Communications: directive radio wave systems and devices (e.g. – Determining direction – Monopulse
Reexamination Certificate
2005-02-08
2005-02-08
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining direction
Monopulse
C342S02500R, C342S02500R, C342S02500R, C342S073000, C342S074000, C342S075000, C342S080000, C342S165000, C342S173000, C342S175000, C342S176000, C342S179000, C342S190000, C342S191000, C342S195000
Reexamination Certificate
active
06853330
ABSTRACT:
A radar system derives a correction for an actual boresight (311) of a radar monopulse antenna mounted on a moving platform from Σ data and Δ data generated with respect to an a priori known, calibrated boresight (309). The monopulse antenna (602) is coupled to a ground position measuring system (616) while acquiring data. The radar receiver acquires a Σ and Δ synthetic aperture map of the same radar scattering location with respect to the calibrated boresight. Σ SAR data and the Δ SAR data are motion compensated using the position and velocity supplied by the ground positioning system. A computer forms a ratio of the aligned Δ pixels to the aligned Σ pixels for each of a plurality of aligned Σ pixels located near the calibrated boresight. The correction for the location of the actual boresight of the monopulse antenna is computed by an analysis of the ratio of aligned Σ pixels and corresponding aligned Δ pixels over the radar scattering location. Typically, a least square fit analysis is used to plot the Δ/Σ ratio, and ascertain where the zero crossing of the monopulse angle=0 line is found thereby identifying the position of the actual boresight, and the correction from the a priori, calibrated boresight.
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Krikorian Kapriel V.
Rosen Robert A.
Alkov Leonard A.
Gregory Bernarr E.
Raytheon Company
Vick Karl A.
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