Duochromatic indicator for a diversity polarization radar receiver

Claim 1

RADAR APPARATUS COMPRISING MEANS FOR RECEIVING RADAR ECHO PULSES OF MICROWAVE ENERGY, SAID MEANS INCLUDING MEANS HAVING TWO OUTPUT CHANNELS FOR DERIVING SEPARATE OUTPUT PULSES PROPORTIONAL IN AMPLITUDE RESPECTIVELY TO THE DIRECTLY-POLARIZED AND CROSS-POLARIZED COMPONENTS OF THE RECIEVED MICROWAVE ENERGY, A LIN-LOG AMPLIFIER COUPLED TO EACH OF THE RESPECTIVE OUTPUTS OF SAID MEANS, A SUBTRACTOR CIRCUIT COUPLED TO THE OUTPUTS OF THE LIN-LOG AMPLIFIERS FOR PRODUCING A SIGNAL PROPORTIONAL TO THE DIFFERENCE BETWEEN THE TWO LIN-LOG OUTPUTS, MEANS FOR ELIMINATING THE SIGNALS APPLIED TO THE SUBTRACTER MEANS HAVING AN AMPLITUDE BELOW A PREDETERMINED THERESHOLD LEVEL WHEREBY ONLY STRONG ECHO PULSES ARE UTILIZED, PHASE INVERTING MEANS COUPLED TO THE DIFFERENCE SIGNAL OUTPUT OF THE SUBTRACTER MEANS FOR PRODUCING TWO SIGNALS HAVING PULSES OF OPPOSITE SENSE, FIRST AND SECOND CLIPPING MEANS COUPLED TO THE RESPECTIVE OUTPUTS OF THE PHASE INVERTING MEANS, AMPLITUDE LIMITER MEANS COUPLED TO THE DIRECTLYPOLARIZED COMPONENT OUTPUT OF SAID RECEIVING MEANS, FIRST AND SECOND SUMMING MEANS COUPLED RESPECTIVELY TO THE OUTPUTS OF THE FIRST AND SECOND CLIPPING MEANS AND TO THE OUTPUT OF THE LIMITER MEANS, A PAIR OF CATHODE RAY INDICATOR TUBES HAVING DIFFERENT COLORED PHOSPHOR SCREENS, THE OUTPUT OF THE FIRST SUMMING MEANS BEING COUPLED TO THE INTENSITY CONTROL OF ONE INDICATOR TUBE AND THE OUTPUT OF THE SECOND SUMMING MEANS BEING COUPLED TO THE INTENSITY CONTROL OF THE SECOND INDICATOR TUBE, AND MEANS FOR SUPERIMPOSING THE IMAGES FORMED ON THE SCREEN OF THE TWO INDICATOR TUBES.