Overview

This is an enlarged and revised second edition of a book first published in 1978 and reprinted twice since then. The new edition includes updates to all the original chapters, plus two new chapters on developments in superresolution techniques and their application to direction-finding arrays. Modern direction finders, capable of measuring elevation angles as well as azimuth angles on the components of multi-ray wavefields, have become powerful tools for research in ionospheric physics and HF radio propagation. The complexity of the problem of resolving closely-spaced rays requires the combined use of wide aperture antenna arrays, multichannel receiving systems and sophisticated digital processing techniques. Published research papers over the last twelve years provide a rich source of information on the development of superresolution algorithms for use in radar, sonar, geophysics and spectral analysis, as well as radio direction finding. Dr. Gething reviews the important methods and results, showing how some of the new techniques are related to the wavefront analysis methods described in the first edition. The text is illustrated with computer plots of model wavefields and contains important results on the loci of constant phase and amplitude, and on the statistical properties of bearing-error distributions for specified models. The collection and interpretation of ionospheric data for the purpose of mode identification, and the statistical theory of DF plotting algorithms, are also discussed. Wavefront analysis and superresolution may be regarded as extensions to classical array theory. The basic principles are widely applicable and should therefore be of interest to research workers in radar, sonar, radioastronomy and adaptive array theory, as well as HF radio direction finding.

Full Product Details

Author:   P.J.D. Gething
Publisher:   Institution of Engineering and Technology
Imprint:   Institution of Engineering and Technology
Edition:   2nd edition
Volume:   No 33
ISBN:  

9780863412387

ISBN 10:   0863412386
Pages:   386
Publication Date:   30 June 1991
Audience:   College/higher education ,  Professional and scholarly ,  Undergraduate ,  Postgraduate, Research & Scholarly
Format:   Hardback
Publisher's Status:   Active
Availability:   In Print  
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Table of Contents

Chapter 1: Introduction Chapter 2: Ionospheric modes Chapter 3: Wave-field models Chapter 4: Zero-aperture bearings in two-ray wave-fields Chapter 5: Directive array patterns Chapter 6: Instrumental and site errors Chapter 7: An introduction to resolution techniques Chapter 8: Wave interference effects for circular arrays Chapter 9: Wave interference effects for interferometers Chapter 10: Wavefront analysis: the concept Chapter 11: Wavefront analysis using imperfect data Chapter 12: Superresolution algorithms Chapter 13: Additional tools for superresolution Chapter 14: Ray paths Chapter 15: The effects of ionospheric tilts Chapter 16: Bearing accuracy and DF plots Chapter 17: Conclusions Appendix 1: Circular WADF: parameters used in pattern calculations Appendix 2: The theory of multiplicative processing Appendix 3: Vertical array ofloops: parameters used in pattern calculations Appendix 4: An example of masquerading Appendix 5: Covariance matrix of sensor outputs Appendix 6: Magneto-ionic deviations calculated with the Jones three-dimensional ray-tracing program Appendix 7: Path integrals for parabolic layers Appendix 8: The effective tilt of a parabolic layer Appendix 9: Standard deviations of the best point estimate

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