supported by the National Natural Science Foundation of China (Grant Nos. 40804042 and 41074115);the Post Doctor Foundation of China (Grant No. 200902445);the Fundamental Research Funds for the Central Universities (Grant No. 4081004)
The vertical ionogram can provide the important ionospheric parameters, such as critical frequency, virtual height and electron density, for ionospheric research. The oblique ionosonde has the ability to detect the io...