+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Gaiser, Peter W.  Author > Meissner, Thomas  Author > Poe, Gene  Author > Purdy, William E.  Author > Uliana, Enzo A.  Author > Wentz, Frank J.  NASA Center > NASA (non Center Specific)  Publication Year > 2001-2010 > 2006  Subject > G-I > Geosciences (general)  Availability Options > Order From Other Sources  Item/Media Type > Journal Article  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: Geolocation and Pointing Accuracy Analysis for the WindSat Sensor Author(s): Meissner, Thomas; Wentz, Frank J.; Purdy, William E.; Gaiser, Peter W.; Poe, Gene; Uliana, Enzo A. Abstract: Geolocation and pointing accuracy analyses of the WindSat flight data are presented. The two topics were intertwined in the flight data analysis and will be addressed together. WindSat has no unusual geolocation requirements relative to other sensors, but its beam pointing knowledge accuracy is especially critical to support accurate polarimetric radiometry. Pointing accuracy was improved and verified using geolocation analysis in conjunction with scan bias analysis. nvo methods were needed to properly identify and differentiate between data time tagging and pointing knowledge errors. Matchups comparing coastlines indicated in imagery data with their known geographic locations were used to identify geolocation errors. These coastline matchups showed possible pointing errors with ambiguities as to the true source of the errors. Scan bias analysis of U, the third Stokes parameter, and of vertical and horizontal polarizations provided measurement of pointing offsets resolving ambiguities in the coastline matchup analysis. Several geolocation and pointing bias sources were incfementally eliminated resulting in pointing knowledge and geolocation accuracy that met all design requirements. NASA Center: NASA (non Center Specific) Publication Date: March 2006 Document Source: Other Sources No Digital Version Available: Go to Tips On Ordering Document ID: 20090001332 Publication Information: IEEE Transactions on Geoscience and Remote Sensing, Volume 44, No. 3, 496 - 505, Number of Pages = 10 Contract-Grant-Task Number: NNH06CC29C Keywords: POSITION (LOCATION); POLARIMETRY; BEAMS (RADIATION); ACCURACY; RESOLUTION; ERRORS; RADIOMETERS; Accessibility: Unclassified; Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2009-01-15 + 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