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

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 provides a high temperature calibration device for testing microwave dielectric material and calibration method thereof. The device comprises a vector network analyzer, two sets of waveguides which are respectively connected with the vector network analyzer; each set of waveguide comprises a coaxial line to waveguide adapter, a cooling waveguide, a high reflection and straight converting waveguide, a thermal insulation waveguide, a high temperature waveguide, and a short-circuit board which are sequentially connected; the short circuit is formed by opening a seam in the high reflection and straight converting waveguide and inserting a high reflection insertion piece therein; the calibration method comprises the following steps: starting a test software; controlling the insertion of the high reflection insertion piece at the seam of the waveguide; running the test software for automatic calibration; testing reflection factors S11r blank and S22r blank in two high temperature waveguides at a normal temperature; testing S11h and S22h blank at a high temperature after a to-be-tested dielectric sample is loaded in, and correcting S11h; calculating a complex dielectric constant at temperature T of the to-be-tested dielectric sample by using S'11 which is corrected with microwave loss. The device and method can be applied to a high temperature test system of microwave material dielectric performance, and can further increase the test precision of the test system.

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 real-time calibration method for frequency-modulated continuous wave linearity in terahertz imaging and a system thereof. The method comprises the following steps: mixing anecho signal reflected by a target to be measured with a terahertz signal to obtain a baseband signal; dividing the baseband signal into two paths for calibrating calculation, wherein one path filtersa coupling signal through band-pass filtering to obtain a baseband signal carrying target information, and the other path is used as real-time calibration data to calibrate each pulse in real time inthe calibrating calculation, filter random phase noise before the calibrating calculation and transform the acquired data into complex data. The invention can not only calibrate each pulse in real time to guarantee the timeliness of the calibration data and target echo data and realize the real-time calibration, but also filter out the coupled signal to ensure the sensitivity of the system. The invention has a good effect in terahertz imaging measurement with large random phase noise and high measurement accuracy requirements.

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.

Disclosed in the invention is an external-conical-surface-contained standard calibration rotor for a dynamic balancing machine. The calibration rotor comprises a mandrel including a left support segment, an interference fit segment, a limiting segment, a clearance fit segment, a thread segment, and a right support segment from left to right; the left support segment is supported at a balancing machine bearing rack; the interference fit segment is in an interference fit relation with a center of a left end cover; the limiting segment is in an axial limiting mode; the clearance fit segment is in a clearance fit relation with a center of a right end cover; and the thread segment cooperates with a locking nut. Assembling rings are formed on opposite end surfaces of the left end cover and the right end cover; and limiting plates are formed on the outer walls. The outer rings of the assembling rings are conical surfaces; and a plurality of threaded holes cooperating with a test mass unit are formed in the assembling rings in the radial direction. According to the invention, with the left end cover having the external conical surface and the right end cover having the external conical surface as well as threaded holes arranged on the assembling rings, real-time calibration of the dynamic balancing machine is realized; and with the external conical surfaces and the limiting plates, line-contact positioning is carried out on a composite-material-based cylinder, thereby minimizing a system measurement error caused by the initial unbalancing value of the positioning tool itself.

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 invention discloses an SHA-less pipeline ADC sampling time error calibration system, and belongs to the field of analog-to-digital conversion. The system comprises a clock generation module, N pipeline level modules, a digital code dislocation addition module and an error calibration module, wherein the error calibration module comprises an error detection unit and a delay line calibration unit. The invention also provides a corresponding calibration method, the error detection unit detects the residual error output result of the first pipeline stage and generates a control signal to control the delay of the delay line calibration unit, so as to adjust the sampling time of the sub-ADC. And through multiple iterations, the sampling time of the sub-ADC is aligned with the sampling time of the MDAC, and calibration is completed. Once the sampling time deviates due to the change of the external environment, the calibration module is activated again immediately. The calibration method provided by the invention is high in calibration precision, and can have higher calibration precision and shorter calibration time for high-frequency analog signals.

The invention discloses a method for real-time calibration of air quality data using error transmission, which is characterized in that: firstly, the model is initialized, and then national standard data and Zhuoyi equipment data of the latest time period are collected, and kriging interpolation is performed on the collected national standard data , to obtain the national standard interpolation data whose sampling frequency is equal to that of Zhuoyi equipment; secondly, to model the national standard interpolation data and Zhuoyi equipment data based on the Bagging model; Perform data calibration to obtain the calibration value; finally wait for the collection of the latest national standard data, and update the calibration error based on the newly collected national standard data, and pass the error to the next model. This method performs model verification on the measured data in Yixing. This method can effectively improve the precision and accuracy of low-precision equipment, and can be deployed regionally and applied to the actual production environment.

The invention relates to the field of heavy-water reactor fuel element bent pipe gauge calibration, and specifically discloses a heavy-water reactor fuel element bent pipe gauge calibration gauge and a field calibration method. The calibration gauge is characterized in that the calibration gauge comprises a diameter calibration gauge and a bending calibration gauge; the diameter calibration gauge includes a square bar and rectangular solids arranged at the two ends of the square bar; and the bending calibration gauge includes a reference gauge, a spherical gauge, and a wedge block gauge fixedly arranged between the reference gauge and the spherical gauge. The upper limit of diameter, the lower limit of diameter and the bending of a heavy-water reactor fuel element bent pipe gauge can be calibrated using the diameter calibration gauge and the bending calibration gauge. The quality problem of product misjudgment due to misalignment of a heavy-water reactor fuel element bent pipe gauge is avoided effectively. The manufacturing quality of nuclear power fuel elements is controlled effectively.

