Target geolocation using SAR

The paper provides an analysis of SAR target geolocation accuracy due to aircraft motion errors. It studies the nature of errors in INS and GPS navigation systems and relates them to achievable SAR geolocation accuracy. The nature of the INS errors was found using a computer simulation. The GPS error characteristics were acquired from a stationary P-code receiver. The results of the study show that the target geolocation accuracy when using the INS alone is of the same order as the positional accuracy of the INS. The GPS study concluded that it is possible to have a geolocation accuracy of <4–5 m from stand-off ranges of 20–50 km, using a state of the art GPS receiver.