Abstract
WiFi positioning is the most promising means of indoor positioning in the future. However, most WiFi localization techniques can’t meet the requirements of the criminal investigation. Therefore, there is a need to make a research on the passive location. This paper mainly researched the passive location of WiFi client based on the location fingerprint. Based on the signal attenuation model, fingerprint location algorithm and promiscuous mode, an improved technique of passive positioning is introduced. First, we conducted an in-depth research for the position of the fingerprint algorithm based on RSSI (Received Signal Strength Indication). Then, we propose solutions to optimize the location fingerprint to reduce location time and calculation process. Finally, simulation results and field test data show that symbolic positioning is good and physical positioning can reach high position accuracy.
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