Westford Radio Telescope

The Westford Radio Telescope is a primary geodetic very long baseline interferometry (VLBI) site located 45 minutes northwest of Boston, Massachusetts.

The Westford telescope was constructed in 1961 as part of Project West Ford at Lincoln Laboratory, to demonstrate the feasibility of long-distance communication by bouncing radio signals off a spacecraft-deployed belt of copper dipoles at an altitude of 3,600 km.

Westford was converted to geodetic use in 1981 as one of the first two VLBI stations of Project POLARIS (National Geodetic Survey [NGS]) and has participated in geodetic VLBI observations on a regular basis ever since.

The site also serves as a testbed for the development of significant new equipment and techniques now employed in geodetic VLBI worldwide, and has also been a GNSS fiducial point since the 1990s.

Westford is a fundamental station for the broadband VLBI Global Observing System (VGOS), the next-generation VLBI network. VGOS will support all aspects of earth system observations, and will enable sea-level measurements with an accuracy about 10 times greater than current capabilities.

Westford is a station of the expanding VGOS network of the NASA Space Geodesy Project (SGP). Observations with the NASA VGOS network in collaboration with partners from the International VLBI Service for Geodesy and Astrometry (IVS) will contribute to the determination of earth’s shape and rotation with unprecedented accuracy.