Accession Number:

ADA106754

Title:

Propagation of Transient Signals through Nonlinear, Ionized Media.

Descriptive Note:

Final rept. 30 Sep 78-30 Jun 81,

Corporate Author:

MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s):

Report Date:

1981-06-30

Pagination or Media Count:

8.0

Abstract:

The diurnal and random motion of the ionosphere cause both translation and spreading of the frequency spectrum of signals transmitted through it. A predictive model was built and compared to experimental data and found to successfully predict frequency shifts and spreads induced by ionospheric inhomogeneities. Another model was developed to describe the reflection of HF pulses by a randomly inhomogeneous, dispersive and absorptive ionosphere. It is seen that delay distortion, diffuse multipath and frequency incoherence effects are small compared to the discrete multipath spread resulting from large scale variations of the ionospheric electron number density. In laboratory experiments the electron number density profile of a low pressure RF-generated Argon plasma was measured concurrently using microwave and optical diagnostic techniques. In a peripheral study, interesting results in antenna performance for efficient pulse radiation were found. Author

Subject Categories:

  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE