Radome

Composition

The radome is made of materials light, resistant, nonmetal and impermeable such as the Glass fiber. Even with these characteristics, the radome contributes to an overload on the basis of radar and to the oscillation by the wind of the turn which supports it. It is thus necessary to hold of it account during the creation of the plans.

For the radars, the radome will be generally a dome Géodésique of enough broad diameter to allow the rotation and the shift phase of rise between the horizontal one and the zenith, like protecting the electronic instruments.

Applications

The radome is used to prevent the Accumulation S of Glace, mainly by the Verglas), directly on the Métal of the Surface of the antenna. In the case of a Radar with sweeping, the radome also protects from the impacts from remains and the variations speeds from Rotation from the antenna by the effect of the Vent. On a plane, in addition to protecting, the radome contributes to the Aérodynamisme.

For the antennas Stationary S, an accumulation of excessive ice can change its characteristics, by change of impedance, reducing the Fréquence emission of the impulses drastiquement. The energy not emitted turns over to the transmitter and the fact of overheating. A electronic Circuit starts then to reduce the emitted power and thus the aerial capacity.

For the military applications and as monitoring, a radome is often used in more to hide the characteristics of the system. From a strategic point of view, the radome makes it possible to mask the parabolas. Indeed, the orientation of a parabola determines the field of listening. The radome thus makes it possible to listen without knowing which one listens. The famous system Level, set up during the Second world war jointly by the the United States and the the United Kingdom through the agreement UKUSA, also uses of the radomes. These species of balloons cover the bases of listenings of the telecommunications mainly used by NSA.

Alternatives

The radome presents some disadvantages, like a certain visual pollution.

The other solution is the recourse to heating devices, in D.C. current rather than in Alternative course, to prevent the formation of ice without interfering with the transmission nor the reception. However, they are not very operational on many sites where the position and the availability in energy are big factors.

Works

The largest Radome of the world is with the Cité of the télécoms in Brittany (center of discovered telecommunications). It measures 50m top and 64m broad.

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