As studied earlier

Two-Channel Cancellation method provides a good way to remove rebound jamming to SAR.But the estimation of the phase difference of the jamming signal is difficult

because the parameters needed to estimate the phase difference is usually unknowable.An automatic way to estimate the phase difference is provided in this paper.First a minimal power criterion is designed and adopted to estimate the phase.After that

an optimization algorithm was used for its estimation.Finally the performance of the method is verified by simulation result.It proves that our algorithm has good performance.