Inverse precision velocity update for monopulse calibration

Details Inverse precision velocity update for monopulse calibration Inverse precision velocity update for monopulse calibration

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.

REFERENCES:
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patent: 5334980 (1994-08-01), Decker
patent: 5489907 (1996-02-01), Zink et al.
patent: 5742250 (1998-04-01), Krikorian et al.
patent: 6741202 (2004-05-01), Krikorian et al.

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