Patent ID: 8907682

Claim:
A method of calibrating a measurement of electromagnetic (EM) signals, comprising: conducting an EM signal to a splitter via a dynamic transmission path having variation in at least one of a time response and a frequency response over time; separating at least one reference signal component from said EM signal using said splitter; delaying at least one of said EM signal and said at least one reference signal component; intercepting a reception that combines said EM signal after an interaction with a target object and said at least one reference signal component after at least one interaction with at least one reference element having at least one of a known time response and a known frequency response; extracting said EM signal after said interaction with said target object and said at least one reference signal component from said reception during different time slots; and compensating for said variation by calibrating a measurement of said interacted EM signal by a signal analysis of said extracted and interacted at least one reference signal component.