When GPS (global positioning system) was made commercially available in the year 2000, it launched a new era of satellite navigation services and technologies as dramatic as a spacecraft launch itself. This authoritative work gives engineers a timely, unified analysis of the various satellite navigation technologies, applications, and services now in operation or development. It describes the entire GPS system in detail, including features of the next-generation GPS-III, and brings readers up to speed on the developing European GALILEO system and its innovative characteristics. The book examines the architectures paving the way for the future integration of satellite navigation systems with wireless communications systems, and for interoperability among different satellite navigation systems themselves.