scholarly journals Accuracy analysis and verification of the method for calculation of geodetic problem on earth ellipsoid surface

2021 ◽  
Vol 245 ◽  
pp. 02033
Author(s):  
Jian Dong ◽  
Hongchao Ji ◽  
Lulu Tang ◽  
Rencan Peng ◽  
Zhiqiang Zhang
Keyword(s):  
High Precision ◽  
Experimental Verification ◽  
Problem Solution ◽  
Accuracy Analysis ◽  
Basic Premise ◽  
Verification Scheme ◽  
Distance Calculation ◽  
Problem Method ◽  
Solution Methods ◽  
Coefficient Method

The method for calculation of geodetic problem on earth ellipsoid surface is the basic premise for the realization of high-precision marine delimitation technology. Based on the analysis of the construction principle of the existing solution of geodetic problem method, the algorithm for direct geodetic problem solution(DGPS) based on nested coefficient method and Bessel’s inverse geodetic problem solution(IGPS), which are suitable for various distance solutions, are optimized. Then, the experimental verification scheme of the solution of geodetic problem is designed. Finally, the crossing and reducing accuracy of different calculation examples are verified by different geodetic problem solution methods, and the experiment shows that: the verified accuracy of point-position plotting, distance calculation and azimuth calculation meet the requirements of the indexes of high-precision marine delimitation.

Development of Fiber Optic Current Sensor

2014 ◽  
Vol 1040 ◽  
pp. 954-958
Author(s):  
Mikhail G. Grigoriev ◽  
Nikita V. Turushev
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Faraday Effect ◽  
Fiber Optic ◽  
Precision Measurements ◽  
Current Sensor ◽  
Accuracy Analysis ◽  
High Precision Measurement ◽  
Modern Engineering ◽  
Current Measuring

Current measuring high-precision methods and devices are one of the most important modern engineering development lines in optimal energy consumption sphere. However, there are a few small-sized instruments which allow conducting precision measurements without breaking the circuit. This paper presents information about conducted Faraday Effect research and general construction of the simple fiber optic current sensor (FOCS). Researched sensor conception is used in prototype which is developing by team of laboratory number 63 of National Research Tomsk Polytechnic University Nondestructive Testing Institute. Required tests and accuracy analysis were conducted. Research results confirm that fiber optic current sensors provide high-precision measurement and proposed methodic is effective.

Researches on Diameter Automatic Measurement Device of Artillery Gun Tube

2012 ◽  
Vol 479-481 ◽  
pp. 1655-1659
Author(s):  
Wei Shi ◽  
Xiao Juan Wang ◽  
Shao Qing Ren ◽  
Jian Guo Wang
Keyword(s):  
High Precision ◽  
Experimental Verification ◽  
Automatic Measurement ◽  
The Other ◽  
Automatic Measuring ◽  
Measurement Device ◽  
Important Indicator ◽  
Measuring Device ◽  
Detection Technology ◽  
Automatic Measuring Device

The powder chamber of cannon gun tube was an important indicator which affected gun performance. The accuracy of fire, precision and the other technical indexes were inevitably affected by the chamber geometry parameters directly or indirectly. So the detection of cannon gun tube was an important part in the whole gun detection technology. This paper introduced the structure and the measuring principle about diameter automatic measurement device of cannon gun tube and made a prototype. Then the experimental verification was carried out. The experimental results showed that the automatic measuring device had the advantages of simple principle, convenient operation, high precision, and had a certain popularization value in use.

Further Studies of Nonverbal Learning and Aphasia

1963 ◽  
Vol 6 (4) ◽  
pp. 329-337 ◽  
Author(s):  
Ronald S. Tikofsky ◽  
Gale L. Reynolds
Keyword(s):  
Sorting Task ◽  
Problem Solution ◽  
Card Sorting ◽  
Perseverative Error ◽  
Card Sorting Task ◽  
Wisconsin Card Sorting Task ◽  
Nonverbal Learning ◽  
Solution Methods ◽  
Wisconsin Card Sorting ◽  
Order Of Presentation

This research study follows a previous paper on the performance of adult aphasics tested with a modified form of the Wisconsin Card Sorting Task. It investigates the effects of varying the order of presentation of the three sorting concepts or problems on the overall task-learning rate, the percentage of error responses and the percentage of perseverative error. It is found that varying the order of the concepts does not effect the task difficulty, as measured by these indices. Statistical and interpretative analyses of the data also investigate the nature of performance improvement patterns. It is found that any significant improvement is due to the elimination of nonperseverative errors, while the proportion of perseverative responses remains fairly constant. The aphasics' inability to generalize problem solution methods and possible techniques for reducing perseveration, in addition to an evaluation of this task as an aphasia research instrument, are discussed.

Experimental verification of transmitting-receiving registration method with high precision used in multi-beam lidar

2017 ◽  
Vol 46 (7) ◽  
pp. 730001
Author(s):  
李 铭 Li Ming ◽  
候 佳 Hou Jia ◽  
周成林 Zhou Chenglin ◽  
舒 嵘 Shu Rong
Keyword(s):  
High Precision ◽  
Experimental Verification ◽  
Registration Method

scholarly journals Estimating trajectories of meteors: an observational Monte Carlo approach – I. Theory

2019 ◽  
Vol 491 (2) ◽  
pp. 2688-2705 ◽  
Author(s):  
Denis Vida ◽  
Peter S Gural ◽  
Peter G Brown ◽  
Margaret Campbell-Brown ◽  
Paul Wiegert
Keyword(s):  
High Precision ◽  
Estimation Method ◽  
Optical Measurements ◽  
Estimation Methods ◽  
Comparative Performance ◽  
Trajectory Estimation ◽  
Wide Range ◽  
Solution Methods ◽  
Optimization Function ◽  
Systematic Biases

ABSTRACT It has recently been shown by Egal et al. that some types of existing meteor in-atmosphere trajectory estimation methods may be less accurate than others, particularly when applied to high-precision optical measurements. The comparative performance of trajectory solution methods has previously only been examined for a small number of cases. Besides the radiant, orbital accuracy depends on the estimation of pre-atmosphere velocities, which have both random and systematic biases. Thus, it is critical to understand the uncertainty in velocity measurement inherent to each trajectory estimation method. In this first of a series of two papers, we introduce a novel meteor trajectory estimation method that uses the observed dynamics of meteors across stations as a global optimization function and that does not require either a theoretical or an empirical flight model to solve for velocity. We also develop a 3D observational meteor trajectory simulator that uses a meteor ablation model to replicate the dynamics of meteoroid flight, as a means to validate different trajectory solvers. We both test this new method and compare it to other methods, using synthetic meteors from three major showers spanning a wide range of velocities and geometries (Draconids, Geminids, and Perseids). We determine which meteor trajectory solving algorithm performs better for all-sky, moderate field-of-view, and high-precision narrow-field optical meteor detection systems. The results are presented in the second paper in this series. Finally, we give detailed equations for estimating meteor trajectories and analytically computing meteoroid orbits, and provide the python code of the methodology as open-source software.

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