Abstract: Range migration correction (RMC) is an important procedure in high resolution synthetic aperture radar signal processing. Range-Doppler method carries out RMC by interpolation in range-Doppler domain. This paper first analyzes the range migration problem, makes research on three common used interpolation algorithms: nearest neighbor approxima-tion, Lagrange polynornial interpolation and sinc function interpolation. The general formulas of three algorithms are presented. Their calculating volume is compared. Finally, the computer imaging simulations of point target are used to analyze the algorithms effect on resulted image.