The smartphone service sends out pulses to map out obstacles around the room and relays information on distances and directions as audio instructions.
Several base stations must be set up around the room with a host computer connected to them, transmitting the information they pick up to the user's mobile device by Bluetooth.
A mapping application designed for Android platforms guides the user to their destination by translating the data into audio instructions, Reg Hardware reports.
UWB technology is said to be more accurate that GPS, and will work inside a room that satellite signals are unable to penetrate. Its margin of error has been calculated at 0.3 metres.
Fujitsu is working on the project with Japan's National Institute of Information and Communications Technology, which is hoping to develop the system further, so it can work beyond the confines of a single space.
The technology will be showcased at the Wireless Technology Park 2012 in Pacifico Yokohama, Japan, from July 6 to July 7.