80 results about "Relative precision" patented technology

The invention relates to the field of precise engineering survey, in particular to a method for rapidly measuring a foundation pile control net (CPIII) of a rapid transit railway on the basis of movable laser radar measuring technology and high-speed digital imaging technology. control net (CPIII) measurement data is obtained by using a movable high-precision measurement system comprising a laser scanner (1), a GPS/IMU positioning and orientating system (2), a high-speed digital imaging system (3), an industrial computer (4) and a power supply device (5); and united weighted adjustment is carried out on advanced net data, united measured data and auxiliary measurement points extracted from images to obtain high-precision control net (CPIII) control point coordinates. The invention can greatly shorten the measurement time of the control net (CPIII), overcomes the defect of little total correlation of discrete single-point measurement, carries out integral adjustment on all control points, has good closing property and high relative precision, obtains plane and elevation coordinates of all control points, and greatly simplifies the measurement work of the control net (CPIII).

The invention is applicable to the field of machine visual and three-dimensional measurement and provides a target correction method and system. The embodiment of the invention provides the target correction method, comprising the following steps of: photographing a target from different angles to obtain a plurality of images; respectively extracting the center of a marking point in each image as a characteristic point and establishing a corresponding relation of the marking points with the same name between the images; combining a close-range photogrammetry technology to calculate a three-dimensional coordinate of the characteristic point, wherein the three-dimensional coordinate is restrained by a scale factor; finally obtaining the scale factor and zooming the three-dimensional coordinate of each characteristic point to an actual size. The target manufactured and corrected by the method has the advantages of higher precision, easiness for operation and low cost. Meanwhile, the scale factor is obtained by adopting a fringe projection measurement system and a standard ball, the correction precision is higher and the relative precision (absolute precision/target size) can reach 1:1000. Therefore, the method and the system provided by the invention can be widely applied to the vision measurement and the system calibration.

The invention relates to a self-capacitance change measuring circuit with high precision and high stability. A filter capacitor in a system discharges through a switch circuit of a measured capacitor and is charged through a switch circuit of a coupling capacitor so as to change the voltage of the filter capacitor at the vicinity of a reference voltage. As discharging current generated by the switch circuits of different measured capacitors is different, the time that the voltage of the filter capacitor is lower than the reference voltage and the time that the voltage of the filter capacitor is higher than the reference voltage change; and the change of the measured capacitor can be measured by measuring the time change or the change of a ratio of the time. By an error elimination method, the voltage fluctuation and the metering clock error do not influence the measuring result; and the entire measuring result is only related to the error of the coupling capacitor. As the coupling capacitor built in a chip has high stability and high precision, the measurement method has excellent measuring precision and stability.

The invention discloses a management system of a battery. The management system of the battery comprises a data acquisition device and an intelligent processing device, wherein the data acquisition device acquires real-time state parameters of the battery; and the intelligent processing device is positioned at a terminal, at least estimates SOC (state of charge) value and/or SOH (state of health)value of the battery according to the real-time state parameters and transmits the estimation value to a cloud platform. The invention also discloses a management system of the battery. An artificialintelligent model with relatively high precision is obtained by estimating the SOC and the SOH of the battery at the terminal, analyzing the estimation values by the cloud platform and training a neural network model, and the precision of the terminal model is improved by the training result, so that the use safety of the power battery can be greatly improved, warning is conducted in advance, combustion of the battery is avoided, the use value and the energy utilization efficiency of the power battery are greatly improved and powerful scientific basis is provided for normalizing the power battery product market.

The present invention discloses an InSAR high precision and high resolution DEM acquisition method combined with an external control point. The characteristics of high resolution, high relative precision, large coverage range and high ground control point absolute precision of an InSAR monitoring mean are fully integrated, the low InSAR obtainment DEM absolute precision is solved, the defects of the low cost-effectiveness ratio and the influence of cloud of obtaining high resolution mapping of a traditional DEM obtainment method such as airborne and airborne optical and laser height measurement mean, time-consuming and labor-consuming of ground mapping and no obtainment of a whole field mountain high resolution topography are overcome. The structure of the whole process is clear, and the method has the advantages of simple realization, low cost, high monitoring precision, large monitoring range, and high degree of automation.

Provided is an automated determination of an optimized parameterization of a scatterometry model for analysis of a sample diffracting structure having unknown parameters. A preprocessor determines from a plurality of floating model parameters, a reduced set of model parameters which can be reasonably floated in the scatterometry model based on a relative precision for each parameter determined from the Jacobian of measured spectral information with respect to each parameter. The relative precision for each parameter is determined in a manner which accounts for correlation between the parameters for a combination.

The invention provides a printing device and a printing method. A double-rail structure is adopted in the invention. To put it in another way, two different conveying track, namely a conveying track of belts (31A,21A,32A) and a conveying track of belts (31B,21B,32B) are equipped on a printing platform (20). Two base plates (1A,1B) can be fixed on the printing platform (20). When the relative precision difference between the deviation of a printed pattern corresponding to the base plate (1A) and that of the printed pattern corresponding to the base plate (1B) is within a permitted range, pastes can be printed on the base plates (1A,1B) together through one movement of a scraper. In this way, by the simple structure, pastes can be printed on a plurality of base plates with high precision and high efficiency.

A geometric positioning precision analysis method for a remote sensing satellite without a ground control point comprises the following steps: S1, establishing a strict imaging model, and rewriting the strict imaging model to obtain a strict model geometric positioning equation; S2, generating RPC parameters independent of terrains; S3, checking the absolute geometric positioning precision of theRPC coefficient of the image product according to an image angular point method, and judging whether the RPC coefficient of the image product can be used as the reference data of geometric precision analysis and checking or not; verifying the internal coincidence precision of the RPC coefficient generated without depending on a terrain method according to a check point method, and eliminating errors possibly introduced by RPC coefficient calculation; according to a cross validation method, obtaining the relative precision of the RPC coefficient generated without depending on a terrain method and the RPC coefficient of the image data product; and obtaining a direct geometric positioning precision analysis conclusion of the on-orbit optical remote sensing satellite. According to the method,the analysis and calculation of the geometric positioning precision of the remote sensing satellite are realized.

The present invention is directed to endoscopic structure illumination to provide simple, inexpensive 3D endoscopic technique to conduct high resolution 3D imagery for use in surgical guidance system. The present invention is directed to an FPP endoscopic imaging setup which provides a wide field of view (FOV) that addresses a quantitative depth information and can be integrated with commercially available endoscopes to provide tissue profilometry. Furthermore, by adapting a flexible camera calibration method for the 3D reconstruction technique in free space, the present invention provides an optimal fringe pattern for the inner tissue profile capturing within the endoscopic view and validate the method using both static and dynamic samples that exhibits a depth of field (DOF) of approximately 20 mm and a relative accuracy of 0.1% using a customized printed calibration board. The presented designs enable flexibility in controlling the deviated angle necessary for single scope integration using FPP method.

The invention belongs to the technical field of the power grid control, and especially relates to a control structure and control method of a photovoltaic grid-connected inverter. The control structure of the photovoltaic grid-connected inverter can realize the synchronous control effect on the grid-connected voltage and current by an inverter and improve the power factor, and further can effectively inhibit the harmonic pollution, eliminate steady-state error, resist system power grid frequency interface, and improve the stability of the system. The inverter created by the invention has goodgain effect, a retention signal is used for improving a tracking effect, and the capacity of resisting power grid frequency disturbance of the inverter is improved by optimizing a system function; thegrid-connected inverter can effectively eliminate the steady-state error, the capacity of resisting system power grid frequency interference is enhanced by enlarging the bandwidth, and the bad influence caused by resisting the power grid frequency change by the inverter is enhanced through the control function; the system stability is improved by enlarging the system bandwidth, and the relative precision of the system is improved.

The invention relates to a distribution type joint iteration locating algorithm, in particular to a distribution type joint iteration locating method applied to network node locating of a sensor. The method solves the problems that an existing DILOC has limitation, anchor node utilization rate is low, and node energy consumption is increased. The distribution type joint iteration locating method applied to network node locating of the sensor comprises the following steps of improvement of a convex hull test method and joint locating. The distribution type joint iteration locating method can complete selection of coordinate computing nodes of unknown nodes under the condition of a small communication radius, so that node energy is saved; the number of equivalent anchor nodes located by second iteration is increased, iteration frequency is reduced, and relative precision is high. The distribution type joint iteration locating method applied to locating the sensor network node can be applied to the field of network locating of a wireless sensor.

The invention provides a process for processing the high-accuracy phase difference of a duplicate gear. The process adopts a gear aligning tool. According to the process, a finely ground pinion and a coarsely ground gearwheel are assembled in an assembly tool to ensure the concentricity of the pinion and the gearwheel, and the phase angle deviation is controlled in a certain range; gear teeth of the gearwheel are finely ground on a gear grinding machine by taking the positioning reference of gear teeth of the pinion shaft as the gear grinding reference of the gearwheel, so that the relative accuracy of gear forms of the pinion and the gearwheel can be improved, the condition that the phase difference of a duplicate gear is less than 10seconds can be ensured, and the duplicate gear can achieve high-accuracy phase difference. The process is very applicable to transmission of a high-accuracy duplicate gear.

The invention discloses a method for measuring a spectrum occupation ratio, which comprises the following steps: detecting signal strength in a channel, and comparing the detected signal strength with a threshold to obtain a comparison result sequence; and according to the law of large numbers and central limit theorem, analyzing the comparison result sequence by following the normal distribution law, and estimating the spectrum occupation ratio, a confidence interval and relative accuracy thereof. The invention also discloses a device for measuring the spectrum occupation ratio. The method and the device can ensure that the measured spectrum occupation ratio has a reasonable confidence interval; besides, under the condition of the same confidence level and relative accuracy, the number of sampling points is much less than that of sampling points in the prior art, particularly under the condition of a high occupation ratio.

A method for analyzing hydrogen sulfide in coke oven gas comprises the following steps: establishing an analysis condition; preparing 8 L standard sample gas; controlling the content of hydrogen sulfide in the standard sample gas at 100-10000 mg/m3; analyzing the standard sample gas by using a gas chromatograph with a flame photometric detector; drawing an analysis result into a standard sample gas quadratic equation curve graph by using an external standard method calculation formula; collecting sample gas; analyzing the sample gas on the gas chromatograph with the flame photometric detector by using the same method as for the standard sample gas; and figuring out the content of hydrogen sulfide in the sample gas by using the quadratic equation curve graph obtained during analyzing the standard sample gas. According to the invention, the test sample analysis time of detecting the content of hydrogen sulfide in the gas is reduced from the original at least 2 hours to less than 3 minutes; small system error, reliability of more than 95% and relative precision standard deviation of less than 2.5% are achieved; and timely instruction information is provided to production.

The invention relates to a structure steady design method with an uncertain load action point position. The structure steady design method with the uncertain load action point position comprises the following steps: S1: establishing a continuous body structure steady optimization model; S2: according to a distribution form of the load action point position borne by the structure, and a Gaussian quadrature node position, selecting a plurality of foundation working conditions; S3: initializing a design variable; S4: carrying out finite element analysis on each foundation working condition to obtain a corresponding structure displacement vector; S5: calculating the mean value and the standard deviation of structural flexibility; S6: carrying out sensitivity analysis on the structure; S7: utilizing an asymptote method to update the design variable; and S8: judging whether a termination condition can be met or not, stopping iteration if the termination condition can be met, and otherwise, repeating S4 to S7 until an iteration termination condition is met. The structure steady design method has the advantages of being small in calculation amount, high in relative precision, and simple in implementation on the basis of a traditional topological optimization foundation.

The invention relates to a machining method of a universal die holder. The machining method comprises the following steps: step 1, performing rough machining operation on upper and lower end surfacesand four circumferential surfaces of a movable template and a fixed template; step 2, centering and boring the movable template and the fixed template and respectively finding out centers of the movable template and the fixed template; step 3, fixing the movable template and the fixed template to a CNC machining center above and below, enabling the centers of the movable template and the fixed template to be superpose vertically meanwhile guide column holes of the movable template and the fixed template are machined with the center of the movable template as a central point; step 4, continuingto ream the guide column holes with the center of a guide column hole of the movable template as the center and machining guide sleeve holes; step 5, machining guide sleeves; step 6, machining guidecolumns; step 7, assembling the movable template, the fixed template, the guide columns and the guide sleeves to be a die holder. Firstly, the movable template and the fixed template are drilled withthe guide column holes. Secondly, reaming operation is carried out on the guide column hole in the movable template. Therefore, relative precision between the guide column holes and the guide sleeve holes is ensured.

A method for determining the crankshaft position of an internal combustion engine is described with which, in the event of failure of the crankshaft sensor, the crankshaft position may be determined with relative precision at all times. For this purpose, the camshaft position is continuously detected by an absolute angle sensor, preferably in a defined time grid. By analyzing the camshaft positions detected in that way, a value for the instantaneous crankshaft position is determined.

The invention provides a method and device for optimizing a relative precision map, and a storage medium. The method comprises the steps: carrying out the absolute precision measurement of at least one key landmark in a specific environmental region, and obtaining the posture of at least one key landmark; constructing a relative precision map of the specific environmental region, and building a posture map model of the relative precision map, wherein the start point and end point of the posture map model are not coincided; and optimizing the posture map model through the posture of at least one key landmark.

A cluster-based fault critical clearing time parallel computing method distributes computing cores according to search interval lengths of faults and ensures the faults with great search intervals to receive more cores. If the tap position split step size of the fault is less than the computing accuracy, the number of cores required by the fault is determined according to the computing accuracy demand. When the absolute accuracy is adopted, if the tap position split step size meets the convergence accuracy, longer observation time is adopted to directly obtain the transient state security CCT and dynamic security CCT through once iteration; else, shorter observation time is adopted to obtain transient security CCT and set the transient security CCT as the upper limit, and then the longer observation time is utilized to obtain the dynamic security CCT. When the relative accuracy is adopted, the transient security CCT is firstly obtained and the dynamic security CCT is subsequently obtained. When the security stability indexes of various power systems are taken into consideration, the minimum one of the angle stability CCT, the voltage security CCT, frequency security CCT and dynamic security CCT is obtained.

A system method, and computer program product for individual aircraft pollution tracking, including at least one of real-time pollution tracking and pollution estimation of individual moving aircraft, wherein the pollution estimation is equal in accuracy as relative accuracy of employed inputs; pollution estimation for various aircraft, and various types of pollution based on suitably available raw data; and pollution estimation including filtering of outputs and formatting thereof to provide usability for comparison to regulation criteria and assessments of pollution mitigation efforts, including fleet mix, level of technology, and pollution attainment determination.

The invention provides a synchronization method in satellite communication. The synchronization method includes the following steps that a. a satellite conducts smooth calculation on an ephemeris output by a global positioning system (GPS) module to obtain a smoothened ephemeris; b. the satellite broadcasts and issues the smoothened ephemeris periodically, and a ground terminal starts ranging periodically; and c. the ground terminal conducts track extrapolation according to the received smoothened ephemeris and synchronizes with the satellite according to track extrapolation results and ranging results. The track extrapolation results are compensated through the ranging results so that relative precision is high. Compared with the prior art, the real-time performance is good, the structure is simple, and the cost is low.

A semiconductor integrated circuit is characterized in that it comprises analog macros each having a comb capacitor (10), each comb capacitor (10) is composed of comb-shaped electrodes (11, 12), the comb tooth portions (13) of the electrode (11) and the comb tooth portions (14) of the electrode (12) are so interdigitized that the comb tooth portions (13) and the comb tooth portions (14) are alternated and parallel to one another, and the tooth portion intervals (S) are varied according to the absolute accuracy indicating the difference between the actual capacitance and the ideal capacitance or the relative accuracy indicating the differencebetween the capacitances of the adjacent comb capacitors. A high-accuracy analog macro comprising a comb capacitor whose high capacitance accuracy is ensured and a semiconductor integrated circuit comprising highly-integrated analog macros are provided.

The invention discloses an ultrastrong femtosecond laser pulse all-parameter in-situ measurement system and measurement method and application. Femtosecond laser pulses are measured through X-ray; all parameters of the femtosecond laser pulses can be derived through a photoelectron spectroscopy obtained through measurement, including strength, pulse time width, carrier-envelope phase and pulse shape; the measurement method is a physical method, and no hypothesis is needed; and the measurement method is an analytic method, and time resolution measurement, data fitting and iterative computations are not needed. The measurement method is an in-situ measurement method, no change is needed to be made for the state of the femosecond laser pulse to be measured, the measurement result can directly reflect the physical relevance among all the parameters, and the measurement result is real-time, rapid and high in precision. The range of laser strength can reach 4-5 orders of magnitudes, the relative precision of the method is 0.1 % better than the precision of the laser strength, and is 1 % better than other parameters, and the method can widely be applied to scientific experiments and engineering surveying.