GPSGNSSjärjestelmiä

GPSGNSSjärjestelmiä refers to Global Navigation Satellite Systems. These are satellite-based radio-navigation systems that provide autonomous geospatial positioning with global coverage. Users with a receiver can determine their position anywhere on or near the Earth where there is an unobstructed line of sight to at least four GNSS satellites. The positioning accuracy depends on various factors including satellite geometry, atmospheric conditions, and receiver quality.

The most well-known GNSS is the United States' Global Positioning System (GPS), which is operated by the United States Space Force. Other major global systems include Russia's GLONASS, Europe's Galileo, and China's BeiDou. There are also regional systems such as Japan's Quasi-Zenith Satellite System (QZSS) and India's NavIC. These systems consist of a constellation of satellites orbiting the Earth, ground control stations for monitoring and management, and user receivers that calculate position based on the signals received.

GNSS technology has revolutionized navigation, transportation, surveying, and many other fields. It enables applications such as vehicle navigation, precision agriculture, emergency services, and scientific research. The continuous development of GNSS technology aims to improve accuracy, reliability, and availability, even in challenging environments.