Performance Analysis of BDS-3/GPS Dual Frequency RTK Positioning
In order to systematically analyze and evaluate the Real-Time Kinematic(RTK)positioning performance of the B1C/B2a frequency point of the BDS-3,two sets of baselines,short baseline and medium long baseline,are selected.Three RTK positioning experiments are designed using GPS L1/L2 in combination with BDS-2 B1I/B2I,BDS-3 B1I+B3I,and BDS-3 B1C/B2a,respectively.The effective number of satellites,satellite spatial geometric strength,and positioning accuracy of each group of experiments are analyzed.The experimental results show that the minimum number of effective satellites in each group of experiments is 12,and the maximum Position Dilution of Precision(PDOP)value is 1.48,which meets the needs of high-precision positioning.Under short baseline conditions,the plane and elevation positioning accuracy of the three positioning schemes are better than 6 mm.And the 3D positioning accuracy using BIC/B2a frequency point observation data is improved by 33.6％and 16.4％compared to B1I/B2I and B1I/B3I,respectively.Under medium to long baseline conditions,the plane positioning accuracy of the three positioning schemes is better than 1 cm,and the elevation positioning accuracy is better than 3 cm.Compared to B1I/B2I and B1I/B3I,the 3D positioning accuracy using B1C/B2a frequency point observation data has increased by 25.0％and 7.7％,respectively.The experimental results demonstrate that combining GPS and BDS-3 B1C/B2a new frequency points for RTK positioning can achieve good results.
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