Abstract:In order to study the feasibility of measuring earth rotation parameters by digital zenith photographing and positioning method, we combine the principle of digital zenith photographing and positioning with the difference of space-time datum conversion, and analyze the earth rotation parameters by multi-stations and UT1-UTC measurement principle by single station. The relevant mathematical models are derived. The simulation and actual measurement verification results show that the current high-precision zenith photographing and positioning system (accuracy 0.05″) can achieve the measurement accuracy of ±5 ms for UT1-UTC parameters and ±0.06″ for polar motion parameters through reasonable station layout nationwide. In addition, the measurement accuracy of UT1-UTC by single station is 5-8 ms, which can meet the needs of specific military engineering, and provide data support for the joint calculation of ERP parameters by multi-stations. The research results can provide theoretical reference for the development of earth rotation parameters measurement in China.
REN Lei,CHANG Junqin,YIN Dongshan et al. Research on the Measurement of Earth Rotation Parameters Based on Digital Zenith Camera[J]. jgg, 2022, 42(4): 343-348.