Correlation match filter for passive signal detection

A passive target detector employing a correlation match filter comprising:

• beam forming means for forming two passive phase offset beams and dynamically sweeping said beats across a target to generate first and second phase offset received signals;
• complex correlation means connected to said beam forming means for generating a complex cross-correlation coefficient of said first and second phase offset signals, said coefficient having real and imaginary parts;
• replica function generating means for generating a replica signal in the form of complementary functions of a relative angle between a sensor line-of-sight and a source of signal to be detected;
• four quadrant multiplier means for multiplying said real and imaginary parts of said coefficient by said complementary functions to generate a plurality of partial products;
• summing and integrating means for accumulating over time the partial products from said four quadrant multiplier means to provide real and imaginary filter outputs;
• and
• output means connected to said summing and integrating means for generating a detection output if a target has been detected.