HR: 0800h
AN: G31B-0794    [Abstracts]
TI: Alternative ITRF Combination Formulation Based on the Strength of Different Space Geodesy Techniques
AU: Iz, H B
EM: lshbiz@polyu.edu.hk
AF: The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 852 Hong Kong
AU: * Fok, H S
EM: lsgidick@polyu.edu.hk
AF: The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 852 Hong Kong
AB: The evolution of space geodesy techniques (e.g. SLR, VLBI, GPS, DORIS) and their contribution to the reference frame realization has a marked impact on the geophysical and geodetic research over the past decade. Most of these studies rely on the International Terrestrial Reference Frame (ITRF) which is defined as a combination of each individual solution of space geodesy techniques that defines its own terrestrial reference frame (TRF). In this process, it is desirable that each of the techniques should contribute to the ITRF realization with independent geodetic information as well as in those areas where they provide the best available geodetic measurement. However, the current ITRF combination model does not differentiate explicitly the strength of each technique and the independence of the geodetic information they provide. The objective of this presentation is to demonstrate an alternative ITRF combination model formulation which takes into consideration the inherent properties of SLR which is sensitive to the center of mass variations of the Earth, VLBI which provides accurate earth orientation information and GPS which generates accurate scale through baseline measurements. This study also investigates and quantifies the impact of the new formulation on the realization of ITRF.
DE: 1200 GEODESY AND GRAVITY
DE: 1229 Reference systems
DE: 1243 Space geodetic surveys
DE: 1247 Terrestrial reference systems
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting