Telescope surface measurement with two feeds
| Autor: | S. von Hoerner |
|---|---|
| Rok vydání: | 1978 |
| Předmět: |
Parabolic antenna
Physics Paraboloid Cassegrain antenna Parabolic reflector business.industry Offset dish antenna Astrophysics::Instrumentation and Methods for Astrophysics Feed horn Condensed Matter Physics law.invention Telescope Radio telescope Optics law Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Antennas and Propagation. 26:857-860 |
| ISSN: | 0096-1973 |
| DOI: | 10.1109/tap.1978.1141948 |
| Popis: | A method is suggested where a reference feed is fixed at the telescope focus, and a second feed has a lateral offset and scans the focal plane. The telescope tracks a celestial radio source, and the receiver measures the phase difference at the two feeds and their (voltage) amplitude ratio. A set of coordinate transformations is applied, after which the surface deviations \sigma from a paraboloid can be obtained by a Fourier transform. The measuring error is discussed, and the best wavelength is found to be between 14 and 21 rms \sigma . |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|