论文信息 - Modified Methods of Estimating Space-Time Spectra from Polar-Orbiting Satellite Data Part I : The Frequency Transform Method

Modified Methods of Estimating Space-Time Spectra from Polar-Orbiting Satellite Data Part I : The Frequency Transform Method

A simplification is made of the nonorthogonal Fourier transform method (Salby, 1982) for estimating space-time spectra from uneven twice-daily data sampled by a polar-orbiting satellite. The modified method transforms frequency only by the use of the Galilean transformation, while Salby's method transforms both frequency and wavenumber. Space-time spectra are obtained from the time-Fourier transform with respect to the Doppler-shifted frequency as viewed from the satellite. They wavenumber-frequency aliasing characteristics are examined and the computer code is exemplified.

Y. Hayashi

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