Aiming at the flexibility and diversity of B1C signal acquisition, the nonmatching acquisition of TMBOC signal and BOC(1,1) signal is proposed. Firstly, the mathematical model of B1C signal is established, and the principle of algorithm research is mathematically deduced. Secondly, the detection probability of signal acquisition is analyzed, and the theoretical analysis of the signaltonoise ratio loss in nonmatching acquisition is given. The B1C signal is used for acquisition analysis. The simulation shows that the BOC(1,1) signal acquisition can obtain a higher peaktoaverage ratio, while the TMBOC signal has a better peaktoaverage ratio when capturing the B1C signal pilot component, but the overall peaktoaverage ratio is reduced by about 046 dB. The research of the algorithm provides a new idea for B1C signal synchronization.