Beam compression process for antenna pattern
AssigneeNational Space Development Agency
InventorToshihiro Sezai
Life of this patent
Estimating the term…
Abstract
A beam of a main antenna is scanned at a constant speed in the direction of compression of the beam width over the range of from (c-a) degree to (c+a) degree with an arbitrary angle c set as a reference angle, and a beam of a sub antenna is scanned by using a phase shifter at a constant speed in the direction of compression of the beam width over the range of from (c-b) degree to (c+b) degree where b represents an angle corresponding to the first zero point of a pattern of the sub antenna and larger than the 1/2 scan angle a of the main antenna. Received signals of both the antennas obtained by the beam scans are subjected to an in-phase multiplication process in a multiplying circuit for beam compression of the received pattern of the main antenna.
Claims15
A beam compression process for an antenna pattern comprising the steps of:
- providing an antenna system made up of a main antenna for receiving a radio wave and at least one sub antenna which is adjacent said main antenna in the direction where a beam width of said main antenna is to be compressed and which has a beam axis coincident with a beam axis of said main antenna;
- scanning a beam of said main antenna at a constant speed in said direction of compression of the beam width over a range of from (c-a) degree to (c+a) degree with an arbitrary angle c set as a reference angle, and scanning a beam of said sub antenna at a constant speed for the same period as the scan of said main antenna in said direction of compression of the beam width over a range of from (c-b) degree to (c+b) degree where b represents an angle corresponding to a first zero point of an antenna pattern of said sub antenna and larger than said angle a;
- repeating the beam scans of said main antenna and said sub antenna while shifting the reference angle c in units of 2a degree successively;
- and
- executing an in-phase multiplication process of received signals of said main antenna and said sub antenna obtained by said beam scans.
Dependencies are inferred from the claim text.