Computer simulation of quantisation effects on ERS-1 wave-mode spectra
Abstract
Two quantisation schemes, 2-bit and 4-bit, have been proposed for the analogue-to-digital conversion of the Synthetic Aperture Radar (SAR) video signal in the ERS-1 wave mode. This paper analyses the effects of these two quantisation schemes on the wave spectra through simulation. The ocean-wave radar model was developed in cooperation with the Max-Planck-Institut fuer Meteorologie, Hamburg. Simulation of the SAR system is achieved with the help of a comprehensive software simulation model (SARSIM) on the DFVLR computing system. The results indicate that spectra produced by the 4-bit conversion are not significantly degraded from the optimum, but that the 2-bit conversion requires some gain adjustment for optimal spectral reproduction. The conclusions are supported by images and spectral plots covering the various options simulated.
- Publication:
-
ESA Journal
- Pub Date:
- 1985
- Bibcode:
- 1985ESAJ....9..287P
- Keywords:
-
- Computerized Simulation;
- Data Simulation;
- Ers-1 (Esa Satellite);
- Satellite-Borne Radar;
- Video Signals;
- Water Waves;
- Analog To Digital Converters;
- Ocean Surface;
- Radar Cross Sections;
- Relief Maps;
- Synthetic Aperture Radar;
- Communications and Radar