61results about How to "Solve time synchronization" patented technology

The invention discloses a tunnel structure monitoring system and a tunnel structure monitoring method based on a distributed long-gauge fiber bragg grating. The system comprises distributed long-gauge fiber bragg grating sensors which are comprehensively distributed in a monitored range along the axial direction and the cross section of a tunnel; and longitudinal sedimentation of the tunnel and change conditions of various ring joints of the shield tunnel are monitored. The method comprises the following steps of arranging the distributed long-gauge fiber bragg grating sensors; and acquiring, transmitting and processing data. By the tunnel structure monitoring system and the tunnel structure monitoring method based on the distributed long-gauge fiber bragg grating, full-life monitoring on a tunnel structure in a construction period and a running period can be carried out, and longitudinal sedimentation, convergence deformation, joint deformation, duct piece internal force, strain and the like of the tunnel structure are dynamically monitored in real time.

The invention discloses a space-time synchronization system for laser radar and camera data. The space-time synchronization system comprises an FPGA local clock correction module, an FPGA, a laser radar synchronization module, an FPGA triggering camera module which sends a picture of the camera containing the internal timestamp of the camera to an industrial personal computer; a camera picture timestamp module which is used for receiving flash lamp pulses generated during camera exposure by the FPGA and marking timestamps under an FPGA clock system for exposure moments of camera pictures; a timestamp matching module which is used for triggering the camera pictures with the camera internal timestamps sent by the camera module by the FPGA and receiving the camera pictures with the timestampsunder the FPGA clock system sent by the FPGA for matching; and a point cloud data compensation and fusion module which compensates the point cloud to the position of the exposure moment of the camera; and according to the measured external parameters of the laser radar and the camera, carries out alignment fusion on the point cloud data and the camera picture. Synchronous acquisition of the camera and the laser radar is realized.

A simulation model conversion method based on a distributed interactive simulation platform, includes the steps: (1)determining the time management mechanism used in the simulation model conversion process to make the federal member of the simulation model unitedly order the insulated clock of the distributed interactive simulation platform, executing the simulation step length propulsion of the simulation model according to the simulation clock of the distributed interactive simulation platform; (2)dividing the intrinsic function of the simulation model to be converted into two parts: one part being a state transition function, the other part being an event handling function; (3) according to the state transition function and the event handling function, determining the model state parameters of the simulation model to be converted ordered and issued for the distributed interactive simulation platform and the special event ordered and issued for the distributed interactive simulation platform, forming the interface describing file; (4) according to the interface describing file, generating the object class library and the interactive class library for the conversion of the model to be converted; (5) according to the generated object class library and interactive class library, reforming the model to be converted and completing the conversion of the simulation model.

The present invention pertaining to the technical field of communication discloses a time synchronization method, a device and a system thereof. The method comprises the steps of receiving time synchronization signals which comprise data of pulses per second (1PPS) and absolute times; transmitting the time synchronization signals to a client through a wired medium for performing time synchronization. The device comprises a receiving module and a transmitting module. The system comprises a device for time synchronization and a client. Therefore, time synchronization can be realized by the connection of current wired mediums between base stations, and Mus level time synchronization between indoor base stations is solved without adding wiring.

The invention discloses a data transmission method used for multiple well logging devices and a control device, wherein the multiple well logging devices comprises a first well logging device and a second well logging device. The method comprises the following steps: the first well logging device obtains reference time; the first well logging device sends a time synchronization message; the second well logging device receives the time synchronization message; the second well logging device modifies local time; the first well logging device and the second well logging device print a timestamp for well logging data; and the first well logging device and the second well logging device convey the well logging data to the control device.

The invention provides a satellite and vision tight coupling positioning method, system and medium. The method comprises a fusion system initialization step: performing vision SLAM system initialization to acquire relative pose information of a vision map and a satellite positioning coordinate system; a fusion system asynchronous tracking step: determining quantity of state by performing motion decomposition under a corresponding coordinate system on the current carrier motion according to different sensor data and acquired relative pose information of the vision map and the satellite positioning coordinate system, and performing sensor state tracking based on the quantity of state observed by the sensor, and determining a key frame and establishing a local map; and a fusion system joint optimization step: performing joint optimization positioning resolving by combining the visual local map and satellite pseudo-range data on the basis of the quantity of state obtained after navigationcoordinate system decomposition. The navigation positioning still can be robustly and accurately performed even in the complex indoor and outdoor environment by utilizing a heterogeneous asynchronoussensor positioning data updating algorithm based on the navigation coordinate system decomposition.

