The Indian Regional Navigation Satellite System (IRNSS) plans to expand to a global version in the long term. Japan's Quasi-Zenith Satellite System (QZSS) is a (US) GPS satellite-based augmentation system to enhance the accuracy of GPS, with satellite navigation independent of GPS scheduled for 2023. As of September 2020, the United States' Global Positioning System (GPS), Russia's Global Navigation Satellite System ( GLONASS), China's BeiDou Navigation Satellite System, and the European Union's Galileo are fully operational GNSSs. Satnav systems operate independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the positioning information generated.Ī satellite navigation system with global coverage may be termed a global navigation satellite system ( GNSS). These uses are collectively known as Positioning, Navigation and Timing (PNT). The signals also allow the electronic receiver to calculate the current local time to a high precision, which allows time synchronisation. The system can be used for providing position, navigation or for tracking the position of something fitted with a receiver (satellite tracking). It allows satellite navigation devices to determine their location ( longitude, latitude, and altitude/ elevation) to high precision (within a few centimetres to metres) using time signals transmitted along a line of sight by radio from satellites. A satellite navigation or satnav system is a system that uses satellites to provide autonomous geo-spatial positioning.
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