Two modifications of the range-Doppler algorithm (RDA) have been proposed to solve problems of SAR platform motion instabilities. First, the multi-look processing based on the RDA with an extended Doppler bandwidth has been introduced for correction of radiometric errors. Second, the RDA has been modified to perform SAR image formation on short-time acquisition intervals to use it in a recently-developed local-quadratic map-drift autofocus (LQMDA) method. The performance of the methods is illustrated with experimental data obtained by airborne SAR systems.
 C. Oliver and S. Quegan, Understanding Synthetic Aperture Radar Images. Norwood, MA: Artech House, 1999.
 G. Franceschetti and R. Lanari, Synthetic Aperture Radar Processing. CRC Press, 1999.
 W. G. Carrara, R. S. Goodman, and R. M. Majewski, Spotlight Synthetic Aperture Radar: Signal Processing Algorithms. Boston; London: Artech House, 1995.
 I. G. Cumming and F. H. Wong, Digital Processing of Synthetic Aperture Radar Data: Algorithms and Implementation”. Norwood, MA: Artech House, 2005.
 D.M. Vavriv et. al., “Cost-effective Ku band airborne SAR with Doppler centroid estimation, autofocusing and indication of moving targets”, Proc. 2nd European Radar Conf. EuRAD2005, pp. 21-24, 2005.
 V.C. Koo et al., “A new unmanned aerial vehicle synthetic aperture radar for environmental monitoring”, Progress in Electromagnetics Research, Vol. 122, pp. 245-268, 2012.
 D.M. Vavriv et al., “X-band SAR system for light-weight aircrafts”, Proc. 15th Int. Radar Symp. IRS-2014, Gdansk, Poland, pp. 501-505, 2014.
 O.O. Bezvesilniy, I.M. Gorovyi and D.M. Vavriv, “Effects of local phase errors in multi-look SAR images”, Progress In Electromagentics Research B, Vol. 53, pp. 1-24, 2013.
 O.O. Bezvesilniy, I.M. Gorovyi, V.V. Vynogradov and D.M. Vavriv, “Range-Doppler algorithm with extended number of looks”, in Proc. Of 3rd Int. Microwaves, Radar and Remote Sensing Symp. MRRS 2011 (Kyiv, Ukraine), pp. 203-206, 2011.
 R. Bamler, “A comparison of range-Doppler and Wavenumber Domain SAR focusing algorithms “, IEEE Trans. On Geoscience and Remote Sensing, Vol. 30, No. 4, pp. 706-713, 1992.
 O.O. Bezvesilniy, I.M. Gorovyi, V.V. Vinogradov and D.M. Vavriv, “Multi-look radiometric correction of SAR images”, Radiophysics and Radioastronomy, Vol. 16, No. 4, pp. 424-432, 2011.
 P. Samczynski and K. Kulpa, “Coherent MapDrift technique”, IEEE Trans. on Geoscience and Remote Sensing, vol. 48, no. 3, pp. 1505-1517, 2010.
 I.M. Gorovyi, O.O. Bezvesilniy and D.M. Vavriv, “A novel trajectory restoration algorithm for high-resolution SAR imaging “, Proc. 15th Int. Radar Symp. IRS-2014, Gdansk, Poland, pp. 170-173, 2014.
 O.O. Bezvesilniy, I.M. Gorovyi and D.M. Vavriv, “Estimation of phase errors in SAR data by local-quadratic map-drift autofocus” Proc. 13th Int. Radar Symp. IRS-2012, Warsaw, Poland, pp. 376-381, 2012.