Citation
Abstract
JPL is building a mobile surveying instrument in support of the NASA crustal dynamics program. This instrument will measure the length and direction of the distance between sites on the Earth’s surface. This is done using Very Long Baseline Interferometry techniques operating at microwave frequencies using extragalactic radio sources (QUASARS). One of the subsystems is the Frequency and Timing Subsystem. The frequency standard used is a hydrogen maser, which is the most stable operational frequency standard in the world today. It is also a device which is sensitive to its environment, so great care must be taken in installation and operation. An important part of the subsystem is a sophisticated automatic system to monitor frequency stability and accumulated clock error.
Details
- Volume
- 42-62
- Published
- April 15, 1981
- Pages
- 3–9
- File Size
- 456.8 KB