Download or read book An Experimental Determination of Meteor Daily Arrival Rate Variation written by John M. Quinn and published by . This book was released on 1993 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Experimental Determination of Meteor Daily Arrival Rate Variation written by John Michael Quinn and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Research Papers written by and published by . This book was released on 1993 with total page 34 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 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Determination of Waiting Times for Meteor Trail Returns of Specified Durations written by J. C. Ostergaard and published by . This book was released on 1991 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1994 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radio Science written by and published by . This book was released on 1997 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Digital Signal Design for Meteor scatter Communications written by Jay Michael Jacobsmeyer and published by . This book was released on 1987 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is concerned with the efficient design of digital modulation and error-control schemes for point-to-point meteor-scatter communication systems. The methods introduced exploit the unique properties of the meteor-scatter channel. A channel model is derived based on the work of other researchers. The channel model includes expressions for meteor arrival rate, burst duration, and received power. Meteor arrivals are modeled as a Poisson random process and the properties of the Poisson process are used extensively. Channel noise is modeled as additive, white, and Gaussian distributed. The multipath structure of the channel is evaluated only to the extent that it affects channel bandwidth. New expressions for long run average bit rate and mean message waiting time. Bounds on the improvement in mean waiting time over the fixed-rate modem are derived. M-ary modulation methods are investigated to find the optimal modulation for the fixed-rate modem and adaptive-symbol-rate modem. It is shown that the adaptive-symbol-rate modem is not optimal on a bandwidth-limited channel. An alternative scheme, called adaptive quadrature amplitude modulation (QAM) is evaluated and shown to outperform adaptive-symbol-rate modulation on a bandwidth-limited channel. (rh).

Download or read book IRE Transactions on Antennas and Propagation written by Institute of Radio Engineers. Professional Group on Antennas and Propagation and published by . This book was released on 1960 with total page 1334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Symposium on the Astronomy and Physics of Meteors Held at Smithsonian Astrophysical Observatory Cambridge Massachusetts 28 August 1 September 1961 written by and published by . This book was released on 1962 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1969 with total page 1002 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book COMSIG written by and published by . This book was released on 1990 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Middle Atmosphere Program written by and published by . This book was released on 1981 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Communications fusing Command Control and Intelligence written by and published by . This book was released on 1992 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Survey of the Literature of the Ionosphere written by Stanford University. Radio Propagation Laboratory and published by . This book was released on 1955 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Properties and Interactions of Interplanetary Dust written by L. Giese and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigation of the interplanetary dust cloud is characterized by contributions from quite different methods and fields, such as research on zodiacal light, meteors, micrometeoroids, asteroids, and comets. Since the earth's environment and interplanetary space became accessible to space vehicles these interrelations are clearly evident and extremely useful. Space measurements by micrometeoroid detectors, for example, provide individual and eventually detailed information on impact events, which however are limited in number and therefore restricted in statistical significance. On the other hand, zodiacal light measurements involve scattered light from many particles and therefore provide global information about the average values of physical properties and spatial distribution of interplanetary grains. Additional knowledge stems from lunar samples and from dust collections in the atmosphere and in deep sea sediments. All these sources of complementary information must be put together into a synoptical synthesis. This also has to take into account dynamical aspects and the results of laboratory investigations concerning physical properties of small grains. Such considerable effort is not merely an academic exercise for a few specialists interested in the solar dust cloud. Since this same cloud exclusively allows direct in-situ acess to investigate extraterrestrial dust particles over a wide range of sizes and materials, it provides valuable information for realistic treatment of dust phenomena in other remote cosmic regions such as in dense molecular clouds, circumstellar dust shells, and even protostellar or protoplanetary systems.