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Mostrando ítems 1-10 de 2045
Accuracy assessment of Precise Point Positioning with multi-constellation GNSS data under ionospheric scintillation effects
(2018-01-01)
GPS and GLONASS are currently the Global Navigation Satellite Systems (GNSS) with full operational capacity. The integration of GPS, GLONASS and future GNSS constellations can provide better accuracy and more reliability ...
Synthesis of Planar Multiloop Linkages Starting from Existing Parts or Mechanisms: Enumeration and Initial Sizing
(Taylor & Francis, 2008-12)
We present a methodology for dealing with mechanism synthesis problems in which the initial parts to move can have the form of either open-, closed-, or mixed-chain mechanisms, isolated points, or bodies to guide. We use ...
Evaluation of Three Methods to Estimate Density and Detectability From Roadside Point Counts
(Universidad Nacional, Costa Rica., 2011)
Roadside point counts are often used to estimate trends of bird populations. The use of aural
counts of birds without adjustment for detection probability, however, can lead to incorrect population trend
estimates. We ...
A Novel Approach to Improve GNSS Precise Point Positioning during Strong Ionospheric Scintillation: Theory and Demonstration
(2019-05-01)
At equatorial latitudes, ionospheric scintillation is the major limitation in achieving high-accuracy GNSS positioning. This is because scintillation affects the tracking ability of GNSS receivers causing losses of lock ...
Precise determination of quantum critical points by the violation of the entropic area law
(AMER PHYSICAL SOC, 2011)
Finite-size scaling analysis turns out to be a powerful tool to calculate the phase diagram as well as the critical properties of two-dimensional classical statistical mechanics models and quantum Hamiltonians in one ...
Characterizing the astrometric precision limit for moving targets observed with digital-array detectors
(2017)
Aims. We investigate the maximum astrometric precision that can be reached on moving targets observed with digital-sensor arrays, and provide an estimate for its ultimate lower limit based on the Cramer-Rao bound. Methods. ...
The economic feasibility of precision agriculture in Mato Grosso do Sul State, Brazil: a case study
(Precision Agriculture, 2018)
Estudo comparativo de métodos para calcular pontos ionosféricos e descrever o trajeto do sinal GNSS
(2017-01-01)
Many efforts have been done in the last decades to improve the formulation of ionospheric models based on data derived from the Global Navigation Satellite System (GNSS). Despite significant improvements in estimating the ...
Atualização da rede GPS de São Carlos e a avaliação do método "PPP" em comparação com o ajustamento de redes geodésicas
(Universidade Federal de São CarlosBRUFSCarPrograma de Pós-Graduação em Engenharia Urbana - PPGEU, 2007-12-20)
Atulim (2002) and Racanicchi (2003) had planned and implemented a geodetic GPS network in São Carlos city, which needed maintenance and revision. The proposals of this dissertation had consisted of: i) to bring up to date ...
Análise de séries temporais de coordenadas estimadas com GPS: Uma proposta metodológica para detecção, remoção e recuperação de efeitos sazonais
(2010-04-14)
GPS active networks are more and more used in geodetic surveying and scientific experiments, as water vapor monitoring in the atmosphere and lithosphere plate movement. Among the methods of GPS positioning, Precise Point ...