Results 331 to 340 of about 7,723,935 (379)
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Accuracy of maxillary positioning in bimaxillary surgery
British Journal of Oral and Maxillofacial Surgery, 2009The aim of the study was to investigate the accuracy of a modified pin system for the vertical control of maxillary repositioning in bimaxillary osteotomies. The preoperative cephalograms of 239 consecutive patients who were to have bimaxillary osteotomies were superimposed on the postoperative films.
W B, Kretschmer +4 more
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Position Accuracy of Celestial Fixes
Journal of Navigation, 1994For centuries, celestial navigation was the main method of determining a ship's position at sea, especially when sailing into more exotic areas. Later on, vast areas of the oceans were only covered by the Omega system and there was still every opportunity of finding a position by using the sextant.
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Accuracy of GPS positioning over regional scales
Survey Review, 2009Abstract Recently, evaluation of GPS positioning accuracies has gained importance. Studies presented in this manner usually employ inter-station distances varying between 5 and 300 km. In this study, we aim to assess GPS accuracies over longer baselines (i.e. on smaller or regional scales) ranging from 300 to 3000 km. We adopted already published Least
ENGIN, Cetin, Sanli, Doğan Uğur
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GPS Marine Kinematic Positioning Accuracy and Reliability
The Canadian Surveyor, 1987Positioning accuracy and reliability are two parameters of major concern to GPS marine users. GPS limitations and error sources are analyzed from a user’s point of view. The coverage limitations inherent to the (18 + 3) satellite constellation are discussed and related outages inherent to specific geographical areas are described. Receiver and antenna
G. Lachapelle +5 more
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The International Journal of Advanced Manufacturing Technology, 2022
Haorong Wu +3 more
semanticscholar +1 more source
Haorong Wu +3 more
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LTE Positioning Accuracy Performance Evaluation
2015In this paper we investigate the positioning accuracy of user equipment (UE) with observed time difference of arrival (OTDoA) technique in Long Term Evolution (LTE) networks using dedicated positioning reference signal (PRS) by means of comprehensive simulation model.
Mstislav Sivers, Grigoriy Fokin
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High-accuracy positioning: astrometry
2013The limiting accuracy for measuring the location of an optical image is set by diffraction and photon noise, i.e., by the dual wave–particle nature of light. A theoretical expression for the limiting accuracy is derived under idealized conditions and generalized to take into account more realistic circumstances, such as additive noise and finite pixel ...
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Compass RDSS Positioning Accuracy Analysis
2014The RDSS service is an important component in the Compass system, which is accomplished by the GEO satellites with the restriction of known elevation. The RDSS observation model was deduced, and the positioning model was given with the elevation restriction. RDSS positioning tests were implemented with real observation data, the results were as follows:
Rui Guo +4 more
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Lunar Navigation Satellite System and Positioning Accuracy Evaluation
The International Technical Meeting of the The Institute of Navigation, 2022Masaya Murata, I. Kawano, S. Kogure
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