本文在GIS(Geographic Information System)空间分析技术支持下,结合COST231-Hata与自由传输模型进行GSM高频频段适用性研究,针对陇南丘陵山区地理环境下的通信覆盖及传输损耗进行预测计算,得到了研究区内基站信号各类传播损耗分级、强...本文在GIS(Geographic Information System)空间分析技术支持下,结合COST231-Hata与自由传输模型进行GSM高频频段适用性研究,针对陇南丘陵山区地理环境下的通信覆盖及传输损耗进行预测计算,得到了研究区内基站信号各类传播损耗分级、强度及各类空间可视化仿真。对于大尺度区域基于确定型传播模型的研究发现,COST231-Hata在GIS技术支持下,为GSM移动网络规划与优化提供了信号覆盖与损耗的预测可视化解决方案,解决了移动信号覆盖强弱可视化交互模式下模型参数分析、基站传播路径损耗预测计算、仿真结果计算分析的流程问题,为移动通信覆盖与传播预测提供工程技术方案支持,有较强的实用价值。展开更多
A multi-channel free space optical interconnection component, fiber optic rotary joint, was designed using a Dove prism. When the Dove prism is rotated an angle of at around the longitudinal axis, the image rotates an...A multi-channel free space optical interconnection component, fiber optic rotary joint, was designed using a Dove prism. When the Dove prism is rotated an angle of at around the longitudinal axis, the image rotates an angle of 2 at. The optical interconnection component consists of the signal transmission system, Dove prim and driving mechanism. The planetary gears are used to achieve the speed ratio of 2：l between the total optical interconnection component and the Dove prism. The Clenses are employed to couple different optical signals in the signal transmission system. The coupling loss between the receiving fiber of stationary part and the transmitting fiber of rotary part is measured.展开更多
文摘本文在GIS(Geographic Information System)空间分析技术支持下,结合COST231-Hata与自由传输模型进行GSM高频频段适用性研究,针对陇南丘陵山区地理环境下的通信覆盖及传输损耗进行预测计算,得到了研究区内基站信号各类传播损耗分级、强度及各类空间可视化仿真。对于大尺度区域基于确定型传播模型的研究发现,COST231-Hata在GIS技术支持下,为GSM移动网络规划与优化提供了信号覆盖与损耗的预测可视化解决方案,解决了移动信号覆盖强弱可视化交互模式下模型参数分析、基站传播路径损耗预测计算、仿真结果计算分析的流程问题,为移动通信覆盖与传播预测提供工程技术方案支持,有较强的实用价值。
基金the National Natural Science Foundation of China (No. 60577013)program for New Century Talents in University,Ministry of Education of China
文摘A multi-channel free space optical interconnection component, fiber optic rotary joint, was designed using a Dove prism. When the Dove prism is rotated an angle of at around the longitudinal axis, the image rotates an angle of 2 at. The optical interconnection component consists of the signal transmission system, Dove prim and driving mechanism. The planetary gears are used to achieve the speed ratio of 2：l between the total optical interconnection component and the Dove prism. The Clenses are employed to couple different optical signals in the signal transmission system. The coupling loss between the receiving fiber of stationary part and the transmitting fiber of rotary part is measured.
