Accession Number : AD0727013

Title :   Low Frequency Ionospheric Sounding System.

Descriptive Note : Final rept. 18 Sep 67-31 Jul 70,

Corporate Author : LOWELL TECHNOLOGICAL INST RESEARCH FOUNDATION MASS

Personal Author(s) : Bibl,Klaus ; Vargas-Vila,Richard

Report Date : JUN 1971

Pagination or Media Count : 40

Abstract : The report describes a low frequency vertical pulsed sounder which makes possible soundings of the ionospheric D-region. The system employs the most recent advancements in solid state analog components and digital arrays. It features a digital intergrating scheme which is accomplished by generation of a median value of signal from 800 pulses or a multiple thereof. By this means, more than 30 dB in available signal to noise ratio is obtained. With selectable sample spacing as small as 1.5 km, both the normal and abnormal components are separately integrated with quadrature sampling in each of 40 height intervals. Other features of the phase coherent sounder include a pseudo-random phase coding for suppression of phase coherent interference and multiple hop echoes. (Author)

Descriptors :   (*ATMOSPHERIC SOUNDING, IONOSPHERE), (*DATA PROCESSING, ATMOSPHERIC SOUNDING), LOW FREQUENCY, ANTENNAS, RADIO TRANSMITTERS, RADIO RECEIVERS, INTEGRATED CIRCUITS, DATA STORAGE SYSTEMS, PERFORMANCE(ENGINEERING)

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE