BDS-3 quad-frequency long baseline positioning algorithm considering ionospheric delay

doi:10.13474/j.cnki.11-2246.2023.0107

Abstract

Abstract: Considering that ionospheric delay in long baseline positioning can affect the positioning accuracy, this paper proposes a quad-frequency ionosphere-free (IF) combination method based on BDS-3 four-frequency signals (B1C/B1I/B2a/B3I), which eliminates the ionospheric delay error by using the combined ionosphere-freeobservations and constructs the positioning equation by combining the ambiguity-corrected extra-wide-lane or wide-lane combination observations, so as to estimatethe raw narrow-lane ambiguity and baseline coordinates. The experiments are conducted to compare the positioning accuracy of quad-frequency IF combination method and ionospheric delay parameter estimation method based on GB-FCAR modelusing BDS-3 quad-frequency data. The results show that when long baseline is over 500 km,the quad-frequency IF combination method can eliminate ionospheric delay error. Compared with the ionospheric delay parameter estimation method, the positioning accuracy of the quad-frequency IF combination method can reach the decimeter level in both horizontal and vertical directions,the improvement can reach more than 35% and 40% respectively,which significantly improves the positioning accuracy. The relative positioning accuracy can reach 1×10^-9 m, which meets the relative positioning requirements of long baselines.

Key words: BDS-3, quad-frequency, long baseline, parameter estimation, ionosphere-free combination

CLC Number:

P228

Lü Zhen, WANG Zhenjie, LIU Jinping, ZHAI Jianpeng, ZHOU Hao. BDS-3 quad-frequency long baseline positioning algorithm considering ionospheric delay[J]. Bulletin of Surveying and Mapping, 2023, 0(4): 71-78.

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