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Abstract

A radio wave receiving apparatus including a signal processing circuit which performs on Fourier transform with respect to an azimuth of an electric field signal outputted from an antenna receiving circuit. The Fourier transform is also performed with respect to an azimuth of the antenna pattern of an antenna. The Fourier transform signal derived from the electric field signal is then divided by the antenna pattern Fourier transform signal. A low-pass filter subjects the divided signal to low-pass filtering. The band of the output signal of the low-pass filter is extended into that beyond the cut-off frequency of the low-pass filter by using extrapolation. The band-extended signal is subjected to Fourier inverse transform with respect to azimuth, the signal after the Fourier inverse transform being outputted as a final antenna output. The antenna resolution thereof is improved by thus using a transfer function in the azimuthal frequency domain resulting from the Fourier transform with respect to azimuth of the antenna pattern.

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