Type of contribution: drop
Session: 3

Multi-frequency Same Beam VLBI Method Based on General TT\& C Signal

Lue Chen, Beijing Aerospace Control Center Geshi Tang, Beijing Aerospace Control Center Ming Chen, Beijing Aerospace Control Center Huicui Liu, Beijing Aerospace Control Center Hongtao Han, Beijing Aerospace Control Center Mei Wang, Beijing Aerospace Control Center Li Li, Beijing Aerospace Control Center

The relative measurement of two spacecrafts is very important for multi-spacecrafts cooperative flight mission and improving spacecraft's orbit determination accuracy for space science exploration research. The method of multi-frequency same beam VLBI utilizing general Tracking, Telemetry and Control (TT\&C) signal is proposed to implement two spacecrafts relative positioning in this paper. Based on the mathematical calculation of the difference phase delay, the validity of this method in deep space mission is verified by simulation. A model modification method of differential delay measurement error is proposed, and the observing condition of same beam VLBI utilizing ground measurement stations is analyzed. Utilizing the multi-frequencies information of the general TT\&C signal of the two spacecrafts, the simulation results shows that picoseconds level differential delay measurement value is obtained via delay error model modification. This could provide reliable measurement technology for relative navigation and position between two spacecrafts in deep space mission.