The invention relates to a space manipulator teleoperation communication system based on space-based relay communication. The communication system comprises a ground teleoperation unit, a space-grounddata communication unit and an on-orbit manipulator unit, wherein the ground teleoperation unit comprises a ground teleoperation table, a prediction simulation mechanism and a task simulation verification mechanism, the space-ground data communication unit comprises a flight control center, a relay satellite center, a relay satellite ground station, a relay satellite, a relay terminal, a high-speed communication processor, a data management core processing unit and a switch, and the on-orbit mechanical arm unit comprises a mechanical arm operation table, an outboard mechanical arm and a target adapter. The space manipulator teleoperation communication system based on space-based relay communication has universality and good expandability, the system compatibility is good, and influence oftime delay jitter on control stability of the on-orbit mechanical arm can be solved by adopting a remote operation instruction sequence transceiving caching strategy.

The invention discloses a loop auxiliary underwater positioning method without time synchronization. The loop auxiliary underwater positioning method without the time synchronization includes that firstly, each node completes link symmetry detection and acquires the symmetry link length by sending hello information once and sending distance measurement information once, then a water surface anchor node sends self coordinate information once, and completes positioning of a part of nodes by using distance and coordinate information, and the nodes which are positioned also send self coordinate information once, and performs iteration positioning, and finally a loop auxiliary method is adopted for nodes which are not positioned, coordinates and distances of neighbor nodes which are connected through asymmetry links are obtained, and accordingly positioning is completed. The nodes which are positioned can send the self coordinate information once, trigger a new iterative process, and furthermore enlarge a positioning coverage range, and complete the whole positioning process. The loop auxiliary underwater positioning method without the time synchronization can meet positioning requirements high in accuracy and large in coverage range, and effectively eliminates influence of the underwater asymmetry links on the node positioning under the condition that the time synchronization does not exist.

The invention discloses an ultrasonic chromatography flow field imaging method and device. The device is mainly composed of a hardware system and a corresponding software module. The hardware system mainly comprises a ZigBee control transmission node, a ZigBee data acquisition node, a temperature and humidity sensor, a displacement precision sensor, an adaptive three-axis mounting rack, a solar panel, a matched lithium battery and an upper computer. The software module of the system is divided into two parts, one part is software corresponding to an upper computer, and the other part is a program embedded into a ZigBee node. The system can completely meet the requirement for precise monitoring of U-shaped channel deformation, is flexible and diverse in interface, is rich and standard in external expansion, can carry various types of sensors, can build a wireless network by itself, has a network fault self-repairing capability, and achieves information exchange with a remote control center and system control through the mobile internet; and meanwhile, a solar cell is carried according to the used external environment, an embedded system is developed by utilizing a single chip microcomputer to realize an energy supply management distribution strategy, and self-sufficiency of energy supply is realized.

A method of time synchronization between a timepiece-equipped electronic device and a cell phone or an IPAD, which includes the steps of: (a) utilizing the universal standard time of the cell phone or IPAD by a time synchronization APP to obtain a synchronization time information; (b) modulating an audio frequency carrier signal or time signal from the digital signal of the cell phone or IPAD based on the encoding rules of audio phase-shifting; (c) transmitting the time information in the audio frequency carrier signal to the timepiece-equipped electronic device through audio or data signal transmission channel by utilizing the Bluetooth module or WIFI of the cell phone or IPAD; and (d) receiving and pairing the audio frequency carrier signal, decoding the time information and displaying the time information, which is the synchronized time with the cell phone or IPAD, onto the display of the timepiece-equipped electronic device.

The invention discloses a system for adjusting transmission time of an inputted signal of a transmitter and a realizing method thereof. A fixed time is required for storing one bit of a digital signal, so that the storing time of the digital signal can be adjusted by adjusting the storing depth thereof, thereby efficiently solving the synchronous problem of the signal receiving of a single-frequency network. The system and the method provided by the invention are suitable for various products with different powers and are used for fully supporting a VHF (Very High Frequency)/UHF (Ultra High Frequency) frequency range and a digital television channel bandwidth in common use, thereby shortening the length of an optical fire circuit, lowering the construction cost of a network, and being beneficial to the popularization and the application of the single-frequency network.

The invention discloses an array pseudo satellite and GNSS combined positioning method and an array pseudo satellite and GNSS combined positioning system, belonging to the technical field of pseudo satellite positioning navigation. The system comprises a multi-channel signal emitter, an array antenna, a receiver, an intelligent terminal and a navigation satellite, wherein the multi-channel signalemitter is used for emitting different PRN codes, and signals of the multi-channel signal emitter are compatible to GPS and BDS signals; a commercialized GNSS receiver can receive the signals, furtherperforms combined positioning with a pseudo satellite and a GNSS, and eliminates clock offset of pseudo satellite pseudo range through using difference between array channels. According to the methodand the system provided by the invention, positioning is executed through a micro positioning system composed of one array pseudo satellite and three navigation satellites, and experiments show that,compared with a four-global navigation satellite system, the micro positioning system can realize combined positioning, and horizontal positioning precision is improved.

The embodiment of the invention relates to the technical field of sensor calibration, and discloses a multi-sensor clock synchronization method and device and computing equipment. The method comprisesthe following steps: acquiring a first angular velocity of a first sensor in a first sensor coordinate system; obtaining a second angular velocity of a second sensor in a second sensor coordinate system and a transformation relationship between the first sensor coordinate system and the second sensor coordinate system; calculating a third angular velocity of the second sensor in the first sensorcoordinate system according to the second angular velocity and the transformation relationship; calculating the angular velocity residual sum of the first sensor and the second sensor at each preset deviation time according to the first angular velocity and the third angular velocity; determining the minimum angular velocity residual error and the corresponding preset deviation time as the time deviation of the first sensor and the second sensor; and performing clock synchronization according to the time deviation. Through the above mode, the embodiment of the invention can calculate the timedeviation among a plurality of sensors, thereby improving the accuracy of a sensing result.

The invention provides a virtual analog-to-digital conversion core device which is used for acquiring data and providing the data for a primary device for control or protection. The core device comprises a virtual analog-to-digital conversion port. The core device sends target sampling data messages containing data which is sampled synchronously by the master clock of the primary device to the primary device by virtue of the virtual analog-to-digital conversion port. The virtual analog-to-digital conversion port comprises serial ports. According to the core device, the time synchronization is used for replacing straight line connection on hardware, thus reducing the cost of constructing a remote industrial control system greatly.

The invention relates to a method for acquiring internal stress and strain response data of a full-scale accelerated pavement test loop road and a system thereof, and belongs to the field of road internal mechanical state detection. The method comprises the following steps: acquiring massive sensor data through a data acquisition unit at a front end, and transmitting the acquired massive sensor data to a data aggregation server; performing a series of processes such as parsing, screening and filtering on the data through each layer of data processing server at a back end; and finally storing the obtained stress and strain response information in a data array for subsequent road relevant researches.

The invention discloses a time synchronization method and system for a medical Internet-of-things, and a medium. According to the time synchronization method for the medical Internet-of-things, a boundary server of a data sensing end waits for a synchronization command sent by a clock source of a cloud end, and if the synchronization command of the clock source of the cloud end is received, the boundary server takes the clock source of the cloud end as a reference node to execute time synchronization; and meanwhile, the boundary server detects whether the data acquisition terminal of the datasensing end needs time synchronization, and sends a synchronization command to the data acquisition terminal if the time synchronization is needed. The boundary server serves as an intermediate link,time synchronization of the whole medical Internet-of-things can be achieved, it is ensured that the data collection time of the whole medical Internet-of-things is accurate and reliable, and the synchronization mode is good in system expandability and high in synchronization convergence speed.

The invention provides a bidirectional ranging and positioning method. The method comprises the following steps: an anchor node i emits a ranging signal, and recording emitting moment of the ranging signal of the anchor node i and an ID of the anchor node, wherein i is equal to 1, 2, ..., n is greater than or equal to 3; a mobile terminal receives and demodulates the ranging signal from the anchornode i, executes information modulation again and then forwards the modulated ranging signal to the anchor node i; the anchor node i receives and identifies the modulated ranging signal of the anchornode i, records the receiving moment of the modulated ranging signal, and calculates a position coordinate of the mobile terminal according to the emitting moment, the receiving moment and the position coordinate of the anchor node i.