HR: 15:25h
AN: G42B-08    [PDF]
TI: Interferometry with GPS Low Earth Orbiters Occultations
AU: * Cardellach, E
EM: Estel.Cardellach@jpl.nasa.gov
AF: NRC associate to NASA/JPL, 4800 Oak Grove Dr, PASADENA, CA 91109 United States
AU: Ao, C O
EM: Chi.O.Ao@jpl.nasa.gov
AF: NASA/Caltech Jet Propulsion Laboratory, 4800 Oak Grove Dr, PASADENA, CA 91109 United States
AU: de la Torre Ju\'{a}rez, M
EM: mtj@jpl.nasa.gov
AF: NASA/Caltech Jet Propulsion Laboratory, 4800 Oak Grove Dr, PASADENA, CA 91109 United States
AU: Hajj, G A
EM: George.A.Hajj@jpl.nasa.gov
AF: NASA/Caltech Jet Propulsion Laboratory, 4800 Oak Grove Dr, PASADENA, CA 91109 United States
AB: GPS signals reflected off the Earth surface can be detected by receivers aboard occulting Low Earth Orbiters (LEO). The geophysical information contained in such reflected signal, has been partially clarified for using radioholographic analysis. After calibration, occultation geometry and the troposphere have the main contributions to the relative delay between direct and reflected signal. The reflected-to-direct relative delay is a function of the location of the reflecting surface as well as the different effect of the troposphere on both ray paths. Information can be obtained from precise measurements of the interferometric delay, and by separating the geometric from the atmospheric effect. This talk presents novel results with centrimetric precision in carrier-phase reflected-to-direct relative delay from GPS to LEO occultations. The separation techniques will be discussed and potential applications of the interferometric delay to Ice surface topography, super-refractivity layer determination, marine boundary layer height detection will be given. Detection of super-refractivity conditions by the interferometric signal can lead to further refinements in the retrievals of lower atmospheric refractivity profiles where biases are known to exist.
DE: 0659 Random media and rough surfaces
DE: 0669 Scattering and diffraction
DE: 0694 Instrumentation and techniques
DE: 1200 GEODESY AND GRAVITY
SC: Geodesy [G]
MN: 2003 Fall Meeting