Pulse stretching and compression methods and systems

Claim 1

A RADAR COMPRISING: MEANS FOR GENERATING SHORT A.-C. PULSE; A BANDPASS FILTER COUPLED TO SAID GENERATING MEANS FOR FILTERING SAID PULSES; A DISPERSIVE FILTER ADAPTED FOR STRETCHING THE OUTPUT PULSES OF SAID BANDPASS FILTER; STORING MEANS CAPABLE FOR RECORDING INFORMATION IN A FIRST DIRECTION AND RESTITUTING THE RECORDED INFORMATION IN A SECOND DIRECTION, OPPOSITE TO SAID FIRST DIRECTION, SAID STORING MEANS HAVING AN INPUT AND AN OUTPUT; A TRNSMITTER, INCLUDING AMPLIFYING MEANS AND FREQUENCY TRANSLATING MEANS, COUPLED TO SAID STORING MEANS OUTPUT; AN AERIAL COUPLED TO SAID TRANSMITTER FOR TRANSMITTING PULSES AND RECEIVING ECHO PULSE; A RECEIVER COUPLED TO SAID AERIAL AND INCLUDING AMPLIFYING AND FREQUENCY TRANSLATING MEANS; A DETECTOR AND INDICATOR MEANS COUPLED IN SERIES AND MEANS FOR SELECTIVELY COUPLING SAID DISPERSIVE FILTER (A) BETWEEN SAID BANDPASS FILTER AND SAID STORING MEANS INPUT AND (B) BETWEEN SAID RECEIVER AND SAID DETECTOR.