41results about How to "Realize real-time calibration" patented technology

The invention relates to a virtual restoration method for interactive broken relics. The method comprises the steps that (1) relic piece data acquisition and classification are carried out; (2) three-dimensional model interaction based on Wiimote is carried out; (3) complementary splicing and virtual restoration of relic pieces are carried out; (4) relic virtual restoration based on template matching is carried out; and (5) relic entity restoration based on three-dimensional printing is carried out. According to the invention, an MSME three shaft accelerometer, a gyroscope and an infrared induction strip are used to realize interaction control of relic models; real-time calibration is carried out on MSME displacement and attitude 6 freedom degree information; the limitation of poor interaction control accuracy caused by gravity acceleration and poor MEMS sensitivity is overcome; the relic piece virtual restoration problems of two conditions that semantic relevance exists while a complementary matching relationship is inconsistent, and a complementary relationship is consistent while strict edge matching cannot be realized are solved; and rapid relic entity restoration can be completed with a three-dimensional printer.

The invention provides a comprehensive real-time calibration method for a multi-channel digital anti-interference antenna system, which can effectively increase output signal to noise ratio of the system. The method is implemented by the following technical scheme and comprises the following steps: connecting an antenna array surface, channels and a signal processing plate between a power supply and a computer to form a self-calibration antenna system; transmitting a near-field signal and a far-field signal by using a transmitting antenna and a standard antenna at different time, calculating difference between amplitude and phase of two groups of signals output by a receiving channel and storing the difference value into FLASH; controlling the channels and the signal processing plate by using a computer through a serial port so as to be in a calibration state and performing system calibration by comparing the amplitude and the phase of the signal of each channel by a calibration algorithm stored in a field programmable gate array (FPGA); and providing analog inertial navigation information to the signal processing plate by using the computer through the serial port, automatically adjusting the main beam of the antenna according to the inertial navigation information by an anti-interference algorithm in the FPGA, and inhibiting the antenna to receive each external interference signal. According to the method, high efficiency and sustainability of system operation are guaranteed.

The invention relates to the field of calibration methods of measuring equipment, aims at solving the technique problem and overcoming the disadvantage that existing water content calibrating methods are not applicable in the processing technic of cigarette grouping, and provides a method that can quickly and accurately calibrate water content gauges in the working process. The improved calibration method of the invention adds a Beta variable, and consequently builds the connection between mutually independent calibration curves, can finish the revision of all curves in daily dynamic calibration only by adjusting the Beta variable, greatly lowers the sample amount in the sampling, raises calibration efficiency and precision and realizes the real-time calibration of linear water content gauges in the processing technic of grouping.

The invention discloses a dynamic balancing machine standard correction rotor with an internal conical surface. The dynamic balancing machine standard correction rotor comprises a central spindle, wherein the central spindle comprises a left supporting section supported on a balancing machine bearing bracket, an interference fit section in interference fit with a central hole in a left end cover, a limiting section for performing axial limiting, a clearance fit section in clearance fit with a central hole in a right end cover, a threaded section matched with a locking nut and a right supporting section from the left to the right, wherein assembling rings are formed on the opposite end surfaces of the left end cover and the right end cover; the inner ring of each assembling ring is a conical surface; and multiple threaded holes matched with a test mass are formed in the radial direction of the assembling rings. According to the left end cover and right end cover with internal conical surfaces as well as the threaded holes in the assembling rings, real-time correction of a dynamic balancing machine is realized, and due to a chamber structure of the internal conical surface, a composite material cylinder can be subjected to line contact positioning, so that a measuring error introduced by the processing quality of the cylindrical end surface can be effectively avoided, and the system measuring error brought by the initial unbalance quantity of a positioning tool is reduced to the greatest degree.

The invention discloses a structured light plane calibration method and system in a railway foreign matter detection scene. The method comprises the following steps: establishing a world coordinate system XYZ by taking a steel rail top plane as Z = 0; obtaining a camera calibration equation of a camera in structured light projection, an intersection point P1 of projection rays of a line laser projector and a steel rail top plane Z = 0, an intersection point P2 of projection rays of the line laser projector and the bottom of the steel rail and the height H of the steel rail; substituting the intersection point P1 and Z = 0 into a camera calibration equation, and calculating world coordinates of the intersection point P1 in a world coordinate system XYZ; substituting the intersection point P2 and Z =-H into a camera calibration equation, and calculating world coordinates of the intersection point P2 in a world coordinate system XYZ; and calculating the world coordinates of the intersection point P3 of the projection ray of the linear laser projector on the other steel rail and the steel rail top plane Z = 0 and the intersection point P4 of the projection ray of the linear laser projector and the steel rail bottom by adopting the steps, and constructing a light plane according to P1, P2, P3 and P4.

The invention relates to the technical field of analog integrated circuits, more particularly to a design method for calibration circuits for pipeline ADCs. The method is performed through the following steps: building a behavior level model for a pipeline ADC and establishing a quantification relation between the design parameters of an ADC analog circuit and the design parameters of a digital calibration circuit on one hand and the ADC performances on the other hand; obtaining the design parameters of both the analog circuit and the digital calibration circuit, with which least power will be consumed from the ADC; designing circuits according to the obtained parameters; obtaining calibration coefficients by a calibration algorithm and referring to a DAC; and writing the calibration coefficients into the calibration circuits. With the method provided by the invention, a calibration circuit can be simplified a lot. In addition to that, as all work is done on a chip, less power and space are required. Compared to a back-ground calibration circuit on a traditional chip, up to 50% of power and space are saved. A calibration circuit requires an increase in size and power consumption only of the ADC core by 10% and 5% respectively with no increase in the size and power consumption of the chip. Further, the calibration system can be adapted for different working environments.

The invention relates to the technical field of video transcoding, and provides a timestamp calibration method and system for live streaming. The method comprises the following steps: building a livetranscoding task, conducting selecting to use a timestamp calibration function, and setting calibration parameters; after a transcoding service background receives the live broadcast transcoding task,starting a calibration task while starting a transcoding process, and determining frames needing to be calibrated in the live broadcast stream according to a timestamp insertion frequency; and selecting any one from start UTC time, the UTC time of the current frame and real-time Beijing UTC time to perform timestamp calibration on the frame needing to be calibrated according to the information about whether the source flow UTC is reserved or not. Thus, the problems that in the real-time video live broadcast process, a timeliness requirement is high, and frame-level positioning and processingcannot be conducted with the help of tools are solved. The problem that frame level calibration and unified calibration are difficult to carry out on live streams of different manufacturers is also solved.

The invention provides a system and method for eliminating the residual magnetic interference of a micro-satellite. The residual magnetism of a micro-satellite platform is modeled as a magnetic dipole, vector magnetometer probes are separately arranged at the tail ends of two symmetrical extending rods on the satellite surface, the internal relation between magnetic field gradient integral and magnetic field values is used for estimating the residual magnetic interference of the satellite platform, and geomagnetic field values at the position of a satellite body is given. The system and methodfor eliminating the residual magnetic interference of the micro-satellite use the method of the magnetic field gradient integral to present a satellite platform residual magnetism estimation method,and the purposes that the satellite platform residual magnetic interference can be eliminated and the accuracy of spatial geomagnetic field measurement is improved are achieved.

The invention discloses a real-time air quality data calibration method of utilizing error transfer. The method is characterized by: firstly, initializing a model, then collecting national-standard data and eazytec equipment data of a recent time period, and carrying out Kriging interpolation on the collected national-standard data to obtain national-standard interpolation data of which sampling frequency is equal to that of eazytec equipment; carrying out Bagging model-based modeling on the national-standard interpolation data and the eazytec equipment data; then carrying out data calibrationon a result, which is currently output by a Bagging model, on the basis of an error of the last model to obtain a calibration value; and finally, waiting for collection of latest national-standard data, updating the calibration error according to the newly collected national-standard data, and transferring the error to a next model. Through carrying out model verification on actually measured Yixing data, it is proved that the method is capable of effectively improving precision and accuracy of low-precision equipment, carrying out region deployment, and being applied to an actual productionenvironment.

The invention relates to an external parameter calibration method, device and equipment for a vehicle-mounted camera and a storage medium, and the method comprises the steps: determining a target mapping image according to a current frame image and a previous frame image, and determining a target mapping image according to a plurality of first pixel points in the previous frame image and a plurality of second pixel points in the current frame image included in the target mapping image; determining a plurality of target straight lines, wherein a first pixel point and a second pixel point in each target straight line correspond to the same feature point; determining a target vanishing point from all pixel points in the target mapping image according to the plurality of target straight lines; acquiring internal parameter data and external parameter initial data of the vehicle-mounted camera; and determining external parameter calibration data of the vehicle-mounted camera according to the target vanishing point, the internal parameter data and the external parameter initial data. According to the method, the target vanishing point can be determined based on the pixel points in the two adjacent frames, real-time calibration of the vehicle-mounted camera can be realized when the vehicle runs on a lane-line-free road, and the target distance measurement stability in the vehicle running process is improved.

The invention relates to a carrier navigation attitude measurement method based on geomagnetic information updating. The method comprises: carrying out initialization; calculating a magnetic declination angle; acquiring data at a next time; measuring navigation attitude information at a next time; updating magnetic declination angle information, and performing the measurement method continuously.According to the invention, data are measured based on an accelerometer, a gyroscope and a magnetic sensor; and on the basis of a discretized Kalman filter algorithm, the magnetic declination angle information is estimated and updated in real time. Therefore, a problem that the course angle information distorts and thus is not reliable due to the magnetic declination angle change caused by ferromagnetic materials like magnetic minerals, reinforcing steel bars and the like is solved.

The embodiment of the invention discloses a carrier deviation processing method. The method comprises the following steps: sending a first UWB data packet to a second terminal at a first UWB carrier frequency through a first UWB module of a first terminal; the first UWB data packet carries a standard target value, and the standard target value is used for adjusting the actual UWB carrier frequency of a second UWB module of the second terminal to obtain the currently adjusted UWB carrier frequency; receiving a second UWB data packet sent by a second terminal through a second UWB module at the current adjusted UWB carrier frequency through the first UWB module; obtaining a first carrier deviation estimation value between the currently adjusted UWB carrier frequency and the first UWB carrier frequency; and if a first incidence relation exists between the first carrier deviation estimation value and the standard target value, it is determined that carrier deviation calibration for the second UWB module is completed. The embodiment of the invention further discloses a terminal and a storage medium.

The invention relates to a limit calibration gauge and a limit calibration method which can realize rapid real-time calibration of special measuring tools on site. In the evaluation of the calibration method of the special measuring tool, the present invention realizes the simple and rapid calibration of the special measuring tool production site, shortens the calibration period, and saves the cost of sending out the calibration. In terms of product quality control, the limit calibration method realizes the real-time calibration of special measuring tools, effectively avoids the quality problem of product misjudgment caused by the inaccuracy of special measuring tools, and effectively controls the manufacturing quality of nuclear power fuel elements. (In terms of verification results, through the measurement uncertainty evaluation and calibration capability analysis of the "limit calibration gauge" and "limit calibration method", the calibration capabilities of the limit calibration gauge and the limit calibration method fully meet the requirements of national defense measurement value transfer, On-site real-time calibration can be realized.

The invention discloses an industrial control touch screen real-time calibration method, device and equipment based on touch pressure. The method comprises the following steps: acquiring a touch pressure value of the industrial control touch screen in a working mode; determining that the current touch operation conforms to a preset operation according to the touch pressure value; and controlling the industrial control touch screen to be switched from a working mode to a touch calibration mode. By obtaining the touch pressure value in the working mode, the industrial control touch screen is quickly triggered to be switched from the working mode to the touch calibration mode, real-time calibration of the industrial control touch screen in the working mode is achieved, assistance of externaltools is not needed, operation is easy and convenient, and user experience is improved.