Analyses for Multistatic Geometric Image Correction.
Abstract
Polar format storage of two-dimensional monostatic synthetic aperture radar (SAR) data (gathered in the stretch-spotlight mode of operation) allows matched two-dimensional Fourier transform processing; it eliminates range walk, allowing maximum size field of view for a given resolution or finest resolution for a given size field of view. In a bistatic SAR system, iso-range and iso-Doppler contours are orthogonal only for zero bistatic angle. The range gradient diminishes as the bistatic angle is increased. When polar format storage is used, these effects result in increasing smearing (defocusing) and geometric distortion of the imagery as the bistatic angle is increased. Hence, such formatting is not matched to two-dimensional transform processing. A solution to the bistatic SAR image processing problem is provided by a new technique called coherent unskewing and reconstitution logic (Curl). The matched processing performance of the Curl technique is demonstrated using computer simulation of received data from a bistatic SAR system with two-dimensional geometry. The resulting imagery is sharply focused and is totally free of geometric distortion. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1980
- Accession Number
- ADA085866
Entities
People
- J. S. Prichard
- R. A. Baker
- W. J. Capiti
Organizations
- Eaton Corporation