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Relative Navigation for the Hubble Servicing Mission using Reflected GPS Signals

dc.contributor.advisorSanner, Robert Men_US
dc.contributor.authorCohen, Ian Ravien_US
dc.description.abstractAutonomous rendezvous and docking is an important research area within the new exploration missions called forth by NASA. Relative navigation requires special sensors and algorithms to provide the necessary information. It may be possible to use reflected GPS signals as a source of ``free'' relative navigation measurements. Thus requiring no additional hardware except added algorithmic complexity. This thesis examines the use of an extended Kalman filter with reflected GPS measurements as a form of bi-static radar. It compares two different types of dynamic models, an absolute orbit model versus Hill's equations. The scenarios were implemented in Matlab using Satellite Toolkit to generate a high fidelity truth model. The thesis also examines visibility of reflected signals in a typical Hubble rendezvous scenario. This is done by approximating the Hubble as a cylinder, and using geometric optics to predict the reflective pattern.en_US
dc.format.extent11209451 bytes
dc.titleRelative Navigation for the Hubble Servicing Mission using Reflected GPS Signalsen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentAerospace Engineeringen_US
dc.subject.pqcontrolledEngineering, Aerospaceen_US
dc.subject.pquncontrolledRelative Navigationen_US
dc.subject.pquncontrolledReflected GPSen_US
dc.subject.pquncontrolledBi-static Radar;en_US

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