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Calibri 83ffff̙̙3f3fff3f3f33333f33333.TU Delft Repositoryg@n.uuidrepository linktitleauthorcontributorpublication yearabstract
subject topiclanguagepublication type publisherisbnissnpatent
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departmentresearch group programmeprojectcoordinates)uuid:f2c44a11f9f94caf9a715ee70637b6afDhttp://resolver.tudelft.nl/uuid:f2c44a11f9f94caf9a715ee70637b6afbImproving the GNSS attitude ambiguity success rate with the multivariate constrained LAMBDA method8Giorgi, G.; Teunissen, P.J.G.; Verhagen, S.; Buist, P.J.GNSS Attitude Determination is a valuable technique for the estimation of platform orientation. To achieve high accuracies on the angular estimations, the GNSS carrier phase data has to be used. These data are known to be affected by integer ambiguities, which must be correctly resolved in order to exploit the higher precision of the phase observables with respect to the GNSS code data. For a set of GNSS antennae rigidly mounted on a platform, a number of nonlinear geometrical constraints can be exploited for the purpose of strengthening the underlying observation model and subsequently improving the capacity of fixing the correct set of integer ambiguities. A multivariate constrained version of the LAMBDA method is presented and tested here.enconference paperSpringerAerospace EngineeringRemote Sensing)uuid:cd3ef1db955d4c7780887dbf78a8643aDhttp://resolver.tudelft.nl/uuid:cd3ef1db955d4c7780887dbf78a8643awMultiplatform Instantaneous GNSS Ambiguity Resolution for Triple and QuadrupleAntenna Configurations with Constraints8Buist, P.J.; Teunissen, P.J.G.; Giorgi, G.; Verhagen, S.Traditionally the relative positioning and attitude determination problem are treated as independent. In this contribution we will investigate the possibilities of using multiantenna (i.e., triple and quadruple) data, not only for attitude determination but also for relative positioning. The methods developed are rigorous and have the additional advantage that they improve ambiguity resolution on the unconstrained baseline(s) and the overall success rate of ambiguity resolution between a number of antennas.journal articleHindawi Publishing Corporation)uuid:965082d0fbbf40569d0840348a17965cDhttp://resolver.tudelft.nl/uuid:965082d0fbbf40569d0840348a17965cCInteger ambiguity resolution with nonlinear geometrical constraintsInteger ambiguity resolution is the key to obtain very accurate positioning solutions out of the GNSS observations. The Integer Least Squares (ILS) principle, a derivation of the leastsquares principle applied to a linear system of equations in which some of the unknowns are subject to an integer constraint,was demonstrated to be optimal among the class of admissible integer estimators. In this contribution it is shown how to embed into the functional model a set of nonlinear geometrical constraints, which arise when considering a set of antennae mounted on a rigid platform. A method to solve for the new model is presented and tested: it is shown that the strengthened underlying model leads to an improved capacity of fixing the correct integer ambiguities.7constrained methods; GNSS; integer ambiguity resolution
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