Passive positioning method for combining RSSI and pattern matching

The invention discloses a passive positioning method for combining received signal strength indication (RSSI) and pattern matching, which mainly solves the problem that the conventional passive positioning method has low positioning precision due to the influence of multipath effect in a wireless sensor network. The method comprises the following steps of: (1) gridding network rules, detecting a channel by using single pulse signals, and calculating the fading characteristic value of the channel; (2) selecting 4 reference receivers according to the magnitude of average received signal intensity of each receiver and the relative position; (3) randomly selecting two receivers during positioning, calculating the average received signal intensity difference delta Pr of the two receivers and the fading characteristic differences delta Loss from the grids to the receivers; (4) matching the fading characteristic differences delta Loss of all grids and the opposite number -delta Pr of the average received signal intensity difference; and (5) repeating the steps (3) to (4) for three times, and taking the center of the grid with highest average matching degree as the positioning result. Themethod can still ensure high precision under the influence of the multipath effect, improves the precision of the conventional positioning method, and can be used for passive positioning of the wireless sensor network in an urban environment.