The spacecraft synthetic aperture radar (SAR) data processing functions required to produce real-time imagery can be accomplished by time domain correlation in the range and azimuth dimensions. Charge-coupled device (CCD) large-scale integration (LSI) technology may be used to implement range and azimuth correlators that are practical for future on-board applications. An already demonstrated N-stage CCD LSI transversal filter chip, providing N signal-by-weighting coefficient multiplications each clock period, offers a poten-tially attractive basis for achieving the range correlation function. Furthermore, a custom CCD LSI azimuth filter chip, currently under development by the Caltech Jet Propulsion Laboratory (JPL), provides a potentially practical means for individually performing all of the necessary parametric corrections and correlation functions to produce complete image lines from range correlated data. By using M such azimuth filter chips in parallel, corres-ponding to the number of pulses coherently integrated in azimuth, a real-time processing capability can be achieved. This paper describes (1) applicable SAR processing principles, (2) typical requirements associated with real-time SAR processing, and (3) a real-time on-board SAR processing implementation approach using the aforementioned CCD techniques for achieving the range and azimuth correlation functions.