Download or read book Design and Evaluation of a Directional Antenna for Ocean Buoys written by and published by . This book was released on 1911 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Funding was provided by Viasat, Inc., under subcontract No. SC95001 and by a Cecil H. and Ida M. Green Technology Innovation Award.

Download or read book Design and Evaluation of a Directional Antenna for Ocean Buoys written by Daniel E. Frye and published by . This book was released on 1997 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: A system concept has been developed by Viasat, Inc. and Woods Hole Oceanographic Institution for improving the data telemetry bandwidth available on ocean buoys. This concept utilizes existing communications satellites as data relay stations and mechanically steered antenna arrays to achieve increased data rates and improved power efficiency needed for ocean applications. This report describes an initial feasibility and design study to determine if a mechanically steered antenna array can meet the requirements of open ocean buoy applications. To meet the system requirements, an 18-element microstrip antenna (9-element transmit, 9-element receive) was designed and fabricated under subcontract by Seavey Engineering Associates, Inc. It operates in the 4-6 GHz frequency band (C-band) and provides 14 dB of gain. The % power beamwidth is j150 in azimuth and elevation. This antenna design, in conjunction with a simple rotating mount, was used to evaluate the potential of this approach to keep a geostationary satellite in view when mounted on an ocean buoy. The evaluation is based on laboratory measurements using a magnetic compass and a small stepper motor to maintain antenna orientation while the complete assembly was rotated and tilted at speeds similar to what would be expected on an offshore buoy equipped with a stabilizing wind vane.

Download or read book Water Spectrum written by and published by . This book was released on 1981 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation Comparison and Calibration of Oceanographic Instruments written by Society for Underwater Technology (SUT) and published by Springer Science & Business Media. This book was released on 1986-01-31 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book International Ocean Systems Design written by and published by . This book was released on 1999 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of a Mobile Coastal Communications Buoy written by Meghan Hendry-Brogan and published by . This book was released on 2005 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The NEC buoy displaces approximately 140 kg of sea water and is roughly 11 feet long when fully assembled, not including its 5 foot antenna mast. The buoy employs a PC104 stack to control an 802.1 lb wireless card and antenna, an acoustic modem card and transducer, other peripheral instrumentation, a main battery, and a solar power system.

Download or read book Science and Technology for a New Oceans Decade p 1 to 280 written by Marine Technology Society and published by . This book was released on 1990 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Instrumentation 90 written by and published by . This book was released on 1990 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Directional Ocean Wave Spectra written by Robert C. Beal and published by . This book was released on 1991 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Das Buch enthält insgesamt 33 Vorträge, die anlässlich des Symposiums "Measuring, Modeling, Predicting, and Applying Directional Ocean Wave Spectra" gehalten wurden, welches von 19890418 bis 19890420 am Applied Physics Laboratory der Johns Hopkins Universität stattfand. Das Symposium war den Ergebnissen des Labrador Sea Extreme Waves Experiment (LEWEX) gewidmet, welches mit internationaler Beteiligung unter Einsatz von zwei Schiffen, zwei Radar- Fernerkundungsflugzeugen sowie Radar-Fernerkundungssatelliten im März 1987 in der Labradorsee durchgeführt wurde. Ziel war die Bestimmung von richtungsbezogenen Meereswellenspektren. Nach zwei einführenden Vorträgen in das Experiment LEWEX sowie in die Bedeutung der Wellenspektren widmen sich die übrigen Fachbeiträge folgenden Themen: Physik von Wind und Wellen (Wind-Wave Physics); Seegangsverhalten und Messungen an der Meeresoberfläche (Seakeeping and Surface Measurement); Luftgestützte und weltraumgestützte Radarmessungen (Air and Space Measurement); Numerische Modellrechnungen (Numerical Model Estimates); Zukünftiger Forschungsbedarf (Future Directions). 300 der während LEWEX gemessenen 2000 Wellenspektren werden vorgestellt und verglichen.

Download or read book Oceans 78 written by and published by . This book was released on 1978 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oceans written by and published by . This book was released on 1978 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings 1983 Symposium on Buoy Technology written by Symposium on Buoy Technology and published by . This book was released on 1983 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Symposium on Geodesy for Earthquake and Natural Hazards GENAH written by Manabu Hashimoto and published by Springer. This book was released on 2016-12-09 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain a selection of peer-reviewed papers presented at the International Symposium on Geodesy for Earthquake and Natural Hazards (GENAH), Matsushima, Japan, 22-26 July, 2014. The scientific sessions focused on monitoring temporal and spatial changes in Earth's lithosphere and atmosphere using geodetic satellite systems, high rate GNSS as well as high resolution imaging (InSAR, Lidar). Researchers in various fields of geodesy discussed the role of geodesy in disaster mitigation and how groups with different techniques can collaborate toward such a goal.

Download or read book Maritime Information Review written by and published by . This book was released on 2000 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Antennas written by Boris Levin and published by CRC Press. This book was released on 2021-04-02 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book comprises a new method of solving the integral equation of Leontovich, the most rigorous and most effective equation for the current in thin linear antennas. The book describes the features of the new method in its application in various types of antennas. It considers new ways of analyzing antennas, in particular in the calculation of an antenna gain based on main radiation patterns and the calculation of the directional characteristics of radiators with known distribution of current amplitude. The method of electrostatic analogy proposed by the author, provides the base for comparison of electromagnetic fields of high-frequency currents and electrostatic charges located on linear conductors to improve the directional characteristics of log-periodic and director-type antennas. A new approach to the analysis of the electrical characteristics of a microstrip antenna, which allows expansion of its operation range, is substantiated and developed. New results of antenna synthesis are obtained. The second part of the book is devoted to specific types of antennas (the author had a significant role in their creation). Particular attention is given to ship antennas for different frequency ranges. The book is intended for professionals, working in electrodynamics and those working on development, placement and exploitation of antennas. It will be useful for lecturers (university-level professors), teachers, students of radio engineering and researchers working in various fields of radio electronics and interested in an in-depth study of theoretical problems and designs f antennas. It can also be used for short university courses.

Download or read book The Federal Plan for Meteorological Services and Supporting Research written by and published by . This book was released on with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: