HR: 1340h
AN: G33A-0030    [Abstracts]
TI: Effect of Ocean Tide Models on the Precise Orbit Determination of Geodetic Satellites
AU: * Kubo-oka, T
EM: tkubooka@nict.go.jp
AF: Kashima Space Research Center, National Institute of Information and Communications Technology, Hirai 893-1, Kashima-shi, Ibaraki, 314-8501 Japan
AU: Matsumoto, K
EM: matumoto@miz.nao.ac.jp
AF: Mizusawa Astrogeodynamics Observatory, National Astronomical Observatory of Japan, Hoshigaoka-chou 2-12, Mizusawa-shi, Iwate, 023-0861 Japan
AU: Otsubo, T
EM: otsubo@nict.go.jp
AF: Kashima Space Research Center, National Institute of Information and Communications Technology, Hirai 893-1, Kashima-shi, Ibaraki, 314-8501 Japan
AU: Gotoh, T
EM: tara@nict.go.jp
AF: National Institute of Information and Communications Technology, Nukui kita-machi 4-2-1, Koganei-shi, Tokyo, 184-8795 Japan
AB: Several ocean tide models are tested with precise observation data of satellite laser ranging to geodetic satellites, Starlette and Stella. Four ocean models, NAO.99b, CSR 3.0 (standard model in IERS Conventions 2003), CSR 4.0, and GOT99.2b were implemented in our orbit analysis software "concerto ver. 4". NAO.99b model was developed by assimilating tidal solutions from TOPEX/POSEIDON altimeter data into hydrodynamical model. Eight constituents (M2, S2, K1, O1, N2, P1, K2, Q1) were taken into account in each ocean tide model. Moreover, eight additional constituents (M1, J1, OO1, 2N2, Mu2, Nu2, L2, T2) can be included in NAO.99b model. Effect of ocean tides on geopotential coefficients were computed to 20th order. SLR data to Starlette and Stella were divided into arcs of 7 days length and 52 arcs (Jan. 2 - Dec. 30, 2004) were analyzed. Using different ocean tide model, orbits of these satellites were determined and weighted rms of postfit residuals are compared. We found that the NAO.99b model with 16 constituents can reduce weighted rms of postfit residuals using to the level of about 6.0 cm (Starlette) and 9.6 cm (Stella). These values are about 3-5 % smaller compared to other ocean tide models.
DE: 1241 Satellite geodesy: technical issues (6994, 7969)
SC: Geodesy [G]
MN: Fall Meeting 2005