GPS/BDS maritime long baseline differential positioning and analysis with additional distance constraints
In order to weaken the influence of systematic errors such as atmospheric delay residuals on positioning results in longbaseline differential positioning at the sea,a differential positioning function model with systematic errors and a longbaseline differential positioning function model with distance constraints between antennas are established.The influence of conditions on long baseline differential positioning results are also analyzed.Tests were conducted using multiple receivers on shore and ships.The results show that additional system parameters can well absorb the impact of systematic errors on positioning results in 500 km baseline differential positioning,and the positioning accuracy of GPS/BDS combination is significantly improved.After adding reasonable distance constraints to the long baseline of 442～451 km,the positioning error is reduced to within 1dm.The additional system parameters and reasonable additional inter-antenna distance constraint methods in this article can provide a reference for longbaseline differential positioning at the sea.
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