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Observation and simulation of direct and reflected GPS signals in Radio Occultation Experiments
Author(s) -
Beyerle Georg,
Hocke Klemens
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012530
Subject(s) - radio occultation , global positioning system , gps signals , occultation , remote sensing , spectral line , ray tracing (physics) , signal (programming language) , geodesy , geology , physics , assisted gps , optics , computer science , astronomy , telecommunications , programming language
GPS/MET radio occultation observations are analyzed with the radio holographic method. Using the Multiple Signal Classification algorithm power spectra of 2038 radio holograms observed between 2 February and 16 February 1997 are calculated. In about 28% of the analyzed L1‐band spectra secondary frequency components are found at power levels of about 10–20 dB below the main component. These secondary components are interpreted as signatures of GPS signals reflected at Earth's surface. Results from geometrical ray tracing simulations support our interpretation.