scholarly journals High-precision GPS measurement method without geographical restrictions using crowd-sensing technology

2021 ◽  
Vol 24 (4) ◽  
pp. 491-497
Author(s):  
Yunxiang Zhang ◽  
Bin Wang ◽  
Lei Zhang
Keyword(s):  
High Precision ◽  
Measurement Method ◽  
Geographical Location ◽  
Google Earth ◽  
Regular Hexagon ◽  
High Precision Measurement ◽  
Deployment Strategy ◽  
Crowd Sensing ◽  
Sensing Technology ◽  
Gps Measurement

In order to improve the flexibility of GPS measurement, a high-precision GPS measurement method that is not restricted by the geographical location under crowd-sensing technology was proposed. The performance of the crowdsensing network was improved through a regular hexagon-based crowd-smart big data sensing network deployment mechanism. The GPS /SINS/DR fast and high-precision combined measurement methods were used to achieve high-precision measurement without geographical restrictions. It has been verified that the proposed method in this paper has much better stability in the deployment strategy of a regular hexagon than that of the square. The proposed method can achieve fast acquisition of satellite signals and high-precision positioning, and its measurement accuracy in the low-latitude city and high-latitude city is higher than the online measurement method based on Google Earth, indicating that it has significant application value.

Error Compensation Technology of Semi-Strapdown MEMS Inertial Measurement System

2014 ◽  
Vol 609-610 ◽  
pp. 1213-1218 ◽  
Author(s):  
Jie Li ◽  
Jing De Zhu ◽  
Li Peng Hou ◽  
Jun Liu
Keyword(s):  
High Precision ◽  
Error Compensation ◽  
High Speed ◽  
Measurement Method ◽  
Motor Speed ◽  
High Precision Measurement ◽  
Inertial Measurement ◽  
Force Equation ◽  
Speed Fluctuation ◽  
Set Up

Semi-strapdown inertial measurement method provides a new solution for the high-precision measurement on flight attitude of high-spinning ammunition, while the specific set of components in the semi-strapdown application will cause a series of errors. This paper mainly analyzes the generation mechanism of motor speed fluctuation error and the misalignment error in coupling axis. Then the instantaneous motor speed measurement method based on the high-precision gyroscope is designed and the misalign model of coupling axis is set up, MEMS inertial measurement area centripetal force equation under the condition of high speed is worked out, and accuracy error parameters affecting the measurement are obtained. Finally, the paper provides corresponding error compensation method and comparative tests are conducted. The results show that the compensated system improves the accuracy of attitude angle calculating and the error has been effectively suppressed.

Two-dimensional high-precision non-contact automatic measurement method based on image corner coordinates

2021 ◽  
pp. 095440622098112
Author(s):  
Maoyue Li ◽  
Yonghao Xu ◽  
Zengtao Chen ◽  
Kangsheng Ma ◽  
Lifei Liu
Keyword(s):  
High Precision ◽  
Measurement Method ◽  
Low Cost ◽  
Automatic Measurement ◽  
Detection Algorithm ◽  
Contour Detection ◽  
Two Dimensional ◽  
High Precision Measurement ◽  
Standard Size ◽  
Actual Size

Aiming at some shortcomings of the existing non-contact two-dimensional high-precision measurement methods, this paper proposes a two-dimensional high-precision non-contact automatic measurement method based on the corner coordinates of the image. Firstly, this paper designs a set of simple image acquisition device and explains the advantages of the Canny operator used in the image contour detection algorithm. Subsequently, this paper proposes a dimension calibration algorithm based on image corner coordinates, which can convert the pixel size to the actual size, and achieves the function of the algorithm by hierarchical, multi-step processing of the image. Finally, in order to realize the intelligent positioning and selection of the standard size workpiece position, an automatic measurement and positioning system is designed, which can convert the actual size signal into the pulse time control signal. The experimental results show that the measurement method proposed in this paper has the advantages of fast measurement speed, high robustness, low cost and high degree of automation. When using a black-and-white checkerboard paper with an accuracy of 0.1 mm, the measurement accuracy can reach the micron level.

scholarly journals A low-cost high-precision measurement method of string motion

2014 ◽  
Vol 333 (17) ◽  
pp. 3881-3888 ◽  
Author(s):  
J.-L. Le Carrou ◽  
D. Chadefaux ◽  
L. Seydoux ◽  
B. Fabre
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Measurement Method ◽  
Low Cost ◽  
High Precision Measurement
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