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Deformable subreflector computed by geometric optics
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Katow, M. S. Williams, W. F. Khan, I. |
| Copyright Year | 1983 |
| Description | Using a Cassegrainian geometry, the 64-meter antenna with its distorted paraboloidal reflecting surface is forced to produce a uniform phase wavefront by a pathlength-compensating subreflector. First, the computed distortion vectors at the joints or nodes of the main reflector structure supporting the surface panels are best fitted to a paraboloid. Second, the resulting residual distortion errors are used to determine a compensating subreflector surface by ray tracing using geometric optics principles. Third, the totally corrected subreflector surface is defined by the normal directions and distances to the surface of the original symmetric hyperboloid for the purpose of evaluation. Finally, contour maps of distortions of the paraboloid reflector and the compensating subreflector are presented. A field-measured check of the subreflector in focused position as computed by the described methodology is also presented for the antenna position at horizon look with the geometry at 45 degrees elevation. |
| File Size | 584437 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840005339 |
| Archival Resource Key | ark:/13960/t48q0vb9s |
| Language | English |
| Publisher Date | 1983-11-15 |
| Access Restriction | Open |
| Subject Keyword | Optics Computer Programming Subroutines Wave Front Deformation Error Functions Ray Tracing Mathematical Models Subreflectors Cassegrain Antennas Parabolic Reflectors Cartesian Coordinates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
