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
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE