45results about How to "Improve real-time accuracy" patented technology

The invention provides an engineering standardized construction process control method on the basis of BIM (building information modeling). The method comprises a construction scheme analysis step, a BIM model association step, an on-site task prompt step, and an on-site data collection step. The invention also provides a corresponding system. According to the engineering standardized construction process control method and system on the basis of the BIM, each construction procedure is created or searching is performed to obtain a corresponding subtask, the subtask is associated with building components in a BIM model, according to instructing information such as subtask prompt, operation instruction and the like, the engineering which is completed and executed step by step is namely standard engineering; retention of on-site data collection can be performed in a engineering process, is convenient for tracing in the future, and remote control on live on-site construction is also convenient to be performed.

The invention relates to a method for utilizing forwarding range finding value and pseudo range value to determine GEO navigation satellite clock error. The method comprises the following steps: obtaining GEO navigation satellite transponder time delay value, forwarding range finding value, pseudo range finding value and synchronization forwarding range finding value through laser measurement and definitive orbit calculation, converting the synchronization forwarding range finding value as original satellite ground distance value, and carrying out ionosphere correction on the original satellite ground distance value and the pseudo range finding value to respectively obtain ionosphere corrected satellite ground distance value and ionosphere corrected pseudo range measured value; figuring out real-time GEO navigation satellite clock error; and obtaining satellite transponder time-delayed actual value and after precise GEO navigation satellite clock error through after precision definitive orbit calculation. According to the method, clock error product with second time interval can be provided to improve real-time precision of a navigation positioning system. Also the calculating method used in the invention is simple, thus error in the calculating process is effectively minimized.

The invention provides a robot indoor positioning method based on ceiling images. The method comprises the following steps of arranging a pattern obviously different from an image in an adjacent vision field on a ceiling; programming to make a robot traverse indoor positions, shooting pictures through a camera on the top, and splicing collected images to obtain a global image; comparing the actualindoor size with the pixel size of the global image, and obtaining coordinate conversion relationsbetween image coordinates and actual coordinates; calculating the pose of the robot in the global image through an optical flow method and image matching, and according to the coordinate conversion relations, determining the current actual pose of the robot. The robot indoor positioning method basedon the ceiling images calculates the pose of the robot in the global image through the optical flow method and image matching, and determines the current actual pose of the robot according to the coordinate conversion relations. The robot indoor positioning method based on the ceiling images is high in adoptability and good in stability.

The invention discloses a self-adaptation flow control method suitable for wireless projection system real-time data transmission. The method includes the following steps: 1, a low pass filter is introduced in to calculate a smooth packet loss rate; 2, according to a network packet loss rate fed back by a receiving end, a network band width is divided into a jam state, an idle state and a full-load state; 3, the network state is judged to adjust transmitting speed in real time, if the network state is of the jam state, the transmitting speed is reduced and if the network state is of the idle state, the transmitting speed is increased, a loss rate of a smooth packet passing through the low pass filter is recalculated at the current moment to prepare judgment of the network state next time, and if the network state is of the full-load state, through calculation of integral marked quantity of transmission delay and delay jitter of a network, the transmitting speed is adjusted; and 4, a loss rate of a smooth packet passing through the low pass filter is recalculated at the current moment to prepare judgment of the network state next time. According to the self-adaptation flow control method suitable for the wireless projection system real-time data transmission, adjustment errors and large-margin shocking of the transmitting speed are reduced, the defects that an application flow is strong in burstiness, large in jitter and the like are overcome, and the transmission service quality is improved.

A real-time translation method for a mobile device is disclosed. In this method, a location of the mobile device is provided by a global positioning system (GPS). Then, an image is captured, and characters shown in the image are recognized in accordance with a language used in the location of the mobile device. Thereafter, the characters recognized are translated in accordance with a translation database. Then, a translation result of the characters recognized is displayed.

