62results about How to "Achieve precise synchronization" patented technology

The invention discloses a high-accuracy clock synchronization method of a wireless sensor network. An upper computer and a gateway in the wireless sensor network are connected through the Ethernet; the gateway is connected with each cluster head node in the wireless sensor network through a wireless fidelity (Wi-Fi) wireless network; the cluster head nodes are connected with sensor nodes through a Zigbee wireless network; during data sending and receiving of the cluster head nodes and the sensor nodes, the transmission time of data on a media access control (MAC) layer and a physical layer serves as accurate sending / receiving time; during synchronization, all cluster head nodes are synchronized by using a global positioning system (GPS) module, and then all sensor nodes in clusters are subjected to clock synchronization through the Zigbee wireless network by using the cluster head nodes; and the synchronization of the sensor nodes comprises clock offset synchronization and transmission delay synchronization between the cluster head nodes and the sensor nodes. By adoption of the method, cost and energy consumption can be reduced, and a synchronization process is simple to calculate.

The invention discloses an EtherCAT motor driver and master station clock synchronization method. An EtherCAT motor driver comprises a slave station controller and a master control MCU, the master control MCU comprises a parallel port module, a synchronization module and a PWM module, and a motor is connected with the EtherCAT motor driver. The synchronization method comprises the steps that S1, after the EtherCAT motor driver receives a request enabling instruction of a master station, a counter of the PWM module is reset during interrupt triggering of an SYNC synchronizing signal; S2, the motor is enabled; S3, the master station sends the clock of the slave station controller and the drift value of the reference clock of the master station to the slave station controller, and the slave station controller adjusts the period number of the PWM module according to the drift value. According to the synchronization method, the load of the master control MCU is greatly reduced, and the method can be suitable for low-performance master control MCUs.

The embodiment of the invention discloses an IEEE1588 based clock synchronization method and device thereof as well as a base station clock device. The method comprises: data messages are exchanged between a secondary clock at a base station side and a system main clock by virtue of Ethernet, thus realizing clock synchronization; after synchronization, the crystal oscillator count value of the secondary clock and the crystal oscillator count value of a local clock at the base station are acquired; the crystal oscillator count value of the secondary clock and the crystal oscillator count valueof the local clock are taken as a reference source, and the adjusted value of the local clock is calculated; and the adjusted value is utilized to adjust the local clock, so that the local clock outputs a clock signal synchronous with the main clock. In the embodiment of the invention, a 1588 message protocol is utilized, and the crystal oscillator count value is adopted to substitute the count value of an external clock signal under the condition that the local clock has no reliable external clock signal input, thus realizing accurate synchronization between the local clock at the base station side and the main clock.

The invention discloses a real-time bridge state parameter monitoring and alarm system. The real-time bridge state parameter monitoring and alarm system comprises a bridge detection sensor group, a snapshot camera, a field main controller, a far-end service processor and a client, wherein the bridge detection sensor group comprises an environment detection sensor unit, a flow detection sensor unit and a structure detection sensor unit, and the field main controller comprises a central control unit, and a data acquisition unit, a synchronization triggering control unit, a field wireless data transmission unit and a GPS time service unit which are connected with the central control unit. According to the real-time bridge state parameter monitoring and alarm system, time signals of a GPS are added to measurement results, time indication codes are added to output data of the sensor and the camera, and precise data synchronization is realized; analysis and determination on data of structure detection sensors are carried out to realize complete monitoring on dynamic deformation, data resources are saved, and wireless data transmission and data storage and copy pressure is reduced.

The invention relates to the technical field of three-dimensional scanning, and provides a structured light three-dimensional method and system. The method includes the steps that an FPGA outputs a structured light image to a projector, and sends a trigger signal to a camera every time the FPGA outputs one frame of the structured light image to the projector; after the camera receives the trigger signal, a photograph is taken in real time for projections generated by the projector; the camera transmits the taken photograph to a computer; the computer conducts three-dimensional reconstruction according to the photograph transmitted by the camera. According to the method and system, synchronization of the projector and the camera in the structured light three-dimensional scanning process is achieved based on the FPGA, the structured light image is generated in real time through the FPGA, and the image is directly output to the projector through a video interface for projection; meanwhile, synchronizing signals are sent to the camera, the camera is triggered to take the photograph for the projected structured light image, so that accurate synchronization of the projector and the camera is achieved, and then high-speed structured light three-dimensional scanning is finished.

