Reception at Ascension Island, South Atlantic, of the Transmissions from theHeard Island Feasibility Test

摘要

The objective of the Heard Island Feasibility Test (HIFT) is to ensonify theglobal ocean with a single source to determine the feasibility of measuring the extent of ocean warming due to the greenhouse effect. The signal-to-noise ratios and the precision of arrival times measured at the listening stations will help determine the feasibility of a long-term effort to monitor average oceanic temperature change. The report describes the observational effort undertaken at Ascension and discusses general features of the data set collected there. Emphasis is on the spectral characteristics of the received signals and their temporal characteristics before demodulation.