摘要
从地空通信的原理出发,分析了地空通信的通信覆盖能力与空中平台升空高度以及天线仰角的关系,给出了地面反射二径模型,分析了地空信道的衰落特性、误码性能以及在分集接收条件下的误码性能改善,并进行了相应的仿真,给出了相应的仿真结果。仿真结果表明地空通信信道的衰落十分明显,对信息传输性能造成不可忽视的影响,并且在低莱斯因子条件下,采用分集接收技术可有效对抗信道衰落,且对传输误码性能有明显改善,这些结论对今后的工程设计与实现提供重要参考和指导。
Starting with the principle of Ground-to-air communication,the relationship between communication coverage distance and lift-off height of the airplatform and elevation angle of antenna on the ground are analyzed.The 2-ray model of ground reflection is presented.The fading characteristics and error performance and its improvement under diversity reception are analyzed in this paper,and the realization method and simulation results are also presented.The simulation results show that the fading of ground-to-air channel is apparent and the influence to transmitting performance is not ignore,moreover,with low Rician factor,adopted the diversity and reception technology can be used to realize effective anti-fading of Rician channel and improve significantly the error performance.These conclusions can provide an important theoretical reference and guidance for engineering design and realization in the future.
出处
《无线电工程》
2012年第2期10-12,31,共4页
Radio Engineering
关键词
地空信道
莱斯信道
衰落
多径
分集
ground-to-air channel
rice channel
fading
multi-path
diversity
