초록 ▼

An electronically-scanned two-beam antenna designed for being installed on board a moving platform, and in particular a satellite. The antenna of the invention comprises a single, complex reflector whose reflectivity is responsive to the polarization with which it is illuminated, and associated with

An electronically-scanned two-beam antenna designed for being installed on board a moving platform, and in particular a satellite. The antenna of the invention comprises a single, complex reflector whose reflectivity is responsive to the polarization with which it is illuminated, and associated with two arrays of orthogonally-polarized sources that illuminate the complex reflector using an offset configuration. The complex reflector is made up of two reflectors placed one in front of the other in the beam propagation direction. The first reflector is transparent to a first linear polarization and reflective to an orthogonal polarization, while the second reflector is reflective at least for the first polarization. The two resulting beams thus propagate in different directions, both parallel to the trajectory of the platform. Electronic scanning is provided in a plane perpendicular to the orbit plane. The invention is applicable to stereoscopic radars for observing the earth from a satellite, and also to radiometry.

대표청구항 ▼

A stereoscopic satellite-based radar system having an electronically-scanned antenna supported on a non-geostationary satellite, the improvement wherein said antenna comprises: a first source for emitting a first polarized beam; a second source for emitting a second beam polarized orthogonally to sa

A stereoscopic satellite-based radar system having an electronically-scanned antenna supported on a non-geostationary satellite, the improvement wherein said antenna comprises: a first source for emitting a first polarized beam; a second source for emitting a second beam polarized orthogonally to said first polarized beam; a first reflector for reflecting said first beam to a first region of the surface of the earth and for passing said second beam without substantial reflection; and a second reflector for reflecting said second beam to a second region of the surface of the earth.