Development of Indoor/Outdoor Seamless Positioning Prototype System Fusing GPS and Wi-Fi
According to the application requirements of seamless positioning and the key technical problems need to be solved,a comparative study of multi-positioning technologies fusion solutions is presented firstly.As revealed by this benchmark,a combination of GPS and WLAN is shown to provide more excellent comprehensive performance.Next,to provide a continuous positioning service,we design a strategy to switch automatically between indoor / outdoor positioning technologies and methods.To eliminate the fluctuation that appeared in the process of switching and improve the reliability,alpha-count method is introduced.Finally,we develop an indoor / outdoor seamless positioning prototype system,UL mobile,fusing GPS and Wi-Fi.Experiments show that UL mobile can preliminarily meet the needs of indoor / outdoor seamless positioning application.