Method and system for determining area in which attenuation object is located

A method for determining an area in which an attenuation object is located in a space, wherein the space is divided to finite elements, the method comprising:

• providing a first transmitter to transmit radio signal with a first strength value, wherein the first transmitter is at a first location;
• moving a measurement device along a first path and measuring a plurality of real signal strength values at interest-locations along the first path, wherein the plurality of real signal strength values are measured using the first strength value at the interest-locations;
• calculating a theoretical signal strength value, for each of the interest-locations of the first path, using a radio signal propagation model assuming a free propagation between the first location and the interest-locations;
• setting an attenuation value for each of the finite elements, along lines connecting the first location and the interest-locations, to value of
• a free space attenuation value when a difference between the theoretical signal strength value and a real signal strength value corresponding to each of the finite elements is within a predetermined tolerance, and
• a non-free space attenuation value when the difference between the theoretical signal strength value and the real signal strength value is outside the predetermined tolerance, wherein the non-free space attenuation value is the free space attenuation value added with the difference between the theoretical signal strength value and the real signal strength value corresponding to each of the finite elements;
• and
• using locations of the finite elements with the non-free space attenuation value to determine the area in which the attenuation object is located.