Date Added: Aug 2012
Time synchronization and localization are basic services in a sensor network system. Although they often depend on each other, they are usually tackled independently. In this paper, the authors investigate time synchronization and localization problems in underwater sensor networks. They propose a joint solution for localization and time synchronization, in which the stratification effect of underwater medium is considered, so that the bias in the range estimates caused by assuming sound waves travel in straight lines in water environments is compensated. By combining time synchronization and localization, the accuracy of both are improved jointly.