81results about How to "Guaranteed synchronization accuracy" patented technology

The invention discloses a method and a device for synchronizing information distribution of a clock in the Ethernet. According to the method, by means of a neighborhood management module of each network element and according to a network element identification, a neighborhood table of each network element is established, a clock source information management module sends a clock identification and clock quality information which are produced by a clock source to the neighborhood network elements in the neighborhood table, clock source information data banks of the network elements are established, and a clock source effective path calculating module calculates synchronous paths of the network elements according to information in the clock source information data banks so that the synchronous paths of the clock source to the network elements are obtained; and when the network topology changes or the clock source can not be used, a path switching module and a clock switching module perform recalculation to obtain new synchronous paths of the network elements. According to the method and the device for synchronizing information distribution of the clock in the Ethernet, clock ring formation can be effectively prevented, and synchronization accuracy of a synchronizing network is guaranteed.

The invention provides an indoor positioning method based on a bidirectional wireless optical communication. The indoor positioning method comprises the steps: a control centre provides a uniform time reference to realize time synchronization of N optical signal transceiver base stations; the control centre sends a distance measurement signal to the N optical signal transceiver base stations; after receiving the distance measurement signal, the N optical signal transceiver base stations transmit signals within the coverage scope; an optical signal transponder on a positioning terminal answers emission signals of M optical signal transceiver base stations and sends answering signals to the corresponding optical signal transceiver base stations, in which the number M is not less than 3 and not more than N; the M optical signal transceiver base stations respectively transfer the received answering signals to the control centre; and the control centre determines the position of the positioning terminal according to a transfer and distance-measurement principle, the sending time of the distance measurement signal, the position information of the M optical signal transceiver base stations and the receiving time of the corresponding M answering signals. The function of the positioning terminal is simplified and the precision of the indoor position is improved.

Disclosed in the embodiments of the present invention are a method and device for clock synchronization. The method comprises the following steps: slave clock equipment simultaneously carries out protocol message interactions with multiple clock source equipment , and respectively computes the time and frequency deviation with each clock source equipment according to the protocol message interaction with the multiple clock source equipment to lock the multiple clock source equipment; the slave clock equipment selects a primary clock source from the multiple clock source equipment, and corrects self time and frequency according to the time and frequency deviation with the primary clock source. According to the embodiments of the present invention, the clock source equipment is immediately locked as soon as being discovered rather than starts to be locked after being switched, so that the multiple clock source equipment is simultaneously locked by the slave clock equipment, and when the clock source equipment switching occurs, the clock source equipment is switched into the currently locked clock source equipment, and therefore, the synchronization accuracy of the time and frequency during switching can be ensured to the maximum extent, the switching speed of the clock source equipment is accelerated and switching performance is enhanced.

A dual output shaft motor based shear plate synchronous control hydraulic system relates to a plate shear synchronous control hydraulic system. The dual output shaft motor based shear plate synchronous control hydraulic system comprises two shear cylinders, two stock stopping cylinders, three pressing cylinders and a shear cylinder synchronous control system, wherein the shear cylinder synchronous control system comprises an oil tank, two same hydraulic pumps, a dual output shaft motor for driving the two hydraulic pumps to rotate, and two first check valves; an oil outlet of each first one-way valve is connected with a first oil way, a second oil way and a third oil way respectively, the first oil way comprises a pilot operated compound relief valve and a two-position two-way electromagnetic valve, the second oil way comprises a sequence valve and a two-position four-way electromagnetic valve, the third oil way comprises a reducing valve, a second check valve and a first energy accumulator, the dual output shaft motor drives the two same hydraulic pumps to supply oil for the two same shear cylinders, so as to better guarantee the synchronous accuracy of the two shear cylinders, and the two shear cylinders are respectively connected with the first energy accumulator to maintain the pressure.

