Principles of satellite navigation system

Abstract

Satellite navigation is the technology that uses navigation satellites to transmit positioning signals, in order to provide real-time positioning for users in the air, on the ground, at sea, and in space. Since it can provide high-precision information such as three-dimensional position, velocity and time (PVT) for any location and on any people and objects, it has unparalleled advantages over other navigational technologies. Thus, it can be widely applied in civil fields such as transportation, surveying, mapping, telecommunications, water conservancy, fishery, forest fire prevention, disaster reduction, and disaster relief. It can also be used in military fields such as aerospace and weapon guidance. Consequently, the satellite navigation system has become a keystone for a country’s space information infrastructure, and an important indicator to reflect its status as a modern country, a great power, and the country’s comprehensive national strength. Major countries and organizations all around the world have been vigorously developing satellite navigation systems with various characteristics.