70results about How to "Eliminate time errors" patented technology

Said invention provides a mobile telephone time autocorrection method. It contains signal reception / transmitting unit, time signal sampling unit memory unit, central processing unit and display unit, said method mainly setting mobile telephone initial time, time adjustment cycle, and standard time source connection mode and time request , when need proceeding time correction, said mobile telephone automatically transmitting time request to standard time source and taking standard time then configuring said standard time as system time of mobile telephone to reach higher time precision by using normal quartz oscillator.

The invention discloses a method for detecting a random access leader. After a random access channel (RACH) signal is treated with the simplified time domain-related operation, noise mean estimation is carried out to each root sequence; an absolute threshold is then detected according to a signal obtained by the noise estimation and signals in a search window are detected; the signals which exceed the detection threshold are screened and then a timing position can be determined in a fast and accurate way so as to provide reliable uplink timing adjustment information to a mobile terminal, guarantee the accuracy of the uplink synchronization and effectively eliminate the timing error due to the over-sampling and reduce the false alarm in the detection.

An anti-cheating interference signal processing method of a GNSS time service type satellite receiver is disclosed. The method comprises the following steps of stepS1, using a satellite to broadcast time information of a message so as to carry out mutual examination, receiving a GNSS satellite signal of multi-mode multi-frequency points, and detecting whether there is performed signal cheating for satellite time information, if there is the signal cheating, using a punctual time method to carry out an anti-cheating action, and if there is not the signal cheating, entering into a stepS2; stepS2, detecting whether adjacent time difference value of a local clock difference is greater than a preset threshold, if the adjacent time difference value of the local clock difference is greater than the preset threshold, determining that there is signal cheating which is performed aiming at time service precision so that a satellite receiver uses an automatic position maintenance function and enters into a clock punctuality state or indicates that a time service is unavailable; and if the adjacent time difference value of the local clock difference is not greater than the preset threshold, determining that there is no cheating-type interference signal and withdrawing a program. In the invention, telegraph text comparison, time punctuality, automatic position maintenance and other methods are used so that a purpose of an anti-cheating time service type satellite receiver is reached. A realization mode is simple and is easy to process and product cost is not increased.

The invention discloses a system and a method for positioning underground coal mine staff based on RSS (received signal strength) and TOA (time of arrival) complementation, and belongs to the field of mine monitoring and communication. The direction of the staff is determined by the aid of a directional antenna, distance information of a staff positioning card reader and an identification card is detected by an RSS method with high accuracy in an area which possibly cannot be detected by a TOA method, distance information is detected in other areas by the TOA method with higher accuracy, processing delay is fixed, signals are repeatedly transmitted and received by a transmitting end and a receiving end, timing errors of timing equipment are eliminated, positioning information including identity information of the underground coal mine staff is generated and outputted, and the underground coal mine staff is accurately positioned. Under the condition of decreasing positioning equipment and positioning density, the problems that errors are large when a measured distance is long in a roadway by the RSS method and misreading is caused when the measured distance is short in the roadway by the TOA method are solved, so that the underground coal mine staff is accurately positioned.

The invention discloses a synchronous measurement apparatus based on high precision time reference triggering and a method thereof. The apparatus is characterized in that a FPGA is connected to a CPU, a GPS module, an acquisition module and a DAC respectively; a down-conversion apparatus, the acquisition module, the FPGA and the CPU are successively connected in series; the DAC, a voltage-controlled oscillator and a local oscillator module are successively connected in series; the voltage-controlled oscillator is connected to a sampling clock and a local oscillator respectively; the local oscillator module is connected to the down-conversion apparatus; and the GPS module is connected to the CPU. The apparatus and the method of the invention have advantages that through using the FPGA and the GPS, high precision measurement time reference is determined, and whole acquisition and processing accesses are synchronized to the GPS; a time error caused by non-synchronization in a measuring instrument is eliminated and high precision synchronization measurement is realized; recording, operation and enforcement are simple; and the apparatus and the method are not limited by a distance among a plurality of synchronous measurement instruments.

The invention discloses a mine TOA target positioning method for suppressing an NLOS time delay error. The method includes steps: firstly, positioning base stations and a positioning card are set; secondly, the positioning card sends distance detection signals to a positioning base station A and a positioning base station B; thirdly, a synchronous time delay and a timing error are eliminated by employing an SDS-TWR method; fourthly, a roadway random NLOS time delay error is suppressed by employing a Kalman filtering algorithm based on an innovation threshold; fifthly, a distance measured valueafter Kalman filtering based on the innovation threshold is calculated; sixthly, an error brought by a roadway fixed NLOS time delay error is eliminated according to a parameter fitting method; and seventhly, the target position of a to-be-positioned target is further estimated by employing a geometric algorithm. According to the method, the steps are simple, the realization is convenient, the roadway NLOS time delay error can be effectively suppressed, the mine TOA positioning precision can be effectively improved, the practicality is high, the usage effect is good, and the promotion and theapplication are facilitated.

Disclosed is a method used for synchronously collecting meteorological radar servo information and intermediate-frequency signals, the method preventing a contradiction that angle information and echoinformation do not correspond in terms of collection and storage, reducing the complexity of subsequent algorithms to a great extent and increasing a utilization rate of hardware storage resources. According to the method, a timing module is utilized to guarantee time reference synchronization between a comprehensive test device and a signal processor; a LabVIEW (Laboratory Virtual Instrument Engineering Workbench) event driven architecture and a parallel structure are utilized to realize synchronization of servo storage operation and intermediate-frequency echo collection, so that synchronization of front panel operation and angle information storage and echo signal collection is guaranteed; an accurate time-delay module is adopted to offset system transmission time delays and communication transmission time delays, so accurate synchronization of real-time data collection and regular backhaul servo information is realized; and readability and effective utilization rates of data filesare improved by adding time headers to each group of data. According to the method, synchronization of meteorological radar servo information storage and intermediate-frequency echo signal collectionis greatly realized.

The present invention discloses a film projection quality detection method, and relates to the data processing field. The method comprises: a detection controllers issues SPL of a sample to be tested to a projection server; after a projection server receives the SPL of a sample to be tested, the projection server informs a projector of playing any one CPL short movie in the SPL of the sample to be tested; when the CPL short movie starts to play, an acousto-optic detection instrument performs real-time collection the brightness data and sound data of the section of the CPL short movie on the air and perform real-time returning of the brightness data and the sound data to the detection controller; and the detection controller compares the collected data with the data of the CPL short movie stored in advance and regulates corresponding interfaces of related devices of projecting the CPL short movie according to a comparison result. The film projection quality detection method eliminates the timing sequence errors of the acousto-optic data detected by the acousto-optic detection instrument to ensure the validity of the test result, ensure that a movie theatre system is more automatic for the correction of the sound and the brightness of the projector and facilitate better projection quality of the movie theatre.

The invention relates to the technical field of distributed communication systems, and provides a bus system power consumption control method and device. When the method is used for bus control equipment, the method comprises the steps that initial setting information is transmitted in a broadcasting mode so that all node groups are enabled to start entering the working state or the dormancy state alternately; and time synchronization information is periodically transmitted in the broadcasting mode so that the nodes in working groups are enabled to correct dormancy countdown of the nodes according to the received time synchronization information. All the groups are enabled to the switched between the working state and the dormancy state via the aforementioned time-sharing dormancy mechanism so as to ensure that only a part of nodes are in the working state at the same time and the rest nodes enter the dormancy state, and time synchronization with the bus control device is realized by receiving the time synchronization information of the bus control device. The cumulatively generated time errors on all the nodes are eliminated by a time synchronization mechanism so that time synchronization can be ensured and thus the beneficial effects that total power consumption of the system is reduced and communication quality is guaranteed can be achieved.

The invention relates to a time calibration method and device, computer equipment and a storage medium. The method comprises the following steps: sending a first time calibration request to a server,and carrying out first time calibration on an internal RTC according to first time synchronization information when the first time synchronization information fed back by the server is received; and sending a second time calibration request to the server, and after second time synchronization information fed back by the server is received, performing second time calibration or re-performing firsttime calibration on the internal RTC according to the second time synchronization information and the current moment of the internal RTC. By adopting the method, time errors can be effectively eliminated, and higher time calibration precision can be achieved.

The invention belongs to the technical field of electronic circuits, and specifically relates to a metastable state eliminating circuit used for a TDC. The main structure of the metastable state eliminating circuit is composed of a first rising edge D trigger, a second rising edge D trigger, a third rising edge D trigger, a first falling edge D trigger and a second falling edge D trigger, wherein a D input end of the first rising edge D trigger and a D input end of the first falling edge D trigger are connected with external input signals; a Q output end of the second rising edge D trigger is connected with a clock signal input end of the third rising edge D trigger; and a Q output end of the second falling edge D trigger is connected with a D input end of the third rising edge D trigger. The metastable state eliminating circuit has the beneficial effects of being capable of effectively eliminating timing error caused by metastable state while ensuring that the result after time digital quantification and the traditional TDC have the same measuring range and resolution, and greatly improves reliability of TDC precision.

The invention discloses an information synchronization method and a piece of network equipment. The method comprises the following steps: collecting at least two business processes; selecting business processes of first electronic equipment in accordance with a first preset condition and network-side business processes corresponding to the first electronic equipment from the at least two business processes; determining a first time offset when the time information of the first business process of the first electronic equipment is different from the time information of the network-side first business process corresponding to the first electronic equipment; and adjusting the time information of the data information in the business processes of the first electronic equipment based on the first time offset.

The present invention discloses an embodiment of a browser timing method. The method comprises: a client browser reads a webpage code of a server and records actual time of a present client; the client browser executes the webpage code to trigger an initialized timing event and display timing time on a page; after a present timing event, the client browser calculates a time interval of triggering the next time of the timing event according to the total number of times of triggering the timing event, a minimum timing interval and total time elapsed since the start of executing the webpage code; and the client browser triggers the next time of the timing event after the calculated time interval is elapsed. The browser timing method can prevent the condition that errors generated by executing a code are accumulated; and after one time of synchronization of the client bowser and the server is finished, the client bowser can implement high-accuracy timing without the dependence on the Internet. The present invention further discloses an embodiment of a browser timing system, which can implement the embodiment of the browser timing method of the present invention.

The invention relates to a method and a device for precisely measuring arrival time of a jump edge. The method comprises the following steps of (1) calibration: providing multiple different standard arrival time signals, carrying out multi-stage time delay of one standard arrival time signal, subjecting signals to voltage collection and arrangement at standard specific times after each stage of time delay to obtain a feature voltage value group, obtaining feature voltage value groups of other standard arrival time signals, and forming a calibration table by multiple feature voltage value groups, multiple standard arrival times and time differences among front edges in a CLK period; (2) jump edge arrival time measurement: obtaining a to-be-detected feature voltage value group, finding a time difference between a to-be-detected arrival time and a front edge in a CLK period using the calibration table, and adding the time difference and the time of the front edge of the to-be-detected arrival time in the CLK period to obtain a to-be-detected jump edge arrival time. The measurement precision of the method is high, the measurement time interval is large, and the device structure is simple.

The invention discloses an IMU and GNSS data synchronous method based on a standard time scale. The IMU and GNSS data synchronous method comprises the following steps that T1, a PPS pulse signal is monitored in real time, when the PPS pulse signal arrives, a processor starts a timer and a counter, the timer takes an original parameter as the timing parameter, when the next PPS pulse signal arrives, the counter calculates the interval value of the two PPS pulse signals, the timer takes the interval value as the new timing parameter, and the timer and the counter are restarted; and T2, when it is monitored that the PPS pulse signals arrive, IMU data are read, through the system time T1 when the PPS pulse signals arrive, a time label of the IMU data are marked, and a time label of GNSS data at the UTC1 moment are updated, the system time t is a time value having the time period during starting of a system power supply, and UTC1 is the sum of the round number of the UTC time of the momentwhen the PPS pulse signal arrives and one. The data synchronization timing accuracy of the IMU and GNSS data synchronous method is higher.

The invention relates to a deviation eliminating method for improving the accuracy of a structural diagram, which is shown in the figure and used for explaining two-dimensional seismic data for oil exploration. The method comprises the following steps: calculating a time constant deviation correction value of each newly tested line according to the position of each point of intersection in an imaging area; after the residual deviation correction, calculating a time variable correction value of each data point of each tested line in the imaging area according to the newly tested line; completing variable time deviation correction of all newly tested lines in a work area; recalculating the deviation value of the newly tested line after the constant correction and the variable correction; and completing the deviation correction if the integral maximum residual time deviation is less than 5 ms. The invention eliminates time errors, furthest protects original data, avoids aberration phenomena of the structure and artificial edition afterwards, enables the whole space correction result to be more accurate and reasonable, ensures the accuracy of the structural diagram and is beneficial to the accurate explain of an underground structure.

This invention relates to simultaneous phase angle digital tracing method in the relative technique field and is characterized by the following: first inputting the simultaneous signals into radio measurement circuit to get the frequency division of outer crystal clock of CI and plug parameters of CR; then using the CI, CR as frequency division values input to the plug and division circuit.

The invention discloses a control system and method with three direct-current motors in forward-direction serial connection. The system is characterized in that eight IGBT modules form four bridge arms in a two-two serial connection manner, the four bridge arms are parallelly connected to the positive electrode and the negative electrode of a direct-current power supply, the three direct-current motors in forward-direction serial connection are serially connected with the four bridge arms, the three direct-current motors are connected with a reference voltage synthesizer sequentially through aspeed sensor, a current sensor, a speed adjusting module and a secondary PI controller, the reference voltage synthesizer is connected with a four-phase inverter through a PWM pulse generating unit,the four-phase inverter is connected with the reference voltage synthesizer through a current adjusting module and a primary PI controller, the four-phase inverter is connected to the PWM pulse generating unit through the reference voltage synthesizer, and pulse control signals generated by the PWM pulse generating unit controls the on and off of the eight IGBT modules to drive the three direct-current motors to operate. The control system is few in used circuit components, simple in structure, stable and reliable in performance and worthy of popularization and application.

A system and method for regenerating optical signals comprising a clock recovery circuit coupled to a transmission line, a first optical gating device having an input port coupled to the transmission line and a clock port coupled to the clock recovery circuit, and a second optical gating device having an input port coupled to a continuous wave (CW) laser and a clock port coupled to the output of the first optical gating device, wherein the optical gating devices may be terahertz optical asymmetric demultiplexers (TOADs).

The invention discloses an optical fiber polarization sensing lightning positioning system based on space division multiplexing. The system comprises a first host and a second host, the first host andthe second host are connected through two optical fiber composite overhead ground wires. A first light source, a first circulator, a first filter, a first polarization analyzer and a first photoelectric detector of the first host are sequentially connected, and a second light source, a second circulator, a second filter and a second polarization analyzer of the second host are sequentially connected with a second photoelectric detector in the first host; the first photoelectric detector and the second photoelectric detector are connected with a high-speed acquisition card, and the high-speedacquisition card is connected with an upper computer; the first light source emits a direct-current optical signal with a first wavelength, the second light source emits a direct-current optical signal with a second wavelength, and the first wavelength is different from the second wavelength. According to the invention, thunder and lightning positioning and signal acquisition are achieved based ona method for double-end correlation single-end detection, so that the technical problems that the requirement of a traditional double-end method on a two-end time synchronization system is high and ameasurement dead zone exists in a single-end method are solved.

The invention belongs to the technical field of optical measurement, and in particular relates to a near backscattered light measurement system resistant to stray light interference. The measuring system includes a sampling device and a measuring device. The sampling device includes a spherical vacuum target chamber and an imaging lens. A target and a diffuse reflection plate with a targeting laser channel are disposed in the spherical vacuum target chamber. The diffuse reflection plate is attached to the inner wall of the spherical vacuum target chamber. The sphere wall of the spherical vacuum target chamber is provided with a measuring window. Near backscattered light produced by a targeting laser incident target is scattered in the opposite direction of the targeting and then is subjected to diffuse reflection through the diffuse reflection plate, and diffuse reflection light penetrates the measuring window and then enters the measuring device through the imaging lens. The imaging lens images the diffuse reflection plate on a one-time image plane, the plane where the one-time image plane is located is provided with an isolation screen, and the isolation screen is provided with aplurality of light holes. According to the near backscattered light measurement system, by arrangement of the isolation screen, the possibility that stray light scattered by the inner wall of the target chamber enters a diagnostic light path is eliminated, and the stray light shielding effect is achieved.

The invention belongs to the technical field of ocean information detection, and discloses an ocean information detection cluster system and a detection method. The system is provided with a pluralityof underwater instrument collection units fixed on a rope. The system is also provided with a plurality of overwater wireless communication responders, arranged on the special workboat or dragged orfloated on the water surface; a controllable computer, in wireless connection with the underwater instrument acquisition unit and the overwater wireless communication transponder. The state of the underwater instrument acquisition unit is sent to the overwater wireless communication transponder on the sea surface in a coding form. The controllable computer is connected to a specified working platform through a network to realize remote control of the ocean information detection cluster system. The defects that an existing seabed underwater instrument collection unit cannot achieve real-time communication and data transmission on the seabed, the working state of the seabed underwater instrument collection unit on the seabed cannot be known, and collected data cannot be monitored in real time are overcome. And the manufacturing cost is reduced and the time precision is improved by using a real-time time service technology.

The invention provides a radar precision analysis method based on distance alignment, and the method comprises the steps: allowing an aircraft to carry positioning and navigation equipment and fly back and forth at a constant speed, and obtaining the target trace point information of the aircraft by a radar; obtaining flight path information of the aircraft by the radar and obtaining flight path information recorded by the positioning and navigation equipment carried by the aircraft; converting a radar base station and the flight path information of the aircraft into a station center coordinate system taking the radar as a circle center; compensating the aircraft flight path information data obtained by the radar and the aircraft fight path information data obtained by the positioning andnavigation equipment; and comparing the compensated aircraft flight path information data measured and calculated by the radar with aircraft real flight path information data, solving an error value measured and calculated by the radar, and obtaining radar echo calculation flight path information accurate data by solving a mean value of errors and a variance. Time errors caused by echo time delayand system time delay can be effectively eliminated, and the purpose of improving the radar precision analysis precision is achieved.