TechnologyObserving FacilitiesEducation and OutreachAbout Haystack

Geodesy

Geodesy and geophysics are concerned mostly with what is going on under our feet, so it may seem ironic that these two disciplines are advanced by looking up at the stars! VLBI techniques, which were originally developed for studying radio objects in the universe can, in effect, be turned upside down to do very precise studies of the Earth.

geodesign Studies
Geodetic studies help aid in the use of GPS and other navigational equipment.

By simultaneously collecting data from a single radio source via a worldwide array of radio telescopes, the relative time-of-arrival of signals from that source to each telescope can be determined to within a few picoseconds (3 picoseconds = 1 mm of light travel time). By observing many radio sources spread widely over the sky over a period of 24 hours, data are collected that allow the ultra-precise measurements of the Earth and its orientation in space. The geodetic VLBI techniques in use at Haystack originated more than three decades ago at the Observatory, which continues to lead the way in new developments and improved accuracy in these important research methods.

Geodetic VLBI in Action

Among the important applications of geodetic VLBI are:

Quick Links
HOME  |  CONTACT  |  DIRECTIONS  |  WEATHER  |  INTRANET  |  SITEMAP  |  SEARCH
Astronomy

Science

Haystack Radio Telescope

Wideband VLBI

Radio Arrays (MWA, SKA, MAPS, Deuterium)

Small Radio Telescope (SRT)

Publications

Geodesy

Science

Westford Radio Telescope

Mark 4 VLBI Correlator

VLBI Technique Development

International VLBI Service (IVS)

Publications

Atmospheric Sciences

Science

Millstone Hill Observatory

Madrigal

Array Systems

Open Source Projects

Space Science Resources

Publications

Technology

Radio Arrays (MWA, SKA, MAPS, Deuterium)

Very Long Baseline Interferometry (VLBI)

Ionospheric Techniques

Open Source Projects

Observing Facilities

Haystack Radio Telescope

Westford Radio Telescope

Millstone Hill Radar

Deuterium Array

Atmospheric Optics Facility

Education and Outreach

Undergraduate Research

Research Experiences for Undergraduates (REU)

Research Experiences for Teachers (RET)

Pre-College Resources

Public Outreach Activities

About Haystack

Northeast Radio Observatory Corp. (NEROC)

Publications

News Archive

Glossary

Staff

Positions Available

Art at Haystack

History

Computing

Library

Networks

Safety Manual

Seminars

CloseSEARCH: