VLBI collimation tower technique for time-delay studies of a large ground station communications antenna
Abstract
A need for an accurate but inexpensive method for measuring and evaluating time delays of large ground antennas for VLBI applications motivated the development of the collimation tower technique. Supporting analytical work which was performed primarily to verify time delay measurement results obtained for a large antenna when the transmitter was at a collimation distance of 1/25 of the usual far field criterion is discussed. Comparisons of theoretical and experimental results are also given.
- Publication:
-
The Telecommunications and Data Acquisition Report
- Pub Date:
- February 1983
- Bibcode:
- 1983tdar.nasa...20O
- Keywords:
-
- Collimation;
- Microwave Antennas;
- Time Lag;
- Very Long Base Interferometry;
- Deep Space Network;
- Far Fields;
- Ground Stations;
- Communications and Radar