Application of BDS-3 PPP-B2b Signal Service in the Measurement of Vertical Deviation

In order to further improve the measurement accuracy of vertical deviation and expand the application of astrogeodesy. Based on the theory of astrogeodesy, combined with the real-time PPP provided by BDS-3 and Digital Zenith photographing positioning model, this paper analyzes the principle and related work flow of the vertical deviation in detail, gives the relevant error correction model of the real-time PPP, and deduces the error calculation model in the measurement of Helmert vertical deviation. Through theoretical analysis and actual measurement verification, The real-time PPP provided by BDS-3 PPP-B2b signal is better than 0.1 m in the horizontal direction and 0.2 m in the elevation direction under static measurement mode. combined with the current high-precision zenith photograph positioning system, the vertical deviation measurement accuracy can be better than 0.06 '' in the meridian component and 0.08 '' in the unitary component. The research results can provide theoretical and data reference for the establishment of high-precision gravity field model and geoid refinement in China.