Radar systems

Claim 1

A RADAR SET COMPRISING MEANS FOR SCANNING SPACE WITH PERIODIC RATIO PULSES TO DERIVE ECHOES FROM TARGETS WITHIN SAID SPACE, A RECEIVER FOR RECEIVING SAID ECHOES, A FIRST DISPLAY SCREEN PORTION, MEANS RESPONSIVE TO SAID RECEIVER FOR DISPLAYING ON SAID FIRST DISPLAY SCREEN PORTION ECHO SIGNALS FROM SAID TARGETS IN POSITIONS HAVING BEARING IN RELATION TO THE ORIGIN OF THE DISPLAY AND HAVING DISTANCES FROM SAID ORIGIN CORRESPONDING RESPECTIVELY TO THE BEARINGS AND RANGES OF THE TARGETS FROM WHICH SAID ECHOES ARE RECEIVED, A SECOND DISPLAY SCREEN PORTION, MEANS COMPRISING AN ELECTRON BEAM AND RESPONSIVE TO SAID RECEIVER FOR DISPLAYING ON SAID SECOND DISPLAY SCREEN PORTION ECHO SIGNALS FROM TARGETS WITHIN A RELATIVELY SMALL PORTION OF THE CONVERAGE OF SAID RADAR SET, FIRST TIMEBASE MEANS FOR DEFLECTING SAID ELECTRON BEAM IN ONE COORDINATE DIRECTION OF A PLANAR COORDINATE SYSTEM, MEANS ACTUATED AT THE REPETITION FREQUENCY OF SAID RADIO PULSES AND INCLUDING AN ADJUSTABLE TIME DELAY FOR ACTUATING SAID TIME-BASE MEANS, SECOND TIME-BASE MEANS FOR DEFLECTING SAID ELECTRON BEAM IN THE OTHER COORDINATE DIRECTION OF SAID COORDINATE SYSTEM, ACTUATING MEANS ACTUATED AT THE BEARING REPETITION FREQUENCY OF THE SCANNING PERFORMED BY SAID RADIO PULSES AND AT AN ADJUSTABLE PHASE RELATION THERETO FOR ACTUATING SAID SECOND TIME-BASE MEANS, MEANS FOR PRODUCING RANGE PULSES OF PREDETERMINED LENGTH SIMULTANEOUSLY WITH ACTUATION OF SAID FIRST TIME-BASE MEANS, MEANS FOR PRODUCING BEARING PULSES OF PREDETERMINED LENGTH SIMULTANEOUSLY WITH ACTUATION OF SAID SECOND TIMEBASE MEANS, MEANS FOR SELECTING CERTAIN ONES OF SAID BEARING PULSES, GATING MEANS FOR GIVING AN OUTPUT WHEN COINCIDENCE EXITS BETWEEN THE SELECTED BEARING PULSES AND THE RANGE PULSES, AND MODULATING MEANS FOR MODULATING SAID ELECTRON BEAM IN ACCORDANCE WITH THE OUTPUT FROM THE GATING MEANS AND WITH THE VIDEO SIGNALS FROM THE RECEIVER, THE EXTENT OF SAID RELATIVELY SMALL PORTION BEING DETERMINED IN THE RANGE BY THE LENGTH OF THE RANGE PULSES AND IN BEARING BY THE LENGTH OF THE BEARING PULSES, THE POSITION OF THE RELATIVELY SMALL PORTION BEING DETERMINED RADIALLY BY THE ADJUSTMENT OF SAID TIME DELAY AND CIRCUMFERENTIALLY BY THE ADJUSTMENT OF SAID PHASE RELATION PRODUCED BY SAID ACTUATING MEANS.