Photonically Generated True Time Delay for Phased Array Applications PDF Download
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Author:
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Category :
Languages : en
Pages : 0
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Book Description
Several relatively new photonic components have recently come to the forefront in applications related to the photonic processing of broadband microwave signals. Included in this set of photonic elements are the wavelength tunable laser, high dispersion optical fiber, and the Bragg reflection grating. These components hold the promise of revolutionizing the field of broadband photonic processing. This report documents the performance characteristics of these components and shows how they can be used for two broadband phased array applications, beamforming and null steering. Two systems are described. A technical overview is presented for each system with experimental data provided to demonstrate the performance of each system. Both systems described herein maximize component reuse and fully integrate transmit and receive modes in efficient hardware compressive topologies.
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ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Several relatively new photonic components have recently come to the forefront in applications related to the photonic processing of broadband microwave signals. Included in this set of photonic elements are the wavelength tunable laser, high dispersion optical fiber, and the Bragg reflection grating. These components hold the promise of revolutionizing the field of broadband photonic processing. This report documents the performance characteristics of these components and shows how they can be used for two broadband phased array applications, beamforming and null steering. Two systems are described. A technical overview is presented for each system with experimental data provided to demonstrate the performance of each system. Both systems described herein maximize component reuse and fully integrate transmit and receive modes in efficient hardware compressive topologies.
Author: Kevin Baldwin
Publisher:
ISBN:
Category : Acoustooptical devices
Languages : en
Pages : 324
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Book Description
"Over the past few years, phased array antennas and variable RF/Microwave delay lines have been the subject of much research. This thesis presents a photonic solution to the generation of multiple, compact delay lines. Variable time delays are generated by optically tapping points on an acousto-optic cell by the use of a deformable mirror device. Isolation of a particular time delay is accomplished by the conversion of a time delay point into a corresponding spatial frequency by the use of appropriate optics. The desired time delay is recovered by heterodyning a local oscillator with the desired spatial frequency, selected by a tiltable mirror device. Multiple delay lines are produced by the use of a binary optic device. The design and simulation of the integrated optical system was carried out using a real ray tracing program written by the author. Theoretical signal to noise calculations are also carried out."--Abstract.
Author: Fabio Cavaliere
Publisher: Artech House
ISBN: 1630816663
Category : Technology & Engineering
Languages : en
Pages : 301
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Book Description
This hands-on, practical new resource provides optical network designers with basic but necessary information about radio systems air interface and radio access network architecture, protocols, and interfaces, using 5G use cases as relevant example. The book introduces mobile network designers to the transmission modeling techniques for the design of a radio access optical network. The main linear and non-linear propagation effects in optical fiber are covered. The book introduces mobile network designers to the optical technologies used in digital and analog radio access networks, such as optical amplifiers and transmitters, and describes different deployment scenarios, including point-to-point fiber systems, wavelength-division multiplexing systems, and passive optical networks. New integrated photonic technologies for optical switching are also discussed. The book illustrates the principles of optical beamforming and explains how optical technologies can be used to provide accurate phase and frequency control of antenna elements. The new architecture of the optical transport network, driven by the new, challenging requirements that 5G poses in terms of high capacity, high energy efficiency, low latency and low cost is discussed. The use of photonic devices to perform tasks as radio-frequency generation and beamforming, with improved accuracy and cost compared to traditional electronic systems, especially when moving to mm-waves is also explored. Readers also learn the replacement of electric interconnect systems with higher speed and more energy efficient optical lines to perform more effectively computationally demanding baseband processing in 5G. All presented propagation models can be implemented in a spreadsheet, in order to provide the designer with simple rules of thumbs for network planning.
Author:
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Category :
Languages : en
Pages : 53
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Book Description
There are many communication and radar applications requiring antennas with high directionality and narrow beam width. Typically, the width and directivity of the radiation pattern of a single radiating antenna element is insufficient for these applications. One method of improving these limitations is to increase the element aperture. A typical approach is to place the radiating element at the focal point of a large parabolic dish. However, for many mobile platform applications this is not a practical approach. With a narrow radiation pattern the antenna aperture must be steered to direct the signal in the desired direction. For a large dish antenna it may be difficult to position the aperture quickly enough due to inertia effects of the massive antenna. A better method to increase the antenna aperture without the adverse consequences of a large dish structure is to use an antenna array, which is an assembly of radiating elements in a given geometrical pattern. The beam pattern of an array antenna can be adjusted by any of five parameters: the geometrical configuration of the array, the displacement between the elements, the excitation amplitude, the excitation phase, and the radiation pattern of the individual elements. As will be shown, by adjusting the phase of the signal delivered to each element it is possible to control the steering angle of the beam without physically repositioning the antenna aperture. Such an antenna is called a phased array antenna. (PAA) because a phased array antenna does not need to be physically repositioned, its reaction time can be several orders of magnitude faster than a large dish antenna. This allows PAA systems to be multifunctional, meaning they can perform many different tasks simultaneously.
Author: Nabeel A. Riza
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 736
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Book Description
Topics in this volume include: antenna beamforming using optical processor; novel optical techniques for phased-array processing; and optically-controlled phased array radar receiver using SLM switched real time delays.
Author: Nicholas Fourikis
Publisher: Elsevier
ISBN: 0080498701
Category : Technology & Engineering
Languages : en
Pages : 389
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Book Description
Advanced Array Systems, Applications and RF Technologies adopts a holistic view of arrays used in radar, electronic warfare, communications, remote sensing and radioastronomy. Radio frequency (RF) and intermediate frequency (IF) signal processing is assuming a fundamental importance, owing to its increasing ability to multiply a system's capabilities in a cost-effective manner. This book comprehensively covers the important front-end RF subsystems of active phased arrays, so offering array designers new and exciting opportunities in signal processing. Provides an up to date record of existing systems from different applications Explores array systems under development Bridges the gap between textbook coverage of idealized phased arrays and practical knowledge of working phased arrays Recognises the significance of cost to the realization of phased arrays Discusses future advances in the field that promise to deliver even more affordable arrays ['intelligent' or self-focussing/-cohering arrays]
Author: A M Rajendran
Publisher: World Scientific
ISBN: 9814476684
Category : Technology & Engineering
Languages : en
Pages : 601
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Book Description
This book provides the reader with a unique opportunity to understand the basic and applied research and technology areas that support applications to enable Transformational capabilities for US Soldiers. The research papers are in line with the theme of the 24th Army Science Conference: “Transformational Science and Technology for the Current and Future Force,” emphasizing the critical role of Science and Technology in addressing the significant challenges posed by Global War On Terrorism while simultaneously developing Transformational capabilities for the Future Force.
Author: Mike Golio
Publisher: CRC Press
ISBN: 1420006711
Category : Technology & Engineering
Languages : en
Pages : 690
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Book Description
This volume, RF and Microwave Applications and Systems, includes a wide range of articles that discuss RF and microwave systems used for communication and radar and heating applications. Commercial, avionics, medical, and military applications are addressed. An overview of commercial communications systems is provided. Past, current, and emerging cellular systems, navigation systems, and satellite-based systems are discussed. Specific voice and data commercial systems are investigated more thoroughly in individual chapters that follow. Detailed discussions of military electronics, avionics, and radar (both military and automotive) are provided in separate chapters. A chapter focusing on FR/microwave energy used for therapeutic medicine is also provided. Systems considerations including thermal, mechanical, reliability, power management, and safety are discussed in separate chapters. Engineering processes are also explored in articles about corporate initiatives, cost modeling, and design reviews. The book closes with a discussion of the underlying physics of electromagnetic propagation and interference. In addition to new chapters on WiMAX and broadband cable, nearly every existing chapter features extensive updates and several were completely rewritten to reflect the massive changes areas such as radio navigation and electronic warfare.
Author: Jianping Yao
Publisher: John Wiley & Sons
ISBN: 1394205287
Category : Science
Languages : en
Pages : 501
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Book Description
MICROWAVE PHOTONICS Overview of techniques in the field of microwave photonics, including recent developments in quantum microwave photonics and integrated microwave photonics Microwave Photonics offers a comprehensive overview of the microwave photonic techniques developed in the last 30 years, covering topics such as photonics generation of microwave signals, photonics processing of microwave signals, photonics distribution of microwave signals, photonic generation and distribution of UWB signals, photonics generation and processing of arbitrary microwave waveforms, photonic true time delay beamforming for phased array antennas, photonics-assisted instantaneous microwave frequency measurement, quantum microwave photonics, analog-to-digital conversion and more. The text is supported by a companion website for instructors, including learning objectives and questions/problems to further enhance student learning. Written by key researchers in the field, Microwave Photonics includes information on: Group-velocity dispersion and nonlinear effects in fibers, light coherence in light sources, phase and intensity modulators, photodetectors, and fiber Bragg gratings Injection locking, phase lock loops, external modulation, opto-electronic oscillators, and array waveguide gratings Photonic microwave delay-line filters with negative and complex coefficients and non-uniformly spaced photonic microwave delay-line filters Double- and single-sideband modulation, radio over fiber networks, and microwave photonics to coherent communication systems UWB generation, coding, and distribution over fiber, and instantaneous microwave frequency measurement via power monitoring True time delay beamforming Exploring the subject in depth, with expansive coverage of techniques developed in the last 30 years, Microwave Photonics is an essential reference for graduate students and researchers to learn microwave photonic technologies.
Author:
Publisher:
ISBN:
Category : Optical radar
Languages : en
Pages : 388
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Book Description
