Citation
Abstract
The polarization clock angle of a linearly polarized paraboloidal antenna is a function of both its secondary pattern characteristics and the pointing error relative to the antenna axis of revolution. For polarization tracking scientific experiments such as those planned in support of Project Helios, it is necessary to have an understanding of the relationship between the feed system polarization clock angle (a physically measured quantity) and the overall antenna polarization clock angle. In particular, the S- and X-band reflex feed system introduces significant antenna beam asymmetry which gives rise to polarization error. In this reporting, the DSS 14 64-m antenna secondary pattern characteristics are developed as a function of the reflex feed characteristics previously reported. The polarization angle error is computed as a function of antenna pointing error, typical antenna open-loop pointing errors are reviewed, and the expected polarization distortion is given. E(6,¢) = 2 Eone (0) sin (md) (even) Ey (0, ¢) = 2 Egme (8) cos (md) (even) Ey (0,6) = Eo (0,6) cos 6 cos¢ — Eg (8,¢)singd (2a) Ey (9,6) = Eo (0, 6) cos @ sing + Ey (6,6) cos (2b) Ex (6, 6) = Exo (6, 6) cos (at) (3a)
Details
- Volume
- XVII
- Published
- October 15, 1973
- Pages
- 28–38
- File Size
- 693.9 KB