40results about How to "Eliminate delay errors" patented technology

The invention discloses a method and a device for synchronizing a master clock and a slave clock, the method comprises: sending synchronous request message to the master clock for many times in a simultaneous cycle by the slave clock, recording the corresponding the time value, then, utilizing a median average filtering algorithm to obtain the optimum time migration amount, utilizing the time migration amount to adjust the slave clock, eliminating the delay inequality which is caused by stochastic disturbance and burst interference of a network communication channel between the master clock and the slave clock, guaranteeing the stability of slave clock signals, and increasing the synchronous preciseness of the master clock and the slave clock.

The invention discloses a method for synchronizing the time of a wireless sensor network and belongs to the technical field of the wireless sensor network. The method comprises the following steps that: 1) a central node broadcasts synchronization information to a network at a specific time interval and starts a synchronization process; 2) after receiving the synchronization information, a sensornode synchronizes time with a source node of the synchronization information and broadcasts the synchronization information thereof to the network when a channel is free; and 3) after each synchronization process is completed, the sensor node predicts the working frequency of a crystal oscillator configured per se in the current period by a winters method and corrects the logic time thereof according to the prediction result till the start of the next synchronization process. Compared with the prior art, the method can greatly prolong the time interval of period synchronization and reduce synchronization expense and the occupying of a wireless channel and improve the synchronization precision among nodes.

The invention discloses a method for acquiring a road network matching track of a mobile object, and belongs to the fields of spatiotemporal databases and intelligent transportation systems. The method comprises that: a) the mobile object acquires mv sequences and sends the mv sequences to a server in batches, wherein mv refers to a mobile vector; b) the server performs road network matching on each mv in the mv sequences to obtain nmv sequences, wherein the nmv refers to the road network matched mobile vector; and c) the server performs path matching on each nmv in the nmv sequences to obtain and store the road network matching track. The method can be used for the intelligent transportation systems.

The invention discloses a method for realizing the average clock synchronization of a wireless sensor network through cluster averaging, which comprises the following steps of: (1) dividing the wireless sensor network into a plurality of interlinked intersectant clusters; (2) broadcasting a synchronous signaling to a physical channel at one time by using a transmitter, and respectively recording the local signaling-received time of each inter-cluster node by the inter-cluster nodes; (3) sequentially sending the recorded local times to other nodes by the inter-cluster node until the last node receives the local times, calculating the average value of all the local times, and sequentially sending the average value to other nodes, so that all nodes adjust the phases of the local clocks thereof according to the average value so as to update the local clock of each inter-cluster node to the average value, thereby realizing the local synchronization of the inter-cluster nodes; and (4) repeating the steps (2) and (3) until a synchronization error reaches a threshold, then stopping circulating, thereby realizing the integral clock synchronization of the whole network. By using the method disclosed by the invention, the energy consumption is reduced, and the time synchronization accuracy and the network expandability are improved, therefore, the method can be applied to large-scale network clock synchronization.

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.

Embodiments of the present invention provide a touch point identification method and apparatus, and a display device, which relate to the technical field of electronics, and can reduce or eliminate delay errors to reduce the phenomena of touch point loss and line breakage. The method comprises: driving an optical path emitting structure on a touch screen in a horizontal edge direction and a vertical edge direction to complete a scanning period, wherein a plurality of scanning angles are formed in the vertical edge direction, and a plurality of scanning angles are formed in the horizontal edge direction; determining one direction with most touch areas, detected in the horizontal edge direction or the vertical edge direction as a benchmark direction, and the other direction as a reference direction; acquiring M intersections Mi of the touch areas in m scanning directions of the benchmark direction, and acquiring N intersections Nj of the touch areas in n scanning directions of the reference direction, wherein each scanning angle corresponds to a scanning direction, i is more than 0 and less than or equal to M, and j is more than 0 and less than or equal to N; and determining touch points according to the intersections W1 of Mi and Nj. The method and the apparatus provided by the embodiments of the present invention are used for touch point identification.

