Ambiguity Problem in the Earth's Surface Altimetry

Min-Ho KA  Victor V. EGOROV  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.11   pp.3232-3236
Publication Date: 2007/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.11.3232
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Sensing
altimetry,  Earth's surface model,  radar,  remote sensing,  

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This paper addresses the ambiguity of radar altimetry related to the statistical nature of the Earth's surface roughness. A hypothetic altimetry method, which provides a simple way to quantify the measures of ambiguity, is proposed. Cramer-Rao lower bounds on the variances of estimates for the mean altitude and root-mean-square height of the sea surface are suggested as such quantitative measures. The accuracy of some types of air- and spaceborne radar altimeters is numerically analyzed against the derived lower bounds.