RADARSAT-1 Single Beam Operational Modes
In Single Mode operation, the beam elevation and profile were maintained constant throughout the data collection period. A beam is characterized by its:
- Nominal incidence angle
- Nominal swath width
- Nominal spatial resolution
RADARSAT-1 ScanSAR Operational Modes
There were two ScanSAR modes on RADARSAT-1: ScanSAR Narrow and ScanSAR Wide.
In ScanSAR operations, two, three or four single beams were used during data collection. Each beam was selected sequentially so that data was collected from a wider swath than was possible with a single beam. The beam switching rates were chosen to ensure at least one "look" at the Earth's surface for each beam within the along track illumination time or dwell time of the antenna beam. In practice, the radar beam switching was adjusted to provide two looks per beam.
The beam multiplexing inherent in ScanSAR operation reduced the effective sampling rate within each of the component beams. As a result, the increased swath coverage was obtained at the expense of spatial resolution.
For technical details on the RADARSAT-1 beam modes, refer to the Product Definition