Accession Number:

ADA133168

Title:

Theoretical Predictions for VLF Radio Propagation

Descriptive Note:

Phase rept.

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA COMMUNICATION NAVIGATION TECHNOLOGY DIRECTORATE

Personal Author(s):

Report Date:

1983-08-22

Pagination or Media Count:

87.0

Abstract:

The very low frequency VLF, 3 to 30 kHz part of the radio frequency spectrum is characterized by low attenuation rate, high phase and frequency stability, and high signal to noise ratio. Consequently, VLF radio propagation is used for many practical applications, e.g., frequency standardization, clock synchronization, and reliable long-distance radio communications. Because of the distinct advantages of VLF radio propagation, the U.S. Navy will be conducting a balloon-to-balloon-borne cross link communication experiment to study the characteristics of VLF altitude radio propagation. In this Technical Report, an attempt has been made to make theoretical computations of the vertical components of the individual and multimode field strengths as a function of distance based on mode theory. The variations of various ionospheric parameters, e.g., attenuation rates, the heights of the ionospheric reflection point, the height gain factors for an appropriate combination of the transmitting and receiving antenna elevations, along with the presence of the earths geomagnetic field, especially for the East-West propagation, have been duly considered.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE