Dual-tone radio interferometric positioning systems for multi-target localization using a single mobile anchor
Dual-tone radio interferometric positioning systems for multi-target localization using a single mobile anchor
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DOI：
10.1109/cc.2015.7084381
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发表时间：
2015-04
影响因子：
4.1
通讯作者：
Li Li'an;Wang Yiyin;Xiaoli Ma;Cailian Chen;Xinping Guan
中科院分区：
文献类型：
--
作者：
Li Li'an;Wang Yiyin;Xiaoli Ma;Cailian Chen;Xinping Guan
本文提出了一种低成本的单移动锚点双音无线电干涉定位系统，可同时定位多个目标。我们将其命名为mDRIPS。在mDRIPS中，每个目标连续发送具有专用频率的双音信号，移动锚在其轨迹上的不同位置接收信号。移动锚与目标之间不需要时间同步，目标之间也不需要时间同步。考虑到目标时钟的不稳定性，我们开发了一种esprit型算法来估计每个双音信号的频率。此外，从接收到的双音信号的相位估计中提取每个目标信号的到达时间（TOA）。在锚的轨迹上测量不同位置的多个toa后，可以对每个目标进行定位。由于每个双音信号的两个音调的频差被设计成小于信道相干带宽，因此可以消除这两个音调的相同衰落效应。此外，研究了相位包裹引起的整数模糊问题，提出了一种处理简化模糊问题的定位算法。数值结果表明了该方法的有效性。
In this paper, a low-cost dual-tone radio interferometric positioning system using a single mobile anchor is proposed to locate multiple targets at the same time. We name it mDRIPS. In mDRIPS, each target continuously transmits a dual-tone signal with its dedicated frequencies, and the mobile anchor receives the signals at different positions along its trajectory. Neither time synchronization between the mobile anchor and the targets nor time synchronization among the targets is required. We take the instability of targets clocks into consideration and develop an ESPRIT-type algorithm to estimate frequencies of each dual-tone signal. Furthermore, the time of arrival (TOA) of each target signal is extracted from the phase estimates of the received dual-tone signals. After measuring several TOAs at different locations along the anchor's trajectory, each target can be located. Since the frequency difference of the two tones of each dual-tone signal is designed to be smaller than the channel coherence bandwidth, the same fading effect on these two tones can be eliminated. Moreover, the integer ambiguity problem due to phase wrapping is investigated, and a localization algorithm to deal with a simplified ambiguity problem is proposed. Numerical results demonstrate the efficiency of the proposed mDRIPS.