Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS)
Detailed Description
Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS): "MARSIS is a low frequency, nadir-looking pulse limited radar sounder and altimeter with ground penetration capabilities, which uses synthetic aperture techniques and a secondary receiving antenna to isolate subsurface reflections." Read more at the Mars Express Instrumentation website.
Sources/Usage
Public Domain.