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Radar beacon receiver for positionmodulated pulse signals

阅读:645发布:2023-10-23

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1. IN A PULSE-GROUP SIGNALLING SYSTEM UTILIZING PULSE GROUPS WIDELY SPACED IN TIME, EACH PULSE GROUP COMPRISING A PLURALITY OF IDENTICAL PULSES SPACED RELATIVELY CLOSE IN TIME; A RECEIVER COMPRISING MEANS INCLUDING A SHAPER CIRCUIT FOR DEVELOPING A SEQUENCE OF SQUARE WAVE PULSES FROM AND CORRESPONDING IN TIMING TO THE SEVERAL INDIVIDUAL PULSES OF A RECEIVED PULSE GROUP, AND A DECODING CIRCUIT ENERGIZED BY SAID SHAPER CIRCUIT FOR DEVELOPING A DECODED PULSE WHEN THE TIME INTERVAL BETWEEN THE FIRST PAIR OF SQUARE WAVE PULSES OF A GROUP IS EQUAL TO A PRESELECTED CODE INTERVAL; SAID DECODING CIRCUIT COMPRISING MEANS ENERGIZED BY SAID SHAPER CIRCUIT AND INCLUDING A DELAY LINE FOR DEVELOPING AN ECHO PULSE AT A PREDETERMINED TIME INTERVAL FOLLOWING THE FIRST SQUARE WAVE PULSE OF SAID PAIR, WIPER MEANS RENDERING SAID DECODING CIRCUIT INOPERATIVE TO DEVELOP ECHO PULSES FROM THOSE SQUARE WAVE PULSES OF ANY GROUP SUBSEQUENT TO THE FIRST PULSE THEREOF AND MEANS RESPONSIVE TO A COINCIDENCE OF SAID ECHO PULSE
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