Satellite navigation signal simulation and testing are the necessary links in the development and construction of global navigation satellite system and navigation receiver manufacturers. The progress of related technologies reflects the level of a country’s satellite navigation system construction and application. The application of BOC signals in the BeiDou new modulation has put forward new requirements and challenges. Aiming to generate the baseband signal of BOC B1C BeiDou new modulation based on the pseudo range iteration and time-delay filtering technology, the open-source software defined receiver is used to capture, track, demodulate and locate the self-generated baseband signal. The positioning results show that the 3D positioning error variance is better than 0.74 m and the 2D positioning error variance is better than 0.43 m, which meet the simulation and test requirements.