Correction circuit for wide bandwidth antenna
AssigneeRaytheon Company
InventorFritz Steudel
Life of this patent
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Abstract
In a radar system employing an array antenna and microwave circuitry coupled thereto for developing sum and difference signals, a correction circuit utilizes the sum and difference signals for providing increased accuracy to elevation and azimuthal angle measurements of wide bandwidth radar signals. A correction is applied to the difference signal by subtracting therefrom a weighted time derivative of the sum channel, the weighting being proportional to the boresight error slope and the sines of the elevation and azimuth angles.
Claims4
In a monopulse radar system incorporating a phased array antenna and a microwave circuit coupled to said antenna for producing sum signals in a sum channel and difference signals in a difference channel to provide a measurement of the angle of orientation of a radar signal incident upon said antenna, a correction circuit coupled to said sum and difference channels for correcting said measurement from effects of a relatively wide bandwidth of said radar signal comprising:
- means for differentiating said sum signal with respect to time to provide a derivative thereof;
- means for weighting said derivative with a weighting factor proportional to the rate of change of said difference signal with respect to the orientation of said radar signal to provide a weighted derivative;
- and
- means for subtracting said weighted derivative from said difference signal to provide a corrected difference signal.
In a system for measuring the angle of orientation of a beam of radiation relative to a phased array antenna, said system providing a sum channel signal and a difference channel signal, a correction circuit comprising:
- means for differentiating said sum channel signal to provide a derivative thereof;
- means for multiplying said derivative by a factor representing the orientation of said beam and by a factor representing the magnitude of the boresight error slope of said phased array antenna to provide said weighted derivative;
- and
- means for subtracting said weighted derivative from said difference signal to provide a corrected difference signal.
Dependencies are inferred from the claim text.