|
|||||
|
|
Ionospheric corrections of MARSIS subsurface sounding signals with filters including collision frequency |
|
| Authors: | Zhenfei Zhang Erling Nielsen Roberto Orosei |
| Institution: | a Max-Planck Institute for Solar System Research, 37191 Katlenburg-Lindau, Germany b Department of Resources and Space Science Center, China University of Geosciences (Wuhan), 388 Lumo Road, 430074 Wuhan, China c Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA d Istituto di Fisica dello Spazio Interplanetario, Istituto Nazionale di Astrofisica, 00133 Rome, Italy e Infocom Department, “La Sapienza” University of Rome, 00184 Rome, Italy |
| Abstract: | Ionospheric corrections of Mars advanced radar for subsurface and ionosphere sounding (MARSIS) subsurface sounding signals are necessary before they can be further analyzed. Usually the ionosphere correction only considers the phase dispersion owing to the electron densities. In this paper we show that if the electron-neutral collision frequency is included in the correction filter, the signal-to-noise ratio of the processed signal can be further maximized and the spatial resolution of the signal be improved. Three different models of the ionosphere profile have been studied, and it is shown that a uniform slab model, of both densities and collisions, is feasible and probably the best choice when implementing the correction filter including collisions. The physical significance of the parameters obtained with the uniform model (equivalent parameters) is discussed, and it is shown that they are useful for the estimation of the real physical parameters of the ionosphere. We developed a recursive, random search algorithm to facilitate the realization of the correction process with the filter including collision frequency. |
| Keywords: | Mars Ionosphere Sounding radar Collision frequency |
| 本文献已被 ScienceDirect 等数据库收录！ | |