一引言近距离的战术通信,常常是工作在甚高频段。但在视距之外,随着通信距离的增加,这种甚高频近距离通信的效果显著变坏。为此,可利用短波从电离层反射来弥补这种情况。然而短波通信存在“静区”。如图1所示,它是地波不能到达天波也没有的一个所谓“死区”。 An introduction to close tactical communications, often working in very high frequency band. However, beyond the line-of-sight, the effect of such a VHF near-field communication deteriorates significantly as communication distance increases. For this reason, the shortwave can be used to compensate for this by reflecting from the ionosphere. However, there is a “quiet zone” for shortwave communications. As shown in Figure 1, it is a so-called “dead zone” where the ground wave can not reach the sky wave.