There are both across-track and along-track baseline in Distributed Small Satellites Synthetic Aperture Radar(DSS-SAR)

which complicates the correlation of DSS-SAR echoes.After modeling the single-look complex SAR image in DSS-SAR

the new correlation model for DSS-SAR echoes was proposed and derived.According to the relationship between correlation and phase difference of the DSS-SAR image pair

it is proposed that the phase difference of DSS-SAR complex image pair in DSS-SAR includes two parts:one is interferometric phase which is related to terrain elevation

another is azimuth phase which is brought from the along-track baseline and will decrease the terrain height accuracy dramatically.Then a new step

that is applied to remove the azimuth phase

must be added to the interferometric SAR data processing in DSS-SAR and the implementation of the azimuth phase removing step is presented.In the end

computer simulation is given and the results validate the correction of analysis in this paper.