The invention provides a Bluetooth signal frame synchronous detection method for a wireless general measuring instrument. The method comprises the following steps: step S1, inputting a signal; step S2, coarsely synchronizing frame power judgment; step S3, calculating a phase angle; step 4, differentiating; step S5, filtering; step S6, eliminating an initial frequency offset, and obtaining a sequence f (n); step S7, an initial position is n, and the length of each symbol is Ts, and performing a GFSK (Gaussian Frequency Shift Keying) demodulation judgment on every 5 GFSK symbols; step S8, if ''10101'' or ''01010'' is found, then entering the next step; and if ''10101'' or ''01010'' is not found, then n=n+1 and returning to step S7; and step S9, taking points from (n+(1 / 3) *Ts) to (n+(2 / 3) *Ts) as initial points, and orderly performing a sliding judgment on 5 symbols. The Bluetooth signal frame synchronous detection method for the wireless general measuring instrument provided by the invention has the following beneficial effects: Bluetooth signal frame synchronous detection of the wireless general measuring instrument can be realized, an MAC address is not depended, and certain synchronization accuracy can be guaranteed.

Disclosed are a method of and system for providing time synchronization among first and second computer systems, where each of the computer systems includes hardware, operating system software and a layer of microcode operating between said hardware and said software. The method comprises the steps of using the microcode of the first computer system to provide a first timestamp, using the microcode of the second computer system to provide a second timestamp and a third timestamp, and using the microcode of the first computer system to provide a fourth timestamp. The method comprises the further steps of using the first, second, third and fourth timestamps to determine a timing difference between the first and second computer systems, and adjusting the timing among said first and second computer systems on the basis of said determined timing difference. Preferably, the first and second computer systems are connected together by a point-to-point link; and the first timestamp is sent from the first computer system to the second computer system, and the second and third timestamps are sent from the second computer system to the first computer system over that point-to-point link.

The invention relates to the technical field of engineering machinery, and discloses a synchronous drive control system, which comprises a hydraulic pump, a change valve, and a first double rod cylinder and a second double rod cylinder which have the same capacity. The oil inlet of the hydraulic pump is communicated with an oil tank, while the oil outlet is communicated with the oil inlet of the change valve; the first oil outlet of the change valve is communicated with a left cavity of the first double rod cylinder; a right cavity of the first double rod cylinder is communicated with a left cavity of the second double rod cylinder; a right cavity of the second double rod cylinder is communicated with the second oil outlet of the change valve; and the return port of the change valve is communicated with the oil tank. The synchronous drive control system can realize synchronous action of two cylinders, and has the advantages of simple structure, small influence by external load and low cost. The invention also discloses engineering machinery provided with the synchronous drive control system.

The invention discloses a separate type wave surface conversion scanning device of a direct-vision synthetic aperture laser imaging radar. The separate type wave surface conversion scanning device is placed between a laser light source and a transmitting primary mirror and is composed of a cross-track direction wave surface conversion scanning structure and an along-track direction orthogonal polarization wave surface conversion structure. According to the theory, the cross-track direction wave surface conversion scanning structure converts and scans a cross-track direction wave surface generated by an incident beam wave surface by means of a movement method of single cylindrical lens translation or reflecting mirror deflection, the along-track direction orthogonal polarization wave surface conversion structure further decomposes the incident beam wave surface into two orthogonal polarized separated space channels, an along-track direction cylindrical mirror is arranged in each channel to conduct wave surface conversion and wave surface reversal, two coaxial polarized orthogonal scanning transmitting wave surfaces are synthesized, and finally the two scanning transmitting wave surfaces are directly imaged onto a target surface through a transmitting optic primary mirror. The direct-vision synthetic aperture laser imaging radar separate wave surface conversion scanning device has the advantages of being simple and reliable in structure, and capable of achieving two wave surface bidirectional scanning through one drive and conveniently changing the operating performance parameters of radar by the adoption of cylindrical mirrors with different focal lengths or different deflection ranges of a reflecting mirror.

The invention discloses a driver for synchronous control of multiple motors, which aims to provide a driver for synchronous control of the multiple motors which can effectively reduce the weight and the size of the motor driver and can simultaneously or separately control steering and speed of multiple DC motors without programming. The invention is realized by the following technical solution: aCPU circuit board provides four working mode selections of an analog input mode, an R / C input mode, a simple serial port mode and a packet serial port mode for a driving circuit board; an analog quantity acquisition module in the CPU circuit board acquires the motor position, the current and the rotation speed information of the drive circuit board through a motor control interface module. A complex programmable logic device CPLD performs logic transformation on various input / output discrete quantities. A DSP module and a CPLD interface acquire / transmit logic signals, analyze and process RS422communication module in an RS422 communication module, control the motor control circuit to operate, and output control information to the drive circuit board to control the motor to operate according to predetermined parameters.

