电压失稳本质上是一种局部现象，系统的电压稳定程度可以由最易于电压失稳的功率传输路径的电压稳定性来表征。
The voltage stability degree of a power system can be represented by that of the power transmission path, which is most prone to voltage instability.
然而，由于无线网络的带宽相对较小、传输功率有限、路径不唯一，使得延时、丢包、出错等网络现象更为明显。
However, as bandwidth and transmission power are limited and the uncertain paths in wireless networks, delays, packet dropouts and errors are more likely to take place.
推导了无线电波传输路径上各点经纬度及高度坐标等参数，并在此基础上进行了波束覆盖区功率密度的估算。
On the basis of the previous work, the authors make an estimation about power density within the beam covered area.
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