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Dual Estimation Technique(DET)is mainly used to achieve unambiguous tracking of high-order BOC signals.DET has a good tracking performance,but its anti-multipath performance need to be further improved.In this paper,the method of designing a synthesized correlation function(SCF)based on step-shape code symbol(SCS)is applied to the DET.Anti-multipath performance of DET is improved by introducing the special SCS signal to participate in the coherent integration process with the received signal.