Accession Number : AD0430222

Title :   A STUDY OF INTERFERENCE IN THE ALOUETTE TOPSIDE SOUNDER RECORDS,

Corporate Author : DEFENCE RESEARCH TELECOMMUNICATIONS ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Hartz, T. R.

Report Date : OCT 1963

Pagination or Media Count : 14

Abstract : The Alouette ionograms and AGC recordings obtained under nighttime conditions are found to be of poor quality because of unidentified man-made interference. This study shows that such interference is mainly prevalent over densely populated regions of the world and seriously degrades the night-time ionograms obtained at stations like Ottawa and Winkfield, but is not apparent in recordings from the South Atlantic station. The most probable cause of the interference is ground transmissions that propagate above the F-region critical frequency and intermodulate in the satellite receiver. No evidence has been found for a contribution to the interference by way of the whistler mode of propagation. (Author)

Descriptors :   *IONOSPHERE, *PHYSICAL PROPERTIES, *MEASURING INSTRUMENTS, *RADIOSONDES, *RECONNAISSANCE SATELLITES, NOISE(RADIO), ATMOSPHERIC SOUNDING, RECORDING SYSTEMS, FREQUENCY, RADIOFREQUENCY INTERFERENCE, IONOSPHERIC PROPAGATION.

Distribution Statement : APPROVED FOR PUBLIC RELEASE