Establishing first-order control by GPS satellite surveying instruments

A totally new, revolutionary Global Positioning System (GPS) satellite surveying instrument is now available to establish first-order (and less accurate) geodetic horizontal control over both short and long distances. This instrument has been tradenamed the MACROMETER Interferometric Surveyor. The MACROMETER instrument receives and processes the GPS satellite signals, using radio interferometric techniques in a way that produces (1:100,000) accuracy. Optimum use of this system results when three or more MACROMETER instruments simultaneously observe satellite signals. Conceptually, the MACROMETER instrument can be thought of as a total station which measures precise distance, azimuth, and vertical angle from a known to an unknown point, and also has the capability to measure through intervening obstructions.