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doppler radial velocity detection based on doppler asymmetric spatial heterodyne spectroscopy technique for absorption lines

引用

Chinese Physics B 2020年第2期29卷 183-189页

作者： Yin-Li Kuang Liang Fang Xiang Peng Xin Cheng Hui Zhang En-Hai Liu Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China University of Chinese Academy of Sciences Beijing 100049China

doppler asymmetric spatial heterodyne spectroscopy(DASH)technique has developed rapidly in passive doppler-shift measurements of atmospheric emission lines over the last *** the advantages of high phase shift sensitivity,compact,and rugged structure,DASH is proposed to be used for celestial autonomous navigation based on doppler radial velocity measurement in this *** atmospheric emission lines,almost all targeted lines in the research field of deep-space exploration are the absorption lines of stars,so a mathematical model for the doppler-shift measurements of absorption lines with a DASH interferometer is *** to the analysis of the components of the interferogram received by the detector array,we find that the interferogram generated only by absorption lines in a passband can be extracted and processed by a method similar to the approach to studying the emission *** the end,numerical simulation experiments of doppler-shift measurements of absorption lines are carried *** simulation results show that the relative errors of the retrieved speeds are less than 0.7%under ideal conditions,proving the feasibility of measuring doppler shifts of absorption lines by DASH instruments.

关键词： doppler asymmetric spatial heterodyne spectroscopy(DASH) doppler-shift measurement absorption line celestial autonomous navigation

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CRAMER-RAO BOUNDS OF THE FREQUENCY ESTIMATION IN THE TIME SELECTIVE RADIO CHANNELS WITH doppler SPREAD

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Journal of Electronics(China) 2006年第2期23卷 165-171页

作者： Hua Jingyu Yang Xin You Xiaohu National Communications Research Lab Southeast University Nanjing 210096 China

The mobile channel is slow fading and time selective, thus the multiplicative and additive noise of the channel will smear the spectral line, or arouse doppler spread. This spread will make the parameters estimation accuracy degrade. The goal of this paper is to analytically assess this degradation when Carrier Frequency Offset (CFO) and doppler shift exist jointly. Then the finite-sample Cramer-Rao Lower Bound (CRLB) is derived and close-form asymptotical expression is given for large-sample CRLB. These expressions give insights into the performance room for frequency estimation. Also the variance of doppler shift estimator is simulated to illustrate the theoretical results.

关键词： Cramer-Rao Lower Bound (CRLB) Time selective channel doppler-shift

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