90results about How to "Guaranteed time accuracy" patented technology

The present invention reveals one kind of safety chip with built-in real-time clock. The safety chip includes: a real-time clock unit to provide data file with current time of the safety chip as the timestamp mark; an outer frequency generator to provide the clock unit with reference clock frequency; a clock calibrator to correct the error of the real-time clock unit for clock sync; an enciphering unit to generate cipher key based on enciphering algorithm for the safety protection and confirmation of the safety chip read / write; and an MCU to provide the chip operation system with operation back-up and management. In addition, the present invention reveals also method of correcting the real-time clock of the safety chip. The safety chip provides data signature with non-repudiation timestamp, and can use time information in various kinds of safety service and perfect the function of safety chip.

The invention discloses an acceleration and deceleration planning method and device for a numerical control system and a numerical control machine tool. The acceleration and deceleration planning method includes the steps of carrying out T-type curve velocity planning on a machining path of an operating device of the numerical control machine tool to obtain time of the constant acceleration, time of the constant velocity and time of the constant deceleration in a T-type curve; independently adjusting the three time periods of the constant acceleration, the constant velocity and the constant deceleration in the T-type curve, and complementing the step length shorter than an interpolation period to form a whole interpolation period; obtaining the target velocity of the T-type curve velocity planning again according to the adjusted time periods; adjusting the acceleration, the deceleration and the path lengths of the time periods of the T-type curve according to the target velocity. According to the acceleration and deceleration planning method and device for the numerical control system and the numerical control machine tool, the problems of rounding errors and machine tool shaking can be accurately solved; meanwhile, complex steps for solving a high-degree equation when velocity planning is carried out on the operation device are omitted, the velocity planning efficiency of the whole numerical control system is greatly improved, and the method is relatively easy and convenient to use and easy to achieve.

The invention discloses a timing method of a terminal for transmitting upstream information, which comprises the following steps: relay equipment aligns an upstream subframe edge which is accessed to a link at an upstream subframe edge of a return link, and obtains the upstream frame timing of the relay equipment according to any one of the aligned link upstream frame timing; the relay equipment confirms the timing lead between the upper frame timing and the down frame timing according to the upper frame timing and the down frame timing of the relay equipment, and confirms an upstream information transmitting timing lead which corresponds to a terminal serviced by the relay equipment according to the timing lead; and the relay equipment informs the upstream information transmitting timing lead to the corresponding terminal for indicating that the terminal can transmit the upstream information in advance according to the upstream information transmitting timing lead. In the invention, the timing accuracy of the relay equipment and the terminal is guaranteed, thereby guaranteeing the transmission quality, and saving the resources.

The invention belongs to the field of data acquisition and provides a serial data real-time acquisition and time calibration method. An acquisition device comprises a base plate composed of serial data acquisition circuits and a core plate composed of digital signal processing (DSP) chips, wherein a global position system (GPS) module is added in the circuits of the base plate. The system base plate finishes a serial signal acquisition task and transmits acquired signal to the core plate. The core plate finishes data acquisition, data storage and time calibration processing tasks and adopts an dominant type software design concept and sets the priority level of universal asynchronous receiver and transmitter (UART) data acquisition to be highest, and other tasks are interrupted and an UART data acquisition task is carried out when data arrives. An internal real-time clock adopted by the method provides accurate time for a system and is composed of universal time coordinated (UTC) time and a timer. Acquired data and data acquisition time information are packed together, are temporarily stored in a device cache and can be uploaded to a personal computer (PC) to be stored in real time, and the time calibration accuracy can reach to + / -0.2ms.

The invention provides a personalized tour route recommendation method. The personalized tour route recommendation method comprises the steps that 1, travel note information of tourists is obtained and preprocessed; 2, a scenic spot type expression vector based on category information is obtained; 3, a touristy preference expression vector of each user, touristy preference expression vectors of the tourists in each month and an expression vector of each scenic spot are obtained; 4, a candidate tour route set is obtained according to step 1; 5, candidate tour routes are obtained from the candidate tour route set according to individual constraints; 6, a preference expression vector to which each tour route belongs is obtained; 7, similarity matching is carried out on the user touristy preference and the candidate routes to obtain the playing route which is most matched with the user touristy preference to serve as a final tour route recommended to the users. In the method, according toeach scenic spot in a historical tour track of the tourists and the scenic spot category information to which the scenic spots belong, the personalized touristy preference of the tourists is obtained.

The invention discloses a distribution switch mechanical state diagnosis method based on a vibration signal cluster. A vibration signal of a distribution switch is obtained through a sensor. The vibration signal is processed to obtain a plurality of eigenmode function components and remnant components to carry out the Hilbert conversion. The waveform reconstruction is carried out on the two-dimensional Hilbert time-frequency spectrum of each eigenmode function according to the frequency section to obtain a reconstruction component in the frequency section. A time-frequency matrix is constructed for the reconstruction components on all frequency sections, and the singular value decomposition is carried out on the time-frequency matrix to obtain a series of singular value vector quantities capable of reflecting the vibration signal time-frequency characteristics. The obtained singular value vector quantities of all vibration signals are combined into a comprehensive singular value matrix to serve as the diagnosis characteristic quantity of the distribution switch mechanical state. Different mechanical states of the distribution switch are recognized according to the cluster result of the comprehensive singular value matrix. The distribution switch mechanical state diagnosis method has the advantages that the mechanical states of the distribution switch can be effectively diagnosed, and different mechanical states can be intelligently recognized.

The invention discloses a time-digital converter. The time-digital converter comprises a phase interpolation circuit and a time-digital conversion circuit, wherein the phase interpolation circuit is used for receiving a first reference clock signal and a second reference clock signal, performing phase interpolation on the first reference clock signal and the second reference clock signal to generate a third reference clock signal and outputting the third reference clock signal to the time-digital conversion circuit; the time-digital conversion circuit is used for receiving the third reference clock signal and a fourth clock signal, measuring the phase difference between the third reference clock signal and the fourth clock signal and converting the measured phase difference into a digital signal to be output, wherein the phase difference between the third reference clock signal and the fourth clock signal is smaller than that between the first reference clock signal and the fourth clock signal. According to the time-digital converter, while time accuracy is ensured, the number of delay units in use in the time-digital conversion circuit can be reduced.

This invention relates to one dynamic powerless compensation method, which comprises the following steps: connecting one static powerless compensation device in the distribution network; then real time testing the static dynamic powerless compensation device joint voltage, load current, thyristor control separation resistance current signals; computing out static dynamic powerless compensation device each relative capacity value to realize the control to the trigger angle in the thyristor separation resistance and paralleled thyristor breaking control.

The invention discloses an X-ray pulsar photon signal ground simulation system with high time-frequency stability, comprising a program control computer, a high time-frequency stability signal source, an electric control visible light source, an adjustable optical attenuator, an optical shielding cavity, a photomultiplier and an electronic reading circuit. The high time-frequency stability signal source is used for obtaining a pulsar cycle and outline data output by the program control computer, generating a trigger signal to synchronize the electronic reading circuit, generating a high time-frequency stability voltage, inputting the voltage to the electric control visible light source and controlling the electric control visible light source to generate the visible light with light power which is in direct proportion with the input voltage, wherein the visible light is attenuated into photon stream by the adjustable optical attenuator; the photomultiplier detects out that the photo stream generates electric pulse, calibrates the electric pulse by the electronic reading circuit and then outputs to the program control computer. The system has the advantages of high simulation reliability, high outline precision and high time precision and can be used as an experimental device for timing observation, weak signal treatment and navigation design.

