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中文摘要：
利用中国VLBI网无线电天线和数字信号采集系统跟踪测量了欧洲航天局的＂火星快车＂（MEX）探测器,并研发了相应的三程多普勒信号提取算法和软件。对探测器8.4GHz下行载波1s采样的最终结果显示,多普勒数据随机噪声为1mm/s,这些数据已成功应用于对火星探测器的轨道确定。
英文摘要：
Using the radio telescopes in Chinese VLBI Net （CVN） and sampling board,we have developed algorithms that extract three-way Doppler information from the radio tracking data of Mars Express （MEX） – a Martian probe that belongs to European Space Agency （ESA）. Our latest results indicate that Doppler residuals of three-way Doppler are about 1mm/s in 1s integration time,relative to an 8.4GHz carrier. Three-way Doppler data have been used in the orbit determination of Mars Express.
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