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 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 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 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 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 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 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.