Patent ID: 6853330

Claim:
A method for estimating an actual boresight of a radar monopulse antenna mounted on a moving platform from Σ data and Δ data generated with respect to a calibrated boresight of said monopulse antenna, said Σ data generated from a Σ channel, said Δ data generated from a Δ channel, said monopulse antenna coupled to a ground position measuring system, said ground positioning measuring system reporting a position of said monopulse antenna with respect to a reference and a velocity with respect to said reference, said method comprising the steps of: acquiring a Σ synthetic aperture map of a radar scattering location, using said Σ channel of said monopulse antenna with respect to said calibrated boresight, said radar scattering location centered about said calibrated boresight, said Σ synthetic aperture map formed from Σ data; acquiring a Δ synthetic aperture map of said radar scattering location using said Δ channel of said monopulse antenna with respect to said calibrated boresight, said Δ synthetic aperture map formed from a data; is motion compensating said Σ data with respect to said reference using said position and said velocity to obtain aligned Σ pixels; motion compensating said Δ data with respect to said reference using said position and said velocity to obtain aligned Δ pixels, each of said aligned Δ pixels matched to corresponding said aligned Σ pixels obtained from said radar scattering location; forming a ratio of said aligned Δ pixels to said aligned Σ pixels for each of a plurality of said aligned Σ pixels located near said calibrated boresight; identifying the location of said actual boresight of said monopulse antenna by an analysis of said ratio for a plurality of said aligned Σ pixels and corresponding said aligned Δ pixels over said radar scattering location.