Global Positioning System (GPS) - SS1 ICT Lesson Note
The Global Positioning System (GPS) is a satellite-based navigation system that enables precise location determination and navigation on Earth. It was developed and is maintained by the United States government. The GPS system consists of a constellation of satellites orbiting the Earth, ground-based control stations, and user devices. It finds applications in navigation, location-based services, mapping, surveying, and more.
Source:(spaceplace.nasa.gov)
Key features of GPS include:
- Satellite Constellation: GPS operates using a network of at least 24 satellites that transmit signals containing time and location information.
- Trilateration: GPS receivers determine their location by calculating the distance between themselves and multiple satellites through trilateration, a geometric process.
- Accuracy: GPS provides highly accurate positioning information, typically within a few meters or better, depending on the quality of the receiver and conditions.
- Navigation: GPS enables navigation by providing real-time positioning information, speed, and direction to users, whether they are on foot, in vehicles, or even in aircraft.
- Applications: GPS has widespread applications, including navigation for vehicles, marine vessels, and aircraft, location-based services, mapping, surveying, geocaching, and scientific research.
- Augmentation Systems: Various augmentation systems exist to enhance GPS accuracy and availability, such as WAAS (Wide Area Augmentation System) and DGPS (Differential GPS).
GPS has become an integral part of modern life, powering everything from navigation apps on smartphones to guiding complex military operations and scientific research