Gomes, Vivian M.Kuga, Helio K.Chiaradia, Ana Paula M. [UNESP]2014-05-272014-05-272007-07-01Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 29, n. 3, p. 274-278, 2007.1678-58781806-3691http://hdl.handle.net/11449/69758This work analyses a real time orbit estimator using the raw navigation solution provided by GPS receivers. The estimation algorithm considers a Kalman filter with a rather simple orbit dynamic model and random walk modeling of the receiver clock bias and drift. Using the Topex/Poseidon satellite as test bed, characteristics of model truncation, sampling rates and degradation of the GPS receiver (Selective Availability) were analysed. Copyright © 2007 by ABCM.274-278engGPSKalman filterNavigation solutionOrbit determinationModel truncationOrbit estimatorAlgorithmsDynamic modelsGlobal positioning systemKalman filtersReal time systemsSignal receiversOrbitsArtigo10.1590/S1678-58782007000300006S1678-58782007000300006WOS:000255403600006Acesso aberto2-s2.0-362489533642-s2.0-36248953364.pdf