The invention provides a method and a system for realizing real-time orbit determination for a single satellite navigation positioning system. The method comprises steps that a should-be-switched-to orbit determination work mode is determined according to a present orbit determination work mode and the available star number of the satellite navigation positioning system, and switching operation is carried out; the observation data of the satellite navigation positioning system is transferred from an earth-fixed coordinate system to an orbit coordinate system through coordinate transformation; the observation data after coordinate transformation is inputted to a Kalman filter, time update for the state quantity of the Kalman filter is carried out, and orbital element one-step forecast is acquired; measurement update for the state quantity of the Kalman filter is carried out by utilizing the observation data of the satellite navigation positioning system. The Kalman filtering method on the basis of a dynamic orbit model and the system are employed, being closer to practical modeling, switching among different orbit determination modes can be realized, demands of high precision real-time orbit determination and autonomous satellite navigation can be satisfied, and the method and the system can be applied to multiple types of satellite navigation positioning systems such as GPS, GLONASS, second-generation Beidou and GALILEO.

The invention provides a real-time data acquisition system and method. The real-time data acquisition system comprises a sensor, a DAQ device and a computer. The sensor, the DAQ device and the computer are sequentially connected. The DAQ device comprises a programmable logic device and an ADC analog-digital converter. The sensor is used for acquiring analog data, and the ADC analog-digital converter is used for converting the analog data into digital data. The programmable logic device is used for filtering the digital data to generate filtered data, and transmitting the filtered data to a buffer of the computer. According to the system and method provided by the invention, the system can be implemented by using a general purpose microprocessor and the programmable logic device, and is compatible with an existing data acquisition apparatus structure; programmable parallel computing is applied to data acquisition; a non-real-time factor caused by CPU instruction serial and operating system scheduling is overcome; and higher performance is realized with extremely low hardware costs.

The invention provides an endoscope image processing method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining an endoscope video stream which carriesan original endoscope image; detecting an original endoscope image in the corresponding video frame through a first thread, and transmitting a detection result of the original endoscope image to an integrator; forming a control instruction through an integrator according to the detection result of the original endoscope image; and in response to the control instruction, adjusting an output resultin the second thread through the second thread. According to the method, the output result can be controlled to be matched with the using environment of the endoscope video stream through the first thread and the second thread which are parallel, the real-time accuracy of endoscope image processing is improved, and the real-time recall rate is increased.

The invention relates a robot multi-source shortest path planning method based on territorial limitation. The distance between moving nodes with connected edges is set to the weight of the weight of the connected edges and the distance between moving nodes without connected edges is set to be infinity, so connection information between moving nodes is obtained and abstract maps are constructed. Bycomparing the set formed by all departure points and all target points and the set of solved shortest path moving nodes, the undetermined shortest path top point set at the current moment is obtained. According to the top point coordinates and the confidence coefficient of the shortest path in current undetermined shortest path top point set, the extreme value of the top point coordinate in the top point set is obtained, and a rectangular limitation searching region including the including whole departure point and the target point set is constructed. The shortest path of the departure pointsand the target points with connection edges is the weight of the connection edge. For other departure points and target points, a Dijkstra algorithm is used for determining the shortest path. According to the invention, path planning can be simply, conveniently and highly efficiently achieved and stability is high.

The invention provides a control method for improving performance of an automatic weighing and bagging system. The control method includes the steps of firstly, setting the feed speed, the sampling frequency and the number of sampling times, then, conducting function fitting on four closest sampling points to obtain forecast bagging weight reaching time, when a controller judges that the renewal stopping condition is met, if the renewal stopping condition can not be met, continuing to collect samples and conduct function fitting, and when discharge stopping time is reached, enabling the controller to control a hopper valve to stop discharging. By means of the control method, bagging can be conducted at the highest bagging speed within the range allowed by the system, and high bagging accuracy is achieved.

The invention discloses a sine force online calibration device based on piezoelectric ceramics. The calibration device and the calibrated sensor are integrated between a first part and a second part.The calibration device comprises a force transmission block, a standard force sensor, a piezoelectric stack and a locking mechanism. The force transmission block, the standard sensor and the piezoelectric stack are stacked and fixed in turn. The force transmission block is arranged between the calibrated sensor and the standard sensor. The locking mechanism locks the first part and the second part. The calibration device and the calibrated sensor are integrated on the calibrated equipment, the calibrated sensor does not need to be detached in calibration and in-situ online calibration can be performed on the calibrated sensor so that the calibration efficiency of the sensor can be enhanced, the influence of the working environment on the performance of the calibrated sensor is also fused in calibration and the calibration accuracy can be enhanced.

