GEOSAT Follow-On (GFO): Precise Orbit Ephemeris (NODC 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.
  • Cite as: Lillibridge, John; US DOC/NOAA/NESDIS > Center for Satellite Applications and Research (2012). GEOSAT Follow-On (GFO): Precise Orbit Ephemeris (NODC Accession 0085958). Version 1.1. National Oceanographic Data Center, NOAA. Dataset. [access date]
gov.noaa.nodc:0085958
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Distributor DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
301-713-3277
NCEI.Info@noaa.gov
Dataset Point of Contact Information Services
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
301-713-3277
NCEI.Info@noaa.gov
Time Period 2000-01-04 to 2008-09-13
Spatial Bounding Box Coordinates
N: 72
S: -72
E: 180
W: -180
Spatial Coverage Map
General Documentation
Associated Resources
  • GEOSAT Follow-On (GFO) Geophysical Data Record, Sensor Data Records, Operational Orbit Determination, Housekeeping Telemetry, Calibration and Waveform Data, and Precise Orbit Ephemerides from 1998-02-10 to 2008-10-22
    • NCEI Collection
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  • Parent ID (indicates this is related to other data):
    • gov.noaa.nodc:GEOSAT-GFO
Publication Dates
  • publication: 2012-10-01
Edition 1.1
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
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 Basic research
Use Limitations
  • accessLevel: Public
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Theme keywords NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS
Platform keywords NODC PLATFORM NAMES THESAURUS Global Change Master Directory (GCMD) Platform Keywords
  • GFO-1 > GEOSAT FOLLOW-ON-1
Instrument keywords NODC INSTRUMENT TYPES THESAURUS
Place keywords NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords
  • GEOGRAPHIC REGION > GLOBAL OCEAN
Keywords NCEI ACCESSION NUMBER
Use Constraints
  • Cite as: Lillibridge, John; US DOC/NOAA/NESDIS > Center for Satellite Applications and Research (2012). GEOSAT Follow-On (GFO): Precise Orbit Ephemeris (NODC Accession 0085958). Version 1.1. National Oceanographic Data Center, NOAA. Dataset. [access date]
Access Constraints
  • NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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Lineage information for: dataset
Processing Steps
  • 2012-10-01T10:51:13 - NCEI Accession 0085958 v1.1 was published.
Output Datasets
Lineage information for: repository
Processing Steps
  • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Acquisition Information (collection)
Instrument
  • satellite sensor - altimeter
Platform
  • GFO
Last Modified: 2018-08-08T21:12:45
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