Refractivity estimation from radar sea clutter |
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Authors: | Huang Si-Xun Zhao Xiao-Feng and Sheng Zheng |
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Institution: | Institute of Meteorology, PLA University of Science & Technology, Nanjing 211101, China |
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Abstract: | This paper addresses the problem of estimating lower
atmospheric refractivity under the nonstandard propagation conditions
frequently encountered in low altitude maritime radar applications.
The vertical structure of the refractive environment is modeled by
using a five-parameter model, and the horizontal structure is modeled
as range-independent. The electromagnetic propagation in the
troposphere is simulated by using a split-step fast Fourier
transform based on parabolic approximation to the wave equation. A
global search marked as a modified genetic algorithm (MGA) for the 5
environmental parameters is performed by using a genetic algorithm
(GA) integrated with a simulated annealing technique. The retrieved
results from simulated runs demonstrate the ability of this method
to make atmospheric refractivity estimations. A comparison with the classical GA
and the Bayesian Markov Chain Monte Carlo (Bayesian-MCMC) technique
shows that the MGA can not only shorten the inverse time but also
improve the inverse precision. For real data cases, the inversion
values do not match the reference data very well. The
inverted profile, however, can be used to synoptically describe
the real refractive structure. |
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Keywords: | atmosphere duct parabolic wave equation refractivity
from clutter |
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