Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) is a new conceptual SAR system.This paper analyses the effect of the platform’s continuous motion in squint FMCW SAR

i.e.generating Doppler frequency shift

and its effect on image focusing.Considering the deficiency of the present FS algorithm in the case of high squint angle

this paper proposes an equivalent side-looking method for squint FMCW SAR.After pre-processing for the squint SAR data

we can use the imaging algorithm for side-looking mode to process the squint SAR data;for the azimuth focusing depth induced by the pre-processing

this paper utilizes the azimuth non-linear chirp scaling algorithm to overcome this phenomenon.At last

imaging results of the simulated data have proved the validity of the proposed algorithm.