Accession Number : AD0865147
Title : Examination of VLF/LF Propagation Effects as a Function of Frequency.
Descriptive Note : Technical pub.,
Corporate Author : NAVAL WEAPONS CENTER CORONA LABS CA
Personal Author(s) : Hildebrand, Verne E. ; Morfitt, David G.
Report Date : DEC 1969
Pagination or Media Count : 80
Abstract : Technological development in VLF/LF engineering has progressed sufficiently so that a practical interest in the design and construction of wide-band communication systems has developed. The report demonstrates that the variability in phase and amplitude of propagated VLF/LF radio waves needs careful evaluation when wide-band modulation schemes are considered. This variability is examined as a function of frequency for a variety of environmental parameters by two methods. The first method is by an analytical study using a theoretical wave hop propagation model for establishing general concepts of conditions which may be encountered, and the second is an examination of propagation data acquired with a VLF/LF multifrequency sounder. (Author)
Descriptors : (*RADIO TRANSMISSION, VERY LOW FREQUENCY), COMMUNICATION AND RADIO SYSTEMS, LOW FREQUENCY, IONOSPHERIC PROPAGATION, PERIODIC VARIATIONS, ATMOSPHERIC SOUNDING, MATHEMATICAL MODELS, PHASE.
Subject Categories : Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE