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Author: John E. Kaufmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 95
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Book Description
Author: John E. Kaufmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 95
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Book Description
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781729130087
Category :
Languages : en
Pages : 28
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Book Description
The launch of a laser communication transmitter package into geosynchronous Earth orbit onboard the Advanced Communications Technology Satellite (ACTS) will present an excellent opportunity for the experimental reception of laser communication signals transmitted from a space orbit. The ACTS laser package includes both a heterodyne transmitter (Lincoln Labs design) and a direct detection transmitter (Goddard Space Flight Center design) with both sharing some common optical components. NASA Lewis Research Center's Space Electronics Division is planning to perform a space communication experiment utilizing the GSFC direct detection laser transceiver. The laser receiver will be installed within an aircraft provided with a glass port for the reception of the signal. This paper describes the experiment and the approach to performing such an experiment. Described are the constraints placed on the NASA Lewis experiment by the performance parameters of the laser transmitter and by the ACTS spacecraft operations. The conceptual design of the receiving terminal is given; also included is the anticipated capability of the detector. Provencher, Charles E., Jr. and Spence, Rodney L. Glenn Research Center RTOP 650-60-23...
Author: Jianjun Zhang
Publisher: John Wiley & Sons
ISBN: 1119910714
Category : Technology & Engineering
Languages : en
Pages : 212
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Book Description
State of the art resource covering key technologies and related theories of inter-satellite links Inter-Satellite Links Technology explores satellite networking as a growing topic in the field of communication technology, introducing the definition, types, and working frequency bands of inter-satellite links, discussing the number of orbital elements of the spacecraft motion state under two-body motion and their conversion relationship, and establishing the basic demand model for inter-satellite link network, chain topology model, and transmission protocol model. The book focuses on the analysis and introduction of the principles and error sources of microwave and laser inter-satellite ranging, including the basic composition, workflow, and constraints of the laser inter-satellite link, and related design principles of the inter-satellite laser transmitter and receivers. Later chapters also discuss theories and methods of acquisition, alignment, and tracking, the impact of alignment errors on performance, and inter-satellite link modulation and its implementation. Specific sample topics covered in Inter-Satellite Links Technology include: Pulse position modulation (PPM), Differential Pulse Position Modulation (DPPM), Digital Pulse Interval Modulation (DPIM), and Double-head pulse interval modulation (DH-PIM) Basic demand model of inter-satellite link network application, including basic configuration of constellations and inter-satellite transmission networks Inter-satellite ranging accuracy, principles of microwave inter-satellite ranging, and analysis of microwave ranging error sources Effect of tracking error on the beam distribution at the receiving end and influence of tracking and pointing error on communication error rate Inter-Satellite Links Technology serves a completely comprehensive resource on the subject and is a must-have reference for experts and scholars in aerospace, along with graduates and senior undergraduates in related programs of study.
Author: Hamid Hemmati
Publisher: CRC Press
ISBN: 1420015443
Category : Science
Languages : en
Pages : 418
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Book Description
Invented more than a hundred years ago by Alexander Graham Bell, the technology of free-space optical communications, or lasercom, has finally reached the level of maturity required to meet a growing demand for operational multi-giga-bit-per-second data rate systems communicating to and from aircrafts and satellites. Putting the emphasis on near-earth links, including air, LEO, MEO, and GEO orbits, Near-Earth Laser Communications presents a summary of important free-space laser communication subsystem challenges and discusses potential ways to overcome them. This comprehensive reference provides up-to-date information on component and subsystem technologies, fundamental limitations, and approaches to reach those limits. It covers basic concepts and state-of-the-art technologies, emphasizing device technology, implementation techniques, and system trades. The authors discuss hardware technologies and their applications, and also explore ongoing research activities and those planned for the near future. The analytical aspects of laser communication have been covered to a great extent in several books. However, a detailed approach to system design and development, including trades on subsystem choices and implications of the hardware selection for satellite and aircraft telecommunications, is missing. Highlighting key design variations and critical differences between them, this book distills decades’ worth of experience into a practical resource on hardware technologies.
Author: National Aeronautics and Space Administration (NASA)
Publisher:
ISBN: 9781722004811
Category :
Languages : en
Pages : 26
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Book Description
The launch of a laser communication transmitter package into geosynchronous Earth orbit onboard the Advanced Communications Technology Satellite (ACTS) will present an excellent opportunity for the experimental reception of laser communication signals transmitted from a space orbit. The ACTS laser package includes both a heterodyne transmitter (Lincoln Labs design) and a direct detection transmitter (Goddard Space Flight Center design) with both sharing some common optical components. NASA Lewis Research Center's Space Electronics Division is planning to perform a space communication experiment utilizing the GSFC direct detection laser transceiver. The laser receiver will be installed within an aircraft provided with a glass port for the reception of the signal. This paper describes the experiment and the approach to performing such an experiment. Described are the constraints placed on the NASA Lewis experiment by the performance parameters of the laser transmitter and by the ACTS spacecraft operations. The conceptual design of the receiving terminal is given; also included is the anticipated capability of the detector. Provencher, Charles E., Jr. and Spence, Rodney L. Glenn Research Center RTOP 650-60-23...
Author: Xizheng Ke
Publisher: Springer Nature
ISBN: 9811679010
Category : Technology & Engineering
Languages : en
Pages : 387
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Book Description
This book introduces in detail the theory of adaptive optics and its correction technology for light wave distortion in wireless optical communication. It discusses the adaptive control algorithm of wavefront distortion, proportional+integral control algorithm and iterative control algorithm, and double fuzzy adaptive PID control algorithm. It also covers the SPGD algorithm of adaptive optics correction, deformable mirrors eigenmode method of wavefront aberration correction, vortex beam wavefront detecting wavefront aberration correction, liquid crystal spatial light modulator wavefront correction, different wavelengths of Gaussian beam transmission wavefront differences in the atmospheric turbulence and correction and with wavefront tilt correction adaptive optics wavefront aberration correction. Various distortion correction methods are verified by experiments and the experimental results are analyzed. This book is suitable for engineering and technical personnel engaged in wireless optical communication, college teachers, graduate students and senior undergraduate students.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 269
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Book Description
This is the final report on a study of laser-based intersatellite communications links. Three links are considered: between geostationary satellites, between geostationary and inclined geosynchronous satellites, and between geostationary and low earth orbit satellites. Section 1 provides historical & technical background on laser communications systems and an outline of ongoing optical intersatellite link (ISL) development programs. Section 2 analyzes the operational parameters of the three links under study. Section 3 reviews optical ISL technology and the current or projected performance of ISL components. Link gains & losses are identified in section 4 for both direct detection & heterodyne receivers and for direct modulation laser diodes & externally modulated gas & solid state lasers. Section 5 discusses the acquisition & tracking functions that are essential before data transmission can begin. Section 6 presents the conceptual design for the baseline direct detection system operating at 100 megabytes per second and for two options at one gigabyte per second. Performance parameters are listed for the baseline system with changes indicated for the two optional systems. A telescope is selected and the optical bench dimensions are established for all three systems. An outline is presented for the electrical system which supports the communications signal and controls the system for acquisition & tracking. The final sections review Canadian capabilities in optical ISL and outline a roadmap to achieve a Canadian presence in the optical ISL market.
Author: David G. Aviv
Publisher: Artech House Publishers
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 220
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Book Description
This groundbreaking resource is the first book to offer you a thorough, practical treatment of laser space communications. The book focuses on the feasibility of laser space communication links between satellites, satellites and airborne platforms, and satellites and ground based stations to achieve worldwide connectivity. You get expert guidance on weather avoidance approaches and adaptive antenna subsystems that help mitigate the effects of turbulence. The book presents simplified, yet highly accurate, engineering expressions of complex mathematics of turbulence that provide you with numerical values in the links' signal power budget. Moreover, you find an entire chapter devoted to noise photons and their effect on the bit error rate. This comprehensive volume covers a wide range of critical topics you need to understand for your work in the field, from a discussion on laser vs. RF communications in space, basic design features of a laser transceiver, and configuration of inter-satellite communication links, to selection of ground station locations, 5th Generation Internet (5-GENIN), and signal modulation schemes. The book is supported with over 70 illustrations and more than 100 equations.
Author: Xizheng Ke
Publisher: Springer Nature
ISBN: 9819715229
Category :
Languages : en
Pages : 1881
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 310
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Book Description
