| Communication-based positioning systems： past, present and prospects |
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| 基金项目： | Acknowledgements The authors wish to thank Guoxiang Ai for helpful discussions and sugges- tions. Lihua Ma, Jie Zhang and Meng Wang are also acknowledged. This project is supported by the Pilot Program for the New and Interdisciplinary Subjects of the Chinese Academy of Sciences （Grant No. KJCX2-EW-J01） and the Knowledge Innovation Program of the Chinese Academy of Sciences （Grant No. KGCX2-EW-407-1）. |
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| 摘 要： |
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| 关 键 词： | 移动通信系统 定位系统 地球同步通信卫星 LEO卫星 地球静止轨道 CAPS 定位技术 导航信息 |
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