Patent ID: 6486823
Filing Date: 2002-11-26
Classification: G01S,H04B,H04K

Abstract:
An adaptive cross polarization electronic countermeasures system for jamming an incoming radio frequency signal from a monopulse tracking radar comprising:a receive antenna having a vertical feed and a horizontal feed, said receive antenna receiving said incoming radio frequency signal from said monopulse tracking radar, said receive antenna separating said incoming radio frequency signal into a vertical receive component and a horizontal receive component; said vertical feed of said receive antenna providing a first electrical signal representative of the vertical receive component of said incoming radio frequency signal; said horizontal feed of said receive antenna providing a second electrical signal representative of the horizontal receive component of said incoming radio frequency signal; phase shifting means for shifting the phase of said first electrical signal by a predetermined phase shift to provide a phase shifted first electrical signal; amplifying means for amplifying said phase shifted first electrical signal and said second electrical signal; a transmit antenna having a vertical feed and a horizontal feed; timing signal generating means for generating a plurality of timing signals; switching means, responsive to said plurality of timing signals, alternately providing at a predetermined frequency a first electrical signal path from the vertical feed of said receive antenna to the horizontal feed of said transmit antenna and a second electrical signal path from the horizontal feed of said receive antenna to the vertical feed of said transmit antenna, said phase shifted first electrical signal being transmitted along said first electrical path to the horizontal feed of said transmit antenna, the horizontal feed of said transmit antenna converting said phase shifted first electrical signal to a phase shifted vertical transmit component radio frequency signal; said second electrical signal being transmitted along said second electrical path to the vertical feed of said transmit antenna, the vertical feed of said transmit antenna converting said second electrical signal to a horizontal transmit component radio frequency signal; said transmit antenna alternately transmitting to said monopulse tracking radar said phase shifted vertical transmit component radio frequency signal and said horizontal transmit component radio frequency signal at said predetermined frequency.