+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + Publication Year + Subject + Availability Options + Item/Media Type Selected Navigations: Author > Bertiger, Willy [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 9 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order GPS-Like Tracking (GLT) of Geosynchronous Satellites: Orbit Determination Results for INMARSAT and TDRS Author(s): Haines, Bruce; Bertiger, Willy; Lichten, Steve; Srinivasan, Jeff; Kelecy, Tom Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 1995 Added to NTRS: 2006-12-25 Document ID: 20060041815 Single Frequency GPS Orbit Determination for Low Earth Orbiters Author(s): Bertiger, Willy; Wu, Sien-Chong Abstract: A number of missions in the future are planning to use GPS for precision orbit determination. Cost considerations and receiver availability make single frequency GPS receivers attractive if the orbit accuracy requirements ... NASA Center: Jet Propulsion Laboratory Publication Year: 1996 Added to NTRS: 2006-12-25 Document ID: 20060035968 Extending GPS orbit and clock products to high rate GPS satellite clock solution Author(s): Kuang, Da; Bertiger, Willy; Byun, Sung; Zumberge, James Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 2006 Added to NTRS: 2006-12-25 Document ID: 20060044044 GRACE: from measurement to gravity Author(s): Kruizinga, Gerhard; Bertiger, Willy; Romans, Larry; Watkins, Michael; Wu, Sien; Bettadpur, Srinivas Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 2004 Added to NTRS: 2006-12-25 Document ID: 20060043049 Performance Analysis of AUTONAV GPS Orbit Determination. Institute of Navigation, International Technical Meeting, Palm Springs, California, September 12-15, 1995 Author(s): Wu, Sien; Bertiger, Willy; Muellerschoen, Ron; Lichten, Stephen Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 1995 Added to NTRS: 2006-09-29 Document ID: 20060041887 How well can gravity be recovered using Topex and GPS data Author(s): Bertiger, Willy; Wu, Sien-Chong; Wu, J. T.; Skrumeda, Lisa Abstract: When Topex is launched in mid-1992 it will carry a high quality GPS receiver which will operate in concert with a worldwide network of precision GPS ground receivers. The data from these receivers can be used to recover new ... NASA Center: Jet Propulsion Laboratory Publication Year: 1990 Added to NTRS: 2004-11-03 Accession Number: 90A46762; Document ID: 19900059707; Report Number: AAS PAPER 89-360 Preliminary GPS orbit determination results for the Extreme Ultraviolet Explorer Author(s): Gold, Kenn; Bertiger, Willy; Wu, Sien; Yunck, Tom Abstract: A single-frequency Motorola Global Positioning System (GPS) receiver was launched with the Extreme Ultraviolet Explorer mission in June 1992. The receiver utilizes dual GPS antennas placed on opposite sides of the satellite ... NASA Center: Jet Propulsion Laboratory Publication Year: 1993 Added to NTRS: 2004-11-03 Accession Number: 95A81399; Document ID: 19950049800 Global geodesy using GPS without fiducial sites Author(s): Heflin, Michael; Bertiger, Willy; Blewitt, Geoff; Freedman, Adam; Hurst, Ken; Lichten, Steve; Lindqwister, Ulf; Vigue, Yvonne; Webb, Frank; Yunck, Tom, et al. Abstract: Baseline lengths and geocentric radii have been determined from GPS data without the use of fiducial sites. Data from the first GPS experiment for the IERS and Geodynamics (GIG '91) have been analyzed with a no-fiducial ... NASA Center: Jet Propulsion Laboratory Publication Year: 1992 Added to NTRS: 2004-11-03 Accession Number: 92A24218; Document ID: 19920041594 Early results from the TOPEX/POSEIDON GPS precise orbit determination demonstration Author(s): Bertiger, Willy; Wu, Sien; Yunck, Tom; Muellerschoen, Ron; Willis, Pascal; Bar-Sever, Yoaz; Davis, AB; Haines, Bruce; Munson, Tim; Lichten, Steve, et al. Abstract: TOPEX/POSEIDON, a US/French oceanographic mission launched in August 1992, is the first earth satellite to carry a multi-channel, dual frequency Global Positioning System (GPS) receiver capable of making high precision ... NASA Center: Jet Propulsion Laboratory Publication Year: 1993 Added to NTRS: 2004-11-03 Accession Number: 95A81396; Document ID: 19950049797 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007