Development of Deep Space Radio Ranging and Velocity Measurement Technology

The recent research progress of the deep space radio ranging and velocity measurement technology, including the ESA and NASA measurement accuracy improvement plan is introduced. Based on the X frequency band experimental data,using the extreme narrow phase-locked loop(PLL)and the 500 kHz ranging tone,the current situation of ranging and velocity measurement of China's deep space tracking,telemetry and command(TT&C)system is analyzed. The main error budget is analyzed and the accuracy improvement suggestions are provided. According to the deep space exploration program,the proposal of deep space measurement technology is presented,particularly the analyses of multi-frequency link scheme and the station delay bias online monitoring are given.