Spacecraft Doppler tracking with possible violations of LLI and LPI:upper bounds from one-way measurements on MEX  

作　　者：Yi Xie Yong Huang 

机构地区：[1]School of Astronomy and Space Science,Nanjing University [2]Shanghai Key Laboratory of Space Navigation and Position Techniques [3]Key Laboratory of Modern Astronomy and Astrophysics,Nanjing University,Ministry of Education [4]Shanghai Astronomical Observatory,Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2015年第10期1751-1757,共7页天文和天体物理学研究（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.11103010,11573015 and 11073047);the Fundamental Research Program of Jiangsu Province of China under No.BK2011553;the Research Fund for the Doctoral Program of Higher Education of China(No.20110091120003);the Fundamental Research Funds for the Central Universities(Grant No.20620140586);the Opening Project of Shanghai Key Laboratory of Space Navigation and Position Techniques(Grant No.14DZ2276100)

摘　　要：We analyze the post-fit residuals of one-way Doppler tracking data from the Mars Express （MEX） spacecraft to test possible violations of local Lorentz invariance （LLI） and local position invariance （LPI）. These one-way Doppler observations were carried out on 2011 August 7 for about 20 minutes at Sheshan Station of Shanghai Astronomical Observatory in China. These downlink signals were sent by MEX for telemetry at X-band. Because we are not able to decode the data in the form of teleme- try and separate them from the carrier frequency, this makes the post-fit residuals of the Doppler data degrade to the level of 0.1 m s^-1. Even so, the residuals can still impose upper bounds on LLI and LPI at 10^-1, which is consistent with the prediction based on our analysis of the detectability. Although the upper bounds given by three-way Doppler tracking of MEX are better than those obtained in the present work, one-way Doppler measurements still provide a unique chance to test possible violations of LLI and LPI far from the ground stations.We analyze the post-fit residuals of one-way Doppler tracking data from the Mars Express （MEX） spacecraft to test possible violations of local Lorentz invariance （LLI） and local position invariance （LPI）. These one-way Doppler observations were carried out on 2011 August 7 for about 20 minutes at Sheshan Station of Shanghai Astronomical Observatory in China. These downlink signals were sent by MEX for telemetry at X-band. Because we are not able to decode the data in the form of teleme- try and separate them from the carrier frequency, this makes the post-fit residuals of the Doppler data degrade to the level of 0.1 m s^-1. Even so, the residuals can still impose upper bounds on LLI and LPI at 10^-1, which is consistent with the prediction based on our analysis of the detectability. Although the upper bounds given by three-way Doppler tracking of MEX are better than those obtained in the present work, one-way Doppler measurements still provide a unique chance to test possible violations of LLI and LPI far from the ground stations.

关 键 词：space vehicles -- techniques： radial velocities -- gravitation 

分 类 号：V476[航空宇航科学与技术—飞行器设计]