Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China;
Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 ChinaKey Laboratory of Radio Astronomy Chinese Academy of Sciences Nanjing 210008 ChinaShanghai Key Laboratory of Space Navigation and Positioning Techniques Shanghai 430074 China;
Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China;
Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China;
Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 ChinaUniversity of Chinese Academy of Sciences Beijing 100049 China;
microwave; holography-radio; astronomy-surface; deviation-least; squares method;