The invention discloses a GPS synchronous IRIG-B time code generator, which comprises a GPS receiver, a singlechip, a direct current B code generating circuit and a direct current code to alternating code switching circuit. The direct current B code generating circuit generates direct current B codes and 1 kHz square wave signal P1k which is synchronous with a second pulse signal, the direct current code to alternating code switching circuit performs low-pass filtering and phase-shifting correcting treatments on the square wave signal P1K to obtain a 1 kHz sinusoidal carrier having same frequency and phase with the square wave signal P1K, and the direct current B codes are used for performing amplitude modulation on the sinusoidal carrier to obtain alternating current B codes. The GPS synchronous IRIG-B time code generator obtains high-precision direct current B codes by adopting a hardware synchronization frequency division technique and generates high-precision alternating current B codes by adopting filtering, phase correction and amplitude modulation techniques and the complete device has a simple structure and is easy for popularization and application.

The invention relates to a synchronization method and synchronization device for the data acquisition of a merge unit for an intelligent substation. The method includes the following steps that: when the ADC (analog-to-digital converter) plug-in of the merging unit receives synchronization information sent by a CPU plug-in, a local time stamp is generated through a thermostatic crystal oscillator, wherein the local time stamp is named as an ADC (analog-to-digital converter) local time stamp; and when the synchronization information received by the ADC plug-in is invalid, self-timekeeping counting is carried out according to the ADC local time stamp. The device includes a CPU plug-in and an ADC plug-in; the CPU plug-in comprises a synchronization information generation module and a synchronization information sending module; the ADC plug-in comprises a synchronization information analysis module and a synchronization timekeeping module; and the CPU plug-in is communication connection with the ADC plug-in. According to the synchronization method and synchronization device for the data acquisition of the merge unit for the intelligent substation of the invention, self-timekeeping counting can be carried out according to synchronization time under a condition that sampling pulses are burred or lost due to interference, and therefore, sampling data error or loss in a short term can be avoided, and the stability and reliability of sampling are enhanced with cost not increased.

The invention discloses an acquisition terminal of a power distribution network capable of realizing data synchronization. The terminal comprises a master control unit (MCU) and a plurality of acquisition units, wherein, the acquisition units are connected with the MCU through buses; the MCU is used for periodically sending synchronous command frames carrying the current time and synchronous serial numbers to the acquisition units, and each synchronous command frame comprises a synchronous clock command frame and a synchronous sampling command frame; and the acquisition units are used for receiving the synchronous sampling command frames, calculating a telemetering vector through recording the number of the current sampling point, and sending the telemetering vector to the MCU, and the telemetering vector comprises a real part and an imaginary part of the telemetering vector as well as the corresponding synchronous serial numbers. In the invention, the MCU and the acquisition units perform networking communication through the buses, and data synchronization among the plurality of the acquisition units is realized by means of the synchronous command frames so as to avoid repeated data acquisition. Therefore, the acquisition terminal has the characteristics of good real-time property, and is easy for implementation; and data synchronization precision is ensured.

The invention provides an astronomical integrated navigation system data communication and processing method. Sampled data of different sensors are kept in whole-second alignment, data are synchronously collected, and data communication and data processing of all unit modules of the astronomical integrated navigation system are achieved through the FPGA.It is guaranteed that data communication between the navigation processor and each sensor module is real-time and accurate, the data communication state can be monitored, and long-time synchronization and accuracy are guaranteed. According to the invention, the synchronization accuracy of long-time work of the system is ensured.The state of each sensor module and the availability of data are monitored in real time, a basis is provided for subsequent high-precision integrated navigation.Navigation processor resources are saved.The read data is ensured to be complete and effective, data verification does not need to be conducted repeatedly, and certain fault-tolerant capacity of the astronomical integrated navigation system is provided.

The invention discloses a loading experimental bench of a synchronous jacking device, which comprises a console with a pump station module (7) and a parameter display device and four twin-jack test devices which are connected with the synchronous jacking device, and the console is connected with at least four twin-jack test devices. The loading experimental bench of the synchronous jacking devicehas high detection precision and high accuracy of the detection data.

