Accession Number : ADP002732

Title :   Determination of Propagation Limitations at HF (High Frequency) by Real-Time Update of a Computer Model from Oblique Sounder Data,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Uffelman,D. R.

Report Date : AUG 1983

Pagination or Media Count : 12

Abstract : The Naval Research Laboratory has an active program which involves an assessment of the HF propagation channel by coupling computer models of the channel to data obtained from oblique sounders. Currently, this technique draws upon models of maximum usable frequency (MUF) resident in programs such as IONCAP and the Naval Ocean Systems Center (NOSC) PROPHET SYSTEM (MINIMUF 3.5) and relates this model to real-time measurements of the maximum observed frequency (MOF) over a reference path. Measurements from the reference path are used to update the models and the driving parameters which are ascertained from this process are used to access the maximum observed frequency over paths disjoint from the reference path. In the experimental approach, NRL employs a network of oblique sounders to determine the success of the technique. One link in the network is designated the control path and the other links are designated as experimental paths to which the results of the model update are compared.

Descriptors :   *Ionospheric propagation, *F region, *Computerized simulation, *Ionospheric models, Channels, Sounding, High frequency, Coupling(Interaction), Real time, Naval Research Laboratories, Propagation, Parameters, Frequency, Measurement, Limitations, Paths, Determination, Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE