摘要
在地面视距传播中，可能会出现满足自由空间传播条件的情况，但自由空间模型的应用必须考虑传播距离的限制。对限制自由空间模型应用的临界距离进行了理论上的探讨，对临界距离的计算公式进行了推导，并对其物理意义和应用范围进行了分析说明。
The free-space propagation condition might be satisfied for the ground line of sight propagaation, however, the distance limitations of free-space model must be considered. In this paper, the theorietical critical distance of free space model is discussed, the critical distance formula is deducted, and the physical meaning and applications of the critical distance are analysed.
出处
《通信对抗》
2008年第4期30-31,35,共3页
Communication Countermeasures
关键词
视距传播
自由空间模型
地面反射模型
临界距离
line of sight propagation
flee-space model
ground reflect model
critical distance
