Concept Design of Seamless Location Based Emergency Warning System with GNSS-Based Signals

Taking action for evacuation immediately is the most important and effective measure when tsunami attacks in the aftermath of a large earthquake. In this paper, a concept of delivering the least amount of emergency warning information and location based information possible is presented with a design of indoor/outdoor seamless positioning and emergency warning system that uses GNSS-based signals. This system includes an indoor positioning system equipped with a positioning method with GNSS-based signals and broadcasts a small volume of data including emergency warning information indoor and outdoor as well as the navigation message. A facility with large indoor space in coastal areas has GNSS antenna, receives and relays the emergency warning message from GNSS to transmitters of indoor positioning system via local area network. The system also has a function to provide indoor evacuation control information from building security room. The data communication speed of indoor signals compatible with GNSS is low as well as GNSS signals. Although the available data volume for emergency warning information is limited, we have confirmed the system is able to provide marginal information on an actual case of indoor positioning system, the indoor messaging system (IMES).