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Chin. Phys. B, 2009, Vol. 18(11): 5084-5090    DOI: 10.1088/1674-1056/18/11/079
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS Prev   Next  

Refractivity estimation from radar sea clutter

Huang Si-Xun (黄思训), Zhao Xiao-Feng (赵小峰), Sheng Zheng (盛峥)
Institute of Meteorology, PLA University of Science & Technology, Nanjing 211101, China
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.
Keywords:  atmosphere duct      parabolic wave equation      refractivity from clutter  
Received:  21 December 2008      Revised:  13 March 2009      Accepted manuscript online: 
PACS:  92.60.Ta (Electromagnetic wave propagation)  
  42.68.Ay (Propagation, transmission, attenuation, and radiative transfer)  
  84.40.Xb (Telemetry: remote control, remote sensing; radar)  
Fund: Project supported by the National Natural Science Foundation of China(Grant No 40775025).

Cite this article: 

Huang Si-Xun (黄思训), Zhao Xiao-Feng (赵小峰), Sheng Zheng (盛峥) Refractivity estimation from radar sea clutter 2009 Chin. Phys. B 18 5084

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[2] Inversion for atmosphere duct parameters using real radar sea clutter
Sheng Zheng(盛峥) and Fang Han-Xian(方涵先) . Chin. Phys. B, 2012, 21(2): 029301.
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