| 非静止轨道卫星信道多普勒频移特性 |
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| 引用本文： | 韩力,吴向春,罗伟雄.非静止轨道卫星信道多普勒频移特性[J].北京理工大学学报,2005,25(2):143-146. |
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| 作者姓名： | 韩力 吴向春 罗伟雄 |
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| 作者单位： | 北京理工大学信息科学技术学院电子工程系,北京,100081;北京理工大学信息科学技术学院电子工程系,北京,100081;北京理工大学信息科学技术学院电子工程系,北京,100081 |
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| 摘 要： | 为了定量分析非静止轨道卫星信道的多普勒频移特性,引入一种基于地心固连坐标系的分析模型,经近似,该模型与地面接收终端的地理坐标无关.计算出了几种典型非静止轨道卫星信道的最大多普勒频移.分析表明,高仰角状态下信道中的多普勒频移较弱,而处于可视仰角状态时信道中的多普勒频移最大.应尽可能在高仰角状态下接收信号,并可将多普勒时变规律作为先验信息用于对多普勒频移进行估计与补偿,以削弱时间选择性衰落的影响.
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| 关 键 词： | 非静止轨道卫星 多普勒频移 地心固连坐标系 时间选择性衰落 |
| 文章编号： | 1001-0645(2005)02-0143-04 |
| 收稿时间： | 4/6/2004 12:00:00 AM |
| 修稿时间： | 2004年4月6日 |
Doppler Shift Characterization for Non-GEO Satellite Channels |
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| HAN Li,WU Xiang-chun and LUO Wei-xiong.Doppler Shift Characterization for Non-GEO Satellite Channels[J].Journal of Beijing Institute of Technology(Natural Science Edition),2005,25(2):143-146. |
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| Authors: | HAN Li WU Xiang-chun and LUO Wei-xiong |
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| Institution: | Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing100081, China;Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing100081, China;Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing100081, China |
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| Abstract: | An analysis model based on the earth centered fixed coordinate frame is introduced, for achieving a quantitative analysis of Doppler shift characteristics over non-GEO satellite channels. The model is irrelative to the geographical coordinate of receiving terminals on the ground after approximative processing. The maximum Doppler shift in some typical non-GEO satellite channels are figured out. It is concluded that Doppler shift is weaker in the high elevation angle state, and is maximal in the visible elevation angle state. As a result signals should be received at the high elevation angle. In order to weaken the impact of the time-selective fading, the Doppler-time regulation as a prior knowledge can be used for estimating and compensating the Doppler shift in channels. |
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| Keywords: | non-GEO satellite Doppler shift earth centered fixed coordinate frame time-selective fading |
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