The invention relates to a traveling wave distance measurement device based on a passive magnetooptic glass current transformer principle. A small voltage signal reflecting primary side current amplitude of a transmission line is obtained by adopting a passive magnetooptic glass electronic current transformer, and a high-speed acquiring circuit is controlled by a CPLD (Complex Programmable Logic Device) for recording and sampling 625KHz travelling wave data and starting the sampling of 20KHz criterion data. When the transmission line fails, the travelling wave distance measurement device judges whether the transmission line fails through the sampled 20KHz data, and controls a 625KHz high-speed sampling part to completely record high-speed sampled data comprising travelling signals and sends data to a background computer through communication, and the background computer automatically computes and recognizes a failed travelling wave head through a wavelet algorithm after obtaining dual-end circuit data, and realizes failure location of the transmission line according to different moments of the wave head arriving at a dual-end bus.

The invention discloses a cable type submarine earthquake monitoring system which comprises a main subsystem and a plurality of secondary extended subsystems, wherein the main subsystem is formed by connecting two earthquake monitoring shore base stations on a shore with a plurality of primary submarine earthquake monitoring stations in series, and forms an energy and data aggregation connection network of the submarine earthquake monitoring system; each secondary extended subsystem consists of a primary submarine earthquake monitoring station and a plurality of secondary submarine earthquakemonitoring stations cascaded layer by layer; each primary submarine earthquake monitoring station is used for realizing acquisition of earthquake data, carrying out digital processing on the collecteddata, receiving data sent by the secondary submarine earthquake monitoring stations connected with the primary submarine earthquake monitoring station, summarizing all the data and sending the data to the earthquake monitoring shore base stations; and each secondary submarine earthquake monitoring station is used for realizing acquisition of the earthquake data, carrying out digital processing onthe collected data, receiving the data sent by other secondary submarine earthquake monitoring station connected with the secondary submarine earthquake monitoring station, summarizing all the data and sending the data to the previous submarine earthquake monitoring station through an extended submarine cable.

The invention discloses a non-metal pipeline leakage positioning method based on an inverse transient analysis method. The non-metal pipeline leakage positioning method comprises the steps of measuring the data of the flow and the pressure of a pipeline in the leakage state and the non-leakage state respectively, and summarizing the unified characteristics of the pipeline in the leakage state andthe non-leakage state; establishing a non-metal pipeline leakage state inverse transient model; carrying out section classification on the pipeline by utilizing the unified characteristics of the pipeline in the leakage state and the non-leakage state, and determining the leakage pipeline section and the non-leakage pipeline section; carrying out primary leakage positioning on the leakage pipelinesection by using a pressure gradient method; providing an ant colony algorithm to determine a target parameter friction coefficient with the best convergence, and substituting the target parameter friction coefficient into a characteristic equation to obtain a calculation pressure head of a pressure measurement point; substituting the calculated pressure measurement head and the pressure measurement head measured by the experiment into the inverse transient model to find a minimum target function value; and substituting all the parameters of the corresponding positions into a pressure gradient formula to obtain the calculated position of the leakage point. The non-metal pipeline leakage positioning method can be easily achieved only by measuring the pipeline pressure and the flow parameters, so that the calculation speed is increased, and the calculation precision of the target function is ensured.

Provided is a transponder for transmitting navigation satellite time service information into a low frequency time-code time service signal. The device for providing a time service signal to an electric wave time service timekeeper comprises a low frequency time-code generating circuit, a carrier wave signal generating circuit, a modulator circuit, a power amplification circuit, a power supply, an outputting and sending unit, and the like, and is characterized in that the transponder is provided with an RS485 interface device, can receive a serial signal which is transmitted by a "navigation satellite time service information transponder", accords with an RS485 protocol and contains the satellite time service information, can obtain a 1 pulse per second (PPS) embedded in the signal and accurate time, and enables the sent low frequency time-code time service signal to have very high time service precision. According to the transponder provided by the invention, the electric wave time service timekeeper also can be used in the places or occasions that cannot receive the electric wave time service signal originally or stably. The outputting and sending unit of the transponder is formed by connecting a plurality of basic sending units in parallel, and one transponder can supply a signal source to many electric wave time service timekeepers.

