Accession Number : AD0704094

Title :   AN INVESTIGATION INTO THE FEASIBILITY OF PROCESSING WAVE INTERACTION DATA IN DIGITAL FORM,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK IONOSPHERE RESEARCH LAB

Personal Author(s) : Croskey,C. L.

Report Date : 20 MAR 1970

Pagination or Media Count : 68

Abstract : The wave interaction experiment at the Ionosphere Research Laboratory presently operates in analog form. Tuned filters and coherent detection are used to obtain the delta amplitude of returned radio pulses which have been disturbed by wave interaction in the ionosphere. As investigation was conducted concerning the feasibility of processing the wave interaction data in digital form. Various related instrumentation schemes are briefly considered. A system is proposed which obtains a digital number proportional to the average value of each returned radio pulse. This data is conveyed to a digital computer or arithmetic processor. Special computer programs called digital filters can then be used to analyze the data. A simple digital filter system is discussed. A guard section removes the strong DC component. Then the digital equivalent of coherent detection is performed. A lowpass output filter provides most of the S/N improvement. A prototype is described which was built to formalize some of the ideas about such a system. (Author)

Descriptors :   (*IONOSPHERE, ELECTRON DENSITY), (*ATMOSPHERIC SOUNDING, DATA PROCESSING), DIGITAL SYSTEMS, ELECTRIC FILTERS, FEASIBILITY STUDIES

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE