A Time-Difference RTK Model Considering Ephemeris Error

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A Time-Difference RTK Model Considering Ephemeris Error

Liu, Chunhe / Chai, Hongzhou / Xiang, Minzhi

The time difference RTK (TDRTK) of GNSS can obtain high-precision relative position information, which can be used to constrain the cumulative error of positioning methods such as inertial navigation system. However, with the increase of time interval, the cumulative error over time seriously affects the fixed success rate of differential ambiguity and relative positioning accuracy. Through in-depth analysis of the factors affecting TDRTK, it is found that the epoch difference of broadcast ephemeris error can reach the decimeter level, which is the main factor affecting the fixed success rate of differential ambiguity. In this paper, the influence of ephemeris error on the positioning is weakened by three carrier ambiguity resolution and robust M-estimation, and the quality of positioning accuracy con-trolled by the isotropy-based protection level. Experimental results show that this method can effectively improve the fixed success rate of differential ambiguity and positioning accuracy.