Weighted discriminator function based tracking method for binary offset carrier signals

To remove the ambiguity threat and maintain the outstanding code tracking performance of binary offset carrier (BOC) signals, an unambiguous tracking method based on weighted discriminator function (WDF) was developed. The WDF combined the noncoherent early minus late power (NELP) discriminator with the sub carrier phase cancellation technique (SCPC) discriminator to generate a discriminator function without false lock points for BOC signal tracking. Regarding BOC(10,5) signal, the simulation results show that compared with SCPC, pseudo correlation function based unambiguous delay lock loop (PUDLL) and symmetrical pulse ambiguity removing (SPAR) successively, the proposed WDF has 2. 5 dB, 5. 5 dB and 8. 3 dB improvement in terms of code tracking error. The multipath errors of WDF method are reduced to 60. 4%, 32. 8% and 38. 0%, respectively. Therefore, the proposed WDF is an effective BOC signal unambiguous tracking method with outstanding performance.