The invention discloses a dual-mode satellite fusion positioning method suitable for a ship traffic management system. Dual-mode fusion of Beidou and GPS is performed to realize accurate, real-time and reliable positioning of a ship. The method mainly comprises the following steps: firstly, a satellite dual-frequency pseudo-range error correction model is established; then, spatial position coordinates of a Beidou satellite and a GPS satellite are respectively calculated according to the ephemeris data, and dual-system time-space conversion and unification are carried out; then, Beidou and GPSdual-mode pseudo-range positioning calculation is carried out, and the ship position is preliminarily solved; the elevation angle of each satellite relative to the ship is calculated; then a multi-weight model is established according to factors such as a system category, a signal-to-noise ratio and an elevation angle of the satellite; and finally, positioning calculation is carried out on the ship again based on the multi-weight model, and the spatial position coordinates of the ship at the moment t of the current observation epoch are finally determined. The method is higher in positioningprecision, lower in algorithm complexity and higher in system safety.

The invention discloses a heat source temperature measurement device for electrical heating. The device comprises a load voltage sampling module, a load current sampling module, a zero crossing trigger synchronous module and a microprocessor, the microprocessor records the current signal sent by the load current sampling module and the voltage signal sent by the load voltage sampling module after receiving the zero crossing synchronization signal of the zero crossing trigger synchronous module, the resistance value of a heat source can be calculated as per a formula of R=V/I, and the heat source temperature value can be obtained per the relation curve of the resistance value and the temperature value of heat source material. The invention has the benefits that by virtue of the property that the internal resistance of the heat source can be changed along with the temperature variation during heating process, the heat source temperature can be measured indirectly by measuring the variation of the internal resistance, in this way, the voltage and the current, which pass the heat source, can be measured real-timely during the heating process, and the resistance value of the heat source can be calculated as per the formula of R=V/I, thereby determining the temperature of the heat source for electrical heating accurately.

The invention discloses a synchronization method of an optical fiber distribution device for a power cable. The method comprises the steps that an upper computer transmits an acquisition start command to a control unit; the control unit records the current time after receiving the acquisition start command transmitted by the upper computer, transmits triggering signals to acquisition units, and receives signals returned by the acquisition units; the acquisition units trigger via the triggering signals to acquire signals detected by sensors, and transmit the acquired signals to the control unit; the acquisition units acquire for the preset time or the preset data length, stop acquisition, store acquired data or transmit the acquired data to the upper computer via an optical fiber; and the upper computer receives the data returned by the control unit and the acquisition units, computes time delay between the control unit and each acquisition unit respectively, performs time correction on the data acquired by the acquisition units, deletes the data before the synchronization time, and reserves, displays and stores the synchronization acquisition data of the acquisition units.

The invention is applicable to the field of laser ranging, and discloses a laser ranging system. The system includes a logic control module, a signal conversion module, an optical module, a laser transmitting module and an echo detection module. The logic control module sends a control signal to the laser transmitting module. The laser transmitting module generates a driving signal according to the control signal, sends the driving signal as a reference signal to the signal conversion module and transmits a pulse laser. The pulse laser is transmitted to a target object through the optical module and generates a laser echo. The laser echo is transmitted to the echo detection module through the optical module. The echo detection module converts the laser echo into an echo electrical signal and sends the echo electrical signal to the signal conversion module. The signal conversion module performs analog-to-digital conversion on the echo electrical signal and the reference signal and sends the signals to the logic control module. The logic control module obtains ranging distance according to the converted reference signal and the converted echo electrical signal. The laser ranging system can eliminate a time-delay error and improve the accuracy of laser ranging.

The invention discloses a device and method for detecting anchor rope grouting compactness in a pre-embedding manner. According to the device and method, multiple accelerated speed sensors and an electric spark source are pre-embedded in an anchor rope construction period; system delay errors are eliminated by utilizing time differences received by the multiple sensors; and by adoption of a stresswave direct wave method and reflected wave method combined method, wave speeds of grouted concrete at anchor rope anchorage segments can be reflected more truly and accurately.

