Wireless Sensor Networks (WSNs) are often deployedrandomly;this makes the
positiondetermination of deployed nodes a very difficult issue, which is called localization
problem. The importance of node localization information becomes from the facilit
y of
routing operation and the network control, that makes the network works correctly.
Nowadays, Global Position System (GPS) is appeared as the most important position
system, but it is inapplicable for the low-cost self-configure sensor networks, and also it is
impossible to install GPS for each sensor nodebecause of high cost, large volume and high
complexity required of adding it to nodes, especially for large network.Therefore, a few
number of nodes may be configured with GPS.
In this paper,we will study the localization algorithmAd-hoc Positioning System
(APS) algorithmused inUnderwater WSN, andwill testthe effectiveness of usingitin
determining the node position based on the distance calculated by anchor nodes. These
nodes are the nodes which know their positions.
