a method of detecting a target in a room using a radar system having a transmitter for irradiating the object , a sensor for receiving reflected radiation , and circuitry for analyzing the reflected radiation to determine at least one characteristic thereof , the method including determining at least one parameter for each wall of a plurality of walls of a room containing the target ; determining possible signal paths between the target and the sensor for paths including up to n reflections based on the at least one parameter of each wall and the location of the sensor ; calculating target image locations based on the possible signal paths ; and processing the received radiation to determine a target location based on target image locations .