Discrete autofocus for ultra-high resolution synthetic aperture

Details Discrete autofocus for ultra-high resolution synthetic aperture Discrete autofocus for ultra-high resolution synthetic aperture

1988-12-22

1991-08-27

Tarcza, Thomas H.

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

Synthetic aperture radar

342162, 342195, 342196, 342197, G01S 1389

Patent

active

050437348

ABSTRACT:
The invention provides improved focus by phase corrections for Synthetic Aperture Radar images by operation on the range bin containing a selected isolated target. A phase correction signal is generated by first obtaining a non-interfering radar return from the selected target through band pass filtering operation and then extracting a non-linear residual phase from the band pass filtered data with an arc-tangent generator. The residual phase derived by the arc-tangent generator is then applied to the range compressed SAR data as a phase correction signal.

REFERENCES:
patent: 4219811 (1980-08-01), Herman et al.
patent: 4471357 (1984-09-01), Wu et al.
patent: 4706088 (1987-11-01), Weindling
patent: 4706089 (1987-11-01), Weindling
patent: 4724418 (1988-02-01), Weindling
patent: 4771287 (1988-09-01), Mims
patent: 4801939 (1989-01-01), Jones
patent: 4866448 (1989-09-01), Rocca et al.

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