The invention discloses a GNSS time service receiver and a time service implementing method thereof. The time service receiver comprises an antenna array, a multi-channel radio-frequency signal processing module, a control chip and a clock source module. The antenna array is used for receiving a radio frequency signal; the multi-channel radio-frequency signal processing module is used for carryingout down-conversion and analog-to-digital conversion on the received radio-frequency signal; the control chip is used for completing space-time adaptive anti-interference processing, baseband signalprocessing, time and position information extraction, and clock taming and holding of the radio-frequency signal by reading an algorithm program to obtain an accurate and stable timing result. According to the invention, the GNSS time service receiver has advantages of good anti-interference performance, high timing precision and high integration in a complex environment; and the high time serviceprecision and reliability of the GNSS time service receiver in a complex environment, especially in a complex electromagnetic environment can be guaranteed.

The invention discloses a time pulse synchronization method based on an RDSS satellite navigation system. According to the method, based on a local clock, time deviation between the local clock and BDT is worked out according to time stamps and deviation adjustment information which are carried by RDSS downlink signals; the time deviation is adjusted to an output local clock overflow flag, and a pulse per second is output at the overflow moment. Because the local clock is adopted as reference in the adjustment process, time synchronization reliability is effectively improved.

A delay time method for measuring motion system. The invention adopts the reception technique of GPS to measure the delay time of the system. The time delay test of analog quantity change use the signal generator to simulate the export of transmitter and access input module; use the spring down of the signal of saw tooth wave; record the moment when the change of big data occur in the monitoring and data collecting system library, which is the delay time of the system analog quantity diversification and transmission.

The invention relates to a dynamic reactive power compensation control method, and the method is characterized in that a static dynamic reactive power compensation device is incorporated into a power distribution network, then the system voltage, load current and current signal of a thyristor-controlled separable-type electric reactor on an access point of the static dynamic reactive power compensation device are monitored in real time, a susceptance value to be compensated of each phase of the static dynamic reactive power compensation device is calculated in real time, so that a trigger angle of a thyristor in the thyristor-controlled separable-type electric reactor and on-off of a thyristor in a parallel thyristor switched capacitor can be controlled. The method has the remarkable characteristics that the dynamic response time of the static dynamic reactive power compensation device is guaranteed by utilizing the open-loop control, and the steady accuracy of the entire device is guaranteed by utilizing the closed-loop control, so that the dynamic response time and the steady accuracy of the static dynamic reactive power compensation device can be guaranteed. The method can be applied to the field with rapid and frequent load change and has a good application prospect.

The invention discloses a Doppler compensation method for high-speed rail or aircraft VSAT broadband satellite communication. A server or an embedded system independent of a VSAT broadband satellite communication terminal is connected with the VSAT broadband satellite communication terminal and a GPS receiver or a Beidou receiver; software is operated by the server or the embedded system; Doppler frequencies generated by the high-speed rail or aircraft VSAT broadband satellite communication are calculated in real time according to the longitude, latitude and height data of a GPS or a Beidou navigator; the Doppler frequencies are supplied to the VSAT broadband satellite communication terminal in real time; the Doppler effect is dynamically compensated; therefore the existing non-high speed VSAT broadband satellite communication terminal can be applied to the broadband satellite communication of a two-dimensional or three-dimensional high-speed motioning rail or aircraft; any modification of software and hardware is unnecessary; the economic benefits are clear; and the technical risk is relatively low.

The invention relates to the technical field of remote sensing technologies and geographic information systems, in particular to a farmland portrait and pesticide fertilizer big data analysis method based on satellite remote sensing images for agricultural big data analysis, which comprises the following steps: 1) acquiring satellite image remote sensing data; 2) preprocessing remote sensing data;3) extracting crop planting types; 4) extracting plot vector information of the satellite image; 5) inputting attribute field information for the plot vector; 6) investigating the input plot attribute field, and 7) performing big data operation and screening analysis on the collected plot information. The farmland portrait and pesticide fertilizer big data analysis method based on the satellite remote sensing image has the advantages of being high in farmland data precision, high in refinement degree and high in data persuasion.

