Author Spotlight
David Gibson's Store
CREG Journal Archive: 15 to 25 By Mike Bedford (editor), David Gibson (technical editor)
Paperback: List Price: $49.18 $24.59 | You Save: 50%
Prints in 3-5 business days
This publication is a facsimile reproduction of issues 15 to 25 of the journals of the Cave Radio & Electronics Group (CREG), which were originally issued between March 1994 and September 1996 as... More > ISSN 1361-4800. CREG is a UK-based special interest group of the British Cave Research Association and is probably the world's leading organisation of its kind. Its aims are to encourage the development and use of radio communication and other electronic and computer equipment in caving and related activities. The Group was established in 1987 and, in 2011, celebrated its 25th year and its 75th published journal. Its followers include cavers, radio amateurs, electronic engineers and professional & industrial organisations. The British Cave Research Association (bcra.org.uk) is a registered charity, and a constituent body of the British Caving Association, undertaking charitable activities on behalf of BCA.< Less
CREG Journal Archive: 1 to 14 By Mike Bedford (editor), David Gibson (technical editor)
Paperback: List Price: $49.16 $24.58 | You Save: 50%
Prints in 3-5 business days
This publication is a facsimile reproduction of issues 1 to 14 of the journals of the Cave Radio & Electronics Group (CREG), which were originally issued between Autumn 1988 and December 1993 as... More > ISSN 1361-4800. CREG is a UK-based special interest group of the British Cave Research Association and is probably the world's leading organisation of its kind. Its aims are to encourage the development and use of radio communication and other electronic and computer equipment in caving and related activities. The Group was established in 1987 and, in 2011, celebrated its 25th year and its 75th published journal. Its followers include cavers, radio amateurs, electronic engineers and professional & industrial organisations. The British Cave Research Association (bcra.org.uk) is a registered charity, and a constituent body of the British Caving Association, undertaking charitable activities on behalf of BCA.< 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
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
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