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Signal processing for passive bistatic radar
This cutting-edge resource introduces the basic concepts of passive bistatic radar, such as bistatic geometry, bistatic radar equation and analysis of different illuminating signals. These techniques, although known for almost a century, have not been developed intensively for decades, mainly due to technical limitations, but today, the passive radar concept can be realized in practice, and is of great interest for military and civilian users. This book provides insight into understanding the potential and limitations of passive radar systems, as well as the differences between signal processing in active and passive radar. Each of the signal processing stages typically applied in passive radar is described, including digital beamforming, clutter removal, target detection, localization and tracking. These concepts are illustrated with both simulated and measured data along with examples of passive radar systems.Correlation processing, which is crucial for passive radar operation, is presented, as well as practical approaches for calculating the cross-ambiguity function. The problems of range and velocity-cell migration are also introduced. The book analyzes and compares different antenna array geometries to show readers the appropriate solution for a particular scenario of passive radar. Cartesian tracking is also presented, based on the extended Kalman filter. Parallel and sequential updating approaches are introduced and compared. These concepts are illustrated with both simulated and measured data along with examples of passive radar systems, making this book useful for both novice and advanced practitioners.
eBook
De-convergence of global media industries
\"Convergence has become a buzzword, referring on the one hand to the integration between computers, television, and mobile devices or between print, broadcast, and online media and on the other hand, the ownership of multiple content or distribution channels in media and communications. Yet while convergence among communications companies has been the major trend in the neoliberal era, the splintering of companies, de-convergence, is now gaining momentum in the communications market. As the first comprehensive attempt to analyze the wave of de-convergence of the global media system in the context of globalization, this book makes sense of those transitions by looking at global trends and how global media firms have changed and developed their business paradigm from convergence to de-convergence. Jin traces the complex relationship between media industries, culture, and globalization by exploring it in a transitional yet contextually grounded framework, employing a political economic analysis integrating empirical data analysis\"-- Provided by publisher.
Book
The Marketplace of Attention
Feature films, television shows, homemade videos, tweets, blogs, and breaking news: digital media offer an always-accessible, apparently inexhaustible supply of entertainment and information. Although choices seems endless, public attention is not. How do digital media find the audiences they need in an era of infinite choice? InThe Marketplace of Attention, James Webster explains how audiences take shape in the digital age. Webster describes the factors that create audiences, including the preferences and habits of media users, the role of social networks, the resources and strategies of media providers, and the growing impact of media measures -- from ratings to user recommendations. He incorporates these factors into one comprehensive framework: the marketplace of attention. In doing so, he shows that the marketplace works in ways that belie our greatest hopes and fears about digital media. Some observers claim that digital media empower a new participatory culture; others fear that digital media encourage users to retreat to isolated enclaves. Webster shows that public attention is at once diverse and concentrated -- that users move across a variety of outlets, producing high levels of audience overlap. So although audiences are fragmented in ways that would astonish midcentury broadcasting executives, Webster argues that this doesn't signal polarization. He questions whether our preferences are immune from media influence, and he describes how our encounters with media might change our tastes. In the digital era's marketplace of attention, Webster claims, we typically encounter ideas that cut across our predispositions. In the process, we will remake the marketplace of ideas and reshape the twenty-first century public sphere.
eBook
Netflix and the re-invention of television
\"This book deals with the various ways Netflix reconceptualises television as part of the process of TV IV. As television continues to undergo a myriad of significant changes, Netflix has proven itself to be the dominant force in this development, simultaneously driving a number of these changes and challenging television's existing institutional structures. This comprehensive study explores the pre-history of Netflix, the role of binge-watching in its organisation and marketing, and Netflix's position as a transnational broadcaster. It also examines different concepts of control and the role these play in the history of ancillary technologies, from the remote control to binge-watching as Netflix's iteration of giving control to the viewers. By focusing on Netflix's relationship with the linear television schedule, its negotiations of quality and marketing, as well as the way Netflix integrates into national media systems, Netflix and the Re-invention of Television illuminates the importance of Netflix's role within the processes of TV IV.\"-- Provided by publisher.
Book
Non-Line-of-Sight Radar
This book is the first book on the new and exciting area of detecting and tracking targets via radar multipath without direct-line-of-sight (DLOS). This revolutionary capability is finding new applications in the tracking of objects in non-line-of-sight (NLOS) urban environments including detection and tracking of UAVs. This book brings together for the first time all the essential underpinnings and techniques required to develop and field a viable NLOS radar. It presents many examples, including electromagnetic radiation propagation in urban NLOS environments, extracting building location and morphology from readily available terrain databases, predictive ray-tracing techniques, and multi-target NLOS tracking. Readers will learn how to apply radar to urban tracking that was previously deemed impossible. The book shows how real-time physics calculations can be incorporated into the radar processor, and how existing radar hardware can be adopted for non-line-of-sight radar use without major upgrades. Including results from both high-fidelity, physics-based simulations and actual flight test data, this book establishes the efficacy of NLOS radar in practical applications.
eBook
Signal Digitization and Reconstruction in Digital Radios
This comprehensive resource provides the latest information on digitization and reconstruction (D) of analog signalsin digital radios. Readers learn how to conduct comprehensive analysis, concisely describe the major signalprocessing procedures carried out in the radios, and demonstrate the dependence of these procedures on thequality of D. The book presents and analyzes the most promising and theoretically sound ways toimprove the characteristics of D circuits and illustrate the influence of these improvements on thecapabilities of digital radios.The book is intended to bridge the gap that exists between theorists and practical engineers developing D techniques by introducing new signal transmission and reception methods that can effectively utilize the uniquecapabilities offered by novel digitization and reconstruction techniques.
eBook
Handbook of Antennas for EMC (2nd Edition)
Finally - A completely revised, updated, and expanded edition of the Artech House classic of this book. The second edition features a wealth of brand new material, including chapters on recent techniques, standards, and measurements. This invaluable resource provides a thorough understanding of the practical aspects and underpinnings of antennas in EMC systems. Professionals find summaries of important underlying mathematics without the heavy theoretical emphasis that characterizes much of the existing literature. Professionals discover which antennas to choose for electromagnetic (EM) compatibility and compliance. Moreover, this authoritative book offers a solid understanding of the main characteristics of an antenna in a qualitative manner. Essential reading for EMC engineers, this volume provides the knowledge needed to determine the right antenna for specific applications and offers guidance in conducting EMC testing.
eBook
Crowdsourcing
Ever since the term \"crowdsourcing\" was coined in 2006 byWiredwriter Jeff Howe, group activities ranging from the creation of the Oxford English Dictionary to the choosing of new colors for M&Ms have been labeled with this most buzz-generating of media buzzwords. In this accessible but authoritative account, grounded in the empirical literature, Daren Brabham explains what crowdsourcing is, what it is not, and how it works. Crowdsourcing, Brabham tells us, is an online, distributed problem solving and production model that leverages the collective intelligence of online communities for specific purposes set forth by a crowdsourcing organization -- corporate, government, or volunteer. Uniquely, it combines a bottom-up, open, creative process with top-down organizational goals. Crowdsourcing is not open source production, which lacks the top-down component; it is not a market research survey that offers participants a short list of choices; and it is qualitatively different from predigital open innovation and collaborative production processes, which lacked the speed, reach, rich capability, and lowered barriers to entry enabled by the Internet. Brabham describes the intellectual roots of the idea of crowdsourcing in such concepts as collective intelligence, the wisdom of crowds, and distributed computing. He surveys the major issues in crowdsourcing, including crowd motivation, the misconception of the amateur participant, crowdfunding, and the danger of \"crowdsploitation\" of volunteer labor, citing real-world examples from Threadless, InnoCentive, and other organizations. And he considers the future of crowdsourcing in both theory and practice, describing its possible roles in journalism, governance, national security, and science and health.
eBook