I wanted to form a multidisciplinary team of individuals whose expertise in relevant areas would provide a thorough treatment of key GPS aspects. My motivation for compiling this work was that a GPS book that addressed the needs of the engineering/scientific community did not exist. Information was available in the form of technical papers or texts specializing in survey applications; however, there was no single text available that provided the reader with a complete systems engineering treatment of the subject matter. In this edition, I have attempted to provide the necessary material to ensure a broad but comprehensive treatment of GPS. In addition to GPS, the Russian GLONASS system and forthcoming INMARSAT overlay are also covered.

The book has been structured such that a reader with a general science background can learn the basics of GPS and how it works within the first few chapters, whereas, the reader with a stronger engineering/scientific background will be able to delve deeper and benefit from the more in-depth technical material. I believe it is this "ramp up" of mathematical/technical complexity along with the treatment of key topics that will allow this publication to serve as a student text as well as a reference source.

While the book has generally been written for the engineering/scientific community, one full chapter is devoted to GPS markets and applications. This latter material is intended for sales and marketing personnel to forecast the multibillion dollar market associated with satellite navigation based products and services.

Chapter 1 serves as an introduction to the text while Chapter 2 presents the fundamentals of position, velocity, and time determination using GPS. A description of GPS system architecture is presented in Chapter 3. Chapters 4, 5, and 6 address satellite signal generation, receiver signal acquisition and tracking, and receiver operation in the presence of RF interference, respectively. Standalone GPS performance is covered in Chapter 7 while differential techniques are addressed in Chapter 8. In Chapter 9, the integration of GPS and other sensors is discussed. The Russian GLONASS system is described in Chapter 10. The INMARSAT geostationary overlay is discussed in Chapter 11. Chapter 12 focuses on GPS markets and applications.

As mentioned above, this text was compiled by individuals with expertise in the various aspects of GPS. Unlike other books where the authors may have collaborated to form a particular chapter, that was not the case in this writing (wit one exception). Each author either wrote an entire chapter, a specific section, or in tiple sections. This made my job as editor somewhat more difficult, but I believe th this has resulted in a significant contribution to the engineering/scientific community. Although at times the experience was quite trying, it was generally a pleasure working with such a high caliber of individuals. Each author illuminated each topic with his or her expertise. Mike Pavloff generated the section on fundamentals of satellite orbits; Joe Leva wrote sections addressing user velocity determination and posit on error analyses as well as the appendix on least squares; Larry Wiederholt gener ed the sections on GPS system architecture; Phil Ward authored the chapters on satellite signal generation, signal acquisition and tracking, and receiver operation in an interference environment; Maarten Uilt de Haag provided text on pseudorange measurement errors; and Karen Van Dyke addressed standalone availability and integrity. Local and wide area code-based differential GPS (DGPS) techniques were covered by Ron Cosentino, while Dave Diggle addressed local area DGPS carrier phase measurements. GPS/inertial integration was written by Mike Foss, with Jeff Geier providing sections on multisensor integration for automotive applications. GLONASS was covered by Richard Clark, Scott Feairheller, and Jay Purvis. Jim Nagle and Ron Cosentino wrote the INMARSAT chapter. Markets and applications were put forth by Scott Lewis. In addition to coordinating the effort and editing the text, I was responsible for authoring the introductory chapter. I also wrote sections pertaining to user position and time determination as well as user receiving equipment. In closing, the opinions presented here are those of the authors and do not reflect the views of the MITRE Corporation.