Directional Wi-Fi (Wireless Fidelity)-based wireless positioning system and method

The invention provides a directional Wi-Fi (Wireless Fidelity)-based positioning system. Two Wi-Fi APs (Access Points) with rotary directional antennas are placed at the two sides of a positioning area to be used for transmitting wireless signals; a client is moved in the positioning area, simultaneously receives the wireless signals from each directional AP, and supplies the data related to the signals to a calculating device; and the calculating device analyzes and processes the data so as to calculate the position of the client and return the position information to the client, thereby positioning and tracking the client in real time. The system can be arranged on the site at any time and any place without construction on the site or in a room in advance. Moreover, large-scale preliminary data acquisition works are avoided, and the instant requirements in emergency occasions are met.