TY - JOUR A1 - Liu, Y. A1 - Wang, C. A1 - Luo, G. A1 - Ji, W. T1 - Design and applications of drilling trajectory measurement instrumentation in an ultra-deep borehole based on a fiber-optic gyro JO - Geosci. Instrum. Method. Data Syst. J1 - GI VL - 9 IS - 1 SP - 79 EP - 104 Y1 - 2020/03/19 PB - Copernicus Publications SN - 2193-0864 UR - https://gi.copernicus.org/articles/9/79/2020/ L1 - https://gi.copernicus.org/articles/9/79/2020/gi-9-79-2020.pdf DO - 10.5194/gi-9-79-2020 ER -