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41 results for "channel sounding"
Channel Characterisation and System Design for Sub-Surface Communications By David Gibson
eBook (PDF): $54.62
Based on the author's PhD thesis, this book is a theoretical study of subterranean radio communication, with the focus on methods that depend primarily on the penetration of electromagnetic fields... More > through the ground. Through-the-earth communication using e-m fields - specifically magnetic induction - plays a role in search and rescue systems used in the mining industry. It is also used for borehole telemetry, pipeline location and by cavers and pot-holers. Chapters describe propagation, antennas, and the design of transmitters and receivers. A figure of merit - the specific aperture - is introduced as an aid to antenna design. A crucial aspect of all systems is the signal to noise ratio, for which the strategy of noise-matching is introduced. The design of a wide-band low-frequency sounder is described, for channel evaluation using a non-ideal binary sequence. A method of calculating the inverse of a generalised sequence is described, for which cross-correlation results in a system identification signal.< Less
Channel Characterisation and System Design for Sub-Surface Communications By David Gibson
Paperback: List Price: $308.09 $77.02 | You Save: 75%
Prints in 3-5 business days
Based on the author's PhD thesis, this book is a theoretical study of subterranean radio communication, with the focus on methods that depend primarily on the penetration of electromagnetic fields... More > through the ground. Through-the-earth communication using e-m fields - specifically magnetic induction - plays a role in search and rescue systems used in the mining industry. It is also used for borehole telemetry, pipeline location and by cavers and pot-holers. Chapters describe propagation, antennas, and the design of transmitters and receivers. A figure of merit - the specific aperture - is introduced as an aid to antenna design. A crucial aspect of all systems is the signal to noise ratio, for which the strategy of noise-matching is introduced. The design of a wide-band low-frequency sounder is described, for channel evaluation using a non-ideal binary sequence. A method of calculating the inverse of a generalised sequence is described, for which cross-correlation results in a system identification signal.< Less
Cave Radiolocation By David Gibson
eBook (PDF): $7.82
This book is a collection of essays on radiolocation in caves, and related topics. Most of the articles have previously been published in the journal of the Cave Radio and Electronics Group, a... More > special interest group of the British Cave Research Association. The topic is approached from a theoretical point-of-view, studying the mechanism of propagation of the fields, and how their measurement can be used to provide a location tool for use in cave surveying. In addition, other peripheral topics are covered, such as channel sounding, electronic measurement of clinometer angle and the copyright of cave surveys.< Less
Cave Radiolocation By David Gibson
Paperback: $19.49
Prints in 3-5 business days
This book is a collection of essays on radiolocation in caves, and related topics. Most of the articles have previously been published in the journal of the Cave Radio and Electronics Group, a... More > special interest group of the British Cave Research Association. The topic is approached from a theoretical point-of-view, studying the mechanism of propagation of the fields, and how their measurement can be used to provide a location tool for use in cave surveying. In addition, other peripheral topics are covered, such as channel sounding, electronic measurement of clinometer angle and the copyright of cave surveys.< Less
Exploring Atlantis By Frank Alper
eBook (PDF): $5.99
A complete edition of the trilogy “Exploring Atlantis”, presenting Frank Alper’s spiritually channelled lectures during 1980 through 1986 in Phoenix, AZ. A unique transmission of... More > knowledge about the ancient Atlanteans’ social, moral, sexual and spiritual customs and habits by Universal Masters such as Strength from Atlantis, Atemose II, Kryon, Pythagoras and others. A large part of the book is dedicated to the function and use of quartz crystals by the Atlanteans. Patterns of crystals for healing applications are explained throughout the book. One of his most important goals was to help individuals become free of emotional boundaries and achieve freedom for a fulfilled life. Countless people all over the world studied with him his spiritual philosophy, knowledge and great techniques and now carry on with his wonderful work. Frank Alper always made the statement that we, as human beings, are not here to have spiritual experiences, but we are spiritual beings who are here to have human experiences.< Less
