Wave orbital velocity, fade and SAR response to azimuth waves
Abstract
Orbital velocity bunching as an explanation of the response of SAR is proposed, and the restraint of the coherence time of the scattering centers is considered. Key results in random scene image theory as applied to the azimuth wave problem are summarized. Doppler shifts are shown to be a function of wave and sensor geometry. The first order consequence of orbital motion is shown to induce a redistributed scatterer density that may be considered independently from specific SAR performance parameters and the new density can be convolved with the SAR transfer function to derive the expected output image. Focus perturbation of azimuth wave imagery is observed to occur, but only for a specific subset of wave length and wave height circumstances. Scatterer fade is shown to be of central importance in the SAR transfer function.
- Publication:
-
Coherent and Incoherent Radar Scattering from Rough Surfaces and Vegetated Areas
- Pub Date:
- May 1981
- Bibcode:
- 1981cirs.rept...63R
- Keywords:
-
- Azimuth;
- Fading;
- Ocean Surface;
- Orbital Velocity;
- Radar Scattering;
- Synthetic Aperture Radar;
- Water Waves;
- Apertures;
- Coherent Scattering;
- Doppler Effect;
- Focusing;
- Incoherent Scattering;
- Radar Imagery;
- Communications and Radar