Fundamentals.of.Global.Positioning.System.Receivers.A.Software.Approach

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Copyright  2005 by John Wiley & Sons, Inc., Hoboken, New Jersey. All rights reserved.
Published simultaneously in Canada.
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For general information on our other
The purpose of this book is to present detailed fundamental information on a
global positioning system (GPS) receiver. Although GPS receivers are popularly
used in every-day life, their operation principles cannot be easily found in one
book. Most other types of receivers process the input signals to obtain the necessary
information easily, such as in amplitude modulation (AM) and frequency
modulation (FM) radios. In a GPS receiver the signal is processed to obtain the
required information, which in turn is used to calculate the user position. Therefore,
at least two areas of discipline, receiver technology and navigation scheme,
are employed in a GPS receiver. This book covers both areas.
In the case of GPS signals, there are two sets of information: the civilian code,
referred to as the coarse/acquisition (C/A) code, and the classified military code,
referred to as the P(Y) code. This book concentrates only on the civilian C/A
code. This is the information used by commercial GPS receivers to obtain the
user position.
The material in this book is presented from the software receiver viewpoint
for two reasons. First, it is likely that narrow band receivers, such as the GPS
receiver, will be implemented in software in the future. Second, a software
receiver approach may explain the operation better. A few key computer programs
can be used to further illustrate some points.
This book is written for engineers and scientists who intend to study and
understand the detailed operation principles of GPS receivers. The book is at the
senior or graduate school level. A few computer programs written in Matlab are
listed at the end of several chapters to help the reader understand some of the
ideas presented.
I would like to acknowledge the following persons. My sincere appreciation
to three engineers: Dr. D. M. Akos from Stanford University, M. Stockmaster
from Rockwell Collins, and J. Schamus from Veridian. They worked with me
at the Air Force Research Laboratory, Wright Patterson Air Force Base on the
xv
xvi PREFACE TO THE FIRST EDITION
design of a software GPS receiver. This work made this book possible. Dr. Akos
also reviewed my manuscripts. I used information from several courses on GPS
receivers given at the Air Force Institute of Technology by Lt. Col. B. Riggins,
Ph.D. and Capt. J. Requet, Ph.D. Valuable discussion with Drs. F. VanGraas and
M. Braasch from Ohio University helped me as well. I am constantly discussing
GPS subjects with my coworkers, D. M. Lin and V. D. Chakravarthy.
The management in the Sensor Division of the Air Force Research
Laboratory provided excellent guidance and support in GPS receiver
research. Special thanks are extended to Dr. P. S. Hadorn, E. R. Martinsek,
A. W. White, and N. A. Pequignot. I would also like to thank my colleagues,
R. L. Davis, S. M. Rodrigue, K. M. Graves, J. R. McCall, J. A. Tenbarge, Dr.
S. W. Schneider, J. N. Hedge Jr., J. Caschera, J. Mudd, J. P. Stephens, Capt.
R. S. Parks, P. G. Howe, D. L. Howell, Dr. L. L. Liou, D. R. Meeks, and
D. Jones, for their consultation and assistance.
Last, but not least, I would like to thank my wife, Susan, for her encouragement
and understanding.

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