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Author : Patricia L. Rice,Anita G. Longley,K. A. Norton,A. P. Barsis
Publisher : Unknown
Page : 196 pages
File Size : 49,7 Mb
Release : 1965
Category : Tropospheric radio wave propagation
ISBN : PSU:000071843704
Author : United States. National Bureau of Standards
Publisher : Unknown
Page : 198 pages
File Size : 50,9 Mb
Release : 1965
Category : Electronic
ISBN : UIUC:30112106608786
Author : Institute for Telecommunication Sciences and Aeronomy (U.S.)
Publisher : Unknown
Page : 128 pages
File Size : 42,9 Mb
Release : 1900
Category : Tropospheric radio wave propagation
ISBN : LCCN:68060209
Author : Patricia L. Rice
Publisher : Unknown
Page : 128 pages
File Size : 50,8 Mb
Release : 1965
Category : Tropospheric radio wave propagation
ISBN : OCLC:654917842
Author : P. L. Rice,A. G. Longley,K. A. Norton,A. P. Barsis,INSTITUTE FOR TELECOMMUNICATION SCIENCES AND AERONOMY BOULDER CO.
Publisher : Unknown
Page : 197 pages
File Size : 43,8 Mb
Release : 1967
Category : Electronic
ISBN : OCLC:227536822
Curves that may be useful for establishing preliminary allocation plans were prepared for a fixed combination of antenna heights and assume propagation over a smooth earth. They make no allowance for a wide range of propagation path profiles or atmospheric conditions that may be encountered over particular paths. A method for computing preliminary reference values of transmission loss is described. It is based on a simple model, may readily be programmed, and is especially useful when little is known of the details of terrain.
Author : Anonim
Publisher : Unknown
Page : 128 pages
File Size : 42,6 Mb
Release : 1967
Category : Electronic
ISBN : OCLC:832642171
Author : Patricia L. Rice
Publisher : Unknown
Page : 432 pages
File Size : 49,6 Mb
Release : 1966
Category : Tropospheric radio wave propagation
ISBN : UOM:39015003404335
Author : Patricia L. Rice
Publisher : Forgotten Books
Page : 198 pages
File Size : 49,5 Mb
Release : 2017-10-28
Category : Electronic
ISBN : 0266867286
Excerpt from Transmission Loss Predictions for Tropospheric Communication Circuits, Vol. 1 Note: This Technical Note consists of two volumes as indicated in the Table of Contents. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author : Albrecht P. Barsis,Kenneth Alva Norton,Patricia L. Rice
Publisher : Unknown
Page : 36 pages
File Size : 54,6 Mb
Release : 1958
Category : Radio wave propagation
ISBN : UOM:39015086508622
Author : Albrecht P. Barsis,Patricia L. Rice,Kenneth Alva Norton
Publisher : Unknown
Page : 82 pages
File Size : 43,8 Mb
Release : 1959
Category : Radio wave propagation
ISBN : UOM:39015086508630
Author : Institute for Telecommunication Sciences and Aeronomy (U.S.)
Publisher : Unknown
Page : 206 pages
File Size : 47,7 Mb
Release : 1967
Category : Tropospheric radio wave propagation
ISBN : UOM:39015077289539
Author : A. P. Barsis
Publisher : Unknown
Page : 164 pages
File Size : 52,7 Mb
Release : 1961
Category : Radio waves
ISBN : UIUC:30112106608802
Performance of long-distance tropospheric communication circuits, either singly or in tandem, is predicted in terms of the probability of obtaining a specified grade of service or better for various percentages of time. The grade of service is determined by the minimum acceptable ratio of hourly median predetection-RMS-signal-to-RMS-noise for the type of intelligence to be transmitted. The standard deviation of prediction errors depends upon the percentage of hours the specified grade of service is required and on parameters characterizing the propagation path. The possibility of reducing this standard deviation by making path-loss measurements is discussed. It is shown that no improvement is possible unless the test path is very nearly the same as the proposed operational path; in particular, unless the test path and operational paths have terminals less than one mile apart it is shown to be doubtful in most cases whether the observations will be useful in improving the reliability of the predicted performance of the proposed system. Assuming that the test path and proposed operational paths are identical, estimates are given of the number of days of observations required to halve the prediction uncertainty or, alternatively, to reduce it to 3 db; in some cases several years of observations are required. A tutorial discussion is given in Appendix III of the concepts of the effective noise figure and the effective input noise temperature of a receiving system.
Author : A. P. Barsis
Publisher : Unknown
Page : 128 pages
File Size : 47,8 Mb
Release : 2019
Category : Radio waves
ISBN : OCLC:1132808583
The uncertainty in predicting the performance of tropospheric communication circuits may be expressed by a variance, assuming a log-normal distribution of the differences between calculated and measured values of field strength or basic transmission loss, if a number of paths with identical geometrical and other prediction parameters are considered. It is shown to what extent this variance may be reduced by taking into account transmission loss measurements over the same path for which the prediction is intended, or over a similar path. The improved prediction is obtained by assigning weights to calculated and observed values, respectively, and forming a weighted average. The method is demonstrated by examples, and the results are used to calculate new values of service probability on the basis of the improved prediction. Comparison of service probabilities for predictions based on the cal¿̐ư culation above, and for predictions taking into account the results of transmission loss measurements, enables the designer to judge whether the cost of a measurement program is justified in terms of possible savings in equipment for a final installation.
Author : A. P. Barsis
Publisher : Unknown
Page : 128 pages
File Size : 53,8 Mb
Release : 2019
Category : Radio waves
ISBN : OCLC:1132808582
Comparison of calculated and measured values of transmission loss for tropospheric propagation paths shows that there is an appreciable amount of uncertainty in the prediction process. Departures of observed from predicted values may be regarded as normally distributed when expressed in decibels, and this paper considers methods of estimating these standard deviations. In order to predict the performance of a communication system over a given path, it is necessary to define the grade of service, the time availability of this grade of service and the reliability of the predictions. The short-term (within-the-hour) signal fading is conveniently included in the definition of the grade of service, in terms of a required hourly median r.m.s.-carrier to r.m.s.-noise ratio. Next, the time availability of a given grade of service is specified in terms of the percentage of hours in a year that this minimum carrier-to-noise ratio is exceeded. To determine the time availability it is necessary to obtain the distributions with time of hourly medians for the path with given geometrical and meteorological characteristics. In this paper the three concepts, grade of service, time availability, and reliability of prediction are brought together in a single graphical representation. The graph has two probability scales; the ordinate shows the percentage of hours service is available (time availability), and the abscissa shows the service probability (reliability of the prediction), where each curve corresponds to a system with given operating characteristics such as transmitter power, antenna size, etc. Each curve could therefore be labeled by a figure representing installation and operating costs, and various systems may thus be compared on the basis of cost versus probability of successful operation.
Author : Wilbert F. Snyder
Publisher : Unknown
Page : 884 pages
File Size : 54,6 Mb
Release : 1986
Category : Ionospheric radio wave propagation
ISBN : CUB:P204191805009