EM-Based High Speed Wireless Sensor Networks for Underwater Surveillance and Target Tracking

Table 2

A summary of the key features of the proposed architectures.

Architectures	Spacing between two ENs	Spacing between two CHs	Total number of ENs and CHs	Directional receiving antennas in CHs	Information used for location estimation
				No	Location of CHs
				No	Location of CHs and EM power received at CHs
				No	Location of CHs
				Four directional antennas at each CH	Location of ENs contributing the strongest EM signal
				Eight directional antennas at each CH	Location of ENs contributing the strongest EM signal