387results about How to "Improve correction accuracy" patented technology

In a virtual reference station, systematic biases existing in troposphere error corrections can be caused by elevation biases between a mobile station and reference stations, thus, the troposphere correction precision is reduced, and the positioning effect of the mobile station is influenced. The invention discloses an error correction method in a global navigation satellite system (GNSS) network differential positioning system. When comprehensive error corrections between the mobile station and the reference stations are obtained through an interpolation computation model, under the condition of considering the influences of elevations, a three-dimensional linear combination interpolation method is adopted to improve the accuracy and the reliability of network real time kinematic (RTK) differential correction information, and the real-time effective differential correction information of the mobile station is interpolated by utilizing spatially-correlated errors resolved by the reference station, including an ionosphere error and a troposphere error, according to the spatial and positional relations between the mobile station and the surrounding reference stations. By adopting the method, the troposphere correction precision can be increased to centimeter level from decimeter level in interpolation computation corrections, and the network RTK positioning accuracy is improved.

The invention discloses a real-time distortion correction method and a system of a lens with high precision and wide field of view, belonging to the field of computer vision and computer graphics. The method comprises: a preliminary correction step of establishing a projection equation and finding a space point corresponding to an image point on an image plane according to the projection equation, an optimization step of carrying out error analysis on the preliminarily corrected image to obtain the error of the preliminarily corrected image, and an LUT (Look Up Table) establishment step of correcting the deviation of the projection equation in the preliminary correction step through the error obtained in the optimization step and establishing a mapping relationship between any point on the image and a point on the space. In the invention, in order to simplify the model, the tangential distortion is ignored in the preliminary correction, but the influences caused by the tangential distortion is considered in the local optimization and the radial distortion and the tangential distortion are considered simultaneously so that a real-time correction method with high precision is provided.

The invention relates to a new energy automobile wheel hub valve hole perforation fixture with an automatic positioning function. The new energy automobile wheel hub valve hole perforation fixture comprises a support bottom plate, a rotary device, a fixing device, a clamping device and a hole drilling device. The rotary device is mounted on the top of the support bottom plate, the fixing device ismounted on the top of the rotary device, the clamping device is connected with the support bottom plate, and the hole drilling device is mounted on the clamping device. The new energy automobile wheel hub valve hole perforation fixture has the advantages that the difficult problems of incapability of fixing existing wheel hubs for existing wheel hub structures when existing valve holes are drilled in the existing new energy automobile wheel hubs in certain factories, incapability of firmly fixing the existing wheel hubs, deviation when the existing wheel hubs rotate under the control, requirements on manually polishing the existing valve holes and the like at present can be solved by the aid of the new energy automobile wheel hub valve hole perforation fixture; the new energy automobile wheel hub valve hole perforation fixture can have functions of stably fixing new energy automobile wheel hubs and drilling and polishing valve holes in the wheel hubs, the wheel hubs can be fixed for wheel hub structures by the aid of the new energy automobile wheel hub valve hole perforation fixture and can be firmly fixed by the aid of the new energy automobile wheel hub valve hole perforation fixture, the wheel hubs can stably rotate without deviation under the control, the valve holes can be automatically polished, and the like.

The invention discloses a temperature correction method for infrared temperature measurement, and an infrared thermal imager. The method completes the temperature correction through the following steps: obtaining the position vectors between N black bodies at different positions and an infrared thermometer, improving the correction precision through the black bodies at different positions, and providing a data source for the temperature correction; then, respectively measuring the temperatures of the black bodies by using a contact type temperature measuring sensor and the infrared thermometer, calculating the relative temperature differences of the black bodies, and based on the temperature differences and the spatial relationship between the black bodies and the infrared thermometer, incombination with preset parameters of the external environment such as temperature, humidity, wind speed, illumination conditions and the like, using a mathematical analysis technology to obtain correction parameters, and correcting the temperature measurement value of a measured object to complete temperature correction of the infrared thermometer. The high-precision constant-temperature controlof the black bodies is converted into real-time accurate monitoring of the temperature of the black bodies, so that the calibration cost is effectively controlled, and the temperature measurement accuracy is ensured.

The invention relates to an automatic positioning, grinding and correcting machining die for a hub of an electric automobile. The die comprises a supporting base plate, a rotating device, a fixing device, a clamping device, a drilling device and a correcting device, wherein the rotating device is arranged on the top of the supporting base plate, a fixing device is arranged at the top of the rotating device, the clamping device is connected to the supporting base plate, the drilling device is arranged on the clamping device, and the correcting device is arranged on the left side of the front end of the supporting base plate. According to the die, the problems that when some existing plants carry out valve hole drilling and flatness detecting on the hub of the electric automobile, the quality of a hub is affected due to the facts that the hub cannot be fixed aiming at the structure of the hub, deviation of positioning of the hub can occur, the hub is not fixed firmly, deviation can occurwhen the hub is controlled to rotate, valve holes are ground manually, and errors occur when a tire seat of the hub is detected can be solved.

Microlithography methods and apparatus are disclosed that allow reticle deformations to be measured and corrected quickly and accurately. Multiple alignment marks (comprising a "first set" and "second set" of reticle-position-measurement marks) are formed on the reticle. A first set of reticle-deformation data is obtained by detecting the positions of at least some of the first set of reticle-position-measurement marks using an inspection device that is separate from the microlithography apparatus with which the reticle will be used for making lithographic exposures. The first set of reticle-deformation data is stored in a first memory. The reticle then is mounted in the microlithography apparatus, in which a second set of reticle-deformation data is obtained by detecting the positions of at least some of the second set of reticle-position-measurement marks. The second set of reticle-deformation data is stored in a second memory. Lithographic exposures are performed, using the reticle so measured, while correcting the respective positions and/or deformations of the respective subfields on the fly, according to both sets of reticle-deformation data recalled from the respective memories.

The invention relates to a precompensation method for in-band group delay fluctuation of a satellite navigation signal generating system, which comprises the following steps: (1) measuring a combined S parameter of a modulator, a filter and an amplifier in the satellite navigation signal generating system, and determining amplitude-frequency and group delay characteristic of the combination of the three devices; (2) counting the group delay characteristic of a precompensation filter according to the combined group delay characteristic; (3) obtaining the phase-frequency characteristic of the precompensation filter; (4) setting the phase-frequency characteristic of the precompensation filter to be an inverse Sinc function; (5) obtaining a system function of the precompensation filter according to the amplitude-frequency characteristic and phase-frequency characteristic of the precompensation filter; (6) obtaining a unit impulse response function of the precompensation filter; (7) setting a threshold value, and setting the quantity in the unit impulse response function, which is smaller than the threshold value, to be zero to be as a coefficient of the precompensation filter; and (8) realizing the precompensaiton filter in a digital standalone of the satellite navigation signal generating system by using the coefficient of the precompensation filter, so as to compensate the group delay fluctuation of the satellite navigation signal generating system.

The present invention discloses a method for modifying the position error of the total static pressure pick-up. The method uses a wind tunnel experiment to obtain a simple modifying method for modifying the flight speed of the unmanned plane and the atmosphere static pressure data. When the modifying method provided by the invention is applied, the designing of the total static pressure pick-up and the general arrangement of the plane do not need modifying; besides the provided modifying formula is simple and definite formulated, the inner algorithm of the air data computer does not need modifying and the data can be automatically modified in the flight control software; and a higher modifying precision is provided to the typical flight condition.

The invention relates to a T-type material straightener, which comprises a stander and a transmission mechanism arranged on the stander, and is characterized by also comprising a wave bend straightening mechanism in front of the transmission mechanism and sidewise bend straightening mechanisms distributed on two sides of the wave bend straightening mechanism, wherein the wave bend straightening mechanism comprises an upper main pressure wheel and a lower main pressure wheel which are vertical and opposite; the sidewise bend straightening mechanisms comprise three side pressure wheel sets which are vertical and opposite, and a first side pressure wheel set, the wave bend straightening mechanism, a second side pressure wheel set and a third side pressure wheel set are arranged in turn along the feed direction; and pressing roll pressing planes on the three side pressure wheel sets are on the same horizontal plane as upper and lower pressing roll pressing planes of the upper and lower main pressure wheels. The T-type material straightener has compact structure and reasonable design, compared with manual flame straightening, the T-type material straightener has higher straightening efficiency and precision, and compared with common three-roll straightening, the T-type material straightener has the capability of straightening sidewise bending and angular deformation of T-type materials.

The invention discloses a grinding wheel corrector, provides the grinding wheel corrector which has the advantages of simple structure, time-saving and labor-saving operation and use, high positioning accuracy of a correcting tool, high correction efficiency and high correction accuracy, and solves the technical problems of complex structure, time-saving and labor-saving operation and use, low grinding wheel correction efficiency, poor quality and the like of the grinding wheel corrector existing in the prior art. The grinding wheel corrector comprises a bracket and a tool rest which can horizontally slide along a cross beam on the bracket, wherein the tool rest is provided with the correcting tool; a longitudinal dovetail slide rail lug boss and a longitudinal dovetail slide rail groove which are matched with each other are arranged between the cross beam of the bracket and the tool rest; and the longitudinal dovetail slide rail lug boss is slidably connected in the longitudinal dovetail slide rail groove through a longitudinal lead screw and can drive the tool rest to horizontally slide along the longitudinal direction of the bracket.

The invention discloses an elastic correction method of an airplane lifting resistance aerodynamic characteristics, which is characterized by comprising the following steps of: step 1, obtaining lifting force of a rigid wing; step 2, obtaining a lifting force correction formula; step 3, obtaining the resistance of the rigid wing; step 4, obtaining a resistance correction formula; and step 5, obtaining a correction parameter according to wings of different airplanes, and correcting the lifting force and the resistance of an airplane. According to the elastic correction method, the provided correction formulas are simple and clear to express by taking that the lifting force correction formula and the resistance correction formula of the airplane are finally provided as an aim, so that the elastic correction method is suitable for the airplane with a large span-chord ratio wing to carry out numerical value pneumatic calculation on a rigid model and elastic correction on lifting force and resistance properties characteristics after a wind tunnel test, and has higher correction precision on the airplane with the large span-chord ratio wing.

The invention provides a correction method and device for the surface shape of a polishing disk in full-caliber polishing. The correction method for the surface shape of the polishing disk in full-caliber polishing comprises the following steps that (1) errors of the surface shape of the polishing disk are detected, and fixed point removal functions of the correction device are determined; (2) a correction path covering the whole surface of the polishing disk is set; (3) residence time is calculated; (4) the correction path obtained in the step (2) and the residence time, obtained in the step (3), of all points on the path are input into a numerical-control machining system, and correction machining is performed on the surface of the polishing disk. The errors of the surface shape of the polishing disk are eliminated by controlling the residence time, on all the points of the surface of the polishing disk, of the correction device; compared with a traditional disk surface shape correction method of adopting a large-size correction plate, the correction method has the advantages of being good in correction control determinancy and high in correction accuracy.

The invention discloses a reflow welding process simulation model correction method based on measured temperature data. By analyzing the standard deviation between the actually measured temperature curve data and the correspondingly simulated temperature curve data, a numerical simulation correction model which takes the minimization of the standard deviation between the node temperatures corresponding to the actually measured curve and the simulation curve as an optimization target and takes the temperature of the temperature zone and the convective heat transfer coefficient as optimization variables is established. The model is optimized by adopting a response surface method and a multi-objective genetic optimization algorithm method, so that the result of the numerical simulation modelis consistent with the actually measured temperature, the corrected numerical simulation model is obtained, and the accuracy of subsequent simulation prediction can be improved through feedback adjustment of one-time physical test. According to the method, the reflow welding process simulation model is corrected by a method of combining finite element simulation and tests, so that the simulation efficiency and precision are effectively improved.

The invention provides a calculation and correction device and a method for the state of charge (SOC) of a marine power lithium ion battery. An SOC calculation link is used for calculating the SOC of all groups of batteries based on an ampere hour metering method, an SOC error compensation link is used for carrying out compensation correction on an result measured by the SOC calculation link based on an alternating current internal resistance, and the SOC error compensation link operates for each certain time; when the SOC error compensation link operates, a compensated result is outward output as an SOC output signal; when the SOC error compensation link does not operate, the SOC of all the groups of batteries, measured by the SOC calculation link in real time based on the ampere hour metering method, are outward output as an SOC output signal. The calculation and correction device is simple in structure, fast in calculation speed, high in correction accuracy, and high in real-time property. The calculation and correction device and the method are applicable to a marine lithium battery pack which is large in battery power demand, and higher in voltage.

The invention relates to a compensation device of a system for detecting and correcting human eye wave-front aberrations, and the compensation device is arranged inside the system for detecting and correcting human eye wave-front aberrations. The compensation device comprises a focusing system that consists of an expanded beam lens, a collimating lens and an electrically-controlled precise translation stage, wherein the collimating lens is fixed at the movable end of the electrically-controlled precise translation stage and also connected with a computer control system. The compensation device further comprises a defocusing compensation system that is arranged between a light splitter and a deformable mirror and consists of a telescopic system and an electrically-controlled precise translation stage, wherein the electrically-controlled precisen translation stage is arranged between two lenses of the telescopic system and connected with the computer control system. Compared with the prior art, the compensation device has the advantages that: the compensation device has good continuity and can correct various defocusing amount without limitations as compared with an insertion-type compensation method; and the compensation device is advantageous in high accuracy, rapidness and accurate displacement as compared with a manual translation stage.

The invention relates to a control method for removing the overshoot of a displacement generated by the soft start of a vibrating meter under three-parameter control. Based on the three-parameter control, the method provides an overshoot-correcting arithmetic of an off-line time domain: the method obtains an overshoot theory solution generated by the three-parameter control arithmetic by solving a three-parameter control differential equation in the time domain; and in order to directly remove a transient state component, and by taking trigonometric function and Fourier transform as tools, the method provides a correction method of the overshoot under any input. Compared with the conventional soft start in a windowing way, the method reduces the overshoot, and greatly reduces the on-line calculating amount, thereby improving the operating efficiency of a controller when removing the overshoot of the displacement of the vibrating meter.

The invention discloses a correction method of a matrix dynamics model based on a structure modal test, which comprises the following steps of: calculating correction quantities of a mass matrix and a rigid matrix of a finite element model by using a modal experiment result of a new structure generated through simultaneously changing mass distribution and rigidity of the structure for many times and using matrix calculation and algebraic equation solution. The method improves the correction precision of the finite element model with simpleness and feasibility.

A method and display device for correcting spatial non-uniformity in a display device are provided.. The method includes receiving color signals of a pixel to receive the pixel, extracting correction data for correcting adjacent representative color signals which represent areas adjacent to the received pixel, and correcting the adjacent representative color signals using correction data and correcting the color signals of the pixel using the corrected adjacent representative color signals.

The method relates to a posture correction method and apparatus. The method includes: step a. detecting posture parameter values caused by head swing, with the posture parameters including course angle, roll angle and pitch angle values; step b. conducting parameter processing on the measured posture parameters; step c. interpreting the processed posture parameters to obtain each of the angle values of a corrected person; step d. carrying out noise elimination treatment on each of the angle values by a Kalman filter; step e. conducting real-time fusion treatment on the angle values to obtain real-time dynamic posture data; and f. comparing the real-time dynamic posture data with preset posture data, if the current posture is not in a preset posture range and the duration exceeds a designated time, giving alarming prompt. The apparatus consists of a posture sensor, a control chip, and an alarm. In this way, the posture of the corrected person can be corrected simply and rapidly.

The invention provides a test paper correcting method and a test paper correcting device. The test paper correction method comprises the steps of obtaining a test question image and an answering arearule; determining an answering area image according to the answering area rule and the test question image; identifying answer text information in the answer area image; comparing the answer text information with standard answer information corresponding to the test question image; correcting the test paper according to a comparison result of the answer text information and the standard answer information. Therefore, intelligent correction of paper test paper objective questions is realized; the problem that in a common examination process, if no answer sheet exists, paper can only be manuallymarked by a teacher is avoided; the time of teachers can be greatly saved, the test paper correcting efficiency is improved, errors are reduced; compared with the prior art, correction can be more flexibly carried out in a fine-grained mode, meanwhile, the problem that multiple sub-answers exist in one question is solved, the correcting accuracy is greatly improved, and the correcting efficiencyand subject flexibility are improved.

The present invention belongs to the radiotherapy field and discloses a method or apparatus for correcting the subsidence amount of a sickbed. The method comprises the following steps that: the image of a patient is obtained; the distribution function of the subsidence amount of the sickbed is searched according to the weight of the patient and the movement distance of the sickbed, a subsidence amount corresponding to the image is obtained, and the distribution function of the subsidence amount of the sickbed is the distribution of the relative subsidence amount of the sickbed with respect to the weight of the load and the movement distance of the sickbed; and the subsidence amount is utilized to correct the image or the arrangement error of the patient. With the method or apparatus for correcting the subsidence amount of the sickbed of the invention adopted, the relative subsidence amount of a radiotherapy device and an imaging device can be corrected, the relative subsidence amounts of the sickbed at the imaging device side which are obtained under a condition that the sickbed moves different distances can be corrected, and correction accuracy is higher.