Accommodated in a satellite microwaves - illustration radar system with twice the area of coverage

摘要

Antenna system with a double coverage area for microwave radar imaging by moving satellite in low earth orbit. It is provided with two reflectors main (1, 2) associated with two networks units (3, 4) which are supplied in alternation from a single chain of amplification. The switching between the two units can be obtained by two access to the orthogonal polarizations, on which two waves of different polarizations can be sent. According to a particular embodiment, the electronic switches of polarization (13) are switched alternately the microwave signal (10) to one and the other access of horns bi - polarization which constitute the active array (5). The wave are alternately biased (9) which is emitted is reflected by an auxiliary reflector (18) to at least one collector array (19), connected to the two networks units (3, 4). br / according to another embodiment, the two units (3, 4) are each connected to a respective collector (51, 55). The electronic switches of polarization (13, 14) are switched alternately the microwave signal (10) to one and the other of two networks are active (5, 66). The selectively polarized wave (9 a, 53) which is emitted is reflected by a respective auxiliary reflector (17, 18) towards the respective collector (51, 55), each wave (9 a, 53) having a different polarization. Each manifold (51, 55) is connected to the primary array corresponding (3, 4) by a short connection (32, 56).