However, in ionogram mode, though Digisonde works with many sounding frequencies, the resolution of Doppler shift is too low to detect ionospheric disturbances precisely.

• 而在频高图模式下；虽然工作的频点多；能够获得电子浓度的高度剖面的信息；但探测的多普勒频移的分辨率低；无法用来精确检测电离层扰动.