Abstract: A method for cancelling azimuth, i.e., doppler ambiguity, in a SAR receiver on board a moving craft, e.g., an aircraft, which permits a lower PRF, without causing range ambiguity. Radar returns are received on board the craft with an antenna having first and second apertures to produce corresponding first and second return signals. The first return signal is processed over a given time period to generate a first series of component SAR signals representing radar returns from respective cells of an azimuth-range grid. The second return signal is processed over the given time period to generate a second series of component SAR signals representing radar returns from the respective cells of the azimuth-range grid. The component signals, individually weighted, are additively combined to produce a third series of resultant SAR signals representing the radar returns from the respective cells of the azimuty-range grid.