Patent ID: 7925251

Claim:
In a system that includes RF units that include at least one transmitter and at least one receiver, a method for determining real-time location of a reflecting object with the help of at least one operational signal transmitted via an operational link between certain RF units, the method comprising: (a) providing initial direct signals' time of arrival characterizing direct link between said certain RF units, and providing initial internal delays of said certain RF (b) transmitting direct signal via said direct link between said certain RF units, and measuring real-time direct signal's time of arrival characterizing said direct link; (c) the transmitter transmitting signals towards the object and the receiver receiving at least one signal reflected from the object, thus giving rise to the operational signal transmitted via the operational link; and measuring reflected signals' time of arrivals; (d) calculating real-time relative internal delay of said operational link, said calculating based on the measured real-time direct signals' time of arrivals, initial direct signals' time of arrivals and initial internal delays of said certain RF units; and (e) determining the real-time location of the object based on the reflected signals' time of arrivals and the real-time relative internal delay of the operational link, wherein said operational signal and said direct signal are constituted by different lobe components of a same signal transmitted between said certain RF units, and wherein determining real-time location of a reflecting object is provided with the help of a plurality of operational signals transmitted via a plurality of operational links between respective RF units, wherein real-time relative internal delays are calculated separately for each operational link among said plurality of operational links, said calculations providing based on real-time direct signals' time of arrival, initial direct signals' time of arrival and initial internal delays of RF units corresponding to each respective link.