Abstract
In oceans, the limited acoustic spectrum resource is heavily shared by marine mammals and manmade systems including underwater sensor networks. In order to limit the negative impact of acoustic signal on marine mammals, we propose an environmentally friendly power control (EFPC) scheme for underwater sensor networks. EFPC allocates transmission power of sensor nodes with a consideration of the existence of marine mammals. By applying a Nash Equilibrium based utility function with a set of limitations to optimize transmission power, the proposed power control algorithm can conduct parallel transmissions to improve the network’s goodput, while avoiding interference with marine mammals. Additionally, to localize marine mammals, which is a prerequisite of EFPC, we propose a novel passive hyperboloid localization algorithm (PHLA). PHLA passively localize marine mammals with the help of the acoustic characteristic of these targets. Simulation results show that PHLA can localize most of the target with a relatively small localization error and EFPC can achieve a close goodput performance compared with an existing power control algorithm while avoiding interfering with marine mammals.
Highlights
Under Water Sensor Networks (UWSNs) have become a very active research area during the past decade because of their wide applications including scientific/commercial exploration, disaster prediction, environmental monitoring and oceanography data collection [1,2,3]
We will first evaluate passive hyperboloid localization algorithm (PHLA) algorithm in terms of localization precision and success ratio, which is defined as the ratio of the number of points that are correctly localized to the total number of points that need to be localized
We develop a novel environmentally friendly power control scheme, EFPC, and a corresponding passive localization algorithm, PHLA, for UWSNs
Summary
Under Water Sensor Networks (UWSNs) have become a very active research area during the past decade because of their wide applications including scientific/commercial exploration, disaster prediction, environmental monitoring and oceanography data collection [1,2,3]. Many existing power control schemes dedicated to UWSNs [10,11,12] aim to save network energy These approaches may not maximize the network throughput, which is one of the most important metric of network performance. The proposed scheme aims to better reuse spatial resource while avoiding negative impact of acoustic signal on marine mammals by controlling transmission power. This is hard to implement in real systems due to the energy and computation limitations To solve this problem, we propose a simple localization method in this paper that reduces data transmission among nodes and does not require stringent synchronization. PHLA is a distance measuring based localization algorithm that does not need to known the sending time or the sending power level of the acoustic signal produced by marine mammals.
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