Patent ID: 6204809
Filing Date: 2001-03-20
Classification: G01S

Abstract:
A radio wave receiving apparatus having an antenna for receiving radio wave 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 with respect to azimuth of a received electric field signal obtained from the antenna while moving said antenna beam;means for effecting a Fourier transform with respect to azimuth of a received electric field pattern of the antenna in the presence of one point wave source;means for dividing a signal resulting from the Fourier transform with respect to azimuth of said antenna received electric field signal by a signal resulting from the Fourier transform with respect to azimuth of said received electric field pattern of the antenna in the presence of one point wave source;a low-pass filter for subjecting the signal divided at the division means to a low-pass filtering with respect to an azimuthal frequency;band extention means for extending the output signal of the low-pass filter into a azimuthal frequency region beyond the cut-off of the low-pass filter by using extrapolation; andmeans for subjecting the signal extended by the band extention means to a Fourier inverse transform with respect to azimuth,the signal after being subjected to said Fourier inverse transform being outputted as a final antenna output.