可见光室内定位技术研究

发布时间：2018-01-02 21:36

本文关键词：可见光室内定位技术研究　出处：《北京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,基于全球定位系统(GPS)的室外定位的技术已经相当成熟,基于此技术的应用程序的成功发展刺激了室内定位技术的开发和研究。然而,在室内无法利用GPS技术实现室内定位,原因在于GPS系统接收的卫星信号非常微弱甚至无法接收。因此,需要一种可以不依赖GPS卫星信号的新技术来实现室内定位。在现有室内定位技术精度较低、无线资源消耗严重、系统实施复杂的背景下,以实验室的项目为支撑,本文对基于可见光通信的室内定位技术开展了研究,主要有以下三个研究重点：一、结合实际应用情况对室内可见光信道进行了建模。二、基于此模型并结合光电传感器的物理特性,对现有的多种定位算法进行了仿真。在通过对比和研究之后,改进了现有的定位算法。三、设计了可见光室内定位平台。第一个研究重点,在传统朗伯模型的理论基础上建立了新的可见光通信信道模型,现有的信道模型是基于理想环境建立的,即发送端所在平面与接收端平面平行且相对距离一定的情况。本文针对接收端竖向变位和倾斜的情况建立了新的信道模型,更加符合实际情况。第二个研究重点,对现有ID定位算法进行了改进。传统的ID定位算法虽然抗干扰性较高,但是精度较差。本文在传统ID定位算法的基础上,对发送端LED的光照强度进行了加权平均,提高了定位精度。由于利用了多个LED的相对强度,在接收端发生微小变化或收到干扰时仍然能够保持较高的定位精度。第三个研究重点,设计了可见光室内定位平台,其中包括了收发端的硬件、多光源时分复用的接入方式和通信协议。通过仿真验证,各模块工作良好,为可见光室内定位系统的实施奠定了基础。
[Abstract]:At present, the outdoor positioning technology based on GPS (Global Positioning system) has been quite mature. The successful development of application program based on this technology has stimulated the development and research of indoor positioning technology. GPS technology can not be used in indoor positioning because the satellite signal received by the GPS system is very weak or even unable to receive. A new technique that can be independent of GPS satellite signals is needed for indoor positioning. Under the background of low precision of indoor positioning technology, serious consumption of wireless resources and complex implementation of the system, the indoor positioning technology based on visible light communication is studied in this paper. There are three main research points as follows: first, the indoor visible light channel is modeled in combination with the actual application. Secondly, based on this model and combined with the physical characteristics of the photoelectric sensor. After comparison and research, the existing localization algorithms are improved. Thirdly, the visible light indoor positioning platform is designed. The first research focus is to establish a new visible light communication channel model based on the theory of the traditional Lambert model. The existing channel model is based on the ideal environment. In this paper, a new channel model is established for the vertical displacement and tilt of the receiver, which is more in line with the actual situation. The second research focus is to improve the existing ID location algorithm. Although the traditional ID location algorithm has high anti-interference, but the accuracy is poor. This paper is based on the traditional ID location algorithm. The illumination intensity of LED is weighted and the positioning accuracy is improved. The relative intensity of multiple LED is utilized. High positioning accuracy can be maintained when the receiver changes slightly or receives interference. The third research focus is to design the visible light indoor positioning platform, which includes the hardware of the transceiver, the access mode of multi-light time division multiplexing and the communication protocol. The simulation results show that the modules work well. It lays a foundation for the implementation of visible-light indoor positioning system.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.1

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