Abstract

A domain decomposition method for analyzing very large FDTD domains, tens of thousands of wavelengths long, is demonstrated by application to the problem of RADAR scattering in the maritime environment. Success depends on the elimination of artificial scattering from the “sky” boundary which is ensured by an ultra-high performance absorbing termination that eliminates this reflection at angles of incidence less than 0.03 degrees off grazing. The results are cross-validated against a parabolic equation (PE) method and surface integral equation method on a 1.7km sea surface problem, and to a PE method on propagation through an inhomogeneous atmosphere in a 4kmlong space, both at X-band. Further comparisons are made against boundary integral equation and PE methods from the literature in a 3.6km space containing an inhomogeneous atmosphere above a flat sea at S-band. Details of the method are given for the twodimensional problem (2D). Application to three-dimensions (3D) is demonstrated by comparing the 2D solution to the 3D solution of a sea-corridor 1.3m wide, 2.25m tall, by 110m long.

Original languageEnglish (US)
JournalIEEE Transactions on Antennas and Propagation
DOIs
StateAccepted/In press - Jun 29 2018

Fingerprint

Radar
Scattering
Domain decomposition methods
Boundary integral equations
Integral equations
Wavelength

Keywords

  • domain decomposition
  • FDTD
  • RADAR scattering
  • rough surface scattering
  • true grazing absorbing boundaries

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

@article{af5a07c3be01452a8f9b46f4ee3d4376,
title = "FDTD Simulation of Very Large Domains Applied to Radar Propagation over the Ocean",
abstract = "A domain decomposition method for analyzing very large FDTD domains, tens of thousands of wavelengths long, is demonstrated by application to the problem of RADAR scattering in the maritime environment. Success depends on the elimination of artificial scattering from the “sky” boundary which is ensured by an ultra-high performance absorbing termination that eliminates this reflection at angles of incidence less than 0.03 degrees off grazing. The results are cross-validated against a parabolic equation (PE) method and surface integral equation method on a 1.7km sea surface problem, and to a PE method on propagation through an inhomogeneous atmosphere in a 4kmlong space, both at X-band. Further comparisons are made against boundary integral equation and PE methods from the literature in a 3.6km space containing an inhomogeneous atmosphere above a flat sea at S-band. Details of the method are given for the twodimensional problem (2D). Application to three-dimensions (3D) is demonstrated by comparing the 2D solution to the 3D solution of a sea-corridor 1.3m wide, 2.25m tall, by 110m long.",
keywords = "domain decomposition, FDTD, RADAR scattering, rough surface scattering, true grazing absorbing boundaries",
author = "Dowd, {Brandon W.} and Rodolfo Diaz",
year = "2018",
month = "6",
day = "29",
doi = "10.1109/TAP.2018.2852141",
language = "English (US)",
journal = "IEEE Transactions on Antennas and Propagation",
issn = "0018-926X",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - FDTD Simulation of Very Large Domains Applied to Radar Propagation over the Ocean

AU - Dowd, Brandon W.

AU - Diaz, Rodolfo

PY - 2018/6/29

Y1 - 2018/6/29

N2 - A domain decomposition method for analyzing very large FDTD domains, tens of thousands of wavelengths long, is demonstrated by application to the problem of RADAR scattering in the maritime environment. Success depends on the elimination of artificial scattering from the “sky” boundary which is ensured by an ultra-high performance absorbing termination that eliminates this reflection at angles of incidence less than 0.03 degrees off grazing. The results are cross-validated against a parabolic equation (PE) method and surface integral equation method on a 1.7km sea surface problem, and to a PE method on propagation through an inhomogeneous atmosphere in a 4kmlong space, both at X-band. Further comparisons are made against boundary integral equation and PE methods from the literature in a 3.6km space containing an inhomogeneous atmosphere above a flat sea at S-band. Details of the method are given for the twodimensional problem (2D). Application to three-dimensions (3D) is demonstrated by comparing the 2D solution to the 3D solution of a sea-corridor 1.3m wide, 2.25m tall, by 110m long.

AB - A domain decomposition method for analyzing very large FDTD domains, tens of thousands of wavelengths long, is demonstrated by application to the problem of RADAR scattering in the maritime environment. Success depends on the elimination of artificial scattering from the “sky” boundary which is ensured by an ultra-high performance absorbing termination that eliminates this reflection at angles of incidence less than 0.03 degrees off grazing. The results are cross-validated against a parabolic equation (PE) method and surface integral equation method on a 1.7km sea surface problem, and to a PE method on propagation through an inhomogeneous atmosphere in a 4kmlong space, both at X-band. Further comparisons are made against boundary integral equation and PE methods from the literature in a 3.6km space containing an inhomogeneous atmosphere above a flat sea at S-band. Details of the method are given for the twodimensional problem (2D). Application to three-dimensions (3D) is demonstrated by comparing the 2D solution to the 3D solution of a sea-corridor 1.3m wide, 2.25m tall, by 110m long.

KW - domain decomposition

KW - FDTD

KW - RADAR scattering

KW - rough surface scattering

KW - true grazing absorbing boundaries

UR - http://www.scopus.com/inward/record.url?scp=85049317903&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85049317903&partnerID=8YFLogxK

U2 - 10.1109/TAP.2018.2852141

DO - 10.1109/TAP.2018.2852141

M3 - Article

JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

SN - 0018-926X

ER -