Tilts associated with ionospheric horizontal gradients are one of the causes of bearing errors in HF links. Our purpose is to describe a fast, three dimensional, ray tracing procedure using geometrical optics. A three dimensional model was built, based on the spatially variable parameters of the ionospheric layers obtained from forecast procedures, associated with an MPQ profile, which may be considered as realistic. The refractive index and the vertical and horizontal gradients are taken into account. In this paper, a software permitting to estimate the mean bearing deviations estimation is described.
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