Use of ASTER GDEM for separating rain echo and surface clutter in the radar observation of rain from space

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Separation between rain echo and surface clutter is essential in the radar observation of rain from space. However, the separation between these becomes very difficult in the radar observation over high mountain areas where the range profile of surface clutter takes a complicated shape. It is expected that this separation problem would be solved by the use of a reliable, high resolution digital elevation model. This paper examines the feasibility of using a high resolution ASTER GDEM for the separation of rain echo and surface clutter. Using the height information of ASTER GDEM, a simulation of the range profile of the surface clutter is made by assuming triangle surface elements and Lambert's law. The simulation results are compared with some TRMM PR data. The comparison shows that the simulation produces a reasonable result in the nadir direction and, to some extent, at the antenna scan edges. Tough the occurrence is very small, there seems to be some areas where the accuracy of ASTER GDEM is not good.

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