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发表于 2007-12-26 14:33:05
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Preface
The purpose of this book is to introduce digital signal processing approaches
that are potentially applicable to wideband receiver designs. The emphasis is on
techniques rather than theoretical discussions. Since the final goal in receiver design
is to process the input data in near real time, the calculation speed of these
processing methods is of primary concern.
Digital signal processing has been widely applied in many technical areas. In
the past, digital signal processing has been used after crystal detectors in electronic
warfare (EW) receivers. The technology advances in analog-to-digital converters
(ADCs) opens a new era in receiver design. The ADC can replace the crystal detector
and keep valuable information that would otherwise be lost after detection.
The requirements of EW and communication used to be different. EW receivers
require a very wide bandwidth and communication receivers require a relatively
narrow bandwidth. However in recent years, the requirements in these two areas
have become more closely aligned. The most significant requirements are wide
input bandwidth coverage and high dynamic range in both types of systems. As a
result, many techniques that were previously considered unique for EW receivers
are now applicable to communication systems also.
This book is divided into 16 chapters. Chapter 1 is an introduction. Chapters
2 and 16 are the only chapters devoted to electronic warfare. Chapter 2 provides
a very brief review of EW and Chapter 16 discusses the evaluation of EW receivers.
Fourier transforms, discrete Fourier transforms, and some related subjects that are
especially interesting for wide bandwidth receiver designs are included in Chapters
3, 4, and 5. Chapters 6 through 8 concern receiver hardware. Chapter 6 discusses
ADCs and their impact on receiver performance. Chapter 7 shows the design of
receiver front-ends with ADCs at the outputs. Chapter 8 discusses in-phase and
quadrature-phase converter designs. Probability of false alarm and probability of
detection are discussed in Chapter 9. Phase measurement and zero crossing methods
to measuring frequency are discussed in Chapter 10. Chapters 11 through 14
discuss methods closely related to receiver designs. Chapter 11 discusses frequency
channelization. Chapter 12 presents a simple design of an EW receiver. Chapter
13 presents some possible methods to process signals after channelization. High
frequency resolution is discussed in Chapter 14. Angle measurements are discussed
in Chapter 15.
This book is written at a senior or graduate school engineering level. It is
written for researchers in the electronic warfare and communication areas. In order
to help the readers to understand the subjects, many examples are included. Many
computer programs are also included to further illustrate some of the ideas.
The author has very much appreciated valuable discussions with Dr. William
McCormick and Dr. Arnab Shaw from Wright State University and Dr. Richard
Sanderson from Air Force Research Laboratory. Special thanks to two engineers:
Mr. David Sharpin from Air Force Research Laboratory and Mr. Timothy Fields
from System Research Laboratory for their technical discussions. I am in debt to
Mr. Rudy Shaw, Mr. Anthony White, Mr. Emil Martinsek, Mr. William Moore and
Dr. Paul Hadorn from Air Force Research Laboratory for their encouragement. I
would also like to thank many of my colleagues: Mr. Robert Davis, Mr. Joseph
Caschera, Mrs. Debbie Abies, Mr. Nicholas Pequignot, Mr. James Hedge, Capt.
Daniel Zahirniak, Lt. Christine Montgomery, Mr. Scott Rodrique, Mr. Keith Graves,
Mr. John McCaIl, Mr. Joseph Tenbarge, Dr. Steve Schneider, Mr. David Jones,
Ms. Darnetta Meeks, Mr. Vasu Chakravarthy, Mr. Keith Jones, Lt. Jamie Marciniec,
Lt. George Dossot, Lt. Jason Shtrax, Cap. Daniel Richards, Mr. Ed Culpepper from
Air Force Research Laboratory, and Mr. James McCartney, Mr. Jerry Bash, Mr. Mark
Thompson, and Mr. Jeff Wagenbach from System Research Laboratory.
Last, but not least, I wish to thank my wife, Susan, for her encouragement
and understanding of my spending lots of time on this book. |
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