GEOSAT Follow-On (GFO): Precise Orbit Ephemeris (NCEI Accession 0085958)
The GEOSAT Follow-On (GFO) program is the Navy's initiative to develop an operational series of radar altimeter satellites to maintain continuous ocean observation from the GEOSAT Exact Repeat Orbit. GFO was launched in February 1998. On 29 November 2000 the Navy accepted the satellite as operational. GFO officially ended on October 22, 2008. POE files are produced at NASA Goddard Space Flight Center (GSFC) within 3-4 weeks for use on the GFO Geophysical Data Record (GDR). They have an expected radial accuracy of 5 cm RMS (Root Mean Squared) over the six day arc.
Dataset Citation
- Cite as: Lillibridge, John; NOAA Center for Satellite Applications and Research (2012). GEOSAT Follow-On (GFO): Precise Orbit Ephemeris (NCEI Accession 0085958). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0085958. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0085958
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2000-01-04 to 2008-09-13 |
Spatial Bounding Box Coordinates |
West: -180
East: 180
South: -72
North: 72
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | === description as of June 24, 2004 ================================ - SLR+Doppler+GFO altimeter crossover tracking data GFO orbit solution - gravity pgs7777b GFO and TOPEX-GFO altimeter crossover data) - tides pgs7777b resonant + ray99.2 background terms (tides.got992.pgs7751q2.pgs7777b) - tuned "macro-model" (presented at EGS 2000) - ITRF2000 SLR station positions and velocities - IERS Bulletin B EOP (Earth Orientation Parameters) - Doppler stations adjusted into the SLR (CSR95L02) frame - MSIS atmosphere model. - GFO spacecraft attitude model. Includes yaw bias. - SLR antenna offset adjusted using SLR data spanning 980530-980628. - DE403 ephemeris - Arcs generally about six days in length. - Arc parameters adjusted: state, drag/8hours, empirical once-per rev accelerations along-track and cross-track/day, Doppler station timing bias - SLR 10cm + DOPPLER 2cm/sec + altimeter crossover 10cm sigma weighting - Altimeter (NOAA IGDR) range correction for crossover processing * ocean tide + tidal loading GOT99.3 (Ray Dec '00) * earth tide Cartwright (NOAA IGDR) * dry troposphere NCEP (NOAA IGDR) * wet troposphere TMR (NOAA IGDR) * ionosphere IRI95 (NOAA IGDR) * inverserse barometer f(dry troposphere) (J. Lillibridge Aug '99) * EM bias 3.8% SWH (C.K Shum June '00) - Altimeter crossover edit (about 15-20% of data is edited) * polynomial mid-point fit to 11 consecutive altimeter ranges < 20 cm * water depth > 500 m * sea surface variability < 20 cm * crossover residual <= 20 cm * crossover residual <= 35 cm as of arc z11101 (020315) to allow more data - GEODYN 0205 version (Dave Rowlands (GSFC), Despina Pavlis (Raytheon)) Reference: Lemoine et.al. "Precise Orbit Determination for GEOSAT Follow-On Using Satellite Laser Ranging Data and Intermission Altimeter Crossovers", 2001 Flight Mechanics Symposium Proceedings, NASA GSFC NASA/CP-2001-209986, pp 377-391, June 2001. |
Purpose | This dataset is available to the public for a wide variety of uses including scientific research and analysis. |
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Last Modified: 2021-10-15T13:29:45Z
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov