In SAR remote sensing, a broad footprint implies that fewer missions are required to map the region of interest. More importantly, for general applications, this will also imply that a given region of the earth can be repeatedly mapped with a greater frequency. The width of the ground area covered on a single pass is usually referred to as the swath width of the system. In a typical spaceborne SAR, the swath width is of order 100 km, coupled with a revisit time to a given area of approximately three days. Although this may be adequate for the surveillance of certain features, such as geologic formations and crops, for many other more dynamic features, such as ocean, ice and man-made targets, there could be a requirement ...
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