Planetary radio science measurement scheme based on the downlink signals of China's first Mars probe

The deep space telecommunication link performance will be seriously affected by the solar wind and solar corona, during the superior solar conjunction. The impacts of inhomogeneous solar wind are discussed, such as intensity scintillation, phase scintillation and spectral broadening. The influence of solar wind and corona on communication reflects its irregular internal structure. Observations of solar wind and corona are of great significance in the study of solar evolution, solar outer atmosphere, solar-terrestrial space and geophysics. In addition, occultation observation is also one of the important tools for studying the composition and structure of the planet's atmosphere. The first Mars probe of China will be launched in 2020, and in order to meet the requirements of the massive scientific data, the downlink data transmission will be performed using an antenna array, including at least Miyun 50m and 40m, Wuqing 70m and Kunming 40m four antennas. Planetary radio science measurements of the entire time of the Mars probe will be performed throughout the data reception and VLBI orbital determination, including carrier phase, signal to noise ratio and power spectrum. The high-precision digital terminals have been designed and are being developed to meet the needs of the Mars other deep space probes downlink signals measurement.