Patent ID: 6661366
Filing Date: 2003-12-09
Classification: G01S,H01Q

Abstract:
A method for detecting a radar target of interest in the presence of multiple radar jamming interference sources, said method comprising the steps of:forming a plurality of sub-arrays from an antenna array; digitally beamforming sub-array data from the plurality of sub-arrays and generating quadrant sub-array beams, each with a respective sub-array beam pattern for each of said plurality of sub-arrays, and each quadrant sub-array beam having nulls at identical null positions, said sub-array beams formed having a constraint of maintaining a given boresight gain of each said quadrant sub-array beam; steering the nulls associated with the quadrant sub-array beams in directions associated with the sources of interference; determining sum and difference beams from said plurality of sub-array beams for detecting said target of interest; determining a monopulse ratio based on the sum and difference beams; and estimating an angle of arrival of the target using the monopulse ratio.