Research on the Tower Pole Tilt Mechanism and Risk Assessment Technology Based on BeiDou reverse network RTKZhi Shen, Wei Yu, Bao Song, Hongwu Wang, Junpeng Li, Jing Jin, Yifan Zhang and Mingming WangE3S Web Conf., 165 (2020) 03011DOI: https://doi.org/10.1051/e3sconf/202016503011