Patent ID: 8433337
Filing Date: 2013-04-30
Classification: G01S,H04W

Abstract:
1. A method for received signal strength (RSS)-based direction-of-arrival (DOA) location estimation for one or more wireless target in an indoor environment, comprising: providing and deploying a DOA sensor node, the DOA sensor node comprising three antennas, antennas A, B, and C, forming a triangular antenna array, configured substantially in a center of a predetermined confined indoor space; fixing one or more wireless target to one or more localizing object; sending out a plurality of packet signals by the DOA sensor node to the wireless target, each packet comprising of a fixed sensor node cover range, and a combined packet signals covering entire confined indoor space; obtaining RSSI values for the respective RSSI states received from the wireless target by a plurality of beams at a plurality of incident angles θ and φ using the triangular antenna array, a Single-Pole-Double-Throw (1P2T) switch, and a vector signal deconstructor (VSD); collecting and comparing eight packet signals by the DOA sensor node to obtain a strongest packet signal having a maximum RSSI value; and calculating a location (θ, φ) of the localized object using a RSS-based DOA algorithm on the data obtained from the strongest packet signal having the maximum RSSI value, the RSS-based DOA algorithm comprising of performing the following steps: