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As with previous editions, this textbook provides a broad coverage of modern satellite communications, but with the passing of Professor Emeritus Dennis Roddy, this fifth edition has been significantly updated by Professors W. Linwood Jones and David G. Long, who individually have more than 40 years of experience in RF/microwave research and undergraduate and graduate education in satellite communications, radar, and microwave remote sensing. Compared to the fourth edition, significant changes have been made to reflect the transition of current satellite systems to digital communications, while maintaining the presentation of analog and digital legacy systems in operation. The introduction of new material promotes better understanding of satellite link analysis with many new figures and numerical examples added. Of the 17 chapters, five, namely: Chap. 5—Polarization, Chap. 8—The Earth Segment, Chap. 9—Analog Signals, Chap. 11—Error Control Coding, and Chap. 16— Direct Broadcast Satellite (DBS) Television, are essentially unchanged. However, the remaining 12 chapters were revised as follows: Chapter 1—Overview of Satellite Systems: provides updates to the communications satellite launches since 2000, and a presentation of the current satellite search and rescue system. Chapter 2—Orbits and Launching Methods: removes outdated references to Space Shuttle satellite launches, expands the discussion of expendable rocket launches, introduces reusable first-stage boosters, and new numerical examples of GEO launch scenarios are given. Chapter 3—The Geostationary Orbit: two new sections on antenna pointing geometry are introduced, with five additional examples and two new homework problems. Chapter 4—Radio Wave Propagation: Increased emphasis on rain absorption effects with three new sections and two new homework problems. Chapter 6—Antennas; three new sections concerning the calculation of satellite antenna line-of-sight gain, five new examples, and five new homework problems. Chapter 7—The Space Segment: updated five sections (including two new) giving expanded satellite subsystem discussion, and added one homework problem. Chapter 10—Digital Signals: updated and expanded the scope of four sections, with 10 new figures and two new examples. Chapter 12—The Space Link: introduced an improved method of treating losses with major changes to all sections, including nine new sections, 14 new figures, seven new examples, and three new homework problems. Chapter 13—Interference: minor changes with two new figures and one new example. Chapter 14—Satellite Access: updated method of treating losses, addition of five new numerical examples and two new homework problems. Chapter 15—Satellites in Networks: major update of presentation of satellite Internet services with three new sections added. Chapter 17—Satellite Mobile and Specialized Services: updated five sections to remove outdated material and to include modern mobile SATCOM services. Added two Appendices, G and H.