Abstract: Aiming at the problem of the lack of acquisition methods for high-order Double Binary Offset Carrier signals under the conditions of sinusoidal frequency modulation (SFM) interference and high dynamic coexistence, An acquisition algorithm based on discrete sinusoidal frequency modulation transform (DSFMT) combined with discrete polynomial phase transform(DPT) and linear frequency modulation Z transform (CZT) is proposed. The algorithm first performs DSFMT on the received signal. Then determine the interference position and set it to zero, then do IDSFMT to complete the suppression of SFM interference. Then use the order operation to determine the dynamic order of the signal after interference suppression, and then remove its high-order dynamic terms through DPT. Finally, the CZT Algorithm is used to acquisition the signal. The simulation results show that,under the same condition, the detection probability of this algorithm is about 17 dB higher than that of DSFMT-apFFT algorithm,about 30 dB higher than that of PMF-apFFT algorithm and about 34 dB higher than that of PMF-FFT algorithm.