The invention relates to a controller of a converter of a dual-fed wind power generator, which is formed by connecting a touch display screen, a PLC module, a data acquisition and control module and a network interface module, wherein the touch display screen is connected with the PLC module, the PLC module is connected with one end of the network interface module, the other end of the network interface module is connected with a control and pitch control system of a wind turbine, the PLC module is further connected with the data acquisition and control module, and the data acquisition and control module is simultaneously connected with a rotor side power module and a network side power module. The controller adopts the modular design and can realize the double closed-loop control of a power outer loop and a current inner loop through acquisition, analysis and treatment of various analog signals, digital quantity signals and rotation speed signals, and simultaneously realize the functions of centralized acquisition of data, fault prediction, diagnosis and the like, and has the characteristics of strong anti-interference ability, abundant network interfaces, fast measurement speed, high control precision, friendly man-machine interface and the like.

The invention discloses a multichannel logic analyzer with a synchronous signal self-calibration function. A calibration signal generation module, a channel selection module, an edge detection module and a deviation calculation module are added to the multichannel logic analyzer, wherein the calibration signal generation module is used for generating calibration signals, wherein one-time signal edge jump happens to the calibration signals during a process of storing calibration data acquired at one time; the channel selection module is used for carrying out switching between a standard mode and a normal acquisition mode; the edge detection module carries out edge detection on acquisition data for calibration signals in each channel to detect and obtain the serial number of a sampling point of the jump edge in the channel storage data in the storage data; and the deviation calculation module is used for calculating the synchronous deviation value of each channel relative to a reference channel according to the serial number of the sampling point of the jump edge and sending the synchronous deviation value to an upper computer to synchronize the actually-acquired data. Thus, the relative synchronous deviation between channels can be accurately detected, and precise synchronization between the multiple channels is realized.

The invention relates to a network synchronous control method of robot cluster cooperation tasks. According to the network synchronous control method of robot cluster cooperation tasks, action instructions transmitted from a computer side are received through a host robot; the action instructions are processed and then are transmitted to multiple slave robots; the closed-loop control of the synchronous working of multiple robots is realized; the time differences of receiving task instructions by different robots are reduced; before the multiple robots execute the instructions, a delay control method and an absolution time method are added; the precise behavior synchronization of the multiple robots is realized; compared with the existing control method, in adoption of the method provided by the invention, the action execution accuracy and success rate are higher; and the time delay is less.

The invention discloses a relay protection action delay time grading test system and method on the basis of Rogowski coil transient simulation. The system comprises an upper computer and a test host computer; the upper computer is provided with a data source generating module and a delay time test module; the test host computer comprises a master controller, a data generating module, a data acquisition module, a D / A module, an A / D module and an acquisition interface module. According to the system and method, firstly, a transient simulation model of the Rogowski coil under electrical power system failure conditions is established by the data source generating module, and then transient simulation data is sent to the test host computer in real time; differential small analog quantity signals are sent to a collector through the data generating module and the D / A module to establish whole interval dynamic analog data; at the same time, the small analog quantity signals are used as a standard source, and then serial data signals, merged unit 9-2 data, digital relay protected GOOSE data and intelligent terminal switching values are collected, and therefore, a whole set of test system is established; a delay time of those signals relative to the transient standard source and an overall action delay time can be tested.

