A source localising method comprises the steps of measuring the power received by a set of sensors and selecting N measurements from respective sensors, where N is an even number and at least four. N1 different direct power ratios are constructed each derived from the N power measurements, with different...http://www.google.fr/patents/US6765533?utm_source=gb-gplus-shareBrevet US6765533 - Localization of a signal emitting source