Abstract
Ahead of an upgrade to X-band, the 60-foot antenna on the Johns Hopkins University Applied Physics Laboratory campus in Laurel, Maryland was surveyed in several orientations by close-range digital photogrammetry. Seven hundred and thirty-eight retroreflective targets were placed in a regular pattern across the dish panels and eight more on the feed, two per side. The measured properties were the changes in dish shape, in the feed's position relative to the dish and in the feed's angle relative to the dish, as the antenna moved through its range. John Troll sets out the measurement requirements and plan, the surveys completed, the dish shape and feed motion results, and how they compared with the analytical predictions.
Also published as CMSJ-03-1-01, The Journal of the CMSC, Volume 3, Number 1 (Spring 2008).
Cite this paper
John Troll, Bob Stillwell, David Persons, Russell Morrison. Johns Hopkins University Applied Physics Laboratory, Laurel, MD; Geodetic Systems, Inc. Presented at the Coordinate Metrology Systems Conference 2007, Reno, Nevada, July 16-20, 2007. Coordinate Metrology Society, reference CMS-2007-014.