HF radar multi-frequency study on the interpretation f ACFs and the extraction of turbulent properties

摘要

To fit the autocorrelation function (ACF) of HF radar ionospheric backscattered signal to an analytical function, which is obtained theoreitically by introducing a Lagrangian description of turbulent meotion, can estimate directly the turbulent parameters of the scatters. in this paper, we sue this method to analyze the HF radar ACFs. A statistical study has been performed with the multi-frequency data, and shown that the statistical results are not same at the different frequency bands. We found that the influences of the limit radar time resolution and the received noise play the important roles to cause this inconsistency, both of them result in an additional expansion to the spectral width, and cause more Lorentzian behavior to ACFs; these tow limitations affect the form of ACFs more seriously in the higher frequency band, We verified this by a simple simulation.