Patent ID: 6297762
Filing Date: 2001-10-02
Classification: G01S

Abstract:
Apparatus for use in an aircraft to process signals from a radar and then to transmit a pair of equal amplitude, antiphase jamming signals toward such radar, such apparatus comprising:(a) a pair of antenna assemblies, disposed at different locations on the aircraft, for receiving signals from the radar and for transmitting jamming signals;(b) first means, initially responsive to received signals from the pair of antenna assemblies, for measuring the phase of one of such received signals relative to the other to provide a first set of control signals indicative of the difference in phase between the received signals;(c) second means, responsive to the first set of control signals and to a portion of one of the received signals, for shifting the phase of such portion into phase coincidence with the other one of the received signals and to change the first set of control signals to indicate such coincidence; and(d) third means, responsive to the first set of control signals when such signals indicate phase coincidence between the portion of one of the received signals and the other one of such signals, for applying equal amplitude antiphase jamming signals to the pair of antenna assemblies.