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

The invention discloses a wireless positioning method and system. The wireless positioning system comprises at least one synchronous base station, a plurality of positioning base stations and at leastone positioning label and further comprises network communication equipment and a computing server. the synchronous base stations can also be used as positioning base stations at the same time, and the synchronous base stations and the positioning base stations further comprise high-precision clocks. The method comprises the following steps: a synchronization base station sends a synchronizationsignal at an interval of a period of time; the positioning base station receives the synchronization signal and uploads the data to the computing server; the computing server performs time synchronization on every two positioning base stations; whe positioning tag broadcasts a positioning signal once every other period of time; the positioning base station receives the positioning signal and uploads the data to the computing server; and the computing server computes the coordinates of the positioning tag.

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.

A time synchronizing method between nodes in WCDMA system includes setting up time synchronization parameters, starting SNTP service on time server, actively transmitting request information from wireless network controller or wireless network access node to the time server, choosing and judging the SNTP service mode, regularly broadcasting time information by time server for broadcast mode or regularly requesting time information from client to time server for point-to-point mode to obtain time information, and removing transmission delay to complete time synchronization.

The invention belongs to the field of ultra-wideband communication, and in particular relates to a multi-user ultra-wideband (UWB) indoor positioning system, which can be used for indoor positioning, security rescue and assistant GPS navigation. The multi-user UWB indoor positioning system comprises four reference base stations and a mobile label; clocks of the base stations and the label are completely unified into a reference time axis; the base station 1 is the main station, and used for coordinating a signal communication time sequence of the system, and simultaneously, providing time information thereof for all other base stations and the label; the base stations 2-4 are auxiliary stations, and used for respectively providing time information for the label under the control of the base station 1; and the label is a user needing to be positioned in practice, and is positioned by receiving the time information of the base stations 1-4. By means of the multi-user UWB indoor positioning system disclosed by the invention, the time synchronization problem in the UWB positioning system can be solved by establishing a unified correction model for a system clock, establishing the linear corresponding relationship between the clock and the real distance and resolving related parameters in a clock correction 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 wireless data transmission device based on a WSN (wireless sensor network), a GPRS (general packet radio service) and a GPS (global position system). The wireless data transmission device mainly comprises a GPRS RF (radio frequency) module, a ZigBee RF module, a GPS module, a 32-bit ARM (automatic route management) processor and a power management module, wherein the ARM processor is a connecting link among the modules; and the ARM processor is connected with the GPRS RF module by a UART1 (universal asynchronous receiver / transmitter), connected with the ZigBee RF module by an SPI (serial peripheral interface), and connected with the GPS module by a UART0. In addition, for improving the reliability of the device and ensuring the reliable forwarding of massive data, the device also can comprise an NAND FLASH memory which is directly connected with the ARM processor by parallel I / O interfaces. By using the device disclosed by the invention, the transmission of remote WSN monitoring data is facilitated, the reliability of WSN data transmission is improved, the design cost is saved, the anti-interference performance of the system is improved, and the time synchronization of data information is guaranteed by using the GPS module.

The invention relates to a 5G communication technology, in particular to a method and a system for processing forward data of a BBU. According to the processing method, a wireless high-level protocolstack function and a physical layer function are realized through the multi-core CPU unit; the CPRI protocol is processed through the FPGA unit; the multi-core CPU unit and the FPGA unit are connectedthrough a high-speed PCIE interface. During downlink transmission, the multi-core CPU unit sends a wireless high-level protocol stack message, physical layer IQ data and PRACH data to the FPGA for processing; during uplink transmission, the FPGA unit analyzes the CPRI protocol data and forwards the data to the multi-core CPU unit for processing. According to the invention, the processing capability of 5G forward data is improved, and the bandwidth of a 5G system is further improved.

The present invention discloses a time synchronization method of various kinds of measuring instruments in a dam-break experiment. According to the method of the invention, a high-speed camera, a wave-height meter and a flow meter are connected onto the same computer, so that the three instruments can be simultaneously started; when the dam-break experiment is implemented in a water tank, the high-speed camera records flow conformation, and the wave-height meter and the flow meter record the change of the water level of a downstream measuring point of a gate with the time and the change of the flow rate of the downstream measuring point of the gate with the time respectively. Time when dam-break water flow arrives at the measuring point is determined through a high-speed video, and a moment when corresponding water level and flow rate begin to rise is found out, and therefore, the time difference of the different instruments can be obtained; and the synchronization of the time is realized in follow-up data processing, and therefore, the time accuracy of the dam-break experiment can be improved. The time synchronization method of the invention has a wide application range and can be used in a dam-break physical model experiment and can be also used to realize time synchronization between devices in water engineering or coastal engineering physical model experiments. The time synchronization method of the invention has the advantages of simple operation, high repeatability and high transferability; and time synchronization error between the measuring instruments is smaller than 0.05 seconds.

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.

A method for detecting time fault of communication system includes generating synchronous time calibration information separately by master / standby clock processing single boards, utilizing consistence-detecting module to compare said calibration information outputted by said single boards and reporting alarm if deviation is existed on said calibration information outputted by said single boards, analyzing out which single board occurred with abnormal in combining on current service situation and deciding whether master / standby clock processing single boards should be rotated or not.

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 method and a system for obtaining high-precision time from a 5G base station through an air interface. The method comprises the following steps that: 1) basic information isacquired from an air interface of a 5G base station, and the basic information comprises SIB16 time service signaling which is issued by the 5G base station and contains time information and uplink time advance TimeAdvance of communication with the current 5G base station; 2) an air interface delay parameter is calculated through a plurality of groups of uplink time advances TimeAdvance obtained by continuous measurement; 3) time information contained in the SIB16 time service signaling is corrected according to the air interface delay parameter to obtain corrected high-precision time information; and 4) the corrected high-precision time information is sent to terminal equipment in the form of a customized frame, the terminal equipment acquires high-precision time through the customized frame. The method and the system can provide high-precision time service for the terminal equipment based on the 5G technology.

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.

The invention provides a method and a system for realizing time synchronization of a vehicle-mounted system based on an IPC mechanism, and a vehicle-mounted central processing unit runs an Ethernet time synchronization protocol gPTP and serves as a master clock to realize high-precision time synchronization of an edge gateway; the edge gateway receives an Ethernet time synchronization message, and operates an Ethernet time synchronization protocol gPTP on an MPU unit to serve as a slave clock to complete time synchronization with the central processing unit; and the MPU unit sends a local synchronized clock to the MCU unit through the IPC mechanism, generates an edge gateway global time reference through a clock synchronization management module of the MCU unit, and performs time synchronization with other ECUs or sensor nodes in a vehicle-mounted network through a CAN bus, thereby realizing global time synchronization of the vehicle-mounted system. According to the invention, elastic and flexible vehicle-mounted system time synchronization 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 discloses a software adjusting method and device for radar induction, and belongs to the field of radars, and the method comprises the steps: setting three radar measurement devices as nodes, achieving the time synchronization of the radar measurement devices through central timing and local timing, building a spatial stereoscopic model through the coordinates of the radar measurement devices and a distance measurement result, and carrying out the calculation of the spatial stereoscopic model. The technical problems of time synchronization during microwave radar positioning and automatic adjustment of the frequency of the microwave radar signal at the radar transmitting terminal are solved, the radar transmitting terminal is subjected to time correction through a central time correction method and a local time correction method, synchronization can be well achieved, and the time correction accuracy is improved. In addition, due to the fact that a local timing method exists, even if the time of the center is inconsistent with the local time, the position of the object can be accurately measured, limitation of the center is avoided, the radar frequency can be automatically adjusted, and the measurement accuracy is improved.

The invention relates to a method for holding time synchronization of digit version management, and a relative system, wherein a terminal device is arranged with a safe time unit for recording a device standard time or / and time slippage, the terminal device with the safe time unit processes time synchronization with a time synchronous reference device at start, based on the time synchronized result, correcting the safe time information in the safe time unit. The invention can effectively resolve the time synchronization problem of OMA DRM2. 0 and the accumulated error problem of maintenance safe time slippage when the device avoids initializing ROAP protocol, and the hard construction of safe time reference when the terminal safe time is destroyed (as power off, and data loss). The invention can realize safe clock via software without additional hardware on terminal device, with low cost.

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.