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 provides a high-temperature calibration device for microwave dielectric material testing and a calibration method thereof. The device includes: a vector network analyzer, and two sets of waveguides respectively connected to the vector network analyzer. Joints, cooling waveguides, high-reflection and straight-through conversion waveguides, heat-insulated waveguides, high-temperature waveguides, short-circuit boards, high-reflection and straight-through conversion waveguides are slotted into high-reflection inserts to form a short circuit; the calibration method includes opening the test software and opening a slot in the waveguide Control the insertion of the high-reflection insert, run the test software for automatic calibration, test the reflection coefficients S11r and S22r in the two high-temperature waveguides at room temperature, test the S11h and S22h after loading the medium sample to be tested at high temperature, and test the S11h Carry out correction; Utilize S ' 11 after microwave loss correction, calculate the complex dielectric constant of the medium sample to be tested at temperature T; This device and method can be applied in the microwave material dielectric property high-temperature test system, can further improve The test accuracy of the test system.

Disclosed in the invention is an external-conical-surface-contained standard calibration rotor for a dynamic balancing machine. The calibration rotor comprises a mandrel including a left support segment, an interference fit segment, a limiting segment, a clearance fit segment, a thread segment, and a right support segment from left to right; the left support segment is supported at a balancing machine bearing rack; the interference fit segment is in an interference fit relation with a center of a left end cover; the limiting segment is in an axial limiting mode; the clearance fit segment is in a clearance fit relation with a center of a right end cover; and the thread segment cooperates with a locking nut. Assembling rings are formed on opposite end surfaces of the left end cover and the right end cover; and limiting plates are formed on the outer walls. The outer rings of the assembling rings are conical surfaces; and a plurality of threaded holes cooperating with a test mass unit are formed in the assembling rings in the radial direction. According to the invention, with the left end cover having the external conical surface and the right end cover having the external conical surface as well as threaded holes arranged on the assembling rings, real-time calibration of the dynamic balancing machine is realized; and with the external conical surfaces and the limiting plates, line-contact positioning is carried out on a composite-material-based cylinder, thereby minimizing a system measurement error caused by the initial unbalancing value of the positioning tool itself.

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 a satellite-born multi-beam antenna emission channel calibration system with no service interrupted, and belongs to the technical field of radar antenna measurement. Accordingto the invention, the system overlaps an ultra-low power calibration signal and a normal communication service signal, processes the signal through an upconverter and a power amplifier and the like modules, and radiates the signal through an emitting antenna array, a receiving end extracts the amplitude phase error coefficients of respective emitting channels through a parallel correlator, obtainsan amplitude calibration factor and a phase calibration factor that have higher precision, an adjustment apparatus adjusts the amplitudes and the phases of the respective emitting channels based on the amplitude calibration factor and the phase calibration factor, thus calibrating the satellite-born multi-beam antenna emitting channel with no service interrupted. According to the invention, the system herein can achieve calibration with higher precision with no service interrupted, does not take up extra frequency spectrum resources, and can ensure communication quality.

The invention relates to the field of heavy-water reactor fuel element bent pipe gauge calibration, and specifically discloses a heavy-water reactor fuel element bent pipe gauge calibration gauge and a field calibration method. The calibration gauge is characterized in that the calibration gauge comprises a diameter calibration gauge and a bending calibration gauge; the diameter calibration gauge includes a square bar and rectangular solids arranged at the two ends of the square bar; and the bending calibration gauge includes a reference gauge, a spherical gauge, and a wedge block gauge fixedly arranged between the reference gauge and the spherical gauge. The upper limit of diameter, the lower limit of diameter and the bending of a heavy-water reactor fuel element bent pipe gauge can be calibrated using the diameter calibration gauge and the bending calibration gauge. The quality problem of product misjudgment due to misalignment of a heavy-water reactor fuel element bent pipe gauge is avoided effectively. The manufacturing quality of nuclear power fuel elements is controlled effectively.

The invention relates to the technical field of analog integrated circuits, in particular to a calibration circuit design method for pipeline ADCs. The present invention mainly includes: establishing a pipelined ADC behavior level model, constructing the quantitative relationship between ADC analog circuit design parameters and digital calibration circuit design parameters and ADC performance; obtaining analog circuit design parameters and digital calibration circuit design that minimize ADC power consumption parameters; design the circuit according to the obtained parameters; obtain the calibration coefficient through the calibration algorithm and the reference DAC; write the calibration coefficient into the digital calibration circuit. The beneficial effect of the present invention is that the calibration circuit is greatly simplified, and all of them are implemented on-chip, so the power consumption and area are extremely small, compared with the traditional on-chip background calibration circuit, the power consumption and area are saved by more than 50%; the calibration circuit only increases the ADC core 10% of the area and 5% of the power consumption, so basically no additional chip area and power consumption; at the same time, the calibration system can be adjusted to adapt to different working environments.

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 discloses an external calibration source for an infrared radiometer in a vacuum low-temperature environment and a temperature control system of the external calibration source. The external calibration source is a square surface type black body and comprises a radiant panel (201), a heating and refrigerating device (202), a heat balance plate (203) and a radiator (204) which are sequentially and tightly contacted and fastened together through a supporting structure (205). The temperature control system comprises a calibration source controller, a power output device and a temperature sensor. A temperature sensor collects the temperature of the external calibration source in real time and feeds back the temperature to the calibration source controller in real time, and the calibration source controller compares a measured value of the temperature of the external calibration source with a set value, outputs a control signal and drives the power output device to output powerso that the power of the heating and refrigerating device of the external calibration source is adjusted. The system can be calibrated on line in real time, and measurement accuracy is ensured.