Fig. 5. Elliptical reflector: (-------- ) theoretical curve; (..........) experimental curve (0 < 3°) and envelope (6 > 3°). It must be noticed that the sampling to adopt for depends on the variation of the exponential of [3] in terms of U,y) for this variation is generally much quicker than that ofEU,y). But, for a given observation plane, there exist in the xOy plane parallel lines after which the exponential keeps a constant value. It is therefore possible, by appropriately achieving the discretisation of the aperture, to gain much time in numerical computation. We tested this method to compute the radiation of a periscopic antenna for radio links. It was applied to the projected aperture equivalent to the passive reflector. We obtained an excellent agreement with the experimental results to such low levels as -70 dB (Fig. 5). Recently, another method of numerical computation of formula [2] was proposed (4). It would be interesting to evaluate also its efficiency for the computation of the actual patterns of the SPS transmitting antenna. V. CONCLUSION It is essential to very precisely know the power densities produced on Earth by the SPS radiated beam. For that, the determining of the SPS radiation pattern corresponding to the idealized illumination law of its transmitting antenna is not enough.
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