The construction of China's deep space network supports China's deep space missions,such as explorations of Lunar,Mars,Small planets,Jupiter,and etc. To validate China's deep space network performance and obtain the radio measurement raw data,dozens of radio open loop measurement experiments of Juno which is one of Jupiter's probe on orbit were accomplished. These open loop measurement experiments are the first time conducted by the China's deep space stations tracking a in-orbit probe in Earth-Jupiter distance. VLBI terminate sampling and recording facilities were utilized to record Juno's raw carrier signal,which was processed to extract Doppler frequency between Juno and the deep space station. In this paper,the combining method of Fast Fourier transform,Chirp Z transform and signal local reconstruction was utilized to obtain Juno's Doppler frequency. The results show that Juno's open loop Doppler frequency is at the level of 10 μHz,which effectively validated the method of deep space open loop measurement and provide valuable reference for China's future deep space missions.

A suit of radio interferometry data processing system based on open source software such as Distributed FX (DiFX),Spacecraft Planet Instrument Camera-matrix Events (SPICE),Haystack Observatory Postprocessing System (HOPS)and Astronomical Image Processing System (AIPS)used for data correlation processing of deep space detector signals has been built to carry out a better radio interferometry experiment.Architecture and composi-tion of the system were introduced and operational principle and functions of each module were de-scribed.Observations with Chang'e-3 lander were made and experiment data was processed using the data processing system.The results show that the system realizes the functions of correlation processing,fringe fitting and time-de-lay estimation for deep space detector signals,validating capability of the system to provide support to data process-ing in China's Chang'e-5 mission and Mars exploration missions.

"卡西尼号"（Cassini）探测器于北京时间1997年10月15日发射升空,经过6年8个月漫长太空旅行后进入环绕土星的轨道,开展土星系统探测任务,并于2017年9月15日坠入土星大气层,完成最后科学使命。20年间,Cassini任务取得了为数众多的科学与技术成果和全新的科学发现。在2017年9月15日Cassini探测器谢幕之旅中（图1）,北京航天飞行控制中心联合西安卫星测控中心佳木斯