Dual-Tone Radio Interferometric Positioning Systems Using Undersampling Techniques

Dual-Tone Radio Interferometric Positioning Systems Using Undersampling Techniques
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使用欠采样技术的双音无线电干涉定位系统

DOI:
10.1109/lsp.2014.2332183
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发表时间:
2014-06
影响因子:
3.9
通讯作者:
Xinping Guan
Xinping Guan
中科院分区:
工程技术2区
文献类型:
--
作者:
Xiaoli Ma;Marie Shinotsuka;Cailian Chen;Xinping Guan

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高精度和低成本是无线传感器网络(WSNs)定位的挑战性要求。文献[1]提出的无线电干涉定位系统(RIPS)旨在同时满足这两方面的要求。然而,它很容易受到信道衰落的影响,并且由于平方运算而导致噪声加剧。本文提出了一种基于欠采样技术的双音无线电干涉定位系统uDRIPS。我们提出的方法不受平坦衰落影响,并通过直接对接收信号进行欠采样来避免测量噪声的放大。此外,从uDRIPS中接收的双音信号的相位中提取到达时间(TOA)信息。因此,它能够在同步锚(具有已知位置的节点)的帮助下定位异步目标。此外,我们还研究了由相位包裹引起的整周模糊度问题,并提出了一种交替估计未知量的定位算法。仿真结果验证了该算法的有效性。
High accuracy and low cost are challenging requirements for localization in wireless sensor networks (WSNs). The radio interferometric positioning system (RIPS) proposed in aims to meet both requirements at the same time. However, it is vulnerable to channel fading, and suffers from the noise aggravation due to the square operation. In this paper, we propose a dual-tone radio interferometric positioning system (DRIPS) using undersampling techniques, named uDRIPS. Our proposed methodology is immune to flat fading effects, and avoids the amplification of measurement noise by directly undersampling the received signal. Furthermore, the time-of-arrival (TOA) information is extracted from the phases of the received dual-tone signals in the uDRIPS. As a result, it is able to localize an asynchronous target with the help of synchronous anchors (nodes with known positions). Moreover, we investigate the integer ambiguity problem due to phase wrapping, and develop a localization algorithm to estimate the unknowns alternatively. Simulation results corroborate the efficiency of our proposed algorithm.
DOI: --
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