Research on evaluation of RTK positioning performance with four-system combination for different length baselines
Global navigation satellite positioning consisting of multiple systems can increase the number of available satellites to improve the positioning geometry.This paper analyzes and evaluates Real-time Kinematic(RTK)positioning performance of BDS/GPS/Galileo/QZSS combination in the Asia-Pacific region under the background of continuous construction and improvement of GNSS.First,it is found that BDS satellites in the Asia-Pacific region is more than GPS or Galileo,the positioning accuracy factor of BDS is better than those of GPS and Galileo,and the visibility and positioning accuracy factor of the four-system combination is the best.The RTK positioning accuracy with four-system combination indicates that there are no significant differences among the six baselines in different lengths in the Hong Kong CORS monitoring network,and they are basically at the same level.The positioning accuracy from RTK of the four-system combination in the E,N,and U direc-tions in the Asia-Pacific region can be up to 4.0 mm,2.2 mm,and 10.9 mm,respectively,meeting the specification requirements of RTK.
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