The invention discloses a multi-shaft motor synchronization control method and a multi-shaft motor synchronization control system; an industrial control computer converts motion trails of a robot into motion target trails of corresponding a plurality of motors, and the industrial control computer transmits the motion target trails of each motor to a corresponding motion controller through a CAN bus; the corresponding motion controller controls the corresponding motor to move, so the plurality of motors can simultaneously move according to self motion target trails. A target point and a corresponding time point commonly output mode can be used to drive an industrial robot to reach the target point in the same time point even if target trail time received by the motion controller is not consistent, so the multi-shaft motor in the industrial robot can singly operate and keep synchronization, thus realizing precision synchronization of the multi-shaft motor; the software time synchronization mode is used, so no hardware cost is not needed so as to reach motor precision synchronization purpose, thus greatly reducing upgrading and rebuilding cost of the industrial robot.

The invention discloses a synchronization method for a household base station, and a household base station. The method comprises the steps: starting a WiFi module through the household base station after the household base station is electrically connected, and scanning other household base stations which are located in the same region as the household base stations and used for transmitting WiFi signals; obtaining a main household base station from the scanned other household base station, and measuring the time deviation between the household base station and the main household base station according to synchronization information acquired from the WiFi signal transmitted by the main household base station, wherein the main household base station can provide the synchronization information to the base station; and adjusting the local clock of the household base station according to the time deviation, so as to complete the clock synchronization with the main household base station. In the scheme, because the synchronization information can be scanned through the WiFi module disposed in the household base station to achieve the clock synchronization between household base stations, the method can achieve the accurate synchronization between the household base stations more simply and quickly on the basis of not modifying hardware and not occupying high-frequency resources.

A remote sensing satellite GPS time system testing method, which makes the time of the attitude orbit control subsystem consistent with the time reference of the ground time system equipment, and the ground test equipment of the attitude orbit control subsystem is consistent with the time reference of the ground time system equipment, and finally realizes the attitude orbit The timing of the control subsystem is consistent with that of the ground test equipment for the attitude-orbit control subsystem. The present invention can reduce the start-up delay error of the attitude orbit control ground equipment and the GPS signal emulator by processing the time statistics of the attitude orbit control ground testing equipment, and eliminate the cumulative error between the satellite and the ground produced by the attitude orbit control ground equipment, Accurate synchronization between the satellite and the ground is achieved, thereby improving the time and orbit determination accuracy of the satellite attitude and orbit control subsystem.

The embodiment of the invention discloses a laser radar and camera synchronization method and device, equipment and a storage medium. The laser radar and camera synchronization method comprises the steps of obtaining a scanning angle and a timestamp of the scanning angle in a real-time scanning process of a laser radar; determining triggering angles of at least two cameras according to the timestamp, the attribute information of the laser radar, the attribute information of the at least two cameras and the joint calibration information of the laser radar and the at least two cameras; and determining a target camera to be synchronized with the laser radar from the at least two cameras according to the scanning angle and the triggering angle, so as to trigger the target camera at the triggering angle to start to execute the operation of acquiring image data, thereby enabling the target camera to synchronously acquire the image data when the laser radar scans to the installation angle ofthe target camera. The synchronization accuracy of the laser radar and the cameras is improved, and the fusion visual field of the laser radar and the multiple cameras is maximized.

The invention discloses a method of time synchronism between single plates. The system clock plate distributes a first impulse signal to the respective single plate and the respective single plate time counter receives a second impulse signal and counts. The first impulse signal is a preset reference delay. Respective single plate updates the high position portion of the time counter based on the time message in the time counter buffer and resets the lower position portion in the time counter. Respective single plate realizes the time synchronism recorded by the high position portion and lower position portion of the time counter. The technology scheme realizes the accurate synchronism of the time information among the single plates inside the hardware platform system.

The invention relates to a mobile CT synchronous scanning control system, wherein a master controller is used for sending run command information to a synchronous control module; the synchronous control module is used for converting the command information to controlled quantity of each driver and respectively sending the controlled quantity to a driver of a rotating frame rotary motor control module and a driver of a rotating frame horizontal motor control module; the drivers of the rotating frame rotary motor control module and the rotating frame horizontal motor control module are used for respectively driving respective motors according to the controlled quantity; encoders of the rotating frame rotary motor control module and the rotating frame horizontal motor control module are used for feeding back actual locations and speed information to the synchronous control module; and the synchronous control module is also used for calculating synchronized error and compensation of the above dual motors according to the actual locations and speed information of the motors. The invention also relates to a mobile CT synchronous scanning control method.

The invention relates to a collecting and transmission method for real-time hierarchical nested data of wireless optical fiber sensor networks. The method includes: using central control nodes, routing nodes, control nodes to form a top network in the wireless optical fiber sensor networks, adopting a multi-hop poll mechanism during a top poll period, using the routing nodes and part of the control nodes to implement routing function so as to realize remote multi-hop transmission of control information and sensor data; using the control nodes and wireless optical fiber sensor nodes to form a bottom network, adopting a bisynchronous dynamic time-division multiplexing mechanism during a bottom data collecting and transmission period so as to realize distributed synchronous collecting and transmission of the same hot spots monitoring quantity; and nesting the bottom data collecting and transmission period in the top poll period. The wireless optical fiber sensor networks is low in power consumption, widespread, real-time and the like, and is applicable to known monitoring fields of multiple application environments such as oil depot tank groups, power systems, mine tunnels, greenhouse granaries and the like.

The invention discloses a new node network accessing synchronizing method of a wireless multi-hop collaboration network. The new node network accessing synchronizing method comprises the following steps of S1, periodically broadcasting MSH-NCFG information in a network node; S2, performing network accessing scanning on the new node, establishing a physical neighbor list, and selecting a plurality of pre-selected sponsor nodes; S3, enabling the new node to select one of pre-selected sponsor nodes to perform coarse synchronizing; S4, enabling the new node to start a timer, and carrying the MSH-NENT information of each pre-selected sponsor node information to the broadcast of each neighbor node; S5, enabling the pre-selected sponsor node receiving the MSH-NENT information to calculate the transmission delay between the pre-selected sponsor node and the new node, and reply NCFG-NEO information to the new node; S6, after the timing of the timer is reached, enabling the new node to select one sponsor node from the pre-selected sponsor node corresponding to the received NCFG-NEO information, and performing fine synchronizing; S7, enabling the new node to judge whether the reference node of the coarse synchronizing and the reference node of the fine synchronizing are the same node or not; when the reference node of the coarse synchronizing and the reference node of the fine synchronizing are not the same node, compensating the error of coarse synchronizing. The new node network accessing synchronizing method has the advantage that the accurate synchronizing of new node and network is realized.

The invention discloses a snapshot device for load case of a bridge. The snapshot device comprises a GPS (Global Position System), a wireless transmission terminal, an image recording system, a load parameter sensor and a data processing and controlling system, wherein the data processing and controlling system comprises a time base unit, a time source data fusion unit, a data processing unit and a trigger pulse output unit. The snapshot device is capable of collecting and analyzing signals of an outside deflection sensor, a strain sensor and a vibrating sensor, judging thresholds of the signals, determining whether the bridge dynamically deforms, outputting trigger signals according to results, driving the image recording system to work and guaranteeing reasonable monitoring of the dynamic deformation of the bridge. The snapshot device has the effects of saving data resource and reducing the wireless data transmission and the pressure of data storage and backup.

The invention discloses a stage multidimensional synchronous control system. Use cost and energy consumption are greatly reduced by arranging a Beidou positioning unit in each stage subsystem; a relay transmitting unit adopts two types of network connection, and can give consideration to data transmission amount and power consumption; accurate synchronization of the stage subunits can be realized by calculating a synchronous scheme of timer deviation and transmission time delay.

The invention discloses a linear glue spreading machine and a linear composite glue flake spreading machine. The linear glue spreading machine is characterized in that a motor in a rack drives a spindle winding round a first polyester film to rotate via two transmission gears and drives a spindle winding round a second polyester film to rotate via another two transmission gears; the first polyester film passes above a glue box; a spindle is arranged above the glue box and drives a glue spreading wheel on the spindle to rotate by rotating; the glue water in the glue box is spread on the first polyester film contacted with the glue spreading wheel; the first polyester film on which the glue water is spread is stuck to the second polyester film, and the two films pass between a roller and a compression roller and are firmly stuck after being compacted; and the rotating speeds of each transmission gear, the spindle with the glue spreading wheel, the roller and the compression roller are accurately and synchronously controlled by a PLC control servo motor. The linear glue spreading machine is used for sticking the polyester films efficiently to prepare composite flakes. The linear composite glue flake spreading machine is used for cutting the stuck composite flakes into individual composite flake in a size required by the users.

