31results about How to "Guaranteed Time Synchronization" patented technology

The invention relates to a device and method for analysis and test of a high-speed grinding characteristic of a rotary part. The device mainly comprises a high-speed grinding wheel spindle system, a workpiece spindle system, a force measurement device for testing cylindrical grinding force, a cylindrical grinding workpiece and a temperature test device of the cylindrical grinding workpiece, and the device is used for analyzing and researching grinding force, grinding heat, a computing method of a coupling effect and a software system. Simultaneously, the grinding force and the grinding heat in a high-speed grinding process of the rotary part are collected so as to discriminate effect of mechanical energy and heat energy in the high-speed grinding process on workpiece surface quality and grinding wheel wear mechanism, and testing accuracy and efficiency of the grinding force of the rotary part are improved greatly. By means of a reverse heat flux calculation method and an algorithm, heat flux entering the workpiece, the grinding wheel and the like is obtained, effect of a high-speed grinding process on the workpiece surface quality and the grinding wheel wear mechanism is disclosed, grinding process parameters and the like are optimized further, high-speed grinding characteristics of different workpiece materials can be disclosed, and further optimization design of the high-speed grinding process and main configuration of the process is performed.

Disclosed are a time synchronization processing method and apparatus. The method comprises: determining a time stability index of a node according to a time deviation value of the node within a preset period of time, where the time deviation value is a delay of a clock signal of the node relative to a reference clock signal within the preset period of time, and the time stability index comprises at least one of the following: a time compensation accumulated value within the preset period of time, a maximum time compensation value within the preset period of time, a time compensation average value within the preset period of time, and a time fluctuation value within the preset period of time; determining whether the time stability index of the node exceeds a preset range; and in a case that the time stability index of the node exceeds the preset range, sending a time synchronization exception alarm. In this manner, by means of the present invention, the problem that time stability of a network or device cannot be detected in the prior art is solved, so as to detect time stability of a network or device in real time according to a time stability index, and ensure time synchronization performance.

The embodiment of the invention discloses a method and equipment for synchronously counting multimedia broadcast multimedia service (MBMS). The embodiment of the invention has the following advantages: by applying the technical scheme of the embodiment of the invention, carrying the synchronous time point information in the information sent to a base station by an MBMS coordinating entity (MCE) and ensuring the base station to count MBMS in the corresponding synchronous time point, collect the counting information and feed back the counting information to the MCE, wherein the base station can count MBMS of each terminal equipment served by the base station in the same time point and collect and transmit the MBMS counting information to the MCE, thus ensuring synchronization of MBMS counting time, ensuring synchronization of multicast control channel (MCCH) contents at the air interface and solving the problem that synchronization of MBMS counting time can not be ensured in the existing technical scheme.

The invention discloses a locomotive comprehensive information recording device and a recording method. The device comprises a main recording module, wherein the main recording module comprises a main processor unit, a main network interface unit, a main storage unit and a main power supply unit; the main network interface unit comprises a plurality of bus interfaces which are connected with a locomotive bus; the main processor unit is respectively connected with the main network interface unit and the main storage unit; information acquired by the main network interface unit is coded in a unified manner and is stored in the main storage unit; and the main power supply unit respectively supplies power for the main processor unit, the network interface unit and the main storage unit. The device has the advantages that synchronization of time of various locomotive-mounted information devices can be guaranteed effectively, the information of the various locomotive-mounted information devices on a locomotive can be coded, stored and managed in a unified manner, data integrated level is high, integrity is good, users can use the information conveniently, the information is fused and analyzed comprehensively, the utilization value of the information is increased effectively and the like.

The invention discloses a time synchronization algorithm based on a loosely coupled IMU array navigation system. An error model of an IMU array navigation system is established, a system equation containing a time synchronization error is established based on the model, and a time synchronization error as a state variable is introduced into a state space model to serve as a state estimation amount; with a fractional delay filter, time displacement is performed on the time synchronization error, interpolation is performed on amplitude and phase responses of the fractional delay filter by usingthe Lagrange's interpolation to obtain displacement of the inertial sensor data so as to ensure time synchronization of the inertial sensor; and carrying out error compensation on the delayed inertialsensor data, inputting the inertial sensor data after time displacement and error compensation into a navigation equation of the inertial navigation system, and carrying out navigation calculation toobtain actual navigation parameters. According to the disclosed method, no extra hardware is needed; and the computation load of the navigation system is reduced.

The invention discloses a synchronous data acquisition method based on a wireless sensor network, which mainly solves the problems of detection error, positioning error caused and the like by GPS (Global Positioning System) timing error. In the method disclosed by the invention, PPS(Pulses Per Second) and GPS timing information are harmonized to be synchronous for three times so as to reach time synchronization of all the sensing nodes; a peak window method is adopted to judge the PPS State legitimacy so as to ensure time synchronization; a high-speed clock is used to maintain a local time scale so as to decide whether to amend the current time scale in real time; and automatic updates are conducted each 40 seconds. If the acquisition time point required by an FPGA(Field Programmable Gate Array)analytical management center is ahead of the current time scale, a time overflow error is reported to inform the management center to give a command again; if the acquisition time point required by the FPGA analytical management center is behind the current time scale, a receiver is turned off at time of one second before the next acquisition time point; the receiver is turned on to acquire the data at the time point required by the management center. With the method disclosed by the invention, the accuracy and the robustness of GPS timing of the sensing nodes of the wireless sensor network are improved. The method is applicable in collaborative signal detection and positioning data acquisition of the nodes of the wireless sensor network and the like.

The invention relates to the industrial wireless network technology, in particular a low-overhead time synchronization method based on receivers under a star network. By sufficiently considering the application feature of an automatic star wireless network, the time synchronization method provided by the invention comprises the following steps: using a clock source device in the star network as one of receivers by using synchronized thought between the receivers based on IEEE STD 802.11-2007 standard and TDMA mechanism, comparing a receiving time value of the clock source device with that of a slave clock device so that the slave clock device can obtain an accurate time deviation value. Through the adoption of the method disclosed by the invention, the influence from transmission delay to timestamp data is eliminated, the target of precise time synchronization in the premise of high efficiency and low-overhead is realized.

The invention discloses a method and a system for improving the SOC calculation precision of an electric vehicle power battery. According to the invention, the method comprises the steps of acquiring the voltage of each battery, determining a limit monomer battery, measuring the limit voltage, calling the current of the corresponding time, recognizing model parameters to obtain an open-circuit voltage, predicting a stable open-circuit voltage after standing for a period of time, obtaining an SOCnew according to the SOCSnew-OCV relationship, and updating the SOCnew in the ampere-hour integral method. according to the invention, the open-circuit voltage method, the model method, the ampere-hour integral method and the prediction are combined. The SOCnew in the ampere-hour integral method is continuously updated, namely the initial SOC. Therefore, the accumulative error is reduced.

The invention discloses a dynamic compensation pulse circuit which comprises a signal generation module for generating a primary second pulse signal, a standard signal module for receiving a standardsecond pulse signal and capturing a rising edge time point of the standard second pulse signal; a processor for generating an updating storage value according to the rising edge time point of the standard second pulse signal; a signal adjusting module which is connected with the signal generating module and the processor and is used for receiving the updating storage value; wherein the signal adjusting module is started by the primary second pulse signal, and transmits the updating storage value to the signal generation module; and the signal generation module generates an update second pulsesignal according to the updating storage value. The method has the advantages and beneficial effects that the influence of channel transmission delay on time synchronization clock precision is eliminated, and the clock synchronization of the dynamic compensation pulse circuit and the standard time source is realized. The clock synchronization between the standard time source and the synchronized device is guaranteed, the structure is simple, and the cost is low.

The invention discloses a synchronous playback method. When receiving a synchronous playback request message from a receiver, a server sends the synchronous playback request message to specific sender; a specific field in the synchronous playback request message includes identifiers of front-end devices which need synchronous playback, and the specific sender stores video monitoring data of the front-end devices, so that the server establishes a session between the receiver and the specific sender via session configuration information of the sender, and then the receiver can receive the video monitoring data corresponding to the front-end devices synchronously via the session; and thus, required preparation time for synchronous playback of the front-end devices is reduced, and it is ensured that videos are played back synchronously.

The invention discloses a time calibration system and method, electronic equipment and a storage medium. The method comprises the following steps: acquiring a digital signal and attitude data, wherein the attitude data is obtained according to an inertial sensor in a turntable unit; analyzing the digital signal to determine the emission time of the laser signal corresponding to the digital signal; reading a target angular velocity corresponding to the emission time from the emission time; and calculating a time error between an output moment corresponding to the attitude data and an emission time corresponding to the laser signal based on the target moment and the target angular velocity, and carrying out time calibration according to the time error. According to the embodiment of the invention, the time error between the output time corresponding to the attitude data and the emission time corresponding to the laser signal is calculated according to the attitude data and the digital signal converted from the laser signal, and the time of the system can be subsequently calibrated by using the time error, so that the jitter error generated in each link is effectively avoided, and the calibration accuracy is improved. And time synchronization of the laser signal and the attitude data is ensured.

The invention relates to a small inertia self-rotation-eliminating control method and system for a spatial remote-sensing scanning imaging system. The method comprises: step one, planning a motion curve of a rotation eliminating system; step two, optimizing a rotation inertia of the rotation eliminating system; step three, setting a time aligner and acquiring a rotation eliminating system angularposition theta <*>e at a same time of a scanning imaging system; step four, setting an error compensator output Tse; and step five, planning a motion curve of the rotation eliminating system by usingrotation eliminating system rotation inertia minimization as an objective, introducing error compensation Tse by using the rotation eliminating system angular position theta <*>e calibrated by the time aligner as a control input, and carrying out rotation eliminating controlling on the scanning imaging system. Therefore, the rotation inertia of the rotation eliminating system is minimized while the index requirement is met. When the rotation inertia of the rotation eliminating system is reduced, the motion characteristics change subsequently; on the basis of implementability of the mechanism design, the motion characteristics and the rotation inertia of the rotation eliminating system are optimized, so that the interference torque of the scanning imaging system is cancelled by the small inertia rotation eliminating system.

An Ethernet bus system for a carrier rocket comprises a telemetering module, a data interpretation and voting module, a time synchronizer, a plurality of sensors, an Ethernet bus A and an Ethernet busB, wherein the Ethernet bus A and the Ethernet bus B are hot backups for each other. The time synchronizer is used for ensuring the time synchronism of the Ethernet bus A and the Ethernet bus B. Busterminals of the Ethernet bus A and the Ethernet bus B are connected with sensors, acquire data of the sensors according to a fixed period, and store the data and acquisition time information in a data cache region. The Ethernet bus A and the Ethernet bus B respectively compile the acquired data into telemetry data frames and send the telemetry data frames to the data interpretation and voting module; the data interpretation and voting module interprets the two groups of telemetering data frames and uploads the telemetering data frames without abnormality to the telemetering module; and the telemetering module modulates the received telemetering data frame and sends the modulated telemetering data frame to ground receiving equipment. Time synchronism and real-time performance can be guaranteed, system reliability is improved, and the using requirement of a carrier rocket is met.

The invention discloses a multi-base coordinated radio detection system and a multi-base coordinated radio detection method. The multi-base coordinated radio detection system transmits a frequency-modulation stepping signal and communication data to a slave base station by means of a master base station; the slave base station obtains a first clock signal from the communication data, and adjusts alocal clock signal according to the first clock signal to obtain a second clock signal, determines first receipt time of the frequency-modulation stepping signal transmitted from the master base station based on the second clock signal, and determines second receipt time of a reflected frequency-modulation stepping signal reflected by means of a detection target; and the first receipt time and the second receipt time are regarded as detection information and transmitted to the master station by means of an Ethernet. The master base station determines position information of the detection target based on the detection information by adopting a time difference positioning method, and ensures the time synchronization of radio detection devices at a plurality of points, thereby improving thedistance precision, improving the multi-pulse accumulation effect of the radio detection devices of multiple base stations, and further enhancing the distance detection ability.

The invention discloses a power Internet of Things wireless sensor time synchronization system and method. The system comprises a root wireless sensor, at least two secondary root wireless sensors and a plurality of wireless sensors; the secondary root wireless sensors are used for sending a grouping starting message to the plurality of wireless sensors, the plurality of wireless sensors are grouped according to the grouping starting message, and each group of wireless sensors respectively correspond to each secondary root wireless sensor; the root wireless sensor is used for sending a synchronous broadcast signal to the secondary root wireless sensors, and the secondary root wireless sensors are used for recording the arrival time of the synchronous broadcast signal according to the local time of the secondary root wireless sensor and sending the arrival time to other secondary root wireless sensors; each secondary root wireless sensor adjusts the clock of the secondary root wireless sensor according to the received arrival time; each group of wireless sensors is used for carrying out bidirectional message exchange with the corresponding secondary root wireless sensor so as to realize time synchronization; and according to the method, the synchronization precision and the algorithm power consumption can be well balanced.

The invention discloses a multi-base cooperative radio detection system and a detection method. The system transmits FM step signal and communication data to the slave base station through the master base station. Obtain the first clock signal from the communication data from the base station, adjust the local clock signal according to the first clock signal to obtain the second clock signal, determine the first receiving time of the frequency modulation step signal transmitted by the main base station based on the second clock signal, and detect The second receiving time of the reflected FM stepping signal reflected by the target; the first receiving time and the second receiving time are used as detection information, and are sent to the main base station through the Ethernet. The main base station uses the time difference positioning method to determine the location information of the detection target based on the detection information, ensuring the time synchronization of the radio detection devices at multiple points, thereby improving the distance accuracy; improving the multi-pulse accumulation effect of the radio detection devices at multiple base stations, thereby improving detection distance capability.

The present invention relates to a method and system for abnormality detection of a secondary measurement circuit in a substation and a switching station. The method includes: correcting the time of the terminal equipment corresponding to the switch on the bus, and obtaining the three times of the terminal equipment corresponding to the switch with a time mark. Phase voltage, use the three-phase voltage of the terminal equipment corresponding to the switch with the same time mark to detect the abnormality of the busbar, the secondary measurement circuit of the voltage transformer of the switch on the busbar and the secondary measurement circuit of the current transformer of the switch on the busbar, adopt The above-mentioned technical solution can quickly detect the abnormal situation of the secondary measurement of the substation and the switch station, and effectively improve the detection sensitivity.

The invention discloses a method and system for measuring the focal spot of a high-power laser cluster far-field combination. technical problem. The measurement system of the present invention includes a sampling mirror group, a collimating negative lens group, a first attenuation mirror group, a magnifying mirror group and a CCD which are sequentially arranged along the optical path; Sampling mirror Ⅱ and sampling mirror Ⅰ respectively equipped with light holes; both sampling mirror Ⅱ and sampling mirror Ⅰ are parabolic mirrors, and the concave surfaces of the two are opposite; the collimating negative lens group is used to collimate the sampled beam Carry out beam reduction and collimation; the first attenuation lens group contains at least two attenuation sheets, and the angle between the normal of each attenuation sheet and the beam is θ, 10°<θ<20°; the magnifying lens group is used to adjust the attenuation The beam after amplification is enlarged; CCD is used to acquire the image of the beam after amplification.

The invention relates to a small inertia self-rotation-eliminating control method and system for a spatial remote-sensing scanning imaging system. The method comprises: step one, planning a motion curve of a rotation eliminating system; step two, optimizing a rotation inertia of the rotation eliminating system; step three, setting a time aligner and acquiring a rotation eliminating system angularposition theta <*>e at a same time of a scanning imaging system; step four, setting an error compensator output Tse; and step five, planning a motion curve of the rotation eliminating system by usingrotation eliminating system rotation inertia minimization as an objective, introducing error compensation Tse by using the rotation eliminating system angular position theta <*>e calibrated by the time aligner as a control input, and carrying out rotation eliminating controlling on the scanning imaging system. Therefore, the rotation inertia of the rotation eliminating system is minimized while the index requirement is met. When the rotation inertia of the rotation eliminating system is reduced, the motion characteristics change subsequently; on the basis of implementability of the mechanism design, the motion characteristics and the rotation inertia of the rotation eliminating system are optimized, so that the interference torque of the scanning imaging system is cancelled by the small inertia rotation eliminating system.

The invention discloses a method and system for synchronizing digital audio and video. The system is composed of an audio and video acquisition device and a host controller. The method includes the following steps: the host controller generates periodic signals, and the generated The periodic signal is sent to the audio and video acquisition device; the audio and video acquisition device calibrates the audio clock signal generated by itself according to the received periodic signal, and samples the audio signal according to the calibrated audio clock signal to obtain audio data; at the same time, The audio and video acquisition device calibrates the video clock signal generated by itself according to the received periodic signal, and samples the video signal according to the calibrated video clock signal to obtain video data; the audio and video acquisition device calibrates the audio data and video data sent to the host controller, and the host controller decodes the received audio data and video data according to the periodic signal. The invention also discloses an audio and video collection device.

The invention relates to a method for testing satellite-earth time synchronization in a satellite semi-physical simulation test. The method comprises the following steps: S1, establishing a satellite dynamics simulation model, and operating the satellite dynamics simulation model in a satellite dynamics simulation computer; S2, generating a synchronous second pulse signal, and separately sending the synchronous second pulse signal to an on-board computer and the satellite dynamics simulation computer; S3, receiving, by the satellite dynamics simulation model, a time signal sent by the on-board computer in real time, comparing the time signal with a time signal corresponding to the second pulse signal, taking the time signal sent by the on-board computer as an orbit calculation time after a judgment is correct, and obtaining a satellite attitude quaternion through calculation; and S4, adopting a star sensor electrical signal source to receive the satellite attitude quaternion sent by the satellite dynamics simulation computer, simulation in-orbit star sky, transmitting the simulated in-orbit star sky to a star sensor, and then forming closed-loop control with the on-board computer through the star sensor. A time delay in data transmission can be reduced, time synchronization between the on-board computer and the ground satellite dynamics simulation computer is guaranteed, and test precision of a satellite control system is improved.

The invention relates to a method for operating a digital interface device and to a digital signal for exchanging data between at least one digital control device in the baseband of a communications terminal and at least one digital radio transmitter / radio receiver of the communications terminal. Interface device, in which the baseband control device is connected to a first number of parallel available data channels for data exchange via a first interface device, and each radio transmission / radio reception control device is connected via a second interface device. Each is connected to at least part of the data channels available in parallel for data exchange, wherein the first interface device and the second interface device, when there are at least two groups, are implemented by means of a multiplexing method on the data channels contained in these groups. Basically simultaneous data transfer.

The invention discloses a synchronous playback method. When receiving a synchronous playback request message from a receiver, a server sends the synchronous playback request message to specific sender; a specific field in the synchronous playback request message includes identifiers of front-end devices which need synchronous playback, and the specific sender stores video monitoring data of the front-end devices, so that the server establishes a session between the receiver and the specific sender via session configuration information of the sender, and then the receiver can receive the video monitoring data corresponding to the front-end devices synchronously via the session; and thus, required preparation time for synchronous playback of the front-end devices is reduced, and it is ensured that videos are played back synchronously.

The invention discloses a dynamic compensating pulse circuit, comprising: a signal generating module for generating a preliminary second pulse signal; a standard signal module for receiving the standard second pulse signal and capturing the rising edge time point of the standard second pulse signal; processing The device is used to make an update storage value according to the rising edge of the standard second pulse signal; the signal adjustment module is connected to the signal generation module and the processor respectively, and is used to receive the update storage value; the signal adjustment module is started by the preliminary second pulse signal, The updated stored value is transmitted to the signal generation module; the signal generated module generates an updated second pulse signal according to the updated stored value. The advantages and beneficial effects of the present invention are: the influence of the channel transfer delay on the accuracy of the time synchronization clock is eliminated, the clock synchronization between the dynamic compensation pulse circuit and the standard time source is realized, and the clock between the standard time source and the synchronized device is guaranteed Synchronization, simple structure and low cost.

The invention discloses an automatic test method for a modular electromechanical integrated management system. The method is used for an electromechanical system of a large aircraft and comprises thefollowing steps that: test equipment is in automatic test connection with a tested object, wherein an instruction protocol format of the automatic test connection is set to be a start bit, a check bit, a version, a timestamp, a type, a length and data; the test equipment automatically tests the tested object, and in the automatic test process, the test equipment and the tested object realize longconnection and synchronization and keep an expected action consistent with a tested action; and time synchronization operation is performed in an automatic test execution process. The invention provides an automatic test method for an electromechanical system, which is characterized in that automatic test linking, automatic execution and automatic time synchronization are realized, the time synchronism of a test process and an automatic comparison mechanism of test expectation and results are ensured, the test workload is reduced, and the test quality is improved.

The invention provides a business data processing method, a client, a server and a system, and the method comprises the steps that when a user starts to use a charging service of the client, the client obtains a current timestamp, a service number and a reporting interval second number from the server; the client uploads a section of business data to the server every other reporting interval second until the user ends the charging service, and the business data at least comprises a service order number, a time sequence, a business data number and an end identifier; and the server deduplicates all the time sequences, determines the total time length of using the payment service by the user based on the deduplicated time sequences, and determines the total time length of using the charging service by the user. In the scheme, the client acquires the current timestamp from the server before timing, and the server determines the total time length of using the payment service by the user based on the deduplicated time sequence after deduplicating all the received time sequences, so that the time synchronization of the client and the server is ensured, and the charging accuracy of the server is improved.

The invention relates to a synchronous impact loading method for a large-area complex curved surface. The synchronous impact loading method comprises the following steps: uniformly mixing photosensitive explosive powder in a liquid dispersant; the load needing to be loaded by the target object is converted into the loading thickness of the photosensitive explosive; according to the converted charging thickness, the moving track of a spray gun in spraying operation is planned; spraying the photosensitive explosive coating on the surface of the target object according to the planned moving track by using a spray gun to form an explosive coating; drying the explosive coating on the surface of the target object; a strong flash light source is arranged, strong light generated by the light source irradiates all the explosive coatings, and synchronous detonation impact loading on the large-area complex curved surface is achieved; according to the method, the large-area complex curved surface can be synchronously detonated and loaded.