Patent ID: 6392594
Filing Date: 2002-05-21
Classification: G01S

Abstract:
A radio wave receiving apparatus having an antenna for receiving radio waves and means for moving the pointing direction of an antenna beam of the antenna toward directions for improving resolution, said radio wave receiving apparatus comprising:means for effecting a Fourier transform in respect of azimuth of a received electric field signal obtained from the antenna while moving said antenna beam; means for effecting a Fourier transform in respect of azimuth of a received electric field pattern in the presence of one point source of wave of the antenna; means for dividing a signal resulting from the Fourier transform in respect of azimuth of said antenna received electric field signal by a signal resulting from the Fourier transform in respect of azimuth of said received electric field pattern in the presence of one point source of wave of the antenna; and a low-pass filter for subjecting the signal divided at the division means to a low-pass filtering in respect of azimuthal frequency; means for extracting exponential function components of the output signal of the low-pass filter; band extension means for extending said output signal of the low-pass filter into an azimuthal frequency region beyond the cut-off frequency of the low-pass filter by using the extracted exponential function components; and means for subjecting the signal extended by the band extension means to a Fourier inverse transform in respect of azimuth, the signal after said Fourier inverse transform being outputted as a final antenna output.