Low-cost Vehicle GNSS Positioning Algorithm Using SSR2OSR Method

Vehicle positioning platforms can greatly benefit from a centimeter-level accuracy GNSS positioning solution with Network RTK service or PPP SSR service. Based on the double differenced (OD) algorithm, Network RTK service has an ability of making the vehicles receive real time OSR corrections to realize the integer ambiguity resolution. PPP SSR service can broadcast the real time information of satellite signal to users, such as precise orbit, clock, biases, and atmospheric corrections. This study proposed an alternative method to conduct the SSR correction for achieving the instantaneous high-precision positioning. Virtual ambiguity-free phase and pseudorange observation were used to realize the RTK ambiguity resolution. RTK ambiguity resolution was used in low-cost GNSS receiver. In this study, the selected SSR corrections were collected from Qianxun SI’s SSR satellite-based augmentation platform. The reliability and stability of the proposed algorithm in this study were both tested and verified for the consideration of the real-time high-dynamic environment.