Automatic motion compensation for residual motion in a synthetic

Details Automatic motion compensation for residual motion in a synthetic Automatic motion compensation for residual motion in a synthetic

1984-09-28

1986-10-14

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

342196, G01S 1390

Patent

active

046175679

ABSTRACT:
In a SAR system (10) a method is provided for compensating for antenna AN residual motion relative to a motion sensor INS, wherein such residual motion causes phase corruption in a radar image produced by the SAR system. Residual motion compensation is provided by first correlating a received radar signal to a range line having a plurality of azimuth positions. Such signal is transformed into a frequency spectrum indicating the reflectivity of point reflectors at the various azimuth positions. Then, the range line is sampled for symmetric triplets of three sequential point reflectors positioned along the range line at a distance from each other corresponding to a specified frequency associated to a mode of residual vibration of the antenna. The amplitude and phase angle of said mode of the antenna residual motion may be obtained from such symmetric triplet(s).

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