Propagation of Transient Signals through Nonlinear, Ionized Media.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1981
- Accession Number
- ADA106754
Entities
People
- Robert E. McIntosh
Organizations
- University of Massachusetts Amherst