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45 results about "Statistical error" patented technology
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Definition: A statistical error is the (unknown) difference between the retained value and the true value.
Intelligent identification method for commodity image of vending machine
ActiveCN119360132ACoin-freed apparatus detailsCharacter and pattern recognitionImage extractionProcess engineering
The invention relates to the technical field of vending machines, in particular to a vending machine commodity image intelligent recognition method which comprises the following steps: step 1, installing a camera in a vending machine, and performing spatial calibration on the camera; 2, the camera scans the commodities on the shelf to generate a commodity initial state table; and step 3, the camera performs real-time detection on commodity states and obtains commodity images, extracts the state information of all commodities in each frame of image, compares the state information of the commodities in the current frame of image with the state information of the commodities in the previous frame of image, judges whether the commodities are taken out, put back or adjusted in position, and outputs a commodity real-time state table. According to the scheme, through the feature data generated by the classification model, the interaction record of the user can be tracked, the commodity real-time state table is dynamically updated in the vending machine system, and accurate guarantee is provided for commodity inventory management; and through the error correction model, the camera can identify the commodity image more accurately, and the identification statistical error is reduced.
Owner:Hangzhou Qianjing Technology Co., Ltd. +1
Multi-rock mass fracture parameter prediction method and rock mass fracture model construction method based on Markov chain and Kriging method
The invention discloses a rock mass fracture parameter prediction method and a rock mass fracture model construction method. The prediction method comprises the following steps: determining the scale of a fracture unit by using a first-order Markov test theory, and dividing the fracture unit of a known parameter region according to the scale of the fracture unit; performing optimal transfer matrix calculation on the fracture density of the divided fracture units by using a first-order Markov chain theory; performing fracture density prediction on the unknown parameter region by using the optimal transfer matrix obtained by calculation, and completing height data distribution of a trace midpoint and a fracture surface in a uniform distribution form; using a Kriging interpolation estimation method to complete occurrence prediction of the fracture at the distributed position; and using a Kriging interpolation estimation method to complete trace length prediction of the fracture at the distributed position. According to the method, the Markov chain and Kriging interpolation estimation methods are fused to predict and estimate the density, occurrence, trace length and other parameters of rock mass fractures, and statistical errors are greatly reduced.
Owner:HEBEI UNIV OF TECH +1
A low-altitude navigation system safety accelerated evaluation method and system based on cross-entropy-importance sampling alternative iteration
This invention discloses an accelerated safety assessment method and system for low-altitude navigation systems based on alternating cross-entropy and importance sampling, relating to the fields of computer simulation and safety assessment technology. The method includes: constructing a probabilistic risk assessment model and initializing a proposal distribution; entering an alternating iterative loop: first, performing importance sampling assessment, calculating accident rate estimates and statistical errors; if the error does not meet accuracy requirements, initiating cross-entropy optimization, updating the proposal distribution parameters using simulation data; the new distribution is fed back to the next round of assessment. This loop continues until the results converge, and an assessment report is output. This invention, through a closed-loop feedback mechanism of alternating assessment and optimization, enables the sampling distribution to adaptively approximate the optimal distribution, intelligently focusing simulation resources on high-risk scenarios, solving the computational efficiency bottleneck of assessing extremely low probability events, achieving an order-of-magnitude improvement in assessment efficiency, and possessing high adaptability and engineering practical value.
Owner:BEIHANG UNIV
Statistical Method and Device for Biological Migration Flux of Insect Radar
ActiveCN115343720BElectromagnetic wave reradiationComplex mathematical operationsComputational physicsFixed Beam
The present invention discloses a method and device for statistically calculating the biological migration flux of insect radar, belonging to the technical field of insect radar, which solves the problem of statistical error caused by the deviation of the position of insect movement from the beam normal line, and helps to improve the accuracy of statistical calculation of insect migration flux. The technical solution of the present invention is as follows: In the vertical measurement mode, a statistical method model for insect migration flux is established, and the statistical unit (k,n) is defined; the actual distance that all insects pass through the beam is obtained; an estimation model of the radar beam and the position where the migrating insects pass through the beam is established, and the deviation parameter is obtained based on the longest distance that the target passes through the beam and the actual distance that the target passes through the beam; the statistical method is used to estimate the insect migration flux, and the flux statistical results of different altitude layers are obtained. According to the expression of the migration flux in the fixed beam mode of vertical measurement and the flux statistical results of different altitude layers, the expression of the migration flux in the fixed beam mode of any direction and the flux statistical results of different altitude layers are obtained.
Owner:BEIJING INST OF TECH
A frequency standard measurement method, device, computer equipment and storage medium
ActiveCN120102972Bincrease the lengthImprove reliabilityFrequency to pulse train conversionAverage filterFrequency measurements
The application provides a frequency standard measurement method, device, computer equipment and storage medium, the method comprises: frequency source output measurement signal is carried out frequency division processing, obtains low frequency pulse signal; using high-precision time interval counter to low frequency pulse signal is carried out delay measurement and time interval counting, and is output in the form of time stamp; by setting a sliding window, using sliding average algorithm to time stamp is carried out sliding average filtering processing, all time stamps are carried out sliding difference to obtain time difference, time difference is grouped according to order and is taken average in group to obtain average time difference; by increasing the length of the sliding window, the number of samples is increased to reduce the statistical error; using average time difference, calculate frequency measurement value, relative frequency deviation and allan variance. The method of the application increases the sliding window, and the frequency measurement result obtained by the algorithm of grouping and averaging the time difference has higher measurement precision and stability.
Owner:XINGHAN SPACE TIME TECH (CHANGSHA) CO LTD
Intelligent top pipe splitting method based on BIM (Building Information Modeling) technology
PendingCN121936145ARespond quickly to changesreduce statistical errorGeometric CADDesign optimisation/simulationSoftware engineeringSelf adaptive
The invention discloses an intelligent top pipe splitting method based on a BIM technology. The method comprises the following steps that 1, a first Revit self-adaptive pipe joint family is manufactured; 2, generating an overall model of the pipeline according to a projection path of the pipeline by using the first Revit self-adaptive pipe joint family; 3, by means of Dynamo software, the splitting fixed length and the splitting distance of the pipeline are preset, segmentation is conducted, and multiple segments of segmented curves are obtained; 4, processing all the segmentation curves through Boolean operation by utilizing Dynamo software to obtain corresponding segmentation curves segmented into accurate lengths; 5, by utilizing Dynamo software, generating all pipe joints after the pipeline is segmented through the segmentation curve; 6, according to a preset corner threshold value of the adjacent pipe joints, the corner between the adjacent pipe joints is calculated; and 7, exporting a detailed list of all the pipe joints. According to the method, design and machining can be quickly joined, the material statistical error is reduced, and the design and machining efficiency is improved.
Owner:HEFEI MUNICIPAL DESIGN INST
A gate group timing flow anomaly diagnosis method based on statistical error analysis
ActiveCN119004329BVolume/mass flow measurementTesting/calibration for volume flowDiagnosis methodsCurve fitting
The application discloses a kind of based on statistical error analysis's gate group timing flow abnormal diagnosis method, comprising the following steps, S1, flow data pre-processing based on filtering method;S2, flow error distribution analysis;S3, based on k up / down Reasonable flow error range determination of σ rule;S4, over gate flow coefficient relationship curve fitting;S5, theoretical gate station flow calculation;S6, abnormal flow data diagnosis and correction.The advantage is: the method can make full use of the specific monitoring error distribution characteristics and monitoring variable mapping relationship of different gate stations, reduce the missed detection or false detection rate.Through introducing the real error distribution of flow monitoring data in the abnormal data diagnosis model, the specific monitoring error range of specific project is determined, and the reliability of flow abnormal diagnosis process is improved.
Owner:CHINA SOUTH-TO-NORTH WATER DIVERSION GRP MIDDLE LINE CO LTD +1
Converter blanking automatic statistical system developed based on intouch configuration software
PendingCN120892473ADigital data information retrievalProgramme control in sequence/logic controllersSteelmakingData acquisition
The invention discloses a converter blanking automatic statistical system based on intouch configuration software development, relates to the technical field of steelmaking process analysis, and is used for automatically collecting and counting converter blanking weight data and generating a report so as to improve the accuracy and analysis efficiency of steelmaking process data. The display module is used for selecting bin blanking types and displaying statistical results; the data acquisition and storage module is used for acquiring the weighing data of the stock bin through a PLC (Programmable Logic Controller); the data processing and association module adopts an enumeration comparison method to merge the weights of similar materials; and the dynamic report generation module dynamically generates a header and updates the statistical table. According to the method, under the condition that the blanking types of the stock bin are changed, automatic statistics of the blanking types, weight and other data can be achieved through simple operation, the data are displayed on an operation picture in a table form, the problems that in the prior art, manual statistics errors are large, and table updating efficiency is low are solved, and powerful support is provided for data analysis of the steelmaking process.
Owner:YANGCHUN NEW STEEL CO LTD
Charging pile availability rate determination method and charging pile monitoring system
ActiveCN121608633ACharging stationsElectric vehicle charging technologyMonitoring systemControl theory
The invention is suitable for the technical field of charging piles, and provides a charging pile availability determination method and a charging pile monitoring system. The method comprises the steps of obtaining target state data and target fault data of a target charging pile based on an identifier of the target charging pile and a target time interval; state data correction is performed according to an acquisition result of the target state data and the target time interval, and an online time interval of the target charging pile is determined according to a correction result; de-duplicating the obtained target fault data, and obtaining a fault time interval of the target charging pile according to a de-duplicating result; and determining the availability rate of the target charging pile based on the online time interval and the fault time interval. According to the method, statistical errors of the online time interval and the fault time interval can be reduced, the availability rate of the charging pile can be accurately obtained, the state of the charging pile can be timely and accurately mastered subsequently, the charging pile is reasonably used and maintained, meanwhile, the determination process of the availability rate of the charging pile is simplified, the calculation amount is reduced, and the efficiency is improved.
Owner:SHENZHEN KEHUA HENGSHENG TECH
Robust sub-sampling method based on influence function
PendingCN120763465ADigital data information retrievalMachine learningStochastic gradient descentData set
The invention discloses a robust sub-sampling method based on an influence function. The method comprises the following steps: constructing a model and a robust sub-sampling problem; based on a robust iteration sub-sampling algorithm, data points which are close to a clean subset as much as possible are screened out from a data set through step-by-step iteration, it is ensured that after finite iteration, sub-sampling data are from unpolluted samples, and the optimal statistical error boundary of parameter estimation is obtained; calculating a gradient by using a robust sub-sampling method in each iteration based on a robust small-batch stochastic gradient descent algorithm, and updating parameters based on the gradient; the sub-sampling method provided by the invention realizes an approximately optimal error rate and provides a strong robustness guarantee.
Owner:YUNNAN UNIV
Frequency scale measurement method and device, computer equipment and storage medium
The invention provides a frequency scale measurement method and device, computer equipment and a storage medium, and the method comprises the steps: carrying out the frequency division processing of a measurement signal outputted by a frequency source, and obtaining a low-frequency pulse signal; carrying out delay measurement and time interval counting on the low-frequency pulse signal by using a high-precision time interval counter, and outputting the low-frequency pulse signal in a timestamp form; the method comprises the following steps of: setting a sliding window, carrying out sliding average filtering processing on timestamps by utilizing a sliding average algorithm, carrying out sliding action difference on all the timestamps to obtain time differences, grouping the time differences in sequence, and averaging in groups to obtain average time differences; the number of measured samples is increased by increasing the length of the sliding window, so that statistical errors are reduced; a frequency measurement value, a relative frequency deviation and an Arron variance are calculated using the average time difference. According to the method provided by the invention, the sliding window is increased, and the frequency measurement result is obtained by using the algorithm of grouping and averaging the time difference, so that the method has higher measurement precision and stability.
Owner:XINGHAN SPACE TIME TECH (CHANGSHA) CO LTD
Organ-like culture pore plate convenient for statistics and positioning
ActiveCN223813516UBioreactor/fermenter combinationsBiological substance pretreatmentsStatistical analysisExperimental data analysis
The utility model discloses an organoid culture pore plate convenient to count and position, which belongs to the technical field of cell culture and comprises a culture pore plate, a plurality of pore grooves are arranged on the culture pore plate, scale marks are arranged at the bottoms of the pore grooves, and the scale marks comprise a plurality of transverse lines and a plurality of longitudinal lines which are uniformly distributed outwards by taking the circle centers of the pore grooves as centers. According to the utility model, orientation coordinates in the pore plate are arranged, so that the dynamic growth process of the organoid can be conveniently positioned and observed, regular counting of each organoid in each pore is facilitated, the budding number is calculated, and the accuracy of statistical analysis is improved; by setting the grids, the organoid can be located in a grid with a fixed area, so that the area can be conveniently calculated without being limited by different shooting machines or software, the efficiency of experimental data analysis is improved, and calculation or statistical errors are reduced; the same type of organs are continuously observed through scale line positioning, the efficiency of organoid culture experiment operation and data analysis and the data reliability are improved, and the device has very high practicability and wide application prospects.
Owner:XIEHE HOSPITAL ATTACHED TO TONGJI MEDICAL COLLEGE HUAZHONG SCI & TECH UNIV
Method and device for automatically capturing exposure information of page component, medium and equipment
The invention relates to the technical field of internet information, can be applied to the fields of financial advertisement putting, user behavior analysis and the like, and provides a page component exposure information automatic capturing method and device, a medium and equipment. When rolling stops or the rolling speed is lower than a threshold value, the current position of each assembly in the window is calculated according to the rolling distance and direction; for the component element, marking the component element as an exposure state when the component element enters the visible range for the first time, and recording an entry timestamp; if the video is marked and is still in the visible range, updating the staying duration; if the user leaves the visual range, recording a leaving timestamp and calculating a single-time stay duration; the staying duration is accumulated as the total staying duration during multiple times of entering and exiting, and when the total duration exceeds the preset minimum effective duration, the data are marked as effective exposure data, and the effective exposure data are encrypted in batches through a buffer queue and then reported to a server. By automatically capturing and analyzing the component exposure information, manual statistical errors can be reduced, and the data accuracy is improved.
Owner:SHANGHAI JIEYIN E-COMMERCE CO LTD
Computer-implemented method for creating a 3D body joint position of an object
The disclosure includes a computer-implemented method (100) for determining a 3D body joint position (20) of an object (70) comprising the following steps: - generating (102) a first 2D body joint position (12) for at least one body joint point (10) of the object (70) based on a body joint position data set (30) which contains at least one image from a plurality of camera perspectives; - Manually annotating (104) a second 2D body joint position (14) based on the body joint position data set (30) to determine an error deviation of the second 2D body joint position (14) from the generated first 2D body joint position (12); - determining (106) an error model (50) by estimating a statistical error value indicating a deviation (55) of the first 2D body joint position (12) from the second 2D body joint position data (14); - Determining (108) the 3D body joint position (20) for the at least one body joint point (10) on the basis of the first 2D body joint position (12) and the determined error model (50) by applying a statistical method.
Owner:ROBERT BOSCH GMBH
Source spacing determination method, system and equipment for density logging and storage medium
The invention discloses a spacing determination method, system and device for density logging and a storage medium, and belongs to the technical field of pulse radioactive source logging in oil-gas exploration. Comprising the following steps: establishing a stratum detection model by utilizing Monte Carlo simulation software; obtaining the relationship between the counting rate and the long source spacing and the relationship between the counting rate and the short source spacing through a stratum detection model, and preliminarily screening the value ranges of the long source spacing and the short source spacing; further screening the value ranges of the long spacing and the short spacing according to the statistical error and the measurement precision of the stratum detection model; and determining a final value range of the short spacing by using a short spacing compensation function and a sensitivity requirement. The method can quickly determine the value range of long spacing and short spacing, has higher accuracy, is reasonable, can help to improve the accuracy of density instrument data, obtains high-precision stratum density parameters, enables subsequent logging interpretation and analysis to be more accurate, and improves the accuracy of the density instrument data. And certain logging cost can be saved.
Owner:PETROCHINA CO LTD
Signal and data processing method of multi-base incoherent scatter radar
The invention belongs to the field of radio detection, particularly relates to a signal and data processing method for a multi-base incoherent scatter radar, and aims to solve the problem of failure of a conventional signal and data processing method for the multi-base incoherent scatter radar. The method comprises the following steps: dividing a detection distance range of a multi-base incoherent scatter radar beam into a plurality of detection distance doors, and calculating a signal autocorrelation function of each detection distance door; after time correction is carried out on the signal of the receiving station, an observation system equation constant is determined based on antenna gains of the transmitting station and the receiving station and the detection co-body height in combination with radar transmitting power; fitting the signal autocorrelation function according to the spectrum fuzzy function and the plasma scattering theory power spectrum function in combination with the observation system equation constant and the statistical error of the signal autocorrelation function, and performing inversion to obtain the ionosphere parameter of each detection range gate. The method is applied to a multi-base incoherent scattering radar, and an effective ionosphere multi-parameter result is obtained.
Owner:INSTITUTE OF GEOLOGY AND GEOPHYSICS CHINESE ACADEMY OF SCIENCES
A method and program product for dynamically controlling wellbore pressure in natural gas hydrate drilling
The present invention discloses a method and program product for dynamic control of wellbore pressure in natural gas hydrate drilling, which establishes an original matrix of observation parameters and an original matrix of state parameters, performs data normalization processing of hysteresis regression and missing completion on the observation parameters based on adjacent well and drilling data; combines dual gradient drilling technology to establish a dynamic control model of wellbore pressure in drilling; adopts a particle filter algorithm to predict state parameters, and uses statistical errors to evaluate the prediction effect; establishes dual constraints of drilling safety density window and overflow safety evaluation standard to verify the safety of state parameters, outputs data if the conditions are met, and updates the original matrix of state parameters to a sequence matrix of state parameters. The present invention can predict the wellbore pressure profile at any time during the natural gas hydrate drilling process, improves the calculation accuracy of multiphase flow under complex constraints, and can increase the maximum drilling depth of a single opening by optimizing the observation parameters, thereby ensuring safe and efficient drilling.
Owner:THE SECOND EXPLORATION TEAM OF SHANDONG COALFIELD GEOLOGY BUREAU
Wiring length determination method based on circuit board
ActiveCN119450944AImprove determination accuracyAvoid statistics errorsPrinted circuit aspectsCircuit artworks manufactureControl theoryReliability engineering
Owner:INSPUR SUZHOU INTELLIGENT TECH CO LTD
Dynamic frequency and voltage adjustment method, device, equipment, storage medium and program product
The application relates to a dynamic frequency and voltage adjustment method, device, equipment, storage medium and program product. The method comprises the following steps: determining the value of the utilization time length under the upper and lower limits of the utilization time length of a video decoder according to the current decoding information of the video decoder; the upper and lower limit conditions comprise a frame loss limit condition and a statistical error condition of the video decoder; and the dynamic frequency and voltage adjustment strategy parameters of the video decoder are determined according to the value of the utilization time length, and the dynamic frequency and voltage adjustment strategy parameters are used for dynamically adjusting the frequency and voltage of the video decoder. The method can more accurately dynamically adjust the frequency and voltage of the video decoder.
Owner:MOORE THREADS TECH CO LTD
A method and device for determining video compression quality
The present invention provides a method and device for determining the quality of video compression, the method comprising: calculating an error sequence based on the acquired original video picture and the compressed video picture; performing segmentation operation on the error sequence to obtain multiple subsequences; obtaining the statistical distribution of the error sequence based on the subsequences; and determining the quality of video compression based on the statistical distribution of the error sequence through an information entropy calculation formula. The present application uses a compression stability index for specific measurement, the better the stability, the better the video compression quality, and vice versa. Through the method provided by the present application, since a segmented batch processing method is used, the video file analysis consumption is small, and since the statistical error is low, the phase space of the data is converged during the statistical process, so that the data will be characterized relatively concentratedly within a fixed range, and the information entropy and other methods themselves have a certain stability, so the statistical results will be relatively limited to a level.
Owner:INDUSTRIAL AND COMMERCIAL BANK OF CHINA
A safety monitoring method for concrete dams based on coupling simulation and monitoring
The present invention provides a method for safety monitoring of concrete dams by coupling simulation and monitoring; first, a finite element mesh model of the dam is constructed according to the engineering structure design data, and the thermodynamic parameters of the dam concrete and bedrock are inverted using historical monitoring data. Secondly, the statistical error is determined based on the finite element calculation results and measured results of the historical deformation of the dam, and the first, second, and third level monitoring thresholds for dam safety monitoring are determined in combination with the deformation increment of the dam from normal operation to overload conditions. Thirdly, based on the calculated deformation value at a certain moment in the operation of the dam and the first, second, and third level monitoring thresholds, a hierarchical monitoring index at that moment is formulated. Finally, the safety monitoring status of the dam at that moment is determined based on the hierarchical monitoring index and the measured deformation value. The present invention can provide a theoretical and methodological basis for online monitoring of dams and the construction of digital twin projects.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
Grape yield and quality evaluation method and system based on image recognition
PendingCN121767981ACharacter and pattern recognitionManufacturing computing systemsPattern recognitionData set
The invention relates to the technical field of grape nondestructive testing, in particular to a grape yield and quality evaluation method and system based on image recognition, and the method comprises the steps of image data set acquisition and processing, model training and verification, model recognition and report output. Correcting the plane grain number in the image into an actual grain number through a linear regression model; the maturity of a single fruit grain is accurately identified through expert labeling; a variable coefficient is calculated through the coordinates of the fruit grains and the occupied pixel area and is used for judging the fruit grain uniformity of the grape bunch; the evaluation system is used for realizing the method, and seamless connection of the whole process from original image input to report generation is realized. According to the method, the problem that the existing actual grain number statistical error is large is solved, and meanwhile quantitative evaluation on the maturity and the uniformity is achieved; an algorithm model used by the evaluation system is simple in form, few in parameter, efficient in calculation and suitable for being deployed on lightweight computing equipment, and the requirements for practicability, robustness and generalizability of the method are met.
