Solution to some limitations of frequency-entangled-based sensor applied in GRACE-like mission

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• 作者：Yanghe Shen^a ; ^{shenyanghe@stu.xidian.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Luping Xu^a ; ^{yizifeixian@163.com" class="auth_mail" title="E-mail the corresponding author} ; Hua Zhang^a ; ^{zhanghua@mail.xidian.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yingtong Zhu^b ; ^{zhuyt_xd@163.com" class="auth_mail" title="E-mail the corresponding author} ; Pengfei Cheng^a ; ^{pfcheng@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Frequency-entangled-based sensor ; Limitations ; Shortening the accumulated time ; Introducing the time-varying delay
• 刊名：Advances in Space Research
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：57
• 期：3
• 页码：867-879
• 全文大小：577 K

文摘

Although frequency-entangled-based (FEB) sensor has advantages of precise ranging accuracy and potential enhanced safety, its performance of the distance measurement becomes poor during GRACE and some other GRACE-like missions (GRAIL) that are located at low Earth orbit (LEO) or have a large inter-satellite distance. Thus, the primary purpose of this study is to analyze the essential cause of the above limitations and to propose two types of techniques to solve them, i.e., shortening the accumulated time T_a and introducing the time-varying delay. Using a specific configuration of the entangled photons source, T_a is shortened to 0.126 s and the ranging accuracy can be lowered to 57.58 cm. However, affected by relative motion, this improved accuracy is still worse than what we expect. Adopting the shortened value of T_a of 0.126 s, we can essentially cancel the effect of relative motion by introducing the time-varying delay, and obtain a narrow accumulated profile determining a ranging accuracy in an order of mm which is only restricted by the resolution of coincidence system.