Searched for: +
(1 - 20 of 64)

Pages

document
Bartels, G.A. (author)
report 1995
document
Van Nee, D.J.R. (author)
doctoral thesis 1995
document
Jin, X.X. (author)
doctoral thesis 1996
document
Bartels, G.A. (author)
book 1997
document
Visser, P.N.A.M. (author), Van den IJssel, J. (author)
The computation of high-accuracy orbits is a prerequisite for the success of Low Earth Orbiter (LEO) missions such as CHAMP, GRACE and GOCE. The mission objectives of these satellites cannot be reached without computing orbits with an accuracy at the few cm level. Such a level of accuracy might be achieved with the techniques of reduced-dynamic...
journal article 2003
document
Da Silva Fernandes, R.M. (author)
doctoral thesis 2004
document
Kusche, J. (author), Schrama, E.J.O. (author)
Monitoring hydrological redistributions through their integrated gravitational effect is the primary aim of the Gravity Recovery and Climate Experiment (GRACE) mission. Time?variable gravity data from GRACE can be uniquely inverted to hydrology, since mass transfers located at or near the Earth's surface are much larger on shorter timescales...
journal article 2005
document
The upcoming GNSS Galileo, with its new satellite geometry and frequency plan, will not only bring many benefits for navigation and positioning but also help to improve ionosphere delay estimation. This paper investigates ionosphere estimation with Galileo and compares it with the results from GPS-only and combined GPS-Galileo. The standard...
journal article 2006
document
Socquet, A. (author), Simons, W.J.F. (author), Vigny, C. (author), McCaffrey, R. (author), Subarya, C. (author), Sarsito, D. (author), Ambrosius, B. (author), Spakman, W. (author)
The island of Sulawesi, eastern Indonesia, is located within the triple junction of the Australian, Philippine, and Sunda plates and accommodates the convergence of continental fragments with the Sunda margin. We quantify the kinematics of Sulawesi by modeling GPS velocities and earthquake slip vectors as a combination of rigid block rotations...
journal article 2006
document
Schrama, E.J.O. (author), Visser, P.N.A.M. (author)
journal article 2007
document
Bos, M.S. (author), Fernandes, R.M.S. (author), Williams, S.D.P. (author), Bastos, L. (author)
It has been generally accepted that the noise in continuous GPS observations can be well described by a power-law plus white noise model. Using maximum likelihood estimation (MLE) the numerical values of the noise model can be estimated. Current methods require calculating the data covariance matrix and inverting it, which is a significant...
journal article 2007
document
Schrama, E.J.O. (author), Wouters, B. (author), Lavallée, D.A. (author)
The Gravity Recovery and Climate Experiment (GRACE) product used for this study consists of 43 monthly potential coefficient sets released by the GRACE science team which are used to generate surface mass thickness grids expressed as equivalent water heights (EQWHs). We optimized both the smoothing radius and the level of approximation by...
journal article 2007
document
Odijk, D. (author), Teunissen, P.J.G. (author)
Successful carrier phase ambiguity resolution is the key to high-precision positioning with Global Navigation Satellite Systems (GNSS). The ambiguity dilution of precision (ADOP) is a well-known scalar measure which can be used to infer the strength of the GNSS model for carrier phase ambiguity resolution. In this contribution we present...
journal article 2008
document
De Bakker, P.F. (author), Van der Marel, H. (author), Tiberius, C.C.J.M. (author)
This paper demonstrates a geometry-free GNSS measurement analysis approach and presents results of single frequency GPS, EGNOS and GIOVE short and zero baseline measurements. The purpose is to separate the different contributions to the measurement noise of pseudo range code and carrier phase observations at the receiver. The influence of...
journal article 2009
document
D'Amico, S. (author)
Formation flying is commonly identified as the collective usage of two or more cooperative spacecraft to exercise the function of a single monolithic virtual instrument. The distribution of tasks and payloads among fleets of coordinated smaller satellites offers the possibility to overcome the classical limitations of traditional single...
doctoral thesis 2010
document
King, M.A. (author), Altamimi, Z. (author), Boehm, J. (author), Bos, M. (author), Dach, R. (author), Elosegui, P. (author), Fund, F. (author), Hernández-Pajares, M. (author), Lavallee, D. (author), Riva, E.M. (author)
The provision of accurate models of Glacial Isostatic Adjustment (GIA) is presently a priority need in climate studies, largely due to the potential of the Gravity Recovery and Climate Experiment (GRACE) data to be used to determine accurate and continent-wide assessments of ice mass change and hydrology. However, modelled GIA is uncertain due...
journal article 2010
document
Carrasco-Martos, S. (author), López-Risueño, G. (author), Jiménez-Baños, D. (author), Gill, E.K.A. (author)
Global Navigation Satellite System (GNSS) positioning has turned out to be an enabler of Location-Based Services (LBS). This has motivated in recent years an increasing research activity on signal processing techniques for GNSS receivers. However, one main limitation faced by these GNSS receivers is the propagation of GNSS signals in complex...
conference paper 2010
document
Gill, E.K.A. (author), Helderweirt, A. (author)
This paper presents a preliminary analysis of a novel Search and Rescue (SAR) based emergency system for Low Earth Orbit (LEO) satellites using the Galileo Global Navigation Satellite System (GNSS). It starts with a description of the space user SAR system including a concept description, mission architecture and legal and regulatory aspects....
conference paper 2010
document
Lavallée, D.A. (author), Moore, P. (author), Clarke, P.J. (author), Petrie, E.J. (author), Van Dam, T. (author), King, M.A. (author)
Changes in J2, resulting from past and present changes in Earth's climate, are traditionally observed by Satellite Laser ranging (SLR). Assuming an elastic Earth, it is possible to infer changes in J2 from changes in Earth's shape observed by GPS. We compare estimates of non-secular J2 changes from GPS, SLR, GRACE, and a load model. The GPS and...
journal article 2010
document
Van Helleputte, T. (author)
This dissertation describes the integration of accelerometer measurements of LEO-satellites in GPS-based orbit determination.
doctoral thesis 2011
Searched for: +
(1 - 20 of 64)

Pages