Owner:HANGZHOU YINGHE JIATIAN TECH CO LTD
Vehicle operation condition prediction method, device, equipment, medium and product
The invention discloses a vehicle operation condition prediction method, device and equipment, a medium and a product. The method comprises the following steps: acquiring sensor data and spatial positioning data of a vehicle, and constructing a space-time sequence tensor based on the sensor data and the spatial positioning data; inputting the space-time sequence tensor into a target prediction model to obtain a prediction output result; the prediction output result comprises an operation state identification result, a transportation task starting point and a transportation task ending point; and determining the running state of the vehicle according to the running state recognition result, and determining the transportation times of the vehicle according to the transportation task starting point and the transportation task ending point. According to the technical scheme of the invention, the method can solve the problems that the operation state of the mine card is difficult to recognize, the statistical error of the number of times is large, and the data is discontinuous due to the lack of GPS signals in the mine transportation operation, achieves the recognition of the operation state of the mine card, and automatically calculates the number of times of transportation every day.
Owner:SHANTUI CONSTR MASCH CO LTD
Natural gas hydrate drilling wellbore pressure dynamic control method and program product
ActiveCN119536388Aavoid missingImprove calculation accuracyConstructionsClimate change adaptationThermodynamicsWell drilling
The invention discloses a natural gas hydrate drilling wellbore pressure dynamic control method and a program product, and the method comprises the steps: building an observation parameter original matrix and a state parameter original matrix, and carrying out the data standardization processing of lagging regression and missing completion on observation parameters based on adjacent wells and while-drilling data; in combination with a double-gradient drilling technology, a drilling shaft pressure dynamic control model is established; predicting a state parameter by adopting a particle filtering algorithm, and evaluating a prediction effect by utilizing a statistical error; and establishing double constraint conditions of a drilling safety density window and an overflow safety evaluation standard, verifying the safety of the state parameters, if the conditions are met, outputting data, and updating the state parameter original matrix into a state parameter sequence matrix. According to the method, the wellbore pressure profile at any moment in the natural gas hydrate drilling process can be predicted, the calculation precision of multiphase flow under complex constraint conditions is improved, the maximum drilling depth of single drilling time can be increased by optimizing observation parameters, and safe and efficient drilling is guaranteed.
Owner:THE SECOND EXPLORATION TEAM OF SHANDONG COALFIELD GEOLOGY BUREAU
A matching system for interference waveform and positioning method thereof
The present invention discloses a matching system for interference waveforms and a positioning method thereof, including an interference waveform matching system, wherein the interference waveform matching system includes a data acquisition module, an IDS automatic module, an interference gene library module, a waveform matching core module, an application analysis module, and a work order flow module. The present invention automatically acquires interference data and automatically analyzes interference data with an integrated IDS module, thereby improving work efficiency and avoiding statistical errors. In addition, by constructing two core modules, an interference gene library and a waveform matching algorithm, typical waveforms of interference sources are set, and interference cells are quickly and accurately matched, thereby solving the problem of slow timeliness of interference positioning.
Owner:ZHOUKOU NORMAL UNIV
Method, systems, and computer programs for estimating a position and generating at least one protection level associated therewith
A navigation satellite system (NSS) receiver (10) and / or a processing entity receiving data from the NSS receiver (10) estimate a position and generate a protection level (PL) associated with the estimated position. A PL is a statistical error bound ensuring that the estimate only exceeds the PL with a probability, the "integrity risk". An integrity estimator (40) uses state variables and computes its values based on time-propagated, IMU-based data and timely NSS observations. It uses a position error history state variable set (410) representing estimated errors in a position of the NSS receiver (10) at epochs preceding an estimation epoch. A time-propagated, NSS-based estimated position and a time-propagated PL set are generated, for the estimation epoch, based on the position error history state variable set (410), an IMU-based estimated position, a delayed estimated position, and a delayed PL set. Systems and vehicles using such a method are also disclosed.
Owner:TRIMBLE INC
A method, system, and computer program product for evaluating the performance of diffractive optical elements based on measured morphology and simulation analysis.
This invention relates to a method, system, and computer program product for performance evaluation of diffractive optical elements based on measured morphology and simulation analysis. It pertains to the field of diffractive optical element design, testing, and performance evaluation technology, addressing the problem of existing technologies lacking effective analysis methods and evaluation models for diffractive optical elements. The method includes the following steps: Step S1, for a reflective phase mask, constructing a corresponding etching depth distribution based on the designed phase distribution; Step S2, based on the designed phase distribution, constructing a corresponding etching depth distribution and establishing a statistical error model; Step S3, measuring the actually processed diffractive optical element to obtain its surface three-dimensional morphology data and obtaining the actual processing error distribution; Step S4, based on the statistical error model described in Step S2 and the actual processing error distribution described in Step S3, constructing a light field propagation model; Step S5, based on the light field propagation model, performing performance analysis on the diffractive optical element.
Owner:CHANGGUANG SATELLITE TECH CO LTD
Low alloy steel impact energy intelligent prediction method based on transfer learning
The invention belongs to the technical field of impact toughness evaluation, and particularly relates to a low alloy steel impact energy intelligent prediction method based on transfer learning, which comprises the following steps: step 1, selecting an impact energy prediction position of a material, step 2, shooting a microstructure optical microscope image of a target position, and carrying out an impact toughness test. The method comprises the following steps of: 1, acquiring image data and impact energy data, 3, sorting the image data and the impact energy data, and dividing training and testing data sets, 4, building a transfer learning model, and completing model parameter adjustment and optimization selection, and 5, inputting an optical microscope image at any position, and realizing impact energy prediction. According to the low alloy steel impact energy intelligent prediction method based on transfer learning, the impact energy value prediction result can be obtained only by shooting the light microscope image of the concerned position and inputting the light microscope image as the prediction model, the manpower time cost and possible statistical errors caused by manual statistics of microstructure parameters are avoided, and intelligent impact energy prediction is achieved.
Owner:EAST CHINA UNIV OF SCI & TECH
Signal and data processing method for multi-base incoherent scatter radar
The application belongs to the field of radio detection, and particularly relates to a signal and data processing method of a multi-base incoherent scatter radar, and aims to solve the problem that the conventional signal and data processing method is invalid for the multi-base incoherent scatter radar. The application comprises: dividing the detection distance range of the multi-base incoherent scatter radar beam into multiple detection distance gates, and calculating the signal autocorrelation functions of the detection distance gates; after time correction of the signals at the receiving station, determining the observation system equation constant based on the antenna gains of the transmitting station and the receiving station, the detection common height, and the radar transmitting power; fitting the signal autocorrelation functions according to the spectral ambiguity function, the plasma scattering theory power spectrum function, the observation system equation constant and the statistical error of the signal autocorrelation functions, and inversely obtaining the ionospheric parameters of the detection distance gates. The application is applied to the multi-base incoherent scatter radar, and effective ionospheric multi-parameter results are obtained.
Owner:INSTITUTE OF GEOLOGY AND GEOPHYSICS CHINESE ACADEMY OF SCIENCES
Method, system and computer program for estimating location and generating protection level
The present invention relates to methods, systems, and computer programs for estimating a location and generating a protection level. A navigation satellite system (NSS) receiver (10) and / or a processing entity that receives data from the NSS receiver estimates a position and generates a protection level (PL) associated with the estimated position. PL is a statistical error limit that ensures that the estimated position exceeds the PL, i.e., the "integrity risk", only with a certain probability. The integrity estimator (40) uses the state variable and calculates its value based on IMU-based time propagation data and timely NSS observations. It uses a set of position error historical state variables (410) representing estimated position errors of the NSS receiver at epochs prior to the estimated epoch. NSS-based time propagation estimated positions and a set of time propagation PL are generated for the estimated epochs based on the set of position error history state variables, the IMU-based estimated positions, the delayed estimated positions, and the set of delayed PL. Systems and vehicles using such methods are also disclosed.
Owner:TRIMBLE NAVIGATION LTD