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Blip, Ping, and Buzz

Making Sense of Radar and Sonar

Mark Denny

Publication Year: 2007

Have you ever wondered how stealth planes achieve "invisibility," how sunken ships are found, or how fishermen track schools of fish in vast expanses of ocean? Radar and sonar echolocation—a simple matter of sending, receiving, and processing signals. Weaving history with simple science, Mark Denny deftly reveals the world of radar and sonar to the curious reader, technology buff, and expert alike. He begins with an early history of the Chain Home radar system used during World War II and then provides accessible and engaging explanations of the physics that make signal processing possible. Basic diagrams and formulas show how electromagnetic and sound waves are transmitted, received, and converted into images, allowing you to literally see in the dark. A section on bioacoustic echolocation, with a focus on the superior sonar systems of bats and whales and a discussion of the advanced technology of next-generation airborne signal processors, opens the imagination to fascinating possibilities for the future.

Published by: The Johns Hopkins University Press

Acknowledgments

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pp. ix-

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Introduction: Hearing the Picture

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pp. 1-7

Every author should explain to his readers, up front, what the book they hold in their hands is about and what it is not about. After all, if you are to invest some hard-earned cash in buying this book and a lot of time in reading it, then you naturally want to know whether the subject is of interest.The quick explanation, expanded over the next few paragraphs, is this: my...

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1. Early Days

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pp. 8-45

Let’s begin with a look at the frantic early days of radar, immediately before the Second World War and during the first couple of years of that epoch-changing conflict. In particular, we’ll focus on the story of the first radar application: the clunky but ultimately successful Chain Home (CH)early warning system that proved to be the decisive factor during the Battle...

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2. Remote Sensing Foundations

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pp. 46-63

Given that this book falls under the heading of “Technology—Radar and Sonar,” I seem to have spilled quite a lot of ink on the subject of “History—Battle of Britain.” I wanted to help you understand why radar technology mattered as well as what it does, and the historical imperatives that gave rise to it. Thus, when the British were seeking ways to increase the angular ac-...

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3. Signal Processing Techniques

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pp. 64-89

Our first order of business is to examine several signal processing schemes that greatly enhance the target signal, relative to the unwanted noise and clutter signals. Once this has been achieved, then we know that a carefully chosen threshold can be applied to tell us whether a target is present. When we have got to that stage—target detection—then we can move forward and...

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4. Tactics: Skunks and Old Crows

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pp. 90-120

If chapter 1 consisted of an historical aperitif, then appetizers and entr

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5. Mapping: Hearing the Picture

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pp. 121-156

Most modern radar screens present the data on a display laid out in the form of a two-dimensional map. Perhaps the display shows range against azimuth angle, as in figure 5.1—this is typical of surveillance radars that are searching the sea surface, or looking for incoming low-level missiles or air-planes. Some displays show plots of range versus speed, or azimuth versus...

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6. Specialized Applications and Advanced Techniques

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pp. 157-191

We have explored most of the extensive territory that constitutes remote sensing. We have trekked through a morass of technical notes to reach the lofty peaks of signal correlation, Doppler processing, and synthetic apertures. I hope that you have gained an appreciation of the lay of the land. If you wish to explore in more detail, I have referred to other guides that will...

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7. Final Thoughts

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pp. 192-198

Please understand that, despite the twenty-three technical notes and the intentionally broad-sweep, scatter-gun approach that I have adopted for this book, I have only scratched the surface of remote sensing techniques.Also, there are alternative versions of every single technical subject dis-cussed in this book, from antennas, beamforming, CFAR, and Doppler...

Technical Notes

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pp. 199-260

Glossary

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pp. 261-268

Index

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pp. 269-274


E-ISBN-13: 9781421403359
E-ISBN-10: 1421403358
Print-ISBN-13: 9780801886652
Print-ISBN-10: 0801886651

Page Count: 288
Illustrations: 67 b&w illustrations, 28 line drawings
Publication Year: 2007

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Subject Headings

  • Remote sensing -- Popular works.
  • Radar -- Popular works.
  • Sonar -- Popular works.
  • Signal processing -- Popular works.
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