Accession Number : ADA261356


Title :   Feasibility Study of Non-Invasive Telemetry Techniques for Use With Submarine Telephone Cables


Descriptive Note : Technical rept.,


Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA


Personal Author(s) : Brown, Neil L ; Frye, Daniel E ; Proakis, John


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261356.pdf


Report Date : Jan 1993


Pagination or Media Count : 44


Abstract : The feasibility of using inductive coupling with existing submarine telephone cables for telemetry of data from ocean sensors was investigated. The submarine telephone cable was simulated with a computer model and the model results were tested experimentally by deploying 600 meters of coax cable in Woods Hole Harbor. In parallel a study of the optimum access methods and modulation and techniques was performed. Results of the feasibility study showed that a non-invasive technique for inductive coupling is not feasible for use with existing SF and SD coaxial cable designs. Signals induced in both conductors by a toroid encircling the cable remain identical as they propagate along the cable as a result of mutual inductance. Thus, no signals are apparent at the repeaters. Optimal use of cable bandwidth combines time division multiple access with trellis-coded QAM modulation.


Descriptors :   *CABLES , *UNDERWATER CABLES , COMPUTERIZED SIMULATION , UNDERWATER EQUIPMENT , DETECTORS


Subject Categories : Machinery and Tools


Distribution Statement : APPROVED FOR PUBLIC RELEASE