A novel Doppler frequency measurement method based on the closed-loop signal correlation for deep space exploration  

作　　者：Tao Deng Mao-Li Ma Qing-Bao He Qing-Hui Liu Ya-Jun Wu Xin Zheng 

机构地区：[1]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Research in Astronomy and Astrophysics》2021年第9期75-82,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(11773060,11973074,U1831137,11703070 and 11803069);the National Key Basic Research and Development Program(2018YFA0404702);Shanghai Key Laboratory of Space Navigation and Positioning(3912DZ227330001);the Key Laboratory for Radio Astronomy of CAS。

摘　　要：In deep space exploration,it is necessary to improve the accuracy of frequency measurement to meet the requirements of precise orbit determination and various scientific studies.A phase detector is one of the key modules that restricts the tracking performance of phase-locked loop(PLL).Based on the phase relationship between adjacent signals in the time domain,a novel phase detector is presented to replace the arctangent phase detector.The new PLL,which is a closed loop signal correlation algorithm,shows good performance in tracking signals with high precision and the tracking accuracy of frequency of1 second integration is close to Cramer-Rao lower bound(CRLB)when setting proper parameters.Actual data processing results further illustrate the excellent performance of the novel PLL.

关 键 词：Doppler measurement:Cramer-Rao lower bound carrier tracking:phase locked loop signal correlation 

分 类 号：P111[天文地球—天文学]