Research on multimodal SBAS technology supporting precision single point positioning

To make satellite navigation system have centimeter positioning accuracy, the technique of combining precision point positioning (PPP) with multimodal space based augmentation system (SBAS) was put forward in this paper, some key technology and function of SBAS system was research. Firstly, by the way of analyzing fundamental principle of PPP, some necessary conditions for the PPP were determined. According to those conditions, preliminary design of the multimodal SBAS was finished. Finally, summarizing usable navigation frequency of the multimodal SBAS, and according to ITU rule, the frequency band of might carrying high precision orbit and time correction data was determined.