A Study of Adaptive-Weighting Locating Schemes over HeterogeneousWireless Networks

Abstract

In recent year, Global Positioning System (GPS) is general used for location service. It calculates the distance of satellite and GPS receiver with time difference. When a GPS receiver receives over three satellite signals, the triangulation meth is determining user’s position. However, there is a possibility that landform, shelter, and number of satellites could have an impact on the satellite signal. As wireless technology progressed, different user location and tracking systems were invented, such as the WiFi tracking system, which mainly uses received signal strength indication (RSSI) to set up radio maps that provide locations, and RF models to estimate the locations of a moving client; The ZigBee tracking system deployment reference nodes in the position environment, by transform signal strength to distance and refer reference node coordinate to determining blind node position with Minimum Mean Square Error method. This research proposes an adaptive-weighting locating mechanism within wireless heterogeneous networks, which enhances GPS’s ability to receive signals in buildings and precision in estimating locations.