Mesh síť pro podporu kooperativní lokalizace

Abstract

The goal of the work was to create a custom wireless mesh network that provides mobile device localization as a service based on network access points. An introduction to wireless mesh networks and localization was made. Subsequently, suitable technologies were selected for implementation and a design of a mesh network with localization support and a configuration application for Android mobile devices was created. The creation of a custom wireless ad-hoc mesh network consisting of ESP32 wireless modules from Espressif was achieved. The mesh network is based on WiFi technology and the routing in this network is handled using the ESP-WIFI-MESH protocol. The localization component is based on Bluetooth technology, specifically on the signal strength value (RSSI), which is measured by the mesh network modules on the mobile device. A Kálmán filter was applied to the measured RSSI values to help reduce the bias in the location determination. The test results showed that the custom implementation of the mesh network with localization support is more accurate than GNSS in indoor applications. On the other hand, GNSS shows higher accuracy in the exterior.