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Byron Davis
(Advisor: Prof. Gunter)
will propose a doctoral thesis entitled,
The Improvement of Multi-Satellite Orbit Determination through the Incorporation of Intersatellite Ranging Observations
On
Wednesday, December 2 at 11:00 a.m.
Remote (https://gatech.webex.com/meet/bdavis70)
Abstract
For many satellite remote sensing and communications missions, particularly those involving a formation or constellation of satellites, having precise knowledge of the satellite’s position in both an absolute and relative sense is essential. However, the capabilities of Global Navigation Satellite System (GNSS) based precise orbit determination (POD) alone and a priori knowledge of orbital dynamics parameters may not be enough to support an application’s needs. In an effort to improve multi-satellite POD, this thesis seeks to make the following three contributions:
The GNSS+ISL POD and dynamics parameter estimation scheme is described and illustrated through a series of simulated case studies involving constellations of satellites in low Earth orbit (LEO). Models for simulating realistic clock error, phase center variations, and carrier phase/pseudorange GNSS observation error were derived directly from hardware experimentation. Other sources of measurement error and dynamics uncertainty were based on current best estimates and practices found in the literature to create a robust and realistic simulation environment. The precision of intersatellite ranging observations were also varied to represent different spacecraft platform capabilities, such as CubeSats. Simulations, POD, and parameter estimation were carried out using Mission Analysis, Operations, and Navigation Toolkit Environment (MONTE), which is the Jet Propulsion Laboratory’s signature astrodynamic analysis tool.
Committee
