Patent ID: 8700056
Filing Date: 2014-04-15
Classification: G01S,H04W

Abstract:
1. A real-time location method in a wireless network comprising at least one pair of fixed wireless devices placed in known positions and at least one mobile wireless device, said method comprising: a) measuring the RSSI (Received Signal Strength Indication) value relative to the transmitted signal between said at least one mobile wireless device and each of the fixed wireless devices of said pair of fixed wireless devices; b) determining the distances between said at least one mobile wireless device and each of the fixed wireless devices of said pair of fixed wireless devices based on a model that describes the relation of the RSSI value relative to the transmitted signal between said at least one mobile wireless device and each of the fixed wireless devices of said pair of fixed wireless devices as a function of the distance, wherein said model depends upon at least one characteristic parameter of the transmission channel; c) estimating the position of said at least one mobile wireless device based on said distances determined in said step b); d) periodically and automatically determining said characteristic parameter of the transmission channel, based on the known fixed mutual distances (d ij ) between the fixed wireless devices of said pair of fixed wireless devices.