Exploring Atlantis By Frank Alper
Paperback: $31.80
Prints in 3-5 business days
A complete edition of the trilogy “Exploring Atlantis”, presenting Frank Alper’s spiritually channelled lectures during 1980 through 1986 in Phoenix, AZ. A unique transmission of... More > knowledge about the ancient Atlanteans’ social, moral, sexual and spiritual customs and habits by Universal Masters such as Strength from Atlantis, Atemose II, Kryon, Pythagoras and others. A large part of the book is dedicated to the function and use of quartz crystals by the Atlanteans. Patterns of crystals for healing applications are explained throughout the book. One of his most important goals was to help individuals become free of emotional boundaries and achieve freedom for a fulfilled life. Countless people all over the world studied with him his spiritual philosophy, knowledge and great techniques and now carry on with his wonderful work. Frank Alper always made the statement that we, as human beings, are not here to have spiritual experiences, but we are spiritual beings who are here to have human experiences.< Less
Exploring Atlantis By Frank Alper
Hardcover: $42.95
Prints in 3-5 business days
A complete edition of the trilogy “Exploring Atlantis”, presenting Frank Alper’s spiritually channelled lectures during 1980 through 1986 in Phoenix, AZ. A unique transmission of... More > knowledge about the ancient Atlanteans’ social, moral, sexual and spiritual customs and habits by Universal Masters such as Strength from Atlantis, Atemose II, Kryon, Pythagoras and others. A large part of the book is dedicated to the function and use of quartz crystals by the Atlanteans. Patterns of crystals for healing applications are explained throughout the book. One of his most important goals was to help individuals become free of emotional boundaries and achieve freedom for a fulfilled life. Countless people all over the world studied with him his spiritual philosophy, knowledge and great techniques and now carry on with his wonderful work. Frank Alper always made the statement that we, as human beings, are not here to have spiritual experiences, but we are spiritual beings who are here to have human experiences.< Less
Healing in the Present Moment By Linda Jenkins
Paperback: $14.99
Prints in 3-5 business days
Understanding our personal reality and destiny is created through choice and intention gives us control for mapping the blueprint of our life path. Healing negative thoughts and emotions from... More > challenges and adversities that life delivers impacts health, social acceptance, loving relationships and self confidence. Addiction, dementia and death create dysfunction within families. Spiritual reconnection of self to source allows rationality to reclaim functional existence. Conscious choice and positive awareness allows us to live meaningful, creative lives. Human consciousness and spirituality are re-awakening seeking a connection to our energetic universe through states of love and compassion for understanding the intricate interwoven ways we each affect the world we share. Dementia and addiction create complicated dynamics in families. Healing in the present moment allows us to re-evaluate life’s issues our soul has come to manifest.< Less
Sandalphon - The Archangel of Music By The Abbotts
eBook (ePub): $3.99
Everyone loves music and we all love the angels, so put them together and you have the history of music and a personal introduction to Sandalphon, an archangel who is happy to teach you how to relate... More > to, compose, find love and heal by using the magic of music! The Abbotts, paranormal experts have channelled Sandalphon for many years and his inspiring messages are full of angelic tips as to how to sing better, dance freely, learn an instrument easily and compose your own short melodies! You can even learn to clairaudiently hear the stars and the earth hum! A not to be missed book for any student of the esoteric or any lover of music from rock n' roll to opera! Easy reading and fully illustrated.< Less
Sandalphon - The Archangel of Music By The Abbotts
eBook (PDF): $3.99
Everyone loves music and we all love the angels, so put them together and you have the history of music and a personal introduction to Sandalphon, an archangel who is happy to teach you how to relate... More > to, compose, find love and heal by using the magic of music! The Abbotts, paranormal specialists have channelled Sandalphon for many years and his inspiring messages are full of angelic tips as to how to sing better, dance freely, learn an instrument easily and compose your own short melodies! You can even learn to clairaudiently hear the stars and the earth hum! A not to be missed book for any student of the esoteric or any lover of music from rock n' roll to opera! In 14pt print for easy reading and fully illustrated.< Less

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