HR: 08:45h
AN: G51D-04 INVITED     [Abstracts]
TI: The effect of the 2nd order ionosphere correction on GPS orbits and station positions
AU: * Kedar, S
EM: Sharon.Kedar@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Hajj, G A
EM: George.A.Hajj@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Komjathy, A
EM: Attila.Komjathy@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Wilson, B D
EM: Brian.D.Wilson@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Bertiger, W I
EM: William.I.Bertiger@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AB: The Global Positioning System (GPS) transmits two frequencies, allowing users to correct for the first-order ionospheric signal group delay (or phase advance) that can be as large as 100 meters on L1 frequency. The second-order ionospheric term, caused by the Faraday rotation effect induced by the Earth magnetic field, is about 1000 times smaller and usually ignored. Implementation of the 2nd order correction suggested by Bassiri and Hajj [1993] was shown by Kedar et al. [2003] to affect station positions from sub-daily to annual time-scale. The correction causes a latitude-dependent 0.1-0.5 cm southward shift in the position, which is roughly proportional to the integrated electron density above the receiver, and has strong diurnal, seasonal and decadal signatures. We will present new results incorporating the 2nd order correction in routine sub-daily and daily data processing, and discuss its effect on station positions as will as on GPS orbit estimates.
DE: 1200 GEODESY AND GRAVITY
DE: 1223 Ocean/Earth/atmosphere interactions (3339)
DE: 1241 Satellite orbits
DE: 1243 Space geodetic surveys
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting