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.

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 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.

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 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 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 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.

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.