Missile glide path maintained constant by the use of static and pitot-head pressures

Claim 1

A MISSILE CONTROL SYSTEM FOR CONTROLLING THE DESCENT PATH OF A GLIDING MISSILE, SO AS TO MAINTAIN A PREDETERMINED SUBSTANTIALLY CONSTANT GLIDE ANGLE, INCLUDING CONTROL SURFACE ACTUATING MEANS, MEANS FOR MEASURING STATIC AND PITOT-HEAD PRESSURES, AND MEANS OPERATIVELY CONNECTED TO SAID MEASURING MEANS AND SAID ACTUATING MEANS AND RESPONSIVE TO THE DIFFERENCE BETWEEN A GIVEN VALUE OF DYNAMIC HEAD AND THE ACTUAL DYNAMIC HEAD OBTAINED BY SUBTRACTING THE STATIC PRESSURE FROM THE PITOT-HEAD PRESSURE TO OPERATE SAID ACTUATING MEANS IN SUCH A MANNER AS TO TEND TO ELIMINATE THE SAID DIFFERENCE AND THEREBY TO RESTORE THE DESCENT PATH TO THE PREDETERMINED GLIDE ANGLE, A FIRST STORE FOR RECEIVING AT LEAST ONE GIVEN VALUE OF DYNAMIC HEAD BEFORE LAUNCHING OF THE MISSILE, AND IN WHICH THE MEANS RESPONSIVE TO SAID DIFFERENCE INCLUDES A FIRST DIFFERENCING CIRCUIT CONNECTED TO SAID MEASURING MEANS FOR RECEIVING ELECTRICAL SIGNALS REPRESENTING THE PITOT-HEAD AND STATIC PRESSURES, AND A SECOND DIFFERENCING CIRCUIT CONNECTED TO THE OUTPUT OF THE FIRST DIFFERENCING CIRCUIT AND TO THE FIRST STORE TO RECEIVE THEREFROM A SIGNAL REPRESENTING A STORED VALUE OF DYNAMIC HEAD, SAID SECOND DIFFERENCING CIRCUIT HAVING ITS OUTPUT CONNECTED TO SAID ACTUATING MEANS, A SECOND STORE FOR RECEIVING AN ALTITUDE VALUE REPRESENTING THE MINIMUM ALTITUDE FOR CONTROL OF THE MISSILE BY DYNAMIC HEAD, A THIRD DIFFERENCING CIRCUIT CONNECTED TO THE SECOND STORE AND RECEIVING THEREFROM AN INPUT REPRESENTING THE STORED ALTITUDE SIGNAL AND CONNECTED TO SAID MEASURING MEANS FOR RECEIVING THEREFROM A SIGNAL REPRESENTING THE MISSILE ALTITUDE, AND MEANS CONNECTED TO SAID SECOND DIFFERENCING CIRCUIT FOR SWITCHING THE CONTROL OF THE FLIGHT PATH ADJUSTING MEANS FROM THE SECOND DIFFERENCING CIRCUIT TO THE THIRD DIFFERENCING CIRCUIT WHEN THE OUTPUT OF THE SECOND DIFFERENCING CIRCUIT IS LESS THAN A GIVEN VALUE.