Method and system for determining position of a wireless electronic device within a volume

A system for locating a mobile electronic device within a volume, comprising:

• a plurality of acoustic transmitters arranged in a selected pattern within the volume;
• a first processor in signal communication with each of the plurality of acoustic transmitters, the first processor having instructions therein to drive each of the plurality of transmitters with a different coded driver signal, the different driver signals substantially decorrelated with each other;
• an electromagnetic signal transceiver in signal communication with the first processor, wherein the first processor has instructions therein to communicate a time reference signal to the mobile electronic device;
• the mobile electronic device including an acoustic receiver for detecting signals from the plurality of acoustic transmitters and an electromagnetic transceiver for receiving from the processor at least a time reference signal;
• wherein the mobile electronic device includes a second processor having instructions programmed therein for cross-correlating signals detected by the acoustic receiver with a replica of the signal of each of the different coded driver signals, the second processor including instructions programmed therein for calculating an acoustic travel time of acoustic signals between each transmitter and the acoustic receiver from the cross-correlated signals;
• and
• wherein at least one of the first processor and the second processor is programmed to determine the position of the mobile electronic device from the travel times.