The invention relates to the field of mobile antennas, and provides a transmission device and an electrically-tunable antenna. The device comprises a transmission assembly. The transmission assembly comprises first bevel gears, second bevel gears, a transmission shaft, gears and racks. The first bevel gears are meshed with the second bevel gears, the first bevel gears are used for being connectedwith an external driving mechanism, the second bevel gears and the gears are connected to the transmission shaft in a sleeving mode, the gears and the racks are more than one and are arranged in a one-to-one correspondence mode and meshed with one another, and each rack is used for being fixedly connected with a movable medium of a phase shifter. According to the transmission device, the rotationdirection of transmission is changed through cooperation between the first bevel gears and the second bevel gears; the plurality of gears can be arranged on the transmission shaft as required, so thatthe phases of a plurality of phase shifters can be synchronously adjusted by means of one external drive, the synchronization precision of phase adjustment is ensured, a required space can be provided for arrangement of more phase shifters, miniaturization of the antenna is facilitated, materials are reduced, and the manufacturing cost is reduced.

The invention relates to the technical field of chip cutting equipment, and provides a Y-axis precision alignment assembly and alignment method of a double-axis scribing machine, and the Y-axis precision alignment assembly comprises a compensation grating tool, an image acquisition unit and a control unit; the grating supplementing tool is arranged on the first Y axis and comprises a positioning piece, and at least one positioning mark is arranged on the positioning piece. According to the invention, the second Y axis is aligned in advance, and meanwhile, the positioning sheet of the supplementary grating tool mounted on the first Y axis is used for providing a reference for linkage stepping alignment of the first Y axis and the second Y axis; the control unit compensates the first Y axis according to the position deviation of the imaging area of the positioning mark in the first image and the first calibration area along the Y axis direction after each linkage stepping of the first Y axis and the second Y axis, so that the synchronization precision of the first Y axis and the second Y axis is ensured, and the cutting quality of the two Y axes of the double-axis scribing machine on the same workpiece at the same time is improved; because only one image acquisition unit is installed, the installation is simple and the debugging cost is low.

The invention relates to demolding process equipment used in the prefabrication process of high-speed railway ballastless track plates, in particular to a screw-type synchronous jacking automatic control track plate demolding machine. By adopting the demolding machine, the technical problem that the rhythm and strength of workers are hard to synchronize in the mode that the workers conduct demolding on track plates by manually pressing four jacks during the track plate demolding process in the prior art is solved. According to the demolding machine, is adopted; electric energy is used as a power source to be converted into mechanical energy required by the equipment in a motor and speed reducer combined structural form; unique rotating force is transmitted to the four mechanical jacks simultaneously through a transmission shaft and commutator connected structural form; while screw rods rotate, the synchronous jacking process is realized. The problem that four jacking points are not synchronous in the demolding process of track plates in the prior art is solved. The quality of track plates is guaranteed. The demolding machine is flexible, safe and reliable in operation.

The invention provides a TTE network clock calibration method and system. The TTE network clock calibration system comprises a coarse synchronization subsystem and a fine synchronization subsystem, the coarse synchronization subsystem comprises a synchronization word detection module, a phase synchronization detection module and a coarse synchronization delay modulation module; the fine synchronization subsystem comprises an LMS adaptive filter training module, a coefficient storage module, a drift compensation model module and a fine synchronization delay processing module. A traditional taming crystal oscillator system adopts an analog or semi-digital system and has the defects of high cost, great influence of environmental factors, difficulty in debugging, difficulty in model establishment and the like. According to the time frequency basic principle of the taming crystal oscillator technology, the full-digital taming crystal oscillator system based on the clock model construction technology is designed aiming at the defects of the traditional taming crystal oscillator technology, the system can improve the time difference measurement precision, an advanced crystal oscillator noise model is utilized, analysis and debugging are convenient, and the time difference measurement precision is improved. The tracking capability and the holding capability are better than those of a traditional method.

The invention relates to a whole-course us-level-precision wireless ethernet synchronization apparatus of an intelligent transformer station and method thereof. The apparatus comprises a chip DP83640, an FPGA, and a constant-temperature crystal oscillator. Therefore, clock synchronization of different devices in a wireless Ethernet network without the IEEE1588 capability can be realized; and the apparatus and the method can be applied to development of various distributed electrical capacity quantity simulation and detection devices in a power system widely.

