نتایج جستجو برای: echo sounding
تعداد نتایج: 34809 فیلتر نتایج به سال:
Since HMS Challenger made the first sounding in Mariana Trench 1875, scientists and explorers have been seeking to establish exact location depth of deepest part ocean. The scientific consensus is that situated Deep, an abyss with depths greater than 10,000 m. Since1952, when II, following its namesake, returned Trench, 20 estimates (including one from this study) Deep made. are as diverse meth...
SHARAD (SHAllow RADar) is a radar for the study of the Martian subsurface provided by the Italian Space Agency (ASI) as a facility instrument on board NASA’s Mars Reconnaissance Orbiter 2005 spacecraft. The scientific objective of SHARAD is the detection of water, either liquid or solid, and the profiling of subsurface ice layers in the first hundreds of meters of the Martian subsurface. Althou...
The detailed knowledge of the directional characteristics of the mobile radio channel is required to develop directional channel models and to design efficient smart antenna concepts for future mobile radio systems. In this paper, we examine the applicability and performance of two popular high-resolution parameter estimation schemes for directional channel sounding, namely subspace-based Unita...
Introduction: Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) on board Mars Express is a decameter sounder radar, which can work in two different modes : subsurface or ionosphere sounding. The subsurface sounding uses 4 different frequency bands, which are centered to 1.8, 3, 4 and 5 MHz. Each band is 1 MHz wide. [1,2]. In this work, we study the reflectivity of Martian surf...
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