ERROR ASSESSMENT OF A LOW-BUDGET PRECISION ORBIT DETERMINATION PROGRAM FOR A LOW-EARTH-ORBIT SATELLITE USING GPS OBSERVATION DATA

摘要

The development of a low-budget, precision orbit determination (LBPOD) program for use on-board, low-Earth-orbit (LEO) satellites and its application to a particular satellite are described. The program utilizes the Global Positioning System (GPS). Non-differenced LEO-GPs pseudo range measurements are used. A batch filter is used to provide statistical best state estimates. Results obtained for the LEO satellite, CHAMP (Challenging Mini-satellite Payload), are compared with those obtained with a current reference level precision orbit Determination (POD) program. The final orbit was estimated ' within anticipated errors with nominal initial state. Results obtained using four different models for the satellite dynamics are compared.