A near-realtime geolocated and radiometric corrected low-resolution ERS-1 SAR image product

An operational algorithm is developed and implemented for geolocation and radiometric correction of the near-realtime low-resolution ERS-1 SAR image product from Tromso Satellite Station (TSS). Latitude and longitude grids and land-contours are mapped into the image. The radiometric correction adjusts the pixel intensity for varying antenna gain across the swath and range spreading loss. The antenna gain is based on the ESA obtained in-flight ERS-1 SAR antenna pattern. The computing time exclusive the SAR processing, which roughly takes 6 minutes on the TSS SAR processor, is only about 1-2 minutes on a Sun Sparc 2 computer