Understanding GPS Technology and Augmentations
Global Positioning System (GPS) utilizes a constellation of satellites to accurately determine device locations on Earth. The system consists of 24 satellites orbiting the planet, with an orbital configuration ensuring worldwide coverage. GPS offers high accuracy, with advancements like Differential GPS (DGPS) and Wide Area Augmentation System (WAAS) enhancing precision. Augmentation systems like Nationwide Differential GPS System (NDGPS) and International GNSS Service (IGS) further improve accuracy for various applications, including aircraft navigation. Overall, GPS technology continues to evolve for increased reliability and functionality.
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Presentation Transcript
GPS Navigation Global Positioning System (GPS)
Global Positioning System (GPS) Cloud of 24 GPS satellites orbit the Earth Satellite positions are accurately known GPS device receives satellite signal with time-sent information Device calculates distance to satellite Intersection point of multiple satellites defines device location
GPS Orbital Configuration 24 satellites 20,000 km (Approximately 12,500 mi) above Earth Orbits take 12 hours Cover entire Earth
GPS Accuracy Within 100 meters (328 ft) Original GPS Within 15 m (49 ft) Selective availability removed 3-5 m (10-16 ft) Differential position (GDPS) < 3 m (10 ft) Wide Area Augmentation System (WAAS)
GDOP - Geometric Dilution of Precision
GPS Augmentations Systems to increase GPS accuracy Nationwide Differential GPS System (NDGPS) Wide Area Augmentation System (WAAS) Continuously Operating Reference Station (CORS) Global Differential GPS (GDGPS) International GNSS Service (IGS)
NDGPS Nationwide Differential GPS System Accurately surveyed locations used for reference Corrects GPS for increased accuracy for users on land and water Developing system for 10-15 cm accuracy
WAAS - Wide Area Augmentation System Operated by FAA (U.S. Federal Aviation Administration) Aircraft navigation for all phases of flight
Benefits of WAAS Primary means of navigation More direct routes Approach with vertical guidance Decommission older equipment Simplify onboard equipment Increased capacity
