Method and apparatus for determining position of a wireless device

A device capable of receiving/transmitting wireless signals in the form of range information from/to a reference station, the device comprising:

• receiver/transmission means for receiving/transmitting wireless signals from/to at least three reference stations;
• processing means capable of receiving the wireless signals and:
• determining a region or area surrounding each reference station, wherein the region surrounding one reference station intersects with at least one region surrounding at least one other reference station to form at least one intersecting space;
• defining the at least one intersecting space to delineate a device location search space;
• determining locations of the device within the receiver location search space;
• determining combinations of said receiver locations, and using a distribution analysis test to examine a skewness value of each combination;
• detecting and selecting the combinations of device positions that result in a minimum skewness value or a combination that provides skewness value less than a pre-defined minimum threshold value;
• and
• utilizing the detected and selected combinations to determine a refined final position of the device.