A method to determine a location of a communications device may include measuring a time of arrival for each pulse received at a receiver. The method may also include generating a set of possible hypothetical matches between each received pulse and a transmission path between a transmitter and the receiver,...http://www.google.com.hk/patents/US7783301?utm_source=gb-gplus-share專利 US7783301 - Method and device for determining a location of a communications device
