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Radio wave back‐propagating in polar coordinates: A linear filter in the time‐frequency angle‐frequency domain
Author(s) -
Herique A.
Publication year - 1999
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/1998rs900022
Subject(s) - physics , comet , cartesian coordinate system , frequency domain , computational physics , polar coordinate system , wave propagation , optics , acoustics , geometry , mathematical analysis , mathematics , astrophysics
The Comet Nucleus Sounding Experiment by Radio Wave Transmission (CONSERT) is a tomography of a comet nucleus for the ROSETTA mission, which consists of the transmission of electromagnetic waves between a lander on the comet nucleus surface and an orbiter through the nucleus to study its internal structure. The data inversion requires back‐propagating the electric field from the orbit to the nucleus surface. In order to take into account the circular geometry of the boundary conditions, we propose a back‐propagation in the angle‐frequency time‐frequency domain. This new method is described in this paper. We analyze similarities and differences with classical methods in Cartesian coordinates in terms of dispersion equations and evanescent waves; and we used this study to stabilize our back‐propagating filter. This method is then tested on CONSERT synthetic data.