Title :
Frequency estimation of travelling ionospheric disturbances
Author :
O´Keefe, J.M. ; Campbell, D.A. ; Cahill, L.W.
Author_Institution :
Sch. of Electron. Eng., La Trobe Univ., Vic., Australia
Abstract :
The use of adaptive filters in estimating the instantaneous frequency of Doppler shifted signals reflected from the ionosphere is addressed in this paper. With the aid of a software simulator, it has been shown that an adaptive linear predictor is effective in extracting the required Doppler shift. Analysis of such signals provides information on velocity fluctuations that arise from travelling ionospheric disturbances and is important when trying to link a disturbance with its source. Spectral analysis of the Doppler itself can provide additional information about a disturbance and limitations in the performance of Fourier transforms in this application are highlighted
Keywords :
Doppler shift; adaptive filters; digital simulation; frequency estimation; geophysical signal processing; ionospheric disturbances; spectral analysis; Doppler shifted signals; Fourier transforms; adaptive filters; adaptive linear predictor; frequency estimation; instantaneous frequency; software simulator; spectral analysis; travelling ionospheric disturbances; velocity fluctuations; Adaptive filters; Data mining; Doppler shift; Fluctuations; Frequency estimation; Information analysis; Ionosphere; Predictive models; Signal analysis; Spectral analysis;
Conference_Titel :
Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3073-0
DOI :
10.1109/ISCAS.1996.541790
