Follow this link to skip to the main content NASA Jet Propulsion Laboratory California Institute of Technology JPL HOME EARTH SOLAR SYSTEM STARS & GALAXIES SCIENCE & TECHNOLOGY BRING THE UNIVERSE TO YOU JPL Email News RSS Podcast Video
JPL Banner
Ocean Surface Topography from Space
Using GPS to Minimize Temporal and Spatial Errors in Precise Orbit Determination


William Bertiger - (California Institute of Technology - Jet Propulsion Laboratory)

The position of the satellite in satellite altimetry directly effects the accuracy of the measurement of sea surface height. A radial error of 1 cm in positioning is a one cm error in the sea surface height. Over the years, our team has driven the errors in precise orbit determination (POD) of altimetry satellites down to the sub-cm level. We wish to continue our quest to improve precision orbit determination with a focus on GPS data for altimetry missions, which started Topex/Poseidon and continued through JASON-1 and JASON-2. We will continue to improve our force modeling and data processing techniques applying them to both historical data and the upcoming JASON-3 satellite. For JASON-3 we will perform the necessary on-orbit tuning of the POD force model and data processing to quickly obtain orbits with accuracy comparable to the best determined JASON-2 orbits. Over the life of the four-year proposal, we intend to make significant improvements in the POD of Topex/Poseidon and the JASON series. These efforts will address both random and systematic POD errors including long-term systematic errors effecting climate studies.

Link to
Site Manager: Margaret Srinivasan
Webmaster: Kristy Kawasaki
JPL Clearance: CL01-1707