The invention discloses an artificial environment control system with an ultra-micro unmanned aerial vehicle and an operation method of the artificial environment control system. The system comprisesa temperature and humidity sensor, an ultra-micro unmanned aerial vehicle, the unmanned aerial vehicle lifting platform, an intelligent control center, a remote jet nozzle, an air supply outlet, a radiant heating and cooling system, an active cold beam, a moisture absorption device, an air purifier, an all-air system, a fan coil system and a fresh air system; a temperature sensor, a humidity sensor, an infrared radiation temperature sensor, a wind speed sensor and an air quality sensor are arranged on the ultra-micro unmanned aerial vehicle; and the system further discloses an operation methodof the artificial environment control system with the ultra-micro unmanned aerial vehicle. The multi-parameter movable type measuring technology and comprehensive air conditioner tail end equipment are adopted, the indoor environment can be accurately controlled, the human body heat comfort degree of indoor personnel is remarkably improved, the heat preservation fault diagnosis of the air conditioning system, the air supply system and the enclosure structure can be carried out.

The invention discloses an unmanned vehicle, a transverse control method thereof and electronic equipment. The method comprises the following steps of acquiring a position sequence of preview points;determining a weighted expected circumferential curvature according to a position deviation expected circumferential curvature, a heading deviation expected circumferential curvature and a trajectorycurvature expected circumferential curvature of a vehicle relative to each of the N preview points; and determining a steering wheel rotation angle and an expected rotation angle speed according to the weighted expected circumferential curvature so as to control the rotation of a steering wheel and realize transverse control. The step of obtaining the position sequence of the preview points comprises the sub-steps that the number N of the preview points is determined according to a real-time vehicle speed of the vehicle and a curvature of a current expected track; determining a position sequence of N reference points according to the real-time vehicle speed, wherein the N reference points are located in the current driving direction of the vehicle; and determining a point closest to each reference point in the N reference points on the current expected track as a transverse control preview point. According to the method, the applicability of the preview points and the real-time controlprecision of transverse control are improved.

A system for generating a map for use in the navigation of one or more vessels includes: one or more sensor sub-systems provided on a vessel and configured for sensing, in real-time, the presence of obstacles within a local environment of the vessel; a processor associated with the one or more sensor sub-systems for collecting the sensor data and configured for generating therefrom, in a serialised digital format, a real-time map of the local environment surrounding the vessel; data communication means between the processor and a remotely located hub in data communication with remote sensing systems located remotely from the vessel. The hub is configured to collect sensor data from a source remote from the vessel and communicate the sensor data to the processor. The processor is configured on receipt of additional sensor data to generate a real-time map from the sensor data.

The invention discloses an unmanned vehicle, a terminal point lateral steady-state control method thereof and electronic equipment. The method comprises the following step that a position sequence containing N preview points is acquired; the number N of preview points is determined according to the real-time vehicle speed of the unmanned vehicle and the curvature of a current expected track; then,a position sequence of N reference points is determined according to the real-time vehicle speed, and the N reference points are located in the current driving direction of the unmanned vehicle; within a preset distance close to the terminal point of the current expected track of the unmanned vehicle, a point closest to each reference point in the first R reference points on the current expectedtrack is determined as the first R preview point for lateral control, the remaining K reference points do not have the preview points on the current expected track, and missing K preview points are continuously supplemented after the terminal point of the current expected track to obtain the position sequence containing the N preview points, wherein R is greater than or equal to 0 and less than N,K is greater than or equal to 1 and less than or equal to N, and R + K is equal to N. The stability of lateral control of the vehicle at the terminal point is ensured.

The embodiment of the invention discloses an unmanned aerial vehicle inspection system and inspection method. The unmanned aerial vehicle inspection system comprises an unmanned aerial vehicle, a control unit, a first vehicle-mounted platform and a second vehicle-mounted platform. The control unit is in communication connection with the unmanned aerial vehicle and is used for controlling the unmanned aerial vehicle to work according to an inspection task and receiving an image signal acquired by the unmanned aerial vehicle. The first vehicle-mounted platform is provided with a control unit, and the first vehicle-mounted platform is movable and provides a first platform for lifting the unmanned aerial vehicle for the unmanned aerial vehicle. The second vehicle-mounted platform is provided with a control unit, and the second vehicle-mounted platform is movable and provides a second platform for lifting the unmanned aerial vehicle for the unmanned aerial vehicle; wherein the unmanned aerial vehicle can take off from the first vehicle-mounted platform or the second vehicle-mounted platform and can land on the first vehicle-mounted platform or the second vehicle-mounted platform. According to unmanned aerial vehicle inspection system and inspection method provided by embodiment of invention, high real-time precision of the unmanned aerial vehicle in the inspection process can be realized, and meanwhile, manual intervention is not needed for rising and falling of the unmanned aerial vehicle, so that inspection efficiency is improved.

