基于单倾斜接收机的三维可见光室内定位系统

发布时间：2018-05-06 06:17

本文选题：可见光定位 + 可倾斜光接收机　；参考：《南京邮电大学》2017年硕士论文

【摘要】：最近,可见光通信作为一种新兴的无线通信技术,与其他无线通信技术相比,具有节能、无电磁干扰和传输速率高等特点。以LED作为光源的可见光通信系统在照明的同时能够进行数据传输,实现照明通信一体化。如今,全球定位系统已经成熟,在室外定位中能够实现较高的定位精度,但在复杂的室内环境却无法利用全球定位系统进行室内定位。因此,可见光定位已逐渐成为室内环境的研究热点。本文基于单个发射端和单个倾斜光接收机,提出了一种三维(3-D)室内可见光定位系统。倾斜的光接收器位于可旋转和可升降的平台上.通过提升光接收器的平台,可以将3D空间被划分为许多二维(2-D)平面。在每个2-D平面中,可以通过旋转接收器平台来获得各种方位角,这提供了以不同方位角执行多个测量以实现角度增益的可行方式,根据角度增益的差异,提出了一种3-D定位算法。实验结果表明,提出的定位算法可以提供良好的定位精度。基于该三维定位系统,论文的研究重点主要包括以下几个方面:(1)在研究了常见的室内可见光定位技术原理的基础上,综合可见光通信系统的相关背景知识,本文创新性的提出了基于单倾斜接收机的三维可见光定位系统。在系统中,将设计的光接收模块与光学斜面和旋转平台以及升降支架组合后制成一个可倾斜可旋转的接收机。它为定位系统中反复多次的精确的方位角度测量提供了有效保障,减小了因角度测量所引起的误差。(2)构建了基于单倾斜接收机的三维可见光室内定位演示系统,在该演示系统中通过升降接收机支架,进行了三维空间内的定位实验,在600mm*600mm*1135mm的实验环境中实际位置与估计位置之间的平均定位误差小于35mm。实验结果表明基于单倾斜接收机的三维可见光室内定位系统具有较高的定位精度,为可见光室内定位提供了一种新的解决方案。(3)为了提高系统性能和定位精确度,研究了接收机倾斜角对于系统性能的影响,基于信道容量的导出表达式,提出一个通过倾斜接收机平面来提高系统性能的最优化问题,并且通过专门的求解工具求解该优化问题,最终通过对倾斜角?等变量的仿真,得到在系统发射光功率一定,LED光源的半功率角适当时,增加接收机的倾斜角,可以提高基于单倾斜接收机的可见光室内定位系统的系统性能,从而进一步提高系统定位的准确性。
[Abstract]:Recently, as a new wireless communication technology, visible light communication has the advantages of energy saving, no electromagnetic interference and high transmission rate compared with other wireless communication technologies. The visible light communication system with LED as the light source can transmit data while illuminating and realize the integration of lighting communication. Nowadays, the global positioning system (GPS) is mature and can achieve high positioning accuracy in outdoor positioning, but it can not be used in indoor positioning in complex indoor environment. Therefore, visible light location has gradually become a hot spot in indoor environment. Based on a single transmitter and a single tilted light receiver, this paper presents a three dimensional (3D) indoor visible light positioning system. The tilted light receiver is located on a rotatable and liftable platform. By lifting the platform of the optical receiver, 3D space can be divided into two-dimensional 2-D planes. In each 2-D plane, various azimuths can be obtained by rotating the receiver platform, which provides a viable way to perform multiple measurements at different azimuths to achieve angular gain, depending on the angular gain. A 3-D location algorithm is proposed. Experimental results show that the proposed localization algorithm can provide good positioning accuracy. Based on the 3D positioning system, this paper mainly includes the following aspects: 1) on the basis of the research of common indoor visible light positioning technology, the paper synthesizes the background knowledge of visible light communication system. In this paper, a three-dimensional visible light location system based on a single tilt receiver is proposed. In the system, a tiltable and rotatable receiver is made by combining the designed optical receiving module with the optical sloping plane, the rotating platform and the lifting support. It provides an effective guarantee for repeated and accurate azimuth angle measurement in the positioning system, and reduces the error caused by angle measurement. A 3D visible-light indoor positioning demonstration system based on a single-tilted receiver is constructed. In this demonstration system, the positioning experiment in three-dimensional space is carried out by lifting receiver bracket. The average positioning error between the actual position and the estimated position in the 600mm*600mm*1135mm experimental environment is less than 35mm. The experimental results show that the 3D visible-light indoor positioning system based on single-tilted receiver has high positioning accuracy and provides a new solution for visible-light indoor positioning. In this paper, the influence of receiver tilt angle on system performance is studied. Based on the derived expression of channel capacity, an optimization problem is proposed to improve the system performance by tilting the receiver plane. And through a special solution tool to solve the optimization problem, finally through the diagonal angle? When the half-power angle of LED light source is appropriate, the system performance of the visible light indoor positioning system based on single-tilted receiver can be improved by increasing the inclination angle of the receiver. Thus, the accuracy of system positioning is further improved.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

【参考文献】