The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2002
Filed:
Sep. 20, 1999
Toshihiro Sezai, Abiko, JP;
National Space Development Agency of Japan, Tokyo, JP;
Abstract
Provided herein is a radio wave receiving apparatus including a signal processing circuit comprising: a means for the Fourier transform in respect of azimuth of an electric field signal outputted from an antenna receiving circuit; a means for the Fourier transform in respect of azimuth of the antenna pattern of an antenna; a means for dividing the Fourier transform signal derived from the electric field signal by the antenna pattern Fourier transform signal; a low-pass filter for subjecting the divided signal to low-pass filtering; a means for extracting exponential function components of the output signal of the low-pass filter; a means for extending the band of the output signal of the low-pass filter beyond the cut-off frequency of the low-pass filter by using the exponential function components; and a means for subjecting the band-extended signal to Fourier inverse transform in respect of 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 in respect of azimuth of the antenna pattern.