Patent ID: 8004453
Filing Date: 2011-08-23
Classification: F41G,G01S

Abstract:
1. An elevation null command generator for generating an error signal to servo position the elevation monopulse null plane of an elevated radar antenna at an elevation angle such that said plane intersects a reflecting ground surface at a predetermined command range along a straight line from said antenna to a point of intersection of said elevation null plane with said reflecting ground surface, said generator comprising means for processing the sum and elevation difference channels of a monopulse radar receiver, said processing means including: a central range gate, said central gate being centered at said command range; a plurality of pairs of range gates, the two gates of each pair being time spaced before and after said center command range of said central range gate; and means for cross multiplying the output of the range gates to eliminate the bias effects of strong targets adjacent to the monopulse null plane and ground surface intersection.