FY77Subsea Slow-Scan Acoustic Television (SUBSAT) Tests.

摘要

Experiments were conducted in December 1976 and January 1977 to test the feasibility of transmitting and receiving slow-scan television (SSTV) through existing underwater telephones (UQCs). Off-the-shelf monitors, recorders, and scan converters were installed on two submersibles and two surface craft. The slow-scan hardware was installed without modification to the UQCs and without disabling the normal UQC voice function. The slow-scan data rate was 7200 baud and occupied a 2.5-MHz bandwidth, fully compatible with existing UQC equipment. Twenty-six test transmissions, each consisting of a number of slow-scan frames, were made during the tests. While some of the pictures were of excellent quality, most were degraded because of multipath effects. Analysis of the data indicates that better pictures would have been obtained had the acoustic path been more nearly vertical. Further experiments are planned. (Author)