A Joint Time Synchronization and Localization Design for Mobile Underwater Sensor Networks
A Joint Time Synchronization and Localization Design for Mobile Underwater Sensor Networks
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DOI：
10.1109/tmc.2015.2410777
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发表时间：
2016-03-01
影响因子：
7.9
通讯作者：
Yang, Bo
中科院分区：
文献类型：
--
作者：
Liu, Jun;Wang, Zhaohui;Yang, Bo
时间同步和定位是传感器网络系统的基本服务。虽然他们经常相互依赖，但他们通常是独立解决的。在这项工作中，我们研究了水下传感器网络中的时间同步和定位问题，由于水环境的独特性，这给水下传感器网络带来了更多的挑战。这些挑战包括长传播延迟和传输延迟、低带宽、能量限制、移动性等。本文提出了一种考虑水下介质分层效应的定位和时间同步联合解决方案，以补偿假设声波在水环境中以直线传播引起的距离估计偏差。将时间同步与定位相结合，共同提高了两者的精度。此外，为了提高移动情况下的定位精度，采用了一种先进的交互式多模型（IMM）跟踪算法。此外，通过结合这两种服务，所需的交换消息数量大大减少，从而节省了能源消耗。仿真结果表明，该方案对两种业务都有较好的改善和效益。
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 work, we investigate the time synchronization and localization problems in underwater sensor networks, where more challenges are introduced because of the unique characteristics of the water environment. These challenges include long propagation delay and transmission delay, low bandwidth, energy constraint, mobility, etc. We 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. Additionally, an advanced tracking algorithm interactive multiple model (IMM) is adopted to improve the accuracy of localization in the mobile case. Furthermore, by combining both services, the number of required exchanged messages is significantly reduced, which saves on energy consumption. Simulation results show that both services are improved and benefit from this scheme.