Effect of propagation model fidelity on passive radar performance predictions

Dabrowski, Ted; Barott, William C.; Himed, Braham

doi:10.1109/radar.2015.7131234

Cited by 3 publications

(1 citation statement)

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“…The drawback is that the calculations are limited by the electric size of the calculation domain. Multi functional wave propagation calculation software generally needs to integrate a variety of different solvers [49], of which the parabolic equation method is mainly used to solve the wave propagation in the near surface airspace. Under the current computer hardware conditions, the practical problems that can be solved by using the parabolic equation method all satisfy , i.e.…”

Section: A Formula Derivationmentioning

confidence: 99%

General Formulas of Effective Earth Radius and Modified Refractive Index

Feng

Huang

2021

IEEE Access

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The effective earth radius can transform the curved ray path into a straight line, and the modified refractive index can transform the spherical ground into a plane. Using them can simplify the propagation modeling of electromagnetic waves in the atmosphere, so they are widely used in the calculation of long-range propagation of electromagnetic wave, and adopted by the ITU Recommendations and the IEEE Standards. In this paper, upon employing simple geometric methods, we provide general formulas for the effective earth radius and the modified refractive index, pointing out that they both originate from the use of conformal transformations. In turn, we prove that for both quantities the formulas contained in the ITU Recommendations and the IEEE Standards are special cases of the general formulas given in this paper. Our results provide a solid mathematical background to the concepts of effective earth radius and modified refractive index, and pave the way for their use beyond the propagation of electromagnetic waves in the earth atmosphere, e.g. to the propagation of other types of waves in generic media.INDEX TERMS Effective earth radius, modified refractive index, conformal transformation, wave propagation, ray tracing.

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Section: A Formula Derivationmentioning

confidence: 99%