Robust unambiguous ranging technique for BDS-3 B1 wideband composite signals

During the evolution of global navigation satellite systems (GNSS), many new GNSS signals have been proposed to meet the demand of various applications for high-precision positioning. The single-sideband complex subcarrier (SCBOC) modulated signals, which are contained in China's third-generation BeiDou Navigation Satellite System (BDS-3) B1 wideband composite signals, have extremely high-precision ranging potential. Although high-precision ranging performance of SCBOC signals has been demonstrated by implementing a cross-assisted tracking (CAT) technique in previous studies, ambiguity threats are not effectively relieved, resulting in ambiguous ranging. Therefore, we propose a robust unambiguous ranging technique, which utilizes an ambiguity model established by observations derived from CAT to resolve ambiguous ranging results. Simulation experiments are implemented to quantitatively evaluate the proposed method’s performance and explore its effective ranges. Real data experiments are also implemented in static and dynamic cases to furtherly verify the effectiveness of the proposed method, exhibiting that the proposed method can take full advantage of the high-precision ranging potential contained in BDS-3 B1 wideband composite signals with less ambiguity threats.