Analysis of localization for drone-fleet

Generally in mobile devices, localization is a critical issue to provide various services. A common way to find location is to use GPS. However, GPS has several limitations such as its reliability. Especially in none line of sight (NLOS) situations such as indoor environment, GPS is unable to find location. This could be a serious issue for drone fleet because we may lose control of drones. In this paper, we present a comprehensive survey on effective solutions for complementing GPS for drone fleet. In particular, we introduce several localization techniques that are independent of GPS. Since each technique has its own advantage as well as disadvantage. Hence, we categorize these localization techniques in order to find which technique is suitable for drone fleet.