Analysis of JANUS and underwater telephone capabilities and co-existence

Abstract

This document aims at offering a concise look into the co-existence of Underwater Telephone and JANUS digital communication methods. This topic is of particular interest as both methods (one a well-established STANAG and the latter in the process to become a STANAG) have partially overlapping frequency bands. The two techniques are briefly described and the specific interference mitigation strategies built-in in JANUS are presented. The document then focuses on a series of experiments conducted during the REP14-Atlantic sea trials. These experiments had two main objectives: 1) Measuring the impact of an interfering JANUS signal on the intelligibility of voice messages and 2) assessing the capabilities of both techniques under similar conditions and validation of the JANUS Medium Access Control scheme. Experimental setup, analysis and results are presented for the different activities.