Abstract
Long range acoustic transmission loss measurements were made in the northern Denmark Strait area utilizing two aircraft. One aircraft flew prearranged tracks, dropping standard U. S. Navy explosive charges, while the second aircraft remained in the area of deployed calibrated sonobuoys, acting as a receiving platform. Received signals were recorded broad band aboard the monitoring aircraft. These broad-band recordings were analyzed by filtering, squaring, and integrating to obtain energy density in selected 13-oct bands. The Weston values of source level for the explosive charges were used in the calculation of transmission loss. Transmission loss data for several octaves are shown as well as the results of calculations of a loss per unit distance factor [J. D. MacPherson, J. Brit. IRE 26, 293 (1963)]. This factor is obtained by assuming spherical spreading to 1 kyd and cylindrical spreading thereafter and calculating the difference between this assumed transmission loss and the measured transmission loss.
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