Advances in Global Positioning System Technology for Geodynamics Investigations: 1978–1992

Over the last decade, users of the Global Positioning System (GPS) have developed the technology capable of meeting the stringent requirements to study geodynamics signals. Positioning precision is currently at the millimeter level on local scales (-10 h). and at the centimeter level on global scales (-10,000 km). Now that the GPS constellation is nearing completion and techniques are maturing, the doors are open to deeper investigations of geophysical phenomena covering a broad temporal and spatial spectrum. After a decade of great strides in improving geodetic precision, the focus is moving to operational systems and quality control. Several GPS analysis groups are now routinely estimating Earth polar motion parameten and geocentric coordinates of 20-30 stations on a daily basis with centimeter accuracy, besides providing precise estimates of GPS satellite positions to support regional geodynamics investigations. Within the next few years, this analysis will grow to include the computation of geocentric coordinates for -200 stations, every day. Hence, GPS will allow us to view the Earth as a 200-vertex, deforming, rotating polyhedron.

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