The invention discloses a multiprocessor PWM carrier synchronization method, and belongs to the field of power electronic converter control. According to the synchronization method, a master processorand a plurality of slave processors are adopted, wherein the master processor is provided with a PWM unit and a carrier synchronization signal generation unit, and the carrier synchronization signalgeneration unit generates a synchronization signal with the same phase as the PWM unit; the plurality of slave processors have the same structure and are provided with carrier synchronization signal phase-locked loop units and PWM units, and the carrier synchronization signal phase-locked loop units track synchronization signals of PWM carriers of the master processor in real time through the PWMunits so as to achieve accurate synchronization of the PWM carriers of the master processor and the PWM carriers of the slave processors. The PWM quasi-synchronization method has the advantages that the PWM quasi-synchronization method is suitable for a PWM carrier synchronization method of multiple processors, does not depend on a hardware synchronization unit, and can achieve PWM wave precise synchronization of the multiple processors without the hardware synchronization unit; the method is not influenced by interrupt response time of various processors, accurate synchronization of PWM wavesof the main processor is achieved, and the performance and stability of parallel operation control of the multi-grid-connected converter are improved.

The invention relates to the technical field of aerospace engineering ground test equipment, in particular to a three-dimensional motion gravity compensation system for a space manipulator. The system comprises a compensated mechanical arm, a follow-up mechanism, a support and a hanging spring suspension system, the compensated mechanical arm is arranged at the bottom of the support, and the follow-up mechanism is arranged at the top of the support and connected with the compensated mechanical arm through the hanging spring suspension system; the compensated mechanical arm and the follow-up mechanism are the same in structure, and three-dimensional motion gravity compensation of the compensated mechanical arm is achieved by synchronously controlling motion of the compensated mechanical arm and the follow-up mechanism. Multi-axis and three-dimensional motion gravity compensation is carried out on the compensated mechanical arm, and the purpose of simulating the space microgravity working state on the ground is achieved.

The invention is applied in the technical field of radio electronics and telecommunication, and particularly discloses an all-digital single-channel broadband signal generation method and an all-digital single-channel broadband signal generation device. The all-digital single-channel broadband signal generation method comprises the following steps of: a, generating broadband waveforms; b, performing deserialization processing on the broadband waveforms; c, performing first-level multiplexing on deserialized parallel data by using a multiplexer; d, performing high speed second-level multiplexing on a relatively higher speed digital signal obtained by the first-level multiplexing; e, performing third-level ultra high speed digital signal multiplexing on the second-level-multiplexed high speed digital signal; and f, performing digital-to-analogue conversion on an ultra high speed digital signal to obtain a broadband signal, wherein each multiplexing step is controlled synchronously. By the method and the device, the signal generation and digital-to-analogue conversion of a high speed digital-to-analogue converter (DAC) are realized, a high sampling rate is realized by multi-level multiplexing, accurate multi-channel multi-level synchronization is realized by accurate synchronous control, an actual circuit is developed, and a single-channel broadband signal source can be generated.

The invention pertaining to the field of wireless data transmission technology discloses an orthogonal frequency division multiplexing (OFDM) synchronization method. The method comprises steps of estimating data connection between a PC (personal computer) and an FPGA (field-programmable gate array), an FPGA synchronization adjusting module receiving un-synchronized baseband OFDM flow of symbols, and counting sampling points of data; the PC sending interception sampling control signals to the FPGA for controlling the FPGA to intercept sampling data within an appointed range and counting value of sampling points at the interception moment from the OFDM flow of symbols after the synchronization adjusting, and then sending back the sampling data and counting value to the PC, the PC performing synchronization detection to the data sent back according to the current synchronization state and sending a synchronization adjustment control signal to the FPGA to perform synchronization adjustment, at the same time, upgrading the synchronization state and interception range in the interception sampling control signal to complete one synchronized cycle, performing synchronized cycles continuously, and finally outputting a synchronized pilot frequency and data separated OFDM flow of symbols. By adopting the method, complex calculation part in an OFDM synchronization method is transferred from FPGA to PC, the implement of OFDM synchronization method becomes easier relatively.

The invention provides a wireless clock synchronization method without a central base station, a system and a medium, comprising the following steps: a base station domain dividing step: dividing eachbase station to obtain a divided base station domain; base station domain clock synchronization step: according to the divided base station domain, clock synchronization parameters corresponding to each base station in the base station domain are allocated to synchronize clock information of each base station in the base station domain. The invention can realize precise synchronization of clocksbetween base stations in a Tsync time period. The invention can solve the problems of low synchronization precision and clock out-of-step after synchronization and the like existing in the prior art.The invention can realize the dynamic division of the base station domain, and solve the problems of dynamic discrimination, decomposition and combination of the smallest base station domain when thebase station is dynamically increased, decreased or moved.

The invention relates to a stage multi-dimensional system synchronous control method. By setting Beidou positioning units on every stage subsystem, the use cost and energy consumption can be greatly reduced; relay transfer units are connected through two types of networks and take both data transmission and power consumption into consideration; by means of a synchronization scheme of computing deviation and transmission delay of a timer, precise synchronization of all the stage subunits can be achieved.

The invention discloses an adaptive precise time establishing method for navigation satellite inter-satellite link equipment. The method comprises the steps of (S1) carrying out whole second detection on the 1PPS from a spaceborne time frequency unit, (S2) providing a path of analog reference clock signal by the spaceborne time frequency unit, maintaining strict phase consistence with 1PPS, wherein the inter-satellite link equipment obtains the fine scale of a local clock through the tracking measurement of a reference clock signal phase, (S3) carrying out ambiguity processing on the local clock, and generating a local time which is precisely synchronous with a satellite system time. The method has the advantages of a simple principle, easy realization, and the improvement of accuracy.

The present invention discloses a smart grid sensing device. The smart grid sensing device comprises a central processing unit, a global positioning system connected with the central processing unit, a large-volume data buffer, a temperature sensor, a high-precision analog-digital converter, an induction taking power circuit, a short-range wireless communication module and a long-range wireless communication module. The central processing unit is connected with a digital analog converter which is connected with a crystal oscillator, and the crystal oscillator is connected with the central processing unit. Through adoption of a mode of taking power from power induction current, the smart grid sensing device supplies power to a device with no need for external power source and battery; and the smart grid sensing device is not limited by single-end power supply and is slightly influenced by the factors such as the fluctuation of load, the harmonic wave, the grounding resistance, the fault close angle and the like; and moreover, the original fault transient state information and the opposite end information are effectively utilized in the fault feature extraction, the single-phase earth fault line selection and positioning problems of a small current grounding system are effectively solved.

The invention relates to a data synchronization method and a data synchronization device of a distributed system, which are based on frame numbers and sift characteristic vectors. The method is divided into two situations according to the frame numbers: when the frame numbers are the same, searching a frame, wherein the frame number of the frame is the same as the frame number of a reference current frame, and the similarity between a characteristic vector of the frame and a characteristic vector of the reference current frame is 1; if the frame can be searched, then directly displaying the frame; and if the frame cannot be searched, then taking the buffering queue as a new reference queue, and then carrying out re-judgment; and when the frame number is not the same, searching a frame, wherein the similarity between the characteristic vector of the frame and the characteristic vector of the reference current frame is 1; if the frame can be searched, then directly displaying the frame; and if the frame cannot be searched, then taking the buffering queue as a new reference queue, wherein the buffering queue is used as a reference, and then carrying out re-judgment. According to the method and device, the queue which is displayed fastest in a plurality of queues is used as a reference, and frames displayed synchronously are searched according to the similarity of the characteristic vectors, so that precise synchronization of data can be realized; besides, the method has the advantages of being fast in processing speed, stable and reliable, etc.