The 64-m antenna automatic subreflector focusing controller
Abstract
Defocussing of the radio frequency beam arises from gravity-induced structural deformations as the 64 m Deep Space Network antenna rotates about the elevation axis. The subreflector controller generates the axial (z) and lateral (y) offset corrections necessary to move the subreflector, thus minimizing the gain losses due to this defocussing. The technique used to determine these offset errors is discussed, and a description of the new subreflector controller is presented.
- Publication:
-
The Telecommunications and Data Acquisition Report
- Pub Date:
- August 1984
- Bibcode:
- 1984tdar.nasa...73G
- Keywords:
-
- Amplification;
- Antennas;
- Automatic Control;
- Controllers;
- Deep Space Network;
- Defocusing;
- Deformation;
- Gravitational Effects;
- Radio Frequencies;
- Subreflectors;
- Block Diagrams;
- Focusing;
- Least Squares Method;
- Structural Analysis;
- Superhigh Frequencies;
- Communications and Radar