The invention discloses a carrier phase integer ambiguity measurement method for unmanned driving positioning and attitude measurement. The method comprises the following steps: constructing a calculation formula of wide lane ambiguity, judging whether cycle slip occurs or not, judging the influence of a cycle slip value on a calculation value, performing smooth calculation by utilizing a phase observation value, obtaining epoch cycle slip according to a TECR value, and calculating the cycle slip of an original carrier phase observation value. According to the invention, an MW combination method is adopted to eliminate atmospheric ionosphere and troposphere delay errors, station star geometric distance, satellite and receiver clock error. The method has long wavelength and high suitabilityfor solving the cycle slip problem in the dynamic environment. The ionosphere change rate is calculated by adopting the continuous phase observation value without cycle slip to detect the cycle slipand eliminate the influence of the geometric distance of the station satellite, the ionosphere change influence is considered, and the method is suitable for cycle slip detection in the dynamic environment, so that the resolution of the whole cycle ambiguity is facilitated.

The invention discloses a method and device for realizing a one-step mode of a precise time protocol message, and a storage medium; the method comprises the steps: recording the message time; then identifying the PTP message, judging whether the PTP message is a one-step message or not, if the PTP message is the one-step message in the receiving direction, storing an arrival timestamp, and storing the arrival timestamp of the message in a register in a PHY; then in the transmitting direction, reading the arrival timestamp of the message and calculating the residence time by using the departure timestamp and the arrival timestamp, and then modifying the correction domain field of the PTP message by using the residence time. According to the invention, the PHY records the entering and departure time of the message at the MDI, and the correction domain of the PTP message is modified while forwarding; therefore, the one-step mode processing of the PTP message on the TC is realized, and the time delay error on the PHY is eliminated; besides, the upper layer module does not need to participate in processing of the PTP message forwarded by the local TC, so that the implementation difficulty of the TC is simplified. Meanwhile, extra network bandwidth occupation in a two-step mode is avoided, and the development and maintenance cost of the product is also reduced.

The invention relates to a multi-material 3D printing method and a micro-flow extrusion type printer based on the multi-material 3D printing method. The method comprises the following steps that 1, an stl format file of a to-be-printed object is read, the stl format file is processed and sliced, path planning is conducted on a printing nozzle, path information is obtained, a moving step length is set, and material information is added to points on the path; 2, the printer reads the material information, the printing nozzle does idle stroke motion in the period when a blank runner is filled with a mixture, the printing nozzle is located at the starting point of the path when the idle stroke motion is finished, the printer continues to read the material information and starts to read the path information, and a printing task is started; and 3, after the material information is read, the printer does not read the material information any more and continues to read the path information until the mixture in a charging barrel is completely extruded out, and the printing nozzle completes the whole printing task. The method can eliminate the delay error generated in the process of filling the blank runner with the mixture, and the printer is suitable for a ceramic functionally graded material.

The invention discloses an image data processing method, apparatus and system. The method comprises the following steps: a first processing device receives first image data transmitted by a first transmission channel and second image data transmitted by a second transmission channel, wherein the first image data are initial image data output by the first processing device or a second processing device, and the second image data are image data obtained by processing encoding and decoding processing on the initial image data; the first processing device obtains a first transmission time of the first image data in the first transmission channel, and a second transmission time of the second image data in the second transmission channel; and the first processing device obtains the transmission time of the second transmission channel according to the first transmission time and the second transmission time. By adoption of the image data processing method, apparatus and system, the technical problem that the transmission delay obtained by the image processing method in the prior art contains a system delay error is solved.

The invention discloses an animal wound hemostasis model. The animal wound hemostasis model is constructed by using a beagle. The animal wound hemostasis model is constructed by the following steps: S1, weighing and grouping; S2, forming a wound surface; S3, grouping according to a hemostasis mode; and S4, counting the time required for blood flow stopping and the time required for wound recovery,and constructing an animal model. The animal wound hemostasis model has the beneficial effects that the cross wound surface is formed, so that the accuracy of the animal model is reflected; the length, the depth and the width of the wound surface are limited, so that the application range of the model is expanded; through different hemostasis means, the animal wound hemostasis model with different sizes of wound surfaces correspondingly taking different hemostasis measures is constructed; by using an inhibition hemostasis group of an anticoagulant, through cross comparison, the accuracy of constructing the model is reflected, and meanwhile, a delay error is eliminated; and ventilation is carried out in time by using a ventilation pipe, so that dyspnea is avoided, and the consistency of experimental animals is ensured.