CHURCH ANCHOR Explosive Source (SUS) Propagation Measurements from R/P Flip
2006
Morris, G. B.
As part of the CHURCH ANCHOR Exercise conducted in the central Northeastern Pacific Ocean during August and September 1973, the received signals from underwater explosive sources (SUS) detonated at a nominal depth of 18 meters were analyzed for signal propagation measurements. The signal received at four hydrophones were detected, digitally sampled and processed on-line by a digital minicomputer system aboard the Research Platform FLIP. The four hydrophone depths 775 meters, 2492 meters, 4250 meters, and 5180 meters, correspond to depths near the sound channel axis, a depth roughly midway between the axis and the critical depth, near the critical depth, and 142 meters above the bottom, respectively. Analyses were made at selected frequencies in the band from 10 Hz to 400 Hz. Signal propagation characteristics and signal-to-noise ratios were examined as a function of source-to-receiver range, receiver depth, and frequency. Bathymetric or changing water mass effects on the sound propagation were also noted.
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