A scatterometer neural network sensor model with input noise

Cornford, Dan, Ramage, Guillaume and Nabney, Ian T. (1998). A scatterometer neural network sensor model with input noise. Technical Report. Aston University, Birmingham.

Abstract

The ERS-1 satellite carries a scatterometer which measures the amount of radiation scattered back toward the satellite by the ocean's surface. These measurements can be used to infer wind vectors. The implementation of a neural network based forward model which maps wind vectors to radar backscatter is addressed. Input noise cannot be neglected. To account for this noise, a Bayesian framework is adopted. However, Markov Chain Monte Carlo sampling is too computationally expensive. Instead, gradient information is used with a non-linear optimisation algorithm to find the maximum em a posteriori probability values of the unknown variables. The resulting models are shown to compare well with the current operational model when visualised in the target space.

Divisions: Engineering & Applied Sciences > Computer Science
Engineering & Applied Sciences > Systems analytics research institute (SARI)
Uncontrolled Keywords: non-linear regression,input uncertainty,wind retrieval,scatterometer
Published Date: 1998-10-22
Authors: Cornford, Dan ( 0000-0001-8787-6758)
Ramage, Guillaume
Nabney, Ian T. ( 0000-0003-1513-993X)

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