Study on measurement error of fiber space coordinate detection using an area CCD camera for the LAMOST positioning system

2008 ◽  
Author(s):  
Yi Jin ◽  
Xiaozheng Xing ◽  
Chao Zhai ◽  
Zengxiang Zhou
Keyword(s):  
Measurement Error ◽  
Ccd Camera ◽  
Positioning System ◽  
Fiber Space ◽  
Space Coordinate

The Application of Kalman Filtering on Vessel Positioning System

2012 ◽  
Vol 263-266 ◽  
pp. 501-505
Author(s):  
Xiong Dong Ding ◽  
Guang Qian Chu
Keyword(s):  
Measurement Error ◽  
Kalman Filtering ◽  
Measurement Errors ◽  
Positioning System ◽  
Location Accuracy ◽  
Wireless Location ◽  
Location System ◽  
The Subject ◽  
Channel Environment

In the ocean, due to the non-ideal channel environment, it is difficult to locate the position of the vessel in the sea quickly and exactly. In order to improve the location accuracy of accident vessel in the ocean, one method is to analyze the main cause of the different kinds of the measurement errors to find their solutions to decrease the errors. The subject that Kalman filtering technology is applied in wireless location system is researched in this paper, which can reduce the measurement error and greatly improve the location accuracy.

Accuracy of a Global Positioning System (GPS) for Weed Mapping

1997 ◽  
Vol 11 (4) ◽  
pp. 782-786 ◽  
Author(s):  
Theodore M. Webster ◽  
John Cardina
Keyword(s):  
Measurement Error ◽  
Global Positioning System ◽  
Patch Size ◽  
Positioning System ◽  
Weed Mapping ◽  
Global Positioning ◽  
The Relationship

Experiments were conducted to test the accuracy of a global positioning system (GPS) in measuring the area of simulated weed patches of varying size and to determine the accuracy in navigating back to particular points in a field. Circular areas of 5, 50, and 500 m2 were established and measured using point and polygon features of a GPS. The GPS estimations of the area of those patches had errors ranging from 7 to 45%, 6 to 15%, and 3 to 6%, respectively, when compared to actual measurements. As patch size increased, errors decreased. A curve describing the relationship between GPS error and patch size had an excellent fit (r2 = 0.92). The error remained the same in all measurements across all patch sizes, but composed a smaller percentage of large patches. The GPS had submeter accuracy in navigation to the correct quadrat 73% of the time, located the correct quadrat 27% of the time, and invariably navigated to within 1.58 m of the correct quadrat. The relationship between patch size and measurement error was applied to natural infestations of hemp dogbane.

A New Ellipse Recognition Algorithm for CCD Camera

2005 ◽  
Vol 295-296 ◽  
pp. 729-734 ◽  
Author(s):  
Chang Ku Sun ◽  
X. Zhang ◽  
Z. Wang ◽  
S. Ye
Keyword(s):  
Computer Vision ◽  
Camera Calibration ◽  
Ccd Camera ◽  
Recognition Algorithm ◽  
Calibration Error ◽  
3D Space ◽  
2D Pattern ◽  
Space Coordinate ◽  
Series Of Experiments ◽  
Computer Vision Applications

A novel 2D pattern used in camera calibration is presented. An array of circles with one feature circle located at the center is photo echoed on the pattern. According to the category of the pattern, an ellipse recognition algorithm is proposed. It facilitates acquisition of the distinguished points without human operation. The 3D space coordinate system of these points can be established automatically and accurately. A series of experiments show that the algorithm is robust and reliable. The calibration error is less than 0.4 pixels. The new ellipse recognition algorithm can be widely used for computer vision applications.

Improvement of distance measurement error by attenuation of ultrasonic transmitter and receiver signal for the ultrasonic positioning system

2018 ◽  
Vol 2018 (0) ◽  
pp. OS4-7
Author(s):  
Shunsuke Matsuoka ◽  
Hiromichi Ito ◽  
Shingo Takahashi ◽  
Takuma Moritani ◽  
Hideki Kawaguchi ◽  
...  
Keyword(s):  
Measurement Error ◽  
Distance Measurement ◽  
Positioning System ◽  
Ultrasonic Transmitter

scholarly journals Postprocessing of Infrared Reflectography to Support the Study of a Painting: The Case of Vivarini's Polyptych

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Laura Fragasso ◽  
Nicola Masini
Keyword(s):  
Principal Component Analysis ◽  
Spectral Sensitivity ◽  
Diagnostic Technique ◽  
Principal Component ◽  
Ccd Camera ◽  
Positioning System ◽  
Spectral Indices ◽  
Study Case ◽  
Infrared Reflectography ◽  
Ir Reflectography

Infrared (IR) reflectography is an imaging diagnostic technique widely used to study and evaluate the assessment of paintings' conservation state. The study case analyzed in this paper is related to a polyptych panel attributed to Vivarini's workshop conserved in the “Sigismondo Castromediano” Museum in Lecce. The painting's IR reflectography has been acquired through a CCD camera with spectral sensitivity ranging 400–1150 nm and manual positioning system. In order to offset the technological limits of the CCD camera, reflectograms have been processed through Principal Component Analysis and spectral indices. Postprocessing provided information related to the different pictorial drafting and restoration works, as well as emphasized graphic details and shadings, useful to improve the knowledge of the painting techniques.

scholarly journals Use of Global Positioning System velocity outputs for determining airspeed measurement error

2007 ◽  
Vol 111 (1120) ◽  
pp. 381-388 ◽  
Author(s):  
G. B. Gratton
Keyword(s):  
Measurement Error ◽  
Global Positioning System ◽  
Positioning System ◽  
Static System ◽  
Global Positioning

Abstract Several methods have been derived since the advent of GPS (Global Positioning System) receivers in aircraft cockpits by which these receivers may be used to calibrate these aircraft’s other instrumentation; in particular the pitot-static system. This paper presents the four most suitable methods, two of which have been developed by the author. These methods are shown with a common symbology, and their strengths, weaknesses, analysis and operational use are compared.

scholarly journals Measuring system for parallel moving ships

2012 ◽  
Vol 19 (Special) ◽  
pp. 66-72 ◽  
Author(s):  
Anna Waszkiel
Keyword(s):  
Vision System ◽  
Ccd Camera ◽  
Measuring System ◽  
Positioning System ◽  
The Real ◽  
Distance Calculation ◽  
Characteristic Points

ABSTRACT The paper introduces algorithm for determining the relative positions of two ships manoeuvring as a pair. This algorithm also takes into account determination of angle γ, which is difference between present approaching vessel and guidance vessel course. Relative positioning system is a vision system based on three colours LEDs matrix and rotating CCD camera. There are presented ways of distance calculation based on photogrammetric methods from the known distance between the characteristic points of the real. Several possible cases are taken into account. The considerations have been illustrated on the basis of model of the system. These results confirm the correctness of the operation of the algorithm that is used by the designed measuring system.

The influence of the setup shape of a portable UWB system’s antennas in sport

2021 ◽  
pp. 175433712110418
Author(s):  
José Pino-Ortega ◽  
Petrus Gantois ◽  
Amaia Méndez ◽  
Markel Rico-González
Keyword(s):  
Measurement Error ◽  
Wide Band ◽  
Static Condition ◽  
High Accuracy ◽  
Ultra Wide Band ◽  
Positioning System ◽  
Accurate Data ◽  
Retest Reliability ◽  
Test Retest Reliability ◽  
High Test

Ultra-wide band (UWB) technology has become one of the most promising technologies of the future. It seems that the positioning of the antenna set influences the accuracy of the player’s performance. This study was aimed to assess the influence of two different antenna positioning system shapes: (i) octagonal installation and (ii) circular installation. A UWB technology was used to track a healthy and well-trained athlete’s (age: 38 years, mass: 76.34 kg, and height: 1.75 m) positioning. Overall, the data measured showed high accuracy in both shape setups in all trajectories assessed in static and dynamic conditions for all speed thresholds. However, the distance covered during jogging and sprinting showed poor accuracy for both shape setups. Moreover, the data measured showed high test-retest reliability and inter-device agreement in the static condition, regardless of the antenna setup shape. In conclusion, both the octagonal and circular antenna setup shape provided accurate data, but the measurement error associated within the setup shape seemed slightly different between the two systems.

Brief summary of Kleť photographic search programme for minor planets

1999 ◽  
Vol 173 ◽  
pp. 189-192
Author(s):  
J. Tichá ◽  
M. Tichý ◽  
Z. Moravec
Keyword(s):  
Ccd Camera ◽  
Minor Planet ◽  
Minor Planets ◽  
Main Belt

AbstractA long-term photographic search programme for minor planets was begun at the Kleť Observatory at the end of seventies using a 0.63-m Maksutov telescope, but with insufficient respect for long-arc follow-up astrometry. More than two thousand provisional designations were given to new Kleť discoveries. Since 1993 targeted follow-up astrometry of Kleť candidates has been performed with a 0.57-m reflector equipped with a CCD camera, and reliable orbits for many previous Kleť discoveries have been determined. The photographic programme results in more than 350 numbered minor planets credited to Kleť, one of the world's most prolific discovery sites. Nearly 50 per cent of them were numbered as a consequence of CCD follow-up observations since 1994.This brief summary describes the results of this Kleť photographic minor planet survey between 1977 and 1996. The majority of the Kleť photographic discoveries are main belt asteroids, but two Amor type asteroids and one Trojan have been found.

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