Patent ID: 8255341

Claim:
A method for characterizing a computer system parameter by analyzing a target electromagnetic signal radiating from the computer system, the method comprising: monitoring the target electromagnetic signal using a first directional antenna located outside of the computer system, wherein the first directional antenna is directed at a location inside the computer system; monitoring the target electromagnetic signal using a second directional antenna located outside of the computer system, wherein a receiving axis of the second antenna is oriented non-parallel to a receiving axis of the first antenna, and wherein the second directional antenna is directed at the location inside the computer system; characterizing the computer system parameter based on the target electromagnetic signal received from the first antenna and the target electromagnetic signal received from the second antenna, wherein characterizing the computer system parameter comprises: generating a predetermined number of first directional antenna signals based on the target electromagnetic signal monitored using the first directional antenna; and generating a predetermined number of second directional antenna signals based on the target electromagnetic signal monitored using the second directional antenna; and generating a request for an action based on the characterization of the computer system.