TY - JOUR T1 - High-precision unambiguous tracking technique for BDS B1 wideband composite signal JF - NAVIGATION: Journal of the Institute of Navigation JO - NAVIGATION SP - 633 LP - 650 DO - 10.1002/navi.377 VL - 67 IS - 3 AU - Yang Gao AU - Zheng Yao AU - Mingquan Lu Y1 - 2020/09/21 UR - https://navi.ion.org/content/67/3/633.abstract N2 - In the BeiDou Navigation Satellite System (BDS) B1 band, a single-sideband complex binary offset carrier (SCBOC) modulation is employed to combine the legacy and the modernized B1 signals into an asymmetric-wideband composite signal for the backward compatibility. However, SCBOC modulation has only been regarded as a means to achieve the co-existance between B1I and B1C signals, whose high-precision ranging potential is not fully understood or exploited. In this paper, a new pathway for BDS B1 receivers to further enhance their ranging precision is established for the first time, by proposing an unambiguous cross-assisted tracking (CAT) loop, which fully exploits the ranging performance of the SCBOC subcarrier and the inherent coherence between components in the composite signal. Simulation and experiment using live BDS-3 signals show that compared to the traditional tracking processing for independent components, the CAT loop can significantly improve ranging performance precision, thus providing a high-precision processing mode for the BDS B1 composite signal. ER -