The invention discloses a robot dynamic track planning method for target synchronization, and relates to the field of robot control methods. A robot can stably start to track a moving target object from the static state and finally keep synchronous with the target object. The method comprises the following steps: 1, defining parameters and giving track parameters; 2, dividing stages; 3, performing dynamic planning of an acceleration synchronization stage; 4, performing dynamic planning of a deceleration synchronization stage; and 5, completing tracking and entering a synchronization stage. The whole planning process is small in operand, the requirement of real-time interpolation calculation can be met, the position of the target object does not need to be predicted, and certain synchronization precision can be guaranteed. Safety verification is realized in the tracking process, so that the safety of equipment in the actual operation process can be ensured. After the tail end of the robot is synchronized with the target object, complex track movement can be further executed according to process requirements in actual application.

The invention discloses a fast uplink method and device of TD-SCDMA (Time Division-Synchronous Code Division Multiple Access). The device comprises a radio frequency module for converting radio frequency signals transmitted by a tested terminal into intermediate frequency baseband sampling signals, and further comprises a DDP (Digital Data Processor) module, a DSP (Digital Signal Processor) module and a MC (Master Control) module, wherein the DDP module is used for converting the intermediate frequency baseband sampling signals output by the radio frequency module into first time speed sampling signals and sending to the DSP module, and the DSP module is used for carrying out signal synchronization of the received first time speed sampling signals according to measurement instructions of the MC module and determining a first synchronous position, converting the first time speed sampling signals into second time speed sampling signals, and determining a second synchronous position in the second time speed sampling signals according to the first synchronous position. In the method and the device, the uplink synchronization accuracy of the TD-SCDMA is ensured, and simultaneously the uplink synchronization efficiency of the TD-SCDMA is improved.

The invention relates to a segment crane and a shield tunneling machine. The segment crane comprises two hydraulic oil cylinders and a hydraulic control system, wherein the hydraulic control system comprises two hydraulic loops; each hydraulic loop is provided with a rodless cavity oil way, a rod cavity oil way and a reversing valve; each reversing valve communicates the rodless cavity oil way and the rod cavity oil way of the corresponding hydraulic loop with an oil supply oil way and an oil return oil way so as to control the hydraulic oil cylinder to stretch and retract through the reversing valve; the reversing valve is provided with a locking middle position and used for controlling and locking the rod cavity oil way and the rodless cavity oil way of the corresponding hydraulic loop so as to lock the hydraulic oil cylinder; and a synchronous speed control valve is arranged on the rodless cavity oil way and / or the rod cavity oil way on the two hydraulic loops so as to realize synchronous action of the two hydraulic oil cylinders. Different control modes are selected according to actual working requirements, the two hydraulic oil cylinders can be controlled to act synchronously, the single hydraulic oil cylinder can also be controlled to act, and the actual working requirements are met.

This invention relates to the field of synchronizing overlay video signals with a television video signal feed, in order to allow the overlay video signals to be mixed with the television video signal feed at the proper time intervals. The synchronization is performed by using a synchronization signal which is encoded into the closed caption line of the television video signal feed.

The invention discloses a programmable anti-interference synchronizer trigger, which provides a reliable triggering signal for an analogue to digital converter (ADC) sampling system, thereby ensuring the synchronization accuracy of the sampling system. The programmable anti-interference synchronizer trigger comprises a reference point detection comparator, a positive hysteresis comparator and a negative hysteresis comparator, wherein the positive input ends of the reference point detection comparator, the positive hysteresis comparator and the negative hysteresis comparator are connected withone another, and the negative input ends of the reference point detection comparator, the positive hysteresis comparator and the negative hysteresis comparator are connected with one another; nodes of which the positive input ends are connected with one another are connected with an input signal; the output end of the reference point detection comparator is connected with a working power supply by a resistor, and is connected with a control logic circuit by a counter respectively; the output end of the positive hysteresis comparator is connected with one end of a first resistive network and the control logic circuit; the other end of the first resistive network is connected with the positive input end of the positive hysteresis comparator; the first resistive network is grounded by a grounding end, and is connected with the control logic circuit by a port; and the output end of the negative hysteresis comparator is connected with one end of a second resistive network and the control logic circuit.