Improved Velocity Determination Method by the Integration of Multi-GNSS Satellites’ Doppler and Phase Observations
Improved Velocity Determination Method by the Integration of Multi-GNSS Satellites’ Doppler and Phase Observations
Blog Article
Velocity determination as one of the widely used spatial information is essential for the location-based services.Concerned researches about Global Navigation Satellite System (GNSS) velocity determination mainly focus on copyright phase observations, which ignored the merits of multi-type observations transmitted by multi-GNSS satellites.To increase the performances of GNSS velocity determination, the Helmert variance components estimation (VCE) algorithm is introduced into the integration of Doppler and copyright phase observations, moreover a velocity vector constraint is designed with the aid of original 8-RK phase observations, constructing the condition equation, and inserting into GNSS velocity determination model.According to kinematics experiments, results show that the integrated Doppler and copyright phase observations can obtain cm/s level accuracy for E, N and U directions, with improvements of 94.1%, 93.
9% and 89.5% respectively, compared with Doppler-only Animal Art scheme.However, the obvious accuracy reductions are occurred during the satellite signal obstruction, where the corresponding improvements with 89.7%, 90.1% and 69.
4% for E, N and U directions can be obtained.Meanwhile, the constraint condition can ameliorate the impacts of signal obstruction, with the improvements of 30.8%, 8.3% and 5.0% for E, N and U directions based on the integration solution.