Development of a locationing procedure for compact optical fiber embedding machine under urban noise environment

光纤网络正在迅速普及，但端部的建设一直是一个瓶颈。水平井钻井技术因其成本低、速度快而备受关注。在使用该技术时，需要对钻头进行定位和控制。然而，人为噪音阻碍了这项技术在城市地区的商业应用。利用人工噪声的特性，提出了一种在低比特率下具有高效率的通信方案：首先，我们发现人工噪声往往具有离散的线谱，其分布随时间和地点而变化。在本文中，我们提出了一种单向的通信方案，它使用OFDM和选择性地使用低噪声信道。在这里，我们定义的功率比，使相同的比特错误率的简单的OFDM和建议的计划作为增益。在这个方案中，我们必须从地下单向传输所有数据。因此，我们需要同时发送信道选择信息。 ...更多信息 通过选择低噪声信道，与不选择信道的方案相比，获得了较高的增益。采用幅度调制的方法，获得了3-8dB的增益。其次，我们提出了一种相位调制的方案。在这个方案中，我们处理两种信息数据集。一个是信道选择信息，另一个是纠错信息。这些信息彼此具有不同的错误率。然后，我们应用UQPSK（不平衡QPSK），其中代表这两种数据的符号是不对称的位置，并获得了11.5dB的最大增益。然后，对UQPSK的参数进行了优化，证明了该方案可以获得最高的增益;最后，采用了一种利用信道选择后信号相关性的同步方案，证明了该方案可以实现精确的同步。此外，我们证实了所提出的UQPSK方案的稳定性，对噪声的类型，通过模拟使用伪人工噪声。少

Optical fiber networks are rapidly spreading, but the construction of the end parts has been a bottleneck. The horizontal drilling technique gathers attention because of its low-cost and speed. In using this technique, we need to locate and control the drilling head. However, artificial noise has prevented the commercial use of this technique in urban areas. We propose a communication scheme which has a high efficiency in low bit rate by making use of characteristics of the artificial noise.Firstly, we found that the artificial noise often has discrete line spectra, and its distribution changes with places and times. In this paper, we propose a one-way communication scheme which uses the OFDM and selectively uses low-noise channels. Here we define the ratio of power which gives the same bit-error-rate to the simple OFDM and proposed schemes as gain. In this scheme, we must communicate all data in one-way from undergrond. We thus need to send the channel selection information at the sam … More e time.We obtain a high gain by selecting low noise channels compared a scheme without channel selection. We obtain a gain of 3-8dB by using amplitude modulation.Secondly, we propose a scheme with phase modulation. In this scheme, we deal with two kinds of information data sets. One is the channel selection information, and the other is the error correction information. These information have different error rates with each other. Then we apply the UQPSK(Unbalanced QPSK), in which the symbols representing these two kinds of data are located asymmetrically, and obtained the maximum gain of 11.5dB. Next, we optimized the parameters of UQPSK, and showed that we can obtain the highest gain with this scheme.Finally, we applied a synchronization scheme which makes use of correlation of signals after channel selection, and showed that we can achieve an accurate synchronization. Moreover, we confirmed the stability of the proposed UQPSK scheme against the types of noise by simulations using pseudo-artificial noise. Less