一、视线距离的计算和超短波通讯距离的估计一般认为超短波是直线传播的,即超短波的通讯距离只能在视线范围内。虽然已有许多例子证明,由于大气的折射等原因,超短波的传播可超出直视范围以外的可能性,但为了通讯的可靠性,我们先从收发天线都架设在视线距离范围内来研究架设多高的天线,能达到最大通讯距离。如图1所示:A点为发讯天线位 First, the calculation of line-of-sight distance and the estimation of the communication distance of the ultrashort wave It is generally considered that the ultrashortwave is transmitted in a straight line, that is, the communication distance of the ultrashortwave can only be within the line of sight. Although many examples have proved that the propagation of ultrashortwave can exceed the out-of-sight range due to the refraction of the atmosphere, etc., for the sake of communication reliability, we first study how the erection and reception antennas are located within the line of sight distance High antenna, to achieve the maximum communication distance. As shown in Figure 1: A point for sending antenna