ABSTRACT
To understand the GNSS technology better, we need to have foundational knowledge of the GNSS receivers—the architecture, signal acquisition, and processing techniques of received signals. This chapter explains all these topics in great detail. It also includes classification of receivers and their descriptions, receiver independent exchange format, and all the factors necessary to consider before procuring a GNSS receiver for a specific application. The chapter also documents the commercial GNSS receiver manufacturers. Nowadays every smartphone carries a GNSS receiver that supports one or more GNSS constellations. This was implemented primarily for navigation purposes. However, in recent years, several apps have been developed to support GIS data collection and tracking in mobile phones. This chapter will also shed some light on these mobile apps.
