Blip, Ping, and Buzz
Making Sense of Radar and Sonar
Publication Year: 2007
Published by: The Johns Hopkins University Press
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Introduction: Hearing the Picture
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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...
1. Early Days
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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...
2. Remote Sensing Foundations
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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-...
3. Signal Processing Techniques
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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...
4. Tactics: Skunks and Old Crows
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If chapter 1 consisted of an historical aperitif, then appetizers and entr�es were served in chapters 2 and 3. Desserts, digest if, port, and cigars are yet to appear. That is to say, what follows will contain less meat and potatoes than the last two chapters but will, perhaps, be easier to digest. I do not mean to imply that the content henceforth will be nontechnical, but that...
5. Mapping: Hearing the Picture
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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...
6. Specialized Applications and Advanced Techniques
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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...
7. Final Thoughts
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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...
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Page Count: 288
Illustrations: 67 b&w illustrations, 28 line drawings
Publication Year: 2007