Motion compensation and geometric distortion in airborne SAR imagery
Abstract
The effects of across-track motions and a yawed antenna on the spatial and radiometric performance of an airborne SAR are described. Techniques for Doppler tracking and autofocussing, and the effects of applying these processing procedures to improve radiometric and spatial performance respectively are discussed. The problem of achieving simultaneous spatial and radiometric performance using such techniques was explored. Under the assumption that any defocussing that does occur is due to the path of the SAR platform deviating from a straight line, techniques for achieving simultaneous spatial and radiometric performance are advocated. Processing to the center frequency yielded by the Doppler tracker followed by resampling, to correct the geometry, using the autofocus measurements, appears to be the best approach.
- Publication:
-
Progress in Imaging Sensors
- Pub Date:
- November 1986
- Bibcode:
- 1986pis..symp..539B
- Keywords:
-
- Airborne Equipment;
- Geometric Accuracy;
- Image Motion Compensation;
- Radar Imagery;
- Radar Resolution;
- Radiometric Resolution;
- Spatial Resolution;
- Synthetic Aperture Radar;
- Attitude Stability;
- Doppler Radar;
- Radar Antennas;
- Radar Tracking;
- Self Focusing;
- Communications and Radar