Raytheon Company

Frederick E Churchill

George W Ogar

Bernard J Thompson

Method and apparatus are disclosed for correcting amplitude and phase imbalances between the 'in phase' and 'quadrature' channels of a digital signal processor by determining a correction coefficient from a test signal periodically introduced into the quadrature phase detector of a radar system. The frequency spectrum of the signal at the output of the phase detector in response to each such test signal is utilized to produce a correction coefficient for application to radar return signals passing through the phase detector during normal radar operation, thereby providing true quadrature radar return signals for digital processing.

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Carlisle, MA, United States of America

Frederick E Churchill