Performance Analysis of BDS/GPS Single Frequency RTK Based on MLAMBDA Methodormalsize

GNSS RTK technology is widely used in aerospace, high-precision mapping, transportation and other industries due to its high precision, high efficiency and real-time performance. At present, dual-frequency RTK technology is very mature and widely used. Single-frequency GNSS RTK has difficulties in data quality control and positioning error processing. Therefore, the accuracy of single-frequency RTK service may be limited, and its positioning performance remains to be studied. Based on the extended Kalman filter model, the MLAMBDA ambiguity search method and the ratio test method are combined with the measured data to compare and analyze the single-frequency RTK positioning performance of BDS, GPS and BDS/GPS. The results show that the single-frequency RTK positioning accuracy of the three modes is in the centimeter level in the static scene, which can meet the high-precision positioning requirements. In the dynamic scene, the ambiguity fixed rate of the three modes is above 70%, which can meet the daily positioning requirements. Regardless of static or dynamic application scenes, BDS has the highest fixed rate of ambiguity, and the time used for ambiguity resolution is short, which can enable fast RTK positioning.