Method for estimating gain and phase imbalance using self-calibrating monopulse angle discriminants in a monopulse radar system
AssigneeRaytheon Company
InventorKwang M. Cho
Life of this patent
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Abstract
A processing method or algorithm is for use with a monopulse radar system that provides accurate position information in a cross-range direction for ground moving targets detected using the monopulse radar system. The method corrects the phase of each detected moving target on an individual basis, and thus more accurately compensates for the phase error introduced into each target in a random fashion as a result of noise. The direction of angle correction is determined from clutter data. A gain correction factor includes a term for antenna effects to provide for a more accurate gain correction factor calculation.
Claims6
A method for use with a monopulse radar system that provides position information in a cross-range direction for ground moving targets detected using the monopulse radar system, comprising the steps of:
- range compressing target data generated by a ground mapping monopulse radar system;
- processing the range compressed target data using a Doppler fast Fourier transform;
- determining the direction of angle correction from clutter data;
- detecting a target;
- determining conjugate products for the detected target from the sum and difference channel data;
- determining the phase angle of the target by processing the target and clutter data;
- and
- estimating the azimuth cone angle of the target by the angle discriminant function.
Dependencies are inferred from the claim text.