Accession Number : ADA311650

Title :   The Autoscaling of Oblique Ionograms,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Redding, Nicholas

PDF Url : ADA311650

Report Date : MAR 1996

Pagination or Media Count : 146

Abstract : This report details the work done on developing an autoscaling system for the Low-Latitude Ionospheric Sounding Program (LLISP). The report firstly describes the performance of a number of different filtering routines for automatic cleaning of LLISP oblique ionograms. Secondly, it then presents techniques developed to automatically extract a feature vector from a filtered ionogram. A third stage uses the feature vectors to identify the prominent modes and other important features of the ionograms, and to track these modes and features as they evolve across sequences of ionograms. This work will automate the task of identifying and tracking ionospheric propagation modes in ionograms. The resulting system will be used to process current LLISP data streams to extract large volumes of significant information: this will help the understanding of ionospheric processes and can be used as input to automatic frequency management systems for communications networks.

Descriptors :   *IONOGRAMS, *ATMOSPHERIC SOUNDING, DATA PROCESSING, TRACKING, COMMUNICATIONS NETWORKS, AUSTRALIA, FREQUENCY ALLOCATION, IONOSPHERIC PROPAGATION.

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE