Date of Award
3-23-2017
Document Type
Thesis
Degree Name
Master of Science
Department
Department of Aeronautics and Astronautics
First Advisor
William E. Wiesel, PhD.
Abstract
As Low Earth Orbit (LEO) contains an ever-increasing number of objects, the prediction of future object positions must be precise in order to avoid collisions. Object positions are distributed in two-line element (TLE) sets and are generated using the analytical propagator known as Simplified General Perturbations 4 (SGP4). However, a numerical integrator called Special Perturbations (SP) provides an alternative approach to TLE generation and propagation. In this thesis, TLE accuracy was determined with both models, and the length of time that a single element set can provide valid information was also established. With two-line element sets as data, comparisons were made between the numerical integrator and the analytical model for objects in LEO, particularly the Hubble Space Telescope (HST). The results obtained indicated that the propagated position error using SGP4 remained within 1 km of the expected position during a 7 day period from the epoch of the initial element set. Additionally, the majority of comparisons between SGP4 and SP resulted in a higher error while using the numerical integrator, although some comparisons showed a lower propagated position error with SP. This final result shows a potential for SP to provide more accurate position information than SGP4 in future research.
AFIT Designator
AFIT-ENY-MS-17-M-286
DTIC Accession Number
AD1055362
Recommended Citation
Rich, Adam T., "Investigating Analytical and Numerical Methods to Predict Satellite Orbits Using Two-Line Element Sets" (2017). Theses and Dissertations. 1722.
https://scholar.afit.edu/etd/1722