GNSSteknologiat

GNSSteknologiat refers to Global Navigation Satellite Systems technologies. These systems are satellite-based radio navigation systems that provide autonomous geospatial positioning with global coverage. GNSS receivers on Earth's surface can determine their location by calculating their distance from at least four satellites. The time it takes for a signal to travel from a satellite to the receiver is used to calculate this distance.

The most well-known GNSS is the United States' Global Positioning System (GPS), which has been operational since the 1970s. Other major GNSS include Russia's GLONASS, Europe's Galileo, and China's BeiDou. Each system consists of a constellation of satellites orbiting Earth, a ground control segment for monitoring and management, and user receivers.

GNSS technologies have revolutionized navigation and location-based services. Applications range from everyday uses like car navigation and smartphone mapping to critical functions in aviation, maritime transport, surveying, agriculture, and disaster management. The accuracy of GNSS positioning can be further enhanced through augmentation systems, such as differential GPS (DGPS) or the Satellite-Based Augmentation System (SBAS), which use ground-based reference stations or additional satellites to correct for atmospheric delays and other errors. The continuous development of GNSS technologies aims to improve accuracy, reliability, and availability, enabling even more sophisticated applications in the future.