This textbook provides fundamental theory and application of satellite communications and networks in a format suitable for university students and professionals working in the field. The book first outlines the types of satellites and their uses, then goes on to cover satellite orbits and constellation design; satellite system architecture; air interface and physical layer; and integrated satellite-terrestrial networks. A thorough discussion on 5G and 6G non-terrestrial networking (NTN) is included. The book shows how and why satellites are playing a key role in supporting critical...