Discrete autofocus for ultra-high resolution synthetic aperture radar
US5043734A · kind A · utility
55Cited by
8References
8Claims
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Assignee
Inventor
Key dates
| Filing date | Dec 22, 1988 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Dec 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/9019
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.