Downloads & Free Reading Options - Results

Propagation-loss, noise, and signal-to-noise-ratio (S/N) measurements obtained in the Ionian Basin by using a continuous-wave (CW) projector, towed at a depth of 500 ft for seven days, and five receiving hydrophones, spanning the sound-channel axis at depths ranging from 270 to 2010 ft, are discussed. For these data, it is shown that the received signal level (L sub R) is at a maximum when the receiving hydrophone and source are both positioned near the sound- channel axis and that the noise level is lowest at the 1050- and 2010-ft depths. The S/N is optimum for the source-depth hydrophone and becomes progressively unfavorable for receivers positioned farther away from the channel axis.