A METHOD OF GENERATING ACCURATE ESTIMATES OF AZIMUTH AND ELEVATION ANGLES OF A TARGET FOR A PHASED-PHASED ARRAY ROTATING RADAR

摘要

A method and apparatus for generating accurate estimates of a radar target's azimuth and elevation angles for a phased-phased array rotating radar. Scan modulated coherently integrated (SMCI) monopulse curves are generated from a measured one-way transmit antenna pattern and three receive antenna patterns. The SMCI monopulse curves are calculated in advance for the expected beam steers. To utilize the SMCI monopulse curves, two-way Sum, Delta-Azimuth and Delta-Elevation target returns are coherently integrated, the target's monopulse ratios calculated, and the SMCI monopulse curves or polynomials used to calculate the target's U-offset and V-offset sine-space angles, which are added to the radar's beam steer to get an improved estimate of the target's sine-space angular position denoted as USUBtgt /SUBand VSUBtgt/SUB. A coordinate system transformation transforms USUBtgt /SUBand VSUBtgt /SUBto azimuth and elevation angles in a non-rotating coordinate system.