Television tracking error detector

Claim 1

IN A SYSTEM FOR DETERMINING THE AZIMUTHAL CHARACTERISTIC OF A TARGET IN A FIELD OF VIEW WITH RESPECT TO ONE BOUNDARY OF SUCH FIELD, THE COMBINATION OF: A TELEVISION CATHODE-RAY CAMERA TUBE HAVING A PHOTOSENSITIVE SCREEN; OPTICAL MEANS FOR FOCUSING SAID FIELD OF VIEW ONTO THE SCREEN OF SAID CAMERA TUBE; A VERTICAL DEFLECTION GENERATOR PRODUCING A SERIES OF OUTPUT PULSES AT THE FIELD-SCANNING RATE OF THE ELECTRON BEAM OF SAID CATHODE-RAY CAMERA TUBE; A HORIZONTAL DEFLECTION GENERATOR FOR DEVELOPING A SERIES OF OUTPUT PULSES TO CONTROL THE DEFLECTION OF THE ELECTRON BEAM OF SAID CAMERA TUBE AT LINE-SCANNING FREQUENCY; A VIDEO OUTPUT CIRCUIT FROM SAID CAMERA TUBE IN WHICH THE SAID TARGET IMAGE APPEARS AS A PULSE PRODUCED WHEN THE ELECTRON BEAM IMPINGES THAT PARTICULAR PORTION OF THE PHOTOSENSITIVE SCREEN ON WHICH THE IMAGE OF SAID TARGET APPEARS; MEANS FOR DIFFERENTIATING THE SAID TARGET PULSE TO OBTAIN THEREFROM A PULSE HAVING A STEEPLY-RISING LEADING EDGE; A FIRST FLIP-FLOP NETWORK HAVING TWO STEADY-STATE CONDITIONS, SAID NETWORK BEING INITIALLY IN ONE OF SUCH CONDITIONS; A CIRCUIT FOR APPLYING THE DIFFERENTIATED TARGET PULSE TO SAID FIRST FLIP-FLOP NETWORK TO CAUSE THE LATTER TO ATTAIN THE OTHER OF ITS STEADY-STATE CONDITIONS AND THEREBY DEVELOP IN THE OUTPUT THEREOF A RECTANGULAR PULSE THE LEADING EDGE OF WHICH IS DEVELOPED UPON THE CHANGE OF SAID FLIP-FLOP NETWORK TO ITS SAID OTHER CONDITION; A SECOND FLIP-FLOP NETWORK LIKEWISSE HAVING TWO STEADYSTATE CONDITIONS AND BEING PLACED IN ONE OF SUCH CONDITIONS UPON THE RECEPTION THEREBY OF THE LEADING EDGE OF THE RECTANGULAR PULSE OUTPUT OF SAID FIRST FLIP-FLOP NETWORK; A TRIGGERED OSCILLATOR OPERATING AT A PREDETERMINED FREQUENCY; A CONNECTION FOR APPLYING THE OUTPUT OF SAID SECOND FLIP-FLOP NETWORK TO SAID OSCILLATOR TO INITIATE THE OPERATION THEREOF WHEN SAID SECOND FLIP-FLOP NETWORK ATTAINS ITS SAID ONE CONDITION, SAID OSCILLATOR PRODUCING IN THE OUTPUT THEREOF A SERIES OF REGULARLYRECURRING DATA PULSES AT THE SAID PREDETERMINED FREQUENCY;