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12 m results 24 August accurately approximately August results autocorrelation function average background noise backscattering bandlimited bandwidth Beckmann chirp circular polarization complex envelope computed cross-polarized curve data window depolarized component depolarized to expected doppler shift echo components electron content elevation angle ESTIMATES FROM RUN Evans and Hagfors expected and depolarized expected component Faraday effect Faraday modulation Faraday rotation filter frequency FREQUENCY SYNTHESIZER FREQUENCY-TIME TRACKS group delay hanning windows high resolution ionosphere leading edge libration linear linearly polarized low resolution measured moon moon's normalized null Nyquist rate P(nAf periodogram phase error power spectral pulse length quasi-specular component radar cross section range depth range interval range resolution ratio receiver output signal refraction response run of 24 sampling scattering behavior short-pulse shown in Fig sidelobe spectral analysis spectral window spectrum subradar point target term total radar cross values wave wavelength