Reflector antenna for a synthetic aperture radar

摘要

A reflector antenna for synthetic aperture radar, having a reflector including a reflector surface, a vertex, and an optical axis. The reflector antenna also as a plurality of antenna elements arranged side by side and in a row, for transmitting radar transmission signals and receiving radar reception signals produced from a reflection on a surface. The reflector is designed as a one-dimensional defocused reflector having two focal planes. The optical axis coincides with the line of inter-section of two imaginary planes extending at right angles to one another. The reflector has, in a first (X-) plane, a first (X-) focal plane that extends at right angles thereto and to the optical axis, and, in a second (Y-) plane, a second (Y-) focal plane which extends at right angles thereto and to the optical axis. The second (Y-) focal plane is at a greater distance from the vertex than the first (X-) focal plane.

主权项

1. A reflector antenna for a synthetic aperture radar, said reflector antenna comprising
a reflector having a reflector surface, a vertex, and an optical axis extending outwards therefrom, and a plurality of antenna elements arranged side by side and in a row, for transmitting radar transmission signals and for receiving radar reception signals generated by reflection on a surface, wherein the reflector is designed as a one-dimensionally defocused reflector having two focal planes, the optical axis coincides with the intersection line of two imaginary planes extending at right angles to one another, specifically a first (X-) plane and a second (Y-) plane, the reflector has, in the first (X-) plane, a first (X-) focal plane that extends at right angles thereto and to the optical axis, the reflector has, in the second (Y-) plane, a second (Y-) focal plane which extends at right angles thereto and to the optical axis, the second (Y-) focal plane is at a greater distance from the vertex than the first (X-) focal plane, and when viewing the first (X-) plane of the reflector, the antenna elements are arranged side by side along an (X-) line extending in the first (X-) plane, wherein the shape of the reflector surface in a Cartesian coordinate system, with its origin in the vertex of the reflector, is defined as follows:z=x24⁢Fx+y24⁢Fy wherein z coincides with the optical axis, x coincides with the extension of the first (X-) plane and y coincides with the extension of the second (Y-) plane and Fx is the distance of the first (X-) focal plane from the vertex of the reflector and Fy is the distance of the second (Y-) focal lane from the vertex of the reflector, said (X-) line extending at the height of the second (Y-) focal plane.