Analysis on the Performance Bound of Doppler Positioning Using One LEO Satellite

For GNSS receivers where ground aiding service such as AGPS is not available, space borne GNSS aiding based on LEO satellites is a meaningful alternative. For space-borne GNSS aiding, Doppler positioning is generally used for user position initialization. In extreme cases, Doppler positioning may be the only means for positioning. In this work, we analyzed the doppler positioning performance bounds based on the spherical-earth model which is an significant step forward than that based on the flat model in existing work. Extensive simulations are conducted and both theoretical error distributions and practical results based on original LING QIAO GPS (Int'l ID:40136) readings are given. The results show that:(1) Doppler positioning based on full one pass data can achieve a performance that less than 100m most of the time; (2) The results based on the sphericalearth model are different, but are believed to be more accurate than the results based on the flat model.