International Service for the Geoid


Search in ISG Website




CoverNewton's Bulletin

Issue n. 3, January 2006   [pp. 71-82]

Outlier detection in CHAMP kinematic orbit data to be used in gravity field determination

C. Gruber

Download file


CHAMP orbit data have become available from dynamic, reduced dynamic and kinematic (purely geometric) approaches. All of them have been used in gravity field determination. However, the kinematic orbits enjoy higher acceptance since they do not employ any a-priori gravity field model. Unfortunately, kinematic orbits suffer from higher noise levels and outliers. Hence, improving kinematic orbits will directly influence the quality of the gravity field model. In this paper, a pre-processing strategy for kinematic orbit data will be presented. Based on orbit smoothing, outliers will be detected and excluded from further processing.