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Most texts on electromagnetic theory follow the classical approach
of steady state solutions of Maxwell's equations. In Interstellar
Propagation of Electromagnetic Signals, the authors, H. Harmuth and
K. Lukin, point out the deficiencies in Maxwell's theory and
present an exciting new way of obtaining transient or signals
solutions. This book can be used by researchers, graduate students
and scientists in the areas of physics, astrophysics, astronomy and
electromagnetic theory or electromagnetics.
Electromagnetic Signals deals with the practical applications of
nonsinusoidal electromagnetic waves or carrier free radars,
ultrawideband technology and large relative bandwidth technology.
The book is unique since it deals with a number of current
conventional radar problems along with proposed solutions.
The orthogonality of functions has been exploited in communications
since its very beginning. Conscious and extensive use was made of
it by Kotel'nikov in theoretical work in 1947. Ten years later a
considerable number of people were working in this field. However,
little experimental use could be made of the theoretical results
before the arrival of solid state operational amplifiers and
integrated circuits. The advantages of Walsh functions, which are
emphasized in this book, were recognized independently by several
scientists in the early sixties. Among them were E. Gibbs, K.
Henderson, F.Ohnsorg, G. Sandy and E. Vandivere, whose work was not
published until many years later. Somewhat more than half the
illustrations in this second edition were not contained in the
first edition and this reflects the changes in contents. The most
striking difference between the two editions is the progress toward
practical applications made in the intervening three years.
However, it may turn out that the most important change is one that
appears rather theoretical on the surface and that concerns
shift-invariant features strongly connected with sine-cosine
functions. These functions are projections of the exponential
function which, in turn, is the character group of the real
numbers. The topology of the real numbers is generally accepted to
be the same as that of time or a one-dimensional space, and this is
the basis for a variety of claims that sinusoidal functions are
unique and superior to all others.
Most texts on electromagnetic theory follow the classical approach
of steady state solutions of Maxwell's equations. In Interstellar
Propagation of Electromagnetic Signals, the authors, H. Harmuth and
K. Lukin, point out the deficiencies in Maxwell's theory and
present an exciting new way of obtaining transient or signals
solutions. This book can be used by researchers, graduate students
and scientists in the areas of physics, astrophysics, astronomy and
electromagnetic theory or electromagnetics.
Electromagnetic Signals deals with the practical applications of
nonsinusoidal electromagnetic waves or carrier free radars,
ultrawideband technology and large relative bandwidth technology.
The book is unique since it deals with a number of current
conventional radar problems along with proposed solutions.
The orthogonality of functions has been exploited in communications
since its very beginning. Conscious and extensive use was made of
it by KOTEL' NIKOV in theoretical work in 1947. Ten years later a
considerable number of people were working in this field rather
independently. However, little experimental use could be made of
the theo retical results before the arrival of solid state opera
tional amplifiers and integrated circuits. A theory of
communication based on orthogonal functions could have been
published many years ago. However, the only useful examples of
orthogonal functions at that time were sine-cosine functions and
block pulses, and this made the theory appear to be a complicated
way to derive known re sults. It was again the advance of
semiconductor techno logy that produced the first really new,
useful example of orthogonal functions: the little-known Walsh
functions. In this book emphasis is placed on the Walsh functions,
since ample literature is available on sine-cosine func tions as
well as on block pulses and pulses derived from them."
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