Abstract
An investigation was performed to determine an appropriate estimation technique for onboard orbit determination using simulated data of the Tracking and Data Relay Satellite System (TDRSS). A summary of results is presented from studies done with an extended Kalman filter and a sliding batch differential corrector. These estimators were evaluated when used with both baseline and worst-case TDRSS measurement errors and with tracking configurations for two types of orbits: a high-inclination, near-circular orbit with an altitude of 700 km and a moderately inclined, lower altitude orbit. Each estimation result was evaluated by comparing the true ephemeris with the estimated ephemeris.
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