In order to achieve the unambiguous and antimultipath reception of the BOC (binary offset carrier) signal, the DPE (double phase estimator) was modified by introducing a strobe waveform in the prompt signal correlation process of the SPLL (subcarrier phase lock loop) integration. The modified DPE possesses multipath error mitigation performance and employs no additional correlator. The theory and the realization of the proposed approach were explained and analyzed, and the performance of the modified DPE was characterized according to the SMEE (subcarrier multipath error envelope) and the tracking jitter. Simulation results show that, compared with the conventional DPE, the proposed algorithm can provide a reduction in the SMEE area of 81.1% for signal BOC(1,1) and 75.1% for signal BOC(14,2). However, the modified DPE experiences a loss of-6 dB in terms of the postcoherent signaltonoise ratio, which impacts its tracking precision. Thus, the selection of waveform parameters involves a tradeoff between the tracking performances obtained under multipath and thermal noise conditions. Above all, the proposed method is applicable to the receiving problems of multipath environment or non weak signal case.