The invention belongs to the technical field of communication, and particularly relates to an algorithm, system and device for eliminating unmanned aerial vehicle positioning NLOS, and a storage medium. The algorithm comprises the following steps: obtaining an initial position of an unmanned aerial vehicle, flight information and a measured value; identifying a value having a non-line of sight error in the measured value according to the initial position of the unmanned aerial vehicle and the flight information; and eliminating the non-line of sight error according to the measured value havingthe non-line of sight error to obtain an actual position. According to the algorithm provided by the embodiment of the invention, by obtaining the measured value having the non-line of sight error and eliminating the measured value having the non-line of sight error at first, the measured value can be processed more accurately, so that the positioning result is more accurate, and the method for eliminating the non-line of sight error used in the invention can greatly shorten the positioning time.

The invention provides a method for changing a steam feed pump system into a full-variable-frequency electric feed pump system and a brand-new logic control system of the full-variable-frequency electric feed pump system. The steam feed pump system comprises a small steam turbine, a steam feed pump control system DEH, a feed pump, a booster pump motor and a booster pump, and the feed pump, the booster pump motor and the booster pump jointly serve as part of a rotating hardware structure of the refitted full-variable-frequency electric feed pump system. The method comprises the following stepsthat the small steam turbine and the steam feed pump control system DEH in the steam feed pump system are dismantled; and a driving motor and a step-up gear box which are connected with each other areinstalled at the position of an original small steam turbine, the step-up gear box is in mechanical transmission connection with the feed pump, and the driving motor is connected to a signal and electric power output device in the refitted brand-new logic control system through a high-voltage frequency converter. The changed brand-new system is controlled and driven by using brand-new computational logic and a control method, and a traditional method of calculating and controlling with the water level of a steam drum is abandoned.

The embodiment of the invention discloses a course angle determination method and system, an electronic device and a storage medium. The method comprises the following steps: acquiring longitude and latitude data at the current moment through one path of signal, and determining current coordinate data based on the Mercator coordinate transformation model and the longitude and latitude data, obtaining a historical coordinate data set corresponding to the historical moment set, determining a first course angle and a second course angle according to the current coordinate data and the historicalcoordinate data set, and determining a target course angle according to the first course angle and the second course angle. Based on the embodiment, longitude and latitude data of the carrier at the current moment are obtained through one path of signal transmitted to the satellite receiver by one satellite antenna, the target course angle is determined by combining the historical coordinate dataset corresponding to the historical moment set, so that the course angle error caused by slight jitter when the carrier performs linear motion can be reduced, the real-time precision of the course angle is improved, and the problem of introducing an installation angle error can be avoided.

The invention discloses a settlement monitoring street lamp based on a Beidou navigation system. The settlement monitoring street lamp comprises a base disc, a settlement observing buoy and a Beidou positioning device. The settlement observing buoy is fixedly installed above the base disc, the Beidou positioning device is fixedly installed above the settlement observing buoy and comprises a Beidou antenna, and the Beidou antenna undergoes forced centering to the settlement observing buoy. According to the settlement monitoring street lamp, by arranging the settlement observing buoy on the street lamp base disc and causing the Beidou antenna of the Beidou positioning device to undergo forced centering to the settlement observing buoy, monitoring precision is not affected by the environment, and the monitoring cost is reduced.

The invention discloses a device for automatically adjusting the pressure of flowing gas, comprising a vacuum gauge and a valve body. The device is characterized in that the valve body is a fine-adjustment valve body the air inlet end of which is provided with an air inlet joint and a fine-adjustment air inlet valve, the gas transmission end is provided with a vacuum detection head, a piezoelectric ceramic valve is arranged between the fine-adjustment air inlet valve and the vacuum detection head, the signal output end of the vacuum detection head is connected with the input end of the vacuum gauge through a first wire, the output end of the vacuum gauge is connected with the input end of a piezoelectric controller through a data wire, a digital / analogue converter and a second wire, the output end of the piezoelectric controller is connected with the control end of the piezoelectric ceramic valve through a third wire and a sealed conductive plate on the fine-adjustment valve body, and the gas transmission end of the fine-adjustment valve body is provided with a threaded joint to facilitate sealing connection with a container into which the flowing gas is to be input. The device has simple structure, easy operation and great practical value under the experimental condition that the air pressure is lower than 100torr and the stability thereof needs to be accurately controlled.

