A system which provides autonomous geospatial positioning by using satellites is referred to as a satellite navigation system. It helps small electronic receivers in determining their location including their latitude, altitude and longitude to a high precision. The location is determined by transmitting time signals along a line of sight by radio devices from satellites. A satellite navigation system which provides a global coverage is known as a global navigation satellite system (GNSS). The primary functions of these systems are to help in navigation, determining the exact position and tracking the position of any object. Some of the categories in which the global navigation satellite systems can be divided are core satellite navigation systems, Continental scale Ground Based Augmentation Systems (GBAS), Global Satellite Based Augmentation Systems (SBAS), Regional Satellite Navigation Systems, etc. This book outlines the processes and applications of global navigation satellite systems in detail. It elucidates the concepts and innovative models around prospective developments with respect to GNSS. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.