脉冲调制可以用来控制偏置电压和电离。
Pulse modulation may be used to control a bias voltage and an ionization.
这种模式是非常敏感的电离层多普勒调制。
This mode is very sensitive to the ionospheric Doppler modulation.
电离层频率调制导致地表面杂波的多谱勒展宽，极大地限制了高频天波雷达的目标探测性能。
Ionospheric frequency modulation causes spreading of the surface clutter in Doppler domain which greatly limits the detection performance of HF sky-wave radars.
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