Random modulation radar

Claim 1

IN A RADAR SYSTEM OF THE TYPE WHICH INCLUDES TRANSMITTING MEANS TO TRANSMIT RADAR SIGNALS TOWARD TARGETS AND RECEIVING MEANS TO RECEIVE SIGNALS RETURNED BY SAID TARGETS RESPONSIVE TO SIGNALS BEAMED THEREAT, THE COMBINATION COMPRISING: MEANS TO SELECT AT REGULAR INTERVALS AND AT RANDOM, THE PHASE ANGLE OF THE TRANSIMTTED RADAR SIGNALS SO AS TO TRANSMIT AS RADAR PULSES A SERIES OF SUCCESSIVE ADJACENT SHORT PULSES OF THE SAME DURATION BUT OF DIFFERENT PHASE ANGLES CHANGING FROM ONE PULSE TO THE NEXT ONE OR NOT AT RANDOM, SAID MEANS TO SELECT COMPRISING AT THE TRANSMITTER A GENERATOR GENERATING AT LEAST TWO PERIODIC VOLTAGES OF THE SAME FREQUENCY BUT DIFFERING FROM EACH OTHER BY A FIXED PHASE ANGLE; FIRST SELECTOR SWITCH MEANS; RANDOM SELECTION MEANS OPERATE SAID FIRST SELECTOR SWITCH MEANS, SAID FIRST SWITCH MEANS SELECTING AT RANDOM UNDER THE CONTROL OF SAID RANDOM SELECTION MEANS BETWEEN SAID VOLTAGES AND APPLYING THE SELECTED VOLTAGE TO SAID TRANSMITTING MEANS WHEREIN THE CARRIER FREQUENCY OF THE TRANSMITTER IS ESTABLISHED AS A SERIES OF SHORT RADAR PULSES WITH A PHASE ANGLE CHANGING FROM ONE TO THE NEXT OR NOT AT RANDOM;