Citation
Abstract
In very long baseline interferometry (VLBI) applications, the measurements of geophysical/astrometric quantities and clock synchronization are degraded by unknown and unstable phase effects due to instrumentation. Most of these phase effects can be removed through the use of a tone generator that injects near the front of the instrumentation a set of tones derived from the station frequency standard. When properly used, such a calibration technique will not only remove post-injection instrumental phase instabilities, but will also allow absolute calibration of interferometer phase so that clock synchronization is possible. As implied, these advantages of the tone generator pertain only to instrumental effects after the injection point. This report presents a nonrelativistic mathematical model to describe the calibration signal, its processing, and its use in removing instrumental effects from interferometer phase.
Details
- Volume
- 42-44
- Published
- April 15, 1978
- Pages
- 63–74
- File Size
- 1.0 MB