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About this sample
About this sample
Words: 646 |
Page: 1|
4 min read
Published: Sep 19, 2019
Words: 646|Page: 1|4 min read
Published: Sep 19, 2019
Since IEEE wireless protocol was released about ten years ago, Wi-Fi technical standards have been well developed and widely used due to the high speed, wireless connectivity and large coverage of the Wi-Fi technology. Nowadays the demand for real-time location information of mobile users is unprecedented. For outdoor environments, using GPS can achieve high accuracy positioning results.
However, in indoor environments, due to the attenuation or obstruction of GPS signals, GPS technology cannot be used effectively. Therefore, Wi-Fi based positioning technology has been researched and developed for indoor environments.In this thesis, the huge market potential and rapid development of smartphones technologies were briefly assessed. It is concluded that the integration of the smartphones and Wi-Fi for indoor positioning is a mainstream direction in research and industry commercialization. The main challenges for indoor environment are discussed with the conclusion that the fingerprint technique based on RSS is the optimal solution and the smartphones is the most suitable mobile device due to its wide usage. Commonly used estimation methods and algorithms of fingerprint technique are reviewed.We successfully implemented a Wi-Fi based indoor positioning system using a smartphone and the fingerprint-based positioning method.
A number of case studies were designed and field experiments were conducted using various mobile platforms (i.e. smartphone, iPad and laptop) and the development and requirements of hardware and software systems were described.The statistical result of the positioning errors(the maximum and minimum errors were 4.79 m and 0.58 m respectively) in the specific indoor environment. This is compared against our testing system results of 2 m, which is, more precisely, the spatial resolution of the best matching algorithm. The performances of both systems were affected by the quality of the RSS observations collected from a smartphone. The current smartphones have limitations on the quality of Wi-Fi adapters. It is expected that better quality and proper sized Wi-Fi adapters will be available in smartphones in future. The spatial resolution of the proposed indoor positioning system can be further improved by setting up more complex indoor environment, and increasing the number of APs or combining other types of sensors into the smartphone.
Several aspects can be further explored to enhance the performance of the proposed Wi-Fi based positioning system for future work. Three main aspects are listed as follows:
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