ILRS Fall 2005 Workshop 5 Oct 2005 Session

ILRS Fall 2005 Workshop, 5 Oct 2005 Session: Signal Processing 1100 -1230 900 -1030 Range bias vs Intensity 2005 (T Otsubo) Opening (G M Appleby) Thermal behaviour of LAGEOS-type CCRs High-Low Test: (G O Delle Monache) Tanegashima (T Uchimura; read by T Otsubo) Hollow Retroreflectors (D Arnold) Yarragadee (R Carman) L 1 “Spin” using k. Hz (D Kucharski) Zimmerwald (W Gurtner) (Zero-signature satellite (V Vasiliev) GA) Mt Stromlo (J Luck) ----More stations? Station dependent Co. M (G M Appleby) Discussion Co. M info on ILRS Website (G M Appleby) 1030 -1100 Tea

Session Targets, Signatures and Biases I and II 14 th International Laser Ranging Workshop, Thurs. 10 June 2004 ? ? ? Chairpersons: Contributors: G. M. Appleby (NERC, UK) and T. Otsubo (NICT, Japan) T. Uchimura (JAXA, Japan), Y. Fumin (SHAO, China), V. Vassiliev (IPIE, Russia), M. Lara (ROA, Spain), D. Arnold (US), M. Wilkinson (NERC, UK), V. Noyes (BAE, Australia), and chairpersons

Target design of new missions • • • Geostationary satellite ETS-8: # of photon = 1/100 of LAGEOS Very low orbiter Shenzhou-4: first Chinese reflector in space Nearly 1 -ccr response LARETS: almost no signature effect Dual-sphere satellite (METEOR 3 M-like): no signature at all! What orbit? Analytical orbit design tool for future missions Re-visiting non-gravitational force modelling for LAGEOS’ Signature and biases • Eliminate intensity-dependent biases contaminating geodetic parameters. • cm to mm high-low offset seen at Yarr and Hx (+Zimm and Mc. Donald). • k. Hz system at Graz seeing every CCR (like streak camera!) üIt is highly recommended that stations quantify the weak effect by carrying out test ranging to Ground target, Lageos, Ajisai and (say) Envisat during which return levels are switched in a controlled way between minimum and maximum return levels within the systems’ dynamic ranges. strong weak strong