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Detailed Reference Information
Rogers et al. 2005
Rogers, L.T., Jablecki, M. and Gerstoft, P. (2005). Posterior distributions of a statistic of propagation loss inferred from radar sea clutter. Radio Science 40: doi: 10.1029/2004RS003112. issn: 0048-6604.

The generation of a posteriori distribution of a statistic of propagation loss conditioned on observed radar sea clutter is described. The statistic u is the 20th percentile level of the two-way propagation loss at a 5-m height over the 10--60 km range interval. A discrete implementation of the Bayesian paradigm is employed. The forward mapping from the space of environmental parameters into the space of radar clutter incorporates a random process model such that many realizations of modeled clutter are generated for each environmental refractivity parameter combination. The algorithm is adjusted such that over a series of simulated inversion runs, it is seen that for intervals between percentile levels (e.g., between the 20th and 80th percentile levels), a posteriori distributions of u contain the ground truth values of u the correct percentage of the time (60% for the used interval). For real data cases, it is observed that the a posteriori distributions are too narrow. The inversion algorithm is used to examine the behavior of the a posteriori distribution as the noise floor is raised. An abrupt reduction in the information obtained from the clutter (indicated by a widening of the a posteriori distribution) occurs when peak clutter levels over the ranges of 25--50 km drop below about 15 dB for both simulated and real data cases.

BACKGROUND DATA FILES

Abstract

Keywords
Mathematical Geophysics, Inverse theory, Radio Science, Remote sensing, Radio Science, Tomography and imaging (7270, 8180), Radio Science, Signal processing, radar, refractivity, clutter
Journal
Radio Science
Publisher
American Geophysical Union
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