Traveling ionospheric disturbances (TIDs) are periodic electron density fluctuating structures.It is associated with the movement of gravity waves in the upper atmosphere.On the basis of the previous research of the pundit

the method used to identify the TIDs by the high frequency backscatter sounding data is presented

and the technique to obtain the TIDs character parameters is established.Via analyzing the mutibeam-direction backscatter data

the variation character of group path and skip distance with the time and azimuth is researched.And the TIDs parameters including movement period

direction

wavelength

et cetera are obtained.Finally

the research of ionospheric fluctuating characteristic in large areas is achieved.