Communications: directive radio wave systems and devices (e.g. – With particular circuit – Digital processing
Patent
1999-03-19
2000-12-19
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Digital processing
342 25, G01S 1300
Patent
active
061632937
ABSTRACT:
A radio wave receiving apparatus including having improved antenna resolution. The apparatus includes a signal processing circuit; a circuit for performing the Fourier transform with respect to an azimuth of an electric field signal outputted from an antenna receiving circuit; a circuit for performing the Fourier transform with respect to an azimuth of the antenna pattern of an antenna; a circuit for dividing the Fourier transform signal resulting from the electric field signal by the antenna pattern Fourier transform signal; and a circuit for passing the divided signal through a low-pass filter in respect of azimuthal frequency and then subjecting it to a Fourier inverse transform in respect of azimuth, so as to output the signal after the Fourier inverse transform as a final antenna output, thereby improving the antenna resolution by using a transfer function in the azimuthal frequency domain resulting from the Fourier transform of the antenna pattern with respect to an azimuth.
REFERENCES:
patent: 4617570 (1986-10-01), Gutleber
patent: 5532699 (1996-07-01), Smith
patent: 5608404 (1997-03-01), Burns et al.
patent: 5943006 (1999-08-01), Crane et al.
Copy of European Patent Office Communication for European Patent Application No. 99302116, including European Search Report dated Dec. 21, 1999.
Mull Fred H.
National Space Development Agency of Japan
Tarcza Thomas H.
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