The invention provides a calculation method of timing relationship between GSM / TD dual-mode terminal systems. Time relationship of initial synchronization of a GSM / TD terminal timing system and corresponding time relationship between the two modes after time T are determined by utilizing the time relationship between a GSM frame and a TD-SCDM subframe. The timing synchronization method not only ensures the timing precision of the GSM / TD dual-mode terminal system, but also reduces GSM / TD dual-mode terminal systems clocks to one, thus simplifying the hardware complexity of the GSM / TD dual-mode terminal systems.

The invention discloses a synchronous fixed frequency microgrid operation control method and system, and belongs to the automatic field of an electric power system. The synchronous fixed frequency microgrid operation control system comprises a plurality of distributed energy resources; the output ends of the distributed energy resources are connected with the input end of an inverter; the output end of the inverter is connected to a microgrid; the control method is characterized by comprising the following steps: 1, a synchronous signal unit receives a satellite time signal; 2, a current control unit gives out a control signal to the inverter; and 3, the inverter outputs an alternating current signal; and the inverter adjusts the output automatically to enable the voltage amplitude value output by the output end to satisfy the power grid requirement. According to the synchronous fixed frequency microgrid operation control method and system, the characteristics of independent control offrequency and phase of the alternating current can be generated through the pulse signal sent through the synchronous signal unit and by combination with the inverter, so that the outputs of all thedistributed energy resources in the micro grid can be actively adjusted and controlled in the same time reference system, and the problem of power oscillation and problem in stability caused by the conventional alternating current power grid frequency control method can be overcome.

The invention provides a method and a device for transmitting stream media data, which solve the problem that the service quality of a media server is reduced because the time accuracy of delay system call or timer system call is poorer. The method in the embodiment comprises the following steps: reading data from a stream media file and then packing the data to obtain a plurality of data packets, and setting unloading time of each data packet; detecting whether the unloading time of the data packets arrives or not every preset time interval, and unloading the data packets to a transmission interface after determining that the unloading time of the data packets arrives, and transmitting the data packets by the transmission interface. For the media server providing the stream media data for a terminal through a network, the technical scheme using the embodiment can improve the service quality.

A low-voltage power distribution network time synchronization method belongs to the technical field of low-voltage power distribution. The method is characterized by comprising the following steps: 1)grading a low-voltage power distribution network in a power transmission direction; 2) injecting a time synchronization characteristic pulse signal into a root node intelligent terminal P of the first-stage low-voltage power distribution network, and receiving the time synchronization characteristic pulse signal at each group of P1-Pn of the first-stage low-voltage power distribution network to complete first-stage in-stage time synchronization; 3) respectively injecting time synchronization characteristic pulse signals into each group of P1-Pn of the first-stage low-voltage power distribution network, and receiving the signals at the sub-node intelligent terminal Q connected with the second-stage low-voltage power distribution network in the second-stage low-voltage power distribution network to finish inter-stage time synchronization; and 4), sequentially completing intra-stage time synchronization and inter-stage time synchronization of two adjacent stages of low-voltage power distribution networks on each stage of low-voltage power distribution network in the power transmission direction. The low-voltage power distribution network time synchronization method guarantees accurate time synchronization, and is low in cost, high in reliability, simple, easy to implement and convenient to use and popularize.

The invention discloses a high-time-accuracy seismic source hammer which comprises a hammer head, a hammer handle, a trigger tongue piece and a vibration signal receiver. The hammer head is provided with a hammer cavity allowing the trigger tongue piece to be contained, a first electrode plate is fixed on the top wall of the sealed end of the hammer cavity, a second electrode plate is fixed on the tail of the trigger tongue piece, and a longitudinal gap exists between the second electrode plate and the first electrode plate. When external striking is applied, the first electrode plate and the second electrode plate make contact, and generated electric signals are transmitted to a collecting instrument. The high-time-accuracy hammer can ensured the integrity of records obtained through seismic exploration, the excitation time of a seismic source can be confirmed accurately, time accuracy is ensured, exploration precision is ensured accordingly, and thus the high-time-accuracy source hammer is beneficial to the accuracy of seismic methods such as port and bridge concrete strength detection which have high requirements for time accuracy.

The invention discloses a vehicle driving blind area calibration method, device and equipment and a storage medium. The method comprises the steps: carrying out time synchronization on global positionsystem (GPS) data, inertial navigation system (INS) data and vehicle body sensor data when a current vehicle is detected to enter a signal blind area; after time synchronization, establishing a stateequation related to elevation, vehicle speed and road gradient based on a preset vehicle dynamics model and INS, and obtaining a corresponding state estimation function; and determining the final estimation parameters of the vehicle according to an interactive multi-model Kalman filter and a state estimation function, and correcting the current navigation result according to the final estimationparameters of the vehicle, so that the problem of signal drift of the inertial navigation system in a blind area for a long time is avoided, the estimation precision and time precision of the navigation estimation result are ensured, the navigation correction data has real-time performance and effectiveness, the vehicle navigation precision is improved, the implementation cost is low, and extra infrastructure does not need to be built.

The invention provides an RTC clock calibration method and an industrial field calibration device. According to the method, the cycle number of a reference clock or the cycle number of the reference clock subjected to frequency multiplication through a PLL circuit is collected through a set first timer, the cycle number of a work clock is collected through a set second timer, and the second timer and the first timer are enabled to synchronously start counting and synchronously end counting within preset time, thereby realizing RTC clock calibration of low-frequency crystal oscillator as working clock. According to the method, a high-frequency crystal oscillator of the device as a reference clock is used for calibrating a low-frequency crystal oscillator of the device as a working clock, thus the RTC calibration can be automatically executed by the calibration device, the calibration cost is saved, the dependence of the RTC calibration on the online client device is reduced, and the calibration device is suitable for the industrial field calibration device.

The present invention discloses a method for time synchronization of a wireless sensor, comprising a wireless gateway and at least one wireless sensor. The wireless sensor establishing a wireless channel connection with a wireless gateway, the wireless gateway sends instructions to the wireless sensor in a time calibration period including a WOR wake-up cycle and a duty cycle, and the wireless sensor calibrates the time of its own by receiving a calibration time packet of the wireless gateway.

The invention discloses a big dipper watch-timing device, belonging to the auxiliary technical field of a big dipper satellite, and mainly aiming at solving the problem that the existing watch-timing mode is hard to meet the requirement for timing a big dipper watch. An automatic timing device of the big dipper watch comprises a micro-programmed control unit (MCU) controller, a big dipper signal receiving module, a clock module, an input controller, a display driving device and a display device, wherein the big dipper signal receiving module, the clock module, the input controller and the display driving device are respectively connected with the MCU controller, and the display device is connected with the display driving device. The timing device is further internally provided with a switch controller connected with the MCU controller; and the display device is internally provided with a voice reminding device and a light source flashing device. The invention further provides a timing method of the timing device. On the premise that the normal work of a user is not influenced, the initiative timing of the big dipper watch is realized, the problem of the lagging of the timing caused by the misoperation of the user is avoided, and the application and popularization value is high.

The invention discloses a timing calibration method for a clock source in a chip and a related device, and the method comprises the steps: obtaining the temperature compensation corresponding to the real-time temperature of a first oscillator, so as to improve the calibration precision of the first oscillator; obtaining square wave signals of a preset number of second oscillators, and calculating the theoretical operation duration of the second oscillator corresponding to each square wave signal; calculating the number of square waves generated by the first oscillator corresponding to the square wave signal of the second oscillator according to the square wave signal of the second oscillator, and calculating the actual operation duration of the first oscillator according to the number of square waves and temperature compensation; calculating the actual time base of the first oscillator according to the time base of the second oscillator, the theoretical time length and the actual operation time length of the first oscillator; and calibrating the timing of the second oscillator according to the actual time base of the first oscillator. The method is simple, and the timing precision of the second oscillator is adjusted to be consistent with the precision of the first oscillator, so that the timing precision of the second oscillator is ensured to be accurate.