Azimuthal Resolution Degradation Due to Ocean Surface Motion in Focused Arrays and SARS
Abstract
During the meeting at WHOI (5-18-90), a discussion of the ability of the focused array to simulate the R/v ratios typical of airborne/spaceborne SARs arose. In particular, we questioned the ability of the focused array to yield the same azimuthal resolution, rho, as the SAR. Although the focused array can be sampled to yield the same azimuthal resolution as the SAR, it is likely that the images generated by the focused array will not be identical to those produced by a SAR with the same azimuth resolution. For a true SAR, biases in the Doppler history of azimuthally traveling waves due to their along-track motion will cause shifts in their apparent position. This will cause waves which are physically at one location to shift over several pixel widths in the image. The limited swath width of the focused array will prevent if from observing scattered power from waves falling outside the swath, thus such waves will not affect the image formed within the swath, as would happen in the SAR. Thus, it is likely that the focused array will not yield the same image as a SAR having the same resolution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 18, 1990
- Accession Number
- ADA223315