Due to the frequency selectivity, non-stationary and multipath effect of the ionosphere, it is difficult to measure the beam width of OTHR antenna in azimuth of this kind of radar.

• 摘要由于传输信道电离层存在频率选择性、非平稳性和多径效应，对天波超视距雷达的方位波束宽度性能进行测试存在着相当的困难。