Abstract
The strength and quality of the Ascension signals received from Heard Island were exceptional, probably because of low background noise as well as a propagation path relatively unobstructed by bathymetry and having a shorter segment in the Antarctic surface duct than eastward paths. Analysis of the cw and pentaline signals shows remarkable phase stability over a 9100-km path. Analysis of the m-sequence transmissions shows arrivals spread over about 8 s, roughly in agreement with propagation modeling for the path. Because of source motion, however, arrival structure does not show continuity from transmission to transmission. Coherence of phase and amplitude over four on-axis hydrophones spaced several kilometers apart is briefly examined, in anticipation of beamsteering and scintillation analyses.
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