The invention provides a method for changing a steam feed pump system into a full-variable-frequency high-rotating-speed electrically-driven feed pump system and a brand-new logic control system of the full-variable-frequency high-rotating-speed electrically-driven feed pump system. The steam feed pump system comprises a small steam turbine, a steam feed pump control system DEH, a reduction gear box, a feed pump, a booster pump motor and a booster pump, wherein the reduction gear box, the feed pump, the booster pump motor and the booster pump jointly serve as part of a rotating hardware structure of the refitted full-variable-frequency high-rotating-speed electrically-driven feed pump system. The method comprises the following steps that the small steam turbine and the steam feed pump control system DEH in the steam feed pump control system are dismantled; and a high-rotating-speed motor is installed at the position of the original small steam turbine, the high-rotating-speed motor isin mechanical transmission connection with the feed pump, and the high-rotating-speed motor is connected to a refitted brand-new logic control system through a high-voltage frequency converter. The changed brand-new system is controlled and driven by using brand-new computational logic and a control method, and a traditional method for calculation and control by using the water level of a steam drum is abandoned

The invention belongs to the technical field of automobile intelligent driving assistance, and relates to a slope speed precise control method for a vehicle-mounted intelligent cruise system. The cruise vehicle speed regulation is responsible for cruise vehicle speed regulation by a cruise vehicle speed regulation control module, the cruise vehicle speed regulation control module collects input information, and after comprehensive decision judgment, cruise vehicle speed regulation related control information is output, so that cruise vehicle speed self-adaptive regulation control is realized; the input information means that four paths of information are input at the same time, and each path of input information representing one type of information is the current basic state of the vehicle, cruise setting information, current driving state information of the vehicle and sensor acquisition information; inputting the fifth path of information; the input 5 is'navigation map information input '; according to the invention, the accuracy of cruise speed control when the vehicle runs on a high-rise fluctuating slope is improved; and the comfort feeling of passengers in the vehicle is considered, so that the cruise vehicle speed control adjustment is highly consistent with the cruise vehicle speed set by a driver, and the driving feeling of the driver is greatly improved.

The invention relates to a surface self-cleaning system based on wind direction dust accumulating monitoring. An intelligent monitoring subsystem, an intelligent operation subsystem, a control subsystem, an intelligent ash avoiding subsystem and a composite power dust removal subsystem are included. The intelligent monitoring subsystem comprises a wind direction and wind speed monitoring module and an image recognition collecting module. The intelligent operation subsystem comprises an intelligent operation platform for processing output data. The control subsystem comprises a single-chip microcomputer module for receiving and processing signals and a serial communication module for communicating with an outer computer. The intelligent ash avoiding subsystem comprises a photovoltaic plate,a main shaft, a drive motor and a box, the photovoltaic plate is supported by the main shaft, the main shaft is driven by the drive motor, and the drive motor is arranged in the box. The composite power dust removal subsystem comprises ITO conductive glass and a standing wave alternating current electric field. By means of the surface self-cleaning system based on wind direction dust accumulatingmonitoring, automatic dust removal of the photovoltaic plate in the desert region is achieved, the power generation efficiency of the photovoltaic plate is greatly improved, and personal injuries caused by the extreme environment are reduced.

The invention discloses a settlement monitoring street lamp based on a Beidou navigation system. The settlement monitoring street lamp comprises a base disc, a settlement observing buoy and a Beidou positioning device. The settlement observing buoy is fixedly installed above the base disc, the Beidou positioning device is fixedly installed above the settlement observing buoy and comprises a Beidou antenna, and the Beidou antenna undergoes forced centering to the settlement observing buoy. According to the settlement monitoring street lamp, by arranging the settlement observing buoy on the street lamp base disc and causing the Beidou antenna of the Beidou positioning device to undergo forced centering to the settlement observing buoy, monitoring precision is not affected by the environment, and the monitoring cost is reduced.

The invention discloses a high-precision real-time attitude measurement device and method based on an antenna turret, and belongs to the technical field of real-time directional attitude measurement.The high-precision real-time attitude measurement device and method an inertial measurement unit, a double-shaft turntable and a test upper computer, wherein the double-shaft turntable simulates the use environment of the antenna turret, is electrically connected with the inertial measurement unit and drives the inertial measurement unit to rotate; and the test upper computer is electrically connected with the inertial measurement unit and is used for sending a control instruction and carrying out data acquisition and data processing at the same time. In order to meet the requirements of smallsize and real-time performance of attitude measurement at the same time, a pure strapdown inertial measurement unit without a built-in transposition mechanism is adopted, the size and weight of equipment can be effectively reduced by canceling the built-in transposition mechanism, and meanwhile, a flexible link of the transposition mechanism between an IMU and a base is removed, so that the real-time performance of attitude measurement of the inertial measurement unit can be improved; and in order not to reduce the alignment precision of the inertial measurement unit, the antenna turret is utilized to perform rotation modulation of two-position rotation and stop, so that a high-precision directional attitude measurement function is realized.

The invention discloses a vacuum pipeline speed measuring and positioning system and method. The system comprises a plurality of single-spectrum light sources with different wavebands, a vehicle-mounted image acquisition device that acquires spectral images of the plurality of single-spectrum light sources with different wavebands, and a control device that processes the image to obtain a tensor matrix of the image and locates the train according to the tensor matrix and light source data pre-stored in a light source database; the control device also judges whether the light source changes or not, if not, data in the light source database are updated with a tensor matrix, if so, the tensor matrix is converted into a column vector, the light source change distance is determined, whether light source tracking recognition succeeds or not is judged, and if so, the train speed is determined according to the light source change distance; and otherwise, whether the light source change distance is zero is determined, if so, data in the light source database are updated by using the column vector, otherwise, the data in the light source database are updated by using the column vector and the light source database is triggered to send the column vector, and the updated light source change distance is determined according to the sent column vector so as to determine the train speed.

The invention relates to a method for utilizing forwarding range finding value and pseudo range value to determine GEO navigation satellite clock error. The method comprises the following steps: obtaining GEO navigation satellite transponder time delay value, forwarding range finding value, pseudo range finding value and synchronization forwarding range finding value through laser measurement anddefinitive orbit calculation, converting the synchronization forwarding range finding value as original satellite ground distance value, and carrying out ionosphere correction on the original satellite ground distance value and the pseudo range finding value to respectively obtain ionosphere corrected satellite ground distance value and ionosphere corrected pseudo range measured value; figuring out real-time GEO navigation satellite clock error; and obtaining satellite transponder time-delayed actual value and after precise GEO navigation satellite clock error through after precision definitive orbit calculation. According to the method, clock error product with second time interval can be provided to improve real-time precision of a navigation positioning system. Also the calculating method used in the invention is simple, thus error in the calculating process is effectively minimized.

The invention provides a four-part harmony composition system, which comprises a data input module, a data processing module, a real-time display module, a data storage module and a software access module, and is characterized in that the output end of the data input module is connected with the input end of the data processing module, and the data input module is used for inputting sound part information, notes and music score files; the output end of the data processing module is connected with the input ends of the data storage module, the real-time display module and the software access module, the data processing module is used for processing and converting input data, and the output end of the data storage module is connected with the input end of the software access module; according to the four-part harmony composition system, note data or a music score file can be processed through the data input module and the data processing module, and the real-time accuracy of music score creation of a user is improved through intelligent matching, so that the accuracy and efficiency of note input are improved; and the system can be used for real-time interaction in music creation teaching to display a music effect.

The invention relates to a high-concurrency query method, an intelligent terminal and a storage medium. The method comprises the steps of receiving a query request of a client; in response to the received query request, accessing the first-level cache, and when query data corresponding to the query request exists in the first-level cache, sending the query data to the client; when the query data corresponding to the query request does not exist in the first-level cache, accessing a second-level cache; when the query data corresponding to the query request exists in the second-level cache, filtering the query data, and sending the filtered query data to the client for pre-display; and sending the filtered query data to a client, accessing supplier data, obtaining query data corresponding tothe query request in the supplier data, filtering the query data, sending the filtered query data to the client, and sending the filtered query data to the client, wherein the query data in the supplier data covers the query data in the second-level cache. The data can be conveniently, timely and accurately updated.