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Longue range propagation of surface waves above uneven ground – PSOL

Submission summary

The surface propagation of radio waves over the ground is subject to many disturbances related to the terrestrial environment. The vegetation, the moisture, the soil features and the relief introduce phenomena of backscattering, absorption and dispersion on the electromagnetic radiation which will impact the link budget between communicating objects (vehicles, infrastructures) or transmitter - receiver pairs. The calculation of radiation in this context of terrestrial communications is not mastered and would require a rigorous consideration of the environment over significant distances. This project proposes the realization of a wide band simulation software to efficiently deal with long distance propagation, i.e. several thousands of wavelengths, while taking into account the heterogeneity of both the ground, the land profile and the vegetation. We rely on the finite difference method in the time domain and we propose to develop the techniques of window moving, domain decomposition, and to increase FDTD accuracy order for coarse meshes. The 3D modeling should take into account real land and target the HF, VHF and UHF bands to cover most civil and military terrestrial communications. It also integrates the antenna and carrier devices for transmission and reception. The targeted applications are terrestrial communication environments, inter-vehicle communications, with fixed stations or land operators, radiocompatibility, long range Radar detection of subsurface objects, on the ground or at low altitudes. Many spin-offs are expected on other propagation issues such as lightning, propagation on the sea and in urban environments. The proposed rigorous approach will also be able to provide accurate radiation models to outdoor radio coverage software which are based on fast computation methods but really approximate to predict propagation in complex environments.

Project coordination

Christophe Guiffaut (Institut XLIM)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


XLIM Institut XLIM

Help of the ANR 275,611 euros
Beginning and duration of the scientific project: - 36 Months

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