Patent ID: 7417584
Filing Date: 2008-08-26
Classification: G01S

Abstract:
1. A method for determining the elevation of a target, comprising the steps of: transmitting electromagnetic energy toward the target; directing first and second antenna beams toward said target for reception of reflections of said electromagnetic energy, said first and second beams being angularly spaced in the vertical plane to produce a lower beam and an upper beam, said angular spacing in the vertical plane being about one-third of a 3 dB beamwidth of one of said upper and lower beams; forming an upper monopulse estimate of the elevation angle of said target from said upper beam; forming a lower monopulse estimate of the elevation angle of said target from said lower beam; multiplying said upper monopulse estimate by a first predetermined constant to form a first corrected estimate of the elevation of said target; multiplying said lower monopulse estimate by a second predetermined constant to form a second corrected estimate of the elevation of said target; and adding together said first and second corrected estimates to form a further estimate of the elevation of said target.