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Deriving Atmospheric Density Estimates Using Satellite Precision Orbit Ephemerides
Hiatt, Andrew Timothy
Hiatt, Andrew Timothy
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Abstract
Current atmospheric models are incapable of properly modeling all of the density variations in the Earth’s upper atmosphere. Precision orbit ephemerides (POE) are utilized in an orbit determination process to generate improved atmospheric density estimates. Based on their correlation to accelerometer density, the POE density estimates were demonstrated to be an improvement over existing atmospheric models and somewhat better than the improved density estimates from the High Accuracy Satellite Drag Model regardless of solar and geomagnetic activity levels. The POE density estimates were obtained with the desired accuracy for a ±10% variation in the ballistic coefficient used to initialize the process. Fit span length showed little influence on the POE density estimate accuracy. POE density estimate overlap regions demonstrated a method of determining the consistency of the solutions. Gravity Recovery and Climate Experiment POE density estimates showed consistent results with the Challenging Mini−Satellite Payload POE density estimates.
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Date
2009-01-01
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University of Kansas
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Keywords
Aerospace engineering, Atmospheric density estimates, Champ, Grace, Orbit determination, Precision orbit ephemerides, Thermospheric and exospheric density