In underwater network, it is very important to know the location of unmanned underwater vehicle (UUV). The unknown position of UUV considered as an unknown node that can be determined from the known node locations through underwater acoustic network. The known node locations considered here as fixed positioned node. The range data is measured between unknown node and known nodes. By exploiting these measured range data and combination among fixed positioned nodes on this network, it is possible to perform underwater positioning of unknown node (UUV), similar to that of the satellite-based GPS program. The aim of this paper is to determine the position of UUV in an underwater acoustic network using combination method with different number of nodes, whose locations are known, to analyze the effect of node number in position estimation.

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Bandwidth is the most monumental topic both for the terrestrial and underwater communications. For proper network operation the estimation of number of signal sources (N) is very important. Most of the protocol based techniques are failed to give the desired results of node estimation due to underwater properties (long propagation delay, high absorptions and dispersion). Node estimation technique using crosscorrelation is not based on protocol, where infinite band Gaussian signals are used. But the underwater bandwidth is finite ( 1-15 kHz). This limited bandwidth can encumber the signal bandwidth which might invade the estimation process. In this paper, the number of estimated nodes is being obtained considering the effect of underwater bandwidth using three sensors.

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