 | United States. Naval Electronic Systems Command - 1977 - 310 halaman
...acoustic communications. Tests have been made over long distances. A principal problem is communications coverage is uncertain, and high reliability of message...require 20 minutes to travel l,000 nautical miles. If acoustic projectors were located only near the continental US, they would not meet the short transmission... | |
 | United States. Congress. Senate. Committee on Armed Services - 1978 - 964 halaman
...ACOUSTICAL PROJECTORS Technology is available for underwater acoustical communication and tests tare been made over long distances. One of the principal...obtain. Acoustic signals require 20 minutes to travel 1,000 nautical miles. Location of all acoustical projectors near the continental US would thus preclude... | |
 | United States. Congress. House. Committee on Appropriations - 1978 - 826 halaman
...available for tinder-water acoustical communications and tests have been made over long distances. However, one of the principal problems is that communication...obtain. Acoustic signals require 20 minutes to travel 1,000 nautical miles and, thus, the location of all acoustical projectors would require a very long... | |
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... ACOUSTICS A number of schemes have been postulated to provide acoustical transmitters in the submarine operation areas. One such approach would place projectors and connect them cables. Technology is available for under-water acoustical communications... 