+ 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 + Item/Media Type Selected Navigations: Author > Romans, L. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 19 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order 1 2 Next  Constellation Design of the Mars Network: A System for Communication and Navigation at Mars Author(s): Anderson, R.; Bar-Cohen, Y.; Bell, D.; Ely, T.; Guinn, J.; Hart, M.; Kallemeyn, P.; Levene, E.; Jah, M.; Romans, L.; Wu, S. Abstract: Mars has become the focus of an unprecedented series of missions spanning many years, involving numerous nations and evolving from robotics to humans. NASA Center: Jet Propulsion Laboratory Publication Year: 1999 Added to NTRS: 2006-12-25 Document ID: 20060040877 Constellation Design of the Mars Network Author(s): Anderson, R.; Bar-Sever, Y.; Bell, D.; Ely, T.; Guinn, J.; Hart, M.; Kallemeyn, P.; Levene, E.; Jah, M.; Romans, L.; Wu, S. Abstract: Mars has become the focus of an unprecedented series of missions spanning many years, involving numerous nations and evolving from robotics to humans. NASA Center: Jet Propulsion Laboratory Publication Year: 1999 Added to NTRS: 2006-12-25 Document ID: 20060040916 Assessment of GPS Occultations for Atmospheric Profiling Author(s): Hajj, G.; Kursinski, E.; Bertiger, W.; Romans, L.; Hardy, K. Abstract: the concept of utilizing the global positioning system signals as a means of sensing the atmosphere has been studied in some detail in the literature. NASA Center: Jet Propulsion Laboratory Publication Year: 1994 Added to NTRS: 2006-12-25 Document ID: 20060038361 Satellite to Satellite Radio Occultation Science at Mars Author(s): Kursinski, E.; Bar-Sever, Y.; Folkner, W.; Romans, L. Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 2000 Added to NTRS: 2006-12-25 Document ID: 20060040460 Quantum gravity gradiometer sensor for earth science applications Author(s): Yu, N.; Kohel, J. M.; Romans, L.; Maleki, L. Abstract: In this paper, we will describe some of the underlying principles of QGC, discuss its potential capability, and report on the progress of our hardware development to date. NASA Center: Jet Propulsion Laboratory Publication Year: 2002 Added to NTRS: 2006-12-25 Document ID: 20060029591 First Spaceborne Observation of an Earth-Reflected GPS Signal Author(s): Lowe, S.; Zuffada, C.; LaBrecque, J.; Hajj, G.; Young, L.; Romans, L. Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 2000 Added to NTRS: 2006-12-25 Document ID: 20060032628 Searching for life with the Terrestrial Planet Finder: Lagrange point options for a formation flying interferometer Author(s): Beichman, C.; Gomez, G.; Lo, M.; Masdemont, J.; Romans, L. Abstract: In this paper, we describe the mission design for TPF assuming a distributed spacecraft concept using formation flight around both a halo orbit around L2 as well as a heliocentric orbit. Although the mission architecture ... NASA Center: Jet Propulsion Laboratory Publication Year: 2002 Added to NTRS: 2006-12-25 Document ID: 20060039982 Netlander Positioning with the Mars Infrastructure Constellation and its Impact on Martian Geodesy Author(s): Wu, S.; Bar-Sever, Y.; Nandi, S.; Romans, L. Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 1999 Added to NTRS: 2006-12-25 Document ID: 20060040851 Relative time and frequency alignment between two low Earth orbiters, GRACE Author(s): Bertiger, W.; Dunn, C.; Harris, I.; Kruizinga, G.; Romans, L.; Watkins, M.; Wu, S. Abstract: The two GRACE (Gravity Recovery and Climate Experiment) spacecraft were launched into a near polar circular orbit around the earth in March of 2002. The two spacecraft serve as test masses to measure the Earth's ... NASA Center: Jet Propulsion Laboratory Publication Year: 2003 Added to NTRS: 2006-12-25 Document ID: 20060028950 An Examination of the Stability of Monuments used in Permanent GPS Networks Author(s): Hurst, K.; Heflin, M.; Romans, L. Abstract: No Abstract Available NASA Center: Jet Propulsion Laboratory Publication Year: 1994 Added to NTRS: 2006-12-25 Document ID: 20060038008 1 2 Next  + 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