By Ole B. Andersen, P. Knudsen, P. A. M. Berry, E. L. Mathers, R. Trimmer, S. Kenyon (auth.), Professor Christopher Jekeli, Dr. Luisa Bastos, Professor Joana Fernandes (eds.)
ISBN-10: 3540269304
ISBN-13: 9783540269304
ISBN-10: 3540269320
ISBN-13: 9783540269328
The lAG overseas Symposium on Gravity, Geoid, and area Missions 2004 (GGSM2004) was once lield within the appealing urban of Porto, Portugal, from 30 August to three September 2004. This symposium encompassed the topics of fee 2 (Gravity box) of the newly dependent lAG, in addition to interdisciplinary themes regarding geoid and gravity modeling, with detailed cognizance given to the present and deliberate gravi- devoted satellite tv for pc missions. The symposium additionally within the culture of mid-term conferences that have been held among the quadrennial joint conferences of the overseas Geoid and Gravity Commissions. the former mid-term conferences have been the foreign Symposia on Gravity, Geoid, and Marine Geodesy (Tokyo, 1996), and Gravity, Geoid, and Geodynamics (Banff, 2000). GGSM2004 aimed to assemble scientists from various components within the geosciences, operating with gravity and geoid comparable difficulties, either from the theoretical and functional issues of view. issues of curiosity integrated the mixing of heterogeneous info and contributions from satellite tv for pc and airborne concepts to the examine of the spatial and temporal adaptations of the gravity box. as well as the specific concentrate on the CHAMP, GRACE, and GOCE satellite tv for pc missions, consciousness used to be additionally directed towards initiatives addressing topographic and ice box mapping utilizing SAR, LIDAR, and laser altimetry, in addition to missions and reports concerning planetary geodesy.
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Additional resources for Gravity, Geoid and Space Missions: GGSM 2004 IAG International Symposium Porto, Portugal August 30 – September 3, 2004
Example text
3 Analytical Solution of the HE Studying the J2 disturbing force in the Hill frame (6), both the along-track and radial direction forces have a two cycle per revolution (CPR) frequency component (a sinusoid function of 2u), whereas, the force in the cross-track direction is at the orbital frequency. We decompose the different force components and get the following non-homogeneous HE: (9) X + 2nz = Ax cos 2nt + Bx sin 2nt + Cx y + n^y = Ay cos nt + By sin nt + Cy z — 2nx — Sn^z = A^ cos 2nt + B^ sin 2nt -f- Cz (14) The orbits of the chief Vc and deputy r^ satellites are obtained respectively by numerical integration of (9).
Iterated MINQUE is known to converge faster towards unbiased estimates. More information on both estimators can be found in Rao and Kleffe (1988). MCVCE, a fast Monte Carlo implementation of iterative maximum-likelihood VCE along theses lines has been developed in Koch and Kusche (2002), Kusche (2003), and tested in Kusche and van Loon (2004) on real CHAMP data. Mayer-Giirr et al (in press) used it for deriving the ITG-CHAMPOl gravity model series. We develop here for the first time a Monte Carlo variant of the MINQUE technique.
3: outliers removed, equal weighting. • Sol. 4: outliers removed, MCVCE weighting. , 1998). In the computations of solutions 1 and 3, this was achieved using equal weights for each normal matrix. In the computations of solutions 2 and 4, use was made of MCVCE to estimate the weights of the normal matrices. 439 for data groups 1,2,3 and 4 resp. 216. This is equivalent to an increase of the standard deviations by a factor ^ 2. Similar weights were found in the computation of solution 2. Fig. 2 Comparison between the weights computed with MCVCE and with MCMINQUE with all outliers present.
Gravity, Geoid and Space Missions: GGSM 2004 IAG International Symposium Porto, Portugal August 30 – September 3, 2004 by Ole B. Andersen, P. Knudsen, P. A. M. Berry, E. L. Mathers, R. Trimmer, S. Kenyon (auth.), Professor Christopher Jekeli, Dr. Luisa Bastos, Professor Joana Fernandes (eds.)
by Michael
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