A theoretical model of the sky-wave path propagation with frequency modulated continuous wave (FMCW) source for high\nfrequency (HF) radar is proposed in this paper. Based on themodeling of pulsed source, the expression of the received electric field\nwith anFMCWsource is derived for the reflection case fromthe ionospheric irregularities. Subsequently, the ionospheric reflection\ncoefficient with different phase power spectrums for vertical and oblique backscattering propagation paths is incorporated into the\nionospheric cluttermodel. Simulation results show that the peak power of FMCWin average is lower than that of pulsed waveform.\nFurthermore, different incident angles andmagnetic field inmid-latitude can also influence the power density of the backscattering\nionospheric clutter. Finally, the data analysis results fromthe high frequency surface wave radar (HFSWR) and Ionosonde collected\nin Yellow Sea preliminarily verify the inversion of the variance of the electron density fluctuation and the vertical drift velocity of\nthe irregularities within ionosphere.
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