Quasi-optical 3D localization using asymmetric signatures above 100 GHz
Quasi-optical 3D localization using asymmetric signatures above 100 GHz
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DOI：
10.1145/3495243.3517022
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Atsu Kludze;R. Shrestha;Chowdhury Miftah;E. Knightly;D. Mittleman;Yasaman Ghasempour
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文献类型：
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作者：
Atsu Kludze;R. Shrestha;Chowdhury Miftah;E. Knightly;D. Mittleman;Yasaman Ghasempour
由于可用的频谱范围很大，100 GHz以上的频谱有可能实现精确的3D无线定位。然而，现有的宽带定位系统使用需要严格时间同步的到达时间测量。本文介绍了一种用于100 GHz以上单次双极化三维定位的新型非相干系统123-LOC。我们的关键思想是在3D中创建独特的非对称太赫兹指纹，以便无线节点可以通过从测量的功率谱轮廓中获取线索来联合推断其角度位置和距离。我们介绍了一种双极化双缝波导结构，它将输出信号发射到自由空间，其关键特征是波束方向图取决于信号的频率和狭缝的几何形状。为了区分来自两个狭缝的发射，我们使用了偏振分集，并操纵了两个狭缝的孔径几何形状，使它们传输的角度光谱特征略有不同。我们的空中实验表明，仅通过非相干功率测量，123-LOC的平均角度估计误差为1°，测距分辨率为毫米级。
The spectrum above 100 GHz has the potential to enable accurate 3D wireless localization due to the large swath of available spectrum. Yet, existing wide-band localization systems utilize the time of arrival measurements requiring strict time synchronization. In this paper, we present 123-LOC, a novel non-coherent system for one-shot dual-polarized 3D localization above 100 GHz. Our key idea is to create unique asymmetric THz fingerprints in 3D so that a wireless node can jointly infer its angular position and distance by taking hints from the measured power-spectrum profile. We introduce a dual-polarized dual-slit waveguide structure that emits out signals into free-space with a key feature that the beam pattern depends on the frequency of the signal and the geometry of the slit. To distinguish the emissions from the two slits, we use polarization diversity and manipulate the aperture geometry of the two slits so that they transmit slightly different angular-spectral signatures. Our over-the-air experiments demonstrate that 123-LOC achieves an average angle estimation error of 1° together with millimeter-scale ranging resolution, solely through non-coherent power measurements.