A local positioning system is proposed for wirelessly locating an object using existing features within a static environment, such as walls, as the references for determining the position of the system. An antenna 16 attached to the object transmits RF signals which are reflected by the surroundings....http://www.google.fr/patents/US7400291?utm_source=gb-gplus-shareBrevet US7400291 - Local positioning system which operates based on reflected wireless signals
Local positioning system which operates based on reflected wireless signals
