inertial platform angular vibration transmission characteristic test methods, including synchronous acquisition position angular vibration table excitation angle signal and the frame angle signal of optical fiber gyro inertial platform;According to the frame angle signal of optical fiber gyro inertial platform, the method for obtaining optical fiber gyro inertial platform attitude angle signal is adopted navigation solution, and it is relevantly operated, and relevant characteristic function is obtained;According to the relevant characteristic function, the amplitude-phase characteristic solution of stable loop is carried out, and the amplitude of stable loop and the phase of stable loop in optical fiber gyro inertial platform are obtained;The application also discloses a kind of optical fiber gyro inertial platform angular vibration transmission characteristic test system, including position angular vibration table, optical fiber gyro inertial platform, optical fiber platform ground test system, position angular vibration table control cabinet and electric control box.The application can be applied to the transmission characteristic evaluation of optical fiber gyro inertial platform angular vibration, with higher accuracy and flexibility.

The invention discloses an unmanned aerial vehicle remote control method, device and equipment and a medium, and relates to the technical field of communication, and the method comprises the steps that ground communication equipment obtains an original remote control frame from a control station; the original remote control frame comprises a first timestamp when the control station generates the original remote control frame; and after the original remote control frame is verified to be normal based on the to-be-verified field, triggering a preset frame sending operation so as to add a second timestamp when the operation is triggered to the original remote control frame to obtain a first remote control frame, and sending the first remote control frame to airborne communication equipment carried by the unmanned aerial vehicle, and when the second remote control frame is verified to be normal based on the to-be-verified field and the timestamp, the unmanned aerial vehicle is controlled to respond to the second remote control frame. The time synchronization of the control station, the ground communication equipment and the airborne communication equipment is kept based on the global navigation satellite system, and the transmission reliability of the remote control frame is improved in combination with remote control frame abnormity verification.

The application discloses a method and device for Ethernet time synchronization, and is applied to the technical field of communication. In the application, when a common clock node TS does not support a time synchronization message of multiple time domains in AUTOSAR, the transmission direction of the time synchronization message is determined through a gateway node TG. According to the transmission direction, the protocol format of the time synchronization message is modified. The modified time synchronization message is sent to a corresponding message transmission port. Through the modification of the protocol format in the time synchronization message, the time synchronization message meets the protocol format requirement of the time transmission message of the multiple time domains in AUTOSAR or the protocol format requirement of the time synchronization message of the TS. Even if the time domain supported by AUTOSAR does not include the time domain of the TS, the time synchronization between the TS and the TG can be realized. Therefore, the synchronization of the nodes that do not support the multiple time domains is realized under the multiple time domains.