1. Semi-Analytic Approach to Rapid Orbit Determination for the Perturbed Two-Body Problem Open Access Author: Cope, Erin Title: Semi-Analytic Approach to Rapid Orbit Determination for the Perturbed Two-Body Problem Graduate Program: Aerospace Engineering (MS) Keywords: orbit determinationgeneral perturbation theoryNORAD ElementsAstrodynamicsConjugate unscented transformstatistical linearizationnonlinear least squares File: Download Cope_PSU_Thesis_final.pdf Committee Members: Amy Pritchett, Program Head/ChairPuneet Singla, Thesis Advisor/Co-AdvisorRoshan Thomas Eapen, Committee MemberRobert G. Melton, Committee Member