Thesis Type: Post Graduate
Institution Of The Thesis: Middle East Technical University, Graduate School of Natural and Applied Sciences, Havacılık ve Uzay Mühendisliği Bölümü, Turkey
Approval Date: 2019
Thesis Language: English
Student: ABDULKADİR KÖKER
Consultant: Ozan TekinalpAbstract:
In this thesis, the batch and sequential orbit determination procedures for the geostationary satellites are presented. The aim of the study is to investigate the effect of the angle only and standard angle-range measurements on orbit determination accuracy. The effect of various factors on estimation accuracy such as measurement frequency, observation duration, and number of observation sites are investigated using the simulated measurement data. Estimation methods namely, nonlinear least square, extended and unscented Kalman filters are employed and compared. In angle-only estimation, only sequential methods are applied to the simulated angular measurements in order to estimate the position and velocity vectors of a GEO satellite. In standard orbit determination, batch and sequential methods are investigated separately by using both angle and range measurements. The estimation results obtained from simulations for both methods are compared. Finally, the developed batch orbit determination algorithm is compared with the reference software used at TURKSAT ground stations. It is shown that the batch software developed performs as good as if not better than the reference software.