Development of Navigation Solution for NPSAT1
Leopold, Philipp Clemens
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The thesis develops a Navigation Solution for NPSAT1 based on a new approach.The necessary orbit determination, which is normally done by NORAD with high precision laser measurements, is directly implemented in NPSAT1.The GPS receiver measures the orbital state vector allowing to calculate a two-line element set based on the theories from SGP4.These Orbital Elements are used to predict the position for the next orbit, until a new orbit determination is performed. The implemented model of Earth’s magnetic field needs the current position as input in order to provide the attitude control system with information about the current magnetic field vector.This new approach makes the transmission of the two-line element set from the ground station unnecessary.Several tests showed that the Navigation Solution provides a precise time, position and magnetic field vector to other programs and experiments, consuming only little energy as the GPS receiver is only used once per orbit.
Approved for public release; distribution is unlimited
NPS Report NumberNPS-SP-14-004CR
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