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 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 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 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 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 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 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 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 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.