The on of the Research Laboratories is t) study the oceans, inland waters, the lower and r atmosphere, the space environment, and the earth, in search of the under-A 1 ~m .;i~ l ed to provide more useful services in Improving man's prospects for survival v =as nflue by the physical environment. Laboratories contributing to these studies are:Erh nces Laoboratories: Gteomagnetism, seismology, geodesy, and related earth sc ences; quake processes, internal structure and accurate figure of the Earth, and / . dltributi dtthe Earth's mass. Aeronomy Laboratory: Theoretical, laboratory, rocket, and satellite studies of the physical and chemical processes controlling the ionosphere and exosphere of the earth and other planets.Wave Propagation Laboratory: Development of new methods for remote sensing of the geophysical environment; special emphasis on propagation of sound waves, and electromagnetic waves at millimeter, infrared, and optical frequencies.Institute for Telecommunication Sciences: Central federal agency for research and servIces in propagation of radio waves, radio properties of the earth and its atmosphere, nature of radio noise and interference, information transmission and antennas, and methods for the more effective use of the radio spectrum for telecommunications. "Research Flight Facility: Outfits and operates aircraft specially instrumented for research; and meets needs of ESSA and other groups for environmental measurements for aircraft. (Miami, Florida)'• Distr.;ution of This Report is Unlimited
Abstruct--A study has been undertaken to assess the effects of the ionosphere on the performance of a direct broadcasting satellite service operating in the high frequency (HF) band. Results relating to two issues of performance are presented: 1) determining under wjhat conditions a frequency allocated to the broadcasting service can be expected to reach the surface of the earth from a satellite and 2) the loss of signal strength due to passage through the ionosphere.It was found that if high frequency broadcast services are to be provided on a worldwide basis using satellite platforms, the satellites need to be optimally configured for the intended service area. Also, a 3 dB loss of signal strength is expected due to ionospheric absorption.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.