Copolarized and Cross-Polarized Backscattering From Random Rough Soil Surfaces From L-Band to Ku-Band Using Numerical Solutions of Maxwell's Equations With Near-Field Precondition

Tien Hao Liao, Leung Tsang, Shaowu Huang, Noppasin Niamsuwan, Sermsak Jaruwatanadilok, Seung Bum Kim, Hsuan Ren, Kuan Liang Chen

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We extend the 3-D numerical method of Maxwell's equation (NMM3D) for rough soil surface scattering from L-band to C-, X-, and Ku-bands. We illustrate the results for copolarization, cross-polarization, and polarization ratio (HH/VV). Copolarized and cross-polarized backscattering coefficients from NMM3D are analyzed for frequency dependence, incident angle dependence, and soil moisture dependence. We also cross compare results from analytical and empirical models. The 16 × 16 squared wavelength (λ2) of rough surface is applied for NMM3D using 256 processors on NSF Extreme Science and Engineering Discovery Environment clusters. Polarization ratio, HH/VV, is studied to address the feature of dependence on frequency for same fields (same physical parameters for the model). HH/VV is shown useful to provide additional information to study land surface. Results from NMM3D are also validated with POLARSCAT measurement data-1. NMM3D shows good agreement with data and better performance while considering copolarization, cross-polarization, and polarization ratio (HH/VV) together. The key advancement in computation efficiency in this paper is the implementation of a physically based near-field precondition algorithm in NMM3D to accelerate parallel computation. With precondition, the computation time is faster by ten times for larger root-mean-square height.

Original languageEnglish
Article number7254168
Pages (from-to)651-662
Number of pages12
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume54
Issue number2
DOIs
StatePublished - Feb 2016

Keywords

  • Near-field precondition
  • numerical Maxwell solution
  • polarization ratio
  • rough surface
  • soil moisture

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