국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Lunar Gravity Field Determination Using SELENE Same-Beam Differential VLBI Tracking Data
저자	Goossens, S.;; Matsumoto, K.;; Liu, Q.;; Kikuchi, F.;; Sato, K.;; Hanada, H.;; Ishihara, Y.;; Noda, H.;; Kawano, N.;; Namiki, N.;; Iwata, T.;; Lemoine, F. G.;; Rowlands, D. D.;; Harada, Y.;; Chen, M.
Keyword	CORRELATION;; GRAVITATIONAL FIELDS;; LUNAR GRAVITATION;; LUNAR PROSPECTOR;; ORBIT DETERMINATION;; PERFORMANCE PREDICTION;; SPHERICAL HARMONICS;; SUPERHIGH FREQUENCIES;; TOPOGRAPHY;; ULTRAHIGH FREQUENCIES;; VERY LONG BASE INTERFEROMETRY
URL	http://dx.doi.org/10.1007/s00190-010-0430-2
보고서번호	GSFC.JA.5447.2011
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	A lunar gravity field model up to degree and order 100 in spherical harmonics, named SGM 100i, has been determined from SELENE and historical tracking data, with an emphasis on using same-beam S-band differential VLBI data obtained in the SELENE mission between January 2008 and February 2009. Orbit consistency throughout the entire mission period of SELENE as determined from orbit overlaps for the two sub-satellites of SELENE involved in the VLBI tracking improved consistently from several hundreds of metres to several tens of metres by including differential VLBI data. Through orbits that are better determined, the gravity field model is also improved by including these data. Orbit determination performance for the new model shows improvements over earlier 100th degree and order models, especially for edge-on orbits over the deep far side. Lunar Prospector orbit determination shows an improvement of orbit consistency from I-day predictions for 2-day arcs of 6 m in a total sense, with most improvement in the along and cross-track directions. Data fit for the types and satellites involved is also improved. Formal errors for the lower degrees are smaller, and the new model also shows increased correlations with topography over the far side. The estimated value for the lunar GM for this model equals 4902.80080 +/- 0.0009 cu km/sq s ྪ sigma). The lunar degree 2 potential Love number k2 was also estimated, and has a value of 0.0255 +/- 0.0016 ྪ sigma as well).