异步无线雷达传感器网络中目标定位的功率分配

Liyuan Song, Tingting Zhang, Qinyu Zhang
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引用次数: 1

摘要

恶劣环境下的目标检测与定位是无线雷达传感器网络的重要组成部分。针对多传感器节点间难以实现高精度时钟同步的问题,提出了一种基于往返测量(RTM)和到达时差(TDOA)相结合的异步测量模型。然后,我们研究了基于RTM-TDOA模型的目标定位的基本精度限制。为了在目标定位精度和能量消耗之间取得平衡,提出了一种传感器节点间最优功率分配框架。此外,针对目标的位置不确定性,给出了相应的鲁棒功率分配策略。证明了这两个功率分配问题都是凸的,可以有效地求解。我们验证了分析,并通过数值结果评估了所提出策略的性能。本文提出的框架也可以实现有意义的性能基准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Power Allocation for Target Positioning in Asynchronous Wireless Radar Sensor Networks
Target detection and positioning in harsh environments plays a main role in wireless radar sensor networks (WRSNs). Due to the difficulties in high accuracy clock synchronization among multiple sensor nodes, a novel asynchronous measurement model based on a combination of round trip measurements (RTM) and time difference of arrival (TDOA) is presented in this paper. We then investigate the fundamental accuracy limits of target localization based on the RTM-TDOA model. In order to achieve the tradeoff between the target localization accuracy and energy consumption, an optimal power allocation framework among the sensor nodes is thus presented. Furthermore, a corresponding robust power allocation strategy is also given to deal with the position uncertainty of the target. Both power allocation problems are proved to be convex and can be solved efficiently. We validate the analysis, and evaluate the performance of the proposed strategies through numerical results. Meaningful performance benchmarks can also be achieved by the presented frameworks in this paper.
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