DOP Analysis for a LEO Navigation Constellation that Relies on Doppler Shift and Pseudorange
Brian McLemore and Mark L. Psiaki, Virginia Tech
Date/Time: Thursday, Sep. 22, 9:20 a.m.
A study is conducted on Dilution of Precision (DOP) metrics for a Low Earth Orbit (LEO) navigation constellation that uses a combination of carrier Doppler shift and pseudorange measurements to provide a point-solution capability for position, clock offset, velocity, and clock offset rate. This study is being conducted in support of efforts to use radio-frequency signals from large LEO constellations as augmentations or alternatives of existing GNSS. This study develops methods to analyze the beneficial effects of adding a sparse set of pseudorange-capable satellites to a large LEO constellation that provides a global navigation capability primarily through the use of carrier Doppler shift. This study aims to find one or more DOP metrics that can be used to predict the navigation accuracy of any navigation system using carrier Doppler shift and pseudorange measurements. The study then considers how these DOP metrics can be used for LEO navigation constellation design. The OneWeb constellation is used as an example for constellation design based on DOP metrics.
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