constrained UPPP model

On Enhanced PPP with Single Difference Between-Satellite Ionospheric Constraints
Yan Xiang, Xin Chen, Ling Pei, Yiran Luo, Yang Gao, and Wenxian Yu
- NAVIGATION: Journal of the Institute of Navigation March 2022, 69 (1) navi.505;
- DOI: https://doi.org/10.33012/navi.505